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WorksheetsReporting Period 1 Review
Total questions: 25
Worksheet time: 2hrs 5mins
How many valence electrons are in an atom of each element in Group 18?
(a)
A student mixed liquid detergent and baking soda. When the two are combined, bubbles are produced. Which statement is correct?
baking soda and liquid detergent repel on another and bubbles were produced
the two produced bubbles because the law of conservation of mass was not correct
the two produced bubbles with is an evidence that a chemical reaction occurred
the two produced bubbles which indicated a physical change
Which is NOT a physical change?
cutting an apple
the apple dries out
the apple appears brown
the apple is chopped into small pieces
Which of the following describes each element in the chemical formula: C6H12O6S
C-6 atoms, H-12 atoms, O-6 atoms, S-1 atom
C-12 atoms, H-12 atoms, O-6 atoms, S-2 atom
C-6 atoms, H-6 atoms, O-6 atoms, S-1 atom
C-6 atoms, H-12 atoms, O-12 atoms, S-2 atom
If an element is a very stable gas, in which group does it belong?
1
2
17
18
Which element is least reactive?
Mg
As
Kr
K
What subatomic particles are found in the nucleus of an atom?
positive and negative charged particles
positive charged particles only
neutral charged particles only
positive and neutral charged particles
An element is shiny, silver in color, brittle solid, and a semi-conductor. What type of element is this?
metal
nonmetal
metalloid
noble gas
Which element is found in period 3 and 7 valence electrons?
Ar
Cl
Br
Mn
Iron, Nitrogen, and Argon are found in the periodic table. Which of the following describes these elements?
iron is malleable and conducts electricity
nitrogen is malleable and does not conduct electricity
argon is malleable and conducts electricity
all three are malleable and conduct electricity
How many neutrons in an element that has 13 protons and a mass number of 27?
(a)
How many oxygen atoms are in: (CO3)2NH
(a)
What is the density if the mass is 4.54 g and a volume of 2.0 cm3? Round your answer to the nearest hundredths.
(a)
If an element contains 54 protons and 8 valence electrons, which best describes the element?
the element is calcium and not reactive
the element is krypton and very reactive
the element is xenon and not reactive
the element is xenon and very reactive
Use the following skittle colors to answer the question.
Cl-yellow, H-black, C-green, O-blue
Based on the following chemical formula, which best describes the correct skittle colors?
ClHCO2
1-yellow, 1-black, 1-green, 2-blue
1-yellow, 1-black, 1-green, 1-blue
1-yellow, 2-black, 1-green, 2-blue
2-yellow, 1-black, 1-green, 1-blue
What is the difference in the number of electrons in an atom of chlorine, Cl, and the number of electrons in an atom of nitrogen, N?
(a)
When you combine two clear liquids, you observe that a white solid formed in the container. What can you conclude about this observation? You can select more than one answer.
a precipitate formed
a physical reaction occurred
a chemical reaction occurred
a chemical change occurred
An unknown object has a mass of 25.2 grams and a volume of 2.0 cm3. What is the density?
(a)
If an element has 20 protons, 20 neutrons, and 2 valence electrons, what is the name of the element?
Ca
Mg
Ne
K
What is the mass of calcium carbonate (CaCO3), to the nearest hundredth of a gram?
(a)
For investigation a student records data for four unknown substances. Using the provided tables of the densities of the unknown substances and the densities of the known substances.
Which unknown substance is most likely carbon?
Substance 1
Substance 2
Substance 3
Substance 4
What mass of oxygen, to the nearest hundredth of a gram, is required for this chemical reaction?
(a)
Find the difference in the number of electrons in an atom of Chromium, Cr, and the number of electrons in an atom of Bromine, Br?
(a)
The element contains 77 protons, 77 electrons, and a mass number of 192. How many neutrons are in this atom?
(a)
Based on these drawings, which element is the least reactive?
Argon, because of the eight valence electrons
Aluminum, because of the three valence electrons
Chlorine, because of the seven valence electrons
Potassium, because of the one valence electron
