Which of the following ions came from an atom that gained 2 electrons?

A. 0^2-

B. Li+

C. Mg^3+

D. N^3-

If the absorbance at 555nm wavelength of a 0.35 moles/liter sample of stained protein has an absorbance of 0.12, what is the concentration of a sample whose absorbance is 0.26. use beer's law.

What are the three categories of scientific reasoning described by Aristotle

Which is a type of protein?

Which of the following is true for balancing equations? The number of products should be equal to the number of reactants. The properties of products should be the same as the properties of reactants.

Which of the following is a possible formula unit? PbO Li2B Al2Pb3 ClO

Which indicator will be the same color in hydrochloric acid as it is in pure water? 1. methyl orange 2. phenolphthalein 3. bromcresol green

Based on your knowledge of energy resources conservation, which of the following statements is true? a) Manufacturers can increase a light bulb's energy efficiency by using technology that decreases the amount of electromagnetic energy the bulb

Ammonia (nh3 (g), hf = - 46.19 kj/mol) reacts with hydrogen chloride (hcl (g), hf = - 92.30 kj/mol) to form ammonium chloride (nh4cl (s), hf = - 314.4 kj/mol) according to this equation:

How does an electromagnet create a magnetic field

Magnetism, reactivity, and fluorescence are three special properties used to identify minerals. true or false