The porticos inside a ballon are experiencing increase in average

A sample of hydrogen gas was collected over water at 21ºc and 685 mmhg. the volume of the container was 7.80 l. calculate the mass of h2 (g) collected. (vapor pressure of water = 18.6 mmhg at 21c.)

Boron has an average atomic mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent.

What forensic technique is seen as reliable? Why is this? what makes this technique more reliable and accurate than other techniques?

How many atoms of carbon are in 0.425 g of ibuprofen?

Which organism has a central brain? A fish B flatworm C sponge D hydra

Give two example of compound that decompose to give off oxgyen gas

How many moles of gas are contained in a rigid, sealed, 5 L container, at 1 atm of pressure and 22 oc?

What makes up rubbing alcohol?

What are the similarities and differences between protons and neutrons

Draw a structure of glycogen with two alpha (1>4) linkages and two alpha (1>6) 3 linkages between glucose molecules What advantage does a branched structure have over a straight chain polysaccharide? b.