Which statement describes all chemical changes, but not all physical changes? 1.bubbles are produced

2.A new substance forms.

3.phase changes occur

4.a color change occurs

An object's buoyant force and weight mean the same thing.a. trueb. false

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer

If a simple machine reduces the strength of a force, what must be increased?