The average atomic mass of a sample of an element X is 16.2u. What are the percentages of isotopes X (mass number 16, atomic number 8) and X (mass number 16, atomic number 8) in the sample?

What is the name of the compound Si5F7? A. Pentasilicon hexafluoride B. Sulfur fluoride C. Pentasilicon heptafluoride D. Silicon fluoride

What does burning bread in a toaster demonstrate? (a) Energy can create a change. (b) Energy can cause motion. (c) A toaster creates its own energy. (d) A toaster is needed to burn bread.

Lab report on calorimetry and specific heat

A girl pulls on a 10-kg wagon with a constant force of 20 N. whats is the wagon's acceleration?

All of the following are a source of carbon in the carbon cycle except: Sunlight Sediment Animals Fossil Fuels

The data below were collected for the following reaction at 500 ∘C: CH3CN (g) →CH3NC (g) Time (h) [CH3CN] (M) 0.0 1.000 5.0 0.794 10.0 0.631 15.0 0.501 20.0 0.398 25.0 0.

How do i convert 3.00 moles H2 to molecules?

How can you use the chemical formulas for sucrose (C6H, 20,) and rust (Fe, O,) to classity them ionic or molecular compounds?

What is true of energy as is passes through an ecosystem? a. All of the energy in an organism is used by the animal that eats it. b. Any stored energy in an organism is used by the animal that eats it. c.

Which can associate a suspect and the firing of a gun? (its not b) A) markings on the gun's exterior B) markings on the casing C) markings on the bullet D) powder residues