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Igoryamba
3 years ago
14

Select the classification for the following reaction. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) a. precipitation b. acid-base c. redo

x d. combination e. none of the above
Chemistry
1 answer:
Alexeev081 [22]3 years ago
8 0

Answer:

The answer to your question: I think is letter c

Explanation:

                       2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

a.- Precipitation: is incorrect because for this kind of reactions one of the products  must be a precipitate and in the reaction we see that NAOH is soluble in water (aq) and H2 is a gas, none of them precipitate.

b. acid - base: the reactants must be an acid and a base, and the reactants of this reaction has a base but it's in the products.

c. Redox: This reaction is a redox reaction because for this reaction the oxidation numbers of the reactants must change and this happen in this reaction (H changes from +1 to 0) and Na changes from 0 to +1.

d. Combination. In this reaction the reactants combine to form a new compound and this doesn't happen here.

e. None of the above. is false because letter C is correct.

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Define the term macromolecule
makkiz [27]

Explanation:

a molecule containing a very large number of atoms, such as a protein, nucleic acid, or synthetic polymer.

4 0
3 years ago
In recrystallization from boiling water of benzoic acid contaminated with acetanilide, you begin with an impure sample of 5 gram
kherson [118]

This question is incomplete, the complete question is;

In recrystallization from boiling water of benzoic acid contaminated with acetanilide, you begin with an impure sample of 5 grams. If the % composition of the acetanilide impurity in the sample is 6.3 %, what is the minimum amount in mL of solvent (water) required for the recrystallization

Compound      Solubility in water at 25°C      Solubility in water at 100°C

Benzoic Acid      0.34 g/100mL                           5.6 g/100mL

Acetanilide         0.53 g/100mL                           5.5 g/100mL

Answer:

The minimum amount in mL of solvent (water) required for the recrystallization is 91 mL

Explanation:

Given the data in the question;

mass of sample = 5 g

percentage composition of the acetanilide impurity = 6.3%

mass of the acetanilide in impure sample will be;

⇒ 6.3% × 5 g = 0.315 g

Mass of benzoic acid in impure sample;

⇒ 5 g - 0.315 g = 4.685 g

now, solubility in water at 100°C for benzoic acid = 5.6 g/100mL

hence 4.685 g of benzoic acid is soluble in x mL

x = [ 100 mL × 4.685 g ] / 5.6 g

x = 83.66 ≈ 84 mL

Also, solubility in water at 100°C for acetanilide = 5.5 g/100mL

hence 0.315 g of benzoic acid is soluble in x mL

x = [ 100 mL × 0.315 g ] / 5.5 g

x = 5.727 ≈ 6 mL

So, the minimum amount in mL of solvent (water) required for the recrystallization will be;

⇒ 85 mL + 6 mL = 91 mL

The minimum amount in mL of solvent (water) required for the recrystallization is 91 mL

5 0
3 years ago
Rank the following by their miscibility in
tatuchka [14]

Answer:

<h2>2. H2O < CH3OH < CH3CH2OH < C9H20</h2>

Explanation:

Decane is a hydrocarbon so it is a non-polar molecule. Non-polar molecules are soluble in non-polar molecules and polar molecules are soluble in polar molecules. Water is a polar molecule so it is least soluble in decane molecule and C_{9}H_{20} is a non-polar molecule so it is most soluble in decane molecule. Methanol and ethanol are the derivatives of hydrocarbon so they have more solubility than water but less solubility than nonane molecules.

6 0
3 years ago
The density of titanium metal is 4.51 g/cm3 at 25 ∘C What mass of titanium displaces 68.6 mL of water at 25 ∘C∘C?
goblinko [34]

Answer:

The mass of titanium displaces 68.6 mL of water is 309.4 g.

Explanation:

Given that:-

\rho=4.51\ g/cm^3

V=68.6\ mL

Also, 1 cm^3  = 1 mL

So, V=68.6\ cm^3

The expression for the calculation of density is shown below as:-

\rho=\frac{m}{V}

Using the above expression to calculate the mass as:-

m={\rho}\times V

Applying the values to calculate the mass as:-

m=4.51\ g/cm^3\times 68.6\ cm^3=309.4\ g

<u>The mass of titanium displaces 68.6 mL of water is 309.4 g.</u>

5 0
3 years ago
For the chemical equation SO 2 ( g ) + NO 2 ( g ) − ⇀ ↽ − SO 3 ( g ) + NO ( g ) the equilibrium constant at a certain temperatur
Ipatiy [6.2K]

Answer : The number of moles of NO_2 gas added must be, 1.59 moles.

Explanation :

Equilibrium constant : It is defined as the equilibrium constant. It is defined as the ratio of concentration of products to the concentration of reactants.

The equilibrium expression for the reaction is determined by multiplying the concentrations of products and divided by the concentrations of the reactants and each concentration is raised to the power that is equal to the coefficient in the balanced reaction.

The given equilibrium reaction is,

                        SO_2(g)+NO_2(g)\rightleftharpoons SO_3(g)+NO(g)

Initial conc.    2.86               x             0          0

At eqm.       (2.86-1.30)    (x-1.30)     1.30     1.30

The expression of K_{eq} will be,

K_{eq}=\frac{[SO_3][NO]}{[SO_2]NO_2]}

Now put all the given values in this expression, we get:

3.70=\frac{(1.30)\times (1.30)}{(2.86-1.30)\times (x-1.30)}

x=1.59

Thus, the number of moles of NO_2 gas added must be, 1.59 moles.

4 0
3 years ago
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