Thermochemistry!

An endothermic reaction has a ΔH value that is greater than zero.

• True

• False

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Heat always flows from cold objects to hot objects.

• True

• False

Reactions where the energy of the reactants is greater than the energy of the products are called _____________.

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

In an exothermic reaction, energy is being ________________.

• absorbed

• released

Tags

NGSS.HS-PS1-4

Which metal below would be the best conductor of energy? The Specific Heat values are in the table.

• Iron

• Copper

• Titanium

• Silver

How much energy will be released when 2.65 g of CH₃OH is combusted?

2 CH₃OH (L) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O (g) + 5432 J

• 448 J

• 898 J

• 28800 J

• 225 J

How many grams of water will be formed when 2564 J of energy is released?

2 CH₃OH (L) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O (g) + 5432 J

• 8.51 g H₂O

• 76.4 g H₂O

• 121 g H₂O

• 34.0 g H₂O

Which of the following energy diagrams describes the reaction of silver and sodium chloride?

1250 J + Ag(s) + NaCl(aq) → Na(s) + AgCl(s)

• 
• 
• 
• 

Tags

NGSS.HS-PS1-4

Iron has a specific heat of 0.450 J/g°C. What is the mass of a piece of iron that absorbs 123.1 J of energy and has a temperature increase of 12.1 °C?

• 4.58 g

• 22.6 g

• 3310 g

• 0.0442 g

What tool can you use to measure the average kinetic energy of a sample?

• A Balance

• A Bunsen Burner

• A Thermometer

• A Graduated Cylinder