Chemistry ! 5 questions

Chemistry

1 answer:

tangare [24]4 years ago

8 0

1) - dissolving ammonium nitrate in water to cool the water.

2) Pressure

3) - a liquid with a high specific heat

4) -Melting ice cubes

5) - the enthalpy is positive

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Which word describes AH for exothermic reactions?<br> O negative<br> O small<br> positive<br> O zero

Leokris [45]

Answer:

negative

Explanation:

Exothermic reaction - energy is out of system, so energy of system becomes smaller, and ΔH<0.

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3 years ago

What is the predicted outcome for very low mass stars (those that are smaller than about the mass of the sun)?

White raven [17]

Answer:

In case of low-mass stars,the outer layers of the low mass stars are expelled as the core collapses such that the outer layers form a planetary nebula.

Explanation:

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The atomic number is the same as the amount of electrons and protons. For example:
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Hydrogens atomic number is 1 so the proton and electron count is 1.

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3 years ago

Which unit of measurement should you use when measuring the length of an earthworm?

MrMuchimi

Answer:

kilometers.........

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3 years ago

In a lab in New York, Thomas and Nikola collected data over several trials. Thomas recorded his measurements as 10.0 A, 11 A, an

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Nikola's reading has a lower range and it is logical to conclude that his reading is more precise.

Explanation: