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3 years ago

(b) A compound X contains carbon, hydrogen and oxygen only

Chemistry

1 answer:

faust18 [17]3 years ago

3 0

Answer:

C2H4O

Explanation:

C H O

54.54/12 9.09/1 36.37/16

4.545 9.09 2.27

4.545/2.27 9.09/2.27 2.27/2.27

2.00 4.00 1

Empirical formula is C2H4O

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Calculate the heat needed to be removed to freeze 45g of water at 0C

alexira [117]

Answer: The heat needed to be removed to freeze 45.0 g of water at 0.0 °C is 15.01 KJ.

Explanation:

Firstly, we need to define the term "latent heat" which is the amount of energy required "absorbed or removed" to change the phase "physical state; solid, liquid and vapor" without changing the temperature.
Types of latent heat: depends on the phases that the change occur between them;

Liquid → vapor, latent heat of vaporization and energy is absorbed.
Vapor → liquid, latent heat of liquification and the energy is removed.
Liquid → solid, latent heat of solidification and the energy is removed.
Solid → liquid, latent heat of fusion and the energy is absorbed.

In our problem, we deals with latent heat of freezing "solidification" of water.
The latent heat of freezing of water, ΔHf, = 333.55 J/g; which means that the energy required to be removed to convert 1.0 g of water from liquid to solid "freezing" is 333.55 g at 0.0 °C.
Then the amount of energy needed to be removed to freeze 45.0 g of water at 0.0 °C is (ΔHf x no. of grams of water) = (333.55 J/g)(45.0 g) = 15009.75 J = 15.01 KJ.

4 0

4 years ago

A ball is dropped from a height of 1.20 m and hits the floor. The ball compresses and then reforms to spring upwards from the fl

diamong [38]

Answer:

$\large \boxed{\text{98 m$\cdot$s}^{-2}}$

Explanation:

The formula for the velocity of the ball is

$v = \sqrt{2gh}$

1. Velocity at time of impact

$v = -\sqrt{2 \times 9.807 \times 1.20} = -\sqrt{23.54} = -\textbf{4.85 m/s}$

2. Velocity on rebound

The ball has enough upward velocity to reach a height of 0.86 m.

$v = \sqrt{2 \times 9.807 \times 0.86} = \sqrt{16.87} =\textbf{4.11 m/s}$

3. Acceleration

$a = \dfrac{\Delta v}{\Delta t} = \dfrac{4.11 - (-4.85)}{ 0.091} = \dfrac{8.96 }{0.091} =\textbf{98 m$\cdot$s}^{\mathbf{-2}}\\\\\text{The acceleration while the ball is in contact with the floor is $\large \boxed{\textbf{98 m$\cdot$s}^{\mathbf{-2}}}$}$

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4 years ago

Salt and water are the general products of which type of reaction?

Sauron [17]

Answer:

Acid Base

Explanation:

Acid base reactions produce water by combining H+ from acids and OH- from bases and the remaining spectator ions form salts

5 0

3 years ago

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Which of the following describes an exothermic reaction?

Pavel [41]

Answer:

The answer to your question is: letter A

Explanation:

a) A + B ⇒ AB + heat It is an exothermic reaction because heat is released.

b) A + BΔ ⇒ AB It heat added to the reactants , then it is an endothermic reaction.

c) heat + BC ⇒ B + C It's an endothermic reaction because heat is added to the reactants.

d) B + heat + CD ⇒ BD + C It's and endothermic reaction because heat is added to the reactants.

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4 years ago

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Transferring or sharing electrons between atoms forms

Brums [2.3K]

Transferring or sharing electrons between atoms forms a covalent bond. Covalent bonding is when atoms share electrons. It is a chemical bond that involves the sharing of electron pairs. These pairs are called bonding pairs. Examples of compounds that has covalent bonds are CO2, organic compounds, lipids and proteins.

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4 years ago