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yaroslaw [1]
2 years ago
11

A change in state (phase change) occurs when thermal energy is added or taken away from a system.

Chemistry
2 answers:
Irina18 [472]2 years ago
8 0
True

a change of state occurs when thermal energy is added or taken away from a system.
tekilochka [14]2 years ago
3 0

Answer:

true

Explanation:

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Fundamental differences in the cell, the basic unit of life, allow for broadest classification of all living organisms into thre
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Ethanedioic acid, a compound that is present in many vegetables, has a molar mass of 90.04 g/mol and a composition of 26.7% Carb
aleksandrvk [35]

Answer:

Empirical CHO2

Molecular C2H2O4

Explanation:

To determine the formulas, firstly, we need to divide the percentage compositions by the atomic masses.

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C = 26.7/12 = 2.225

H = 2.2/1 = 2.2

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We then proceed to divide by the smallest value which is 2.2 in this case

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H = 2.2/2.2 = 1

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Thus, the empirical formula is CHO2

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4 0
3 years ago
Two ice skaters push off against one another starting from a stationary position. The 45.0-kg skater acquires a speed of 0.375 m
zalisa [80]

Answer:

The speed of the 60.0 kg skater should be 0.281 m/s

Explanation:

<u>Step 1: </u>Data given

Mass of skater 1 = 45.0 kg

speed of skater 1 = 0.375 m/s

Mass of skater 2 = 60.0 kg

<u>Step 2:</u> Calculate the speed of skater 2

To solve this problem, we will use 'Conservation of momenton'. This means  the momentum before the push equals the momentum after.

momentum p = m*v

Momentum p(before) = momentum p(after)

m1*v1 = m2 * v2

⇒ with m1 = mass of skater 1 = 45.0 kg

⇒ with v1 = the velocity of skater 1 = 0.375 m/s

⇒ with m2 = the mass of skater 2 = 60.0 kg

⇒ with v2 = the velocity of skater 2 = TO BE DETERMINED

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The speed of the 60.0 kg skater should be 0.281 m/s

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