Elements&Compounds
This is a pure substance made of only one type of atom.
Element
Which of these are examples of physical changes?
burning wood
cooking an egg
freezing popsicle
freezing popsicle
What is the average speed when traveling 130 miles in 2 hours?
65mph
Newton's First Law of Motion is-
An object in motion will stay in motion will stay in motion and an object at rest will stay at rest until acted upon by an unbalanced force
Describe convection, conduction and radiation
convection - currents
conduction - direct contact
radiation - waves
How are compounds different from elements?
Compounds can be broken down/two or more different elements chemically combined
A physical change affects ______ but not the substance itself
size/shape/state
Difference between velocity, speed, displacement
Velocity is speed with direction
speed is distance/time
displacement is how far away from starting point
Using your knowledge of Newton’s 1st Law, explain why seatbelts are important in cars.
Without a seatbelt, a person's inertia causes them to continue moving at high speed during a crash, leading to impact with the steering wheel, windshield, or ejection from the vehi
Heat travels from....
Hot to cold
Acetic acid is CH3COOH. How many hydrogen atoms are in one molecule of acetic acid?
4
Name a sign that a chemical change has occured
color change
odor change
participate formed
A car traveled a distance of 200 kilometers in 1 hour. The car stopped for 1 hour and then traveled an additional 150 kilometers in 2 hours.
87.5mph
Describe Net Force
all forces acting on an object
How does temperature relate to the motion of particles in a substance?
Higher temperatures mean faster particle motion.
The chemical formula for methane is CH4.
Total atoms present in 2 molecules of methane?
10 atoms
Describe solute,solvent,concentration and dilution.
solute: what is being dissolved
solvent: liquid that does the dissolving
concentration: adding more solute
dilution: adding more solvent
what type of line represents NO MOTION on a distance time graph?
horizontal
A 17-newton (17 N) force and a 25-newton (25 N) force are applied to a wagon at the same point in opposite directions. What would be the
effect of these forces?
The wagon would move toward the 17N side.
If the temperature in the room is 75° F,
what temperature would a cup of ice water
need to reach for thermal equilibrium?
75
Sodium sulfate (Na₂SO₄)
Which elements are represented in the formula AND how many atoms of each element are represented in the formula?
Elements: Sodium, Sulfur, Oxygen
Atoms: Na: 2 S:1 O:4
What 3 factors affect the rate of dissolution?
Temperature
Agitation
Surface area
The Valdez family traveled from New York City to Washington, DC. They left at 12:00 p.m., traveled 95 miles, and
stopped to eat in Philadelphia. They continued driving another 135 miles and arrived in Washington, DC, at 5:00 p.m.
What was the family’s average speed?
46mph
Describe inertia
Object continues in its current state of rest or motion.
Motion is changed by an outside force.
Example of conduction, convection and radiation
teacher discretion