What is the density of an 84.7 g sample of an unknown substance if the sample occupies 49.6cm cubed

Part a the sun produces energy via fusion. one of the fusion reactions that occurs in the sun is 411h→42he+201e how much energy in joules is released by the fusion of 2.

A 1.00 L buffer solution is 0.150 M in HC7H5O2 and 0.250 M in LiC7H5O2. Calculate the pH of the solution after the addition of 100.0 mL of 1.00 M HCl. The Ka for HC7H5O2 is 6.5 * 10-5. A 1.00 L buffer solution is 0.150 M in HC7H5O2 and 0.

Sensory neurons do what job?

For the nitrogen fixation reaction, 3h2 (g) + n2 (g) 2nh3 (g), kc = 6.0 * 10-2 at 500°c. if 0.250 m h2 and 0.050 m nh3 are present at equilibrium, what is the equilibrium concentration of n2? a. 3.3 m b. 2.7 m c. 0.20 m d. 0.083 m e. 0.058 m

Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen - and phosphorus-enhanced fertilizers?

Which statement is true for a pure compound but NOT true for a pure element?

Which one is uncelluar and which is multicelluar? crab or pond organism

An atom of lithium loses an electron. What is the effect of this event? Group of answer choices The atom of a different element is formed. The atom of lithium acquires no charge. The atom of lithium becomes a positively charged ion.

Water interacts with polar substances like - OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2). Using this information, select the molecules that will easily dissolve in water based on polarity not on size.

Which of the following statements is not considered weather? The wind is blowing 20 miles per hour right now in Kansas. It is raining in Seattle. It is usually humid in Florida. It is snowing in Colorado.