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Tarloff -- Quarter 2 exam review
Terms in this set (36)
What happens in a chemical reaction
atoms break apart in the reactants and rearrange into new substances in the products.
Chemical reactions that NEED energy in order to occur. (energy in the reactants)
Chemical reactions that have too much energy and release it as a result of the reaction (energy in the products)
Law of Mass Conservation
Matter is never created or destroyed it just changes form. Which means what atoms you have in the reactants you MUST also have in the products and vice versa.
According to the law of mass conservation, what happens when sugar dissolves in water?
The total mass remains the same. The sugar is only dissolves (physical change) in the water so the mass is a total of both of them.
Sugar water is an example of a
homogeneous mixture with a solute dissolved into a solvent.
Balance: B + O2 --> B2O3
4B + 3O2 --> 2(B2O3)
Balance: C2H6 + O2 --> CO2 + H2O
1C2H6 + 1O2 --> 2CO2 + 1H2O
What is the correct chemical equation for the following: Magnesium metal reacts with Aluminum oxide in a single replacement reaction.
3Mg + 1Al2O3 --> 2Al + 3MgO
Anything that has mass and takes up space.
If something is matter it is either
a pure substance or a mixture
Pure substances are
either elements or compounds, always have definite chemical and physical properties (can write a chemical formula for them).
either homogeneous or heterogeneous
only made up of 1 type of atom.
made up of 2 or more different types of atoms
composed of a solute dissolved into a solvent. Does not display the Tyndall effect, looks the same throughout
looks noticeably different, does display the Tyndall effect, particles settle out.
the relationship between mass and volume
a measure of the amount of matter ("stuff") in an object. (g)
the amount of space an object takes up (mL)
According to the law of mass conservation, if there are 200 grams of a reactant, how many total grams of product should you have?
Signs of a chemical reaction
color change, formation of a precipitate, production of a gas, odor, formation of a new substance.
a property of matter (either chemical or physical) that is used to help identify what exactly a substance is.
a characteristic of a substance that does not change what the substance is.
changes the identity of a substance on a molecular level
Which of the following is NOT air, light, steam, atoms
Which of the following IS a compound: Cobalt (Co), sodium (Na), CO2, Fluorine (F)
CO2, carbon dioxide
Which of the following is a mixture: Salt (NaCl), Sand, Water, Iron
definite shape and definite volume
Definite volume, changing shape
No definite shape or volume
Indicator of chemical change
color change, formation of a precipitate, combustion, production of a gas, different arrangement of atoms in the reactants and products.
Indicator of a physical change
phase change, dissolving, same atoms going in as you have coming out.
What happens to the density of an object when you cut it in half?
Nothing, it's density will not change.
helps identify what a substance is: density, melting point, boiling point
When energy is added to water what 2 things can happen?
Temperature change or phase change
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