3 years ago

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Chemistry

1 answer:

Orlov [11]3 years ago

7 0

Explanation:

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Equation 3x-5=-2x+ 10? O 0 x= 5 -5 = x -15 = -5x -5x = 15

Harman [31]

Answer:

are those the answer choice

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3 years ago

Which chemical reaction needs more energy to break bonds in the reactants

MA_775_DIABLO [31]

Answer:An endothermic reaction

Explanation: In an endothermic reaction, it takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed. In an endothermic reaction, the temperature goes down.

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What is the Ka of a weak acid (HA) if the initial concentration of weak acid is 4.5 x 10-4 M and the pH is 6.87? (pick one)

rewona [7]

Answer:

Ka = $4.04 \times 10^{-11}$

Explanation:

Initial concentration of weak acid = $4.5 \times 10^{-4}\ M$

pH = 6.87

$pH = -log[H^+]$

$[H^+]=10^{-pH}$

$[H^+]=10^{-6.87}=1.35 \times 10^{-7}\ M$

HA dissociated as:

$HA \leftrightharpoons H^+ + A^{-}$

(0.00045 - x) x x

[HA] at equilibrium = (0.00045 - x) M

x = $1.35 \times 10^{-7}\ M$

$Ka = \frac{[H^+][A^{-}]}{[HA]}$

$Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 - 0.000000135}$

0.000000135 <<< 0.00045

$Therefore, Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 } = 4.04 \times 10^{-11}$

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3 years ago

What is the ratio of phosphorous atoms to oxygen atoms

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2:5 is the answer have a awesome day

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When an acid like HCl dissociates in water, it essentially is ________.Select one:a. making the water more basicb. raising the p

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1) Acidic solution. An acidic solution has a high concentration of H+ ions.

2) Basic solution. A basic solution has a high concentration of OH- ions.

3) HCl chemical reaction.

$HCl+H_2O\rightarrow H_3O^++Cl^-$

You can also write it as follows

$HCl+H_2O\rightarrow H^++Cl^-$

4) pH scale.

When the concentration of H+ is high, the solution is acidic. H+ lowers the pH of the solution.

Option D.

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1 year ago