What is the Big Bang

hich of the following is best described as a decomposition reaction? HCl + NaHCO3 → H2O + CO2 + NaCl 2Na + Cl2 → 2NaCl 2HgO → 2Hg + O2 AgNO3 + NaCl → AgCl + NaNO3

What element with 26 electrons?

What is produced by the process of meiosis? a) Cells that are exact copies of all the other daughter cells. b) Cells that are an exact copy of the parent cell. c) Cells that contain the exact number of chromosomes present in the parent cell.

Which two elements have the most similar chemical properties? (1) Be and Mg (3) Cl and Ar (2) Ca and Br (4) Na and P

A sealed vessel containg helium, chlorine and fluorine has a total pressure of 205 kpa and partial pressures of 15 kpa for chlorine and 89 kpa for fluorine. what is the pressure for helium in kpa

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda