Looking at the periodic table, which pair of elements will have the same number of valence electrons? A. silicon and germanium B. nitrogen and oxygen C. silicon and phosphorus D. hydrogen and helium

2. A volume is measured experimentally as 4.26 mL. What is the percentage error, given that the correct value is 4.15 mL? Measurements and Calculation

Many chemical symbols represent the Latin names of the elements. True or False

Food is important for growing and repairing tissues in the body. By which process is food broken down into nutrient molecules? A.) respiration B.) digestion C.) elimination D.) perspiration

What is percipitation

What happens to the particles on a dissolving process?

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?