Between Br, F, S, As which has the most electronegativity?

Which correctly summarizes the trend in electron affinity? it tends to be very high for group 2. it tends to be more negative across a period. it tends to remain the same across periods. it tends to be more negative down a group?

How can separate the mixture of sugar and salt

What is the mass of 19.5 moles of carbon dioxide?

What conditions were necessary for Africa and South America to move apart?

The atomic mass of Aluminum is 26.98154 g/mol. Is it possible to have 5.0*10-25g of Al

If a simple gas is collected over water. The atmospheric pressure is 778 mm and the temperature is 30°C. If the vapor pressure of water at 30 C is 31.8 mm, what is the pressure of the gas?

Select all correct answers. In the cathode ray tube experiment, J. J. Thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field.

if 5.50 mol of calcium carbide (CaC 2) reacts with an excess of water, how many moles of acetylene (C 2 H 2), a gas used in welding, will be produced? CaC2 (s) + 2H2O (l) Ca (OH) 2 (aq) + C2H2 (g)

Jamal was riding his bike home at a speed of 12 mph. On his trip out, he had travled. 8 miles away from his house. He has been travleing for a half hour at this speed

3. Which means of particle transport requires input of energy from the cell? diffusion osmosis facilitated diffusion active transport