A single replacement or displacement reaction occurs when one ingredient in a compound replaces another. Only another metal can replace a less active one; a metal can only displace another metal, and a non-metal can only displace another non-metal.
Displacement reaction:The tendency of the element to lose electrons is what makes it metallic. Due to their bigger sizes and propensity to lose electrons as size, the number of shells, and nuclear force of attraction rise, the most active metals are found on the left side of the periodic table.
The reaction in which the more reactive element displaces the less reactive element is known as the displacement reaction.
When we combine an active metal with HCl, the reaction is as follows:
We are taking sodium, Na which is the most active metal. It will replace H in HCl because it is more reactive than H.
2Na + 2HCl → 2NaCl + H₂
Three ways to recognize if a single displacement reaction has taken place:
1. Color change
2. Formation of bubbles (a gas)
3. Formation of a precipitate
Learn more about displacement reaction here:
https://brainly.com/question/15343606
#SPJ4
What is the pressure in atm exerted by 1.8 g of H_{2} gas exert in a 4.3 L balloon at 27°C? R =; 0.821(L^ * atm)/(mol^ * K)
Answer:
5.12 atm
Explanation:
Before you can use the Ideal Gas Law to find the pressure, you need to convert grams to moles (via molar mass).
Molar Mass (H₂): 2(1.008 g/mol)
Molar Mass (H₂): 2.016 g/mol
1.8 grams H₂ 1 mole
---------------------- x ---------------------- = 0.893 moles H₂
2.016 grams
The Ideal Gas Law equation looks like this:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas Constant (0.0821 L*atm/mol*K)
-----> T = temperature (K)
After converting Celsius to Kelvin, you can plug the given values into the equation and simplify to find the pressure.
P = ? atm R = 0.0821 L*atm/mol*K
V = 4.3 L T = 27 °C + 273.15 = 300.15 K
n = 0.893 moles
PV = nRT
P(4.3 L) = (0.893 moles)(0.0821 L*atm/mol*K)(300.15 K)
P(4.3 L) = 22.0021
P = 5.12 atm
**Based on my past experiences, I believe the constant (R) you provided may have been mistyped. Instead of 0.821, I used 0.0821.**
the seasonal shifts of earths planetary wind and moisture belts are due to changes in the
The seasonal shifts of Earth's planetary wind and moisture belts are due to changes in the latitude that receives the sun's vertical rays.
What is the latitude?The latitude refers to the specific geographic coordinates at some point of the Earth in relation to the Equator line.
Latitude and longitude are geographic coordinates that allow to localize a specific point in the world by using the center of the Earth's planet as point of origin.
The amount of sun rays received by a given latitude largely depends on the season since the Earth's planet has a light inclination that alter this amount of radiation.
In conclusion, the seasonal shifts are due to changes in the latitude that receives the sun's vertical rays.
Learn more about the latitude and radiation here:
https://brainly.com/question/3005929
#SPJ1
Why do you not need to perform the titration while the sample is at its original temperature?
We do not perform the titration while the sample is at its original temperature because reaction is too slow at original temperature and requires high activation energy.
A titration is a method where the concentration of an unknown solution is ascertained by comparing it to a solution of known concentration. The analyte (the unknown solution) is typically added in a known amount to the titrant (the known solution) from a buret until the reaction is finished.
The slow energy step in the reaction process may require a high activation energy, and the proportion of activated molecules needed to reach this reaction at room temperature or original temperature is too low, so most molecules cannot cross this peak. As a result, the reaction at room temperature proceeds very slowly (the final product is not reached). Heat can enhance the proportion of active molecules and catalyse a larger-scale reaction.
Learn more about room temperature here;
https://brainly.com/question/1747376
#SPJ4
The penny coin was removed from circulation in Canada
In February of 2014. The United States may soon do the
same. The major reason for this move was the rising value
of copper metal. When copper’s value increased, pennies
were produced as a zinc slug with a thin layer of copper
plated over top. Zinc reacts readily with hydrochloric acid,
while copper does not. A triangular file is used to nick the
edge of a penny to expose the zinc slug below the layer
of copper. The zinc reacts with the acid releasing bubbles
from the nicked area until nothing remains but a thin shell
of copper. If 0.948 L of hydrogen gas is collected over water
at 20.0°C and a total pressure of 752 mm Hg, determine the
percentage by mass of the copper in the 2.586 g penny.
As a result, the dry gas volume at STP is 45.58 cm 3.
Water vapor is present in the gas. Since H2 is created during the reaction and water vapor is irrelevant when determining the equivalent weight, we only need the dry gas. As a result, the volume of H2 gas can be calculated using the ideal gas law.
P 1 = 750 mm Hg, 14 mm Hg, 736 mm Hg V = 50 cm 3 T = 17 0 C = 290 K
P = 760mmHg, V =?cm3, T = 0 0 and C = 273K.
The Gas equation follows.
P 1V 1/ T1 = P 2V 2/ T2
290/73650 = 273/760V 2
= 290760V 2
= 7365027V 2 = 45.58 cm
As a result, the dry gas volume at STP is 45.58 cm 3.
Learn more about Volume here-
https://brainly.com/question/1578538
#SPJ1
According to the iupac convention for chemical naming, which part of a hydrocarbon is selected as the main chain for a hydrocarbon chain?
Answer:
The longest continuous chain
Explanation:
Draw the major product formed in the reaction involving an acid anhydride dissolved in alcohol.
Ester is the major product formed in the reaction involving an acid anhydride dissolved in alcohol.
What is the chemistry of acid anhydrides?Acid chlorides and anhydrides both go through a number of similar reactions when subjected to nucleophilic action. Anhydrides react with water to generate carboxylic acids, with alcohols to form esters, and with amines to form amides, though they do so more slowly than acid chlorides. By using hydride reduction, anhydrides can also be converted to primary alcohols. As many anhydrides are created by coupling two carboxylic acids, one equivalent of the carboxylic acid is lost in anyhydride reactions as a leaving group. As a result, reactions are often only carried out using affordable, widely accessible anhydrides, such as acetic or benzoic. The advantage of anydrides over acid chlorides is that they are simpler to work with.Learn more about acid anhydride here:
https://brainly.com/question/3678985
#SPJ4
Why are thiols more nucleophilic than alcohols?
Answer:
Thiols contain stronger acids than alcohols
Explanation:
Answer:
Sulfur is a bigger atom than oxygen and has a lower electgronegativity value. Therefore, the lone pair availability in thiol is higher than alcohol
Explanation:
The condition of acidosis can cause ____________ because the higher h concentration diffuses to the icf, pushing k towards the ecf
Acidosis is a disorder in which there is excess acid in the body. This condition can lead to hyperkalemia due to the diffusion of hydrogen ions in the intracellular fluid.
What is hyperkalemia?Hyperkalemia is an increased concentration of the fluid potassium level than normal. Though potassium (K) is needed by the body for various functions of the nervous system and muscles their excess can lead to diseases.
It can also be caused by acidosis, where the concentration of the hydrogen ion increases in the intracellular fluid which leads to a large movement of potassium ions toward the extracellular fluid.
Therefore, the condition of acidosis can cause hyperkalemia.
Learn more about hyperkalemia here:
https://brainly.com/question/8920601
#SPJ4
Cellular respiration release co2 and photosynthesis absorbs co2. these two reactions are part of which biogeochemical cycle?
The metabolic process that takes place in an organism's cells is called cellular respiration. Both photosynthesis and cellular respiration contribute carbon dioxide to the biogeochemical cycle.
What is biogeochemical cycle?
The mechanism that distributes and circulates abiotic chemical elements among the various realms of the planet is known as the biogeochemical cycle. The carbon, water, nitrogen, phosphorus cycle, etc. are all included.
Carbon dioxide is released during cellular respiration as a waste gas into the atmosphere, where it is then taken by plants to produce energy, which is then utilized by the organism, which then releases more carbon dioxide. The ecological chain's carbon cycle continues from the producer to the consumer.
Therefore, the carbon cycle is influenced by photosynthesis and cellular respiration.
Learn more about the biogeochemical cycle here:
https://brainly.com/question/27786512
#SPJ4
The half-life of sr-90 is 28 years. after 56 years of decay only 0. 40 g of a sample remains. what was the mass of the original sample?
a. 0. 050 g
b. 0. 10 g
c. 3. 2 g
d. 1. 6 g
Half-life is the time taken for the concentration of the substance to reduce by 50%. The original sample of strontium had a mass of 1.6 gms. Thus, option d is correct.
What is half-life?The half-life of any radioactive substance is the time period at which the concentration will get reduced to half the initial amount. The initial mass of Sr-90 is calculated as,
[tex]N(t) = N_{0} (\dfrac{1}{2})^{ \frac{t }{t 1/2}}[/tex]
Given,
Quantity of the remaining substance N (t) = 0.40 gm
Initial radioactive substance quantity [tex]N_{0}[/tex] =?
Time duration (t) = 56 years
Half-life = 28 years
Substituting values above:
[tex]\begin{aligned} 0.40 &= N_{0} (\dfrac{1}{2}) ^{{\frac{56}{28}}\\\\0.40 &= N_{0} (\dfrac{1}{2})^{2}\end{aligned}[/tex]
= 1.6 gm
Therefore, option d. the initial mass of Sr is 1.6 gm.
Learn more about half-life here:
https://brainly.com/question/16145921
#SPJ4
Ethylene glycol has a specific heat of 0. 578 cal/(g•°c). if 23. 2 g of ethylene glycol absorbs 75. 6 cal of heat energy, what will the temperature increase be?
Ethylene glycol has a specific heat of 0. 578 cal/(g°c). If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy. The temperature increase be 5.64°C.
What is Specific Heat ?The amount of heat needed to raise the temperature of 1 kg of substance.
It is expressed as
Q = mcΔT
where,
Q = Heat energy
m = Mass
c = Specific heat capacity
ΔT = Change in temperature.
Here,
Q = 75.6 cal
m = 23.3 g
c = 578 cal/(g°c)
Now put the values in above formula we get
Q = mcΔT
75.6 cal = 23.2 g × 578 cal/(g°c) × ΔT
ΔT = 5.64°C
Thus from the above conclusion we can say that Ethylene glycol has a specific heat of 0. 578 cal/(g°c). If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy. The temperature increase be 5.64°C.
Learn more about the Specific Heat here: https://brainly.com/question/13439286
#SPJ4
Which are properties of all metals (except hg)? i. good conductors of heat and electricity ii. easily formed into sheets or wires iii. chemically unre
The properties of all metals are "good conductors of heat and electricity".
Metals are excellent heat or electricity conductors and were malleable, ductile materials that may be pulled into wire and pounded into sheets. Apart from mercury, which appears a liquid at ambient temperature, most metals have solids with a distinctive silvery shine.
Due to the metals' atoms' ability to create a matrix across which outside electrons could easily travel, metals make good electrical and thermal conductors. The positive nuclei of the connecting metal ions are surrounded by a sea of electrons rather than orbiting their individual atoms.
Therefore, the properties of all metals are "good conductors of heat and electricity".
To know more about metals
https://brainly.com/question/18153051
#SPJ4
A mixture of h2po4- and oh- is allowed to react. what are the products of the reaction?
When mixture of H2PO4- and OH- is allowed to react. The products of the reaction are as follow
H2PO4+ OH--------HPO4(2-)+H2O
In the reaction above H2PO4(2-) is donating the proton to OH Resulting in H2O and the deprotonated species. This makes it a bronsted lowry acid.
According to Bronsted lowry, acid are those which donate proton.
In the given problem, H2PO4- is bronsted lowry acid. So it donate electron to OH- to form water.
Thus, the product formed in the given reaction is water and H2PO4(2-).
learn more about bronsted lowry:
https://brainly.com/question/14407412
#SPJ4
The condensation of water vapor in the atmosphere and subsequent transfer to the ocean via precipitation is an example of a(n)?
The condensation of water vapor in the atmosphere and subsequent transfer to the ocean via precipitation is an example of a Water Cycle.
What is Water Cycle ?Water cycle is also called hydrologic cycle that shows the continuous movement of water between the air and land.
What are the stages in Water Cycle ?There are four main stages in the water cycle:
Evaporation Condensation Precipitation CollectionThus from the above conclusion we can say that The condensation of water vapor in the atmosphere and subsequent transfer to the ocean via precipitation is an example of a Water Cycle.
Learn more about the Water Cycle here: https://brainly.com/question/25796102
#SPJ4
What is the molarity of a solution in which 55. 49 g of calcium chloride is dissolved in enough water to make 500. ml of solution?
The molarity of a solution in which 55. 49 g of calcium chloride is dissolved in enough water to make 500. ml of solution is 1M.
What is molarity?It is defined as number of moles of solute divided by volume of solution.
Given,
Mass of CaCl2 =55.49g
Molar mass of CaCl2 =40+35+35=110g
Mole= given mass/ molar mass
= 55.49/110=0.50mol.
Now, putting all values we get the molarity
Molarity =0.5×1000/500=1M
Thus, the molarity of given solution is 1M.
learn more about Molarity:
https://brainly.com/question/26921570
#SPJ4
The reaction between an alcohol and an anomeric carbon of a carbohydrate forms a _____ bond.
What mass of ch4 is consumed when 587. 9 kj of energy is evolved from the combustion of a mixture of ch4(g) and o2(g)? show the set up and answer with unit
The mass of CH₄ that is consumed is 10.598 g.
What is enthalpy?The enthalpy of a system is defined as the sum of the internal energy of a system and the energy that is produced due to its pressure and volume.
It is given by
H = U+PV
The following reaction takes place during the combustion of CH₄
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)[/tex]
Energy evolved during the combustion, E = 587.9 kJ
Enthalpy of combustion of methane, ∆H = 890.3 kJ
[tex]No of moles of CH_4 =\frac{energy evolved}{enthalpy of combustion}[/tex]
= 587.9 /890
Mass of CH₄ that is consumed = no of moles × molar mass of CH₄
= 587.9 /890 × 16
= 10.598 g
The mass of CH₄ which is consumed is 10.598 g
Learn more about enthalpy:
https://brainly.com/question/14047927
#SPJ4
What type of reaction is a grignard reaction? What is the critical intermediate (which can be isolated and enables the final product)?
Organometallic Chemical reaction is a Grignard reaction. The critical intermediate (which can be isolated and enables the final product) is the formation of a carbon bond.
The Grignard Reaction is an organometallic chemical reaction that mostly produces C-C bonds. When organic molecules are combined with the Grignard reagent, the Grignard reaction occurs (Rmgx).
The Grignard Reaction is the conversion of an aldehyde or ketone into secondary or tertiary alcohol by the addition of an organomagnesium halide (Grignard reagent). A primary alcohol is produced when formaldehyde and oxygen react.
Alcohol and water molecules have acidic hydrogen atoms that Grignard reagents quickly react with. A proton substitutes the halogen in a Grignard reaction with water, producing an alkane as the end result. Therefore, the Grignard reagent offers a two-step process for changing a haloalkane into an alkane.
To learn more about Grignard's reaction please visit -
https://brainly.com/question/17135014
#SPJ4
1) A certain compound has an empirical formula of CH_6O_ 2. Its molar mass is between 285 and 315 g/mol. What is its molecular formula?
CH_6O_2
C_4H_24O_8
C_6H_36O_12
C_5H_30O_10
2) certain compound has an empirical formula of NH_2O. Its molar mass is between 55 and 65 g/mol. What is its molecular formula?
NH_2O
N_2H_2O_2
N_2H_4O_2
N_4H_8O_4
3) A certain compound is found to have the percent composition (by mass) of 88.9 percent C and 11.1 percent H. The molar mass of the compound was found to be 54.0 g/mol. Calculate the empirical formula and the molecular formula.
C_2H_3 and C_4H_6
C_2H_6 and C_3H_9
CH_2 and C_3H_6
CH_3 and C_2H_6
4) The characteristic odor of pineapple is due to ethyl butyrate. It contains 62.07 percent carbon, 10.34 percent hydrogen, and 27.59 percent oxygen. Determine the empirical formula.
C_6H_6O_2
C_6H_12O_2
C_3H_3O
C_3H_6O
5) Zircon is a diamond-like material that has the composition 49.76 percent Zr, 15.32 percent Si, and 34.91 percent O. What is the empirical formula of zircon?
ZrSiO
ZrSiO_2
ZrSiO_3
ZrSiO_4
1. The molecular formula of the compound is C₆H₃₆O₁₂
2. The molecular formula of the compound is N₂H₄O₂
3 The empirical formula and molecular formula of the compound are: C₂H₃ and C₄H₆
4. The empirical formula of the compound is C₃H₆O
5. The empirical formula of the compound is ZrSiO₄
1. How to determine the molecular formula Empirical formula = CH₆O₂Molar mass = (285 + 315) / 2 = 600 / 2 = 300 g/moleMolecular formula =?Molecular formula = empirical × n = molar mass
[CH₆O₂]ₙ = 300
[12 + (6×1) + (16×2)]ₙ = 300
50n = 300
Divide both side by 74
n = 300 / 50
n = 6
Molecular formula = [CH₆O₂]ₙ
Molecular formula = [CH₆O₂]₆
Molecular formula = C₆H₃₆O₁₂
2. How to determine the molecular formula Empirical formula = NH₂OMolar mass = (55 + 65) / 2 = 120 / 2 = 60 g/moleMolecular formula =?Molecular formula = empirical × n = molar mass
[NH₂O]ₙ = 60
[14 + (2×1) + 16]ₙ = 60
32n = 60
Divide both side by 32
n = 60 / 32
n = 2
Molecular formula = [NH₂O]ₙ
Molecular formula = [NH₂O]₂
Molecular formula = N₂H₄O₂
3. How to determine the empirical formula and molecular formulaWe'll begin by obtaining the empirical formula. This is illustrated below:
Carbon (C) = 88.9%Hydrogen (H) = 11.1%Empirical formula =?Divide by their molar mass
C = 88.9 / 12 = 7.4
H = 11.1 / 1 = 11.1
Divide by the smallest
C = 7.4 / 7.4 = 1
H = 11.1 / 7.4 = 3/2
Multiply by 2 to express in whole number
C = 1 × 2 = 2
H = 3/2 × 2 = 3
Thus, the empirical formula of the compound is C₂H₃
Finally, we shall determine the molecular formula of the compound. This is illustrated below:
Molar mass of compound = 54 g/molEmpirical formula = C₂H₃Molecular formula =?Molecular formula = empirical × n = molar mass
[C₂H₃]ₙ = 75.16
[(12×2) + (3×1)]ₙ = 54
27n = 54
Divide both side by 27
n = 54 / 27
n = 2
Molecular formula = [C₂H₃]ₙ
Molecular formula = [C₂H₃]₂
Molecular formula = C₄H₆
4. How to determine the empirical formulaCarbon (C) = 62.07%Hydrogen (H) = 10.34%Oxygen (O) = 27.59%Empirical formula =?Divide by their molar mass
C = 62.07 / 12 = 5.1725
H = 10.34 / 1 = 10.34
O = 27.59 / 16 = 1.724
Divide by the smallest
C = 5.1725 / 1.724 = 3
H = 10.34 / 1.724 = 6
O = 1.724 / 1.724 = 1
Thus, the empirical formula of the compound is C₃H₆O
5. How to determine the empirical formulaZr = 49.76%Si = 15.32%O = 34.91%Empirical formula =?Divide by their molar mass
Zr = 49.76 / 91 = 0.547
Si = 15.32 / 28 = 0.547
O = 34.91 / 16 = 2.182
Divide by the smallest
Zr = 0.547 / 0.547 = 1
Si = 0.547 / 0.547 = 1
O = 2.182 / 0.547 = 4
Thus, the empirical formula of the compound is ZrSiO₄
Learn more about empirical and molecular formula:
https://brainly.com/question/24297883
#SPJ1
You are asked to weigh approximately 0. 4g of acetylsalicylic acid to the nearest mg. When you enter the data in grams in your lab notebook, how many significant figures will you record ?.
The significant figures will be 1.
As, weight of acetylsalicylic acid = 0. 4 g
We obtain 400 mg when we convert 0.4g of acetylsalicylic acid to mg.
So, 400 milligrams are worth 0.4 grams when converted to grams.
There is just one significant figure because 0 before a decimal is not significant i.e. 4.
What are significant figures?The digits of a number that have relevance in relation to the measurement's resolution are known as significant figures. Additionally known as significant figures in chemistry. All experimental measurements are subject to some degree of uncertainity.
Check more such questions based on significant figure here:
brainly.com/question/24491627
#SPJ4
using the equation 40kj+ 2so3= 2so2+02, of so3=0.491, so2=0.17, 02=0.701, find Keq
The equilibrium constant, Keq for the reaction, given the data from the question is 0.084
What is equilibrium constant?The equilibrium constant, Keq for a reaction is the ratio of the concentration of the products raised to their coefficients to the ratio of the concentration of the reactants raised to their coefficients. For example, the equilibrium constant for the reaction nA + mB <=> eC can be obtained as follow
Keq = [C]^e / [A]^n × [B]^m
How to determine the equilibrium constant for the reaction Equation: 40 KJ + 2SO₃ <=> 2SO₂ + O₂[SO₃] = 0.491 M[SO₂] = 0.17 M[O₂] = 0.701 MEquilibrium constant (Keq) =?The equilibrium constant, Keq for the above reaction can be obtained as illustrated below:
Keq = [SO₂]^2 × [O₂] / [SO₃]^2
Keq = (0.17)^2 × (0.701) / (0.491)^2
Keq = 0.084
Thus, the equilibrium constant, Keq for the reaction is 0.084
Learn more about equilibrium constant:
https://brainly.com/question/17960050
#SPJ1
HELP PLS PLS PLS ILL MARK U BRAINLIEST!
Answer:
2 NaI ---> 2 Na + I₂
Explanation:
The only way the reactant NaI can decompose is by separating into 2 atoms, Na and I. However, you must take into account that iodine (I) exists as a diatomic molecule.
An equation is balanced when there is an equal amount of each element on both sides of the reaction. These amounts can be modified by adding coefficients in from of the molecules/atoms.
The unbalanced equation:
NaI -----> Na + I₂
Reactants: 1 sodium, 1 iodine
Products: 1 sodium, 2 iodine
The balanced equation:
2 NaI ---> 2 Na + I₂
Reactants: 2 sodium, 2 iodine
Products: 2 sodium, 2 iodine
* Write ionic equation, including state symbols for the reaction of
Silver nitrate solution + sodium chloride solution = silver chloride + sodium nitrate solution.
please hurry
Answer:
Ag+ (aq) + Cl- (aq) --> AgCl (s)
Explanation:
What does the kinetic theory state about the relationship between the speed and temperature of gas molecules?
As the temperature increases, the speed of gas molecules increases
The kinetic theory state about the relationship between the speed and temperature of gas molecules as with an increase in temperature, the speed of gas molecules increases.
The energy that an object possesses as a result of its motion is known as kinetic energy.
The average of the kinetic energies of all the particles in a system is known as the average kinetic energy.
The following equation provides the answer:
K = [tex]\frac{3RT}{2}[/tex]
K= kinetic energy
R= gas constant
T= temperature
It is clear from above that kinetic energy and system temperature are inversely correlated. Therefore, if the temperature is higher, the system's average kinetic energy will also be higher, increasing the speed of the molecules.What does kinetic theory state?
The kinetic theory of matter states that all matter is made of small particles that are in random motion and that have space between them.
To learn more about kinetic theory visit:
https://brainly.com/question/14349214
#SPJ4
i need help pleaseee help please! <3
(a) The temperature goes up by 3⁰C.
(b) There is increase in temperature, so the reaction is exothermic.
(c) Examples of exothermic reaction include, rusting of Iron, burning of coal, reaction of strong acid and water.
(d) Examples of endothermic reaction include, melting solid salts and evaporating liquid water.
What is exothermic reaction?
Exothermic reaction is a type of chemical reaction in which energy is transferred to or from the surroundings.
Examples of exothermic reactions include the following;
Rusting of IronBurning of CoalReaction of Strong Acid and WaterWater and Calcium ChlorideWhat is endothermic reaction?Endothermic reaction is a type of chemical reaction in which energy is absorbed from the surroundings.
Examples of endothermic reactions include the following;
Melting solid salts.Evaporating liquid water, etcChange in temperatureFrom the increase in temperature from 15⁰C to 23⁰C, we can conclude that the temperature goes up by 3⁰C.
20⁰C - 17⁰C = 23⁰ - 20⁰C = 3⁰C.
Since there is increase in temperature, the reaction is exothermic.
Learn more about exothermic reaction here: https://brainly.com/question/2924714
#SPJ1
A body was found lying face up in a residence. The body had 4 incised wounds on the trunk centered in the area around the heart and center of the abdomen. The wounds were all about 1.2 inches wide and varied in depth from 4 inches to 6.5 inches. The temperature in the residence was found to be 70° F by both a thermometer and the thermostat setting. The body temperature was measured to be 70°. No rigor mortis was noted in the body. Livor mortis was found on the back and remained dark when pressed. A wound measuring 3 inches by 0.5 inches was found next to a yellow bruise on the eyebrow bone area. Tissue bridges were found in 2 areas of this wound.
Metal nitrates other than the alkali elements on heating decompose into the corresponding metal __ along with the evolution of nitrogen peroxide and oxygen.
The correct answer is nitrates.
NitratesThe chemical formula for nitrate is [tex]NO_{3}[/tex]. Nitrate is a polyatomic ion. Nitrates are the name for salts that contain this ion. Common nitrate ingredients in explosives and fertilizers. Water is a solvent for almost all inorganic nitrates. Bismuth oxynitrate is one type of insoluble nitrate. Tests of endurance exercise performance show that dietary nitrate supplementation is effective. When young, healthy people consume significant amounts of nitrate, whether in the form of pure sodium nitrate or beet juice, their plasma nitrate concentration is quickly increased by a factor of 2 to 3, and this elevated nitrate concentration can be sustained for at least two weeks. Nitric oxide, or NO, is produced in response to elevated plasma nitrate.
Metal nitrates other than the alkali elements on heating decompose into the corresponding metal __ along with the evolution of nitrogen peroxide and oxygen.
Learn more about nitrates here:
https://brainly.com/question/12768349
#SPJ1
A piece of plastic has a net charge of 2. 00 μc. How many more protons than electrons does this piece of plastic have?
The piece of plastic has 1.256× 10¹³ protons more than that of electrons.
What are protons and electrons?A proton is a subatomic particle with a defined mass of 1 and a charge of +1 (positive charge). The symbol for the proton is either p or p+.
An electron is a subatomic particle that has a negative electric charge and that actively orbits the nucleus of the atom .
To calculate ,
given ,
magnitude of charge , q=+2μC=+2×10⁻⁶
Since, protons carry positive charge. Then, we know that standard number of proton in 1 Coulomb of charge is,
1C=6.28×10¹⁸ protons
Number of protons in 1 microcoulomb charge is,
=6.28×10¹⁸×10⁻⁶
=6.28×10¹²
Then for the net charge of q, the number of protons is given as,
np= q×6.28×10¹²
np= 2×6.28×10¹²
np=1.256×10¹³ protons
Thus, the piece of plastic has 1.256×10¹³ more protons than electrons.
Lear more about electron and proton ,here:
https://brainly.com/question/1421805
#SPJ1
A particular buffer solution consists of a weak acid and its conjugate base. How could this buffer solution be modified so as to increase its buffer capacity against added base?
The only way increase the buffer capacity is to increase the total concentration of the system (conjugated acid + base).
What is buffer capacity?
The buffer capacity can be defined as the amount of strong base needed to change the pH of 1 liter of solution by 1 pH unit.
To increase buffer capacity to modify buffer solution-
The buffer capacity of a buffer, consisting of a weak acid and its conjugated base is given by the following equation:
π=㏑ 10 [{H⁺} + K ÷ H⁺ + CKα [H⁺] ÷ [H⁺] + Kα]
With [H^+] the concentration of the H^+ ion ; C the total buffer concentration (i.e. acid + conjugated base) and Kα the acidity constant.
It is clear from this equation that the buffer capacity is directly proportional to the concentration.
So the only way increase the buffer capacity is to increase the total concentration of the system (conjugated acid + base).
Learn more about buffer capacity , here:
https://brainly.com/question/22904821
#SPJ4
What mass of CaCO3 is required to react completely with 25. 0 ml of 0. 750 m HCl?
There are 0.94 g mass of [tex]CaCO_{3}[/tex] is required to react completely with 25. 0 ml of 0. 750 m HCl .
Calculation ,
Mass of [tex]CaCO_{3}[/tex] = ?
The 1000ml of HCl = 27.375 g
then the 1 ml of solution contains HCl = 27.375 g/1000×1
25 ml of solution contains HCl = 27.375 g/1000 × 25 = 0.684 g
The chemical equation can be given as :
[tex]CaCO_{3} +HCl[/tex] → [tex]CaCl_{2} +CO_{2} +H_{2} O[/tex]
2 mol of HCl reacts with 1 mol of [tex]CaCO_{3}[/tex]
The amount of [tex]CaCO_{3}[/tex] reacted is given by ,
100/71 × 0.684 g = 0.9639 g = 0.94 g
To Learn more about mass of calcium carbonate
https://brainly.com/question/13565765
#SPJ4