Question

14 multiple choice 1 point
coefficients can be represented as...
○ elements.
○ subscripts.
○ whole numbers.
○ exponents.
15 multiple choice 1 point
what are the products in a reaction between copper (cu) and silver nitrate (agno₃)?
cu + 2agno₃
○ ag + 2cu(no₃)
○ ag(no₃) + 2cu
○ 2ag(no₃) + cu
○ 2ag + cu(no₃)₂

Explanation:

Question 14

In chemical equations, coefficients are the numbers placed in front of formulas to balance the equation. They are whole numbers (e.g., 1, 2, 3...). Elements are the substances, subscripts indicate the number of atoms in a molecule, and exponents are not used for coefficients. So coefficients are represented as whole numbers.

This is a single - displacement reaction. In a single - displacement reaction, a more reactive metal displaces a less reactive metal from its compound. Copper (Cu) is more reactive than silver (Ag). The general form of the reaction is \( \text{Metal}_1+\text{Metal}_2\text{Compound}
ightarrow\text{Metal}_2 + \text{Metal}_1\text{Compound}\).

For the reaction between copper (Cu) and silver nitrate (\( \text{AgNO}_3\)):
The unbalanced equation is \( \text{Cu}+\text{AgNO}_3
ightarrow\text{Ag}+\text{Cu(NO}_3\text{)}_2\)
To balance the equation, we need 2 moles of \( \text{AgNO}_3\) to balance the nitrate ions and 2 moles of Ag. So the balanced equation is \( \text{Cu}+2\text{AgNO}_3
ightarrow2\text{Ag}+\text{Cu(NO}_3\text{)}_2\)
So the products are \( 2\text{Ag}\) and \( \text{Cu(NO}_3\text{)}_2\)

Answer:

C. whole numbers

Question 15