IB Chemistry Energetics

Which of the letters (A-D) represents the potential energy of the reactants?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-4

What kind of reaction is this?

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

A sample of iron receives 50J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?

• 25g
• 30g
• 20g
• 50g

Tags

NGSS.HS-PS3-1

žDetermine the energy (in J) required to raise the temperature of 100.0 g of water from 20.0 C to 85.0 C? The specific heat of water is 4.184 J/g°C

• 500 J
• 4,182 J
• 27,196 J
• 27200 J

Tags

NGSS.HS-PS3-1

The Law of Conservation of Energy states energy cannot be gained or lost but only transformed.

• True
• False

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

NGSS.HS-PS3-2

Calculate ∆T if a system's water temperature decreases from 50 °C to 18 °C.

• 50
• 68
• -32
• 32

Consider the reaction: 2 H₂O + energy --> 2H₂ + O₂

• exothermic, releasing energy
• exothermic, absorbing energy
• endothermic, absorbing energy
• endothermic, releasing energy

Tags

NGSS.HS-PS1-4

If the temperature of copper starts at 15°C and increases to 100°C, what is the change in temperature?

• 115
• 100
• 85
• 15

When you rub your hands together on a cold day, you use friction to convert

• electrical into electromagnetic

• nuclear into electrical

• thermal into nuclear

• kinetic into thermal

Tags

NGSS.HS-PS3-3

What are the two units for Heat?

• cal and joules
• cal and grams
• joules and celcius
• there is only one