Answers: 1
Chemistry, 22.06.2019 09:30
Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?
Answers: 3
Chemistry, 22.06.2019 09:50
Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange
Answers: 1
Chemistry, 22.06.2019 10:00
Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.
Answers: 1
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
13. A container of methane (CH) contains 128.336 g of gas. The volume of the container is 4.800L,...
Mathematics, 02.02.2021 18:30
Mathematics, 02.02.2021 18:30
Mathematics, 02.02.2021 18:30
Mathematics, 02.02.2021 18:30
Biology, 02.02.2021 18:30
Advanced Placement (AP), 02.02.2021 18:30
Chemistry, 02.02.2021 18:30
Mathematics, 02.02.2021 18:30
Arts, 02.02.2021 18:30
Mathematics, 02.02.2021 18:30
Mathematics, 02.02.2021 18:30
English, 02.02.2021 18:30