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Worksheets8th grade Unit 1-2 Science Review
Total questions: 15
Worksheet time: 21mins
Refer to the Venn diagram above. Which of the elements would have the most similar chemical properties as Element I?
Tantalum
Scandium
Potassium
Strontium
Scientists believe that interactions between atoms depend mostly on the arrangement of the outermost electrons in each atom. This theory is MOST supported by the observation of similar reactions among elements...
in a period (row) of the periodic table
in a group (column) of the periodic table
with a similar atomic number
with a similar atomic mass
What makes the Noble Gases the least reactive elements on the periodic table?
They all have one valence electron in their outer shell.
They all have seven electrons in their outer shell
They all have eight valence electrons in their outer shell.
All of the elements have a full outer electron shell.
In the Bohr model of an atom (shown), protons are represented in blue, the neutrons are red and the electrons are green. How reactive is the element that this model represents?
Non-reactive because the model is showing two complete electron shells
Highly reactive because the model has two complete electron shells
Highly reactive because the model is showing only one valence electron.
Non-rective because the model is showing only one valence electron
The table shows information about two atoms, X and Y.
Atom --- Atomic Mass --- Electrons --- Charge
X ------------- 14 ----------------- 7 ------------- 0
Y ------------- 14 ------------------ 6 ------------- 0
How can these two atoms have the same atomic mass?
atom Y has one more neutron than atom X
atom Y has one more proton that atom X
atom X is a metal and atom Y is a non-metal
atom X is a liquid and atom Y is a solid
Which of these atoms has the LEAST mass?
Which of these atoms is electrically neutral?
Which of the following equations demonstrates an actual chemical reaction that forms a new substance?
Z + 2HCl → ZCl2 + H2
H2O + NaCl → H2O
Zn + Al + Cu → Zn + Cu + Al
C12H22O11 + H2O → H2O + C12H22O11
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
How many copper (Cu) atoms are there in Cu(NO3)2
1
2
5
6
This equation describes the chemical reaction that occurs during photosynthesis.
6CO2 + 6H2O → C6H12O6 + 6O2
How many elements does C6H12O6 contain?
6
12
3
24
C3H5(NO3)3 is an interesting, multi-purpose chemical compound. Nitroglycerin, also called nitro, is a heavy, colorless, poisonous, oily explosive. As a prescribed drug, it helps relax and dilate blood vessels and is often used in treating chest pain. It is also used in the manufacture of explosives, specifically dynamite, and is frequently used in construction and demolition projects. How many atoms of oxygen are in a molecule of nitroglycerin?
9
6
3
1
Acetic acid is a compound found in vinegar. The chemical formula for acetic acid is CH3COOH.
How many different elements are in acetic acid?
6
5
8
3
The chemical formula for glucose, a simple sugar, is C6H12O6.
The formula for ethanol, a fuel additive, is C2H6O.
What accounts for the differences in these compounds?
The elements that make up glucose are different than the elements that make up ethanol.
The ratio of the elements is different in ethanol than in glucose.
The chemical properties of the elements that make up the compounds are different.
Glucose has more elements than the ethanol.
Table salt is sodium chloride and has the chemical formula NaCl.
What is the ratio of sodium atoms to chlorine atoms?
2:1
1:1
1:3
2:4
A local school activity bus travels North to Denton to take students on a tour of the University of North Texas. The trip from the school to Denton is 66 kilometers. The bus travels for 56 minutes before it arrives at the UNT campus. Which of the following best represents the speed of the bus for this campus visit trip?
1.18 km/min North
2.0 km/min South
1.2 km/hr
1.18 km/min
