Honors Chemistry Unit 1 Test

Change a speed of 72.4 miles per hour to its equivalent in meters per second.

32\.7 m/s

Convert 45.3 cm to its equivalent measurement in mm.

453 mm

A block occupies 0.2587 ft^3. What is its volume in mm^3?

7\.326 x 10^6 mm^3

A block of silver-colored metal with a volume of 65.0 cm^3 has a mass of 750.0 g.  The density of pure silver is 10.5 g/cm^3.  Is the metal pure silver?

11\.5 g/cm^3

The metal is not pure silver

4\.15 cm × 1.8 cm = ?

7\.5cm^2

13\.00 m − 0.54 m = ?

12\.46 m

(1.7  × 10^-5 m)  ⁄  (3.72 × 10^-4 m)  = ?

 6.3 x 10^-9 m^2

The following length measurements were taken by students using several different measuring devices. Find the average of the measurements. Make sure that your answer has the correct number of significant figures. \n 10.05 cm, 10.1 cm, 9.741 cm, 10.6 cm, 10.5 cm

10\.2 cm

Round off the measurement 0.0030955 m to three significant figures.

0\.00310 m

What is the sum of 2.7 g and 2.47 g expressed in the correct number of significant digits?

5\.2 g

What is the product of the number 1000 and the measurement 0.00357 m expressed in the correct number of significant digits?

4 m

Perform the following operation: 3.43 cm x 5.2 cm. Make sure that your answer has the correct number of significant figures.

18 cm^2

Express 0.05 grams in kilograms, using the correct abbreviations

5 x 10^-5

What is the density of an object having a mass of 4.0 g and a volume of 39.0 cubic centimeters?

0\.10 g/cm^3

What is the volume of an object with a density of 7.73 g/cm^3 and a mass of 5.40 x 10^2 g?

69\.9 cm^3

The density of osmium, which is the densest metal, is 22.57 g/cm^3. What is the mass of a block of osmium that measures 1.00 cm x 4.00 cm x 2.50 cm?

226 g

68\.9 (2)


1. Rounded
2. Rounded Result Expressed in Scientific Notation

1. 69
2. 6.9 x 10^1

0\.00923 (2)


1. Rounded
2. Rounded Result Expressed in Scientific Notation

1. 0.0092
2. 9.2 x 10^-3

624 (2)


1. Rounded
2. Rounded Result Expressed in Scientific Notation

1. 620
2. 6.3 x 10^2

the study of the processes that take place in organisms

biochemistry

the study of all chemicals containing carbon

organic chemistry

the study of chemicals that, in general, do not contain carbon

inorganic chemistry

concerned with the mechanism, rate, and energy transfer that occurs when matter undergoes a change

physical chemistry

the study of the composition of matter

analytical chemistry

composed of two or more substances chemically combined in a fixed proportion

compound

process in which substances are changed into different substances

chemical reaction

substance that cannot be changed into simpler substances by chemical means

element

a process in which a liquid is boiled to produce a vapor that is condensed again into a liquid

distillation

describes mixture with a uniform composition

homogeneous

amount of matter an object contains

mass

known or estimated in a measurement

significant figure

the non-SI scale for temperature

Celcius

closeness to true value

accuracy

narrowness of range of measurements

precision

the SI scale for temperature

Kelvin

the force of gravity on an object

weight

the lowest point on the Kelvin scale

absolute zero

a substance formed in a chemical reaction

product

gaseous state of substance that is a liquid or solid at room temperature

vapor

a physical blend of two or more components

mixture

not uniform in composition

heterogeneous mixture

starting substance in a chemical reaction

reactant

part of a sample having uniform composition and properties

phase

Which field of science studies the composition and structure of matter?

chemistry

The study of chemicals that, in general, do not contain carbon is traditionally called what type of chemistry?

inorganic

A theory is a ____.

well-tested explanation for a broad set of observations

A hypothesis is a ____.

proposed explanation for an observation

What is a good example of chemical technology?

development of a coating for non-stick frying pans

The variable that is observed during an experiment is called what type of variable?

dependent

What are examples of things that are considered physical properties of a substance?

color, odor, melting/boiling points, malleability, and hardness

Which state of matter takes both the shape and volume of its container?

gas

Which state of matter is characterized by having a definite shape and a definite volume?

solid

All of the following are physical properties of a substance in the liquid state EXCEPT ____.

a. indefinite volume

b. definite mass

c. not easily compressed

d. indefinite shape

a. indefinite volume

Which of the following is a heterogeneous mixture?

a. air

b. salt water

c. steel

d. soil

d. soil

Which of the following CANNOT be considered a single phase?

a. a pure solid

b. a pure liquid

c. a homogeneous mixture

d. a heterogeneous mixture

d. a heterogeneous mixture

A substance that can be separated into two or more substances only by a chemical change is a(n) ____.

compound

Which of the following represents a compound?

Question 34Select one:

a. H

b. *H-3*

c. H2O

d. O-16

c. H2O

What must occur for a change to be a chemical reaction?

There must be a change in chemical properties.

Which of the following does NOT involve a physical change?

a. mixing

b. melting

c. grinding

d. decomposing

d. decomposing

Which of the following does NOT indicate that a chemical change may have taken place?

a. fracture formation

b. gas production

c. precipitate formation

d. energy transfer

a. fracture formation

What happens to matter during a chemical reaction?

Matter is neither destroyed or created.

What is true for all chemical reactions?

The total mass of the reactants equals the total mass of the products.

Which of the following is a formula?

a. Fe

b. Water

c. H2O

d. Fluorine

c. H2O

In which state of matter do the particles tend to be most closely packed?

solid

Which of the following could be separated by **physical** means?

a. salt water

b. silver

c. sodium chloride

d. rust

a. salt water

Matter is anything that has

mass and occupies space.

The separation of two liquids made possible by a difference in the boiling points of each is

distillation

What would be considered to be unsafe in lab?

horseplay

Which of the following would be best to use for heating water to a boil?

a. watch glass

b. rubber policeman

c. beaker

d. Satchmo

c. beaker

The expression of 5008 km in scientific notation is ____.

5\.008 × 10^3 km

What is the result of multiplying 2.5 x 10^10 by 3.5 x 10^-7?

8\.75 × 10^3

Express the sum of 1111 km and 222 km using the correct number of significant digits.

1333 km

Express the sum of 7.68 m and 5.0 m using the correct number of significant digits

12\.7 m

Express the product of 4.0 x 10^-2 m and 8.1 x 10^2 m using the correct number of significant digits.

3\.2 x 10^1

When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in ____.

the least precise measurement

What is the volume of a salt crystal measuring 2.44 x 10^-2 m by 1.4 x 10^-3 m by 8.4 x 10^-3 m?

2\.9 × 10^–7 m^3

What is the temperature –34C expressed in kelvins?

239 K

A cubic meter is about the same as the volume occupied by a ____.

washing machine

The quantity 44 liters expressed in cubic meters is ____.

0\.044 m^3

Density is found by dividing ____.

mass by volume

What is the density of an object having a mass of 8.0 g and a volume of 25 cm^3?

\n 0.32 g/cm^3

What is the volume of 80.0 g of ether if the density of ether is 0.70 g/mL?

1\.1 x 10^2 mL

What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL?

4\.34 mL

If a liter of water is heated from 20C to 50C, what happens to its volume?

The volume increases.

If the temperature of a piece of steel decreases, what happens to its density?

The density increases.

As the density of a substance increases, the volume of a given mass of that substance ____.

decreases

Discuss the relationship between the terms hypothesis, scientific theory, and scientific law as each relates to observations.

A hypothesis is a proposed explanation for an observation. A scientific theory is a well-tested explanation of a broad set of observations. A scientific law is a rule that is always true which explains an observation

What is the difference between a solution and a heterogeneous mixture? Give 2 examples of each and explain why each example falls into the category you listed. 

A solution is a homogeneous mixture of two or more substances where the particles of one substance are evenly dispersed throughout the other substance(s). The components of a solution cannot be easily separated by physical means.

Ex: Saltwater, Air

A heterogeneous mixture is a combination of two or more substances that are not evenly mixed and can be easily separated by physical means. 

Ex: Oil and Water, Soil

Give an example of a two-phase mixture and describe how you would separate the substances.

An example of a two-phase mixture is sand and water. To separate the sand and water, I would bring the mixture to a boil, so the water would evaporate out, and the sand would stay in the container.

Explain the difference between an element and a compound.  Include examples in your explanation.

An element is the simplest form of matter that has a unique set of properties. A compound is a substance that contains two or more elements chemically combined in a fixed proportion. An element cannot be broken down into simpler components through chemical reactions. Compounds can be broken down into simpler substances through chemical reactions.

Ex: H2O (water) is a compound, and it can be broken down into two elements (H2) and (O) through a chemical reaction.

What does the chemical formula of a compound indicate?  Use examples to illustrate your explanation.

The chemical formula of a compound indicates the type of element and how much of it is in the compound. For example, the chemical formula for water (H2O) reveals that there are 2 Hydrogen atom and 1 Oxygen atom in a water molecule.

Explain the difference between chemical properties and physical properties. Give an example of each.

Physical properties can be measured without needing to make a chemical change to the substance. 

Ex: Color, Melting/Boiling Point, Density, and Hardness

Chemical properties can only be measured and observed by making chemical changes to the substance on a molecular scale.

Ex: Heat of Combustion, Rusting, Burning

Discuss the difference between physical changes and chemical changes. Use an example to illustrate the difference.

A physical change is any change that does not alter the identity of the substance. A chemical change is any change that changes the identity of the substance. (Can also be called chemical reactions)

Ex: A physical change is boiling, but a chemical change is combustion. Combustion is irreversible, and boiling is reversible. 

State the Law of Conservation of Mass.

If the Law of Conservation of Mass appears to be violated, what is likely to be the explanation?

What would the total mass of products be if 10 grams of water decomposes to produce hydrogen and oxygen?

The Law of Conservation of Mass states that mass cannot be created nor destroyed.

The likely explanation of a violation of the law of conservation of mass is that the substance changed states of matter into a gas and escaped into the atmosphere.

The total mass of the products would be 10 grams

Explain the difference between the Celsius and Kelvin temperature scales.  Use comparable temperatures in your discussion.

Celcius is used by people around the world, and Kelvin is used by scientists. The difference between the C and Kelvin is 273 degrees. Ex: Water freezes at 0 degrees C and at 273 degrees Kelvin.

Explain the difference between mass and weight. Provide an example to illustrate the distinction.

Mass is the amount of matter an object contains and weight is a force that measures the pull of gravity on a given mass.

Ex: On the moon, your mass is the same, but your weight is different due to the weaker gravity pull.

Why is the metric system the preferred system of measurement for science?

Because it is a base 10 system, and it is universally used.

Explain the difference between precision and accuracy. Suppose you made three different mass measurements of a sugar sample you knew to have a mass of 1 g. How would you know whether or not the measurements were accurate? How would you know whether or not they were precise? Could the three measurements be precise, but not accurate? Explain.

Accuracy is the degree of closeness to the true value. Precision is the degree to which an instrument or process will repeat the same value.

Ex: If the 3 measurements were all around the same number then it is precise, but if they are all close to 1 g then the measurements are accurate. Yes, the measurements can be precise but not accurate: if the numbers were all close to 2 g, then it would be a precise measurement, but because they are not close to 1 g, the measurement is not accurate.

What is an extensive property?

a property that depends on the amount of matter in a sample

What is an intensive property?

a property that DOES NOT depend on the amount of matter in a sample