Question 1

Which of the following best describes the scientific method as used in chemistry?

Accepted Answer

A set of steps including observation, hypothesis, experiment, and conclusion.

Question 2

Which of the following statements about matter is correct?

Accepted Answer

Matter is anything that has mass and occupies space.

Question 3

Which of the following combinations of element name and symbol is incorrect?

Accepted Answer

Iron I

Question 4

Which of the following elements is a metalloid (semiconductor)?

Accepted Answer

As

Question 5

Which of the following elements is a noble gas?

Accepted Answer

He

Question 6

Which of the following elements is located in group IIIA and period 4 of the periodic table?

Accepted Answer

Ga

Question 7

Which of the following is NOT a subatomic particle?

Accepted Answer

Photon

Question 8

A neutral atom of the isotope $$\mathrm{^{42}_{20}Ca}$$ contains how many protons, neutrons, and electrons?

Accepted Answer

20 protons, 22 neutrons, 20 electrons

Question 9

How many neutrons are present in an atom of manganese isotope with mass number 55 ($$\mathrm{^{55}Mn}$$)? (Atomic number of Mn = 25)

Accepted Answer

30

Question 10

Which of the following pairs of elements will form an ionic bond?

Accepted Answer

Potassium and chlorine

Question 11

What ion is formed when a calcium atom loses two electrons?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$}$$

Question 12

What is the formula for the compound formed from magnesium and oxygen?

Accepted Answer

$$\mathrm{MgO}$$

Question 13

What is the name of the compound with the formula $$\mathrm{Na_2S}$$?

Accepted Answer

Sodium sulfide

Question 14

What is the formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 15

Which of the following compounds is classified as covalent?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 16

What is the name of the compound with the formula $$\mathrm{Ca(NO_2$)_2}$$?

Accepted Answer

Calcium nitrite

Question 17

Which of the following statements about chemical bonding is FALSE?

Accepted Answer

When a metal loses electrons, a negative ion is formed.

Question 18

What is the formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N_2O_4}$$

Question 19

A patient is given a medication containing ammonium chloride. What is the formula for this compound?

Accepted Answer

$$\mathrm{NH_4Cl}$$

Question 20

Which of the following best describes a polyatomic ion?

Accepted Answer

A charged group of covalently bonded atoms.

GOB Chemistry Exam I Review: Step-by-Step Study Guidance

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