What is dark matter and what is dark energy what are some comparisons and differences of the two
explanation will get brain!

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

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?