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3 years ago

If a substance reacts with oxygen, the chemical reaction is most likely a what?

Chemistry

2 answers:

Evgesh-ka [11]3 years ago

4 0

This is an redox reaction, a combustion reaction.
For example:

4Al + 3O₂ = 2Al₂O₃
Al - 3e⁻ = Al⁺³
O₂ + 4e⁻ = 2O⁻²

irga5000 [103]3 years ago

3 0

The answer would be a combustion reaction

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Which of the following coefficients are needed to balance the combustion reaction of ethanol?

djyliett [7]

Answer is: d. 3,2,3.

Balanced chemical reaction: CH₃CH₂OH + 3O₂ → 2CO₂ + 3H₂O.
CH₃CH₂OH is ethanol.
O₂ is molecule of oxygen.
CO₂ is carbon(IV) oxide.
H₂O is water.
There are same number of atoms (oxygen, carbon and hydrogen) on both side of balanced chemical reaction:
2 atoms of carbon.
6 atoms of hydrogen.
7 atoms of oxygen.

5 0

3 years ago

A student mixes in a test tube 3.00mL of 0.050M CuSO4with 7.00mL of 0.20M NH3/NH41 . The solution becomes a deep blue color. Ass

valkas [14]

Answer:

$\large \boxed{\text{0.0035 mol/L}}$

Explanation:

We are given the volumes and concentrations of two reactants, so this is a limiting reactant problem.

We know that we will need moles, so, lets assemble all the data in one place.

Cu²⁺ + 4NH₃ ⟶ Cu(NH₃)₄²⁺

V/mL: 3.00 7.00

c/mol·L⁻¹: 0.050 0.20

1. Identify the limiting reactant

(a) Calculate the moles of each reactant

$\text{Moles of Cu}^{2+}= \text{3.00 mL solution} \times \dfrac{\text{0.050 mmol Cu}^{2+}}{\text{1 mL solution}} = \text{0.150 mmol Cu}^{2+}\\\\\text{Moles of NH}_{3} = \text{7.00 mL solution} \times \dfrac{\text{0.20 mmol NH}_{3}}{\text{1 mL solution}} = \text{0.140 mmol NH}_{3}$

(b) Calculate the moles of Cu(NH₃)₄²⁺ that can be formed from each reactant

(i) From Cu²⁺

$\text{Moles of Cu(NH$_{3}$)$_{4}$$^{2+}$} = \text{0.150 mmol Cu}^{2+} \times \dfrac{\text{1 mmol Cu(NH$_{3}$)$_{4}$$^{2+}$}}{\text{1 mmol Cu}^{2+}}\\\\= \text{0.150 mmol Cu(NH$_{3}$)$_{4}$$^{2+}$}$

(ii) From NH₃

$\text{Moles of Cu(NH$_{3}$)$_{4}$$^{2+}$} = \text{0.140 mmol NH}_{3} \times \dfrac{\text{1 mmol Cu(NH$_{3}$)$_{4}$$^{2+}$}}{\text{4 mmol NH}_{3}}\\\\= \text{0.0350 mmol Cu(NH$_{3}$)$_{4}$$^{2+}$}$

NH₃ is the limiting reactant, because it forms fewer moles of the complex ion.

(c) Concentration of the complex ion

$\text{The reaction forms 0.0350 mmol Cu(NH$_{3}$)$_{4}$$^{2+}$ in a total volume of 10.00 mL.}\\c = \dfrac{\text{moles}}{\text{litres}} = \dfrac{\text{0.0350 mmol}}{\text{10.00 mL}} = \textbf{0.0035 mol/L}\\\\\text{The concentration of the complex ion is $\large \boxed{\textbf{0.0035 mol/L}}$}$

7 0

3 years ago

NEED HELP, HURRY PLS Create a superhero out of the element iron, what are its powers and his sidekick ( an element that works we

laila [671]

Answer:

How about......................IRON MAN

Explanation:

3 0

4 years ago

How does the vapor pressure of water at 10°C compared with its vapor pressure at 50°C ?

Sliva [168]

Answer: The vapor pressure of water at 10°C will be less as compared with its vapor pressure at 50°C.

Explanation:

Vapor pressure of a liquid is defined as the pressure exerted by the vapors in equilibrium with the liquid/solution at a particular temperature.

As Kinetic energy is dependent on the absolute temperature of the gas.

$K.E=\frac{3}{2}RT$

where R = gas constant

T = temperature

On increase in temperature, the kinetic energy of the molecules increase and thus more liquid molecules can escape to form vapours and thus will exert more vapor pressure.

Thus the vapor pressure of water at 10°C will be less as compared with its vapor pressure at 50°C.

4 0

3 years ago

A chemist has one solution that is 25% salt and 75% water and another solution that is only 5% salt. how many milliliters of eac

Arte-miy333 [17]

The formula that we will be using is:

total salt / total solution = .10
Let a be the ml of the first solution

And let b be the ml of the second solution
.25a + .05b / a + b = .10
Also:

a + b = 1400

a = 1400 - b
So substitute:
.25 x (1400 - b) + .05b / 1400 = .10

350 - .25b + 0.05b/ 1400 = .10

350 - .2b / 1400 = .10
350 - .2b = .10 x 1400

.2b = 350 - 140

.2b = 210

b = 1050

a = 1400 - b

a = 1400 - 1050

= 350 mL

3 0

3 years ago