Which of the following is an example of a chemical change?
ice cream melting
fence rusting
water condensation
mixing salt and water
What is fence rusting
100
Trail mix is an example of a _________ mixture.
What is heterogeneous
100
Most are gases, except Br; Brittle in solid phase; Dull; Poor conductors; Gain electrons in chemical reactions
What is non-metals
200
What is a proton?
What is Positively charged particle of the atom;
Found in the nucleus
200
When water vapor changes to liquid water, it is called
What is condensation
200
What happens during a physical change?
a substance may look different but not lose its identity
200
By definition, an object that consists of two or more pure substances combined by physical means is called a(n):
What is mixture
200
1. What is the atomic number of:
Calcium ________
Phosphorus ________
Na ________
Fe ________
What is Calcium _20_______
Phosphorus __15______
Na ___11_____
Fe ___26_____
300
How do they (atoms) make a magnetic field?
Spinning electrons produce a magnetic field
300
In which substance are the molecules closest to each other?
oil, water, steam, iron
What is iron
300
In a sugar and water solution, what would be the solute?
What is sugar
300
substances that are evenly distributed throughout the mixture; you canNOT see the different parts
What is homogeneous
300
Name the group in the periodic table. Hydrogen is not a member, it is a non-metal; 1 electron in the outer shell; Soft, shiny, silver-colored metals; Very reactive, esp. with water; conduct electricity
What is alkali metals
400
When an atom loses or gains an electron
What is ion
400
What two quantities must be known to calculate the density of a sample of matter?
What is mass and volume
400
reaction where heat breaks down a chemical into smaller parts
What is thermal decomposition
400
Compare and contrast mixtures and compounds. Write a statement that is true about mixtures and compounds?
Mixtures contain two or more elements physically combined and compounds contain two or more elements
chemically combined.
400
Good conductors of heat and electricity. Some are used for jewelry. The transition metals are able to put up to 32 electrons in their second to last shell. Shiny
What is transition metals
500
Two or more atoms joined together
What is a molecule
500
Which of the following is NOT made of matter?
*Air in the atmosphere
*Gases on Jupiter
*The planet Earth
*Radiation from the Sun
What is radiation from the sun
500
reaction between an acid and an alkali. It forms a neutral solution
What is neutralisation
500
tell how many atoms there are in this element: Calcium Carbonate (Found in shells, eggshells, antacid) CaCO3. Be specific!