When does a cold front develop?

when a cold air mass invades a warm air mass

when two masses of warm air meet

when two masses of cold air meet

when a warm air mass invades a cold air mass

The chemical equation below shows the reaction between tin (Sn) and hydrogen fluoride (HF). Sn + 2HF SnF2 + H2 The molar mass of HF is 20.01 g/mol. How many moles of Sn are required to react with 40 g of HF? 1 2 3 4

An ice cube at 0.00 ˚C with a mass of 8.32 g is placed into 55 g of water, initially at 25 ˚C. If no heat is lost to the surroundings, what is the final temperature of the entire water sample after all the ice is melted (report your answer to three

How many atoms are in KNO3?

If 4.20 mol of ethane, C2H6, undergo combustion according to the unbalanced equation given below, how many moles of oxygen are required?

The complete ionic equation for the reaction of aqueous sodium hydroxide with aqueous nitric acid is

The last column of the periodic table contains the noble gases, elements that do not easily form chemical bonds.

When pollution is removed from the air by a natural process, it

What atomic property is different in each isotope of an element?

How do carbon-12 and carbon-13 differ? Select all that apply. They have different amounts of neutrons. They have different atomic charges. They have different mass numbers. They have different amounts of electrons.

Why arent the jaguars and sloths growing and thriving?