Question

what is a large number written before a compound in a chemical reaction called? (6.8 points)
a. coefficient
b. subscript
c. superscript
d. roman numeral
question 2 of 29
what are elements and/or compounds present prior to a chemical reaction called? (6.8 points)
a. coefficients
b. products
c. reactants
d. ingredients
question 3 of 29
in a chemical reaction what are the new substances produced called? (6.8 points)
a. ingredients
b. reactants
c. products
d. chemicals
question 4 of 29
how many total atoms in the compound? (1.4 points)
extra content
3nahco₃
a. 9
b. 12
c. 15
d. 18
e. 21

Explanation:

Step1: Analyze the first question

In a chemical reaction, the large number written before a compound is called a coefficient.

Step2: Analyze the second question

Elements and/or compounds present prior to a chemical reaction are called reactants.

Step3: Analyze the third question

In a chemical reaction, the new substances produced are called products.

Step4: Analyze the fourth question

For the compound \(3NaHCO_3\), in one \(NaHCO_3\) unit: \(1\) (Na) \(+1\) (H) \(+1\) (C) \(+3\) (O) \(=6\) atoms. Since there are \(3\) units (due to the coefficient \(3\)), \(3\times6 = 18\) atoms.

Answer:

1. A. coefficient
2. C. reactants
3. C. products
4. D. 18