Which can a drop of liquid mercury can be described as?

A. A pure substance and a compound

B. An impure substance that is reactive

C. An impure substance that is unreactive

D. Pure substance and an element

Which best explains why a crystal is incompressible?

Which order shows decreasing current? A, B, C С, А, В С, ВА

What does the 4 mean in the formula 4Na2SO3?

What horizontally-applied force will accelerate a 400-kg crate at 1 m/s^2 across a factory room floor against a friction force of half its weight? A) 600 N B) 1600 N C) 2000 N D) 2400 N E) None of the above

According to the diagram shown on the right, how does energy flow in an ecosystem? A. Energy flows from producers to the Sun and from producers to consumers. B Energy flows directly from the Sun to both producers and consumers.

How was bohr atomic model similar to Rutherford's model

A rigid container filled with a gas is placed in ice. What will happen to the pressure of the gas? And what will happen to the volume?

A man is sitting on a 20 m height building and his mass is 50 kg. Calculate the mechanical energy.

Which of the following correctly describes which types of waves travel through which types of mediums? A) Transverse waves travel through solids, liquids, and gases.

Niko was hiking in the mountains when he found a spring, or a place where water naturally flows out of the ground. Where did the water in the spring come from? A. It is water that was squeezed out of an igneous rock when the rock changed. B.