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

Guida di studio - Domande di pratica

Study guide - Flashcard