Anyone no this i need to pass the 8th grade

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

What is the molar mass of a gas that has density of 2.054 g/l