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WorksheetsChemical Equations and Charge
Total questions: 21
Worksheet time: 28mins
Al + O2 --> 2Al2O3
HgO --> 2Hg + O2
How many valence electrons does magnesium have?
6
12
2
10
What are valence electrons?
electrons in the outermost energy level
electrons in the innermost energy level
positively charged ions
energy used for attraction in a shell
How many valence electrons does elements in group 16 have?
16
1
6
0
What is an ion?
a positively charged atom
a negatively charged atom
a neutral charged atom
both a and b
What is a cation?
a negatively charged ion
an ion with many charges
a positively charged ion
What defines the octet rule?
Contains element symbol and valence electrons
atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
The electrons in the outermost energy level of an atom that influence how an element will react with other substances
What is an anion?
a positively charged ion
a negatively charged ion
a neutral charged ion
How many protons, neutrons, and electrons does a neutral Selenium (Se) have?
34, 45, 34
34, 34, 45
45, 45, 45
45, 34, 34
Is the equation balanced (yes or no)?
Cl2+2KBr → 2KCl +Br2
(a)
When Lead Nitrate reacts with potassium iodide, Yellow precipitate of ............. is formed
PbI2
KNO3
Pb(NO3)2
PbIO3
What does the symbol inside the circle mean?
"yields, or produces"
"dissolved in water"
"forms a precipitate"
"released as a gas"
When balancing this equation, Fe + Cl2 → FeCl3, the correct coefficient for Cl2?
1
2
3
4
Balance this equation, CaCO3(s) → CaO(s) + CO2(g)?
3,1,2
1,1,1
1,3,1
2,6,3
PCl5+_ H2O→_ HCl+H3PO4
Write a balanced chemical equation for the following reaction.
Iron metal reacts with water to form Fe3O4 and hydrogen gas.
