WorksheetsChemistry Pre Comp
Total questions: 38
Worksheet time: 21mins
Where is the proper place to dispose of liquid waste at the end of a lab?
the sink
the garbage
the sink with running water
back in its container
Which is this symbol
Flammable
Oxidizer
Health Hazard
Environmental Hazard
Which represents the corrosive symbol?
(a) founded the nucleus.
What is the difference between matter and non matter?
Matter has mass,
non matter doesn’t
Matter takes up space, non matter does not
Non matter does not take up space and matter does
All of the Above
Compound or Mixture?
Compound
Mixture
What are molecules?
Two or more elements
Include Heterogeneous & Homogeneous
Two or more atoms
I don’t know
The two types of mixtures are _______ and _______
(a)
Did a chemical reaction occur?
Which subatomic part of an atom gives it a positive charge?
Neutron
Proton
Electron
Nucleus
What is the smallest 'building block' of the elements that make up the universe?
An atom
An electron
A proton
A cell
An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have?
0
7
6
13
If salt is dissolved in water, water is the ____________
Solution
Solute
Solvent
Suspension
The image shows the periodic grid for SODIUM. What is Sodium's atomic mass?
11
12
23
Impossible to tell
Who proposed the following model for the atom?
"Atoms are solid spheres. Each element is made of a different type of atom."
Bohr
Chadwick
Dalton
Rutherford
In 1897, J J Thomson discovered the electron. This led him to propose the (a) -pudding model of the atom.
What was the overall charge of an atom in the plum pudding model?
Positive
Negative
Neutral
It depends on the atom
In 1909, Ernest Rutherford performed his alpha scattering experiment. He fired alpha particles at very thin foil made of (a) .
In Bohr's model, the electrons orbit the nucleus in (a) .
An atom is electrically neutral because
the numbers of protons and neutrons are equal.
the numbers of protons and electrons are equal.
neutrons balance the protons and electrons.
Which of the following statements is correct?
Protons are positively charged and neutrons are negatively charged.
Protons are negatively charged and electrons are positively charged.
Protons are positively charged and electrons are negatively charged.
Who is the person credited with the formation of the "plum pudding" model?
Thomson
Rutherford
Bohr
Dalton
Who is credited with developing model D?
Thomson
Dalton
Bohr
Rutherford
Dalton's model of the atom is represented by which letter?
A
B
C
D
E
Who discovered the subatomic particle "electron"?
Dalton
Thomson
Rutherford
Bohr
Who discovered the nucleus of the atom?
Dalton
Thomson
Rutherford
Bohr
Where is number one pointing at?
Nucleus
Protons
Neutrons
Electron cloud
Which of the following statements are true about the nucleus?
It is neutrally charged
It is positively charged
It contains most of the mass of the atom
It is almost empty space
Where is number two pointing at?
Nucleus
Protons
Neutrons
Electron cloud
Which of the following statements are true about the electron cloud?
It is neutrally charged
It is negatively charged
It is almost empty space
It contains most of the mass of the atom
Who established that "electrons move around the nucleus at fixed distances called orbitals"?
Dalton
Thomson
Rutherford
Bohr
What is the meaning of the greek word "atomos"?
Invencible
Invisible
Indivisible
Independent
