Answers
b:they have a different amount of neutrons
c:protons neutrons and electrons
d: the atom itself would change
Related Questions
Which of these pure substances do you think are Elements?
Au (Gold)
C6H12O6 (Sugar)
Fe (Iron)
NaCl (Salt)
O (Oxygen)
Fe2O3 (Rust)
Answers
The others are compounds
What should be the first thing human try and research/solve with genetics?
Answers
Genetic disorders that are extremally dehabilitating
When does the object change direction?
Distance vs. Time
50
40
30
20
10
c
D
2
6
8
10
Time
F
Answers
Answer:
50distance and 10minutes time
Explanation:
because it's the best object
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-
Answers
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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(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.
Answers
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]
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
Answers
The rate law for an overall reaction is always based on the rate law of the slow step.
What causes a repeating pattern of day and night
Answers
Answer:
Rotation of the Earth causes night and day to alternate. Since we learned that the Earth's axis is tilted and hence the equator is not facing the Sun directly, different places on Earth would experience unequal length of days and nights—not exactly 12 hours of day and 12 hours of night all the time.
Explanation:
Which of the following (H+) values describes a neutral solution?
O 10-1M
O 10-7M
10-14 M
O 10-12M
Answers
Answer:10-^7M
Explanation: this is a neutral solution as the [H+] and [OH-] is of same value ie,10-^7M
What is the definition of a Double Displacement Reaction?
Answers
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.
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
Answers
Answer: The answer is B 1,3
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.
Answers
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
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?
Answers
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.
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.
Answers
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.
what element is solid at room temperature shiny malleable and a good conductor of heat
Answers
Answer:
I believe that it would be copper because copper is all of those things.
Explanation:
Why is the intertidal zone so harsh?
Answers
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
Answers
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
The boiling point of a liquid is the temperature at which its ____________ _____________ is equal to ____________ ____________.(atmospheric pressure, vapor pressure
Answers
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)
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
Answers
How many moles are in 212.46 grams of H2SO4?
Answers
Answer:
2.16622443577839
Explanation:
Answer:
It would be 2.16622443577839.
Explanation:
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.
Answers
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
About what percent of the Earth is covered in salt water oceans?
A.84%
B.71%
C.49%
D.65%
Answers
Answer:
B
Explanation:
Which of the following is the most important reason for people to carefully manage natural resources?
A.) Recycling facilities are being constructed around the world.
B.) Underground reserves of oil have not yet been discovered.
C.)Technology that uses natural resources more efficiently are being developed.
D.)The growing human population is putting increasing demands on natural resources.
Answers
Answer:
The growing human population is putting increasing demands on natural resources.
Explanation:
In an ecosystem, the most important reason for people to carefully manage natural resources is that the growing human population is putting increasing demands on natural resources.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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What is the concentration of a solution with a volume of 2.50 liters containing 630. grams of calcium phosphate, Ca3(PO4)2?
Answers
Answer:
L=0.85M
Explanation:
ca3 (po4)
66gX1mol/310.18g=2.2178mol/2.5
intrusive igneous rock forms when the cooling of magma takes place fast on the top of the Earth's surface. A. True B. False
Answers
Answer:
A
Explanation:
True igneous rock forms cooling of magma fast on the top
Answer:
The answer is A. True
Explanation:
This transition metal is in group 12 and has less than 34 protons
Answers
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."
What is electroluminescence? Give one example.
Answers
Answer:
electroluminescence is a production of light by the flow of electrons, as within certain crystals. An example is at most resataurants with a bright sign that either says open or closed.
Explanation:
What is the weight percentage of NaOH?
Answers
A cube, with a mass of 21 g is dropped in a graduated cylinder with 10 mL
water. The water level rises to 24 mL when the cube is added. What is the
cube's density (don't forget units)
Answers
Answer:55ml
Explanation:
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? _______________________________
Answers
Answer: 130g , 40g , 70g
Explanation:
why do men
thats it that’s the question
Answers
Explanation:
babe I wish I knew I would tell you
Answer:
Not all men are like this. It depends on how they were raised