Lab Safety
What should students wear to protect their eyes in the lab?
Safety goggles
Molecules in a solid move by __________.
Vibrating in place
A mixture that looks the same throughout is called __________.
Homogeneous
The periodic table organizes elements by their __________.
Properties
Melting ice is an example of a __________ change.
Physical change
What tool helps stop a small fire from spreading?
Fire extinguisher
Which has a definite volume but no definite shape?
A liquid
Which is a heterogeneous mixture?
A mixture that is not uniform throughout, you can see the different components
Ex: Chocolate chip cookie dough
Elements that are shiny, bend into wires, and conduct electricity are __________.
Metals
Burning paper is an example of a __________ change.
Chemical change
Which is NOT considered proper lab safety?
Eating food in the lab
When water boils, particles gain __________ energy.
Kinetic energy
Air is an example of what type of mixture?
Homogeneous
Elements that are poor conductors and brittle are __________.
Nonmetals
A student freezes water into ice cubes. What type of change is this?
Physical change
Why are aprons important in science labs?
They protect clothing and skin from spills
Changing from liquid to gas is called __________.
Evaporation/boiling
A student stirs sugar into water. Is this homogeneous or heterogeneous?
Homogeneous (solution)
An element that has properties of both metals and nonmetals is called a __________.
Metalloid
Mixing vinegar and baking soda produces bubbles. What type of change is this?
Chemical change
Name two pieces of safety equipment you should always use when comparing densities of liquids.
Aprons & goggles
Explain why gas spreads out to fill a container while solids do not.
Gas particles move freely; solids are tightly packed
Give one example each of a homogeneous and heterogeneous mixture.
Homogeneous: salt water OR smoothie; Heterogeneous: salad
Name one Rare Earth element.
Yttrium (Y), Lanthanum (La), or similar examples
Give two pieces of evidence that show a chemical change has occurred.
Gas production, color change, heat/light, new substance formed