What is anything that has mass and takes up space?
The study of matter and how it changes is called?
What is a physical property?
a characteristic of a substance that can be observed without changing the substance into another substance
What is an example of a physical property?
Color, hardness, texture, change of state
A change in matter that produces new substances is called a?
What is an example of a chemical property?
The substances that undergo change in a chemical reaction are called what?
The new substances formed in a chemical reaction are called what?
What is evidence that a chemical reaction is has occurred?
precipitate, color change, bubbles, texture, temperature
In an endothermic reaction, energy is?
In an exothermic reactions, energy is?
What is a chemical formula?
an easy way to show a chemical reaction using symbols instead of words
What does the conservation of matter state?
In chemical reaction, matter is neither created nor destroyed.
The number in front of a chemical formula that tells how many molecules or atoms of each reactant take part in a reaction is called a?
In what kind of system is matter not allowed to enter or leave?
What kind of chemical reaction occurs when compounds break down into simpler products?
What kind of chemical reaction occurs when one element replaces another in a compound, or when two elements in different compounds trade places?
What kind of chemical reaction involves two or more elements combining to make a more complex substance?
What is activation energy?
the minimum amount of energy needed to start a chemical reaction
In an exothermic reaction, the products
have less energy than the reactants
In an endothermic reactant, the products
have more energy than the reactants
What factors affect the rates of chemical reactions?
temperature, surface area, concentration, catalysts, inhibitors
What is an inhibitor?
a material used to decrease the rate of reaction
A material that increases the rate of the reaction is called a?
What prevents reactants from coming together?
What are the three things necessary to start and maintain a fire?
fuel, oxygen, heat
What is combustion?
a rapid reaction between oxygen and fuel
What provides activation energy to start a fire?