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liq [111]
4 years ago
5

What is matter,atom, molecules,​

Chemistry
1 answer:
kotegsom [21]4 years ago
8 0

Explanation:

Matter: the thing that forms physical objects and occupies space

Atom:the smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule

molecule: the smallest possible amount of a particular substance that has all the characteristics of that substance

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Which change of state is shown in the model?
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D

Explanation:

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What is the % of water in (MgSO4 . 2H2O)?
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Answer: A hydrate is found to have the following percent composition: 48.8% MgSO4 and 51.2% water.

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Which of the following liquids is most volatile? Select one: a. cooking oil b. motor oil c. alcohol d. water
LenaWriter [7]

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Alcohol.

Explanation:

It has the lowest boiling point and high vapour pressure.

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3 years ago
A hypothetical substance has a melting point of −10°C and a boiling point of 155°C. If this substance is heated from 2°C to the
likoan [24]

Answer:

Option 3. Specific heat capacity of the liquid

Explanation:

Let's think, the states for the substance.

In -10, substance turns from solid state to liquid, so at 2°C , state is liquid.

We have to take from liquid state at 2°C to 155°C, which is the boiling point.

As the substance doesn't change its state, we only have to apply the specific heat capacity of the liquid.

1. specific heat capacity of the solid → This is used, when the substance is solid.

2. Heat of fusion → Only used when you turn from liquid to solid

4. Heat of vaporization → Used when the substance changes its state from liquid to gas

5. specific heat capacity of the gas → Used when the substance is a gas.

8 0
4 years ago
1826.5g of methanol (CH3OH), molar mass = 32.0 g/mol is added to 735 g of water, what is the molality of the methane 0.0348 m 1.
Snowcat [4.5K]

Answer:

Molality = 1.13 m

Explanation:

Molality is defined as the moles of the solute present in 1 kilogram of the solvent.

Given that:

Mass of CH_3OH = 26.5 g

Molar mass of CH_3OH = 32.04 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{26.5\ g}{32.04\ g/mol}

Moles\ of\ CH_3OH= 0.8271\ moles

Mass of water = 735 g = 0.735 kg ( 1 g = 0.001 kg )

So, molality is:

m=\frac {0.8271\ moles}{0.735\ kg}

<u>Molality = 1.13 m</u>

4 0
3 years ago
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