Elements
What element is first on the periodic table?
Hydrogen
Change of state is an example of a ____________ change
Physical
Is a piece of clay molded into a teddy bear a physical or chemical change?
Physical
Atoms in a molecule are _________________ joined
Chemically
In a chemical equation what do you call the elements / molecules on the left hand side?
Reactants
What is the symbol for Potassium?
K
Process of a solid changing to a liquid is _______________
Melting
Evaporation is a substance changing from a ___________ to a _________?
Liquid to a Gas
How many atoms in the following H2SO4
7
In a chemical equation what do you call the elements / molecules on the right hand side?
Products
How many elements in the following NaCl
2 - Na - sodium, Cl - chlorine
Water droplets forming on the outside of a cold bottle is an example of ______________
Condensation
The rusting of iron is an example of a ___________ change
Chemical
What is the name of the compound below?
CaCl2
Calcium Chloride
A combination of different substances that are not chemically joined, is a ______________
Mixture
What element has a symbol of Mg?
Magnesium
The process of water changing to a gas is called ______________
Evaporation
Why is the burning of paper and the scrunching of paper 2 different types of changes
Burning paper - new substance is formed,
Scrunching paper - no new substance formed
The name of a compound which is made up of a chain of atoms in a repeating pattern
Polymer
The variable you change during an experiment/investigation.
Independent variable
Which of the below would be an example of an element?
Carbon dioxide, Salt, Water, Silver
Silver
The name of the temperature where a substance changes from a liquid to a gas.
Boiling point
Signs that a chemical reaction has taken place
True or False:
There are more elements in the world than there are molecules
False
The variable you measure during an experiment/investigation.
Dependent variable