States of Matter
This state of matter has a definite shape and volume.
What is a solid
If the melting point of gold is 1,793 and you have something that looks like gold but melts at 2,000 degrees, is it gold? Explain why or why not.
It is definitely NOT gold. Only gold melts at 1,793. Not higher or lower. Melting point is how you can tell a substance since it is only unique to that substance.
Matter cannot be ________________ or _________________, only rearranged.
created, destroyed
In this reaction, a solid becomes a liquid when heat energy is added. (Chemical or Physical)
What is a physical reaction.
The chemical symbol for H.
What is Hydrogen.
This state of matter has no shape or volume.
What is a gas
What is density?
Density is how closely packed molecules are, how crowded and heavy.
Reactants are the chemicals you start with in a chemical reaction.
In this reaction, a substance changes color and a burning smell is released. (Chem or Phys)
What is a chemical reaction.
The number of protons and also the number of electrons.
What is the atomic number?
This is the phase change that occurs when a liquid becomes a solid.
What is freezing
What is melting point?
The temperature at which a chemical goes from solid to liquid due to increased heat.
What are products in a chemical reaction?
Products are the NEW chemicals you end with in a chemical reaction.
In this reaction, there is a temperature decrease and a gas is produced. (Chem or Phys)
What is a chemical reaction.
What is a compound?
Two or more elements bonded together to make a chemical.
This is the state of matter in which molecules are the most dense.
What is a solid.
salt molecules and water molecules in the same space is an example of....
a mixture
Mass of the products is ______________ to the mass of the reactants.
Equal
List at least 3 indicators of a chemical change.
What are color change, gas is produced, smell is produced, the reaction is irreversible, temperature change (without cooling or heating,).
What is an element?
A kind of atom from the Periodic Table, like Hydrogen or Carbon.
List the 3 states of matter in order from the lowest to the highest energy level.
What is solid, liquid, gas, (and plasma)
Two or more atoms chemically combined.
What is a compound?
How can you tell if the mass of the products is equal to the mass of the reactants?
Count the atoms on each side and see if they are the same amount.
In a chemical reaction, CaOH (calcium hydroxide) and CO2 (carbon dioxide) are _________, CaCO4 (chalk) and H20 (water) are __________. (choices are: products, reactants)
What are reactants and products
True or False: Compounds can act differently than their individual elements when combined or not combined. Provide an example.
True. For example, Na is dangerous alone. Cl (chlorine) is danger alone. Together they are salt which is not dangerous.