Chemical Reactions Flashcards
In a chemical reaction the atoms or ions of one more substance, called ________, are rearranged, resulting in one or more different substances, called the _________
for example iron, water, and oxygen react to form hydrated iron oxide or rust.
reactants; products
Matter is neither created or destroyed during a chemical reaction, so the mass of the products always _____ the mass of the reactant
equals, is the same
this is known as the law of conservation of mass.
Chemical reactions can be represented by chemical equations Chemical equations show the reactants on the ____side and the products on the ____ side.
left; right
because of the law of conservation of mass, a chemical equation must
be balanced
the total number of atoms of an element on the left side must equal to the total number of atoms of the element on the ______
Right side
2H2 + O2 → 2H2O, restated in words to explain how the reactants balance each other and are equal to the product
Restated in words: two molecules of hydrogen (H2 ) combine with one molecule of oxygen (O2 ) to form two molecules of water (H2O
H₂O; which number or letter is the subscript and how do you know what the subscript is?
The subscript is the ₂; you will know which the subscript is by seeing the smaller font, on the bottom
2H₂O; What is the coefficient ?
The large 2
To balance a chemical equation, you can change the______—the number of units of any reactant or product. However, you cannot change the subscripts of any reactant or product.
Coefficient;
Energy is involved in all chemical reactions. A reaction in which the reactants absorb energy from their surroundings is an _____reaction.
endothermic
when you scramble an egg, you add heat energy and the egg solidifies. What type of chemical reaction is this?
Endothermic
A reaction in which energy is given off with the products, usually in the form of heat or light, is an ________ reaction. When you burn wood in a fireplace, for example, heat and light energy are given off.
exothermic
______energy is the amount of energy needed to get a reaction going
Activation
Two basic types of Enegry
Potential and kinetic
An object will have _____ energy because of its position
Potential
An object will have _____ energy because it moves
Kinetic
When you raise a hammer it has what type of energy(at its peak height)
Potential
When you swing the hammer it has what type of energy
Kinetic
Once the hammer hits the nail, it ______ energy to the new
Transfers
The energy transferred to the nail is equal to the power that the hammer was swung; the unit of measurement that we use to determine the amount of energy that was transferred is called
Joules
The rate of doing work or consuming energy is called power; this can be measured in the unit
Horse power
An ion is what in relation to an atom
It is an electrically charged at once the Adam loses or gains a charge
Physicist Albert Einstein discovered the relationship between energy and mass and expressed it in the equation E = mc 2
E = mc 2 ; what does E, represent
Enegry
E = mc 2 ; what does M and C represent
Mass and the speed of light
