Lab Safety/Scientific Method
Which piece of safety equipment should you use to protect your eyes during a lab?
Goggles
Which is an example of a physical property?
Ductility
What is the smallest unit of matter?
Atom
Define PE and KE
PE and KE
What causes the seasons on Earth?
Earth’s tilt on its axis
What is the BEST way to smell a chemical safely?
waft
Which is an example of a physical change?
Melting ice
Which particle has a positive charge?
Polly the positive proton
Which example shows an unbalanced force?
A. A book resting on a table
B. Two students pushing a cart with the same force in opposite directions
C. One student is pushing harder on a cart than the other
D. A car stopped at a red light
C
When the Northern Hemisphere is tilted toward the Sun, it experiences —
Summer
You see smoke coming from a hot plate that isn’t supposed to be turned on. What should you do FIRST?
Tell the teacher immediately
Which list includes ONLY physical properties?
A. Density, melting point, boiling point
B. Flammability, odor, mass
C. Reactivity, color, ability to rust
D. Ability to burn, density, temperature change in reaction
A
Which list contains ONLY heterogeneous mixtures?
A. Smoke, Kool-Aid, air
B. Trail mix, salad, granite
C. Salt water, coffee, steel
D. Vinegar, brass, fog
B
A student graphs distance over time. The line becomes steeper. What does this show?
A. The speed decreased
B. The speed increased
C. The object stopped
D. The time restarted
B
Which location has the least change in seasons?
Equator
What is a hypothesis?
An educated guess
Bubbles form when vinegar is mixed with baking soda. What is the BEST explanation?
A chemical reaction is producing a gas
Example of a compound
CO2
A student pushes a cart harder and it accelerates more quickly. Which law does this demonstrate?
2 (F=MxA)
Spring tides occur when —
A. The Sun and Moon pull at right angles
B. The Earth blocks sunlight
C. The Sun and Moon line up
D. The Moon is not pulling on the ocean
The Sun and Moon line up
What is the acronym you learned for the scientific method??
People Really Hate eating Dead Cockroaches
-Problem
-Research
-Hypothesis
-Experiment
-Data
-Conclusion
What is the acronym that helps us indicate a chemical change?
O
S
C
G
L
T
P
A student makes sugar water by stirring sugar into warm water until it dissolves.
Which substance is the solute, and which is the solvent?
C — Sugar = solute, Water = solvent
Two teams pull on a rope. Team A pulls with 300 N to the right. Team B pulls with 200 N to the left. What is the net force?
100N R
A diagram shows the Moon in the first-quarter phase. What type of tide would you expect?
Neap