Chemistry, 25.11.2019 16:31 lolololol21
Which process is an example of an exothermic reaction? a photosynthesis b melting ice cubes c burning sugar d converting frost to water vapor
Answers: 2
Chemistry, 21.06.2019 15:30
Is this a scientific model? use complete sentences to explain why or why not. a graphic organizer showing the water cycle
Answers: 3
Chemistry, 22.06.2019 11:00
The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.
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
Chemistry, 22.06.2019 16:00
Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules
Answers: 1
Which process is an example of an exothermic reaction? a photosynthesis b melting ice cubes c burni...
Computers and Technology, 24.08.2021 23:50
Social Studies, 24.08.2021 23:50
Mathematics, 24.08.2021 23:50
History, 25.08.2021 01:00
English, 25.08.2021 01:00
Mathematics, 25.08.2021 01:00
Physics, 25.08.2021 01:00
Biology, 25.08.2021 01:00
Mathematics, 25.08.2021 01:00
Mathematics, 25.08.2021 01:00