A
which of these is not found in an aninal cell?
Chloroplast or Cell Wall
This controls which substance can get into and out of the cell?
Cell membrane
The smallest particle of an element
Atom
What are the poles of magnet called?
North and South
The formula for density is
mass/volume
this is where proteins are made
Ribosome
A substance containing 2 or more atoms chemically bonded together
Molecule
The first shell holds 2 electrons. How many electrons can the other shells hold?
8
How do we know if a substance is less dense that water?
it will float in water
The angle between the normal and the ray of light leaving a mirror.
angle of reflection
what do we use to measure the volume of an irregular shaped object?
A displacement can
matter is defined as anything that has ____________ and volume
A. Mass B. Density C. Length D. Height
A. Mass
A ray of light bouncing off a mirror
reflected ray
We identify elements by the number of _________ in their nucleus.
Proton
Which method would you use to separate two liquids with different boiling point?
Distillation
What happens to light when it passes from air into water?
The light bends toward the normal because water is denser than air. This process is called refraction.
Why can you see your face in a mirror?
Because light reflects off the mirror and travels back to your eyes. This is called reflection.
Which method would you use to separate an insoluble solid from a liquid?
Filtration
2 or more substance not chemically bonded together
Mixture
State the law of reflection.
The angle of incidence is equal to the angle of reflection.
if an object has a mass of 10 kg and a volume of 2 m3, what is its density?
5 kg/m3
Which group in the periodic table is this referring to. "They are unreactive because they have a complete outer shell of electrons"
Noble gases or group 8
What is the difference between reflection and refraction?
Reflection is the bouncing back of light from a surface, while refraction is the bending of light when it passes through different materials.
which method would you use to separate a mixture of coloured dyes?
Chromatography
A certain molecule is composed of exactly 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms. What is the chemical formula of this molecule?
H2SO4