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4 years ago

The table below shows two types of electromagnetic waves and three random applications of electromagnetic waves.

Chemistry

2 answers:

Ilia_Sergeevich [38]4 years ago

6 0

CORRECT ANSWER: GAMMA RAYS-1 AND RADIO WAVES-2

Reptile [31]4 years ago

4 0

Correct Answer is 1 i.e. Gamma rays—2 and radio waves—3

Reason:
1) In a hypernova, star as similar to nuclear fusion converts lighter elements into heavy elements. If fusion is not capable of generating enough pressure to counteract gravity, star immediately collapses to form a black hole. During this process, energy will be released, along the axis of rotation to form gamma-ray burst. Such gamma-ray burst was first detected using Fermi Gamma-ray Space Telescope. Thus, gamma-ray is capable of providing information of gravity fields.

2) Radiowaves are capable of inducing transitions that requires less energies. These transition includes nuclear excitation and electron excitation (in rotational energy level). Depending upon the value to Jmax, it is possible to determine the temperature and heat released by astronomical objects

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What coefficient is assumed if no coefficient written before a formula in a chemical equation

Mice21 [21]

Answer:

Explanation:

Consider the following reaction:

Phosphorus burn in the presence of air and produced diphosphorus pentoxide.

Chemical equation:

P₄ + O₂ → P₂O₅

Balanced chemical equation:

P₄ + 5O₂ → 2P₂O₅

Equation is balanced because there are four phosphorus atoms ans ten oxygen atoms in both side of equation.

Coefficient with reactant and product:

P₄ 1

O₂ 5

P₂O₅ 2

There is no coefficient written before P₄ it means only one P₄ is present.

7 0

4 years ago

For the reaction

Pepsi [2]

Answer:

Mass of Na₂CrO₄ = 5.75 g

Explanation:

First of all we will write the balance chemical equation.

2AgNO₃ + Na₂CrO₄ → Ag₂CrO₄ + 2NaNO₃

Now we will calculate the moles of AgNO₃.

Number of moles = mass / molar mass

Molar mass of AgNO₃ = 107.87 + 14 + 3× 16 = 169.87 g/mol

Number of moles = mass / molar mass

Number of moles = 12.1 g / 169.87 g/mol = 0.071 mol

Now we will compare the moles of AgNO₃ and Na₂CrO₄ from balance chemical equation.

AgNO₃ : Na₂CrO₄

2 : 1

0.071 : 1/2× 0.071 = 0.0355

Now we will calculate the mass of Na₂CrO₄.

Molar mass of Na₂CrO₄ = 23×2 + 52 + 16×4 = 162 g/mol

Mass of Na₂CrO₄ = number of moles × molar mass

Mass of Na₂CrO₄ = 0.0355 mol × 162 g/mol

Mass of Na₂CrO₄ = 5.75 g

3 0

3 years ago

2_PCl3 + __Cl2 → __PCL5 What is the answer

bekas [8.4K]

Answer: 2 PCl3 + 2 Cl2 > 2 PCl5

Explanation: The factors will be 2 moles of PCl3 reacted to 2 moles of chlorine gas Cl2 and the reaction will produce 2 moles of Phosphorous pentachloride PCl5.

For the reactants 2PCl3 +2 Cl2 there will be 2P, Cl (2x3) +

(2x2) so chlorine will have 10. In the product side 2PCl5. 2 P and Cl will have (5x2)=10.

The chemical reaction will have a balance chemical equation.

3 0

4 years ago

Draw the Lewis structure (including all lone pair electrons) for one isomer of the molecular formula C3H8O.

Andreyy89

Answer:

Here's how I would do it.

Explanation:

A Lewis structure shows the valence electrons surrounding the atoms.

1. Identify the central atoms

The central atoms are the least electronegative atoms (C).

I chose as my central atoms a chain of four C atoms: C-C-C-C

I stuck the most electronegative atom (O) at the end of the chain:

C-C-C-C-O

2. Complete the structure

The hydrogen atoms must be terminal. Add enough to give every atom an octet.

You should get a structure like the one below

3 0

3 years ago

Which ingredient has the highest amount of calcium? *

sp2606 [1]

The answer is Cheese

8 0

3 years ago