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Separating Mixtures
Chemical Formulas
Chemical Reactions
Elements
Potpourri
100
What is a mixture?
Two or more materials together
100
What is a compound?
a substance of two or more different kinds of atoms
100
What happens to the atoms in a chemical reaction?
they rearrange
100
What are two properties that metals share?
conduct heat and electricity; shiny surface
100
If two elements are in the same column, what do you expect to be true of the elements.
They have similar properties.They have similar properties.
200
Name three physical properties of materials that you could use to separate a mixture.
Size, shape, magnetism, floating/sinking
200
What is the smallest particles that all matter on Earth is made of?
atoms
200
When citric acid and baking soda are combined with water where do the carbon dioxide bubbles come from?
The atoms rearranged to form the carbon dioxide.
200
What two elements are the most abundant in a human being?
hydrogen and oxygen
200
In what order are the elements when reading the periodic table from left to right?
atomic number
300
What is a solution?
When a solid dissolves into a a liquid.
300
What happens to water molecules when you heat them?
form water vapor
300
After a chemical reaction can you separate the products into the original reactants? Why or why not?
No, because the atoms have rearranged to form new substances.
300
What is the earth's core mostly made of?
iron
300
Is salad dressing a mixture, solution, or compound?
mixture
400
How can you separate a solution?
Evaporation
400
At room temperature oxygen can change both shape and volume. What classification is oxygen?
Gas
400
What is evidence that a chemical reaction has occurred?
New product formed, heat, change in color.
400
If there are only 90 elements that occur naturally, how are so many different molecules?
The atoms rearrange and form the different molecules.
400
What type of instrument would you use to see how molecules rearrange?
microscope
500
What tool would you use to separate sugar from water?
evaporation dish
500
How many atoms are in the chemical formula 3HCl
6
500
What is the name of the solid formed in a chemical reaction?
Precipitate
500
What are the three most common elements in living organisms?
hydrogen, carbon, oxygen
500
What type of compound is sodium chloride, magnesium chloride, and potassium chloride?
salts