Chemical and physical changes
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Metals, Nonmetals, and Metalloids
Relative Density
Random
100
Is cutting a paper a physical or a chemical change?
It's a physical change.
100
This property of metals makes them useful in electrical wiring, cooking utensils, and in electronics.
What is being a good conductor?
100
These are two properties of metals.
Answers may vary. Possible choices: good conductors, malleable, ductile, high density, high melting point, shiny luster/lustreous, or sonorous.
100
True or false:
The formulas of the reactants appear after the arrow.
False: The formulas of the reactants appear before the arrow.
100
An apple rotting is an example of this type of change.
What is a chemical change?
200
Is melting water a physical or a chemical change?
It's a physical change.
200
According to relative density, when an object is LESS dense, it will __________.
What is sink?
200
This property of nonmetals means they break easily.
What is brittle?
200
What do we use to separate the formula of one reactant from the formula of other reactant?
The formulas are separated with a plus sign.
200
True or False. Water is less dense than Hexane but is more dense than Glycerin.
What is false?
300
Is mixing vinegar and baking soda a physical or a chemical change?
It's a chemical change
300
According to the periodic table, this rare earth metal has the atomic number of 21.
What is Scandium?
300
The properties of being a semi-conductor and shiny would belong to this classification of matter.
What is a metalloid?
300
If an unknown solid object with a density of 0.85 g/ml is placed in water, this object should _____________.
What is float?
300
Name two metalloids from the periodic table.
Answers could be-
What are boron, silicon, germanium, arsenic, antimony, tellurium, polonium?
400
Is mixing salt and water a physical or a chemical change?
It's a physical change
400
These are the three ways that energy can change.
What are light, sound, and heat?
400
This setup is used to test this property.
What is conductivity?
400
According to the column, these are the TWO substances MORE dense than corn syrup.
What are the honey and the bolt?
400
Fill-in the blanks: Metals tend to have similar properties. They are __________, or easily drawn or pulled into wires. They are ______________, can be hammered into thin sheets. Nonmetals tend to be more ________, they break easily.
What are ductile, malleable, and brittle?
Must be in order.
500
What is the main difference between a physical and a chemical change?
Physical changes do not produce new substances while chemical changes produce new substances.
500
Name the evidence of a chemical change. (there's 5 things we look for)
1. Precipitate 2. Energy Change. 3. Color Change. 4. Smell change. 5. Bubbles, fizzes, foams.
500
Why are new substances formed in a chemical reaction?
Because the atoms which form the reactants reorder and join in a different way.
500
According to the column, a popcorn kernel has density between that of _______ and _________.
What is 100% maple syrup and corn syrup?
500
Give two examples of chemical changes and two examples of physical changes.
Answers vary.
Chemical - burning, spoiling, rotting, rusting, tarnishing.
Physical - melting, freezing, tearing/cutting, boiling.