Science
Matter
Anything that has mass and occupies space.
element
a pure substance that cannot be broken down into any other substances
chemical formula
a combination of symbols that represent the elements in a compound
1. The study of the properties of matter and how mater changes is called___________________.
chemistry.
6. The basic particle from which all elements are made is a molecule? True!
7. When atoms combine, the force of attraction that holds them together is a___________________.
8. How many atoms of hydrogen are in this water molecule?
7. chemical bond
8. 2
chemistry
The study of the properties of matter and how it changes.
atom
the basic particle from which all elements are made
mixture
two or more substances that are mixed together but not chemically combined
2. True or False: Table sugar and table salt are pure substances.
True!
9. What is a compound?
10. What is the ratio of atoms in carbon dioxide, or CO2?
11. What is the formula of carbon monoxide? (hint: mono means one)
9. A pure substance made of 2 or more elements chemically combined in a set ratio.
10. 1 carbon atom to 2 oxygen atoms.
11. CO
substance
matter that is pure; has specific set of properties
chemical bond
the force that holds atoms together
heterogeneous mixture
a mixture in which pure substances are unevenly distributed throughout the mixture
3. A _________________property is a characteristic of a pure substance that can be observed without changing the substance into something else.
physical
12. T or F? When elements chemically combine, they usually form compounds that have properties that are similar to those of the uncombined elements. FALSE
13. A ____________is made of two or more substances that are together in the same place but are not chemically combined.
13. mixture
physical property
a characteristic of a substance that is shown w/o changing it into another substance
molecule
a neutral particle made of two or more atoms
homogeneous mixture
a mixture in which substances are evenly distributed throughout
4. Properties of matter (Let's think about these and look up if needed.)
a. Chemical b. physical c. physical d. chemical
e. physical f. chemical
14. What are two ways in which mixtures differ from compounds?
15. ?
16. T or F? A solution is an example of a homogeneous mixture?
a. Each substance is a mixture keeps its individual properties. b. The parts of a mixture are not combined in a set ratio.
15. Heterogeneous mixtures? a. damp soil d. salad
16. true
chemical property
describes the ability of a substance to change into a new substance
compound
a pure substance made of two or more elements that are chemically combined
solution
a well-mixed mixture containing a solvent and at least one solute.
(salt dissolved in water is a solution; air is a solution)
5. A pure substance that cannot be broken down into any other substances by chemical or physical means is an ___________________.
element
17. List four methods that can be used to separate mixtures, and give an example of each method.
magnet--
filter--
distillation--
evaporation--