Round off each of the following numbers to two significant figures:

(a) 0.436

(b) 9.000

(c) 27.2

(d) 135

(e) 1.497 X 10-3

(f) 0.445

A solution is prepared by dissolving 20.1 g of MgCl2 with the addition of 157.0 mL of water (density of water is 1.00g/cm3). The density of the resulting solution was determined to be 1.089g/cm3.

Which methods could be used to dilute a solution of sodium chloride (NaCl) ?

A 118-ml flask is evacuated and found to have a mass of 97.129 g. when the flask is filled with 768 torr of helium gas at 35? c, it is found to have a mass of 97.171 g.

16. Sulphuric acid + Sodium hydroxide is equal to Sodium sulfate + water. a. Acid + metal b. Acid + alkalic. c. Acid + carbonated. d. None of the above Which is correct?

If an element is skinny it has

According to the quantum-mechanical model of the atom established by shrödinger, where may the electrons of an atom be found?

Renewable resources cannot be replaced in our lifetime

How do you make a guy who is extremely into you, even though he knows you aren't single, to bug off?

A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is

Which of these particles is the smallest? A. an atom B. a nucleus C. a proton D. an electron