This or That
Chemical or Physical Change:
the composition of the substance does not change
Physical Change
Intensive Property
Properties that depend on the type of matter. These do NOT change.
The chemical formula for water
H2O
Mass
The amount of matter in a substance.
What are the 3 general reasons to study chemistry?
1) to explain the natural world
2) to prepare people for careers
3) to produce informed citizens
Mixtures or Substances:
Can be separated chemically
Substances
A quality or condition of a substance that can be observed or measured without changing the substance’s composition
Physical Property
Is Pb chemical symbol or a chemical formula?
Chemical symbol
A mixture with a uniform composition
Homogeneous Mixture
Why was Antoine Lavoisier important to the study of chemistry?
He invented the balance to measure mass which transformed chemistry from a science of observation to a science of measurement.
Element or Compound:
CO2
Compound
These properties depend on the amount of matter and can change. Some examples include: mass, volume, and circumference.
Extensive Property
The chemical equation CH4 + O2 --> CO2 + 2H2O includes the following elements:
Carbon, Hydrogen, Oxygen
Compound
Two or more elements that are chemically combined in a set ratio.
What are some of the advantages to the research and production of bioplastics?
1. Made from renewable resources
2. Uses less energy
3. Better for the environment
Independent or Dependent Variable:
the variable that we change or manipulate
Independent Variable
Physical or Chemical Properties:
Flammability, ability to rust, toxicity
Chemical Properties
B, Al, Ga, In, Ti, Uut are all elements in the same __(period or group)__, which means that they __(do or do not)__ have similar properties.
group, do
The steps of the scientific method, in order, are ...
1. Make Observations
2. Ask Questions
3. Formulate Hypotheses
4. Test Hypotheses
5. Develop Theories / Draw Conclusions
Why doesn't the mass change during a chemical reaction?
The Law of Conservation of Mass. Matter cannot be created nor destroyed.
Reactant or Product: Sodium
2Na + Cl2 --> 2NaCl
Reactant
What type of properties would you use to determine how to separate a mixture of paperclips and staples?
Physical Properties
How many elements are in period 3?
8
Distillation
A liquid is boiled into vapor and then condensed into a liquid.
Why is chemistry impactful in careers such as culinary professionals?
Culinary professionals can determine the most efficient use of their products. When fruits and vegetables are exposed to the air, the substances, such as sugar, that make up the fruit or vegetable react with the substances in the air, such as oxygen.