Reflection and refraction
What is the change in direction of light when it moves from one medium to another?
refraction
What are the three primary colors of light?
red green blue
Name three essential nutrients for a balanced diet.
protein, carbohydrates, fats and oils,
What type of reaction occurs when metals react with oxygen?
Oxidation reaction
What is another word for unreactive?
inert
Define the term "refraction" in relation to light.
when light changes speed
When all colors of light are combined, what color of light is produced?
white light
Why is it important to eat a variety of foods for a balanced diet?
To make sure the body functions healthily
Give an example of a metal that tarnishes when exposed to oxygen.
group 1 metals
Name a metal that is unreactive to oxygen, water and acid?
gold
Give an example of an everyday object that reflects light.
mirror
How does an object appear when it absorbs all colors of light?
black
Give an example of a meal that represents a balanced diet.
answers will vary
Explain why some metals form a protective oxide layer when exposed to oxygen.
to prevent more of the metal reacting with oxygen
Which metals reacts more with oxygen. Sodium or magnesium?
sodium
How does the angle of incidence compare to the angle of reflection?
they're the same
Explain why a red apple appears red in sunlight.
because only the red color is reflected
How can portion control contribute to a balanced diet?
it means that people will not eat too much of one nutrients causing health problems
How does the appearance of metal change when it reacts with oxygen?
it becomes dull
what is the observation for when calcium reacts with water?
violent reaction with bubbling
Describe how a magnifying glass uses refraction to work.
when light bounces off an object into the magnifying glass the light is refracted at different speeds causing the object to appear bigger
What scientific property of light determines the color we perceive?
the wavelength of light
Discuss the role of proteins in maintaining a balanced diet.
proteins are responsible for growth and repair of cells. Without it, growth will be stunted and you will not have enough energy
When alcium reacts with water what are the products?
calcium hydroxide and hydrogen
Which is more reactive aluminum or iron?
aluminium