Properties and Changes
Atoms and Molecules
Chemical Reactions
Phase Change
Random
100
What physical property describes a substance that can dissolve?
Solubility
100
What is the smallest unit of matter?
An Atom
100
Where are the products found in a chemical equation?
the end.
The arrow points to.
The substance produced.
100
What is a solid turning to a liquid?
Melting
100
Physical property that describes the ability to be shaped.
Malleability
200
What is the physical property that describes how shiny a substance is?
Luster
200
What is two atoms bonded together?
Molecule
200
What happens to atoms in a chemical reaction?
They switch partners or rearrange.
No new matter is created or destroyed.
200
What is a solid going to a gas?
sublimation
200
What is incorrect about this model of an atom?
You cannot pinpoint exactly where to find an electron. They move too fast all around the nucleus.
300
What describes a substances ability or inability to change?
Chemical property
300
What is a pure substance made of just one type of atom?
Element
300
What are the reactants in a chemical reaction?
the things you start with
300
What happens to the density of a substance when heat is added.
particles spread apart and become less dense.
300
How does increasing the temperature affect the rate of a chemical reaction?
Particles will move faster increasing the speed at which they will react.
400
Physical or chemical change? Water going through deposition and turning to frost.
Physical
Phase change, still H2O
400
What is more than 2 atoms bonding together?
Compound
400
How many atoms of each type are on each side of the equation?
H=4 and O=2
H=4 and O=2
400
Why is a phase change considered a physical change?
No new substance is created.
400
What is the law of conservation of mass?
Matter is not created or destroyed.
500
What are 4 pieces of evidence a chemical change happens
odor
Color
temperature
precipitate
gas produced
light
sound
500
Argon is an element with the atomic number of 18 and an atom mass of 39.9. What is the correct number of protons, neutrons, and electrons?
Protons-18
Electrons-18
Neutrons- 22
500
What are three ways to change the rate of a chemical reaction?
Surface area
Catalyst
Temperature
Concentration
500
What happens to the speed of the particles when heat is removed?
they slow down.
500
Something that is added to a chemical reaction, that is not part of the final product, that speeds up or slows down the rate of a chemical reaction.
Catalyst