Consider oxygen, which has an atomic number of 8 and an atomic mass of 16. how many valence electrons does it have? a. 2

Which of the following equations represents an exothermic reaction? (Select all that apply.) NH3 (g) + 12.0 kcal ½N2 (g) + 3/2 H2 (g) C (graphite) C (diamond), H = - 0.

1. Write a brief account of Ernest Rutherford's personal and professional life in no more than 150 words.

What is the SI unit used to measure the temperature of a substance?

When ammonium chloride (nh4cl) is dissolved in water, the solution becomes colder. is this process endothermic or exothermic and what can you conclude about the relative magnitude of lattice energy versus heat of hydration for this process?

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Which is not a characteristic of a compound? It is a mixture of elements. It has properties that differ from its component elements. It has a fixed proportion of elements.

Can you think of other possible ways scientists can determine what climate was like in the past besides studying ice cores?

Which sub-layer thins out into space, where there is no air

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, nh4br, and aqueous lead (ii) acetate, pb (c2h3o2) 2.

A magnesium atom has 2 valence electrons in its third shell. Which is a TRUE statement about what happens when it forms an ion? A. It will be an anion. B. It will have more electrons than protons. C.