Earth's core is made mostly of

A. silicon and oxygen.

B. iron and nickel.

C. silicon and magnesium.

D. iron and magnesium.

How does chemistry contribute to energy research

Which of the following substance is not an acid? Substance A is tested and found to have a pH of 3. Substance B, a common food, tastes sour. Substance C causes metals to corrode. Substance D feels slippery in solution.

Acid and an alkali combined together will give a salt, if they are mixed in the right amount 1) What is the name given to this reaction

A naturally occurring sample of an element contains only two isotopes. The first isotope has a mass of 68.9255 amu and a natural abundance of 60.11%. The second isotope has a mass of 70.9247 amu. Find the atomic mass of the element.

Where are the most active metais located?

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

Which of the following locations would most likely have the most fertile soul?