Question

1. is a change in state a physical change or a chemical change? (0.5 points) *

physical change
chemical change

1. when dry ice is at room temperature it goes from the solid state to the gas state. what is the name of this process? (0.5 points) *

enter your answer

1. when burning 180 g of glucose in the presence of 192 g of oxygen, water and carbon dioxide are produced. if 108 g of water is produced, how many grams of carbon dioxide are produced? (1 point) *

enter your answer

Explanation:

Step1: Physical change definition

Physical change: no new substance formed.

Step2: State change type

State change retains chemical composition.

Step1: Sublimation definition

Sublimation: solid→gas directly.

Step2: Dry ice process

Dry ice (solid CO₂)→gas CO₂ directly.

Step1: Total reactant mass

180g + 192g = 372g.

Step2: Total product mass

Products: 108g (water) + x (CO₂).

Step3: Solve for CO₂ mass

x = 372g - 108g = 264g.

Answer:

A. Physical change