Which of the following substances most likely contains a covalent bond? Check all that apply. * 10 points
Bronze, a metallic alloy
Cu
Ti
MgSO4
C6H6
BCl3
Pb
MnO2
KOH
Brass, a metallic alloy
NH3
S2Br2
H2O
Al
C8H18
NaCl
CCl4
N2O4
Al(OH)3
CaCO3
C12H22O11
NaHCO3
Steel, a metallic alloy
K3PO4
NF3

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.

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.

Which of the following would not diffuse through the plasma membrane by means of simple diffusion? 1 oxygen 2 glucose 3 a steroid hormone 4 a lipid soluble vitamin