Atoms
True or false? Matter is conserved.
True
True or false? Elements are made up of only one type of atom.
True
A compound is when ___ or ________ atoms of different elements combine.
2 or more
Based on the data below, what is the most abundant element in the Earth's crust?
Oxygen - 47%
Silicon - 28%
Aluminum - 8%
Iron - 5%
Oxygen at 47%
What tool is used to measure temperature?
thermometer!
True or false? Atoms are the basic building blocks of matter.
True!
An element can be represented by a(n) _____________ ______________.
element/chemical symbol
A compound can be represented by a:
chemical formula
What is the most abundant element in the ocean?
Chlorine: 55%
Sodium: 30%
Sulfate: 8%
Chlorine at 55%
Which conclusion is best for this experiment? A student tested how the temperature of water affects how quickly sugar dissolves. The student recorded the time it took for a sugar cube to dissolve in cold water (5 minutes), room temperature water (3 minutes), and warm water (1 minute).
a) Sugar dissolves slower in warm water
b) Sugar dissolves faster in warm water
c) Temperature has no affect on how fast sugar dissolves
d) sugar dissolves the same for all water temperatures
b) Sugar dissolves faster in warm water
Match the subatomic particle to the charge. Positive, negative, neutral
Proton:
Neutron:
Electron:
Proton: positive
Neutron: neutral
Electron: negative
Elements differ by their number of ___________. (protons, neutrons, or electrons).
protons
Chemical bonds are the forces that hold atoms together to form new substances. These bonds are formed with _______________ (protons, neutrons, electrons).
electrons
What is the most abundant element in the atmosphere?
Nitrogen: 78%
Oxygen: 21%
Other: 1%
Nitrogen at 78%
Based on the data below, who did the most pushups in gym?
Oliver - 36
Max - 93
Jordan - 30
Alyssa - 28
Max at 93!
The nucleus includes which two subatomic particles?
protons and neutrons
What is the chemical symbol for Nitrogen? Use the periodic table!
N
What elements make up the compound CO₂?
Carbon and Oxygen
What is the most abundant element in living things?
Oxygen: 65%
Carbon: 19%
Hydrogen: 10%
Nitrogen: 3%
Oxygen at 65%
In a neutral atom, the number of ________ and _______ are equal, while the number of _________ may vary.
In a neutral atom, the number of PROTONS and ELECTRONS are equal, while the number of NEUTRONS may vary.
8
In a chemical reaction, __________ are regrouped into different molecules and the new _________ is created.
What is the least abundant element in living things?
Oxygen: 65%
Carbon: 19%
Hydrogen: 10%
Nitrogen: 3%
Nitrogen at 3%
Identify the independent, dependent, and a constant variable from the experiment!
A student wants to find out how the amount of sunlight affects the growth of a plant. They place one plant in full sunlight, one in partial sunlight, and one in the shade. All plants receive the same amount of water and soil. Each week, the plant growth (height) is measured.
Independent: amount of sunlight
Dependent: growth of a plant
Constant: amount of water, amount of soil