Dihydrogen sulfide reacts with oxygen gas to form sulfur dioxide and water. How many moles of oxygen gas will react when 0.6469 moles of water are formed?
Answer: 0.9704 moles of [tex]O_2[/tex] will react when 0.6469 moles of water are formed.
Explanation:
The balanced chemical reaction is:
[tex]2H_2S+3O_2(g)\rightarrow 2SO_2+2H_2O[/tex]
According to stoichiometry :
2 moles of [tex]H_2O[/tex] are formed from = 3 moles of [tex]O_2[/tex]
Thus 0.6469 moles of [tex]H_2O[/tex] are formed from =[tex]\frac{3}{2}\times 0.6469=0.9704moles[/tex] of [tex]O_2[/tex]
Thus 0.9704 moles of [tex]O_2[/tex] will react when 0.6469 moles of water are formed.
Which of these pure substances do you think are Elements?
Au (Gold)
C6H12O6 (Sugar)
Fe (Iron)
NaCl (Salt)
O (Oxygen)
Fe2O3 (Rust)
The process that is the opposite of sublimation is called deposition. Use the example of frost formation to infer why this process has this name.
Answer:
See explanation
Explanation:
Sublimation refers to the movement of molecules directly from solid into the vapor or gas phase while deposition refers to the movement of molecules directly from the gas phase into the solid phase. The two are opposite to each other.
Frost is formed in a situation where a substance cools to a temperature that is lower than its dew point. In this situation, the vapour is directly deposited on a surface to form a frost without passing through a liquid phase. Hence the name, deposition.
(b) Which solution has a higher percent ionization of the acid, a 0.10M solution of HC2H3O2(aq) or a 0.010M solution of HC2H3O2(aq) ? Justify your answer including the calculation of percent ionization for each solution.
Answer: The percent ionization is higher for 0.010 M solution of [tex]HC_2H_3O_2[/tex]
Explanation:
[tex]HC_2H_3O_2\rightarrow H^+C_2H_3O_2^-[/tex]
cM 0M 0M
[tex]c-c\alpha[/tex] [tex]c\alpha[/tex] [tex]c\alpha[/tex]
So dissociation constant will be:
[tex]K_a=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]
a) Given c= 0.10 M and [tex]\alpha[/tex] = ?
[tex]K_a=1.8\times 10^{-5}[/tex]
Putting in the values we get:
[tex]1.8\times 10^{-5}=\frac{(0.10\times \alpha)^2}{(0.10-0.10\times \alpha)}[/tex]
[tex](\alpha)=0.013[/tex]
[tex]\%(\alpha)=0.013\times 100=1.3\%[/tex]
b) Given c= 0.010 M and [tex]\alpha[/tex] = ?
[tex]K_a=1.8\times 10^{-5}[/tex]
Putting in the values we get:
[tex]1.8\times 10^{-5}=\frac{(0.010\times \alpha)^2}{(0.010-0.010\times \alpha)}[/tex]
[tex](\alpha)=0.041[/tex]
[tex]\%(\alpha)=0.041\times 100=4.1\%[/tex]
The percent ionization is higher for 0.010 M solution of [tex]HC_2H_3O_2[/tex]
A gas has a of 590 mi. At a temperature What volume will the gas occupy at 30.0öc.1 Which gas law is this
The given question is incomplete. The complete question is:
A gas has a volume of 590 ml at a temperature of [tex]0^0C[/tex].What volume will the gas occupy at [tex]30.0^0C[/tex]. Which gas law is this?
Answer: 655 ml , Charle's Law
Explanation:
To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.
[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.
We are given:
[tex]V_1=590ml\\T_1=0^oC=(0+273)K=273K\\V_2=?\\T_2=30.0^0C=(30+273)K=303K[/tex]
Putting values in above equation, we get:
[tex]\frac{590}{273}=\frac{V_2}{303}\\\\V_2=655ml[/tex]
Thus the volume at [tex]30.0^0C[/tex] is 655 ml
This transition metal is in group 12 and has less than 34 protons
Zinc (Zn) has less than 34 protons, 30 to be exact, and is a transition metal in Group 12. Note: it is also called a "post-transition metal."
When does the object change direction?
Distance vs. Time
50
40
30
20
10
c
D
2
6
8
10
Time
F
Answer:
50distance and 10minutes time
Explanation:
because it's the best object
An ionic compound is found to contain 28.9% potassium, 23.7% sulphur and 47.4% oxygen.
The relative formula mass of the compound is 270. What is the formula of the compound?
Answer:
K2S2O8
Explanation:
The method is attached above.
What is the concentration of a solution with a volume of 2.50 liters containing 630. grams of calcium phosphate, Ca3(PO4)2?
Answer:
L=0.85M
Explanation:
ca3 (po4)
66gX1mol/310.18g=2.2178mol/2.5
what is the molar mass of wax (C25H52)?
(hydrogen- 1.01)
(carbon- 12.01)
The molar mass of wax with chemical formula is C₂₅H₅₂ is 352.77 grams per mole.
What is chemical formula?Chemical formula is defined as a way of representation of the number of atoms which are present in a compound or a molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called as an empirical formula.
It is not the same as structural formula and does not have any information regarding structure of the compound..It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
Molar mass of wax is calculated as , 12.01×25+1.01×52=352.77 grams per mole.
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What is the weight percentage of NaOH?
Calculate the amount of heat lost by 23 g of water when its temperature drops from 68.0°C to 31.0°C. The specific heat of water is 4.18 J/(g°C).
Answer:
3557J is the heat lost by the water
Explanation:
Using the equation:
Q = m*C*ΔT
Where Q is change in heat
m is mass of substance (23g of water)
C is specific heat of the substance (4.18J/g°C)
And ΔT is change in temperature (68.0°C - 31.0°C = 37.0°C)
we can find the amount of heat lost as follows:
Q = 23g*4.18J/g°C*37°C
Q =
3557J is the heat lost by the water
a tiger cub has a pattern on his fur what cell do he get it from
Answer: The Melanocyte cell provides color of fur in animals.
Explanation:
Answer:
GO RIGHT HERE https://quizizz.com/admin/quiz/5dd7509e5c6f0b002050037c/staar-catalyst-1
Explanation:
What volume of hydrogen is necessary to react with 6.25g of nitrogen to produce ammonia?
(Assume constant temperature and pressure.)
A. 30L
B. 15L
C. 6.2L
D. 12.5L
If you hold a backpack in your hand, the force of gravity pulls it downward. What force keeps it from falling to the ground?
Answer:
The force of the gases pushes downward at the same time that the gases push the rocket upwards. 1.
Explanation:
Which of the following pairs of substances form a buffer system for human blood?
A.
HCl and Cl-
B.
NH3 and NH2-
C.
H3C6H5O7 and HC6H5O72-
D.
H2CO3 and HCO3-
Answer:
d. Because those chemicals are easily made when CO2 reacts with water, forming H2CO3 (via carbonic anhydrase
The pairs of substances form a buffer system for human blood is carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻) , Option D
What is a Buffer Solution ?
A buffer is a combination of a weak acid (or base) and a salt that contains the conjugate of that weak acid or base.
A buffer solution is added to maintain the pH of any solution
The buffer of carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻) is used to maintain the balance of acid and base in the body.
It is used to maintain the pH level of the body between 7.35 and 7.45 , as the pH level higher than 7.8 and lower than 6.8 can lead to death.
Therefore the pairs of substances form a buffer system for human blood is carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻) , Option D
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5. What mass of the following solutes will dissolve in 100 ml of water?
KNO3 at 50o C? ______________________________
NH4Cl at 50o C? _________________________________
NaNO3 at 50o C? _______________________________
Answer: 130g , 40g , 70g
Explanation:
5. Which set of coefficients will balance this chemical
equation?
_C2H4(g) +
O2(g) → 2CO2(g) + 2H2O(g)
A. 1.2
B. 1.3
C. 2.3
D. 2.5
Answer: The answer is B 1,3
Would you see more living things in a Biome or an Ecosystem?
Answer:
A Biome is way bigger than a ecosystem
Explanation:
answer: biome
because many ecosystems can make up a single biome.
intrusive igneous rock forms when the cooling of magma takes place fast on the top of the Earth's surface. A. True B. False
Answer:
A
Explanation:
True igneous rock forms cooling of magma fast on the top
Answer:
The answer is A. True
Explanation:
What is the definition of a Double Displacement Reaction?
Answer:
A double displacement is a type of chemical reaction that in which the reactant ions exchange places to form new products
Explanation:
I took the quiz
Answer:
When two different atoms or groups of atoms are exchanged, then it is a double displacement reaction.
Which of the following statements is true about a light-year?
A) It is the distance to Alpha Centauri.
B) It is shorter than the astronomical unit.
C) It is used to measure long periods of time.
D) It is used to measure long distances in space.
Answer:
D
Explanation:
Answer:
I pretty sure its D
Explanation:
because I dont think that it measures long periods of time I could be wrong tho if I am I'm sorry
Which of the following (H+) values describes a neutral solution?
O 10-1M
O 10-7M
10-14 M
O 10-12M
Answer:10-^7M
Explanation: this is a neutral solution as the [H+] and [OH-] is of same value ie,10-^7M
Which of the following is NOT an example of proxy data?
A Fossils including pollen and leaves
B Corals
C weather data collected by sending weather balloons up in the atmosphere
D Ice cores
E Tree rings
Answer:
itz e
Explanation:
Weather data collected by sending weather balloons up in the atmosphere
is not an example of proxy data.
Proxy data is the data which is collected by scientists known as
paleoclimatologists from people who record climatic variations. The data
collected usually helps to shed more light on the climatic history of a place.
It is also used to identify the organism and tells its origin. Examples of proxy
data include fossils including pollen and leaves,corals, ice cores, tree rings
etc.
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Why is the intertidal zone so harsh?
What should be the first thing human try and research/solve with genetics?
Genetic disorders that are extremally dehabilitating
Use the information and table to answer the following question.
Scientists use either a melting år freezing point apparatus to determine the melting points of the following unknown compounds as part of
their investigation. Based on the melting points, the scientists determine the bond type and record the results in the table as shown.
Unknown Compound
Compound 1
Exhibits
Compound 2
Compound 3
Compound 4
Melting Point
772°C
17°C
960°C
-56°C
Which statement correctly identifies the ionic compounds and why?
A Compounds 1 and 3 are lonic. Because covalent compounds are composed of oppositely charged ions that are attracted to one
another, they require more energy to melt than ionic bonds.
O B. Compounds 2 and 4 are ionic. Because covalent compounds are composed of oppositely charged ions that are attracted to one
another, they require more energy to melt than ionic bonds.
C. Compounds 2 and 4 are ionic. Because ionic compounds are composed of oppositely charged ions that are attracted to one another,
they require more energy to melt than covalent bonds,
D. Compounds 1 and 3 are ionic. Because ionic compounds are composed of oppositely charged ions that are attracted to one another,
they require more energy to melt than covalent bonds.
Answer:
Explanation:
are you doing your mid term?well i got c
Answer:
D
Explanation:
Compounds 1 and 3 are lonic.Because ionic compounds are composed of oppositely charged ions that are attracted to one another,
they require more energy to melt than covalent bonds. just usign he process of elimination you get rid of A and B becuase covalant compound contaIN same negatively charged particles that contain requrie less energy to melt and since two and four have low melting point its d
Consider the following representation of a reaction mechanism.
Step 1: A+A → C+E (slow)
Step 2: E + B → A+D (fast)
Overall reaction: A + B → C + D
What should appear in the rate law for the reaction above?
A) only A and B because they are reactants in the overall reaction
B) only C and C because they are products in the overall reaction
C) only A because it is the reactant in the rate-determining step
D) only E and B because they are the reactants in the rate-determining step
The boiling point of a liquid is the temperature at which its ____________ _____________ is equal to ____________ ____________.(atmospheric pressure, vapor pressure
Answer:
vapor pressure, atmospheric pressure
Explanation:
the boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it.
(I'm not too sure if this is right but I think it is)
Group 2, Period 6
whats the answer for this please it's on the periodic table
Answer:
Group 2, Period 6
Barium (Ba)
Explanation: