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3 years ago

A 72 g sample contains how many moles of water? (include appropriate sig figs in your answer)

Chemistry

1 answer:

sammy [17]3 years ago

5 0

Answer:

Explanation:

yhhh&hhhhhhhhhhhhhhh

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Which of the following most likely happens when thermal energy is removed from a chemical reaction?

labwork [276]

Answer:

fewer collisions occur between particles or lowering the temperature

Explanation:

7 0

3 years ago

Which molecule, when added to a solution, would give the solution the highest pH

kondor19780726 [428]

Potassium Hydroxide (KOH) when added to the solution would give the highest pH

Explanation:

Bases or Alkali are associated with high pH while Acidic substances are represented by lower pH value.

In the given option

HCl- is a strong acid hence would have pH less than 7

H2SO4- also an acid with a pH less than 7

KOH- base with a pH higher than 7

H20-neutral compound with pH as 7

KOH is a very strong base and dissociates in aqueous solution to give it's corresponding metallic ion and hydroxyl ions (OH-) which are characteristic property of any base.

4 0

3 years ago

If the prescribed dosage of milk of magnesia Mg(OH)2 is 3.5 moles, how many grams

OlgaM077 [116]

Answer:

Explanation:

1 mole is equal to 58.31968 grams.

so 3.5 moles equal to answer choice B

3 0

3 years ago

. The net ionic equation for the reaction that occurs during the titration of nitrous acid with sodium hydroxide is (a) HNO2 Na

hjlf

Answer:

$H^+_{(aq)}+OH^{-}_{(aq)}\rightarrow H_2O_{(l)}$

Explanation:

Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.

Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations.

Only the species which are present in aqueous state dissociate.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

(a)

The balanced molecular equation will be,

$HNO_2_{(aq)}+NaOH_{(aq)}\rightarrow H_2O_{(l)}+NaNO_2_{(aq)}$

The complete ionic equation in separated aqueous solution will be,

$H^+_{(aq)}+NO_2^-_{(aq)}+Na^+_{(aq)}+OH^{-}_{(aq)}\rightarrow H_2O_{(l)}+Na^+_{(aq)}+NO_2^-_{(aq)}$

In this equation the species present are, $Na^+\text{ and }NO_2^-$ are the spectator ions.

Hence, the net ionic equation contains specie is

$H^+_{(aq)}+OH^{-}_{(aq)}\rightarrow H_2O_{(l)}$

6 0

3 years ago

Is crushing a rock a chemical or physical change?

aalyn [17]

Physical change because you didn't change the chemical compound

4 0

3 years ago