Which of the following is not a simple machine

A pulley

B Elevator

C screw

D wheel and axle

How did Neils Bohr describe electrons in his atomic model?

An aspirin tablet contains 75.0 mg of aspirin, which has the molecular formula, c9h8o4.

What characteristic would make a scientific report suitable for a general, non-scientific audience? (Select all that apply) use of metaphors a highly structured format detailed description of materials and methods use of non-technical language

A certain weak acid, ha, has a ka value of 6.0*10-7. calculate the percent ionization of ha in a 0.10 m solution.

What is the molar mass of water H2O? what is the molar mass of calcium chloride CaCl2? what is the molar mass of copper (II) sulfate CuSO4? what is the molar mass of silver nitrate AgNO3? what is the molar mass of sulfuric acid H2SO4?

How to get 1m solution to 0.001m solution?

If something is in high resolution you can see and object but not very clearly. True or False.

Which change might cause a cold spell in the northern united states

Kipps appratus is for what?

Which of the following statements about protons are true? Protons have twice the mass of neutrons. Protons have the same magnitude of charge as electrons but are opposite in sign. Protons have a charge of 1+.