Chemical Equations
A chemical equations shows the substances involved in the reaction. The substances are represented by their....
Chemical Formula
N2 + H2 -> NH3
1:3:2
H2+O2->H2O
Synthesis
Chocolate added to milk changes brown.
Physical
On the 5th day of Christmas my true love gave to me, 5 "Au" rings....
Gold
The substances on the right side of a chemical equation are called....
Products
Matter can not be created nor destroyed
Law of Conservation of Mass
2KI + Pb(NO3)2 -> PbI2 + 2KNO3
Replacement
Steel wool in salt water change the water to a orangish brown color.
Chemical
When you cook Christmas cookies in the oven they start to turn a light brown as they cook.. What type of change is occuring? How do you know?
Chemical-color change
The number to the right of the element tells us the number of atoms of that element in the chemical formula. This number is called a....
Subscript
We can not do a balance of matter around a tree because it is in an....
open system
When heat is added mercury oxide breaks down to form mercury and oxygen gas...
Decomposition
You mix two substances together in a glass tube. You immediately see frost forming on the outside of the tube. This is an example of a
Chemical Change
Cocoa dissolves faster in hot water than in cold water. Why is this?
Particles move faster when the temperature increases allowing substance to dissolve at a higher rate.
The arrow in a chemical reaction can be read as...
Yields
You are doing a chemical experiment with baking soda and vinegar in a beaker with a balloon around the top of the beaker. You weight the substances before the reaction and after. You find that you have 3 g of baking soda and 10 g of vinegar that you are putting in the beaker. You weigh the beaker after wards and it has 11.5 g of liquid mixture in the beaker. How much CO2 was produced?
1.5 g
2Fe + 3O2 -> 2FeO3
Use the equation to describe the formation of rust...
The products of a chemical reaction have more energy than that of the reactants. This is an example of a
Endothermic Reaction
Hand warmers make great stocking stuffers! What type of reaction makes these warm little pouches work?
Exothermic
A substance in a chemical equation that is unchanged on both sides of the equation is used to speed up the rate of a reaction or get the reaction started is called a....
Catalyst
A sealed system in the laboratory is also known as a....
Closed system
Water electrolysis splits water into hydrogen gas and oxygen gas.
Decomposition
Five phenomena that can be used as evidence of a chemical reaction are...
Temperature change, color change, gas formation (fizzing, bubbles), a new substance formed, formation of a precipitate.
The Christmas star is made up of two elements. Both start with the same letter. One is a noble gas. What are the two elements?
Hydrogen and Helium