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WorksheetsChemistry District Final Preview
Total questions: 11
Worksheet time: 22mins
This diagram shows two regions, the nucleus (1) and the area surrounding the nucleus (2). Where is most of the mass concentrated, and why?
In region 1, because that is where the massive protons and electrons are located.
In region 1, because that is where the massive protons and neutrons are located.
In region 2, because that is where the electrons are located.
In region 2, because that is where the protons and neutrons are located.
Which of the following models represent neutral atoms?
A only
B only
D only
A, B, and D
What causes an atom to become a positively charged ion?
An atom becomes a positively charged ion when it loses an electron.
An atom becomes a positively charged ion when it loses a proton.
An atom becomes a positively charged ion when it gains an electron.
An atom becomes a positively charged ion when it gains a proton.
The table provides information on the number of electrons, protons, and neutrons in four different atoms. Based on the data from the table, which atom has a negative charge?
Atom A
Atom B
Atom C
Atom D
Based on its relative position on the periodic table, what conclusion can be drawn about the number of protons in an atom of silicon?
Silicon has the same number of protons as phosphorus.
Silicon has two more protons than aluminum.
Silicon has one less proton than phosphorus.
Silicon has the same number of protons as aluminum and phosphorus.
This chart shows some ions. Which of the following chemical formulas is correctly written?
Na2O
Li(CO3)2
BrNH4
2Ba3N
The reactants for a certain chemical reaction are shown. Cu(NO3)2 + KOH →. Which of the following shows the correct product or products of this reaction?
Cu(OH)2 + KNO3
CuK2 + OHNO3
Cu(NO3)2KOH
CuOH + K(NO3)2
Provided here is an unbalanced chemical equation. MgCl2 + K3PO4 → Mg3(PO4)2 + KCl
Which of the following shows the product side of the correctly balanced equation?
→ 4Mg3(PO4)2 + 2KCl
→ 2Mg3(PO4)2 + 3KCl
→ Mg3(PO4)2 + 6KCl
→ 3Mg3(PO4)2 + KCl
Which column of elements would be most
likely to chemically combine with sodium in a 2:1 ratio?
N, P, As
O, S, Se
F, Cl, Br
In a laboratory demonstration, a balloon filled with methane and oxygen was exposed to a flame. The result was a brief, large flame. The students were asked to formulate an equation for the reaction. One answer is below.
CH4 + O2 → H2O
Is this equation correct? Why?
This equation is not correct because there is no C in the products.
This equation is correct because combustion reactions produce H2O.
This equation is correct because of the law of conservation of mass.
This equation is not correct because combustion reactions do not produce H2O.
Where does the majority of the mass of an atom come from?
The majority of the mass of an atom comes from the electrons and neutrons.
The majority of the mass of an atom comes from the electrons and protons.
The majority of the mass of an atom comes from the electron cloud.
The majority of the mass of an atom comes from the protons and neutrons.
