Question

science 7 hindenburg explosion post - test (paper version)

1. a student sees the following safety symbols associated with an investigation, instructions indicate that a chemical reaction will occur when the student co liquids that are at room temperature. based on the safety symbols shown al chemical reaction will the student likely observe?

a. the liquids will change color.
b. the liquids will turn into solids.
c. the liquids will release toxic gas.
d. the liquids will generate thermal energy.

1. a molecule of $h_{2}so_{4}$ contains how many atoms?

a. 3
b. 6
c. 7
d. 8

Explanation:

Question 1

Step1: Analyze the safety symbols

The "Heat hazard" symbol indicates that heat will be involved. Insulating gloves are used to protect from heat.

Step2: Evaluate each option

• Option A: No symbol related to color change.
• Option B: No symbol related to phase change to solid.
• Option C: No symbol related to toxic gas.
• Option D: The heat - hazard symbol implies thermal energy (heat) generation.

Step1: Count atoms in \(H_2SO_4\)

• Hydrogen (\(H\)): There are 2 atoms (from \(H_2\)).
• Sulfur (\(S\)): There is 1 atom.
• Oxygen (\(O\)): There are 4 atoms (from \(O_4\)).

Step2: Sum the number of atoms

$$2 + 1+4=7$$

Answer:

D. The liquids will generate thermal energy.

Question 2