Biology
Chemistry
Physics
Earth/Space
Random
100
What is the name of the blood cell that carries oxygen?
Red blood cells
100
What are 2 clues that a chemical reaction took place?
temperature change
colour change
precipitates
bubbling
100
What is the formula to find speed?
speed = distance / time
100
What describes something that is short-term and only affects a small area?
Weather
100
What country was created first, China (PRC) or Taiwan (ROC)?
Taiwan
200
Is this a nutritional food? Explain why?
No
It has too much fat and a lot of carbohydrates (as sugar)
It doesn't have much protein and no fibre
200
Magnesium reacts with oxygen in water.
Write down the word equation and write the product that is made.
Magnesium + oxygen --> magnesium oxide
200
What is the law of reflection and what instrument would you use to find the angles?
angle of incidence = angle of reflection.
You use a protractor to find the angle
200
Some cars use gasoline to run. What kind of energy is this, and is it good or bad for the climate?
Gasoline is a non-renewable resource, and it is bad for it; it makes CO₂ which is a greenhouse gas.
200
Who is this guy?
Kim Jong Un
300
Explain how the structures shown in the diagram are adapted to help the gas exchange.
It has good gas exchange because:
1. good ventilation
2. good blood supply
3. one cell thick for good diffusion
300
Two students are investigating the reactivity of metals with sulfuric acid.
Data:
Metal l Obervations
magnesium l Vigorous bubbles
copper l No change
cobult l A few bubbles
zing l lots of bubbles
a) identify the hazards suggested to menimize the risk.
b) Put in order the most reative to least reactive.
a) Wear goggles and gloves
b)
magnesium , zinc , cobult , copper
300
A box has a weight of 90N and the side that is on the floor has a length of 1.2 m and a width of 0.5 m. Calculate the pressure on the ground?
pressure = Force / Area
Area = 1.2 x 0.5 = 0.60m2
pressure = 90N/0.6
P = 150 N/m2
300
What are two differences between an asteroid and a planet?
Asteroids are smaller, made only of rock or metals.
300
What has cities but no houses, forests but no trees, and rivers but no water?
A map
400
The Asian carp was introduced to America for sport fishing. Its population rapidly increased and compete with native species for food and space.
a) Suggest two reasons why Asian carp population increases rapidly.
b) Give two reasons why increases in the population of Asian carp would cause a decrease in native species of fish.
a) There are no preditors to kill them. There is a lot of food for them
b) Less food for the other fish. Not enough space or room for others.
400
Atoms make all matter.
What is found in an atom, and give the relative charge. How do atoms stay together and not fall apart?
Atoms are made of:
Nucleus (protons and neutrons)
electrons that are surrounding the nucleus.
Charges: protons (+), neutrons (o), electrons (-)
They are held together by opposite charges that attach together.
400
What are the colours of "primary colours"?
What would you see if you look at a yellow t-shirt with green light?
Primary colours are Red, Green, Blue
You would see a yellow t-shirt as green in green light.
400
What is the image, and state 4 things that are in it.
This is a galaxy.
In a galaxy are, stars, planets, moons, asteroids, comets, dust, and rocks.
400
What is the FULL name of the president of the United States?
Donald John Trump
500
Smoking is harmful for the person. It can cause a person to get a "smokers cough" after many years of smoking.
Name the drug that is addicting, and the chemical that sticks to the lungs surface. Explain, in a couple years how thier cells will look different from smoking.
drug: Nicotine
Chemical: Tar
When a person smokes, hot air goes down their trachea and bronchus, burning and destroying the cilia cells.
The person who smokes for a long time will have a difficult time removing mucus that's in their throat since there are no cilia cells to remove it. The person will have to cough a lot to remove mucus in their throat.
500
Chromatography can be used to separate dyes in ink.
Explain the in your own words, how to use chromatography.
On the bottom of filter paper, draw a line using pencil.
put a spot of ink on the pencil line.
put the filter paper in water and wait for the ink to dissolve.
until no more ink is moving up, take out and dry.
500
What do you need to make an electromagnet? What could you do to make it stronger? (two things)
You need a power source, wires, and an iron bar.
To make it stronger, you can use a stronger power supply and have more turns around the iron bar.
500
Describe how a solar system was formed.
It was made when all the gases and dust formed together in the centre.
After there was a reaction which created the sun.
All rocks were collected near the sun, and planets were made by rocks colliding with eachotehr.
The gas and dust were collected far away from the sun and gas planets and comets were made.
500
How did people get to Australia 30,000 years ago when they didn't have boats?
They walked.
30000 years ago, the ocean was much lower because of the ice age, and they walked from Asia all the way to Australia.
