What is the approximate mass of a 100-N person on Earth? Question options: 1 kg 10 kg 100 kg 1,000 kg

9. Given the following reaction: 2NO (g) + O2 (g) → 2NO2 (g) How many liters of gaseous oxygen are needed to produce 4.50 L of gaseous nitrogen dioxide, if both gases are being measured at STP?

Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen? A. Hydrogen is a compound made of two or more kinds of atoms. B. Hydrogen is an element made of only one kind of atom. OC.

The rare earth elements include

A pure substance is matter that consists of matter with a composition that

Which of the following are physically properties of a penny

A certain ore is 34.4% nickel by mass. How many kilograms of this ore would need to dig up to have 30.0g of nickel?

Are the chemical reactions that take place when a battery connected endothermic or exothermic

What are 3 properties of carbon?

A (1. pathogen 2. Germ 3. Bacterium) is an agent that causes disease. All (1. bacteria 2. fungi 3. Viruses) are pathogens.

Calculate the solubility (in g/l) of calcium fluoride in water at 25°c if the ksp for caf2 is 1.5 * 10-10.