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3 years ago

What is the most useful tool used by chemist?

1 answer:

6 0

<span> a distillation apparatus is, by far, the most useful tool in the toolbox. It’s most basic use allows you to separate chemicals based on their boiling points. That alone is cool. It also allows you to manufacture chemicals by forcing reactions that wouldn’t otherwise occur and reflux reactions that would otherwise take gallons of reactants.</span>

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2. An exothermic reaction releases 86.5 kJ. How many kilocalories of<br> energy are released?

Alenkasestr [34]

Answer:

20.67 kcal of energy is released.

Explanation:

It is given that, an exothermic reaction releases 86.5 kJ. We need to convet kJ to calories.

Since,

1 kcal = 4.184 kJ

So,

1 kJ = 0.239 kcal

For 86.5 kJ,

86.5 kJ = (0.239 × 86.5) kcal

86.5 kJ = 20.67 kcal

So, 20.67 kcal of energy is released.

7 0

3 years ago

An example of a solid solution is copper true or false

garik1379 [7]

This is false, because copper is an element.
To be solution, it has to have at least 2 different substances. Solid solution of metals is often called alloy.

4 0

4 years ago

1.The movement of particles from a less crowded area to a more crowded area requires

Harrizon [31]

1. Energy as particles can't move without kinetic (movement) energy
2. I think it's Diffusion and Active Transport

7 0

3 years ago

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon C , how many atoms of carbon C should be in the prod

pochemuha

B. 6 atoms of carbon C
I would think this is the answer, because one can't just delete or add atoms; otherwise, the equation would be unbalanced. This also abides with the Law of Conservation of Mass.

Plus, I also came to that conclusion because if we look at the net equation of photosynthesis:
$6C O_{2} + 6H_{2}O$ ––> $C_{6}H_{12}O_{6} + 6O_{2}$
The number of Carbon atoms is 6 on both the reagent's side and the product's side.

8 0

3 years ago

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Which of the following observations indicates that an atom has neutrons?

olganol [36]

Answer:

The correct answer is C: A radiation consisting of uncharged particles is emitted when alpha particles strike beryllium atoms.

Explanation:

Chadwick discovered neutron while experimenting with a gold foil. A stream of alpha particles produced from a polonium source was directed at beryllium target. It was noticed that some penetrating radiations were produced. These uncharged particles were called neutrons because on the charge detector these particles showed no deflection.

Their nuclear reaction is as follow.

₂He + ₄Be ----------> ₀n + ₆C

Chadwick noticed that neutrons cannot ionize gases and are highly penetrating particles.

8 0

4 years ago

Read 2 more answers