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Unit 3 Test-Chemical Bonding

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1.
1 point
Balancing a chemical equation so that the same number of atoms of each element is found in both the reactants and the products is an illustration of
2.
1 point
Which of the following elements has a valence of +2?
3.
1 point
In which type of reaction do ions in two compounds switch places ?
4.
1 point
What type of element tends to lose electrons when it forms bonds ?
5.
1 point
The force of attraction between metals and nonmetals is a(n) ______ bond
6.
1 point
A shorthand description of a chemical reaction using chemical formulas and symbols is a chemical
7.
1 point
Which of the following is the chemical formula for dinitrogen monoxide ?
8.
1 point
Which of the following is the correct chemical formula for calcium chloride ?
9.
1 point
During chemical changes, an aluminum atom can lose its 3 electrons in the third energy level to another atom. What is the symbol of the resulting aluminum ion ?
10.
1 point
Which of the following is the chemical formula for carbon dioxide?
11.
1 point
What is the charge of an ion that contains 11 protons and 10 electrons ?
12.
1 point
A substance that speeds up a reaction without being permanently changed is called a(n)
13.
1 point
Sodium is in a Group 1. How many valence electrons does sodium have ?
14.
1 point
Which of the following is an example of a single-replacement reaction?
15.
1 point
The first energy level is the closest to the nucleus and can hold up to ______ electrons
16.
1 point
The joining of atoms to form new substances is
17.
1 point
The equation below is an example of which type of chemical reaction ?
NaCl + AgF ---> NaF + AgCl
18.
1 point
Which of the following is NOT a metallic property?
19.
1 point
A + sign denotes that an element will
20.
1 point
The new substances produced in a chemical reaction have
21.
1 point
The force of attraction between the nuclei of atoms and the electrons shared by the atoms is a(n) __________ bond.
22.
1 point
The total mass of the reactants must equal
23.
1 point
Determine the balanced equation for the following.

H2 + O2 --> H2O
24.
1 point
How many nitrogen atoms are in the chemical formula Ca(NO3)2?
25.
1 point
Which type of element is most likely to gain electrons when it forms bonds ?
26.
1 point
The outer energy level of every element, except for H and He, can hold up to _____ electrons.
27.
1 point
The number of _____ is most important in determining how an atom will bond.
28.
1 point
In the valence, -2, this tells that the atom will
29.
1 point
What is the charge of an ion that contains 16 protons and 18 electrons ?
30.
1 point
Most atoms form bonds using only the electrons in their ______ energy level.
31.
1 point
Atoms bond by _______ electrons.
32.
1 point
Which of the following is the formula for sodium fluoride?
33.
1 point
The properties of ductility and malleability are associated with which type of bonds?
34.
1 point
Atoms of elements in Groups 1 and 2 have _____ their group number.
35.
1 point
A substance that slows down or stops a chemical reaction is called a(n)
36.
1 point
_______ are formed by atoms losing electrons.
37.
1 point
Which of the following formulas is representative of a compound formed from Calcium and Neon?
38.
1 point
When a chlorine atom becomes Cl-1 ion, it ____________ in the third energy level.
39.
1 point
A reaction in which a single compound breaks down to form two of more simpler substances is a
40.
1 point
The starting materials in a chemical reaction are
41.
1 point
Electrons in an atom are organized
42.
1 point
If Al+3 is combined with O-2, then there will be ______ Oxygen atoms.
43.
1 point
Enzymes in your body act as catalysts. Thus, the role of the enzymes is to
44.
1 point
Which element has a full outermost energy level containing only two electrons ?
45.
1 point
Oxygen is in Group 16. How many valence electrons does oxygen have?
46.
1 point
A chemical reaction in which energy is released or removed is
47.
1 point
Chlorine is in Group 17. How many valence electrons does chlorine have ?
48.
1 point
How many atoms are represented by the formula CaCO3 ?
49.
1 point
In which area of the periodic table do you find elements whose atoms easily gain electrons ?
50.
1 point
Determine the balanced equation for the following.

Al + HCl --> AlCl3 + H2
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