What two things do you need to know in order to find the density of an object?
What is mass and volume?
100
This is the basic unit of matter
What is an atom?
100
Identify one element found in period 2.
What is Li, Be, B, C, N, O, F, Ne?
100
Gold is a ______________
what is a pure substance?
100
Matter exists in three different states. These states are: ___________, ___________, _____________.
What is solids, liquid, and gas?
200
Why can wood float over water?
Because it has a lower density than water.
200
Positively charge part of an atom.
What is a proton?
200
What element is found in period 4, group 17?
What is Bromine (Br)?
200
Sand is a _______________
What is a mixture?
200
How are the molecules in gases different from the molecules in solids?
The molecules in gases move quickly and are further apart whereas the molecules in solids are compressed tightly and do not move around freely.
300
What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3?
What is 0.85 g/cm3
300
The property of water that allows a lizard to run over water.
What is surface tension?
300
Which element has an atomic number of 82?
What is lead?
300
Sugar is a ________________
What is a compound?
300
The difference between mass and weight is that...
Mass is not affected by gravity whereas weight depends on the force of gravity on an object.
400
Calculate the mass of a liquid with a density of 3.2 g/mL and a volume of 25 mL.
What is 80 grams?
400
The property of water that allows water to stick to a cup.
What is adhesion?
400
What is the atomic mass of calcium?
What is 40.078 amu?
400
Carbon dioxide is a _______________
What is a compound?
400
Describe what happens to the molecules inside of an ice cube as you add more energy to it.
The molecules inside the ice cube are tightly compressed. As you add more energy, the molecules start moving around more freely and the ice cube melts into water.
500
Describe how density is related to the packing of molecules.
Objects with a lower density tend to have molecules that are spread out whereas objects with higher densities tend to have the molecules more closely together.
500
An element has 8 protons, 8 electrons, and 10 neutrons. What is the element's atomic number?
8
500
Describe how scientists organize the periodic table.
Reading from left to right, they are arranged in increasing atomic number (protons )
Each period (going across) increases in atomic number
Elements in each group have similar properties.
Metals are on the left, nonmetals on the right and metalloids along the zig-zag line that divides the metals and nonmetals, inert gases on the far right
500
What is the difference between a mixture and a compound?
Compound has substances that are chemically combined whereas mixture has substances that are not chemically combined (can be separated into their individual components)
500
Describe the processes through which liquid water changes into a gas and a solid.
Water can change into gas when it is heated up. This process is called evaporation. Water can change into solid through the process of freezing.