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aleksandrvk [35]
3 years ago
15

How the reddish-brown substance formed

Chemistry
1 answer:
Fudgin [204]3 years ago
4 0

Answer:During a chemical reaction, all of the atoms that make up the reactants rearrange to form the products.

Explanation:

During a chemical reaction, atoms cannot be created or destroyed.

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Substance A undergoes a first order reaction A  B with a half- life of 20 min at 25 °C. If the initial concentration of A ([A]◦
nydimaria [60]

The concentration of A will be <em>0.34 mol·L⁻¹</em> after 60 min.

In a first-order reaction, the formula for the amount remaining after <em>n</em> half-lives is

\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\

If t_{\frac{1}{2}} = \text{20 min}\\

n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}

∴ \text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}

6 0
3 years ago
Which increases the rate of a chemical reaction?
Anastasy [175]
A catalyst

A catalyst can be in many forms
3 0
3 years ago
A hot piece of copper was dropped into 155 g of water at 23.6 °C and 2,100 J of energy was transferred to the water. What is the
BlackZzzverrR [31]

Answer:

26.8 °C

Explanation:

Step 1: Given and required data

  • Mass of water (m): 155 g
  • Energy transferred to the water (Q): 2100 J
  • Initial temperature of the water (T₂): 23.6 °C
  • Final temperature of the water (T₁): ?
  • Specific heat of water (c): 4.184 J/g.°C

Step 2: Calculate the final temperature of the water

We will use the following expression.

Q = c × m × (T₂ - T₁)

T₂ = 2100 J/(4.184 J/g.°C) × 155 g + 23.6 °C = 26.8 °C

5 0
3 years ago
Polly is pushing a box across the floor with a force of 30 N. The force of gravity is –8 N, and the normal force is 8 N. Which v
andrew11 [14]

The answer is -30 N

The explanation:

- to make the box move. so,the horizontal force must be greater than the frictional force.

-and when the horizontal force applied is 30 N. So, the box will remain stationary if the frictional force is equal in magnitude but opposite in direction to the horizontal force. means frictional force = -30 N

This is also being indicate that vertical force due to gravity is equivalent to the normal force when gravity force = 8 N and normal force =8 , meaning the box does not move vertically.

Read more on Brainly.com - brainly.com/question/4162941#readmore

6 0
3 years ago
Read 2 more answers
What is the percentage by mass of the solution formed when 22.0 grams of HCL is dissolved in 90.0 grams of water
snow_lady [41]

Answer: 19.6%

Explanation: percent by mass =

100 × ((mass of solute (g)) ÷ (mass of solute + mass of solvent (g)))

100 × ((22.0gHCl) ÷ (22.0gHCl + 90.0gH20)) = 19.6%

8 0
3 years ago
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