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### b

The two most important properties of all matter are:

(a.) the ability to carry an electric current well and to hold electric charge

(b.) taking up space and having mass

(c.) being brittle and hard

(d.) being malleable and ductile

### Compound

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

### d

A true statement about mass is that:

(a.) mass is often measured with a spring scale

(b.) mass is expressed in pounds

(c.) as the force of Earth's gravity on an object increases, the object's mass increases

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

### Mixture

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(n)

### d

Which of the following is not a physical change?

(a.) grinding

(b.) cutting

(c.) boiling

(d.) burning

### c

Which of the following is not a chemical change?

(a.) rusting

(b.) igniting

(c.) melting

(d.) burning

### Reactants

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

### b

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

(a.) closely packed

(b.) very far from one another

(c.) held in fixed positions

(d.) unevenly distributed

### c

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

(a.) It is destroyed

(b.) It is changed into matter

(c.) It changes form, but it is neither destroyed nor increased

(d.) The energy remains unchanged

### c

The only pure substance listed below is:

(a.) bread dough

(b.) vinegar (5% acetic acid)

(c.) vitamin C (ascorbic acid)

(d.) seawater

### Mixture

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

### Periodic Chart

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

### d

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

(a.) easy to break down into its components

(b.) very hard

(c.) very brittle

(d.) a good electrical and heat conductor

### c

All of the following are steps in the scientific method except:

(a.) observing and recording data

(b.) forming a hypothesis

(c.) discarding data inconsistent with the hypothesis

(d.) developing a model based on experimental results

### Theory

Accepted as the explanation of an observed phenomenon until repeated observations conflict with it

### b

Standards of measurement are chosen because they:

(a.) can be related to everyday objects

(b.) are reproducible in another laboratory

(c.) cannot be destroyed by any common physical or chemical means

(d.) are easily changed

### c

Which of these statements does not describe a measurement standard?

(a.) Measurement standards avoid ambiguity

(b.) Measurement standards must be unchanging

(c.) A standard can be easily changed to suit the experiment

(d.) Confusion is eliminated when the correct measurement is applied

### c

Which of these statements about units of measurements is not true?

(a.) A unit compares what is being measured with a previously defined quality

(b.) A unit is usually preceded by a number

(c.) Measurements can be compared without knowing their units

(d.) The choice of unit depends on the quantity being measured

### d

Which of these statements about mass is true?

(a.) Mass is expressed in pounds or newtons

(b.) Mass is usually measured with a spring scale

(c.) The mass of an object depends on the force of gravity acting on it

(d.) The mass of an object is determined by comparing it to an object of known mass

### b

The density of an object is calculated by

(a.) multiplying its mass times its volume

(b.) dividing its mass by its volume

(c.) dividing its volume by its mass

(d.) adding its mass to its volume

### c

Which of these statements about density is true?

(a.) Larger objects are more dense

(b.) Density does not depend on temperature

(c.) Density is a physical property

(d.) The density of an object depends on the force of gravity

### 4.05 g

The density of aluminum is 2.70 g/cm³. What is the mass of a solid piece of aluminum with a volume of 1.5 cm³?

### 19.3 g/cm³

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm³. The density of the gold is ___

### 0.071 cm³

The density of pure diamond is 3.5 g/cm³. What is the volume of the diamond with a mass of .25 g?

### d

100 milliliters is equivalent to:

(a.) 1 hectoliter

(b.) 1 microliter

(c.) 1 centiliter

(d.) 1 deciliter

### b

A numerical result is said to have good precision if

(a.) it agrees closely with an accepted value

(b.) repeated measurements agree closely

(c.) it has a small number of significant figures

(d.) it is a large whole number

### precise, but not accurate

These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 8.83 g; 8.84 g; 8.82g. The mass of products from that reaction is 8.60 g. The values are __

### Poor precision

A chemist obtained the values 5.2246g, 5.2353 g, and 5.2501 g for the mass of a sample. Without knowing the true mass of the sample, it can be said that these values have ___

### b

For numbers less than 0.1, such as 0.06, the zeros to the right of the decimal point but before the first nonzero digit:

(a.) are significant

(b.) show the decimal place of the first digit

(c.) show that the zero on the left side of the decimal is not significant

(d.) show uncertainty

### c

When adding numbers the sum should be rounded so that the final digit is in the same place as the:

(a.) rightmost digit of the numbers added

(b.) last digit in the longest number added

(c.) leftmost digit of the numbers added

(d.) lefmost digit of the shortest number added

### b

Which of these measurements has been expressed to three significant figures?

(a.) 0.052 g

(b.) 0.202 g

(c.) 3.065 g

(d.) 500 g

### c

Which of these measurements has been expressed to four significant figures?

(a.) 0.0020 mm

(b.) 0.0402 mm

(c.) 30.00 mm

(d.) 402.10 mm

### a

Which of these measurements has only nonsignificant zeros?

(a.) 0.0037

(b.) 60.0

(c.) 400.

(d.) 506

### 17.2 cm²

Using a metric ruler with 1 mm divisions, the sides of a rectangular piece of plywood were measured as 3.54 cm and 4.85 cm, which corresponds to an area of 17.1690 cm². What is the area expressed correctly?

### 4.1 cm³

The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as ___

### 4.5 g

Three samples of 1.12g, 1.8 g, and 1.562 g are mixed together. The combined mass of the three samples, expressed to the correct number of significant figures, would be recorded as ___

### 3

How many significant figures would the answer to the following calculation have?

3.475 x 1.97 + 2.4712

### 3 x 10⁵

The speed of light is 300,000 km/s. In scientific notation, this speed is written to one significant figure as ___

### 3.86 x 10⁵

The average distance between the Earth and the moon is 386,000 km. Expressed in scientific notation, this distance would be expressed as ___

### 1 x 10⁻⁴

An analytical balance can measure mass to the nearest 0.0001 g. In scientific notation, the accuracy of the balance would be expressed as ___

### 2.5 x 10⁻²

The capacity of a Florence flask is 250 mL. Its capacity in liters expressed in scientific notation is ___

### c

Which of these statements about y=kx is not true?

(a.) y is directly proportional to x

(b.) x is a variable

(c.) The product of y and x is a constant

(d.) The graph of y versus x is be a straight line

### d

Which of these equations does not describe an inverse proportionality between x and y?

(a.) xy=k

(b.) x=k/y

(c.) y=k/x

(d.) k=x/y

### a

Which of the following does not describe a direct proportionality between x and y?

(a.) xy=k

(b.) x/y=k

(c.) y/x=k

(d.) x=ky