Q: Convert $$0.00056$$ meters to scientific notation.

$$5.6 \times 10$$^{-4}$$\ \mathrm{m}$$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

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

Question 2

Which subatomic particle has a relative mass of approximately 1 amu and is found in the nucleus of an atom?

Accepted Answer

Proton

Question 3

Which of the following changes is a chemical change?

Accepted Answer

Burning a piece of paper

Question 4

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 8A

Question 5

A sample of gold has a mass of $$19.3\ \mathrm{g}$$ and a volume of $$1.00\ \mathrm{cm}^3. $$What is the density of gold in $$\mathrm{g/cm}^3$$?

Accepted Answer

$$19.3\ \mathrm{g/cm}^3$$

Question 6

Convert $$0.00056$$ meters to scientific notation.

Accepted Answer

$$5.6 	imes 10$$^{-4}$$\ \mathrm{m}$$

Question 7

How many significant figures are in the measurement $$0.02030$$?

Accepted Answer

4

Question 8

A patient receives a radioactive dose of $$2.5\ \mathrm{mCi}. $$How many microcuries ($$\mu\mathrm{Ci}) is $$this? ($$1\ \mathrm{mCi} = 1000\ \mu\mathrm{Ci})$$

Accepted Answer

$$2500\ \mu\mathrm{Ci}$$

Question 9

Which of the following is the correct electron configuration for a neutral atom of magnesium ($$Z=12$$)?

Accepted Answer

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

Question 10

Which of the following pairs are isotopes of each other?

Accepted Answer

$$^{14}_{6}\mathrm{C}$$\ and\ ^{12}_{6}\mathrm{C}$

Question 11

Which type of radioactive decay results in the emission of a particle with a $$+1$$ charge and a mass number of $$0$$?

Accepted Answer

Positron emission

Question 12

A radioactive isotope has a half-life of $$4$$ hours. If you start with $$80\ \mathrm{mg}$$, how much remains after $$12$$ hours?

Accepted Answer

$$10\ \mathrm{mg}$$

Question 13

Which of the following best describes nuclear fission?

Accepted Answer

A large nucleus splits into smaller nuclei, releasing energy.

Question 14

Which element is most commonly used in PET scans?

Accepted Answer

$$^{18}\mathrm{F}$$

Question 15

What is the charge of the copper ion in $$\mathrm{CuCl}_2$$?

Accepted Answer

$$+2$$

Question 16

Which of the following statements about ionic compounds is correct?

Accepted Answer

They are composed of metals and nonmetals and have an overall charge of zero.

Question 17

Which of the following elements is a metal?

Accepted Answer

Iron (Fe)

Question 18

How many valence electrons does a phosphorus atom ($$Z=15) $$have?

Accepted Answer

5

Question 19

Which of the following best explains why atoms form chemical bonds?

Accepted Answer

To achieve a stable octet of electrons in their outermost shell.

Question 20

A neutral atom of chlorine has 17 protons. How many electrons does the chloride ion ($$\mathrm{Cl}^-) $$have?

Accepted Answer

18

Question 21

Which of the following is the correct formula for an ionic compound formed between magnesium and nitrogen?

Accepted Answer

$$\mathrm{Mg}_3\mathrm{N}_2$$

Chem 101 Exam 1 Study Guide: Chapters 1–5 (GOB Chemistry)

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