tron

Balance the following equation to demonstrate the conservation of atoms in a reaction. Choose the answer which provides the correct coefficients for each reactant and product ____ Fe + _____ O2_____ Fe2O3

(4, 3, 2)

What is the total of the oxidation numbers for all the atoms in lithium oxide

0

The temperature at which water molecules have the LEAST amount of thermal energy is

0 K

The percentage of Earth's atmosphere consisting of carbon dioxide is about:

0.04%

Which of the following is the largest unit of atmospheric pressure

1 pound per square inch

At which of the following temperatures would thermal energy be lowest

10 K

In a hydraulic lift, a small cylinder is connected to a large cylinder. A 250-newton force is applied to the 0.0025-square meter area of the small cylinder. Answer the following questions based on this information. The pressure exerted on the small cylinder is

100,000 Pa

The most common oxidation number for an element with 16 electrons is

2-

How many atoms of aluminum (Al), sulfur (S), and oxygen (O) are in each molecule of Al2(SO4)

2-aluminum, 3-sulfur, 12-oxygen

A change of 20º on the Celsius scale would represent a change on the Fahrenheit scale o

36

Which of the following devices draws the most current when operating on a 120-volt circuit?

50-watt fan

A 500-milliliter pot of water at 3° Celsius is mixed with a 500-milliliter pot of water at 5° Celsius. The amount of heat transferred in the mixing process is:

500 calories

1 atmosphere of pressure is equivalent to both 14.7 pounds per square inch (psi) and 1013.25 millibars (mb). How many millibars equals 1 psi?

68.9

A common isotope of Carbon has an atomic number of 6 and a mass number of 13. How many neutrons are in an atom of this isotope

7

Atoms of elements in period 2 and period 3 are similar because the largest number of valence electrons their atoms may contain in the outermost energy level is

8

At sea level, the weight of the atmosphere on a human body is about

9,800 N

Which of the following is generally the best conductor?

A solid whose electrons are loosely bound to their molecules

Which of the following is a TRUE statement about atoms?

All atoms of the same element have the same number of electrons and protons, but may have different numbers of neutron

Of the following, which most likely involves a chemical reaction

Boiling water turns a fresh egg into a hard boiled egg

The irregular, jerky motion of dust particles in water that may be observed under a microscope was named in honor of

Botanist Robert Brown

Identify the reactants in the combustion of methane

CH4 and O2

What are energy-rich compounds, such as starch, glucose, and sucrose

Carbohydrates

What substance in our atmosphere has been significantly reduced by the process of photosynthesis?

Carbon dioxide

Which is the most abundant gas found in the atmospheres of both Venus and Mars?

Carbon dioxide

What does a power company sell to its customers?

Energy

What would be the most likely product(s) of the following reaction

H2O

Which of the following does NOT involve heat transfer by convection

Heat you feel when standing close to a campfire

In which directions on the periodic table do the atomic masses of elements increase

Left to right and top to bottom

Of the following planets, which one is not surrounded by a gaseous atmosphere

Mercury

Which of the following statements are TRUE for the process of dissolving NaCl in water

Na+and Cl-become free ions.

"Pressure applied to an incompressible fluid is transmitted equally throughout the fluid" is an expression of

Pascal's principle

Of the following, the one which most likely involves a chemical reaction is

Placing a solid and a liquid together produces heat and a gas

Water is a solvent in which of the following solutions

Saline (salt) solution

Which of the following statements best describes the difference between series and parallel circuits?

Series circuits have a single path and parallel circuits have two or more paths

Classify the following reaction: 3CuSO4+ 2Al Al2(SO4)3+ 3C

Single-displacement

A chemist is given the job of recovering silver ions, Ag+, from a solution before the solution is discarded. She is given the job because silver is expensive and may be reused.What kind of reaction would the chemist use to extract the silver?

Single-replacement

Which of the following solutes is NOT soluble in water

Solid copper

What is a whole number in a chemical formula indicating the number of atoms in a molecule called

Subscript

Suppose you connect more and more light bulbs in series to a battery. What happens to the brightness of each bulb as you add more bulbs?

The bulbs grow dimmer with each new bulb adde

Which of the following statements about suspensions is TRUE

The large particles in a suspension eventually settle to the bottom of the container

Which of the following statements about two isotopes of the same element is FALSE

The number of protons might be different between the two isotopes

Electric charge is

a fundamental property of matter that comes in two forms

An object is a good emitter of radiation if it is

a good absorber

Evaporation occurs when

a liquid changes to a gas

A solution is

a mixture of two or more substances. It is homogeneous at the molecular level.

Water is described as a polar molecule because it has

a partial positive and a partial negative end

Fourteen-karat gold is

alloy,mixture,solution

The measurement of the force of air molecules in the atmosphere at a given altitude is called

atmospheric pressure

In the periodic table notation below, what information does the number 40.08 tell you. Bottom of the Elements picture

atomic mass

The "building blocks" of matter are:

atoms and molecules

An instrument designed to measure atmospheric pressure is called a:

barometer

The temperature at which water changes to steam is known as the

boiling point

According to Bernoulli's principle, if the speed of a fluid along a streamline increases all of the following may occur EXCEPT

both a pressure and potential energy decrease

Chemical formulas represent the number and element of each type of atom in

both ionic and covalent compounds.

The carbohydrate, ____, is used by plants to give their structure strength

cellulose

According to the periodic table , the group known as the halogens include the element

chlorine

Conduction is the transfer of thermal energy due to

direct contact of particles of matter.

In an electrical circuit, the term current refers to

flowing charges

if you hold a paper cup containing hot chocolate in your hand, thermal energy

flows from the hot chocolate to your hand.

Matter that flows when force is applied is

fluid

The primary source of nitrogen for the proteins in our body tissues is nitrogen

found in plant and animal proteins we eat

32°F or 0°C, the temperature at which liquid water turns to solid ice, is called the

freezing point

A device that protects a circuit from too much current by creating a break in the circuit is a

fuse

In the reaction, 2H2(g)+ --> O2(g)2H2O(l), the phase of matter in which the reactants appear is

gas

Which graph represents the relationship between the Kelvin temperature scale and the Celsius temperature scale

graph a

The noble gases such as helium and xenon do not form chemical bonds with other elements because the

have completely filled energy levels.

When you put ice in a drink to cool it

heat is transferred from the warmer drink to the cooler ice

A mixture containing more than one type of matter, samples of which are not made of the same proportions of matter, is a

heterogeneous mixture

The bond between a water molecule's oxygen atom and the hydrogen atoms of another water molecule is known as a

hydrogen bond

When more devices are added to a series circuit, the total circuit resistance

increases

Using the periodic table in , all of the following elements belong to the main group elements EXCEPT

iron

A closed circuit

is on

In a hydraulic lift, a small cylinder is connected to a large cylinder. A 250-newton force is applied to the 0.0025-square meter area of the small cylinder. Answer the following questions based on this information. Compared to the pressure on the smaller cylinder, the pressure on the larger cylinder

is the same

The location of metals on the periodic table is on the

left.

An ionic bond is most likely to form between

lithium and fluorine atoms

Most of the elements in the periodic table can be described as

metals

The mass, in grams, of the Avogadro number of molecules of a compound is its

molar mass

Compared to aneroid barometers, mercury barometers are less desirable because they are:

more dangerous

An atom absorbs energy as its electron

move from a low energy level to a high energy level

An atom emits light when one of its electrons

moves from a high energy level to a low energy level

The unit most useful for measuring the particle size of a colloid is the

nanometer.

A particle with zero charge found in the nucleus of an atom is called a

neutron

Units used to measure atmospheric pressure include all of the following EXCEPT

newtons

The most abundant gas in Earth's atmosphere is

nitrogen

A way of organizing the elements based on their chemical properties is the

periodic table

An element essential to the manufacture of DNA and glow-in-the-dark plastic is

phosphorus

When you eat an apple, the process of digestion involves

physical and chemical change

Positive electric charges

repel positive charges and attract negative charges

Viscosity is a measure of a material's

resistance to flow

In general, the most dense phase of matter on Earth is

solid

One of the simplest ways to increase the dissolving rate of a spoonful of sugar in a cup of water is to

stir the water

A measure of how much pulling, or tension, a material can withstand before breaking is

tensile strength

Atoms of the same element may contain:

the same number of protons but a different number of neutrons

The second row of the periodic table has 8 elements because

the second energy level can hold 8 electrons

Global wind cells and ocean currents are examples of heat transfer by

thermal convection

All objects would eventually cool to absolute zero by radiating their energy away if they did not receive energy from other objects by

thermal radiation

The noble gases, such as helium and xenon, are non-reactive because

they have completely filled outer electron shells

A non-polar molecule is

unlikely to dissolve in water AND uncharged

Solids retain their shape and size, if kept at constant temperature and pressure. At a constant temperature and pressure, liquids retain their

volume