Chemistry, 05.02.2020 00:55 queenskyyt
1. given the reaction: ca + 2 h2o → ca(oh)2 + h2 how many moles of water are needed to react completely with 2.0 moles of ca?
a. 1.0 moles b. 2.0 moles c. 0.5 moles d. 4.0 moles
2. fe + h2so4 → feso4 + h2 is an example of
a. single displacement b. synthesis c. double displacement d. decomposition
3. hydrazine, n2h4 , and dinitrogen tetroxide, n2o4 react to form gaseous nitrogen and water. which of these represents a properly balanced equation for this reaction?
a. n2h4 +n2o4→ n2 +h2o
b. 2 n2h4 +n2o4 → 2 n2 +4 h2o
c. 2 n2h4 +n2o4 → 3 n2 +4 h2o
d. 2 n2h4 +3 n2o4 → 5 n2 +6 h2o
4. a 40% alcohol contains
a. 40 ml alcohol in 100 ml of water.
b. 40 ml alcohol in 60 ml of water.
c. 60 ml of alcohol in 100 ml of water.
d. 60 ml of alcohol in 40 ml of water.
Answers: 3
Chemistry, 21.06.2019 23:00
The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call
Answers: 1
Chemistry, 23.06.2019 05:00
110 g of water (specific heat = 4.184 j/g c) and 100 g of a metal sample (specific heat = 0.397 j/g c) are heated from 25 degrees c to 75 degrees c. which substance required more thermal energy?
Answers: 1
1. given the reaction: ca + 2 h2o → ca(oh)2 + h2 how many moles of water are needed to react comple...
Mathematics, 27.09.2019 08:30
Mathematics, 27.09.2019 08:30
Social Studies, 27.09.2019 08:30
Social Studies, 27.09.2019 08:30
Biology, 27.09.2019 08:30
Social Studies, 27.09.2019 08:30
English, 27.09.2019 08:30
Mathematics, 27.09.2019 08:30