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Studying materials scientifically
Check back later if you want to see Kahoot for tomorrow's test. Now, I'm going to add answers to Review Sheet, Part 2.
Hey folks, Mr Goldsmith here. Going to start answering those study guide questions. Check back every few minutes for more answers.
6th Grade SMS Test Review Sheet:
1.
Write 2 safety rules in a science
lab:
· Wear goggles, scrunchie, gloves and/or
apron
· No horseplay (no running, throwing,
dropping), etc.)
2.
What are hazardous materials?
·
substances
that are harmful to human health or the environment
3. Name and define three types of hazards that we
focused on in class:
Corrosive – property of a
substance that reacts with a solid material. Ex: sulfuric and other acids
corrode metals like iron.
Flammable - a substance
that catches on fire when exposed to spark, flame or heat.
Toxic - Poisonous if inhaled, ingested or absorbed
through skin. "Ingested" means swallowed.
4. What is volume?
How much space an object takes up
5. How do you calculate volume? (Answer for each subpart)
4. What is volume?
How much space an object takes up
5. How do you calculate volume? (Answer for each subpart)
a.
Write the formula for a
rectangular solid V = L x W x H
b.
draw a picture of a rectangular
solid
Here, draw a rectangle (I can't get it to work on the blog, but you know what a rectangle looks like)
Here, draw a rectangle (I can't get it to work on the blog, but you know what a rectangle looks like)
c.
show its length, width and height including appropriate metric units for each
...... and write a number next to each side, such as 6cm long, 4 cm high and 2 cm wide - just make up whole numbers. Metric units would be cm, m, mm.
...... and write a number next to each side, such as 6cm long, 4 cm high and 2 cm wide - just make up whole numbers. Metric units would be cm, m, mm.
d.
then apply the formula to find the
solid’s volume
For example, a rectangle that is 6cm long, 4 cm high and 2 cm wide - has Volume of 48 cm3, since V = L x W x H, or 6cm X 4 cm X 2 cm = 48 cm3.
e. for a cylinder the formula for volume is V = Pi x r2 x H
For example, a rectangle that is 6cm long, 4 cm high and 2 cm wide - has Volume of 48 cm3, since V = L x W x H, or 6cm X 4 cm X 2 cm = 48 cm3.
e. for a cylinder the formula for volume is V = Pi x r2 x H
6. a. 15mL | b. 37 mL | c. 41 mL d.22 mL |
|
Mass is the amount of matter
in an object,usually measured in grams.
B) for the example (the solid) that you drew in
question 5, make up a mass including an appropriate metric unit.
Use a multiple. Ex: if your
solid has V= 10cm3, choose mass of 100g
8. How would you
separate each of the following mixtures into parts? You have a set of tools: strainer or sieve
(screen), filter such as a funnel with filter paper, dropper, and vial with
top, forceps, magnet, heat source like a hot plate or sunlight). Which tools
would you would use to separate the following mixtures?
a.
macaroni from vegetable soup?
Use a filter/strainer and
forceps
b.
oil and vinegar?
Use a dropper and vial
c.
Water and sand?
Use a screen, sieve, or other
filter. Use sunlight?
d.
saltwater?
Use
a
heat source
e.
Little bits of dried sponge and of nickel (a magnetic metal);
Use a magnet
f.
Rocks and sand.
Use
a forceps or strainer
9.
What is density?
how
much matter is in a certain volume (how much “stuff” is in a “space”)
10. You have a solid object (ex: a pebble).
a.
If you drop the pebble in a graduated
cylinder filled with water, what will happen to the pebble?__ sink_____________
b.
What does that tell you about the
density of the pebble compared to the water? pebble is more relatively dense than water
11. If you have 2 liquids in a bottle (ex: oil and vinegar), what will the less
dense liquid do: float or sink in the other liquid?
float
12. What are properties?
The nature of a material, Properties are how we determine what material we are looking at, and how we use that material. A substance's characteristics that help us describe it, classify it, understand it, and use it.
13. Why are properties important in
science?
They allow us to determine (describe, classify and use) substances/objects
14. What are physical properties? Give at least 3 different examples of
physical properties.
A
characteristic that you can observe without changing the substance. ex: color, shape, mass, volume, density
15. What are chemical properties? Give at least 2 different examples of
chemical properties.
A
characteristic that you can observe only by changing the substance. ex: react chemically with acid or base, does
it burn, does it corrode?
16. Acids and bases are corrosive chemicals that can react with and destroy metal
and living tissue. On a scale that runs
from 0-14, pH is a measurement of how acidic (0-6 ) or basic
(8-14 ) a solution is. A solution that
has a pH of 7 is neutral, meaning it is neither acidic nor basic. Stronger acids have the lowest numbers, and
stronger bases have the highest numbers.
What does the pH of a solution with pH 3 tell us? The solution is ……
A
strong acid
17. How do you calculate density of a regular solid? Use your examples from questions 5 and 6 to
calculate the density of the solid that you described
D = m/v
18. What is evidence?
data or information that can be used to prove
an answer
19. What are some hazardous substances that you can find in your home?
Windex, bleach, natural gas or cooking gas, nail polish remover, insecticides, drain cleaner, etc.
20. If you found
an unlabeled jar containing something that might be hazardous, what would you
do?
tell
a parent; don’t touch or smell it
may have to take it to haz mat waste site
22. What are some precautions you can
take when you find an unknown substance in your home?
Tell an adult about it; don’t touch or smell it.
6th Grade SMS Test Review Sheet, pt. 2
23. Summary of Table:
* Plastic (P.E.T.E.) is a solid at 20oC or 68 oF has a density of 1.4 g/ cm3F, does not react with acid, and looks shiny and red.
* Iron is also solid with a density of 7.87 g/cm3, reacts with sulfuric acid and has a silver or red (rust) color.
* Aluminum is also solid with a density of 2.7 g/cm3, reacts with heated sulfuric acid and has a silver color that is coated with white.
24.
IF given a cylinder of each material, which tests
could you use to tell the difference between each material?
a.
Place in oil
b.
Smelling the substance
c.
Drop the materials in sulfuric
acid
d.
Drop it on the floor and Listen to
sound
25.
If you have two bars of silver colored metal
of the same volume, how could you tell which one was iron and which was
aluminum?
b.
will react in hot sulfuric acid
c.
Iron will feel heavier
d.
Iron will feel lighter
26.
Which of the following is evidence
that one substance is chemically reacting with another? When the substance(s):
a.
Gives off light, smoke, or odor;
b.
Gets hotter or colder;
c.
Gives off bubbles, gas, or a
precipitate (causes solids to fall to the bottom);
d.
When the properties of the
substances become different.
e.
All of the above.
I can't show the picture here without messing up this blog post even more, but for this
rectangular cube:
27.
Will this cube float or sink in water (density of water = 1
g/cm3)? Explain why.
(Hint: if you can’t answer it, answer
the next 3 questions, then come back to this).
The cube's density of 3 g/cm3 is greater than water's density of 1 g/m3, so the the cube will sink.
28.
What is the volume of this cube?
a.
23 cm
b.
60 cm2
c.
60 cm3
d.
180 g
3.
What is the mass of this cube?
a.
23 g
b.
60 g
c.
60 cm3
d.
180 g
4.
What is the density of this cube?
a)
.3 g/cm3
b)
3 g/cm3
c)
180 g/cm3
d)
15 g/cm3
5.
Explain and write a procedure for how you would find the
density of a weirdly-shaped rock:
1.
Pour 25 mL of water in a graduated
cylinder that the rock will fit into, and record as initial volume (Vi).
2.
Add the rock.
3.
Measure and record the final
volume (Vf).
4.
Find the volume of the rock by
calculating Vi -Vf.
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