How do you know that K, an alkali metal is very reactive? a. It conducts heat
b. It conducts electricity
C. It is a soft and shiny metal
d. It contains one valence electron

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

When a scientific theory has been tested and proved by the scientific community, it becomes a law