Atoms
what are the three main parts of an atom
Proton, neutron, electron
What is the equation for density?
Mass/ Volume
What is solubility?
Burning is a chemical change. True or false
True
Is melting or boiling a physical change? Yes or no.
Yes because there is a change in state but no new material is formed.
What charge does a proton have?
Positive
Density measures an object's _________.
compactness
Two or more substances that are not chemically combined
Define a chemical reaction.
A chemical reaction is a process in which one or more substances(reactants) are converted to one or more different substances(products).
Define a physical change.
Physical reactions may include changes in texture, shape, temperature, and state, without a change in the composition. No new substances are produced.
What charge does a neutron have?
Neutral
Mass is a measure of the _______ an object.
amount of matter
In salt water what is the solvent?
Water
In the chemical equation what is being produced:
2H2 + O2 --> 2H2O
Water
Is dissolving sugar in water a chemical or physical change?
Physical change. No new substances are formed, there are mixed together to create a mixture.
What determines what kind of element any given atom is?
Which term refers to the amount of physical space an object takes up?
volume
In salt water what is the solute?
salt
In the chemical equation for table salt:
2Na + Cl2 --> 2NaCl
What is/are the reactant(s)?
2Na + Cl2
What are some different physical properties of water in it's three different states: solid, liquid and gas.
Solid(ice)- closely packed atoms, fixed shape, higher density
liquid- atoms are less closely packed, no fixed shape
gas- invisible, atoms are far apart, no fixed shape
8 electrons
An object submerged into 50 cm^3 of water raises the water level to 65 cm^3. The mass of the object is 30 g. What is its density?
2 g/ cm^3
Is dissolving a solid into water is a physical or a chemical change.
Physical
In the chemical equation for table salt:
2Na + Cl2 --> 2NaCl
What is/are the product(s)?
2NaCl
Is the ability to react with with acids or bases (pH) a physical or chemical change?
chemical