This wood screw is a simple machine. It is

A) a wheel and axle.

B) a second class lever.

C) a movable pulley system.

D) an inclined plane wound around a shaft.

In an experiment, the density of an unknown liquid was calculated to be 0.78 g/ml. if the accepted value is 0.75 g/ml, calculate the percent error made.

How many milliliters of chcl3 are needed to prepare a 2.5% v/v solution in 500 ml of methanol?

When an atom in a reactant gains electrons, what happens to its oxidation number? A). Its oxidation number decreases. B). Its oxidation number doubles. C). Its oxidation number increases. D). Its oxidation number increases by one. E).

Which of the following is an intensive chemical property of a box of raisins? A. total number of raisins B. calories per serving C. total calories D. grams per serving E. totalgrams

Which of the following is true for a cell that has a nucleus? A. It will not have nuclear membrane. B. It will not have a nucleolus. C. It will not have ribosomes. D. It will not have a nucleoid.

How to write complete ionic and net ionic equations?

chromium can combine with chlorine to from corneum chloride which equation is a correct representation of this reaction

What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.0%), and one with mass = 65.32 amu? (a) 65.3 amu (b) 64.4 amu (c) 64.9 amu (d) 65.0 amu (e) 64.8 amu

Is this base a physical or chemical property?

Classify each of the following aqueous solutions as a nonelectrolyte, weak electrolyte, or strong electrolyte. a) LiClO4 b) HClO c) CH3CH2CH2OH d) HClO3 e) CuSO4 f) C12H22O11