examples of acids
citric acid, nitric acid, hydrochloric acid, sulfuric acid
examples of acids in everyday life
lemons, vinegar, urine
examples of bases in everyday life
soap, toothpaste, bleach,
what type of ions do acids contain?
H+
What does a plant cell have that animal cells don’t? (3 things)
vacuole, cell wall, chloroplasts
function of cell wall
to keep a rigid structure and support the cell
function of cell membrane
controls what moves in and out of the cell
function of cytoplasm
jelly-like substance where most chemical reactions happen
function of nucleus
where genetic information is kept and controls what happens in the cell
function of mitochondria
where respiration takes place, and energy is released
function of chloroplasts
contains a green pigment (chlorophyll), and is where photosynthesis takes place)
function of vacuole
contains a liquid cell sap which keeps the cell firm
tissue
group of cells working together to perform a task
organ
group of tissues working together to perform a task
organ system
group of organs working together to perform a task
organism
group of cells working together to perform a task
when exhaling, the thorax volume…
decreases
when inhaling, the thorax volume…
increases
when exhaling, the thorax pressure…
increases
when inhaling, the thorax pressure…
decreases
goitre is caused by…
iodine deficiency
scurvy is caused by..
lack of vitamin c
rickets is caused by…
lack of vitamin d
anemia is cause by…
lack of iron
similarities between solids, liquids and gases
- solids and liquids have fixed volumes and cannot be compressed.
- liquids and gases aren’t rigid and have no fixed shape.
properties of metals
high melting and boiling points, good conductors of heat and electricity, high density, malleable, ductile, shiny
properties of non-metals
low melting and boiling points, poor conductors of heat and electricity, not malleable, not ductile, dull
hooke’s law
The extension of a spring is directly proportional to the force applied
how was the solar system formed?
- 4.6 billion years ago a nebula collapsed under its own gravity.
- As it did, it became denser and began to spin more rapidly.
- This led to nuclear fusion between the debris which formed planets.
what are seasons and why do we experience them?
The Earth’s axis is tilted 23.4 degrees from vertical, meaning that as it orbits the sun, the northern hemisphere is either tilted towards the sun (summer) or away from the sun (winter). Wen it is summer in the northern hemisphere, it is winter in the southern hemisphere.
repeatability
the same person using the same method
reproducibility
a different person using a different method
