Branliest to correct answer

What evidence is there that work is being done?

A)

A lever is being used.

B)

A simple machine makes a task easier.

C)

The rock has a larger force than the boy.

D)

The boy uses force to move the rock a distance.

How did the quantum mechanical model of the atom improve on bohr's atomic model?

You have 250mL of 3M HCI. What volume will you have if you dilute it to 0.5M?

5. A fire is started in a fireplace by striking a match and lighting crumpled paper under some logs. Explain all the energy transfers in this scenario using the terms exothermic, endothermic, system, surroundings, potential energy, and kinetic

Which of these properties is a physical property of aluminum A) aluminum rusts when it is exposed to moisture and air B) aluminum is a good conductor of heat C) aluminum reacts with oxygen to form aluminum oxide D) aluminum reacts with hydrochloric

Are metallic hydrides volatile?

Match the following items. 1. balance observation using "how much". 2. graduated cylinder primary unit of mass. 3. hypothesis proposed explanation. 4. L unit of volume. 5. quantitative instrument of volume. 6. kg instrument of mass. 7.

Which is the best description of a scientific theory? a. a statement about how two different variables are related b. a collection of laws that are explained the same way c. an explanation of many observations and tested hypotheses d.

How would the electrons produced in a cathode ray tube filled with neon compare with the electrons produced in a cathode ray tube filled with chlorine gas?

Energy released from cell respiration is know as

What is a neutral atoms oxidation number