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4 years ago

Select the correct answer.

Chemistry

2 answers:

Dima020 [189]4 years ago

5 0

Answer:

C. Their components can be separated by physical processes.

Explanation:

Eddi Din [679]4 years ago

4 0

Answer:

C. Their components can be separated by physical processes.

Explanation:

The components of any mixture can be separated by physical means.

A. is wrong. This is a property of heterogeneous mixtures.

B. is wrong. This is a property of compounds.

D. is wrong. For example, air is a mixture of gases and brass is a mixture of solids.

E. is wrong. Only elements and compounds are pure substances.

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How do you assume the help position to reduce heat loss in cold water?.

torisob [31]

Crossing your arms across the chest and pulling the knees up to your chest is how the HELP position is achieved.

<h3>What is HELP position?</h3>

This is referred to as heat escape lessening position and reduces heat loss in individuals when in cold water.

This position helps to protect groin, head/neck, and rib cage/armpits areas of the body.

Read more about Heat loss here brainly.com/question/6850851

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6 0

2 years ago

Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin pla

RSB [31]

<u>Answer:</u> The enthalpy change of the reaction is -27. kJ/mol

<u>Explanation:</u>

To calculate the mass of water, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Density of water = 1 g/mL

Volume of water = 25.0 mL

Putting values in above equation, we get:

$1g/mL=\frac{\text{Mass of water}}{25.0mL}\\\\\text{Mass of water}=(1g/mL\times 25.0mL)=25g$

To calculate the heat released by the reaction, we use the equation:

$q=mc\Delta T$

where,

q = heat released

m = Total mass = [1.25 + 25] = 26.25 g

c = heat capacity of water = 4.18 J/g°C

$\Delta T$ = change in temperature = $T_2-T_1=(21.9-25.8)^oC=-3.9^oC$

Putting values in above equation, we get:

$q=26.25g\tiimes 4.18J/g^oC\times (-3.9^oC)=-427.9J=-0.428kJ$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of ammonium nitrate = 1.25 g

Molar mass of ammonium nitrate = 80 g/mol

Putting values in above equation, we get:

$\text{Moles of ammonium nitrate}=\frac{1.25g}{80g/mol}=0.0156mol$

To calculate the enthalpy change of the reaction, we use the equation:

$\Delta H_{rxn}=\frac{q}{n}$

where,

q = amount of heat released = -0.428 kJ

n = number of moles = 0.0156 moles

$\Delta H_{rxn}$ = enthalpy change of the reaction

Putting values in above equation, we get:

$\Delta H_{rxn}=\frac{-0.428kJ}{0.0156mol}=-27.44kJ/mol$

Hence, the enthalpy change of the reaction is -27. kJ/mol

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4 years ago

Which statement describes the light reaction of photosynthesis?

cupoosta [38]

Answer:

Explanation:

water molecules are combined to make food

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3 years ago

Please help me I'm so confused

iogann1982 [59]

Answer:

105m/3hourz

Explanation:

35 miles per hour, so 3 hours

35x3=105 per 3 hours

6 0

3 years ago

Specific heat is defined as the amount of heat in what

GenaCL600 [577]

Answer:

Specific heat is the amount of energy that must be added, in the form of heat, to one unit of mass of the substance in order to cause an increase of one unit in temperature.

Explanation:

8 0

3 years ago

Read 2 more answers