Chemistry
What is the melting point, and the boiling point of water?
Melting point = 0 degrees Celsius
Boiling point = 100 degrees Celsius
What is a shadow?
Dark area formed when light is blocked by an object
Animals and Plants have become suited to where they live. This is known as
Adaptation
Name the 3 simple machines we learned in class
Pulley, Lever, Gears
A student performed an experiment to test how many grams of salt can dissolve in 100cm^3 of water.
Their first result was that only 40g of salt can dissolve. Describe what they must do to make this result more reliable.
Repeat the experiment again (to get more data).
What methods of separating mixtures would you use to separate sand+salt mixture? (In Correct Order)
Dissolving, Filtration, Evaporation
a. Why does Planet A takes 88 days to orbit the sun, but planet B takes 225 days to orbit the sun?
b. Why does a day on Jupiter lasts only 10 hours but a day on Earth lasts 24 hours?
a. Planet A is closer to the sun, etc
b. Jupiter spins on its axis faster than the Earth does
a. What is the difference between breathing and respiration?
Breathing = Air in and out of lungs
Respiration = Oxygen being used by our organs
Why does the Earth have Days and Nights?
Because it spins on its own axis
Clive wants to see how quick 12g of salt dissolves in 70 cm^3 of water. Name 3 main equipment needed for this experiment.
Measuring cylinder
Weighing scale (or balance)
Stopwatch (timer/clock)
What kind of change occurs when bicarbonate of soda is added to vinegar?
Explain why.
An irreversible(or chemical) change occurs because a new substance is formed.
Why can we see the beach on a sunny day?
The light from the sun hits the beach and then reflects back into our eyes
a. What is the function of the Heart?
b. Explain why pulse rate increases during exercise.
a. To pump blood around the body
b. During exercise, our muscles need more oxygen/nutrients. The heart pumps blood faster and so the pulse rate increases.
Why does a whistle has a higher pitch/frequency than a thunder?
It vibrates more time per second (or any acceptable answer related to vibrations)
Name 2 safety precautions a student must take when doing an experiment that involves: boiling a beaker of water and then cooling it in front of an AC.
Safety glasses, heat gloves, (or other acceptable answers)
The boiling points for 4 substances are:
Substance A = 30C, Substance B = 70C, Substance C = 15C, Substance D = 100C
a. Which substances are liquids at 60C?
b. Which substances are gases at 40C?
a. Liquids at 60C = A, B and C
b. Gases at 40C = C only
Explain the length of the shadow relative to the position of the Sun in the sky.
long shadows when the sun is lower in the sky (mornings and afternoons/evenings)
shadow shortest when the sun is the highest in the sky
Label the following meanings with the correct scientific word from the stages of digestion: (5 points).
a. Breaking down food
b. Moving food from mouth to stomach
c. Removing undigested waste
d. Taking food into the mouth
e. Digested food moving into the blood
a. Breaking down food = Digestion
b. Moving food from mouth to stomach = Swallowing
c. Removing undigested waste = Excretion
d. Taking food into the mouth = Ingestion
e. Digested food moving into the blood = Absorption
Draw a simple parallel circuit consisting of a 4 cell battery, two bulbs, a motor and two switches. However, EACH switch must be able to control EACH bulb.
(Acceptable response on whiteboard)
Clive wants to test if 20g of substance A, B and C each can dissolve in 100cm^3 of water.
a. State three variables that must be kept the same to make the experiment fair.
b. What variable does he change in this experiment?
a. temperature of water, volume of water, 20g of substance, (or other acceptable answers)
b. Type of substance
EXPLAIN in detail, how you would separate a mixture of Sand, Iron filing, and Sugar.
2. Pour water into remainder
3. Filtration process (Pour into filter paper, sand stay behind sugar water goes through)
4. Heat the sugar water. Sugar stays behind, water evaporates
a. Explain how current and voltage is shared or the-same for components in a series circuit.
b. Explain how current and voltage is shared or the-same for components in a parallel circuit.
c. What is an important advantage of a parallel circuit?
a. Series circuit = Same current, Total voltage shared
b. Parallel circuit = Same voltage, total current shared
c. Advantage = When one component breaks, other components will still work
a. Our _____ help us stand up straight and shape our bodies. Our _____ help attach the muscles to the bones. Our _____ help bend or rotate parts of your body. Our _____ help move our bones by contraction or relaxation.
b. Blood Vessel that carries blood away from our heart are called _______. Blood Vessel that carries blood back to our heart are called _______.
a. Bones, Tendons, Joints, Muscles
b. Arteries, Veins
Igneous (hot liquid rock from under earth, etc....)
Sedimentary (when rocks are transported and piled up somewhere, etc...)
Metamorphic (rocks subjected to high heat and pressure, etc..)
A student does an experiment. He finds out that in 100cm^3 of water, 54g of solid A can dissolve, 0g of solid B can dissolve, and 85g of solid C can dissolve.
a. What is the conclusion he can make about the solubilities of all three substances?
b. Name 1 thing he should keep the same during the experiment to make it a fair test?
c. Why should the student repeat the experiment again?
a. Solid C is the most soluble (or Any other acceptable response)
b. temperature of water, volume of water, (or any other)
c. to get more reliable results