Q: Copper has a specific heat of $$0.385\ \mathrm{J/g\cdot ^\circ C}. $$How much heat would be required to raise the temperature of $$7.50\ \mathrm{g} of $$copper from $$35.0\ ^\circ\mathrm{C} to$$ $$90.0\ ^\circ\mathrm{C}$$?

$$1.59 \times 10^2$\ \mathrm{J}$$

Question 1

Which of the following measurements has the correct number of significant digits for a value reported as $$0.015 mL$$?

Accepted Answer

$$0.015 mL $$has three significant digits.

Question 2

Which element is found in the fourth period and is an Alkaline Earth metal?

Accepted Answer

Calcium

Question 3

What is the value of the metric prefix 'centi-'?

Accepted Answer

$$10^{-2}$$

Question 4

A student measures the length of a rectangle using a ruler marked in centimeters and estimates to the nearest millimeter. Which of the following is the best way to report a length measured as 2.32 cm?

Accepted Answer

2.32 cm

Question 5

Which is the correct chemical symbol for the element Copper?

Accepted Answer

Cu

Question 6

At night, the surface of the moon can plummet to $$-208\ ^\circ\mathrm{F}. $$What is this temperature in Kelvin?

Accepted Answer

$$140\ \mathrm{K}$$

Question 7

A sodium-23 isotope, $$^{23}_{11}\mathrm{Na}$$, has how many protons and how many neutrons?

Accepted Answer

11 protons and 12 neutrons

Question 8

Acetone is used as a fingernail polish remover. The density of acetone is $$0.791\ \mathrm{g/mL}. $$What volume of acetone would have a mass of $$125\ \mathrm{g}$$?

Accepted Answer

$$158\ \mathrm{mL}$$

Question 9

Which of the following is a heterogeneous mixture?

Accepted Answer

A three-bean chicken soup with visible ingredients

Question 10

Which isotope decays the slowest and is the most stable?

Accepted Answer

Carbon-14

Question 11

Copper has a specific heat of $$0.385\ \mathrm{J/g\cdot ^\circ C}. $$How much heat would be required to raise the temperature of $$7.50\ \mathrm{g} of $$copper from $$35.0\ ^\circ\mathrm{C} to$$ $$90.0\ ^\circ\mathrm{C}$$?

Accepted Answer

$$1.59 	imes 10^2$\ \mathrm{J}$$

Question 12

What type of nuclear reaction is illustrated by $$^{196}_{80}\mathrm{Hg} + e^- \$$rightarrow ^{196}$$_{79}\mathrm{Au}$$?

Accepted Answer

Electron capture

Question 13

Which element from the list below is considered a metal?

Accepted Answer

Barium

Question 14

Which element below has seven valence electrons?

Accepted Answer

Bromine

Question 15

Which of the following is a physical property of ammonia, NH$$_3$$?

Accepted Answer

It boils at $$-33\ ^\circ\mathrm{C}$$ under atmospheric pressure.

Question 16

The dimensions of a cube were measured as $$9.876\ \mathrm{cm}$$, $$3.21\ \mathrm{cm}$$, and $$1.2\ \mathrm{cm}. $$What is the volume of the cube expressed to the proper number of significant digits?

Accepted Answer

$$38\ \mathrm{cm}^3$$

Question 17

Which subatomic particle has a positive charge associated with it?

Accepted Answer

Proton only

Question 18

Which electron dot symbol shown below for aluminum is the best representation for the number of valence electrons?

Accepted Answer

Al with three dots

Question 19

Which of the following would be considered a chemical change?

Accepted Answer

Meat spoils after it is removed from the refrigerator.

Question 20

Potassium-40 is a radioactive positron emitter. What daughter nuclide is formed after Potassium-40 undergoes positron emission?

Accepted Answer

$$^{40}_{18}\mathrm{Ar}$$

GOB Chemistry: Fundamental Concepts and Problem-Solving Study Guide

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