Q: Calculate the specific heat ($$c) of a $$metal if 250 J of energy raises the temperature of a 50 g sample by 10 $$^\\circC. $$Use the formula $$q = mc\\Delta T.$$

$$c = 0.5 \\ \mathrm{J/g}^\\circ\mathrm{C}$$

Question 1

Which of the following is an example of a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A sample contains two substances that can be separated by filtration. This sample is best classified as:

Accepted Answer

A heterogeneous mixture

Question 3

Which of the following statements about metals is TRUE?

Accepted Answer

Metals are malleable and good conductors of heat.

Question 4

Which element has the chemical symbol 'K'?

Accepted Answer

Potassium

Question 5

Which of the following best describes the process of condensation?

Accepted Answer

A gas changing into a liquid

Question 6

Calculate the specific heat ($$c) of a $$metal if 250 J of energy raises the temperature of a 50 g sample by 10 $$^\circC. $$Use the formula $$q = mc\Delta T.$$

Accepted Answer

$$c = 0.5 \ \mathrm{J/g}^\circ\mathrm{C}$$

Question 7

Which of the following is NOT a physical property?

Accepted Answer

Ability to react with acid

Question 8

An atom of magnesium ($$\mathrm{Mg}) $$has 12 protons, 12 neutrons, and 12 electrons. What is its atomic mass?

Accepted Answer

$$24 \ \mathrm{amu}$$

Question 9

Which statement about isotopes is correct?

Accepted Answer

Isotopes have different numbers of neutrons.

Question 10

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 11

A student heats 100 g of water from 25 $$^\circC to 75$$ $$^\circC. If $$the specific heat of water is $$4.18 \ \mathrm{J/g}^\circ\mathrm{C}$$, how much energy is absorbed?

Accepted Answer

$$20,900 \ \mathrm{J}$$

Question 12

Which of the following best describes the electron configuration of a neutral oxygen atom?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 13

Which of the following changes is an example of sublimation?

Accepted Answer

Dry ice turning directly into carbon dioxide gas

Question 14

Which of the following elements is most likely to be found as a diatomic molecule in nature?

Accepted Answer

Oxygen

Question 15

Which of the following statements about atomic theory is FALSE?

Accepted Answer

Atoms are indivisible and cannot be broken down further.

Question 16

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 17

Which element is a nonmetal and is essential for respiration in humans?

Accepted Answer

Oxygen

Question 18

Which of the following best explains why metals have high electrical conductivity?

Accepted Answer

Metals have loosely held valence electrons that can move freely.

Question 19

A sample contains 80% isotope A (mass = 10 amu) and 20% isotope B (mass = 11 amu). What is the average atomic mass?

Accepted Answer

$$10.2 \ \mathrm{amu}$$

Question 20

Which of the following trends is observed as you move from left to right across a period in the periodic table?

Accepted Answer

Ionization energy increases

GOB Chemistry Study Guide: Matter, Energy, Elements, and Atomic Structure

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