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Category CCategory A

Select the equipment that would be used to measure the mass of a sample of sodium chloride.

Balance beam

graduated cylinder

beaker

meter stick

Balance beam

Not close!

Sean was conducting a chemistry experiment that overheated and caught fire. Select the safety rule Sean

most likely failed to follow.

wear safety goggles

follow the teacher's instructions

use tongs to handle hot glassware

keep the work space clean and uncluttered

follow the teacher's instructions

If you thought that you were wrong,

you are right!

A skier traveling at 30.0 m/s falls and comes to rest 10.0 seconds later. What is her average acceleration?

300 m/s2

3.00 m/s2

-3.00 m/s2

-300 m/s2

-3.00 m/s2

STOP!

Select the situation that will result in the greatest gravitational force between two bodies.

large combined mass and small distance apart

large combined mass and great distance apart

small combined mass and great distance apart

small combined mass and small distance apart

large combined mass and small distance apart

60 g of KNO3 is added to a beaker of water at 40 degrees, the water is heated to 70 degrees, how much more KNO3

can be added to make a saturated solution?

Only 60 grams of KNO3 can be added until the solution is saturated .

Only 70 grams of KNO3 can be added until the solution is saturated .

Only 80 grams of KNO3 can be added until the solution is saturated .

No more grams of KNO3 can be added, solution is already saturated.

Only 70 grams of KNO3 can be added until the solution is

saturated .

A circuit has a resistance of 12 ohms. Select the applied voltage that will result in a current of 10 amps.

1.2 volts

2 volts

22 volts

120 volts

120 volts

Which of the following substances is the least chemically reactive?

H+

OH-

O2-

H2O

H2O

Rodney hammers a 3cm nail into a board, using a single blow that delivers 4 N of force. Which

statement correctly describes the amount of work done on the nail?

Rodney has performed 12 J of work on the nail.

Rodney has 0.12 J of work on the nail.

Rodney has performed more than 12 J of work on the nail, because of the friction between the nail and the board.

Rodney has performed more than 0.12 J of work on the nail, because of the friction between the nail and the board.

Rodney has performed more than 0.12 J of work on the nail, because of the friction between the nail and

the board.

Plants use sunlight to fuel photosynthesis. Which of the following is the best description of the energy

transformation involved in this process?

radiant light energy to thermal energy

radiant light energy to chemical energy

thermal energy to mechanical energy

thermal energy to chemical energy

radiant light energy to chemical energy

Which of the following is true of a molecule?

A molecule must consist of covalently bound atoms.

A molecule must consist of more than two atoms.

A molecule must contain atoms of more than one element that are covalently bonded.

A molecule cannot remain bound when dissolved in a solvent.

A molecule must contain atoms of more than

one element that are covalently bonded.

Which of the following substances is an element?

steel

brass

iron

pewter

iron

Too bad!

Nuclear medicine involves the use of radionuclides to diagnose and treat various medical conditions. Injection of gamma-emitting

radionuclides allows doctors to image internal organs and tissues, using an instrument called gamma camera. Implantation of beta-emitting

radionuclide at the site of some kinds of tumor will destroy the cancerous tissue without destroying much healthy tissue, if any. Both procedures are considered very safe by the medical community, but

there is a small risk associated with any procedure involving radionuclides. The risk is that the radionuclides

could cause a chain reaction in the body.

could become unstable and emit a large amount of radiation unexpectedly.

consistently emit small doses of radiation that could damage healthy tissue and/or cause cancer.

may become trapped in the body.

consistently emit small doses of radiation that could damage

healthy tissue and/or cause cancer.

A speed boat navigates a straight path across a 5 mile section of Thurmond Lake over a period of 25 minutes. On

the return trip, the boater was forced to use a zigzag pattern to avoid stationary fishing boats; the return trip

also takes 25 minutes. Which of the following statements is NOT true of the return trip?

The boater increased the displacement that he traveled on the return trip.

The boater increased his velocity on the return trip.

The boater increased his average speed on the return trip.

The boater increased his acceleration on the return trip.

The boater increased the displacement that he traveled

on the return trip.

The weight of an object is less on the moon because

objects on the moon experience a greater acceleration due to gravity.

objects on the moon experience a lesser acceleration due to gravity.

there are fewer frictional forces on the moon.

there are more frictional forces on the moon.

objects on the moon experience a lesser

acceleration due to gravity.

The chain reaction in a fission-powered nuclear reactor is mediated by control rods. The control rods prevent the chain

reaction from proceeding too quickly and producing too much heat. Which statement best describes how control rods mediate

the chain reaction?

The control rods absorb neutrons produced by the joining of small atoms.

The control rods absorb neutrons produced by the splitting of large atoms. The control rods absorb electrons produced by the joining of small atoms. The control rods absorb electrons produced by the splitting of large atoms.

The control rods absorb neutrons produced by the splitting of large atoms.

Emilio pours 10 grams of salt (NaCl) into a saturated NaCl solution.

A pile of solid material appears at the bottom of the beaker. What is this material?

a precipitate that indicates that a chemical reaction has occurred excess salt that cannot dissolve in the saturated solution

a cloud of gas that indicates that the solvent is changing phase solid Na2Cl2, a product of the fusion of two NaCl molecules

excess salt that cannot dissolve in the saturated solution

Earthquake produces seismic waves, which deform the ground surrounding the epicenter of the earthquake and radiate

outwards. These waves get weaker the farther they get from the epicenter. Why is this?

The energy of the wave gets dispersed through its interaction with matter. The energy of the wave disappears a certain distance from the epicenter. The wave can only travel as far as its frequency will allow it to. The wave only has a limited amount of time to exist, as defined by its period.

The energy of the wave gets dispersed through its interaction with matter.

Carbonated soda has carbon dioxide gas dissolved in the liquid to give it "fizz."

Which of the following would be the best method of removing the carbon dioxide from the soda?

filtering the soda through a sieve

increasing the pressure of the soda

raising the temperature of the soda

exposing the soda to an electromagnet

raising the temperature of the soda

Which laboratory item is designed to slow the transfer of heat from a reaction vessel to your hand?

rubber gloves

lab coat

tongs

goggles

tongs

In which state of matter are water molecules free to move the most?

ice

condensation

liquid water

steam

steam

How should you handle glassware if you are not sure of its temperature?

Run cold water over it to cool it down in case it is hot.

Look to see if it is glowing red. If not, assume it is safe to handle.

Quickly touch the glass to test the temperature.

Assume it is hot, and use tongs or heat resistant gloves.

Assume it is hot, and use tongs or heat resistant gloves.

NOT CLOSE!

Which group of atoms will have the most reactive valence electrons?

Group 15

Group 16

Group 17

Group 18

Group 17

You drop an object with a mass of 7.6 g and a volume of 7.0 cm3 in a container of gasoline. Gasoline

has a density of 0.7 g/m3. Which of the following statements describes what will happen to the object?

The object will float because it is less dense than the gasoline.

The object will float because it is more dense than the gasoline.

The object will sink because it is less dense than the gasoline.

The object will sink because it is more dense than the gasoline.

The object will sink because it is more dense than the gasoline.

A scientist is interested in investigating the possibility of certain microorganisms cleaning

up toxic wastes. Which of the following statements concerning her investigation is true?

She should begin by researching any experiments and findings that have been published concerning

the clean-up of toxic wastes by microorganisms.

She should report her findings to a scientific journal only if the results of her experiment support her hypothesis.

Since she is confident that the experimental microorganisms will be able to clean up toxic wastes, there is no need

for her to perform multiple trails.

If results of her experiment support her hypothesis, she can conclude that all microorganisms will somehow be

useful in eliminating toxic wastes.

She should begin by researching any experiments and findings that have been published

concerning the clean-up of toxic wastes

by microorganisms.

In 1990, the discovery of the buckyball was announced. A buckyball is a ball-shaped molecule consisting of 60 carbon atoms. Before the

buckyball, only two forms of carbon were known: soft, black graphite and hard, transparent diamond. Which of the following hypotheses concerning

the buckyball cannot be tested using scientific experimentation?

The buckyball is the most useful form of carbon.

The melting point of buckyballs is higher than the melting point of diamond.

The buckyball is harder than diamond.

The buckyball can be produced in the laboratory and can be found in nature.

The buckyball is the most useful form of carbon.

Make your wager

Which of the following is a quantitative data set?

the number of every player on the football team

the color of the jerseys for every team in the league

the number of rushing yards gained by each player

the weather conditions for every game of the season

the number of rushing yards gained by each player