Q: A pool is a cylinder with a diameter of 8.0 m and a depth of 1.5 m. What is the volume of the pool in $$ \mathrm{cm}^3 $$? (Use $$ V = h \times 3.14 \times r^2$ $$, $$ 1\ \mathrm{m} = 100\ \mathrm{cm} )$$

$$ 7.54 \times 10^7$\ \mathrm{cm}^3 $$

Question 1

Which of the following best describes why the mass of ashes after burning wood is less than the original mass of the wood?

Accepted Answer

The missing mass was converted into gaseous compounds and released into the air.

Question 2

A student measures the temperature outside as -40 $$^\circF. $$What is this temperature in Kelvin? Use the equations: $$ ^\circ\mathrm{F} = (1.8 	imes ^\circ\mathrm{C}) + 32 $$ and $$ K = ^\circ\mathrm{C} + 273 .$$

Accepted Answer

$$ 233\ \mathrm{K} $$

Question 3

Which of the following statements about the scientific method is most accurate?

Accepted Answer

It emphasizes observation and experimentation as the way to understand the world.

Question 4

A block of unknown material has a mass of 24.0 g and dimensions 2.0 cm × 2.0 cm × 3.0 cm. Will it float in water? (Density of water = 1.0 g/mL)

Accepted Answer

No, because its density is 2.0 g/mL, which is greater than water.

Question 5

Which of the following is NOT a characteristic of alkali metals (Group 1A)?

Accepted Answer

Most of them are liquids at room temperature.

Question 6

A sample of water is heated from 15.0 $$^\circC to 65.0$$ $$^\circC. If $$the mass of water is 50.0 g and the specific heat of water is $$ 4.184\ \mathrm{J/g\ ^\circ C} $$, how much heat (in kJ) is absorbed?

Accepted Answer

$$ 10.5\ \mathrm{kJ} $$

Question 7

Which of the following best explains why water requires more energy to heat than aluminum for the same mass and temperature change?

Accepted Answer

Water has a larger specific heat than aluminum.

Question 8

Which of the following is a chemical change?

Accepted Answer

Burning natural gas in a stove.

Question 9

A nugget of silver has a mass of 210 g and displaces water from 25.0 mL to 42.0 mL in a graduated cylinder. What is the density of silver?

Accepted Answer

$$ 12.4\ \mathrm{g/mL} $$

Question 10

Which of the following statements about isotopes is FALSE?

Accepted Answer

Isotopes have the same mass number.

Question 11

A compound can be separated into its elements by which of the following?

Accepted Answer

Chemical processes such as electrolysis.

Question 12

Which of the following best describes the atomic structure of a neutral atom of $$ ^{23}\mathrm{Na}  ($$sodium, atomic number 11)?

Accepted Answer

11 protons, 12 neutrons, 11 electrons

Question 13

Which of the following is the correct scientific notation for the number 0.0000702?

Accepted Answer

$$ 7.02 	imes 10$$^{-5}$$ $$

Question 14

A pool is a cylinder with a diameter of 8.0 m and a depth of 1.5 m. What is the volume of the pool in $$ \mathrm{cm}^3 $$? (Use $$ V = h 	imes 3.14 	imes r^2$ $$, $$ 1\ \mathrm{m} = 100\ \mathrm{cm} )$$

Accepted Answer

$$ 7.54 	imes 10^7$\ \mathrm{cm}^3 $$

Question 15

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 16

Which of the following best describes the energy transformation when natural gas is burned to heat water?

Accepted Answer

Chemical energy is converted to thermal energy.

Question 17

Which of the following is the best definition of energy?

Accepted Answer

The ability to do work.

Question 18

Which state of matter has particles that are close together and has a definite shape?

Accepted Answer

Solid

Question 19

A sample contains 2.0 mol of $$ \mathrm{CO}_2 . $$How many molecules are present? ($$ 1\ \mathrm{mol} = 6.022 	imes 10$$^{23}$$ $$ molecules)

Accepted Answer

$$ 1.20 	imes 10$$^{24}$$ $$ molecules

Question 20

Which of the following is NOT true according to Dalton's Atomic Theory?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Intro to Chemistry Exam 1: Step-by-Step Study Guidance (Chapters 1–4)

Guida di studio - Domande di pratica

Study guide - Flashcard