Thermochemistry

On a heat curve, what is changing along the diagonal lines?

• temperature

• phase

• potential energy

• state

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How many Joules of energy are required to make 100 grams of ice at 0 ^οC completely melt? Ice has a heat of fusion of 334 J/g.

• 200 J

• 400 J

• 33,400 J

• 226,000 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Calculate the amount of energy required to boil 98.0 grams of liquid water. The heat of vaporization of water is 2260 J/g.

• 221,480 J

• 23 J

• 32,732 J

• 2260 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

On the given heating curve, what is the substance's boiling point in °C?

• -60

• 60

• -100

• 100

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

On this heat curve, which line segment represents only the solid state?

• AB

• BC

• CD

• DE

Tags

NGSS.MS-PS1-4

The specific heat of Copper is 0.385 J/g °C. How much heat is required to raise the temperature of 23 g of copper from 20 °C to 50 °C?

• 266 J

• 620 J

• 1792 J

• 133 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How much heat is required to heat 5 g of mercury from 25 °C to 35 °C?

• 7 J

• 25 J

• 18 J

• 678 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

You have 125 g of an unidentified substance. When you heat it from 25 °C to 60 °C it gives off 5478 J of heat. What is the specific heat of your substance?

• 1.75 J/g °C

• 0.89 J/g °C

• 1.25 J/g °C

• 0.50 J/g °C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The heat absorbed or released during a chemical reaction is

• heat of fusion

• heat of vaporization

• enthalpy

• specific heat

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-6

NGSS.MS-PS3-4

Energy is stored when chemical bonds are (1) and energy is released when chemical bonds are (2).

• 1-formed, 2-broken

• 1-broken, 2-formed

• 1-heated, 2-cooled

• 1-cooled, 2-heated

Tags

NGSS.MS-PS3-2