Thermochem

Convert 1365.4 J into kcal

• 0.32634 kcal

• 326.34 kcal

• 5.7128 kcal

• 5712.8 kcal

How much heat (in Joules) is needed to raise the temperature of 257g of ethanol (c_ethanol=2.4 J/g°C) by 49.1°C?

• 620 J

• 3.0 x 10^4 J

• 30285 J

• 3.02 x 10^3 J

Tags

NGSS.HS-PS3-4

How many kilojoules of heat are required to heat 1.37 kg of water from 21.3°C to 89.5°C?

• 5.73 kJ

• 0.391 kJ

• 391 kJ

• -390 kJ

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

How much heat, in calories, is needed to raise the temperature of 125.0 g of Lead (c_lead= 0.130 J/g°C) from 17.5°C to 41.1°C?

• 2950 cal

• 383.5 cal

• -91.66 cal

• 91.7 cal

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What mass of iron (c_iron= 0.11 cal/g°C) would need 1450 cal of energy in order to raise its temperature by 19.7°C?

• 670 g

• 3140 g

• 259000 g

• 8.10 g

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What is the final temperature of a samples of nickel (c_nickel= 0.54 J/g°C) if 328 J of energy is added to a 16.7g sample at an initial temperature of 24.4°C?

• 36 C

• 60 C

• 2960 C

• 19.6 C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What is the specific heat of an unknown metal if 1.67 kcal of energy are required to raise the temperature of 79.2 g sample of the metal by 63.3°C?

• 132.3 cal/gC

• 0.000333 cal/gC

• 1.33 cal/gC

• 0.333 cal/gC

When heat energy is added the speed of the molecules _____.

• Increase

• Decrease

• Heat

• Stays the same

Tags

NGSS.MS-PS1-4

Stored energy in chemical bonds

• Specific Heat

• Heat

• Chemical potential energy

• Equilibrium

Tags

NGSS.HS-PS1-4

The study of heat changes that occur during chemical and physical changes

• Energy

• Exothermic

• Heat

• Thermochemistry

Tags

NGSS.HS-PS3-4