Which sample is a pure substance?

(A) a test tube of zinc oxide

(B) a container of zinc and oxygen

(C) flask of pond water

(D) a jar of soil

If a compound contains 8.1 g of nickel and 2.29 g of oxygen, what is the mass percent of nickel in the compound

If most objects are made up of free space then why can we put our hands through a book or wall?

26. Why did Mendeleev leave spaces in his periodic table?

An operator is a segment of dna that acts as an on off swicth for translation? true or false

If you had to draw a covalent bond between two atoms, which items would you need to include? A. the ions in each atom B. electrons shared between atoms C. the chemical symbols of the atoms D. the protons in each atom

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Identify and briefly describe two ecosystems in your community that are beyond schoolyard

Is N2H2 a ionic compound?

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.