Chemistry
What are the 4 pieces of evidence of a chemical change?
Colour change
Energy
Gas
Solid (precipitate)
Which organelle makes proteins in the cell?
Ribosomes
What source of light is a glow stick an example of?
Chemiluminescence
List the 3 main greenhouse gases
Water vapour, carbon dioxide, methane
In which stage of mitosis do the chromosomes line up in the middle?
Metaphase
What is the difference between ionic & covalent compounds?
Ionic = metal & non-metal that trade electrons
Covalent = two non-metals that share electrons
Which stage in the cell cycle is the longest?
Interphase
A security mirror is an example of what type of mirror?
Convex
True or false: Sunlight can pass through the greenhouse gases
True
How many valence electrons does oxygen have?
6
What is the name of this compound: CCl4 ?
carbon tetrachloride
What is the function of a red blood cell?
Carries oxygen
What is the difference between reflection & refraction?
Reflection = light bounces off a surface and changes direction
Refraction = light "bends" as it passes from one medium to another
What type of radiation gets trapped in by the greenhouse gases?
Infrared radiation
Which produces hydrogen ions (H+) when dissolved in water - an acid or a base?
Acid
What is the chemical formula for copper (II) phosphide?
Cu3P2
Which organ in the digestive system does the majority of digestion & absorption of nutrients?
Small intestine
If light was passing from a substance of high optical density to low optical density, will the light bend towards or away from the normal?
Bend away from the normal
Without greenhouse gases, would the earth's average temperature be warmer or colder than it is?
Colder
What is the difference between sensory neurons & motor neurons?
Sensory = from sensory receptors to brain
Motor = from brain to muscles, to contract
What type of reaction is the following:
Zn + Cu2SO4 --> 2Cu + ZnSO4
Single displacement
Is your heart muscle an example of a voluntary or involuntary muscle?
Involuntary
In a converging lens if a ray of light passes through the focus, it will refract where??
Parallel to the principal axis
List 3 pieces of evidence that climate change is happening
- Global temp is rising
- Ice sheets melting
- Ocean getting warmer
etc.
What location does the object need to be placed at in front of a concave mirror in order to get no image?
At F (focal point)