Question 1

Which of the following is the correct scientific notation for the number 0.000020, using the proper number of significant figures?

Accepted Answer

$$2.0 	imes 10$$^{-5}$$

Question 2

Calculate $$2.50/3.44 + 539.1$$ and express your answer with the correct number of significant figures.

Accepted Answer

$$539.7$$

Question 3

Which metric prefix corresponds to $$10^{-9}$$?

Accepted Answer

nano

Question 4

Convert $$69440$$ inches to meters using the appropriate conversion factors.

Accepted Answer

$$176.4$$ meters

Question 5

A vehicle has a fuel efficiency of $$25$$ miles/gallon. How many kilometers can it travel on $$2$$ gallons? (1 mile = 1.609 km)

Accepted Answer

$$80.45 km$$

Question 6

What is the definition of density, and what is the volume in mL of $$3.40 kg of $$water? (Density of water = $$1.00 g/mL)$$

Accepted Answer

Density is mass per unit volume; $$3400 mL$$

Question 7

A $$100 g $$food sample is burned in a calorimeter with $$1000 g $$water. The temperature rises from $$25.0\, ^\circ\mathrm{C} to$$ $$60.0\, ^\circ\mathrm{C}. $$Calculate the energy released in joules. ($$SH_{water} = 4.184 J/g$\cdot$$°C)

Accepted Answer

$$146,440 J$$

Question 8

Which of the following statements best describes Rutherford’s atomic model?

Accepted Answer

Atoms have a small, dense, positively charged nucleus with electrons orbiting around it.

Question 9

How many protons, neutrons, and electrons are in an oxygen atom with mass number $$18$$?

Accepted Answer

8 protons, 10 neutrons, 8 electrons

Question 10

What is the correct Lewis structure for ammonia ($$NH_3$$)?

Accepted Answer

A nitrogen atom with three single bonds to hydrogen atoms and one lone pair on nitrogen.

Question 11

What is the molecular shape of carbon dioxide ($$CO_2$$)?

Accepted Answer

Linear

Question 12

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are shared unequally between two atoms.

Question 13

What is the formula for nitrogen dioxide?

Accepted Answer

$$NO_2$$

Question 14

Which of the following is the correct name for $$MgCl_2$$?

Accepted Answer

Magnesium chloride

Question 15

How many valence electrons are present in an $$O_2$$ molecule?

Accepted Answer

12

Question 16

Which of the following is the correct symbol for the magnesium cation?

Accepted Answer

$$Mg^{2+}$$

Question 17

Which of the following is a common polyatomic ion?

Accepted Answer

Sulfate, $$SO_4$$^{2-}$$

Question 18

A patient is prescribed a medicine at a dosage of $$0.10 mg/lb. $$How many mg should be given to a $$150 lb $$patient?

Accepted Answer

$$15 mg$$

Question 19

Which of the following best describes the trend in electronegativity across a period in the periodic table?

Accepted Answer

Electronegativity increases from left to right.

Question 20

Convert $$25.0$$ °C to Kelvin using the appropriate formula.

Accepted Answer

$$298 K$

Exam 1 Review Guidance: Chapters 1, 2, 3, 4, 6 (GOB Chemistry)

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