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3 years ago

A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is an example of a(n):

Chemistry

1 answer:

yaroslaw [1]3 years ago

8 0

Answer: B) combustion reaction.

Explanation:

A) acid-base reaction: When an acid reacts with a base, to form metal salt and water, this type of reaction is Acid Base reaction.

Example: $HCl+NaOH\rightarrow NaCl+H_2O$

B) combustion reaction: When a hydrocarbon reacts with oxygen to produce carbon dioxide and water, this type of reaction is combustion reaction.

$CH_4+2O_2\rightarrow CO_2+2H_2O$

C) precipitation reaction: a reaction in which aqueous solution of two compounds on mixing react to form an insoluble compound which separate out as a solid are called precipitation reactions.

$Na_2SO_4(aq)+BaCl_2(aq)\rightarrow BaSO_4(s)+NaCl(aq)$

D) gas evolution reaction: a reaction in which one of the product is formed as a gas.

$CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$

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Hey guys girls ppls anyone wanna talk....

Soloha48 [4]

Yes we can talk :))

other than that have a good day!

5 0

3 years ago

Read 2 more answers

Making the simplistic assumption that the dissolved NaCl(s) does not affect the volume of the solvent water, determine the const

shtirl [24]

Answer:

m = 1,000/58.5
b = - 1,000 / 58.5

1) Variables

molarity: M
density of the solution: d
moles of NaCl: n₁
mass of NaCl: m₁
molar mass of NaCl: MM₁
total volume in liters: Vt
Volume of water in mililiters: V₂
mass of water: m₂

2) Density of the solution: mass in grams / volume in mililiters

d = [m₁ + m₂] / (1000Vt)

3) Mass of NaCl: m₁

Number of moles = mass in grams / molar mass

⇒ mass in grams = number of moles × molar mass

m₁ = n₁ × MM₁

4) Number of moles of NaCl: n₁

Molarity = number of moles / Volume of solution in liters

M = n₁ / Vt

⇒ n₁ = M × Vt

5) Substitue in the equation of m₁:

m₁ = M × Vt × MM₁

6) Substitute in the equation of density:

d = [M × Vt × MM₁ + m₂] / (1000Vt)

7) Simplify and solve for M

d = M × Vt × MM₁ / (1000Vt) + m₂/ (1000Vt)

d = M × MM₁ / (1000) + m₂/ (1000Vt)

Making the simplistic assumption that the dissolved NaCl(s) does not affect the volume of the solvent water means 1000Vt = V₂

d = M × MM₁ / (1000) + m₂/ V₂

m₂/ V₂ is the density of water: 1.00 g/mL

d = M × MM₁ / (1000) + 1.00 g/mL

M × MM₁ / (1000) = d - 1.00 g/mL

M = [1,000/MM₁] d - 1,000/ MM₁

8) Substituting MM₁ = 58.5 g/mol

M = [1,000/58.5] d - [1,000/ 58.5]

Comparing with the equation Molarity = m×density + b, you obtain:

m = 1,000/58.5
b = - 1,000/58.5

7 0

3 years ago

Read 2 more answers

What is the Percent yield is 4.65 got copper is produced by 1.87 percent yield is 4.65 got copper is produced when 1.87 grams of

marta [7]

Answer:

Percent yield = 69.4%

Explanation:

Given data:

Percent yield = ?

Actual yield of copper = 4.65 g

Mass of aluminium = 1.87 g

Mass of copper sulfate = excess

Solution:

Chemical equation:

2Al + 3CuSO₄ → Al₂(SO₄)₃ + 3Cu

Number of moles of Aluminium:

Number of moles = mass/ molar mass

Number of moles = 1.87 g/27 g/mol

Number of moles = 0.07 mol

Now we will compare the moles of Al with copper.

Al : Cu

2 : 3

0.07 : 3/2×0.07 =0.105 mol

Mass of Copper:(Theoretical yield)

Mass = Number of moles × molar mass

Mass = 0.105 mol × 63.5 g/mol

Mass = 6.7 g

Percent yield:

Percent yield = Actual yield / theoretical yield × 100

Percent yield = 4.65 g/ 6.7 g × 100

Percent yield = 69.4%

4 0

3 years ago

Like a greenhouse gas, clouds can trap heat emitted from the earth's surface.

olga_2 [115]

True. Because they are white we know that they reflect light, and thus heat.

8 0

3 years ago

Read 2 more answers

Consider the following types of electromagnetic radiation:

liq [111]

Explanation:

Electromagnetic wave Wavelength

(1) Microwave = 1 m to 1 mm = $10^9 nm$ to $10^6 nm$

(2) Ultraviolet = 10 nm to 400 nm

(3) Radio waves = 1 mm to 100 km = $10^6 nm$ to $10^{14}nm$

(4) Infrared = 700 nm to 1 mm

(5) X-ray = 0.01 nm to 10 nm

(6) Visible = 400 nm t0 700 nm

a) In order of increasing wavelength:

: 5 < 2 < 6 < 4 < 1 < 3

b) Frequency of the electromagnetic wave given as:

$\nu=\frac{c}{\lambda }$

$\nu$ = frequency

$\lambda$ = Wavelength

c = speed of light

$\nu \propto \frac{1}{\lambda }$

So, the increasing order of frequency:

: 3 < 1 < 4 < 6 < 2 < 5

c) Energy(E) of the electromagnetic wave is given by Planck's equation :

$E=h\nu$

$E\propto \nu$

So, the increasing order of energy:

: 3 < 1 < 4 < 6 < 2 < 5

6 0

3 years ago