In the chemical formula 3nh4, how many total atoms of hydrogen (h) are there? 1 4 12

5. The air rising cools as it reaches the top of which atmospheric layer? Troposphere Metrosphere Thermsphere none of the above

The atomic number of an element is always the same as ___ A. The number of electrons B. The number of protons C. The number of neutrons D. The number of protons plus neutrons

Which of the following results when iron and oxygen react? 1. fe2o3 corrodes 2. hydrated iron forms 3. iron oxide forms 4. a shiny metal forms 5. o2 dissolves in water

How does changing the size and number of objects in a collision affect a collision

What process coverts hydrogen to helium to create energy in the sun?

A banana split contains 1.12 million calories. What is the energy value in kilojoules? a. 1.12 kJ b. 4.686 x 10^3 kJ c. 4686 kJ d. 2.68 x 10^5 kJ e. 268 kJ

2 grams of a substance was dissolved in 75.0 g of water resulting in a temperature decrease from 23.1 ⁰C to 18.7 ⁰C. The specific heat of the solution is 4.18 J/g·⁰C. Calculate the amount of heat associated with the water.

Why do you think the soccer ball fell more slowly than the golf ball

Which of the following is an example of chemistry research in the main area of energy?. a. producing bioplastics. b. specific reactions between prescription drugs and chemicals in cells. c. developing rechargeable batteries. d.

A gas is sealed in a bottle at 25°C and 1.50 atm pressure. How must the storage conditions be changed to bring the gas to Standard Temperature and Pressure (STP) ? A. Increase the temperature by 25°C and decrease the pressure by 0.514 atm. B.