States of Matter
What are the three states of matter we have discussed?
Solid, liquid, and gas
What is density a measure of?
How much mass there is in a certain volume.
What type of change can be reversed?
Physical Change
In a reaction, what law is violated by having 1 Hydrogen in the reactants in an equation and 3 Hydrogen in the products?
The Law of Conservation of Mass
If a chemical reaction produces a gas in a closed system, will the mass change?
No, it will stay the same.
What is the term for the temperature where a liquid transforms into a gas?
Boiling Point.
What is the equation used to calculate density?
Density=Mass/Volume
Dissolving salt in water is what type of reaction?
What is the chemical formula for water?
H2O
Why did the mass of the bath bomb in an open system decrease in mass?
Some mass escaped as gas.
Describe how you would draw a gas model.
Atoms are spread out far apart from each other and moving rapidly.
What is the density of an object that has a mass of 15 grams and 5 cm3?
3g/cm3.
Fill in the blank: Chemical changes create new _______.
How many total atoms are in the molecule C8H16?
24 (8 Carbon+16 Hydrogen)
Is it possible to create new matter?
No it is impossible to create something out of nothing.
In the bath bomb, what two solids were necessary for gas production?
Citric acid and baking soda
What state of matter is the least dense?
Gas.
What are three signs that a chemical reaction has taken place.
Gas production
Change in color
Emission of light or sound
Change in smell
Change in temperature
What is the left side of the equation called? And the right?
Left side: Reactants
Right side: Products
Will the mass of the reactants and all products be the same or change?
It will be the same.
Order the states of matter from least dense to most dense.
Gas, liquid, and solid
Why does an object with a density less than water float?
The object displaces a volume of water greater than its own causing it to float.
What is the gas produced by the reaction of a bath bomb and water?
Carbon Dioxide.
Balance the following equation: __N2+__H2=__NH3
1N2+3H2=2NH3
Explain the Law of Conservation of Mass.
Matter cannot be created or destroyed, it can only change state.