How much energy would be absorbed as heat by 75 g of iron when heated from 295 k to 301 k?

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol