Give the number of significant figure in this number 2.115

What is the pOH if the ph=9.7

An electron in a hydrogen atom relaxes to the n=4 level, emitting light of 74 THz.

Give 3 examples of mixtures and tell whether each one is homogeneous or heterogeneous give three examples of compounds

During chemistry lab, Maria places sucrose in a glass beaker, adds water, and stirs. As the table sugar disappears, she loudly proclaims that she has chemically broken down the sucrose into fructose and glucose.

Which one of the following solutions will have the greatest concentration of hydroxide ions? a) 0.100 M hydrochloric acid b) 0.100 M magnesium hydroxide c) 0.100 M ammonia d) 0.300 M rubidium hydroxide e) 0.250 M calcium hydroxide

Identify the element that chlorine forms a covalent bond with

A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?

A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a calorimeter containing 57 g of water (specific heat 4.184 J/g*°C).

Which of the following is the most likely description of the product or products of a double-displacement reaction? A) one new compound B) two new compounds C) oxygen and energy D) one new compound and an element

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?