Chemistry Basics
What are the three primary states of matter?
Solids
Liquids
Gases
What do you call a combination of substances where each keeps its own properties and can be separated physically?
A mixture
How many oxygen atoms are in CO2?
There are 2 oxygen atoms
What is the difference between a physical change and a chemical change?
A physical change does not create a new substance; a chemical change does.
What type of material comes from plants, animals, or minerals found in nature?
Natural materials
What is the smallest unit of matter?
Atoms
What are the two types of Mixtures?
Heterogeneous and Homogeneous mixtures
How many molecules of the following compound are in the in 6H3C2ON5?
6 molecules
Which of the following is not an example of a chemical change?
a. Sugar dissolving in water
b. A slice of bread molding
c. Metal tarnishing
a. Sugar dissolving in water
What do we call materials that are made by humans using chemical processes?
Synthetic materials
What is it called when atoms of different elements join together?
What kind of mixture is a salad or trail mix?
a heterogeneous mixture
How many atoms are there of each element in the following formula; 4CF2Cl2
C=4, F=8, Cl=8
When you eat, stomach acid digests the food and breaks it down so your body can absorb important nutrients. This is an example of what type of change in matter?
Chemical change
How are synthetic resources typically created?
Through human manufacturing or chemical processes, using natural resources.
What is the process that forms new substances called?
Chemical Reactions
What is the best way to describe the composition of a heterogeneous mixture?
The components are not evenly mixed and can be easily separated.
What is the numbers found on the lower right-hand side of an element symbol called and what does it tell us?
The Subscript; it tells us how many atoms there are for that atom.
What do you call a reaction that absorbs energy from its surroundings? (hint* it will feel colder)
An endothermic reaction
What are the advantages of many synthetic materials over natural materials?
They are more durable, more sustainable, less expensive, and are an alternative to natural resources.
What law states that matter cannot be created or destroyed in a chemical reaction?
The Law of Conservation of Mass
Two substances physically combined and that appears the same throughout is classified as what kind of mixture?
In the equation 2Mg + O2 → 2MgO2 , how many magnesium(Mg) atoms are on the product side?
2 Mg atoms on the product side.
What evidence of chemical change occurs when bubbles appear without boiling?
The production of gas bubbles.
What are some environmental concern related to synthetic materials?
Pollution