Formic acid (ch2o2) on reaction with water undergoes dissociation reaction.
Formic acid is the acid released by ant when it bites which causes us irritation.
It's formula is CH2O2 or HCOOH. and pH is 3.75.
In the case of dehydration, one hydrogen atom in the water molecule joins the hydroxyl group in the trans formic acid to form a new water molecule, while the hydrogen bonded to carbon in the acid breaks off to regenerate a water molecule.
Formic acid dissociates in water according to the equation:
HCOOH (aq) + H2O (l) = H3O + (aq) + HCOO- (aq)
Formic acid is the simplest carboxylic acid, containing a single carbon. Occurs naturally in various sources including the venom of bee and ant stings, and is a useful organic synthetic reagent. Principally used as a preservative and antibacterial agent in livestock feed.
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How many moles are in 18.8 grams of NaOH
Serotonin acts as a weak base and has a pkb = 3. 84. what is the ph of a solution made by adding 0. 025 m of serotonin in water?
Serotonin acts as a weak base and has a pkb = 3. 84. The ph of a solution made by adding 0. 025 m of serotonin in water is 2.4.
A molecule called serotonin delivers information between nerve cells in the brain and other parts of the body. Body processes like mood, sleep, digestion, nausea, wound healing, bone health, blood clotting, and sexual desire are all significantly influenced by serotonin.
Tryptophan, an important amino acid, is used to make serotonin. This amino acid, which must be ingested by food, is frequently present in foods including nuts, cheese, and red meat. Lower amounts of serotonin can result from tryptophan insufficiency. Anxiety or depression may come from this, among other mood disorders. The chemical serotonin is essential for elevating mood and lowering anxiety.
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What is the multiplicity of the indicated carbon in an off-resonance decoupled c-13 nmr spectrum?
Tert-butyl alcohol's 13C-NMR spectrum will only display two signals.
(I) Signal at about 31 ppm: This signal is for the more shielded and electron-rich carbon atoms and is upfield. The height of the peak on the y-axis indicates the relative quantity of carbon atoms to other peaks. Since it is three times as tall as the second signal in this instance, it is clear that this peak represents three carbon atoms.
(ii) Signal at about 70 ppm: This signal is directed downfield and pertains to the carbon atom, which is more exposed and has an environment poor in electrons. The height of these peaks is only one carbon higher than the second signal. Furthermore, the exposed environment demonstrates this carbon.
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A compound composed of 3. 3% h, 19. 3% c, and 77. 4% o has a molar mass of approximately 60 g/mol. What is the molecular formula of the compound?.
The molecular of the compound will be-(H₂CO₃)1= H₂CO₃
The given molecule has the molecular formula H2CO3, also known as Carbonic acid.
Given that-
Consequently,
H= 3.3%.
C=19.3%
O =77.4%
Number of H moles = 3.3/1 = 3.3
Number of C moles = 19.3/12 = 1.60
Number of O moles = 77.4/16 = 4.83
As a result, the ratio of C, H, and O atoms is 3.3: 1.60: 4.83.
Divide by the amount you obtain that is the smallest: 3.3/1.60; 1.60/1.60; 4.83/1.60 = 2: 1: 3
H2CO3 is the empirical formula.
Let (H2CO3)n be the molecular formula.
A molecular formula is a chemical formula that specifies how many atoms of each element there are in each molecule of a given substance.
Molar mass thus equals (21+112+3X16)n = 62n.
As per the inquiry, 62n = 60
alternatively, n= 0.96 (round figure is 1)
Therefore, carbonic acid is the chemical whose molecular formula is (H2CO3)1=H2CO3.
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If the sodium oxide (Na2O) in soda-lime glass was replaced by potassium oxide (K2O), this would result in . . .
When carbon bonds with oxygen, what is formed? when carbon bonds with oxygen, is formed.
The correct answer is Carbon Dioxide.
What are carbon bonds?Because each carbon is identical, they all contain four valence electrons, so they can easily bond with different carbon atoms to form extended chains or rings. A carbon atom can bond with another carbon atom two or three times to create double and triple covalent adhesives between two carbon atoms.The partial payments on the fluorine and carbon are beautiful, contributing to the unusual bond power of the carbon-fluorine bond. The bond is marked as "the strongest in organic chemistry," because fluorine forms the strongest single bond to carbon.In chemistry, a covalent bond is the strongest bond. In such bonding, every two atoms transfer electrons that bind them concurrently. For example, water molecules are bonded jointly where both hydrogen atoms and oxygen atoms transfer electrons to form a covalent bond.
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what is the freezing point, in C, of a 2.75 m solution of C8H18 in benzene?
The freezing point of benzene is 14.08°C.
What is freezing point?The temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure.
Calculation
The equation which give relation between freezing point depletion and molality is,
[tex]\Delta T_{f} = K_{f} \times m[/tex]
where,
[tex]\Delta T_{f}[/tex] = change in the freezing point of the solvent.
[tex]K_{f}[/tex] of benzene = 5.12°C/m (given)
M is molality of the solution = 2.75 M
Now, after putting the value in above formula we get
[tex]\Delta T_{f} = K_{f} \times m[/tex]
[tex]\Delta T_{f} = 5.12 \times 2.75[/tex]
= 14.08°C
Thus from the above conclusion we can say that The freezing point of benzene is 14.08°C.
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Answer:
-8.58
Okay, im having trouble with the question too and the answer i types was wrong, so i went to omnicalculator instead and got this answer which was right. :')
Choose the chemical equation that is correctly balanced. 2ca(s) cl2(g) → cacl2(s) 4mg(s) o2(g) → 2mgo(s) li(s) cl2(g) → 2licl(s) c(s) o2(g) → co2(g)
HELP PLS I WILL MARK U BRAINLIEST!
Answer: Calcium Hydroxide
Explanation:
CaOH will as it is the only base, the rest is acid
Dsm-5 includes gambling disorder as an addictive disorder, along with substance use disorders. this change is considered important because it:_________
Dsm-5 includes gambling disorder as an addictive disorder, along with substance use disorders. This change is considered important because it suggest that people may become addicted to behavior net just substance.
What is Gambling ?Gambling disorder which involve repeated, problem gambling behavior. The behavior leads to problem for the individual families, and society.
The emotional and physical sign of gambling disorder are:
Anxiousness and DepressionHopelessnessLack of sleepPallor to skinGain loss of weightWhat are the effects of gambling disorder ?Gambling disorder make another kind of addiction that an individual uses to be able to deal with the situation. Start using the drugs alcohol to reduce the feeling of anxiety.
Thus from the above conclusion we can say that Dsm-5 includes gambling disorder as an addictive disorder, along with substance use disorders. This change is considered important because it suggest that people may become addicted to behavior net just substance.
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If another hydrogen of c2h5cl is replaced by a chlorine atom to yield c2h4cl2, how many isomers would result?
One isomer is formed
1,1- Dichloroethane is the isomer.
If another hydrogen of c2h5cl is replaced by a chlorine atom to yield c2h4cl2, it would result in one isomer.
In contrast to 1,2-dichloroethane, which has two chlorine atoms connected to distinct carbon atoms, 1,1-dichloroethane has two chlorine atoms bound to the same carbon atom.Isomers are each of two or more compounds having the same formula but various atom arrangements in the molecule and unique characteristics.What three types of isomers are there?Chain isomersFunctional group isomersPositional isomers
These are the three different categories of structural isomers.
How is an isomer recognized?Their bonding patterns and the way they occupy three-dimensional space can be used to distinguish them. Determine the bonding patterns of structural (constitutional) isomers. Although the atoms in the compounds are the same, their connections create various functional groups.What makes isomers significant?Because two isomers might have the same chemical formula but different chemical structures, they are significant. The molecule's properties are influenced by its structure.To learn more about isomers visit:
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What set of reaction conditions would favor an sn2 reaction on 2-bromo-3-methylbutane?
The set of reaction conditions would favor a sn2 reaction on 2-bromo-3-methylbutane is a strong nucleophile in an aprotic solvent. The correct option is D.
What is Sn2 reactions?It is a type of nucleophilic substitution reaction. This mechanism is common in organic chemistry. In these reactions, one bond is break and one bond is formed simultaneously.
The sn2 is a nucleophile reaction, and it is a strong nucleophile. This type of reaction, will occur in the compounds in which there is one alkyl halide group and a good leaving group.
In 2-bromo-3-methylbutane, there is a bromine and methyl group both, so the favor would be a strong nucleophile in an aprotic solvent.
Thus, the correct option is D) strong nucleophile in an aprotic solvent.
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The question is incomplete. Your complete question is given below:
A) weak nucleophile in a protic solvent
B) weak nucleophile in an aprotic solvent
C) strong nucleophile in a protic solvent
D) strong nucleophile in an aprotic solvent
E) none of the above
1. One of the uses of methanol, CH3OH (also known as methyl alcohol, wood alcohol and
methyl hydrate), in diluted form is windshield washer antifreeze. In pure form methanol has
a molar concentration of 24.7 mol/L. Using a table from the CRC Handbook of Chemistry
and Physics, a student prepared 8.0 L of 10.0 mol/L aqueous methanol as windshield washer
-30°C. What volume of methanol was necessary to prepare the
antifreeze good for
antifreeze solution?
The volume of methanol necessary to prepare the antifreeze good for antifreeze solution is 3.2 L
Dilution formulaM₁V₁ = M₂V₂
Where
M₁ is the molarity of stock solution V₁ is the volume of stock solution M₂ is the molarity of diluted solution V₂ is the volume of diluted solution Data obtained from the question Molarity of stock solution (M₁) = 24.7 mol/LVolume of diluted solution (V₂) = 8 LMolarity of diluted solution (M₂) = 10 mol/L Volume of stock solution needed (V₁) = ?How to determine the volume neededThe volume of the methanol necessary to prepare the solution can be obtained as illustrated below:
M₁V₁ = M₂V₂
24.7 × V₁ = 10 × 8
24.7 × V₁= 80
Divide both side by 24.7
V₁ = 80 / 24.7
V₁ = 3.2 L
Thus, the volume of methanol necessary to prepare the antifreeze good for antifreeze solution is 3.2 L
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Calculate the concentration of clo2− at equilibrium if the initial concentration of hclo2 is 2. 25×10^−2 m.
The concentration of ClO₂⁻ at equilibrium if the initial concentration of HClO₂ is 0.0654.
What is concentration?The concentration of any substance is the quantity of that substance in per square of the space or container.
The reaction is
HClO₂ + H₂O <=> H₃O⁺ + ClO₂⁻
The pH is 0.454 M
Ka = [H₃O⁺][ClO₂⁻ ] / [HClO₂]
2. 25 × 10⁻² m = [x][x] / 0.454-x]
2 + 0.011 - 0.004994 = 0
solve the quadratic equation
x = 0.0654 = [H3O+] = [ClO2-]
pH = -log (H3O+)
pH = -log(0.0654)
pH = 1.2
equilibrium concentrations of
[HClO2] = 0.454 -x = 0.454 -0.0654 = 0.3886 M
[ClO2- ] = x = 0.0654
Thus, the equilibrium concentrations is 0.0654.
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help me with this question please like right now
Using the gas laws, the volume of nitrogen produced is 6.6 L.
What is the product of a reaction?We know that the product of a reaction is obtained from the balanced reaction equation. The reactants combine together to yield the products hence we have; N2 + 3H2 ----> 2NH3
We know that 1 mole of hydrogen occupies 22.4 L
x moles of hydrogen occupies 25500 L
x = 1 mole * 25500 L/ 22.4 L
x = 1138.4 moles
If 3 mole of hydrogen reacts with 1 mole of nitrogen
1138.4 moles reacts with 1138.4 moles * 1 mole/ 3 moles = 379.5 moles
Mass of nitrogen = 379.5 moles * 28 g/mol = 10626 g
Now 3 moles of hydrogen produces 44.8 L of NH3
1138.4 moles produces 1138.4 moles * 44.8 L/ 3 moles = 17000 L
Now;
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V2 = P1V1T2/P2T1
V2 = 1 * 17000 * 848/5.5 * 273
V2 =9601 L
2) 2NH4NNO3(s) ---> 4H2O(g) + 2N2(g) + O2(g)
Number of moles = 12g/ 80 g/mol = 0.15 moles
Now;
2 moles of NH4NNO3 produced 2 moles of nitrogen hence 0.15 moles of N2 was produced.
1 mole of N2 occupies 22.4 L
0.15 moles of N2 occupies 0.15 moles * 22.4 L/1 mole = 3.36 L
P1 = 760 torr
V1 = 3.36 L
T1 = 273 K
P2 = 745 torr
T2 = 527 degrees or 800 K
V2 = ?
V2 = P1V1T2/P2T1
V2 = 760 * 3.36 * 527/745 * 273
V2 = 6.6 L
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0. 34 ll of hno3hno3 is titrated to equivalence using 0. 14 ll of 0. 1 mnaohmnaoh. what is the concentration of the hno3hno3 ?
When 0.34 of HNO₃ is titrated to equivalence using 0.14 l of 0.1 m NaOH then the concentration of HNO₃ is 0.041 M
The reaction of neutralization of HNO₃ with NaOH is
HNO₃ + NaOH → H₂O + NaNo₃
When 1 mole of HNO₃ react with 1 mole of NaOH, based on chemical rection the moles of NaOH at equivalence point are equal to moles of HNO₃ present in solution: -
With the mole and volumes, we can find molarity as follows:
Moles of NaOH = moles HNO₃
⁼ 0.14 L X (0.1 mol NaOH/L) = 0.014 mole NaOH
=0.014 mol HNO₃
Molarity: -
[tex]\frac{(Mole of HNO₃)}{(volume of HNO₃)}= \frac{0.014}{0.34}[/tex]
= 0.041 M
Thus, from above solution we concluded that the concentration of HNO₃ solution is 0.041 M.
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Calculate the molality of a solution containing 14. 3 g of nacl in 42. 2 g of water
Answer:
5.80 M
Explanation:
In this problem, the solute is NaCl and the solvent is water. To find the molality, you need to (1) convert grams NaCl to moles NaCl (via molar mass), then (2) convert grams H₂O to kilograms H₂O, and then (3) calculate the molality (via molality equation). The final answer should have 3 sig figs to match the sig figs of the given values.
(Step 1)
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
14.3 grams NaCl 1 mole
-------------------------- x ------------------------ = 0.245 moles NaCl
58.443 grams
(Step 2)
1,000 g = 1 kg
42.2 grams H₂O 1 kg
-------------------------- x ----------------------- = 0.0422 kg H₂O
1,000 grams
(Step 3)
Molality = moles solute / mass solvent (kg)
Molality = 0.245 moles NaCl / 0.0422 kg H₂O
Molality = 5.80 M
How do I find last significant figure. Please give a thorough explanation because I do not understand this (40 points)
Use 46.7350 as example
Answer:
Below I have listed a write up that helped me!
Explanation:
Here are some general rules regarding significant figures (or sigfigs!)
1) any number that is not a 0 is always a sigfig. In your example, the significant figures would be 4, 6, 7,3,5 and *0. (*there are special rules regarding the number 0)
2) If a 0 is between two non-zero digits (sigfigs), it will be a significant figure. For example, in the number 305, the 0 between the 3 and 5 would be considered a significant figure.
3) 0's that "lead", or are to the left of significant figures are NOT significant figures. For example, in the number 0.002, there would be only one significant figure, which is the 2.
4) 0's that "trail", or are to the right of a significant figure behind a decimal place, are significant figures. For example, in the number 3.1250, the 0 at the end would be considered significant. There are five sigfigs total in this number. The trailing 0 in your example would be significant!
5) However, regarding the rule above, if the number DOES NOT have a decimal place and has trailing 0's, those 0's will not be considered significant figures. For example, in the number 5,320, the 0 at the end would not be significant and there would be three sigfigs in this number.
What is the percent yield of a reaction that produces 12.5 g of the gas freon cf2cl from 32.9g of ccl4 and excess hf?
The percent yield of a reaction that produces 12.5 g of the gas freon cf2cl2 from 32.9g of ccl4 and excess HF is 48.33%
CCl4 + 2HF → CCl2F2 + 2HCl
Mass of CCl4 = 32.9 g
Mass of CCl2F2 (practical yield) = 12.5 g
Molecular mass of CCl4 = 153.82 g / mol
Number of moles of CCl4 = Mass of CCl4 / Molecular mass of CCl4
= 32.9 / 153.82
= 0.2139 mol
Number of moles of CCl4 = Number of moles of CF2Cl2 = 0.2139 mol
Molecular mass of CF2Cl2 = 120.91 g / mol
Mass of CCl2F2 = Number of moles of CF2Cl2 * Molecular mass of CF2Cl2
= 0.2139 * 120.91
Mass of CCl2F2 ( Theoretical yield ) = 25.8626 g
Percentage yield = Practical yield / Theoretical yield * 100
= 12.5 / 25.8626 * 100
Percentage yield = 48.33%
Hence, the percentage yield of CF2Cl2 is 48.33%
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The percent yield of a reaction that produces 12.5 g of the gas from CF2Cl2 from 32.9 g of CCl4 and excess HF is 48.33%.
Chemical equation:CCl4 + 2HF --- CCl2F2 + 2HCl
Mass of CCl4 = 32.9g
Mass of CCl2F2(practical yield) = 12.5g
Molar mass of CCl4 = 153.82 g/mil
Number of moles of CCl4= given mass / molar mass
= 32.9/153.82
= 0.2139mol
As we know
Number of moles of CCl4 = Number of moles of CF2Cl2 = 0.2139 mol
Molecular mass of CF2Cl2 = 120.91 g/ mol
Mass of CCl2F2= number of moles of CF2Cl2 × molar mass of CF2Cl2= 0.2139× 120.91
Mass of CF2Cl2 (Theoretical yield) = (12.5/25.8626) × 100
Percentage yield= 48.33%
Thus, we concluded that the percentage yield of CF2Cl2 is 48.33%.
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An ion of a single pure element always has an oxidation number of ________. a. 1 b. magnitude equal to its atomic number c. 0 d. none of these
The oxidation state of a pure element is always zero.
The oxidation state for a pure ion is equivalent to its ionic charge.
What is oxidation state?
The oxidation state or oxidation number, is the hypothetical charge of an atom if all of its bonds to different atoms were fully ionic. The oxidation state may be positive, negative or zero.
What are the rules to write the oxidation number?
1. The atoms in pure elements have oxidation number of ZERO.
2. The more-electronegative element in a binary molecular compound is assigned the number equal to the negative charge it would have as an anion. The less-electronegative element is assigned the number equal to the positive charge it would have as a cation.
3. Fluorine always has an oxidation number of -1 in compounds because it is the most electronegative element.
4. Oxygen is usually -2 unless in peroxides (then it is -1) or with fluorine.
5. Hydrogen has +1 in all compounds containing elements that are more electronegative than it, and is -1 in compounds with metals.
6. The algebraic sum of the oxidation numbers of all atoms in a neutral compound is zero.
7. The algebraic sum of the oxidation numbers of all atoms in a polyatomic ion is equal to the charge of the ion.
8. Although rules 1-7 apply to covalently bonded atoms, oxidation numbers can also be assigned to atoms in ionic compound. Monoatomic ions have oxidation numbers equal to their ionic charge.
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23 grams of sodium reacts with 293 cm 3 of water that is initially at 298 k. it produces an enthalpy change of 197 kj. what is the final temperature of the water? the specific heat capacity of water is 4.18 j/k g.
448 K is the final temperature of the water.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
Given,
the mass of Na is 23 g
The volume of water = 293 cm3
Mass of water = 293 g
Total solution mass = 23 g + 293 g = 316 g
Specific heat capacity of water = 4.18 J/Kg
The equation relating mass, heat, specific heat capacity and temperature change is:
q = mcΔT
197 kJ = 316 g x 4.18 J/Kg x ([tex]T_{finals} - T_ {initial}[/tex])
197 kJ = 316 g x 4.18 J/Kg x ( [tex]T_{finals}[/tex]-298 K)
0.1491429956 x 1000 = [tex]T_{finals}[/tex]-298 K
149.1429956 + 298 = [tex]T_{finals}[/tex]
447.1429956 = [tex]T_{finals}[/tex]
448 K = [tex]T_{finals}[/tex]
Hence, 448 K is the final temperature of the water.
What does a high specific heat capacity mean?A high specific heat capacity means that it can store a large amount of thermal energy for a small change in mass or temperature.
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The atomic and mass numbers for four different atoms are given below. Which two are isotopes?
Why is 15 m acetic acid an appropriate solvent in which to perform rate studies of electrophilic bromintations?.
Acetic acid activates the bromine and makes it a better electrophile.
What is bromination?
When a substance undergoes bromination, bromine is added to the compound as a result of the chemical reaction. After bromination, the result will have different properties from the initial reactant.
Why is 15M acetic acid used as a solvent for bromination?DCM (dichloromethane) requires more time. Acetic acid has protons that can give one of the Br (bromine) a positive charge and activate it. There is a brief loss of aromaticity that calls for high energy activation.
Refer to the attached image for bromination reaction.
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The bromine is activated by acetic acid, which improves its electrophilic properties.
What is meant by bromination?When a material gets brominated, the chemical reaction causes bromine to be added to the compound. The outcome will differ from the initial reactant in terms of its properties after bromination.Why is 15M acetic acid employed as a bromination solvent?DCM (dichloromethane) takes longer to process. One of the Br (bromine) atoms can be activated by the protons in acetic acid, which can give it a positive charge. Short-lived loss of aromaticity necessitates high-energy activation.For the reaction of bromination, refer to the attached file.To learn more about electrophilic bromination visit:
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My science exam is due tomorrow and I HAVE LIMITED TIME. can someone help me how to absorb anything you read and memorize it...
Answer:
It won't let me type this for some reason but here it is.
When a nonmetal bonds with a nonmetal: When a nonmetal bonds with a nonmetal: a molecular compound forms. a covalent bond is involved. electrons are shared. all of the above are true none of the above
When a nonmetal bonds with a nonmetal, a covalent bond is involved. Details about non-metals can be found below.
What is a nonmetal?A nonmetal is an element, such as phosphorus or chlorine, that does not have the chemical or physical properties of a metal.
A metal is known to lose or donate electrons when it goes into a reaction, hence, an electrovalent bond is usually formed.
However, a nonmetal is known to accept or gain electrons when it goes into reactions. This means that when two nonmetals bonds in a chemical reaction, a covalent bond is formed between them.
Covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.
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The whole cloves are broken up to help release the eugenol during distillation.
a. true
b. false
The statement is False.
No, whole cloves are not broken up to help release the eugenol during distillation.
Steam distillation:
Live steam is used in the co-distillation technique of steam distillation to separate mixture components. It works well to extract essential oil constituents with high boiling points, such as those with boiling points of 200°C. However, the oil vapors themselves are warmer—around 100°C—helping to maintain the compounds' structural integrity. It enables distillation to be carried out at lower temperatures than the boiling points of the constituent parts. The high-boiling essential oils are vaporized by steam, and after passing through a cooling system, the hot vapors that were formed from them condense back into a liquid along with water. A two-phase distillate, consisting of a water layer and an oil layer, is created because the oils are immiscible in water.Learn more about the Steam distillation with the help of the given link:
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What term refers to the addition (insertion) or removal (deletion) of one or more coding sequence letters (nucleic acids)?
Frameshift mutation refers to the addition (insertion) or removal (deletion) of one or more coding sequence letters (nucleic acids).
What is frameshift mutation?The insertion or deletion of nucleotide bases in amounts that are not multiples of three is referred to as a frameshift mutation in a gene. This is significant because a cell reads the genetic code for proteins in groups of three nucleotides. These so-called "triplet codons" each stand for one of the 20 different amino acids that go into making a protein.
The entire gene sequence after the mutation will be misread if a mutation alters this regular reading frame. This may lead to the incorrect amino acids being added to the protein or the development of a codon that prevents the protein from getting longer.
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1. In a 16 gram sample, how many grams of the parent isotope will be left after 3 half-lives?
A. 2
B. 3
C. 8
D. 16
2. Complete the balanced nuclear reaction below.
/64 → /62 + ?
A. 1n 0
B. 0e −1
C. 4He 2
D. 147Eu
3. How does the trend of proton-to-neutron ratio change as elements become heavier?
A. Elements continue to have an equal number of protons and neutrons.
B. Heavier elements have a great number of protons per neutron.
C. Heavier elements have a greater amount of neutrons per proton.
D. There is no trend between the ratio and the mass of the element.
4. A compound of multiple atom types has less mass than those of the individual atoms they are made of. What accounts for the missing mass?
A. Gamma decay
B. Chain reactions
C. Energy stored in electron bonds
D. Energy stored in the bonds in the nucleus
5. Carbon-14 decays to carbon-12 with a half-life of 5,730 years. How old is a carbon sample containing 3 grams of carbon-14 and 9 grams of carbon-12?
A. 5,730 years
B. 11,460years
C. 17,190years
D. 22,920 years
6. A major argument against nuclear power plants is that they:
A. Produce radioactive waste materials.
B. Release large amounts of carbon dioxide into the atmosphere.
C. Generate less electricity than other types of power plants.
D. Can’t be used at night.
7. A common source of radiation that humans are exposed to come from:
A. Eatingfood
B. An x-ray examination
C. Outer space
D. All of the above
8. Complete the following balanced nuclear reaction.
/92+/0→/36+ 1/0+?
A. 4He 2
B. 0e −1
C. 143Ba 56
D. 144Xe 54
Based on the half-life of the radioactive sample and the properties of nuclear reactions, the correct options are:
option Aoption Coption Coption Doption Boption A.option C.option CWhat is half-life?Half-life is the time taken for half the amount of atoms in an a radioactive element to decay.
1. After three half-lives, (1/2)³ of the original amount will remain = 1/8
1/8 of 16 = 2 ; option A
2. The balanced nuclear equation is given below:
action below:
/64 → /62 + 4He 2 ; option C
3. The trend of proton-to-neutron ratio as elements become heavier is that heavier elements have a greater amount of neutrons per proton; option C
4. The loss in mass of a compound composed of multiple atom types than those of the individual atoms they are made of is due to energy stored in the bonds in the nucleus known as the binding energy; option D
5. Initially, 12 g of carbon-14 was present
After one half-life, 6 g of carbon-14 remained, and 6 g of carbon-12 was present.
After two half-lives, 3 g of carbon-14 remained, and 9 grams of carbon-12 was present.
Age of the carbon sample = 5730 * 2 = 11460 years; option B
6. A major argument against nuclear power plants is that they produce radioactive waste materials; option A.
7. A common source of radiation that humans are exposed to come from outer space in the form of ultraviolet rays; option C.
8. The balanced nuclear reaction is:
/92+/0 → /36+ 1/0 + 143Ba 56 ; option C
In conclusion, nuclear reaction results in changes in the nucleus of atoms.
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Please answer this question for grade 9
To convert oxygen gas to solid, we need to continuous withdrawal of heat from the gas by cooling.
What makes up matter?Matter is composed of particles and these particles that compose matter are always in constant motion. This is the main thrust of the so called Kinetic Theory of Matter.
Now we know that the particles that compose a solid are held in a fixed position thus they spread out or expand when heated. The particles of a liquid tend not to be held in fixed positions thus they can be poured.
Given that oxygen has a boiling point of -219°C and a freezing point of -183°C, it follows that at 0°C is a gas and at -200°C, oxygen is a liquid.
To convert oxygen gas to solid, we need to continuous withdrawal of heat from the gas by cooling.
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Select the correct answer.
What is the mole ratio of Cl₂ to Br₂ in the given reaction?
Cl₂ + 2NaBr-2NaCl + Br₂
OA 1:1
OB. 1:2
OC. 2:3
O D. 2:1
Answer:
A.) 1:1
Explanation:
You can determine the mole ratio between substances by comparing their coefficients in the balanced equation. Both Cl₂ and Br₂ have coefficients of 1. Therefore, they have a 1 to 1 (1:1) relationship.
If you were comparing the mole ratio of Cl₂ and NaBr, they would have a 1:2 relationship because Cl₂ has a coefficient of 1 and NaBr has a coefficient of 2.