Select all that apply.
1: which of the following particles are of approximately equal mass?
a: protons
b: electrons
c: neutrons
d: quarks

2: if the atomic number of an element is 16, then it has 16 electrons.
true
false

3: an unknown substance is tested and found to have the following physical properties:
brittle
fair conductor of electricity
dull (not shiny)
the substance is most likely a
a: metal
b: metalloid
c: nonmetal
d: can not be determined without more data

Calculate the molarity of the solution. 6.02 x 1022 molecules of hci (molecular weight = 36.5 g/mole) in 2.0 liters of water m

Explain that newton first law,second law and third law of motion?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.