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 is known as 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?

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 $$0.02030 g$$?

Accepted Answer

4

Question 8

A patient receives a radioactive dose of $$2.5\ \mathrm{mCi} ($$millicuries). What does the Curie (Ci) measure?

Accepted Answer

Radioactivity (number of disintegrations per second)

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 of the following statements about alpha decay is correct?

Accepted Answer

Alpha decay emits a particle with 2 protons and 2 neutrons, decreasing the atomic number by 2 and mass number by 4.

Question 12

A radioactive isotope has a half-life of 3 days. If you start with $$80\ \mathrm{mg}$$, how much remains after 9 days?

Accepted Answer

$$10\ \mathrm{mg}$$

Question 13

Which element is most commonly used in PET scans?

Accepted Answer

$$^{18}\mathrm{F} ($$Fluorine-18)

Question 14

Which of the following best describes nuclear fission?

Accepted Answer

A large nucleus splits into smaller nuclei, releasing energy and neutrons.

Question 15

Which of the following ions has 10 electrons?

Accepted Answer

$$\mathrm{Na}^+$$

Question 16

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

Accepted Answer

$$+2$$

Question 17

Which of the following best explains why metals tend to form cations?

Accepted Answer

Metals have few valence electrons and lose them to achieve a stable octet.

Question 18

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

Accepted Answer

$$\mathrm{MgCl}_2$$

Question 19

A solution is prepared by dissolving $$5.00\ \mathrm{g} of $$NaCl in enough water to make $$250.0\ \mathrm{mL} of $$solution. What is the density of the solution if its total mass is $$255.0\ \mathrm{g}$$?

Accepted Answer

$$1.02\ \mathrm{g/mL}$$

Question 20

Which of the following statements about the periodic trends is correct?

Accepted Answer

Atomic size increases down a group and decreases across a period from left to right.

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

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