The Atom
Elements and Compounds
Mixtures
Chemical and Physical Properties and Changes
States of Matter
100
What are the three main parts of the atom?
Protons, electrons, and neutrons
100
Give an example of an element.
Hydrogen, Oxygen, Carbon, Iron, Helium, Gold, etc.
100
What is the difference between homogeneous mixtures and heterogeneous mixtures?
Homogeneous mixtures are mixed evenly. You cannot see a separation between different particles/solutions. Heterogeneous mixtures are not mixed evenly. You can see the separation between different particles/solutions.
100
Give an example of a physical property and a physical change.
Physical property - color, state Physical change - adding food coloring to water, freezing water
100
List the three states of matter.
Solid, liquid, and gas
200
What is the charge of the protons?
Positive
200
List an example of a compound.
Water (H2O), Salt (NaCl), Carbon Monoxide (CO), etc.
200
Give an example of a homogeneous mixture and a heterogeneous mixture.
Homogeneous mixture - Cheerios, Water Heterogeneous mixture - Lucky Charms, Oil and Water
200
What does 'change of state' mean?
Changing something from a solid to a liquid to a gas.
200
What is the process called when a liquid turns into a solid?
Freezing
300
What two particles are located in the center of the atom?
Protons and Neutrons
300
How do you distinguish between the symbol for an element and a compound?
An element is represented as one capital letter or a capital letter and a lowercase letter. A compound is represented as more than one capital letter.
300
Are mixtures physically or chemically combined?
Physically
300
Is color a physical property or a chemical property?
Physical property
300
What is the process called when a gas turns into a liquid?
Condensation
400
What particles are circling the center of the atom?
Electrons
400
Are compounds physically or chemically combined?
Chemically
400
True or False: You can separate mixtures by physical processes.
True
400
List two chemical properties and two chemical changes.
Chemical properties: flammability and reactivity Chemical changes: lighting a piece of paper on fire, carbon dioxide gas forming after a reaction.
400
Explain the difference between sublimation and deposition.
Sublimation is going from a solid to a gas. Deposition is going from a gas to a solid.
500
What is the center of the atom called?
The nucleus
500
Put these in order from largest to smallest: atoms, compounds, elements
Compounds, elements, atoms
500
Why is the ocean a heterogeneous mixture, and Salt (NaCl) + Water (H2O) a homogeneous mixture?
The ocean has other particles in it besides just salt and water. It has seaweed, fish, sand, etc. It is not mixed evenly. NaCl + H2O is solely salt and water. There are not any other particles in the mixture. It is mixed evenly.
500
Explain why melting point is a physical property.
The melting point is a degree (temperature) when something changes from a solid to a liquid. This is changing state, which is a physical change.
500
You have a pot of water on the stove and it is heated to the boiling point. What is this process called?
Evaporation
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