Which one of the following is a base?

A. HCI

B. Cu (OH) 2

C. HNO3

D. HC2H3O2

What is the ratio of molecules in the chemical equation below N2+3N2-> 2NH3 4:2 2:2:1:3 1:3:2 2:1:2

What is the mass, in grams of 2.80 L of CO2 at STP (Standard pressure) ? -The topic i'm learning is Gas laws

Which of the following is most closely related to the unit of time that humans call the month? A. the revolution of the Earth once around the Sun B. the cycle of the Moon through all its phases C. the rotation of the Sun once on its axis D.

Which action is the best example of a direct observation

125 cm3 of solution contains 3.5 moles of solute. What is the molarity of the solution?

Which electrical circuit is designed to produce light? A) an MP3 player B) a generator C) a flashlight D) an air conditioner

Describe the difference between a monoprotic acid and a triprotic acid. How does a triprotic acid generate hydrogen ions?

Which of the following do scientists use to form a hypothesis?.

How many moles of carbon are in 7.87x10^7 carbon molecules?

The phases of the moon are caused by the changing positions of the Earth and the Moon in relation to the Sun. Which items could best be used to represent the Sun, the Earth, and the Moon in a model that shows the phases of the Moon? A.