Atomic Structure
& Matter Properties
& Matter Properties
Which subatomic particle has a positive charge?
Proton.
What process do plants use to make glucose?
Photosynthesis
Is melting ice a physical or chemical change?
Physical.
Where does most mechanical digestion occur?
In the Mouth.
What do we call the rate at which distance changes over time?
Speed
Where are electrons found in an atom?
In the electron cloud around the nucleus.
What is the main source of energy for most food chains?
The Sun
Mencion at least two signs of a chemical change
-Color change
-Odor
-Gas formation
-Temperature change
-Production of light, sound or a solid (like rust).
What gas is exchanged into the blood in the lungs?
Oxygen.
Is velocity a scalar or a vector quantity?
Vector.
What information does the atomic number tell you about an element?
The number of protons.
What's the other name for Autotrophs and Heterotrophs?
Producers and Consumers in that order.
What separation technique is used when you prepare a coffee (not instant or soluble)?
Filtration.
Which enzyme breaks down starch into sugars?
Amylase.
What happens to an object under balanced forces?
It stays at rest or moves at constant speed.
Give one property that usually distinguishes metals from non-metals.
Metals conduct electricity (or are shiny/malleable); most non-metals do not.
What is the difference between a food chain and a food web?
A food chain shows one path to show energy flow, being simpler; a food web show multiple interconnected paths, being a more complex and realistic way of showing the energy flow.
What is the difference between a compound and a mixture?
Compounds are chemically bonded; mixtures are physically combined.
What is the difference between aerobic and anaerobic respiration?
Aerobic uses oxygen; anaerobic does not.
Name two forces that slow down moving objects.
Friction and air resistance. (May also be Gravity, Magnetism or even a push)
Using kinetic theory, explain why heating a substance increases particle movement.
Heat adds energy, causing particles to move faster.
Why do energy levels decrease as you move up a food chain?
Energy is lost as heat and through more complex life processes at each level.
Wich of the follow are compounds and wich ones are mixtures?
Salt, Coke, Water, Coffee, Sugar, Air
Tricky one, wasn't it?
Compounds:
-Salt (Na Cl),
-Water(H2O),
-Sugar (C12H22O12)
Mixtures: Coke, Air, Coffe
Explain how the respiratory and digestive systems work together to release energy.
Digestion provides glucose; respiration uses oxygen to release energy from glucose.
Why does streamlining help objects move faster through air or water?
because it guides fluid (air/water) smoothly around them reducings it's resistance.