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Worksheets9 Weeks Test Review
Total questions: 88
Worksheet time: 44mins
1. A subatomic particle that has a negative charge is called an
Molecule
Electron
Element
Compound
2. What is an atom’s nucleus made of?
Protons and neutrons
Only neutrons
Only protons
Protons and electrons
3. An element’s atomic number is equal to its number of
Protons
Neutrons
Neutrons and electrons
Protons and neutrons
4. What is the atomic mass of an element that has 19 protons, 19 electrons, and 20 neutrons?
19
20
39
58
5. Oxygen’s atomic number is 8. This means that an oxygen atom has
Eight neutrons
Eight protons and neutrons
Eight protons
Eight neutrons and electrons
6. Which of the following groups is the most reactive?
Alkali metals
Transition metals
Metalloids
Noble gases
7. All of the following elements are metals EXCEPT:
Calcium (Ca)
Chlorine (Cl)
Potassium (K)
Gold (Au)
8. What can you infer about elements that are in the same group?
They will have the same atomic mass
They will display similar physical and chemical properties
They will contain the same number of protons
They will contain the same number of neutrons
9. Group 18 on the periodic table contains elements that are:
Always solids
Very reactive
Stable and unreactive
Metals
10. Which of the following is a chemical property?
Highly flammable
Mass of 15 kilograms
Smooth texture
Golden color
11. What is a physical change?
Burning natural gas
Chopping onions
Digesting food
Exploding dynamite
12. The following are all physical properties EXCEPT:
Ability to be bent
Ability to rust
Ability to be cut
Ability to melt
13. Solubility is a:
Chemical property
Physical property
Chemical change
Physical change
14. You decide to bake a cake. Which of the following actions describes a chemical change?
Tearing open the cake mix
Mixing the ingredients together in a bowl
Baking the cake in the oven
Slicing the cake into pieces
15. Which of the following is NOT a sign of a chemical change?
Change in state
Change in odor (smell)
Change in color
Formation of a new substance
16. You decide to bleach your hair. This process changes your hair from dark brown to light blond. What has occurred?
A physical change
A chemical property
A physical property
A chemical change
17. Valence electrons are the:
Electrons in the outermost shell of an atom
Subatomic particles found in the center of an atom
Electrons in the first shell of an atom
Subatomic particles with a positive charge
18. How many valence electrons does an atom need in order to be stable?
2
6
8
12
19. Which of the following substances would be considered a compound?
N2
C
Ag
H2O
20. The compound KBr contains:
1 atom of K and 1 atom of Br
1 atom of K, 1 atom of B, and 1 atom of r
1 atom of KBr
0 atoms of K and 2 atoms of Br
21. An atom of fluorine (F) is most likely to bond with
Sodium (Na)
Boron (B)
Strontium (Sr)
Sulfur (S)
22. The element iodine (I) is so reactive because:
It is a metal
It has 7 valence electrons
It has a full valence shell
It is a gas
23. The chemical formula for hydrogen peroxide is H2O2. With this formula, you can see that hydrogen peroxide has:
More hydrogen (H) than oxygen (O)
The same amount of oxygen (O) and hydrogen (H) atoms
Less hydrogen (H) than oxygen (O)
No oxygen (O) and some hydrogen (H)
24. The compound H2S contains:
1 atom of hydrogen (H)
2 atoms of sulfur (S)
2 atoms of hydrogen (H)
0 atoms of sulfur (S)
25. Sulfuric acid is made of two hydrogen atoms (H), one sulfur atom (S), and four oxygen atoms (O). What is its molecular formula?
HSO
H2SO4
HSO4
H2SO
What change would make the atom in this image have the same electron configuration as a noble gas?
Gaining one electron
Gaining two electrons
Losing one electron
Losing two electrons
Which of the following elements would be most likely to form an ionic bond?
Sulfur (S) and oxygen (O)
Nitrogen (N) and fluorine (F)
Argon (Ar) and helium (He)
Lithium (Li) and bromine (Br)
The atoms of noble gases do NOT bond easily with other atoms because?
They are always gases
They have no valence shells
They have too many protons and neutrons
They have eight electrons in their valence shells
Which of the following is NOT evidence that a chemical reaction has occurred?
The temperature of the substance changes
The substance changes state
The substance produces a foul odor (smell)
The chemical properties of the substance change
What are the products in the chemical reaction in this image?
Methane and carbon dioxide
Oxygen and water
Carbon dioxide and water
Methane and oxygen
What are the reactants in the chemical reaction in this image?
Potassium nitrate
Potassium oxide
Potassium oxide, nitrogen, and oxygen
Potassium nitrate, potassium oxide, nitrogen, and oxygen
Which of the following is a TRUE statement about the reaction between methane and oxygen?
Oxygen reacts with methane to form water only
The carbon in methane reacts with oxygen to form carbon dioxide
Oxygen and water react and form carbon dioxide
Methane and oxygen form only carbon dioxide as a product
In a chemical reaction, what is broken and reformed?
Nucleus of atoms
The atomic numbers of atoms
The electrons of atoms
The bonds between atoms
Which of the following about chemical reactions is TRUE?
Chemical reactions begin with the products and end with reactants
The number of atoms are different on both sides of the equation
Chemical reactions begin with reactants and end with products
Chemical reactions do not require energy
Which of the following elements would most likely form a covalent bond?
Sulfur (S) and oxygen (O)
Calcium (Ca) and chlorine (Cl)
Sodium (Na) and fluorine (F)
Magnesium (Mg) and sulfur (S)
A chemical reaction is:
a process in which starting substances change into different substances
a form of matter with a unique composition
an interaction between two substances in which one breaks apart and intermingles with the other
the result of a change in energy in the particles of a substance
If two atoms share electrons (like the atoms in this image), what type of bond will most likely form?
Covalent
Ionic
Metallic
Hydrogen
Which would most likely be joined by an ionic bond?
A positive metal ion and a positive nonmetal ion
A positive metal ion and a negative nonmetal ion
A negative metal ion and a negative nonmetal ion
Two neutral nonmetal atoms
A group of Tupelo Middle School students collected rain outside their classroom, then tested the pH of the rain they collected. The pH of the rain was 5.6. What does this tell you about the rain?
The rain is a base.
The rain is acidic, therefore it is acid rain.
The rain is neutral.
Nothing can be determined about the rain.
Distilled water has a pH of 7. This means that the water is:
Acidic
Neutral
Basic
Alkaline
This table shows the pH and reaction to litmus of four body fluids. These data indicate that gastric juice is
Very acidic
Very basic
Slightly acidic
Slightly basic
The solution in this image has a pH of 2. The red compounds represent which kind of ion?
Hydrogen ions (H+)
Hydroxide ions (OH-)
Hydronium ions (H3O+)
Oxygen ions (O-)
Which of the following substances would neutralize a solution with a pH of 1.5?
Milk (pH 6.4)
Vinegar (pH 3.0)
Lye (pH 13.0)
Coffee (pH 5.0)
A scientist collects the data in this image using litmus paper. Blue litmus paper is a pH indicator that turns red when placed in an acidic solution. Red litmus paper turns blue when placed in a basic solution. Neutral solutions cause no change in either color of litmus paper. Which sample solution is a base?
Solution 1
Solution 2
Solution 3
Solution 4
The equation in this image shows what happens when hydrogen iodide (HI) is placed in water. What does this reaction tell you about hydrogen iodide?
It is a base
It is neutral
It is an acid
It is not reactive
You leave some ice cubes in a glass. Eventually, the ice cubes absorb heat and melt.
Exothermic
Endothermic
The following is the equation for photosynthesis: 6 H2O + 6 CO2 + energy → C6H12O6 + 6 O2
Exothermic
Endothermic
You decide to mix powdered laundry detergent with water. The temperature of this mixture rises by 6°F.
Exothermic
Endothermic
The following is the chemical equation for cellular respiration: C6H12O6 + 6O2 → 6CO2+6H2O + energy
Exothermic
Endothermic
The combustion of fossil fuels releases energy as fire.
Exothermic
Endothermic
The law of conservation of mass says substances can neither be ___________ or ____________.
Blended together; separated
Created; destroyed
Built; torn down
Condensed; extracted
Calcium (Ca) and chlorine (Cl) combine to form calcium chloride (CaCl2), a common salt. In this reaction, calcium and chlorine are the:
Producers
Products
Reactionaries
Reactants
When calcium (Ca) and chlorine (Cl) combine to form calcium chloride (CaCl2), calcium chloride is the:
Originator
Reactant
Product
Producer
The equation pictured shows the reaction of hydrogen (H) with oxygen (O). 4 grams of hydrogen and 32 grams of oxygen will combine to form:
36 grams of water
28 grams of hydroxide
32 grams of oxygen
36 grams of deuterium
In the following chemical reaction, 4 grams of calcium (Ca) must combine with how many grams of chlorine (Cl) to produce 10 grams of CaCl2?
4 grams
6 grams
8 grams
10 grams
A chemical reaction takes place. The mass of the reactants is 25 grams. What does the mass of the products have to be to follow the law of conservation of mass?
20 grams
30 grams
15 grams
25 grams
In a chemical reaction, the mass of the all the reactants was 20 grams. The mass of all the products (including gas) was of 17 grams. Did this reaction follow the law of conservation of mass?
Yes, because a small amount of mass will always be destroyed in reactions.
No, because the products should always have more mass than the reactants.
No, because some of the mass has been destroyed in the reaction.
Yes, because the reactants should always have more mass than the products.
A scientist places potassium into water. The mass of the potassium (K) is 25 grams and the mass of the water (H2O) is 50 grams. The reaction produces potassium hydroxide (KOH) and hydrogen gas (H2). If the reaction produces 5 grams of hydrogen gas, what mass of potassium hydroxide is formed?
75 grams
70 grams
20 grams
45
A student carries out a chemical reaction. The reactants have a mass of 200 grams. When the student measures the mass of the products, their mass is only 175 grams. What is the best explanation for this?
The balance the student used is broken.
The reaction was a nuclear reaction instead of a chemical reaction
The student did not measure the mass of all the reactants
The reaction produced a gas that the student did not measure
You burn 150 grams of wood. The ash that is left behind has a mass of 100 grams. What is the most likely explanation for this?
50 grams of matter was destroyed during the reaction
Some of the wood was changed into gas during the reaction
Many of the atoms in the wood were completely burned up
The heat made the wood less dense.
Which of the following is a compound?
H2
Na
CaCl2
O2
CH4 has how many atoms of hydrogen?
1
5
4
2
What are the reactants in the following chemical equation?
Carbon dioxide and water
Water and oxygen
Carbon dioxide and oxygen
Methane and oxygen
What are the products in the following chemical equation?
Carbon dioxide and water
Water and oxygen
Carbon dioxide and oxygen
Methane and oxygen
The following is the chemical equation for sugar: C6H12O6. How many oxygen (O) atoms does sugar have?
6
12
18
24
The chemical formula for a compound with one atom of nitrogen (N) and three atoms of hydrogen (H) is:
N3H3
3 NH
NH3
NH
How many elements are in C6H12O6?
24
3
6
12
In a chemical reaction, the mass of the products is ____________ the mass of the reactants.
The same as
Greater than
Less than
Not related to
Wood + O2 ———> ashes + CO2 + H2O
The reaction above would take place in a/an
closed system
open system
isolated system
Wood + O2 ———> ashes + CO2 + H2O
The reaction above would be
exothermic
endothermic
isothermic
unothermic
Wood + O2 ———> ashes + CO2 + H2O
The mass of the products, in the above equation, can accurately be calculated.
True
False
In science, an open system is a system that can freely exchange ______ and _______ with its surroundings.
matter, energy
antimatter, dark energy
location, ideas
food, shoes
Which is a not an example of an open system?
energy transfer in an automobile
a terrarium
a forest fire
weather in mississippi
Use a watermelon as an example. The seed and red part make what kind of mixture?
homogeneous
deuterogeneous
unogeneous
heterogeneous
Use a watermelon as an example. The sweet juice of the watermelon would be what kind of mixture?
homogeneous
deuterogeneous
unogeneous
heterogeneous
Use a watermelon as an example. You put salt on your watermelon and notice that it disappears. That tells you that the salt is
a solvent
a solution
a precipitate
a solute
Use a watermelon as an example. The juice of the melon is also called a/an _______ solution
aquarius
aqueous
aquired
equine
Use a watermelon as an example. As you continue to put salt on your watermelon, you notice that it stops “disappearing”. This lets you know that you’ve exceeded the _______ of the juice.
Solidability
Solubility
Saleability
Sailability
When you are making tea, you put sugar in until no more will dissolve. You have made a ______ solution.
unsaturated
polyunsaturated
saturated
polysaturated
The sweeter you make the tea, the higher the ________ of sugar is.
consecration
concentration
condensation
consideration
A solution is prepared by adding 100g of solid sodium hydroxide, NaOH, to 1000mL of water. What is the solid NaOH called?
solution
solute
solvent
mixture
How does the solubility of sugar change as the temperature increases?
increases
doesn't change
decreases
fluctuates randomly
Carbon has an atomic number of 6. What can you conclude about carbon from this fact?
it has six protons
it has six neutrons
it is in group six
it is in period six
Wood is a complex material made of many substances. Which of the following does not occur as a result of a physical change in wood?
it turns to ash
it floats in water
it is broken in pieces
The equation below shows the reaction of hydrogen (H) with oxygen (O). 4 grams of hydrogen and 32 grams of oxygen will combine to form:
2H2 + O2——>2H2O
4g 32g ?
36 grams of water
28 grams of hydroxide
32 grams of oxygen
36 grams of deuterium
Ca + Cl2 ———> CaCl2
Calcium (Ca) and chlorine (Cl) combine to form calcium chloride (CaCl2), a common salt. In this reaction, calcium and chlorine are the:
producers
products
reactionaries
reactants
A chemical reaction takes place. The mass of the reactants is 25 grams. What does the mass of the products have to be to follow the law of conservation of mass?
20 grams
30 grams
15 grams
25 grams
A student carries out a chemical reaction. The reactants have a mass of 200 grams. When the student measures the mass of the products, their mass is only 175 grams. What is the best explanation for this?
The balance the student used is broken
The reaction was a nuclear reaction instead of a chemical reaction
The student did not measure the mass of all the reactants
The reaction produced a gas that the student did not measure
