chemistry

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A chemical change occurs when

a leaf changes color in the fall

A physical change occurs when

a leaf changes color in the fall

Which of the following is not a chemical change

melting

Which of these statements about density is true

Density is a physical property

IF a mixture is not uniform throughout, it is called

Heterogenous

It is easy to determine whether a substance is a metal if the substance is

a good electrical and heat conductor

the standard base unit for mass is the

kilogram

.05 cm is the same as

.5mm

A volume of 1 milliliter is equivalent to

1 cubic centimeter

100 milliliters is equivalent to

1 deciliter

how many minutes are in 1 week

10,080

the liter is define as

1000cm³

1.06 L of water is equivalent to

1060 mL

.25g is equivalent to

250 mg

0.000305 has how many significant figures

3

0.0320 has how many significant figures

3

the number of grams equal to .5 kg is

500

What is a heterogeneous mixture

A heterogeneous mixture is made of different substances that remain physically separate.

The relationship between the mass m of a material, its volume V, and its density D,

D=m/V

Density SI unit

Kg/m³, g/cm³, Kg/L, NOT g/m²

Which of these statements about mass is true

The mass of an object is determined by comparing it to an object of known mass

how should the numbers be rounded when finding the sum of numbers

The number being rounded so the hundreds or the biggest number place is rounded

Under ordinary conditions of temperature and pressure, the particles in a gas are

Very far from one another

A mixture is

a blend of any two or more kinds of matter, as long as each maintains its own unique properties

What is a pure substance

a chemical substance is a material with a specific chemical composition.

A homogeneous mixture is also called

a solution

A compound is

a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances

A measurement that closely agrees with an accepted value is best described as

accurate

A solid substance is

always the same shape regardless of its container

A chemical can be defined as

any substance that has a definite compositon

Plasma is the fourth state of matter, in the plasma state

atoms lose electrons

A nonmetal is usually

brittle

Which of the following is not a physical change?

burning

The quantity of matter per unit volume is

density

Which of the following is an intensive property of matter

density

The density of an object is calculated by

dividing its mass by its volume

The vertical columns on the periodic table are called groups

groups

the liquid state of matter can be describe as

having a definite volume but not a definite shape

If a mixture is uniform in composition, it is said to be

homogeneous

What happens to the energy in a substance when it changes state?

it changes form, but is neither destroyed nor increased

Matter includes all of the following except

light

A state of matter in which a material has no definite shape but has a definite volume is the ___ state

liquid

What is the symbol that represents a unit of volume

mL

A measure of quantity of matter is

mass

The measure of the amount of material

mass

A true statement about is that

mass is determined by comparing the mass of an object with a set of standard masses that are part of a balance

The SI base unit for length is the

meter

A student recorded the following while completing an experiment Color of substance: yellow, shiny powder Effect of magnet: yellow, shiny powder was attracted The student should classify the substance as a

mixture

All known chemical elements are organized into groups based on similar chemical prperties in the

periodic chart

The horizontal groups on the periodic table are called

periods

If repeated measurements agree closely but differ widely from the accepted value these measurements are

precise but not accurate

Nitrogen monoxide and oxygen, both colorless gases, form a red-brown gas when mixed. Nitrogen monoxide and oxygen are called the

reactants

A numerical result is said to have good precision if

repeated measurements agree closely

The SI base unit for time is

second

Metalloids are often

semiconductors

The two most important properties of all matter are

taking up space and having volume

An atom is

the smallest unit of matter that maintains its chemical identity

When density is measured

the temperature should be specified

Noble gases are in group 18, and are best known because they are

unreactive

Which of the following is an extensive property of matter

volume

the unit m³ measures

volume

The pair of quantities determines the density of a material

volume and mass

A change in the force of gravity on an object will affect its

weight

The measure of Earth's gravitational pull on matter

weight


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