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harkovskaia [24]
3 years ago
11

Which of the following best represents the reaction between sulfuric acid and calcium hydroxide? f H2SO4 + 2Ca(OH)2 → 2CaSO4 + 3

H2O g H2SO4 + Ca(OH)2 → CaSO4 + 2H2O h HSO4 + CaOH → CaSO4 + H2O j H2SO4 + Ca(OH)2 → CaSO4 + H2O
Chemistry
1 answer:
Alex_Xolod [135]3 years ago
5 0

Answer:

g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.

Explanation:

Sulfuric acid is represented as H₂SO₄ and calcium hydroxide is represented as Ca(OH)₂.

  • To balance a chemical reaction. we should apply the law of conservation of mass that the no. of different atoms in both sides (reactants and products).

  • The only choice that represent the reactants correctly and apply the law of conversation of mass is:

<em>g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.</em>

<em></em>

<em>f. H₂SO₄ + 2Ca(OH)₂ → 2CaSO₄ + 3H₂O </em>

is not correct that the no. of S, and O is not equal in both reaction sides.

S in reactants (1) while in products (2).

<em>O in reactants (8) while in products (11).</em>

<em></em>

<em>h. HSO₄ + CaOH → CaSO₄ + H₂O</em>

The reactants is represented in a wrong way.

<em> j. H₂SO₄+ Ca(OH)₂ → CaSO₄ + H₂O</em>

is not correct that the no. of H and O is not equal in both reaction sides.

H in reactants (4) while in products (2).

O in reactants (6) while in products (5).

<em></em>

<em>So, the right choice is: g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.</em>

<em></em>

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Which of the following represents an endothermic reaction?
Softa [21]

Answer:

<h2><em><u>A</u></em><em><u>N</u></em><em><u>S</u></em><em><u>W</u></em><em><u>E</u></em><em><u>R</u></em></h2>

The second one would be one of the application of an endothermic reaction as because endothermic reaction always have the heat in the process to mix the reactants and form the products as here in a burning wood when the wood is supplied with heat then it change into products as ashes and smoke fumes So here due to the heat is involved to form the products thats the reaction is endothermic reaction.

Hope it helps

8 0
2 years ago
What are scientific models used for? Give an example of each of the follwoing types of models: idea, physical, computer
leva [86]

Answer:

Scientific models are used to explain phenomena that can not be experience directly and it is also used for prediction.

Explanation:

An example of idea model is the Eistein equation.  An idea model shows how things interact together to produce a particular result.

An example of physical model is the solar system.

Computer model is used to predict long term events and an example of this is computer simulations.

5 0
3 years ago
How many centimeters are in .479 kilometers
trapecia [35]

Answer:

47900 cm

General Formulas and Concepts:

<u>Chemistry</u>

  • Base 10 Decimal System
  • Using Dimensional Analysis

Explanation:

<u>Step 1: Define</u>

0.479 km

<u>Step 2: Identify Conversions</u>

1 km = 1000 m

1 m = 100 cm

<u>Step 3: Convert</u>

<u />0.479 \ km(\frac{1000 \ m}{1 \ km} )(\frac{100 \ cm}{1 \ m} ) = 47900. cm

<u>Step 4: Check</u>

<em>We are given 3 sig figs. Follow sig fig rules.</em>

47900. cm ≈ 47900 cm

7 0
3 years ago
1. Which list of nuclear emissions is arranged in order from the least penetrating power to
Tpy6a [65]

Answer:

A) alpha particle, beta particle, gamma ray

Explanation:

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Properties of alpha radiation:  

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Beta radiations:  

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminum is used to block the beta radiation

⁴₆C → ¹⁴₇N + ⁰₋₁e

The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.  

Gamma radiations:

Gamma radiations are high energy radiations having no mass.

These radiations are travel at the speed of light.

Gamma radiations can penetrate into the many materials.

These radiations are also used to treat the cancer.

Lead is used for the protection  against gamma radiations because of its high molecular density.

The lead apron are used by the person when treated with gamma radiations.

Lead shields are also used in the wall, windows and doors of the room where gamma radiations are treated, in-order to protect the surroundings.

7 0
3 years ago
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Greeley [361]
physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed. For example, if a piece of paper is cut up into small pieces it still is paper.
5 0
3 years ago
Read 2 more answers
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