In a chemical change the combination of what changes

Suggest one way to detect the oxygen level in a safer way. give one reason for your suggestion.

What is the difference between weight and mass? mass and weight are both intrinsic properties of an object. if you multiply the mass of an object by the acceleration due to gravity, you will obtain the object's weight.

You have a rock with a volume of 15 cm 3 and a mass of 45 grams. What is its density?

45 j of 100 j of was used to turn on the television what is the percentage of energy used

When you drop a penny off the roof of a building, it takes 10 seconds to reach the ground. How high is the roof?

During melting, the forces of attraction between the molecules A) become weaker. B) remain the same. C) become stronger. D) become stronger and then weaker.

What law states that when matter undergoes a physical or chemical change, no atoms are created or destroyed?

If the moon disapared what affect would this have on earths tides

Newtons first law states that no force is required to maintain motion in a straight line at a constant speed. If newtons first law is true, why must we continue to pedal a bicycle on a level surface to keep moving?

A box is lowered using a rope. If the acceleration of the box, is 3.3 m/s2 (downward) and its mass is 29.1 kg, what is the magnitude of the tension in the rope?