HC Unit 6 Ions Test

Front

What is the definition of enthalpy (ΔH)?

Back

Enthalpy (ΔH) is a measure of the total heat content of a system, used to quantify the energy changes during a chemical reaction or phase change.

Front

What is the formula to calculate heat transfer (q) in a substance?

Back

q = m × c × ΔT, where m is mass, c is specific heat capacity, and ΔT is the change in temperature.

Front

What is specific heat capacity?

Back

Specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1 °C.

Front

How do you calculate the final temperature of a mixture of two substances?

Back

Use the principle of conservation of energy: m1 × c1 × (T_final - T_initial1) + m2 × c2 × (T_final - T_initial2) = 0.

Front

What is the specific heat capacity of water?

Back

The specific heat capacity of water is approximately 4.18 J/g°C.

Front

What is the significance of a positive ΔH value?

Back

A positive ΔH value indicates that a reaction is endothermic, meaning it absorbs heat from the surroundings.

Front

What is the significance of a negative ΔH value?

Back

A negative ΔH value indicates that a reaction is exothermic, meaning it releases heat to the surroundings.

Front

How many joules are required to raise the temperature of 1 g of water by 1 °C?

Back

It requires 4.18 joules to raise the temperature of 1 g of water by 1 °C.

Front

What is the formula for calculating the heat required to change the temperature of a substance?

Back

q = m × c × ΔT, where q is heat, m is mass, c is specific heat, and ΔT is the change in temperature.

Front

What is the relationship between mass, specific heat, and temperature change in calorimetry?

Back

In calorimetry, the heat absorbed or released by a substance is directly proportional to its mass, specific heat, and the temperature change.