Answer:
The temperature at 760mmHg if the volume is still 4.2 L is 400.862 K
Explanation:
Gay Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. This law can be expressed mathematically as follows:
[tex]\frac{P}{T} =k[/tex]
Having an initial state 1 and a final state 2, the following is true:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 560 mmHgT1= 72 F= 295.372 K (being 32 F= 273.15 K)P2= 760 mmHgT2= ?Replacing:
[tex]\frac{560 mmHg}{295.372 K} =\frac{760 mmHg}{T2}[/tex]
Solving:
[tex]T2= 760 mmHg*\frac{295.372 K}{560 mmHg}[/tex]
T2= 400.862 K
3. Components in a heterogeneous mixture are not in the same phase or the composition of the mixture is
a) uniform
b) transparent
c) uneven
4. Mixing sand and salt in water then passing it through a filter separates out the sand because salt
in water and sand does not.
a) reacts
b) dissolves
c) disappears
Answer:
c
Explanation:
32. Explain why carbon shows versatile nature why it forms so many organic compounds.
Answer:
Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.
Explanation:
meaning of versatile: capable of or adapted for many different uses, skills, etc. 2 variable or changeable.
The versatile nature of carbon can be best understood with its features such as, tetravalency and catenation. In this section let us learn more about versatility of carbon.
Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.
The two characteristic features seen in carbon, that is, tetravalency and catenation, put together give rise to a large number of compounds. Many have the same non-carbon atom or group of atoms attached to different carbon chains.
Catenation: The property of forming long chains by self-linking with other carbon atoms to form long chains, rings, double or triple bonds is called catenation.
Isomerism: Compounds with same molecular formula but different structural formula are called isomers. An isomerism commonly seen is due to difference in the arrangement of atoms or groups of atoms & is called structural isomerism. The 4 types of structural isomerism are:
Chain isomerism
Position
Functional
Metamerism
Tetravalency: Carbon has 4 electrons in its valence shell. Energy considerations do not allow it to gain or lose 4 electrons; therefore it forms covalent bonds with other elements to complete its octet. This accounts for its tetravalency and explains its ability to form a variety of compounds.
10 examples of salt in chemistry
Answer:
nacl cacl kcl mgcl k2so4 na2co3 na2so4 kno3 nahco3 naco3
Explanation:
Lance wants to separate out the salt from a solution of salt water how can he do this
*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
Answer: Boiling the water
I hope this helped!
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*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
Solution (a) has a hydrogen ion concentration of 2.7 x 10^-3 and solution (b) has a hydrogen ion concentration of 4.1 M. What are their pH and say if they are acids or bases.
Answer: a) pH = 2.56 , acidic
b) pH = 2.38, acidic
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
a) [tex][H^+]=2.7\times 10^{-3}[/tex]
Putting in the values:
[tex]pH=-\log[2.7\times 10^{-3}][/tex]
[tex]pH=2.56[/tex]
Thus as pH is less than 7, the solution is acidic.
b) [tex][H^+]=4.1\times 10^{-3}[/tex]
Putting in the values:
[tex]pH=-\log[4.1\times 10^{-3}][/tex]
[tex]pH=2.38[/tex]
Thus as pH is less than 7, the solution is acidic.
plz help me.....im new here
Answer:
Fe2S3
Explanation:
Answer:
Option 3rdFe2S3
Explanation:
As, the ionic valency of Iron (Fe) that is + 3 interchanges with the ionic valency of Sulphide that is - 2 to form-
Fe2S3
d. 2 5. How many moles of HCl are needed to produce 25 moles of KCl in the presence of excess potassium permanganate? a. 16 b. 32 c. 5 d. 200
Answer:
d. 200.
Explanation:
The reaction is:
2KMnO4 + 16HCl ----> 2KCl + 2MnCl2 + 8H2O + 5Cl2
So 2 moles of KCL are produced form 16 moles of HCL
So 25 moles KCL are made from 25 * (16/2) HCl.
= 25 * 8
= 200 moles. HCl.
A balloon has a volume of 5.0 L at a pressure of 0.863 atm. What is the volume of the balloon in
liters if the atmospheric pressure is reduced to 0.321 atm?
Answer:
V₂ = 13.44 L
Explanation:
Given that,
Initial volume, V₁ = 5 L
Initial pressure, P₁ = 0.863 atm
Final pressure, P₂ = 0.321 atm
We need to find the final volume of the balloon. The relation between the volume and pressure is given by :
[tex]P_1V_1=P_2V_2[/tex]
Where
V₂ is the volume of the balloon
So,
[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{0.863 \times 5}{0.321 }\\\\V_2=13.44\ L[/tex]
So, the final volume of the balloon is equal to 13.44 L.
What is the complete ionic equation for Hydrochloric acid and sodium hydroxide
Hydrochloric acid: HCl(aq)
Sodium hydroxide: NaOH(aq)
The two substances react in an acid-base neutralization reaction to produce aqueous sodium chloride and liquid water.
The complete ionic equation is:
H⁺(aq) + Cl⁻(aq) + Na⁺(aq) + OH⁻(aq) → Na⁺(aq) + Cl⁻(aq) + H₂O(l).
Michelle learns in science class that simple machines such as an inclined plane can change the amount of force needed to lift heavy objects. She decides to test this with an experiment.
Michelle chooses a 10 kg weight. She sets up a ramp made of smooth metal that makes an angle θ with the floor. She attaches a spring scale to the weight and the top of the ramp in order to hold the weight in place. She records the force from the spring scale, then changes θ and records it again. She repeats this several times.
In this experiment, what is the outcome variable (dependent variable)?
A.
the angle θ between the ramp and the ground
B.
the mass of the weight
C.
the material the ramp is made of
D.
the amount of force on the spring scale
PLEASE I NEED HELP ON THIS RN AND IT'S DUE TODAY!!!!!!!!
IF YOU POST ANY LINKS THAT ARE PERM-BLOCKED, I WILL REPORT YOU, TAKE YOUR POINTS AWAY, DELETE YOUR ANSWER, AND PROBABLY BAN YOU! IF YOU DO NOT KNOW, DON'T ANSWER!!!!!!!
Answer: the amount of force on the spring scale
Explanation:
when pressure is kept constant then the temperature varies with volume
a. directly
b. inversely
c. none of these
d. both a and b.
Answer:
A
Explanation:
4NH3(g) + 6NO(g)→5N2(g) + 6H2O(g) Using the balanced equation calculate the mass of N2 produced from 100 grams of NH3 racing with an unlimited supply of NO.
Here's link to the answer:
bit.[tex]^{}[/tex]ly/3a8Nt8n
Which equation represents a fusion reaction?
Please answer asap
(Look at picture)
Answer:c
Explanation:
5.
Cr(NO3)3 (aq)
+
Ba (s)
Complete lonic:
I
Net lonic:
Answer:
Complete ionic: 2Cr(3+) + 6(NO3)- + 3Ba = 2Cr + 3Ba(2+) + 6(NO3)-
Net ionic; 2Cr(3+) + 3Ba = 2Cr + 3Ba(2+)
Explanation:
We are given;
Cr(NO3)3 (aq) + Ba (s)
Let's first find the product of this reaction before getting the complete and net ionic equations.
2Cr(NO3)3 + 3Ba = 2Cr + 3Ba(NO3)2
The complete ionic equation will be;
2Cr(3+) + 6(NO3)- + 3Ba = 2Cr + 3Ba(2+) + 6(NO3)-
The net ionic equation is gotten by eliminating the spectator ions from both left and right hand sides of the equation.
Thus, net ionic equation is;
2Cr(3+) + 3Ba = 2Cr + 3Ba(2+)
. What is the OH- concentration of a neutral solution?
A neutral solution is one that is neither acidic nor basic. The hydrogen ion concentration equals the hydroxide ion concentration, and both equal 1 X 10-7 M. In a neutral solution, then, pH = pOH = 7.
H2SO4 + 2 NaOH →
Na2SO4 + 2 H20
What mass of H2SO4 would be required to react with 2.25 mol of NaOH?
Answer:
110.25grams
Explanation:
The balanced chemical equation is as follows:
H2SO4 + 2NaOH → Na2SO4 + 2H20
Based on the balanced chemical equation of the reaction given above, 1 mole of sulphuric acid (H2SO4) is required to react with 2 moles of sodium hydroxide (NaOH).
Hence, if 1 mol of H2SO4 is needed to react with 2 moles of NaOH
Then, 2.25mol of NaOH will be required to react with;
= 2.25/2
= 1.125mol of H2SO4
Using the formula, mole = mass/molar mass, we can convert the molar value of H2SO4 to its mass value.
Molar mass of H2SO4 = 1(2) + 32 + 16(4)
= 2 + 32 + 64
= 34 + 64
= 98g/mol
Therefore, mole = mass/molar mass
1.125 = mass/98
mass = 98 × 1.125
mass = 110.25grams of H2SO4
Find the number of moles in 1.00 x 1023 atoms of chromium.
Answer:
0.17 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.00 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1}{6.02} \\ = 0.166112[/tex]
We have the final answer as
0.17 molesHope this helps you
what do molecules and elements have in common
Answer:
They both are made up of atoms and having bonds linking their atoms together.molecules and compounds also share the qualities of being both pure and homogeneous substances.
Explanation:
Hope this helped!!!
3. Look at the reaction below:
H2O + C —— CO+ H2
AH = +130kJ mol^-1
Explain what happens to the position of equilibrium if we:
a. increase the pressure
b. increase the concentration of hydrogen gas
c. increase the temperature
d. add a catalyst
Explanation:
a. pressure always favors the side with fewer molecules. in this reaction as both the sides have equal number of molecules, there won't be any change in the position of the equilibrium.
b. when the concentration of the hydrogen gas is increased. more particles would take place in the reaction and so, the rate of reaction would increase favoring the reaction concerning hydrogen gas molecules (backward reaction in this case) therefore, equilibrium would shift to the backward reaction (left).
c. as forward reaction is endothermic, when temperature is increased the equilibrium will shift to the forward reaction (right).
d. catalyst would not have any effect on the position of the equilibrium. it will only increase the rate of reaction.
hope it helps. :)
Lithium nitride LiN LiN3 Li3N
Answer:
Li3N
Explanation:
Lithium nitride is a compound with the formula Li₃N
Hope this helped!!!
Answer:
C
the next answer is B
the next one is C
Explanation:
What is one definition of a base?
O A. A substance that increases the hydroxide ions in a solution
B. A substance that forms a salt when it dissolves in water
O C. A substance that stops the flow of electrons when dissolved
O D. A substance that makes the pH of a solution more acidic
Answer:
the answer is A
Explanation:
The base increases Hydroxide ions in a solution e.g NaOH
Answer:
A
Explanation:
Plz help I need help plz
Now balance the chemical
reaction by providing the correct
whole number coefficients:

Answer:
2(C4H10)+13(O2)->8(CO2)+[](H20)
Explanation:
sorry i couldn’t get the last one
The chemical reaction by providing the correct whole number coefficients: number coefficients will be 2C4H10 + 13O2 WILL GIVE 8CO2 + 10H2O .this will be the balanced reaction.
What is the balanced reaction?Balance elements in the equation other than O and H. Balance the oxygen atoms by adding the appropriate number of water ( H 2O) molecules to the opposite side of the equation.
Balance the hydrogen atoms (including those added in step 2 to balance the oxygen atom) by adding H + ions to the opposite side of the equation.
When writing an equation for a chemical reaction, the two sides of the equation should balance and need the same number of each kind of element on both sides.
Therefore the given chemical equation is balanced in the following form, 2C4H10 + 13O2 WILL GIVE 8CO2 + 10H2O
Learn more about the balanced equation, here :
https://brainly.com/question/14263388
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Can someone help me plss
Answer:
the 3rd option is correct I promise
Explanation:
matter can not be created or destroyed no matter what, most important rule is chemistry
1. How is extinction different from mass extinction?
Answer:
Extinction is the elimination of one species whereas mass extinction results in multiple animals to become extinct.
the volume of alcohol present in 409ml of 11%
Answer:
Amount of Alcohol volume present in solution = 44.99 ml
Explanation:
Given:
Total volume of solution = 409 ml
Amount of Alcohol percentage present in solution = 11%
Find:
Amount of Alcohol volume present in solution
Computation:
Amount of Alcohol volume present in solution = Total volume of solution x Amount of Alcohol percentage present in solution
Amount of Alcohol volume present in solution = 409 x 11%
Amount of Alcohol volume present in solution = 409 x 0.11
Amount of Alcohol volume present in solution = 44.99 ml
Calculate the [H3O+] of an aqueous solution that is 1.94 x 10-7 Min OH.
Enter your answer in scientific notation. Be sure to answer all parts.
_x 10^_M
Help, please :)
What type of bond is being shown here?
A. Single covalent
B. Double covalent
C. Triple covalent
D. None
Answer:
Double bond, Double Covalent
Explanation:
Hope this helps!
When 1 mol of Zn reacts with 0.8 mol of HCI, which of the following will be true?
Answer:
Zn is the excess reagent
Explanation:
mass of 12 helium atom