Chemistry, 24.06.2019 20:30 kaylienguyen

Which of the following is a double replacement reaction? ca(oh)2 + h2so4 → caso4 + 2h2o ch4 + 2o2 → co2 + 2h2o 8fe + s8 → 8fes zn + h2so4 → znso4 + h2

Answers: 1

Show answers

Answers

Answer from: shemiahking5432

That would be the first option Ca(OH)2 + H2SO4 → CaSO4 + 2H2O.

The Ca replaces the H2 in H2SO4, and the H2 replaces the Ca is Ca(OH)2.

Answer from: hokamidat

Option (a) is the correct answer.

Explanation:

A chemical reaction in which there occurs exchange of two ions between two different compounds is known as a double replacement reaction.

For example, $Ca(OH)_{2} + H_{2}SO_{4} \rightarrow CaSO_{4} + 2H_{2}O$

Here, $OH^{-}$ ions of $CaOH_{2}$ is replaced by $SO^{21}_{4}$ ions of sulfuric acid and $SO_{4}$ of sulfuric acid is replaced by $OH^{-}$ ions of $CaOH_{2}$ .

When two atoms combine together to form a compound then it is known as synthesis reaction.

When a compound reacts with oxygen to give carbondioxide and water then it is known as combustion reaction.

When a metal is treated with an acid to yield hydrogen gas then it is known as single replacement reaction.

Therefore, we can conclude that $Ca(OH)_{2} + H_{2}SO_{4} \rightarrow CaSO_{4} + 2H_{2}O$ is a double replacement reaction.

Answer from: Quest

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

Answer from: Quest

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

Another question on Chemistry

Chemistry, 22.06.2019 00:00

Newtons second law deals most cosely with

Answers: 1

Answer

Chemistry, 22.06.2019 11:40

Effect of rotenone and antimycin a on electron transfer rotenone, a toxic natural product from plants, strongly inhibits nadh dehydrogenase of insect and fish mitochondria. antimycin a, a toxic antibiotic, strongly inhibits the oxidation of ubiquinol. (a) explain why rotenone ingestion is lethal to some insect and fish species. (b) explain why antimycin a is a poison. (c) given that rotenone and antimycin a are equally effective in blocking their respective sites in the electron-transfer chain, which would be a more potent poison? explain.

Answers: 3

Answer

Chemistry, 23.06.2019 00:30

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices

Answers: 3

Answer

Chemistry, 23.06.2019 01:00

The most common form of matter in the universe

Answers: 2

Answer

You know the right answer?

Which of the following is a double replacement reaction? ca(oh)2 + h2so4 → caso4 + 2h2o ch4 + 2o2 →...

Questions