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Viefleur [7K]
3 years ago
5

PLEASE ANSWER FAST AND YOU WILL GET 15 POINTS AND BRAINLIEST if you answer both questions

Chemistry
1 answer:
nika2105 [10]3 years ago
8 0

Answer:

1. C. Lithosphere

2. A. Earthquakes

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Determine the ph of a 0.500 m hno2 solution. Ka of hno2 is 4.6 × 10−4.
Mumz [18]

Answer: pH of a 0.500 M HNO_2 solution is 1.82

Explanation:

HNO_2\rightarrow H^++NO_2^-

 cM              0             0

c-c\alpha        c\alpha     c\alpha     

So dissociation constant will be:

K_a=\frac{(c\alpha)^{2}}{c-c\alpha}

Give c= 0.500 M and \alpha = ?

K_a=4.6\times 10^{-4}

Putting in the values we get:

4.6\times 10^{-4}=\frac{(0.500\times \alpha)^2}{(0.500-0.500\times \alpha)}

(\alpha)=0.030

[H^+]=c\times \alpha

[H^+]=0.500\times 0.030=0.015

Also pH=-log[H^+]

pH=-log[0.015]=1.82

Thus pH of a 0.500 M HNO_2 solution is 1.82

3 0
3 years ago
Trans-4-hexen-3-ol can be synthesized starting from acetaldehyde. One of the key reagents is ethyl grignard.
salantis [7]

find the given attachment

4 0
3 years ago
How do you test oxygen​
AleksandrR [38]

Answer:

The glowing splint test is a test for an oxidizing gas, such as oxygen. In this test, a splint is lit, allowed to burn for a few seconds, then blown out by mouth or by shaking. Whilst the ember at the tip is still glowing hot, the splint is introduced to the gas sample that has been trapped in a vessel. Oxygen supports combustion so a good method of testing for oxygen is to take a glowing splint and place it in a sample of gas, if it re-ignites the gas is oxygen. This is a simple but effective test for oxygen.

4 0
3 years ago
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If a 25 kg car accelerates at a speed of 100 m/s², what will the force of the car be?
igomit [66]

Answer:

<h2>The answer is 2500 N</h2>

Explanation:

The force acting on an object given it's mass and acceleration is given by

<h3>Force = mass × acceleration</h3>

From the question

mass of car = 25 kg

acceleration = 100 m/s²

The force is

Force = 25 × 100

We have the final answer as

<h3>2500 N</h3>

Hope this helps you

5 0
4 years ago
When you heat a liquid, the molecules spread farther apart and the liquid expands, and when you cool a liquid, the molecules get
ale4655 [162]

Answer:

the water is diffrent because it is now a gas not a liquid

Explanation:

4 0
4 years ago
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