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2 years ago

What chemical change occurred in the following reaction? Mg2+(aq)+2OH−(aq)⟶ Mg(OH)2(s)

Chemistry

2 answers:

irina1246 [14]2 years ago

6 0

I think it might be a gas was formed.
Hope I'm right and it helps you out!!

7nadin3 [17]2 years ago

3 0

Answer : When magnesium salts combine with the alkaline water it induces precipitation of solid $Mg(OH)_2$ .

Explanation :

Chemical change : The chemical change occurs when a substance combine with the another substance to form a new substance.

It can not be easily reversible.

The new product is formed or precipitate may be formed.

Physical change : The physical change occurs when a substance combine with the another substance then no new compound is formed.

It can be reversible.

No new product is formed only changes occurs in the state or phase.

As per question, when magnesium salts combine with the alkaline water it induces precipitation of solid $Mg(OH)_2$ .

The balanced chemical reaction is,

$Mg^{2+}(aq)+2OH^-(aq)\rightarrow Mg(OH)_2(s)$

That mean a new compound is formed by this reaction. So, the chemical change occurred in this reaction.

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Please answer asap!

kaheart [24]

200 ml is 1/5 of a liter, so the answer is five times the number of moles present in the solution. 0.6 moles/0.2 liter = x moles/1.0 liter. Solving for x gives 0.2 x = 0.6 or x = 3.0 M

so the answer is c

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2 years ago

The maximum amount of solute that dissolves in a given amount of solvent and forms a stable solution is called the

denis23 [38]

Answer:

The maximum amount of solute that dissolves in a given amount of solvent and forms a stable solution is called the solubility of the solute

Explanation:

The maximum amount of solute that could be dissolved in a given amount of solvent is the solubility of the solute. It is the saturated solution's concentration from where a saturated solution can be defined as the one which already contains the maximum quantity of dissolved solute at a specified temperature, while an unsaturated solution is one with a capacity to dissolve more solutes

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2 years ago

A 19.0 g piece of metal is heated to 99.0 °C and then placed in 150 mL of water at 21°C. The temperature of the water rose to 23

Anna35 [415]

Answer:

$0.8696\ \text{J/g}^{\circ}\text{C}$

Explanation:

$m_m$ = Mass of metal = 19 g

$c_m$ = Specific heat of the metal

$\Delta T_m$ = Temperature difference of the metal = $99-23=76^{\circ}\text{C}$

V = Volume of water = 150 mL = $150\ \text{cm}^3$

$\rho$ = Density of water = $1\ \text{g/cm}^3$

$c_w$ = Specific heat of the water = 4.186 J/g°C

$\Delta T_w$ = Temperature difference of the water = $23-21=2^{\circ}\text{C}$

Mass of water

$m_w= \rho V\\\Rightarrow m_w=1\times 150\\\Rightarrow m_w=150\ \text{g}$

Heat lost will be equal to the heat gained so we get

$m_mc_m\Delta T_m=m_wc_w\Delta T_w\\\Rightarrow c_m=\dfrac{m_wc_w\Delta T_w}{m_m\Delta T_m}\\\Rightarrow c_m=\dfrac{150\times 4.186\times 2}{19\times 76}\\\Rightarrow c_m=0.8696\ \text{J/g}^{\circ}\text{C}$

The specific heat of the metal is $0.8696\ \text{J/g}^{\circ}\text{C}$ .

4 0

2 years ago

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion. B. If both Assertion &amp

Neporo4naja [7]

Answer:

C. If Assertion is true statement but Reason is false.

Explanation:

The burning of magnesium in air produces magnesium oxide as shown by the equation;

2Mg(s) + O2(g) -----> 2MgO(s)

The magnesium oxide solid is recovered as a white ash. This is a typical example of an oxidation reaction which is also a combustion reaction.

The reason has nothing at all to do with the assertion hence the answer given.

Magnesium oxide is basic just like the oxides of other metals and dissolves in water to yield an alkali.

8 0

2 years ago

Read 2 more answers

What is the most likely reason a computer model is used for a black hole?

Rashid [163]

Answer:

Black holes are merely the most exotic example of the general principle that ... quantum computer stores bits on protons and uses magnetic fields to flip them. ... Powered by Standard Model software, the universe computes

Explanation:because they are mostly exotic

6 0

2 years ago