True or False: The Law of Conservation of matter is only true for experiments performed in closed systems.
False, it is true for all physical and chemical changes
100
True or False: The freezing point of water is the same as the melting point of water.
True. Both changes happen at 0 degrees Celsius.
100
True or False: The horizontal rows in the periodic table are known as groups.
False, they are called periods
100
How many electrons fit in the first energy level? How many fit in the second energy level?
2 electrons in the first, 8 electrons in the second
100
A chemical reaction in which the total making and breaking of bonds results in a net release of energy is called what?
An Exothermic Reaction
200
What does it mean if a substance is ductile?
It can be stretched or pulled into a long, thin wire
200
Which of the following is NOT an example of a chemical change?
(a)gas burning on a stove
(b)rust forming on an iron fence
(c)salt dissolving in a glass of water
(d)using electricity to break down water into hydrogen and oxygen
(c)salt dissolving in a glass of water
200
What is the Chemical Symbol of Iron?
Fe
200
When an atom loses an electron, what type of ion does it become?
A positive ion
200
What 2 products does a neutralization reaction produce?
Water and a Salt
300
Will a liquid with a high viscosity flow faster or slower than a liquid with low viscosity?
Higher viscosity = slower flow rate
300
An uncovered pot of soup is simmering on a stove, and there are water droplets on the wall above the back of the stove. What two phase changes have happened?
Vaporization, then Condensation.
300
What is the most abundant type of element on the periodic table?
Metals
300
How many oxygen atoms are there in- 4 Al2(SO4)3 ?
48 Oxygen Atoms
300
Copper reacts with oxygen to form copper oxide. What can you infer about the properties of copper oxide?
They will be different than both the properties of Copper and the properties of Oxygen.
400
According to Charles' law, when the temperature of a gas decreases at constant pressure, what happens to its volume?
The volume decreases as well
400
Which of the following is not a physical property?
(a)flexibility
(b)ability to catch fire
(c)melting point
(d)ability to conduct electricity
(b)ability to catch fire
400
Helium, Neon, Argon, and Krypton belong to a group called...
The Noble Gases
400
Draw and electron dot diagram and an electron configuration diagram for Carbon. Label which is which.
See pictures
400
What do we call a chemical bond in which two atoms share electrons?
A Covalent bond
500
A block of aluminum has a density of 2.7 g/mL. What happens to its density if half of the sample is removed?
The density stays the same
500
When water is heated to 100 C, what will happen?
The liquid water begins to vaporize, forming a gas. The temperature of the water will stay the same until all of the liquid has vaporized.
500
For an atom of Sodium: What is its Chemical Symbol?How many protons, neutrons, and electrons does it have? What is its mass number?
Chemical Symbol = Na. 11 Protons, 11 electrons, 12 neutrons. Mass Number = 23.
500
Draw two isomers of Pentane (C5H12)
Various answers
500
You have a chemical reaction occurring in a test tube and you observe bubbles being produced. In order to identify the gas, you put a glowing splint into the test and it goes out. What type of gas was produced?