How do atomic mass and atomic number change across and dow the periodic table of elements?

What Type of Reaction is the following: Cu2 (Cr2O7) + Fe (PO4) → Cu3 (PO4) + Fe2 (Cr2O7) 3 1. Synthesis 2. Decomposition 3. Single Replacement 4. Double Replacement

What is the percent by mass of chlorine in NaCl? 35.45% 39.34% 60.66% 70.90%

In a laboratory experiment, the reaction of 3.0 mol of H2 with 2.0 mol of I2 produced 1.0 mol of HI. Determine the theoretical yield in grams and the percent yield for this reaction.

How many moles of solute particles are present in 100.0 ml of 2.50 m (nh4) 3po4?

The half-life of hydrogen-3 (tritium) is approximately 12 years. In how many years will half of a 20-gram sample decay by beta radiation to helium-3? 6 12 10 20

Zn (s) + cu2 + (aq) →zn2 + (aq) + cu (s). part a under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 51.0 g of copper is plated out?

13 This word describes the circulatory system that provides nutrients and oxygen to living cells of the body.

Write the outer electron configuration for the group 15 element in the fourth period.

Describe the relationship between transmittance and the absorbance?

Are the following statements true or false? A. Two pi bonds comprise a double bond. B. Bonds formed from atomic p orbitals are always sigma bonds. C. Side-to-side overlap results in a bond with electron density above and below the bond axis. D.