AnswersTX-Integrated Physics and ChemistryLab: Ionic and Covalent Bonds

Lab: Ionic and Covalent Bonds — Unit test Answers

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The equation below shows a general equation for a reaction, and the amounts of the substance are written underneath. AB + CD → AC + BD(15 g) (?) (?) (10 g)The total mass of the products is 50g. Which best completes the other two amounts?

A
The amount of CD is 40 g, and the amount of AC is 35 g.
B
The amount of CD is 35 g, and the amount of AC is 40 g.
C
The amount of CD and AC would be the same.
D
The amount of CD and AC is undetermined.
23

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and O2 gas. Which coefficients would be placed in front of water and oxygen?

A
2 in front of water and 2 in front of oxygen
B
1 in front of water and 2 in front of oxygen
C
1 in front of water and 1 in front of oxygen
D
2 in front of water and 1 in front of oxygen
24

What will most likely occur if sulfur forms an ionic bond with another element? (Click on the icon for the periodic table to view sulfur)

A
Sulfur will accept electrons.
B
Sulfur will donate electrons.
C
Sulfur will become a positive ion.
D
Sulfur will become less stable.
25

Reggie and Charlotte are baking oatmeal cookies. They dip the baked cookies in melted chocolate. The chocolate cools to form a hardened coating. Reggie argues the entire chocolate-covered cookie has undergone a chemical change. Charlotte disagrees, saying only the original oatmeal cookie has undergone a chemical change, not the chocolate coating.

A
Reggie, because baking and melting cause bonds to be broken, leading to a chemical change.
B
Reggie, because objects that are heated always undergo chemical changes.
C
Charlotte, because melting objects only sometimes cause a chemical change.
D
Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.

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