Quiz about Science Midterm Review

Question 1

Describe the movement of molecules as a substance changes from solid to liquid.

Accepted Answer

The speed of the molecules increases because they have higher kinetic energy in the liquid state.

Answer

The speed of the molecules decreases because they have higher kinetic energy in the liquid state.

Answer

The speed of the molecules increases because they have lower kinetic energy in the liquid state.

Answer

The speed of the molecules decreases because they have lower kinetic energy in the liquid state.

Question 2

Describe the movement of molecules as a substance changes from liquid to gas.

Accepted Answer

The speed of the molecules increases because they have higher kinetic energy in the gas state.

Answer

The speed of the decreases because they have higher kinetic energy in the gas state.

Answer

The speed of the molecules decreases because they have lower kinetic energy in the gas state.

Answer

The speed of the molecules increases because they have lower kinetic energy in the gas state.

Question 3

Describe the movement of molecules as a substance changes from gas to liquid.

Accepted Answer

The speed of the molecules decreases because they have lower kinetic energy in the liquid state.

Answer

The speed of the decreases because they have higher kinetic energy in the liquid state.

Answer

The speed of the molecules increases because they have higher kinetic energy in the liquid state.

Answer

The speed of the molecules increases because they have lower kinetic energy in the liquid state.

Question 4

Elements in this category have similar chemical properties. Select two answers.

Accepted Answer

groups

Accepted Answer

families

Answer

periods

Answer

transition

Question 5

Horizontal rows on the periodic table are called _____.

Accepted Answer

periods

Answer

transition

Answer

groups

Answer

families

Question 6

Vertical columns on the periodic table are called _____. Select two answers.

Accepted Answer

groups

Accepted Answer

families

Answer

transition

Answer

periods

Question 7

Use your periodic table to determine which element contains 11 protons and 10 electrons.

Accepted Answer

an ion of sodium

Answer

a neutral sodium ion

Answer

a neutral neon ion

Answer

an ion of neon

Question 8

Use your periodic table to determine which element contains 20 protons and 19 electrons.

Accepted Answer

an ion of calcium

Answer

a neutral potassium ion

Answer

an ion of potassium

Answer

a neutral calcium ion

Question 9

Use your periodic table to determine which element contains 12 protons and 11 electrons.

Accepted Answer

an ion of magnesium

Answer

a neutral magnesium ion

Answer

an ion of sodium

Answer

a neutral sodium ion

Question 10

Which two subatomic particles determine an atom's mass? Select two answers.

Accepted Answer

neutrons

Accepted Answer

protons

Answer

electrons

Answer

atomic number

Question 11

Which subatomic particle determines the identity of an atom?

Accepted Answer

protons

Answer

electrons

Answer

neutrons

Answer

mass number

Question 12

Which two subatomic particles can be found in an atom's nucleus? Select two answers.

Accepted Answer

neutrons

Accepted Answer

protons

Answer

electrons

Answer

mass number

Question 13

Why is the charge of a neutral atom equal to zero?

Accepted Answer

The number of protons is equal to the number of electrons.

Answer

The number of protons equal the number of neutrons.

Answer

The number of protons is greater than the number of neutrons.

Answer

The number of protons is greater than the number of electrons.

Question 14

How many electrons are there in a neutral atom of magnesium?

Accepted Answer

12 electrons

Answer

2 electrons

Answer

13 electrons

Answer

24 electrons

Question 15

How many electrons are there in a neutral atom of silicon?

Accepted Answer

14 electrons

Answer

4 electrons

Answer

15 electrons

Answer

28 electrons

Question 16

Use your periodic table to determine how many protons, electrons, and neutrons there are in a neutral atom of an element that has an atomic number of 16 and a mass number of 36?

Accepted Answer

16 protons, 16 electrons, and 20 neutrons

Answer

36 protons, 36 electrons, and 16 neutrons

Answer

20 protons, 20 electrons, and 16 neutrons

Answer

16 protons, 16 electrons, and 36 neutrons

Question 17

Which statement best explains why noble gases (group 18) are inert (unreactive)?

Accepted Answer

Their outermost energy level is full.

Answer

They can have either a positive or a negative charge.

Answer

Their outermost energy level is missing one electron.

Answer

They tend to give up all of their valence electrons easily.

Question 18

How many valence electrons are there in elements that are under group 18?

Accepted Answer

8 electrons

Answer

2 electrons

Answer

4 electrons

Answer

18 electrons

Question 19

What is the name of this element?

Accepted Answer

Beryllium

Answer

Boron

Answer

Barium

Answer

Bromine

Question 20

What element is represented by this image?

Accepted Answer

phosphorus

Answer

carbon

Answer

silicon

Answer

sulfur

Question 21

What property of matter is being investigated in this experiment?

Accepted Answer

density

Answer

viscosity

Answer

fluidity

Answer

surface tension

Question 22

What is the kind of bond between a metal and a nonmetal called?

Accepted Answer

Ionic

Answer

Covalent

Answer

Lattice

Answer

Metallic

Question 23

What is the kind of bond between two non metals called?

Accepted Answer

Covalent

Answer

Ionic

Answer

Lattice

Answer

Metallic

Question 24

Covalent bond forms between....

Accepted Answer

Nonmetals that share electrons

Answer

Metals that transfer electrons

Answer

Nonmetal and a Metal that share electrons

Answer

Metal and a Nonmetal that transfers electrons

Question 25

Ionic bond forms between....

Accepted Answer

Metal and a Nonmetal that transfers electrons

Answer

Nonmetals that share electrons

Answer

Metals that transfer electrons

Answer

Nonmetal and a Metal that share electrons

Question 26

How many nitrogen atoms and oxygen atoms are there in dinitrogen tetroxide?

Accepted Answer

two nitrogen atom and four oxygen atoms

Answer

two nitrogen atoms and three oxygen atoms

Answer

one nitrogen atom and two oxygen atoms

Answer

three nitrogen atoms and one oxygen atom

Question 27

How many carbon atoms and chlorine atoms are there in carbon tetrachloride?

Accepted Answer

one carbon atom and four chlorine atoms

Answer

one carbon atom and one chlorine atoms

Answer

no carbon atoms and four chlorine atoms

Answer

four carbon atoms and one chlorine atom

Question 28

What is the chemical formula when magnesium and nitrogen form a compound?

Accepted Answer

Mg3N2

Answer

MgN

Answer

Mg2N3

Answer

none of these

Question 29

What is the chemical formula for the ionic compound formed between aluminum and sulfur atoms?

Accepted Answer

Al2S3

Answer

AlS

Answer

Al3S2

Answer

cannot be determined

Question 30

What is the chemical formula for the ionic compound formed between potassium and oxygen atoms?

Accepted Answer

K2O

Answer

KO

Answer

KO2

Answer

none of these

Question 31

What type of change occurs when you grind (crush) a piece of chalk into powder?

Accepted Answer

Physical change. A new substance was NOT formed.

Answer

Chemical change. A new substance was formed.

Answer

Chemical change. A new substance was NOT formed.

Answer

Physical change. A new substance was formed.

Question 32

Why are alkali metals extremely reactive?

Accepted Answer

They only need to lose one valence electron.

Answer

They only need to lose two valence electrons.

Answer

They are metals at room temperature.

Answer

They have small atomic masses.

Question 33

What type of change occurs when ice melts to water and then evaporates as gas?

Accepted Answer

Physical change. A new substance was NOT formed.

Answer

Chemical change. A new substance was formed.

Answer

Chemical change. A new substance was NOT formed.

Answer

Physical change. A new substance was formed.

Question 34

What happens to thermal energy (heat) as water transforms from the gaseous state to the liquid state?

Accepted Answer

Remove energy from the sample.

Answer

Add mass to the sample.

Answer

Add energy to the sample.

Answer

Remove mass from the sample.

Question 35

Which law best describes the mass of a tree and oxygen equal to the total mass of the remaining ash and gases of the tree after it is burned down to ashes?

Accepted Answer

The Law of Conservation of Mass

Answer

The Law of Equal Masses

Answer

The Law of Matter

Answer

The Law of Equal Atoms

Question 36

Isotopes of the same element have different

Accepted Answer

number of neutrons

Answer

number of protons

Answer

number of electrons

Answer

atomic number

Question 37

Why do some substances float on water?

Accepted Answer

they are less dense than water

Answer

they are warmer than water

Answer

they are cooler than water

Answer

they are more dense than water

Question 38

What is the formula for density?

Accepted Answer

density = mass / volume

Answer

density = mass x volume

Answer

density = mass + volume

Answer

density = mass - volume

Question 39

Sid has a solid box. The density of the box is 9 g/cm³. What is the mass of the box if it has a volume of 3 cm³?

Accepted Answer

27 g

Answer

3 g

Answer

6 g

Answer

9 g

Question 40

Which one indicates that a chemical reaction has NOT occurred when you combine two different elements?

Accepted Answer

The substance dissolved.

Answer

A new substance had formed.

Answer

Bubbling had occurred.

Answer

There was some flammability.

Question 41

In a chemical equation the mass of the reactants is

Accepted Answer

equal to the mass of the products

Answer

more than the mass of the products

Answer

less than the mass of the products

Answer

twice the amount than the mass of the products

Question 42

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns? (select two)

Accepted Answer

A new substance is produced

Accepted Answer

The product has different chemical properties than the reactant

Answer

The shape of the coal changes

Answer

Oxygen is present

Question 43

The Law of Conservation of Mass states

Accepted Answer

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Answer

that matter exists in all states and reacts the same

Answer

that matter can only be changed into new substances by introducing a catalyst

Answer

that matter exists in the same state throughout any chemical change

Question 44

What type of reaction is the following chemical equation?

Accepted Answer

single displacement

Answer

combustion

Answer

synthesis

Answer

decomposition

Answer

double displacement

Question 45

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

Accepted Answer

4Fe + 3O₂ -> 2Fe₂O₃

Answer

2 Fe + 3O₂ -> Fe₂O₆

Answer

4 Fe + O₆ -> 2Fe₂O₃

Answer

None of the options are correctly balanced.

Question 46

Balance this equation.
_CF₄+ _Br₂-- _CBr₄+ _F₂

Accepted Answer

1,2,1,2

Answer

2,1,2,1

Answer

1,2,2,1

Answer

2,2,2,2

Question 47

Balance this equation
_Al +_HCl --> _H₂+_AlCl₃

Accepted Answer

2, 6, 3, 2

Answer

it is already balanced

Answer

4, 12, 3, 4

Answer

2, 1, 4, 5

Question 48

Students react baking soda & vinegar in a plastic bag. Bubbles formed when these two substances were mixed.

Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?

Accepted Answer

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.

Answer

Bubbles were produced during the reaction, and they were not calculated in the mass of the chemical reaction.

Answer

The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

Question 49

Which of the following is an example of decomposition?

Accepted Answer

KClO₃--> KCl + O₂

Answer

Na + Br₂--> NaBr

Answer

HgO + Cl₂-->HgCl + O₂

Answer

Cl₂ + NaBr --> NaCl + Br₂

Question 50

This chemical equation is described by this type of chemical reaction.

Accepted Answer

double displacement

Answer

synthesis

Answer

single displacement

Answer

decomposition

Answer

combustion

Question 51

What happens with the water molecules after it goes through a decomposition process?

Accepted Answer

The water molecule separates into oxygen atoms and hydrogen atoms.

Answer

The hydrogen atoms and oxygen atoms combine to form one molecule.

Answer

The water molecules evaporate.

Answer

The atoms are destroyed after the reaction.

Question 52

How can you speed up the rate at which a sugar cube dissolves in water?

Accepted Answer

Heat the water.

Answer

Do not stir the sugar in the water.

Answer

Place a large sugar cube in the water.

Answer

Remove the ions.

Question 53

__________________ is the process in which two or more smaller nuclei combine to create a larger, more stable nuclei.

Accepted Answer

Nuclear Fusion

Answer

Nuclear Decay

Answer

Nuclear Fission

Answer

None of the above

Question 54

Classify this process.

Accepted Answer

Nuclear fusion

Answer

Nuclear fission

Answer

Alpha decay

Answer

Beta decay

Question 55

The helium nucleus is represented by this type of item.

Accepted Answer

alpha particle

Answer

neutron

Answer

beta particle

Answer

gamma ray

Question 56

After how many minutes, would the mass of selenium-83 remaining, be 2.5 mg?

Accepted Answer

100 minutes

Answer

50 minutes

Answer

75 minutes

Answer

125 minutes

Question 57

The wick of a candle is burning as the wax of the candle melts, drips down the side of the candle, and hardens at the base of the candle. Describe the physical and chemical changes that are occurring during this process. (Select two answers)

Accepted Answer

Chemical change is occurring when the wick is burning.

Accepted Answer

Physical change is occurring as the melted wax solidifies at the base of the candle.

Answer

Physical change is occurring when the wick is burning.

Answer

Chemical change is occurring as the melted wax solidifies at the base of the candle.

Question 58

Kearstin and Alyah found four different bottles filled with unknown pure liquids. They measure the properties of each liquid. The measurements are displayed in the data table below. They wonder if any of the liquids are the same substance.

Accepted Answer

Liquids 2 and 3 are the same substance because both have the same density and the same boiling point.

Answer

Liquids 1 and 2 are the same substance because both have the same color and the same volume.

Answer

It is difficult to determine which two substances are the same. The data table is difficult to read.

Answer

None of the substances are the same. All of the liquids are different from each other.

Question 59

These are the data and results collected of several elements that were tested in a lab. Identify the identity of an unknown element that conducts electricity and reacts with nonmetals. Which element from the data table is most likely the unknown element? Support your claim and reasoning to justify your answer.

Accepted Answer

Element 2. It conducts electricity and reacts with nonmetals.

Answer

Element 1. It conducts electricity and is very reactive.

Answer

Element 3. It does not conduct electricity and is unreactive.

Answer

Element 4. It does not conduct electricity and reacts with alkali metals.

Question 60

Which state of matter matches with its description?

Accepted Answer

Liquid - no fixed shape (take the shape of its container); definite (fixed) volume.

Answer

Solid - no fixed shape (cannot measure its shape); no fixed volume (cannot measure its volume).

Answer

Gas- definite shape (has its own shape); definite (fixed) volume.

Answer

Plasma- has definite shape (has its own shape); no fixed volume (cannot measure its volume).

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