question 1 how can you tell a chemical change occurred? a. two substances are mixed together b. new...

Question 1

How can you tell a chemical change occurred?

A. Two substances are mixed together

B. New atoms are being formedC. A new substance formsD. A liquid is formed

Question 2

Noble gases found in group 18 are special because:

A. They react very easilyB. They always gain electronsC. They have the same number of

energy levelsD. They do not react

Question 3

P3 + 3O2 2 P2O3

In the equation above, how many atoms of phosphorus are in the product?

A. 3B. 4C. 2D. 5

Question 4

Which of the following is NOT a compound?

A. O2

B. NaClC. H2OD. H2SO4

Question 5

All of the following are evidences of a chemical reaction except:

A. Solid Precipitate formedB. BoilingC. Temperature ChangeD. Gas Produced/Bubbling

Question 6

Which of these will balance the equation?

3Na2 + 3CO2 ________ + 6NaO

A. CO2

B. 3CC. 6CD. 6CO2

Question 7

Which equation below represents the Law of Conservation of Mass?

A. 2Ca + 2H2O Ca2O + H2

B. Al2SO4 + O2 2AlS + O6

C. Mg (OH)2 H2O2 + Mg

Question 8

How many atoms are in 3H2SO4

A. 3B. 10C. 21D. 24

Question 9

How many neutrons does Sodium have?

Question 10

Which substance has the most elements?

A. H2O2

B. NaClO4

C. O2

D. 2H2O

Question 11

2HCl3 + O4

The 2 in front of the HCl3 is called a coefficient. What does this tell us?

A. There are 2 atoms of HydrogenB. There are 6 molecules of HCl3

C. There are 6 atoms of ChlorineD. There are 2 molecules of HCl3

Question 12

20 ml of solution A is combined with 30 ml of solution B. A chemical reaction occurs where bubbles are produced. After the reaction, 40 ml of solution remains. How much gas is produced?

A. 10 mlB. 30 mlC. 40 mlD. 50 ml

l

Question 13

What season is it in the southern hemisphere in diagram A?

Question 14

Which of the following represents the highest tides?

A.

B.

C.

D. All of the positions

Question 15

An element has a metallic-gray appearance.

It also has the properties of both a metal and a nonmetal. In which section of the periodic table would the element most likely be found? (which color section)

Question 16

Which characteristic below is true of nonmetals?A.They are opaqueB.They are good conductors of electricityC.They have a high lusterD.They are very brittle

Question 17

A lunar eclipse happens because:

A. The moon passes directly behind the earth

B. The moon orbits the earth in an elliptical pattern

C. The moon passes directly between the sun and earth

D. The shadow of the moon blocks the earth

Question 18

Why does the earth experience seasons?

A. The earth spins on its tilted axisB. The earth rotates around the sunC. The sun hits the equator more

directlyD. The earth revolves around the sun

Question 19

A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?

A Heat is added to the sugar crystals. B The sugar melts and becomes a liquid. C The temperature of the sugar increases. D Gas is produced as the sugar turns black.

Question 20

Between what two points will the moon appear to change from a quarter moon to a new moon?A. S to TB. T to QC. Q to RD. R to S

Question 21

How many valence electrons are in an atom with an atomic number of 6?

A. 2 B. 4 C. 6 D. 8

Question 22

Groups on the periodic table tell us:

A. The number of energy levelsB. The number of protons &

electronsC. The number of valence electronsD. Whether an element is a metal or

non-metal

Question 23Name this moon phase

Question 24

Which two subatomic particles contribute the most to the mass of an atom?

A. Protons and electrons B. Protons and neutrons C. Neutrons and electrons D. Protons and photons

Question 25

Earth’s land areas, oceans, and atmosphere maintain fairly constant average temperatures. What is the best explanation for these constant average temperatures?

A. Earth’s Northern Hemisphere and Southern Hemisphere have opposite seasons. B. Earth is tilted and rotates daily on its axis. C. The continuous motion of air and water distributes the sun’s energy. D. Global weather systems generally move from west to east.

Question 26

How many protons does Sodium (Na) contain?

A. 11B. 23C. 12D. 1

Question 27

What moon phase will an observer fromEarth see at position 4?

Question 28

Which of the following correctly lists the particles in a helium atom?

A. 1 proton, 1 neutron, 1 electron B. 1 proton, 2 neutrons, 2 electrons C. 2 protons, 2 neutrons, 2 electrons D. 2 protons, 2 neutrons, 4 electrons

Question 29

All elements in the same period have the:A. Same number of valence electronsB. Same number of energy levelsC. Same atomic numberD. Same number of total electrons

Question 30

Which subatomic particle determines the identity of the element?

A. NeutronsB. ProtonsC. ElectronsD. Valence Electrons

Question 31

If an atom has 18 Protons and 22 Neutrons, approximately what is its

atomic mass? A. 40 amuB. 4 amuC. 18 amuD. 8 amu

Question 32

• Which of the following groups of elements from the periodic table belong to a classification of elements that tend to all have properties that include malleability, easily corroded, good conductors of electricity, and luster?

A. Group 12 B. Group 14 C. Group 17 D. Group 18

Question 33

How many valence electrons does Nitrogen have?

A. 2B. 5C. 15D. 7

Question 34

Which of the following elements is the most reactive?

A. BromineB. KryptonC. NitrogenD. Potassium

Question 35

Which element is least reactive?

A. Mercury B. Sodium C. Calcium D. Argon

Question 36

What moon phase will an observer fromEarth see at position 8?

Question 37

High pressure systems are associated with:

A. Sunny, warmer daysB. Sunny, cooler daysC. Cloudy, warmer daysD. Cloudy, cooler days

Question 38

The southwestern tip of the African coast has a cooler climate than cities more inland. Why is this true?

A. It is closer to the equatorB. It receives less rainfall C. Its climate is cooler due to a cold front D. Its climate is cooler due to the cold ocean current

Question 39

How will the weatherchange as you drive fromAustin to El Paso, TX?

A. Stormy weather due to a low pressure systemB. Warmer weather from driving away from the cold frontC. Cooler weather from driving into a cold frontD. Cooler weather due to a high pressure system

Question 40

In a convection current, cold air will sink below warmer air, therefore pushing the warmer air upward. What can be said about the density of cold air versus warm air?

A. Cold air is less dense because the molecules are moving around faster

B. Cold air is more dense because the molecules are moving around slower

C. Cold air is more dense and will riseD. Cold air is less dense because the molecules are moving

around slower