Chemical/Physical Change
One example of a physical change is?
A. Burning Aaper
B. Baking cookies
C. Caramelizing table sugar
D. Dissolving salt in water
D. Dissolving salt in water
What is the name for the horizontal row on the periodic table?
A. Family
B. Period
C. Group
D. Element
B. Period
Which group of non-metals is the most reactive?
A. Group 1
B. Group 2
C. Group 17
D. Group 18
C. Group 17
The law of conservation of matter states that?
A. matter cannot be created or destroyed
B. matter can be created but not destroyed
C. matter cannot be created but can be destroyed
D. Matter can be created and destroyed
A. matter cannot be created or destroyed
Which parts of the atom move around the nucleus?
A. Atomic mass units
B. Electrons
C. Protons
D. Neutrons
B. Electrons
If you heat a liquid and measure the temperature at which it boils, you are measuring?
A. Atomic property
B. Physical property
C. Chemical property
D. Molecular property
B. Physical property
In an atom, the number of protons equals the number of
A. Nuclei
B. Electrons
C. Neutrons
D. Isotope
B. Electrons
If a scientist needs to fill a container with a gas that would not react, which element should he choose?
A. Copper
B. Nitrogen
C. Helium
D. Mercury
C. Helium
In an activity, 20 grams of salt are dissolved in 70 grams of pure water. The water is then heated on a hot plate. When the water evaporates completely, how much salt will be left?
A. 0 grams
B. 18 grams
C. 20 grams
D. 22 grams
C. 20 grams
Which property of aluminum makes it a suitable metal for soda cans?
A. It has good electrical conductivity
B. It is very malleable
C. It is very ductile
D. It can reflect light
B. It is very malleable
One example of a chemical change is?
A. Filtering
B. Burning wood
C. Boiling water
D. Crushing a can
B. Burning wood
How many protons are in an atom of phosphorus?
17
Lemonade consists of several substances that are NOT chemically combined, so lemonade is classified as?
A. Element
B. Compound
C. Mixture
D. Pure substance
C. Mixture
What must be true for an equation to be properly balanced?
A. The volume of both sides of the equation must be equal
B. The mass of both sides of the equation must be equal
C. The total number of digits on both sides of the equation must be equal
D. The total number of atoms of each element on both sides of the equation must be equal
D. The total number of atoms of each element on both sides of the equation must be equal
The atomic number of an element is based on the
A. Mass of its nucleus
B. Number of electrons around its core
C. Number of protons in its nucleus
D. Number of neutrons in tis nucleus
C. Number of protons in its nucleus
Compounds and Elements are classified as?
A. Homogeneous Mixtures
B. Heterogeneous Mixtures
C. Pure Substances
D. Solutions
C. Pure Substances
Why are alkali metals unsuitable for constructing a building?
A. They are too reactive
B. They have too high a density
C. They have too high a melting point
D. They are too rare
A. They are too reactive
How many neutrons are in an atom of Sodium?
A. 24
B. 16
C. 12
D. 11
C. 12
When the following equation is balanced, what is the mass that would fill in the blank in the front of N2? ____ N2 + 30g H2 = 50 g NH3
20g
Which observation would support the conclusion that a chemical reaction took place?
A. A liquid evaporates
B. A precipitate is formed
C. A substance is dissolved in liquid
D. Solid ice melts
B. A precipitate is formed
Identify the chemical change words.
Rust, Dissolve, Burn, Bake, Freeze, Melt
A. Rust, Dissolve, Burn
B. Rust, Burn, Bake
C. Dissolve, Freeze, Melt
D. Burn, Bake, Melt
B. Rust, Burn, Bake
How many valence Electrons does Sulfur have?
A. 6
B. 7
C. 16
D. 3
A. 6
Which element is a semi-conductor
A. Oxygen
B. Phosphorus
C. Silicon
D. Sodium
C. Silicon
Which of the following is a balanced chemical equation?
A. 4Al + 3O2 = 2AlO3
B. 4Al + 2O2 = 2Al2O3
C. 4Al + 3O2 = 2Al2O3
D. 2Al + 2O2 = 3Al2O3
C. 4Al + 3O2 = 2Al2O3
Which element has similar properties to Nitrogen?
A. Carbon
B. Sulfur
C. Nickle
D. Phosphours
D. Phosphours