Q: Which of the following operations contains the correct answer with the correct number of significant figures?

$46.7 \times \dfrac{23.22}{90.10} = 12.0$

Question 1

A student measures the mass of a solid object as 8.24 g. The object is placed in a graduated cylinder containing 18.5 mL of water, causing the water level to rise to 23.1 mL. What is the density of the object in g/mL?

Accepted Answer

$0.558\ \mathrm{g/mL}$

Question 2

A thermometer shows a temperature of $45.8^\circ\mathrm{C}$. What is this temperature in degrees Fahrenheit?

Accepted Answer

$114^\circ\mathrm{F}$

Question 3

A student buys four Venti	extsuperscript{	extregistered} Cold cappuccinos, each containing 24 ounces. If $1\ \mathrm{oz} = 29.6\ \mathrm{mL}$, what is the total volume in liters?

Accepted Answer

$2.84\ \mathrm{L}$

Question 4

Which of the following is an example of a physical change?

Accepted Answer

Water freezing

Question 5

Which of the following is an example of potential energy?

Accepted Answer

Water stored in a reservoir

Question 6

The specific heat of a substance is the amount of heat needed to:

Accepted Answer

Raise the temperature of $1\ \mathrm{g}$ of the substance by $1^\circ\mathrm{C}$

Question 7

How many kilojoules are required to raise the temperature of a $150\ \mathrm{g}$ sample of silver from $25^\circ\mathrm{C}$ to $135^\circ\mathrm{C}$? (Specific heat of silver $= 0.235\ \mathrm{J/g}^\circ\mathrm{C}$)

Accepted Answer

$3.88\ \mathrm{kJ}$

Question 8

A $1.3\ \mathrm{g}$ sample of rice is burned in a calorimeter, releasing $22\ \mathrm{kJ}$ of energy. What is the energy value of the rice in kilocalories per gram? ($1\ \mathrm{cal} = 4.184\ \mathrm{J}$)

Accepted Answer

$4.0\ \mathrm{kcal/g}$

Question 9

If the heat of fusion for water is $334\ \mathrm{J/g}$, how many kilojoules are needed to melt $45.0\ \mathrm{g}$ of ice at $0^\circ\mathrm{C}$?

Accepted Answer

$15.0\ \mathrm{kJ}$

Question 10

Which of the following correctly expresses $63,500$ in scientific notation?

Accepted Answer

$6.35 	imes 10^4$

Question 11

Which of the following operations contains the correct answer with the correct number of significant figures?

Accepted Answer

$46.7 	imes \dfrac{23.22}{90.10} = 12.0$

Question 12

Which element is located in Period 4 and Group 2A(2) of the periodic table?

Accepted Answer

Ca

Question 13

What is the maximum number of electrons that can be accommodated in energy level $n = 4$?

Accepted Answer

$32$

Question 14

Which of the following statements regarding ionization energy trends is correct?

Accepted Answer

Magnesium has a lower ionization energy than strontium (Sr)

Question 15

Alpha particles are composed of:

Accepted Answer

Protons and neutrons

Question 16

A cooling curve is shown with regions labeled A, B, C, D, and E. Which region represents the phase change from liquid to solid?

Accepted Answer

D

Question 17

Which of the following diagrams best represents a pure compound?

Accepted Answer

A diagram showing only one type of molecule, each made of two or more different atoms bonded together

Question 18

What is the atomic mass of chlorine on a planet where $^{35}\mathrm{Cl}$ (amu = 34.9700, abundance = 13.85%) and $^{37}\mathrm{Cl}$ (amu = 36.9700, abundance = 86.15%) are found?

Accepted Answer

$36.69\ \mathrm{amu}$

Question 19

Which element has the fewest valence electrons?

Accepted Answer

Potassium

Introductory Chemistry Exam 1 – Step-by-Step Study Guidance

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