Thermochemistry Intro

A reaction that absorbs heat from the surroundings is

• exothermic

• endothermic

• exogonic

• hydrophobic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

A reaction that releases heat to the surroundings is

• exothermic

• endothermic

• exogonic

• hydrophobic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

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

• Endothermic rxn

• Exothermic rxn

Tags

NGSS.HS-PS1-4

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

Tags

NGSS.HS-PS3-4

If object A molecules are moving faster than molecule B, but they have the same amount of total heat

• Object A have higher temperature than B

• Object A have lower temperature than B

• Objects A & B have the same temperature

Tags

NGSS.HS-PS3-4

A reaction happening in an uncovered beaker is a(n)...

• open system

• closed system

• isolated system

• individual system

There are four cups of hot cocoa. The cup sizes are shown. The temperature of the cocoa in each cup is 25 degrees celsius. Which cup has the MOST thermal energy?

• Large cup (Trenta)

• Small cup (Tall)

• Medium cup (Venti)

• All three are the same temperature so they have the same thermal energy

Tags

NGSS.HS-PS3-4

What unit do you use to measure Thermal Energy?

• J/Kg ºC

• Kg

• ºC

• J

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

In a closed system...

• only matter can transfer

• only energy can transfer

• both energy and matter can transfer

• nothing can transfer

Tags

NGSS.MS-PS1-5

NGSS.MS-PS3-5