Which of the following best describes the general properties of elements found to the left of the metalloids on the periodic table? 

In a chemical reaction, 18.0 grams of hydrogen peroxide decompose into 16.0 grams of water and oxygen gas. What mass of oxygen gas is produced?

An ion of sulfur has 16 protons, 18 electrons, and a mass number of 34. Which of the following statements is correct? 

An unknown Element X has two naturally occurring isotopes:X-62 (mass = 62.0 amu)X-64 (mass = 62.0 amu)The average atomic mass is 62.8 amu. What is the percent abundance of each isotope? Round each percent to the nearest whole number or tenth as appropriate. 

Which of the following is the correct chemical formula for dinitrogen pentoxide?

The element carbon (C) has two common isotopes. 98.89% of carbon atoms have 6 neutrons and 6 protons, while 1.11% of carbon atoms have 7 neutrons and 6 protons. Based on this information, what is the average atomic mass of carbon? Round your answer to the tenths place.

Decide whether or not the ordered pair satisfies the system of linear equations.(-2, 4);

Use the power rule and the power of a product or quotient rule to simplify the expression.(-2a)4

Solve.|x – 8| = 6

Find the slope of the line.4x + y = 9