Unknown element X combines with oxygen to form the compound XO2. If 44.0 grams of element X combines with 8.00 grams of oxygen, what is the atomic mass of element X?

A. 16 amu

B. 44 amu

C. 88 amu

D. 176 amu

E. 352 amu

Explain why calcium metal after reacting with water starts floating on its surface. Write the chemical equation for this reaction. Name one more metal that starts floating after sometime then floats with water.

Indicate the number of unpaired electrons for following: [noble gas]n s 2 n p 5

If you want to change the pitch of a sound, you have to change the ___ Question 7 options: volume speed amplitude frequency

The compound nicl2 is an ionic compound. what are the ions of which it is composed?

What is the difence between high pressure and low pressure?

If a patient requires 30g/day of some medication and it comes in 500 mg tablets, how many tablets does this patient need in one day?

Describe a chemical formula give an example

Consider the reaction between barium chloride and sodium sulphate. If 25.0 mL of 0.75 M barium chloride react, how many grams of solid are produced?

Which of the following is the correct definition of nuclear energy? energy produced from the splitting of atoms energy an object has because of its motion or position energy stored in chemical bonds of molecules energy resulting from the flow of

Ethyl acetate reacts with H2, in the presence of a catalyst to yield ethyl alcohol: C4H8O2 + 2H2--> 2C2H6O. A. How many grams of ethyl alcohol are produced by reaction of 2.7 mol of ethyl acetate with H2? B.