Q: Convert $$0.0035 \ \text{kg} to $$micrograms ($$\mu\text{g}).$$

$$3.5 \times 10$$^{6}$$ \ \mu\text{g}$$

Q: Which of the following correctly balances the nuclear equation for the beta decay of $$^{14}_{6}\text{C}$$?

$$^{14}_{7}\text{N} + \$$beta^{-}$$

Question 1

A patient receives a dose of 2.5 mCi of a radioactive isotope for a diagnostic scan. If the isotope has an activity of $$1 \ 	ext{mCi} = 3.7 	imes 10$$^{7}$$ \ 	ext{disintegrations/s}$$, how many disintegrations occur per second in the patient?

Accepted Answer

$$9.25 	imes 10$$^{7}$$

Question 2

Which of the following statements best describes the result of the Rutherford Gold Foil Experiment?

Accepted Answer

Most alpha particles passed through the foil, but some were deflected at large angles, indicating a small, dense, positively charged nucleus.

Question 3

A sample of radiation delivers a dose of $$50 \ 	ext{rad} of $$alpha particles. Given that $$1 \ 	ext{rad} of $$alpha radiation equals $$20 \ 	ext{rem}$$, what is the biological damage in rem?

Accepted Answer

$$1000 \ 	ext{rem}$$

Question 4

Which of the following is a chemical change?

Accepted Answer

Burning wood

Question 5

Convert $$0.0035 \ 	ext{kg} to $$micrograms ($$\mu	ext{g}).$$

Accepted Answer

$$3.5 	imes 10$$^{6}$$ \ \mu	ext{g}$$

Question 6

A neutral atom of chlorine has an atomic number of 17 and a mass number of 35. How many protons, neutrons, and electrons does it have?

Accepted Answer

17 protons, 18 neutrons, 17 electrons

Question 7

Which of the following correctly balances the nuclear equation for the beta decay of $$^{14}_{6}	ext{C}$$?

Accepted Answer

$$^{14}_{7}	ext{N} + \$$beta^{-}$$

Question 8

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

Accepted Answer

nano-

Question 9

A compound is named magnesium chloride. What is its chemical formula?

Accepted Answer

$$	ext{MgCl}_2$$

Question 10

Which of the following molecules has a bent geometry?

Accepted Answer

$$	ext{H}_2	ext{O}$$

Question 11

If a sodium atom loses one electron, what is the resulting charge?

Accepted Answer

$$+1$$

Question 12

Which of the following best describes the direction of the dipole in a bond between hydrogen and fluorine?

Accepted Answer

Toward fluorine, because it is more electronegative

Question 13

A solution contains $$5.0 \ 	ext{mg} of a $$drug in $$250 \ 	ext{mL} of $$solution. What is the concentration in $$\mu	ext{g}/	ext{mL}$$?

Accepted Answer

$$20 \ \mu	ext{g}/	ext{mL}$$

Question 14

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 15

What is the correct name for $$	ext{K}_2	ext{O}$$?

Accepted Answer

Potassium oxide

Question 16

A patient receives $$0.75 \ 	ext{rad} of $$gamma radiation. If $$1 \ 	ext{rad} of $$gamma radiation equals $$1 \ 	ext{rem}$$, what is the total biological damage in rem?

Accepted Answer

$$0.75 \ 	ext{rem}$$

Question 17

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 18

A cation has a $$+2$$ charge and is paired with an anion with a $$-1$$ charge. What is the formula of the resulting ionic compound?

Accepted Answer

$$	ext{M} 	ext{A}_2$$

Question 19

Which of the following is the correct scientific notation for 0.0000456?

Accepted Answer

$$4.56 	imes 10$$^{-5}$$

Question 20

How many significant figures are in the measurement 0.02030?

Accepted Answer

4

Chem 102 Midterm 1 Study Guide: GOB Chemistry Core Concepts

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