Thermochemistry Intro

How much heat is produced when 750.0 mL of water is raised from 30°C to 89°C?

• 8.289 Joules

• 160.512 Joules

• 185,142 Joules

• 185.142 Joules

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How many grams of water are needed to raise the temperature by 18°C, and using 345.0 J of energy?

• 4.58 grams

• 4.62 grams

• 4.92 grams

• 5.01 grams

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When a chemical reaction happens and it feels cold, it is an

• Endothermic rxn

• Exothermic rxn

Which will substance will cool down the fastest if they have equal mass and starting temperature?

• copper

• granite

• iron

• basalt

Answer explanation

The LOWER the heat capacity, the faster it will heat up or cool down given the same mass and same starting temperature (it doesn't hold heat as well or is more of a CONDUCTOR than insulator)

Tags

NGSS.MS-PS3-4

Heat flows from _______ to ______ objects

• cooler to warmer

• warmer to warmer

• warmer to cooler

• cooler to cooler

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Temperature is a measure of the...

• total energy in a substance

• heat in a substance

• average potential energy in a substance

• average kinetic energy of molecules in a substance

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What does ΔH symbolize?

• Enthalpy

• Entropy

• Energy

• Matter

Tags

NGSS.HS-PS1-4

A reaction that absorbs heat from the surroundings is

• exothermic

• endothermic

• exogonic

• hydrophobic

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

A reaction that releases heat to the surroundings is

• exothermic

• endothermic

• exogonic

• hydrophobic

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

If object A is larger than object B, but both are the same temperature.

• Object A have more heat than B

• Object A have less heat than B

• Object A & B have same amount of heat