A star has a spectrum with lines indicating the presence of ionized helium. This star should be classified as a (n)

O

A

G

M

Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese (IV) oxide. 4 HCl (aq) + MnO 2 (s) ⟶ MnCl 2 (aq) + 2 H 2 O (l) + Cl 2 (g) A sample of 40.5 g MnO 2 is added to a solution containing 47.7 g HCl.

I'm trying to find the molarity of H2SO4 in this calculation. I attempted it but I still need someone to check my work. I used 10.00 mL of H2SO4 and the volume added to it was 24.97 mL of the 0.0924M NaOH solution.

An iron ore was found to contain 92.0% pyrite (fool's gold). Pyrite has the formula FeS2and is 46.5% iron. How many grams of iron are there in 50.8 grams of iron ore?

Identifique a equação que forma uma base: a) 2NaOH+2SO=Na2SO4+H2O b) 2NO2+2O=HNO2+HNO3 c) H2O+CaO=Ca (OH) 2 d) SO2+H2O=H2SO4 e) 2Mg+O2+2MgO

Which of the following results when hydrogen and chlorine chemically bond to form hydrogen chloride?

1. Which of the following species determines the chemical properties of an atom? A. Electron B. Neutron C. Nucleus D. Proton 2. The following glasswares are used to measure the volume of liquids except A. graduated beaker B. pipette C. test tube D.

A sample of a certain material has a mass of 2.03 x 10-3 g. calculate the volume of the sample, given the density is 9.133 x 10-1 g/cm3.

What happens to a reactant molecules when forming product molecules

Which is the atomic number of an atom with six valence electrons

O2 + CS2 → CO2 + SO2 Which of the following shows the equation balanced?