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3 years ago

1. Write chemical reaction of burning of magnesium

Chemistry

1 answer:

shtirl [24]3 years ago

4 0

Answer:

1.Mg+O2.......MgO2

Explanation:

2.Very reactive towards halogens and reacts with water at room temperature. 3, Magnesium oxide is a simple basic oxide. 4.It will react with water to form magnesium hydroxide which is a base turning red litmus to blue 5.should be white. hope it helped. I help people although when I post a question it is left unanswered and then gets answers after two days when I don't really need it

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Ostrovityanka [42]

Answer:sorry

Explanation:

3 0

3 years ago

A 225 g sample of french fries supplies 460 kilocalories of energy. 65% of those calories come from fat, which supplies 9 kiloca

brilliants [131]

The french fries gives 460 kilocalories and 65% of those calories come from fat. Then, calorie that comes from fat would be: 65% * 460 kcal= 299 kcal

Fat gives energy about 9kcal/gram. Then, the total mass of fat in the french fries would be: 299 kcal/ (9kcal/g)= 33.22 grams

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4 years ago

Read 2 more answers

You need a 30% alcohol solution. On hand, you have a 200 mL of a 10% alcohol mixture. You also have 55% alcohol mixture. How muc

Art [367]

Answer: 160 ml

Explanation:

The expression used will be :

$C_1V_1+C_2V_2=C_3V_3$

where,

$C_1$ = concentration of Ist alcohol solution= 10%

$C_2$ = concentration of 2nd alcohol solution= 55%

$V_1$ = volume of Ist alcohol solution = 200 ml

$V_2$ = volume of 2nd alcohol solution= v ml

$C_3$ = concentration of resulting alcohol solution= 30%

$V_2$ = volume of resulting alcohol solution= (v+200) ml

Now put all the given values in the above law, we get the volume of added.

$(10\times 200)+(55\times v)=(30\times (v+200)ml)$

By solving the terms, we get :

$v=160ml$

Therefore, the volume of 55% mixture needed to be added to obtain the desired solution is 160 ml.

5 0

3 years ago

Identify and label the Brønsted-Lowry acid, its conjugate base, the Brønsted-Lowry base, and its conjugate acid in each of the f

julia-pushkina [17]

Explanation:

As per Brønsted-Lowry concept of acids and bases, chemical species which donate proton are called Brønsted-Lowry acids.

The chemical species which accept proton are called Brønsted-Lowry base.

(a) $HNO_3 + H_2O \rightarrow H_3O^+ + NO_3^-$

$HNO_3$ is Bronsted lowry acid and $NO_3^-$ is its conjugate base.

$H_2O$ is Bronsted lowry base and $H_3O^+$ is its conjugate acid.

(b)

$CN^- + H_2O \rightarrow HCN + OH^-$

$CN^-$ is Bronsted lowry base and HCN is its conjugate acid.

$H_2O$ is Bronsted lowry acid and $OH^-$ is its conjugate base.

(c)

$H_2SO_4 + Cl^- \rightarrow HCl + HSO_4^-$

$H_2SO_4$ is Bronsted lowry acid and $HSO_4^-$ is its conjugate base.

Cl^- is Bronsted lowry base and HCl is its conjugate acid.

(d)

$HSO_4^-+OH^- \rightarrow SO_4^{2-}+H_2O$

$HSO_4^-$ is Bronsted lowry acid and $SO_4^{2-}$ is its conjugate base.

OH^- is Bronsted lowry base and $H_2O$ is its conjugate acid.

(e)

$O_{2-}+H_2O \rightarrow 2OH^-$

$O_{2-}$ is Bronsted lowry base and OH- is its conjugate acid.

$H_2O$ is Bronsted lowry acid and OH- is its conjugate base.

6 0

4 years ago

How many grams of NaCl are required to make 150.0mL of a 5.000 m solution

Yanka [14]

The number of grams of NaCl required to make 150.0 ml of a 5.000m solution is 43.875 grams

calculation

Step 1: calculate moles of NaCl

moles= molarity x volume in liters

volume in liters = 150.0 ml/1000= 0.15 l

moles is= 5.000mol/l x0.15 l =0.75 moles

Step2 : find mass

mass= moles x molar mass

molar mass of NaCl= 23 +35.5 = 58.5 g/mol

mass= 0.75 moles x58.5 g/mol = 43.875 grams

6 0

4 years ago