Atoms
What is the building block of matter?
Atoms
What kind of table are elements sorted?
periodic table
Is breaking a pencil a physical change? Why?
yes. Nothing new is created
Are fireworks a chemical change? Why?
yes. Unexpected color change. Combustion
Give an example of an autotroph.
Where are protons and neutrons located?
In the nucleus
Give an example of an element.
Answers vary
Is painting a wall a physical change? why?
yes because we are just changing the appearance of the wall.
Is cooking pancakes a chemical change? Why?
yes. gases and bubbles form while cooking.
Define organelle and give an example.
Organ of a cell. Nucleus, cell membrane, lysosome, .....
What does the atomic number tell us?
Number of protons in the nucleus
Define toxicity.
poisonious
Is melting iron a physical change? Why?
Yes. Changing state of matter.
Is iron rusting a chemical change? Why?
yes. New substance being formed.
What does the prefix deci- mean.
one hundredth
Name the 3 subatomic particles and their charges.
Neutron neutral
proton positive
electron negative
Define Reactive.
having a tendency to react chemically.
Give two examples of a physical change
Give two examples of chemical change.
answers vary.
How does gravity relate to mass?
More mass more gravity.
What is the atomic mass formula
neutrons + protons
In what direction do families go on the periodic table?
In what direction do periods go on the periodic table?
Families are vertical
periods are horizontal
What are the 5 pieces of evidence of a physical change?
change in color, change in texture, change of shape, change in temp and change in state of matter.
What are the 6 pieces of evidence of a chemical change?
New substance created , unexpected color change, unexpected temp change, combustion, precipitates, bubbles.
What is Cellular respiration? What are the products of it?
How cells make energy. water, carbon dioxide, and energy