Q: A laboratory sample has a mass of 2.50 kg. What is this mass in grams?

$$2.50 \times 10$$^{3}$$\ \text{g}$$

Question 1

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that retain their individual properties and can be separated by physical means.

Question 2

Which region of the periodic table contains the noble gases?

Accepted Answer

Group 18 (far right column)

Question 3

Express the number 0.0004560 in scientific notation with the correct number of significant figures.

Accepted Answer

$$4.560 	imes 10$$^{-4}$$

Question 4

How many significant figures are in the measurement 0.02030 g?

Accepted Answer

4

Question 5

A patient’s temperature is measured as 102.2 $$^\circF. $$What is this temperature in Kelvin? (Use $$K = ^\circ C + 273.15$$ and $$^\circ C = \frac{5}{9}(^\circ F - 32))$$

Accepted Answer

$$311.2\ K$$

Question 6

Which metric prefix corresponds to $$10^{-6}$$?

Accepted Answer

micro

Question 7

A laboratory sample has a mass of 2.50 kg. What is this mass in grams?

Accepted Answer

$$2.50 	imes 10$$^{3}$$\ 	ext{g}$$

Question 8

Which of the following statements about subatomic particles is correct?

Accepted Answer

Electrons are found outside the nucleus and have a negative charge.

Question 9

An atom of $$^{35}_{17}Cl$$ has how many protons, neutrons, and electrons?

Accepted Answer

17 protons, 18 neutrons, 17 electrons

Question 10

Which of the following is the correct representation of an isotope with 6 protons, 8 neutrons, and 6 electrons?

Accepted Answer

$$^{14}_{6}C$$

Question 11

How many valence electrons does a phosphorus atom have?

Accepted Answer

5

Question 12

Which of the following best defines a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 13

What is the correct name for the compound $$N_2O_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 14

Which of the following is the correct formula for carbon tetrachloride?

Accepted Answer

$$CCl_4$$

Question 15

Which Lewis dot symbol correctly represents a chlorine atom?

Accepted Answer

Cl with 7 dots around it

Question 16

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 17

A sample contains 0.250 L of a solution. How many milliliters is this?

Accepted Answer

$$250\ 	ext{mL}$$

Question 18

Which of the following is a binary covalent compound?

Accepted Answer

CO$$_2$$

Question 19

A student needs to convert 5.00 cm to meters. What is the correct value?

Accepted Answer

$$0.00500\ 	ext{m}$$

Question 20

Which of the following best describes the difference between atomic number and mass number?

Accepted Answer

Atomic number is the number of protons; mass number is the sum of protons and neutrons.

Study Guide: Matter, Measurement, Atoms, and Covalent Bonding

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