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2 years ago

I NEED HELP ANSWERING THESE QUESTIONS FOR 50 POINTS!!!!!

Chemistry

2 answers:

Semmy [17]2 years ago

7 0

The answers are true, true, false, true, and false.

dmitriy555 [2]2 years ago

3 0

Answer:

true true false true and true false

Explanation:

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Nataliya [291]

Answer:

1.) increases

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2 years ago

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Explain how you can use an atoms mass number and atoic number to determine the number of protrons electrons and neutrons in the

VMariaS [17]

Simple!

Atomic number= number of protons AND number of electrons (in an atom)

Mass number= number of neutrons

7 0

3 years ago

Acetylsalicylic acid (aspirin), HC9H7O4, is the most widely used pain reliever and fever reducer. Find the pH of 0.035 M aqueous

KatRina [158]

The pH of 0.035 M aqueous aspirin is 2.48

Explanation:

We are given:

Concentration of aspirin = 0.035 M

The chemical equation for the dissociation of aspirin (acetylsalicylic acid) follows:

$HC_9H_7O_4\rightleftharpoons H^++C_9H_7O_4^-$

Initial: 0.035

At eqllm: 0.035-x x x

The expression of $K_a$ for above equation follows:

$K_a=\frac{[C_9H_7O_4^-][H^+]}{[HC_9H_7O_4]}$

We are given:

$K_a=3.6\times 10^{-4}$

Putting values in above expression, we get:

$3.6\times 10^{-4}=\frac{x\times x}{(0.035-x)}\\\\x=-0.0037,0.0033$

Neglecting the value of x = -0.0037 because concentration cannot be negative

So, concentration of $H^+$ = x = 0.0033 M

To calculate the pH of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

$H^+$ = 0.0033 M

Putting values in above equation, we get:

$pH=-\log(0.0033)\\\\pH=2.48$

Hence, the pH of 0.035 M aqueous aspirin is 2.48

7 0

3 years ago

Based on this chart, what percentage of energy comes from fossil fuels?

Julli [10]

Answer:

37%+24%+23%=84% , i wish my answer is correct

8 0

3 years ago

A chemist measures the energy change Delta H during the following

Ann [662]

Answer: 1) endothernic

2) Yes absorbed

Explanation:

Decomposition is a chemical reaction in which one reactant gives two or more than two products. All decomposition reactions are endothermic reactions as energy is absorbed to break the bonds.

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and $\Delta H$ for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and $\Delta H$ for the reaction comes out to be negative.

5 0

2 years ago