Which of the following are propositions? Assume that Q(x) and R(x) and predicates, and that the domain is the set of positive integers. Select all the apply.

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What are simple substances which cannot be decomposed by ordinary chemical means?

Which of the following is hydroxide ion?

Which branch of chemistry deals with mostly carbon-containing compounds?

True or False? Ammonium ion is a cation.

I understand that I need the following in order to correctly take and submit an exam so that it won’t be “Flagged” by Honorlock.   -reliable internet access – a webcamera and a microphone – a quiet space so that extraneous noise will not “flag” my exam as having a problem – a flat surface on which to place my computer so that excessive movement will not “flag” my exam -a background free of photos, drawings, and images of faces   I also understand that moving my face out of the webcam frame can “flag” my exam, causing the program to alert the professor of a possible breach of conduct.

Iron reacts with oxygen in the air in a combination to produce iron (III) oxide (or rust) according to the following reaction:  4  Fe (s)  +   3 O2 (g)  →  2 Fe2O3 (s)    If a 29.0 g iron pipe is left outside, allowing it to react with excess oxygen in the air until it is all converted to rust, what is the mass of Fe2O3 produced?

Consider the reaction below: H2S (g) + Cl2 (g) → S (s) + 2 HCl (g) The element                   is undergoing oxidation and                     is the oxidizing agent.

A system performs 111 kJ of work on its surroundings and gains 89 kJ of heat. What is the value of ΔE (in kJ) for the system?