Describe one technology used to travel to space and one technology used to return from space

How many grams are in 6.78 x 10^24 atoms of He?

Select the correct value for the indicated bond angle in each of the compounds. O-O-OO-O-O angle of O3 90° 109.5° <109.5° 120° <120° 180° F-B-FF-B-F angle of BF3 180° <109.5° <120° 120° 109.5° 90° F-O-FF-O-F angle of OF2 <120° 120° 90° 109.

Hannah just finished building a house of cards that stands four stories high. She is worried that it will fall down. Which of the following statements must be true? A. A house of cards is too fragile and must fall down eventually due to gravity. B.

The element rubidium has two naturally occurring isotopes. The atomic mass of 85Rb (72.17 percent abundant) is 84.911794 amu. Determine the atomic mass of 87Rb (27.83 percent abundant). The average atomic mass of Rb is 85.4678 amu.

25.00 ml of heavy water at 20 degrees celcius was pipetted into a 37.234 g beaker. The final mass of the beaker was 64.859 g. What was the density of the water at 20 degrees celcius?

If you walk toward a Van der Graaff generator, the effect of its electric field would get weaker as you got closer to it, true or false.

The volume of a single nickel atom is 8.10*10-24 cm3. what is the volume of a nickel atom in microliters?

A college student driving to classes produces 8000 kg of carbon dioxide (CO2) in a year, contributing to global warming. What volume of CO2 is produced? (The density of carbon dioxide is 2.0 g/L.)

For the first five steps of glycolysis, the appropriate sequence of enzymes is: A. phosphofructokinase-1 (PFK-1). B. hexokinase / glucokinase. C. fructose bisphosphate aldolase. D. Phosphoglucoisomerase. E. triose phosphate isomerase (TPI). a.

2NO + O2 → 2NO2 What type of chemical reaction is shown above? a combustion reaction b double displacement C synthesis d decomposition e single displacement