Q: Which equation is used to calculate the heat required to change the temperature of a substance?

$$\text{Heat} = \text{mass} \times \Delta T \times \text{specific heat}$$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout, such as sugar water.

Question 2

A sample of air is classified as which of the following?

Accepted Answer

A homogeneous mixture

Question 3

Which physical property is most useful for distinguishing copper from other metals in cookware?

Accepted Answer

Its excellent conductivity of heat and electricity

Question 4

Which of the following changes is a chemical change?

Accepted Answer

Iron rusting in the presence of water

Question 5

A patient’s body temperature is measured at $$39.5\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$312.5\ \mathrm{K}$$

Question 6

Which equation correctly converts Celsius temperature to Fahrenheit?

Accepted Answer

$$T_F = 1.8(T_C) + 32$$

Question 7

A calorimeter is used in nutrition science to measure:

Accepted Answer

The energy released from burning food

Question 8

How many calories are equivalent to $$150\ \mathrm{J} of $$energy? (Use $$1\ \mathrm{cal} = 4.184\ \mathrm{J})$$

Accepted Answer

$$35.9\ \mathrm{cal}$$

Question 9

Which of the following is an example of kinetic energy?

Accepted Answer

Rollerblading down a street

Question 10

A metal sample with mass $$24.8\ \mathrm{g}$$ absorbs $$275\ \mathrm{J} of $$energy, raising its temperature from $$20.2\ ^\circ\mathrm{C} to$$ $$24.5\ ^\circ\mathrm{C}. $$What is its specific heat?

Accepted Answer

$$0.32\ \mathrm{J/g}^\circ\mathrm{C}$$

Question 11

Which process describes the direct change from solid to gas without passing through the liquid state?

Accepted Answer

Sublimation

Question 12

How much energy (in kJ) is required to melt $$32.0\ \mathrm{g} of $$ice at $$0^\circ\mathrm{C}$$? (Heat of fusion for water = $$334\ \mathrm{J/g})$$

Accepted Answer

$$10.7\ \mathrm{kJ}$$

Question 13

Which of the following statements about gases is correct?

Accepted Answer

Gases have an indefinite shape and volume, and particles move rapidly.

Question 14

A patient with hypothermia has a body temperature of $$34.8\ ^\circ\mathrm{C}. $$What is this temperature in Fahrenheit?

Accepted Answer

$$94.6\ ^\circ\mathrm{F}$$

Question 15

Which of the following is a physical property?

Accepted Answer

Copper is shiny

Question 16

Which of the following is true about the Kelvin temperature scale?

Accepted Answer

It starts at absolute zero and has no negative values.

Question 17

Which equation is used to calculate the heat required to change the temperature of a substance?

Accepted Answer

$$	ext{Heat} = 	ext{mass} 	imes \Delta T 	imes 	ext{specific heat}$$

Question 18

Which of the following is NOT a requirement for correct dimensional analysis in healthcare calculations?

Accepted Answer

Memorizing all conversion factors

Question 19

Which of the following is a reversible process?

Accepted Answer

Melting and freezing of water

Chapter 3: Matter and Energy – Structured Study Notes for GOB Chemistry

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