An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?

A. 10

B. 20

C. 30

D. 0

E. 200

The chemical formula of lead sulfide tells you that it contains

Using solubility guidelines, predict whether each of the following compounds is soluble or insoluble in water. 1. MgBr2 2. PbI2 3. (NH4) 2CO3 4. ZnSO4 5. Sr (OH) 2

How many protons, electrons, and neutrons does the following isotope contain? 40 Ar

Which state of matter has the least energetic molecules?

How many molecules of H2O are equivalent to 97.2g H2O

What is called what a scientist personal opinion affects the way experimental results are reported? A. Bias B. Classifying C. Inductive reasoning D. Procedure

Coffee is decaffeinated industrially using supercritical (sc) CO2. One advantage to using scCO2 is that the polarity of the supercritical fluid can be tuned by varying temperature, pressure and cosolvent additives.

The relationship between pressure and temperature of a gas, when volume and moles of a gas are held constant, is: P*T = k. TRUE FALSE

The system is said to be in dynamic equilibrium when: Select one: a. there is no longer any net change in the concentrations of products or reactants. b. the forward and reverse reactions come to a halt. c. None of these d.

You have a 1 L container of a gas at 20 C and 1 atm. Without opening the container, how could you tell whether the gas is chlorine or fluorine? a. measure the mass of the gas b. measure the speed of the gas molecules c.