WorksheetsChemistry CDB 1 Review
Total questions: 24
Worksheet time: 18mins
Why did most alpha particles pass through the gold foil in Rutherford's experiment?
The atom is made of protons, neutrons and electrons.
The alpha particles are negatively charged.
The atom is made of mostly empty space with a very small and dense, positively-charged nucleus.
The mass of the isotopes can change.
Select all that are correct.
Energy, wavelength and frequency are related. The higher the frequency ...
the shorter the wavelength.
the longer the wavelength.
the more energy in the wave.
the less energy in the wave.
Element A has a frequency of 5.4x1014 Hz.
Element B has a frequency of 2.7x1014 Hz.
Which element has more energy?
Element A
Element B
Unknown, because you must also know the wavelength.
Calculate the average atomic mass of an element with 2 isotopes. 80% of the atoms have an isotopic mass of 12 amu and 20% have an isotopic mass of 13 amu.
12.0 amu
12.2 amu
12.4 amu
12.6 amu
The dot structure shown could indicate which of the following:
a group 13 element
a group 14 element
a group 15 element
a group 16 element
Which of the electron configurations is correctly matched with its element?
Sodium: 1s2 2s2 2p6 2d1
Magnesium: 1s2 2s2 2p6 3s2
Boron: 1s2 2s2 2p3
Neon: 1s2 2s2 2p6 3s2
Which of the following is a chemical property?
capable of conducting electricity
has a density of 2.7 g/cm3
forms compounds with chlorine
melts from a solid to a liquid at 660.3oC
Phase changes are NOT chemical changes because --
they are only exothermic
they are nuclear reactions
water can only dissolve other substances, and cannot react with them.
no new substances have formed.
Mass is an extensive property because
the mass changes when the size of the sample changes
the mass will be the same because it can be compacted into a smaller space.
the mass is same as the density.
the boiling point changes when you add more of the sample.
Which of the following best describes the particles when substances change from solid to liquid to gas?
Solids are compact and close together; liquids are more fluid and have some space between the particles; gases have a lot of space between the particles.
Solids have loosely-held, larger particles; liquids are more have some space between the particles, but are mostly rigid, and unable to move; gases have a lot of space between the particles.
Solids are compact and close together; liquids are more have some space between the particles, but are mostly rigid, and unable to move; gases have smaller, fast-moving particles.
Check ALL that describe the properties of a gas at room temperature (22oC).
no definite shape
no definite volume
easily compactible
little space between the molecules.
Which of the following diagrams represents a mixture?
Q and R are mixtures
P, S and T are all mixtures
P and Q are mixtures
R and T are mixtures
Elements in the same ______________ have similar physical and chemical properties.
period
electromagnetic field
group
compound
Why are group 17 elements so reactive?
Group 17 needs only one electron to fulfill the Octet Rule
Group 17 elements form positive cations.
Group 17 elements have low densities.
Group 17 elements have a full valence shell.
Which of the following is correct?
Atomic size will increase as you move across the period and down a group.
Atomic size will decrease as you move across the period and down a group.
What is wrong with the following electron dot diagram?
The diagram is correct
There should be double bonds between phosphorus and chlorine
The number of electrons is incorrect.
The electrons should have been transferred to show ionic bonds.
Which Lewis structure correctly represents magnesium oxide?
The diagram above represents metallic bonding. What are properties of elements that bond this way?
good conductors of heat and electricity
usually a gas
brittle solids
forms ionic compounds
Which of the following models represents a water molecule?
Name the compound P2O5.
diphosphorous pentoxide
phosphorous (II) oxide (V)
phosphorous pentoxide
phosphorous (V) oxide (II)
Write the chemical formula for boron trifluoride.
BF3
B3F3
F3B
B(III)F3
Write the formula for copper (II) fluoride.
CuF
Cu2F
Cu2F2
CuF2
What set of coefficients will balance the following chemical reaction?
Al2O3 --> Al + O2
1, 2, 3
4, 2, 1
2, 4, 3
2, 2, 3
When the following reaction has been balanced, what will be the coefficient on CO (carbon monoxide)?
Fe2O3 + CO --> CO2 + Fe
1
2
3
4
