1.give an example of a compound machine (1pt). explain how at least two simple machines are part of this compound machine (2pts).

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

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

What is the independent variable in this investigation? mass volume sample number substance density