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4 years ago

HELP PLEASE!!!! 15 POINTS!!! HELP!!

Chemistry

2 answers:

Elis [28]4 years ago

6 0

Answer:

You want a chemical that absorbs energy because it needs to absorb heat energy and quickly cool the contents of the pack.

damaskus [11]4 years ago

6 0

Answer:

Absorb energy.

Explanation:

If you wanted to make a cold pack that absorbs heat (aka an endothermic reaction), then you'd want to use a chemical that absorbs energy. This would absorb the heat. Hope this helped :)

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1.which of the following correctly describes carbon, represented by c?

Gnoma [55]

1 is an element, 2 is an compound

8 0

3 years ago

What does Le Châtelier's principle state?

Rudiy27

Answer:

B. A reaction at equilibrium will respond to balance a change.

Explanation:

The Le Chatelier's principle states that a reaction will respond to balance a change. This is true for a reaction in chemical equilibrium.

Le Chatelier's principle sates that "if any conditions of a system in equilibrium is changed, the system will adjust itself in order to annul the effect of the change".

It explains the effect of applying stress on any system in equilibrium.
The changing conditions are usually concentration, temperature and pressure.
If the stress due to any of them is applied to a system in equilibrium, the equilibrium will respond in the directions which counteracts the effect of the stress.

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3 years ago

For the first order process: AB The half-life of A is 62.1 seconds. If a sample of A initially has 250.0 g, what mass (in g) of

vodomira [7]

<u>Answer:</u> The mass of sample A after given time is 99.05 g.

<u>Explanation:</u>

All the radioactive reactions follows first order kinetics.

The equation used to calculate half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

We are given:

$t_{1/2}=62.1s$

Putting values in above equation, we get:

$k=\frac{0.693}{62.1}=0.011s^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $0.011s^{-1}$

t = time taken for decay process = 84.2 s

$[A_o]$ = initial amount of the reactant = 250 g

[A] = amount left after decay process = ?

Putting values in above equation, we get:

$0.011s^{-1}=\frac{2.303}{84.2s}\log\frac{250}{[A]}$

$[A]=99.05g$

Hence, the mass of sample A after given time is 99.05 g.

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3 years ago

What condition is often confused with the early stages of carbon monoxide poisoning boat ed?

Alex Ar [27]

Early stages of carbon monoxide poisoning is often confused with seasickness or intoxication.

This is so because some symptons of carbon monoxide (CO gas) poisoning are: irritated eyes, headache, nause, weakness and dizziness. As you can see those symptons are common to seasickness and intoxitation.

Carbon monoxide (CO gas) is colorless and odorless, so it may be difficult to detect the exposure to it before having some symptons of CO poisoning, but it is serious and can result in death. The victim shall be conducted to an open place promptly to receive fresh air and carried to a hospital to receive treatment urgently.

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3 years ago

The lowest whole number ratio of ions

Sveta_85 [38]

Forumla unit is your answer.

6 0

3 years ago