Q: A sample of titanium weighs $$3.48 \times 10$$^{-2}$$ g. Approximately how many atoms are in this sample? (Atomic mass of Ti = 47.9 g/mol, Avogadro's number = 6.022$$ \times $$10^{23}$$ atoms/mol)

$$4.38 \times 10$$^{20}$$ atoms

Q: Which of the following conversion factors or equalities is NOT correct?

$$1 \text{ gram} = 100 \text{ decagrams}$$

Question 1

Which of the following is an example of a homogeneous mixture?

Accepted Answer

A solution of rubidium bromide in water

Question 2

Which process below is a chemical change?

Accepted Answer

Baking a cake

Question 3

Which of the following elements is incorrectly matched with its symbol?

Accepted Answer

Rubidium, Tc

Question 4

Which would be classified as a heterogeneous mixture?

Accepted Answer

A boulder

Question 5

Which element has chemical properties most similar to radium?

Accepted Answer

Calcium

Question 6

A sample of titanium weighs $$3.48 	imes 10$$^{-2}$$ g. Approximately how many atoms are in this sample? (Atomic mass of Ti = 47.9 g/mol, Avogadro's number = 6.022$$ 	imes $$10^{23}$$ atoms/mol)

Accepted Answer

$$4.38 	imes 10$$^{20}$$ atoms

Question 7

Convert 1266 grams to kilograms.

Accepted Answer

$$1.266 kg$$

Question 8

A 1000.0 g sample of tin required 394 calories to raise its temperature from 24.5$$^\circC to 100.0$^\circC. $$What is the specific heat of this metal?

Accepted Answer

$$0.0524$$ cal/g$$^\circC$$

Question 9

Which of the following conversion factors or equalities is NOT correct?

Accepted Answer

$$1 	ext{ gram} = 100 	ext{ decagrams}$$

Question 10

How many significant figures are in the result of the following computation: $$14.023$$ liters $$+ 1.5$$ liters?

Accepted Answer

2

Question 11

Which of the following represents a valid, properly written, ground state electron configuration?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$

Question 12

Which type of electromagnetic radiation has the highest energy (shortest wavelength)?

Accepted Answer

Ultraviolet (UV)

Question 13

A neutral atom with a valence shell configuration of $$ns^2np^1$ will form a _____ ion.

Accepted Answer

1+

Question 14

Which element will combine with either lithium or sodium to form a 1:1 compound?

Accepted Answer

Iodine

Question 15

Which of the following metals is isoelectronic with $$S^{2-}$$?

Accepted Answer

Ne

Question 16

A bottle contains 6.0 fluid ounces of alcohol. What is the mass of alcohol in the bottle? (Note: 1 fluid ounce = 29.56 mL; density of alcohol = 0.87 g/mL)

Accepted Answer

154.5 g

Question 17

A solid melts at $$-111^\circC $$and it becomes a gas when its temperature is above $$-32^\circC. At $$which temperature would it exist as a liquid?

Accepted Answer

150 K

Question 18

Which of the following best describes the electron configuration for an excited state sodium ion, Na$$^+$$?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3p^1$$

Question 19

How many nonmetal atoms are there in the formula of Al$$_2(SO$_4$$)$$_3$$?

Accepted Answer

15

Question 20

Which of the following elements is a metalloid with 2 valence electrons?

Accepted Answer

Germanium

General Chemistry and Atomic Structure: Study Guide for Biology Students

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