I need to make a guy jelous so i need a fake boy. friend whos up for the job!/!?!?!?!?!?!?! NOT FOR MONEY SORRY

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

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

The identities of substances are the same before and after which type of change