Cde Science Review

Quiz
•
Chemistry
•
8th Grade
•
Hard
+2
Standards-aligned
Charles Martinez
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which statement accurately describes the atoms of a specific element?
An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.
A scandium Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.
An aluminium, Al, atom contains 27 electrons and 27 protons inside the nucleus.
A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.
A Calcium, Ca, atom contains 29 protons inside the nucleus and 29 outside the nucleus
Tags
NGSS.MS-PS1-1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many protons, neutron, and electrons are present in an atom of hafnium, Hf, with a mass number of 178
72 protons, 178 neutrons, 106 electrons
72 protons, 106 neutrons, 72 electrons
178 protons, 250 neutrons, 72 electrons
106 protons, 72 neutrons, 106 electrons
80 protons, 121 neutrons, 80 electrons
Tags
NGSS.MS-PS1-1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Based on these drawings, which element is the least reactive?
Neon, because it has two energy levels with eight electrons in the second level.
Chlorine, because it has three energy levels with seven electrons in the third energy level.
Gallium, because it has four energy levels with three electrons in the fourth level.
Tin, because it has five energy levels with four electrons in the fifth level.
Tags
NGSS.MS-PS1-1
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?
Boron is the most reactive because it has the most protons.
Fluorine is the most reactive because it has 7 electrons in the outer shell.
Silicon is the most reactive because it has an equal number of protons and neutrons.
Gallium is the most reactive because it has many more neutrons than protons.
Tags
NGSS.HS-PS1-1
NGSS.HS-PS1-2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which table was completed correctly?
Tags
NGSS.HS-PS1-1
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many valence electrons are in an atom of each element in Group 15 in the periodic table?
4 valence electrons
5 valence electrons
6 valence electrons
7 valence electrons
8 valence electrons
Tags
NGSS.HS-PS1-1
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which chemical reaction involves the fewest oxygen atoms?
2AgNO3 + K2SO4 --> Ag2SO4 + 2KNO3
4Fe + 6H2O + 3O2 --> 4Fe(OH)3
6CO2 + 6H2O --> C6H12O6 + 6O2
C2H4 + 3O2 --> 2CO2 + 2H2O
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