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Answer:

28

Explanation:

The atom is neutral, which means the quantity of electrons and protons square measure an equivalent. thus if there square measure 13 electrons, there square measure 13 protons. and therefore the nucleon number is neutrons and protons. thus 13+15 is 28

Answer:

Synthesis

Explanation:

Nothing else works

Both element 1 and element 4 have one electron in their valence shell Therefore, they belong to the same group. Therefore, option (C) is correct.

The chemical behavior of elements will depend on the number of electrons in their outermost shell. Elements that are placed in the same group have the same number of valence electrons. Therefore, elements present in the same group of the modern periodic table have similar chemical properties.

The elements with a similar outer shell electronic configuration in their atoms are organized in the same group of the modern periodic table. These valence electrons of an element are responsible their chemical properties and reactivities of the elements.

Elements 1 and 4 have one electron in their valence shell so they belong to the same group while elements 2 and 4 have two electrons in their valence shell that also belong to the same group.

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Answer:

B

Explanation:

Answer :

(a) Reactant Mg is oxidized and reactant Fe is reduced.

(b) Reactant C is oxidized and reactant Cu is reduced.

Explanation :

As we know that a reactant is either reduced or oxidized in a chemical reaction.

Part (a):

The given word equation of chemical reaction is:

Magnesium metal + Aqueous iron (III) sulphate → Iron metal + Aqueous magnesium sulphate

The balanced chemical equation of this word equation will be:

[tex]3Mg(s)+Fe_2(SO_4)_3(aq)\rightarrow 2Fe(s)+3MgSO_4(aq)[/tex]

In this reaction, the oxidation state of reactant Mg changes from (0) to (+2) that shows oxidation due to increase in oxidation state. So, we can say that Mg is oxidized.

And, the oxidation state of reactant Fe changes from (+3) to (0) that shows reduction due to decrease in oxidation state. So, we can say that Fe is reduced.

Part (b):

The given word equation of chemical reaction is:

Solid carbon + Solid copper oxide → Carbon dioxide gas + Copper metal

The balanced chemical equation of this word equation will be:

[tex]C(s)+2CuO(s)\rightarrow CO_2(g)+2Cu(s)[/tex]

In this reaction, the oxidation state of reactant C (carbon) changes from (0) to (+4) that shows oxidation due to increase in oxidation state. So, we can say that C is oxidized.

And, the oxidation state of reactant Cu changes from (+2) to (0) that shows reduction due to decrease in oxidation state. So, we can say that Cu is reduced.

Answer:

Labor unions were created in order to help the workers with work-related difficulties such as low pay, unsafe or unsanitary working conditions, long hours, and other situations. ... Sometimes the unions organized strikes in order to try to change the conditions of the workers.

Explanation:

Answer:

to speak with one voice

Explanation:

a p e x

Answer:  Aluminum reacts with oxygen to produce aluminum oxide as follows: 4Al + 3O2 → 2Al2O3 a.

Explanation: I really really hope that was helpful.

Answer:

it is iodine it seems very right

Answer:

metamorphic

Explanation:

when one rock changes another rock the rock that got changed is now metamorphic

Answer:

C) before you start your job

Explanation:

its the 1st thing to do when ur on a job...i guess not sure but try it anyway....but if im wrong blame

Answer:

I think it's c (before you start your job)

Explanation:

cuz we can get experienced after we are provided job safety training and it is also the first thing we will be given.

sorry if I'm wrong

Answer:

c. fungi

Explanation:

Decomposers are organisms that breaks down dead and decaying matter in nature. They derived their nourishment by breaking down other complex organic matter.

Fungi are a group of organisms that are mainly decomposers.

They recyclers in nature.

Green plants and photosynthetic bacteria are similar in that they obtain nourishment by the use of light to initiate the reaction between carbon dioxide and water.

Many protists are decomposers but not all.

Answer:

[CH₃COOH] = 17.4 M

Explanation:

Acetic acid → CH₃COOH

Molar mass → 60 g/mol

99.5% is percent by mass concentration. It means that 99.5 grams of solute are contained in 100g of solution.

Density → 1.05 g/mL. This data is always referred to solution, not solute!.

We determine solution's volume:

1.05 g/mL = 100 g / V → V = 100 g /1.05 g/mL → 95.2 mL

Now we know, that 99.5 g of acetic acid are contained in 95.2 mL

Let's convert to mmoles → 99.5 g / 60 g/mol = 1.66 moles

We convert solution's volume to L → 95.2 mL . 1L / 1000 mL = 0.0952 L

M (mol/L) = 1.66 mol / 0.0952 L = 17.4 M

Answer:

you will get 17.983 g of lithium for every 100 g of lithium phosphate.

Explanation:

69.7%  is the percent by mass of Lithium in  Li[tex]_3[/tex]PO[tex]_3[/tex]. A percent is obtained by multiplying the result by 100.

One approach to show the concentration for an element within a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total weight of the combination by the mass of each component and multiplying the result by 100%. The mass percent is calculated by dividing the mass that contains the compound and solute by the mass for the element or solute.

99.795g/mol = molar mass of  Li[tex]_3[/tex]PO[tex]_3[/tex]

6.94g/mol = molar mass of Li

mass percentage of Li=(molar mass of Li/molar mass of Li[tex]_3[/tex]PO[tex]_3[/tex])×  100

=(6.94/99.7)×  100

=69.7%

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Answer:

Oh thats great..

But I hate juice :(

Answer:

urinary tract infections. B

Explanation:

A photon is a fundamental particle of light that carries energy and behaves both as a particle and a wave.

It carries electromagnetic waves like visible light, radio waves, X-rays, and gamma rays. Photons have energy, momentum, and angular momentum but no mass.

Photons are particles and waves in quantum physics. They absorb, emit, and scatter stuff at the speed of light in a vacuum. Photons excite electrons in atoms and molecules, starting physical and chemical reactions.

E = hf, where E is the photon's energy, h is Planck's constant, and f is its frequency. Quantum physics relies on photons to comprehend light and matter interactions.

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Answer:

a form of energy that harnesses the power of water in motion—such as water flowing over a waterfall—to generate electricity.

Explanation

Answer:

0

Explanation:

Answer:

B. Electrons can exist in between energy levels .

Explanation:

The value of energy for each energy level in an atom is quantized. Thus, electrons are not allowed to be found in between the energy levels.

When an electron absorbs energy, it becomes excited. And it would jump to a higher energy level whose energy is equal to the new energy of the electron. If the value of its new energy is less than the energy of higher levels but greater than the energy of it current energy level, the electron remains in its initial level. This is because, electrons do not exist in between energy levels .

Answer:

Engery is the driving force of the oxygen cycle is photosynthesis itself, which is responsible for the creation and maintenance of earth's atmosphere.Plants are able to use the energy of sunlight to convert carbon dioxide and water into carbohydrates and oxygen.

Answer:

Energy is the main force of the oxygen cycle and not to mention also photosynthesis, which is responsible for the creation of the earth's atmosphere. This would also mean that plants are the main focus of the Oxygen cycle and energy is needed to make plants. So without energy, no plants would exist!  Not to mention the oxygen cycle wouldn't work without energy.  Plants are also able to use the energy of sunlight to convert carbon dioxide and water into carbohydrates and oxygen.

Hope this helps! :)

Explanation:

The ratio of H⁺ ions to OH⁻ ions at a pH = 2 is 10¹⁰

Given

ph = 2

Required

The concentration of H⁺ and OH⁻ ions

Solution

pH=-log[H⁺]

2=-log[H⁺]

[H⁺]=10⁻²

pH+pOH=14

pOH=14-2

pOH=12

pOH=-log[OH⁻]

12=-log[OH⁻]

[OH⁻]=10⁻¹²

[tex]\tt \dfrac{10^{-2}}{10^{-12}}=10^{10}[/tex]

Answer:

First one: 0.01

second one:  0.000000000001

third one: 10000000000

Answer:

metalloids

Explanation:

The kind of element most likely used to make semiconductors are the metalloids.

These elements have properties between those of metals and non-metals in that they are not truly metals and are partly non-metals.

Answer:

Before the hypothesis

Explanation:

Maybe to not get rained on.

Hahhahahaha I ain't sure tho

Answer:

Fo' drizzle.

Explanation:

Answer:

NaCl (Na is a metal and Cl is a nonmetal) MgO (Mg is a metal and O is a nonmetal) Al2O3, NaF, Na2O

Explanation:

You have to have a metal and a non metal together for it to be ionic

Answer:

Calcium

Explanation:

It is because sodium and potassium are highly reactive metal i.e. Group 1 but calcium is Group 2 element. So, calcium is least reactive.

Answer:

They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes. On Earth, gamma waves are generated by nuclear explosions, lightning, and the less dramatic activity of radioactive decay.

Answer:

H-O* + CH3-CH3 ----> H-O-CH2-CH2*

H-O* + CH[tex]_3[/tex]-CH[tex]_3[/tex] → H-O-CH[tex]_2[/tex]-CH[tex]_2[/tex]* is an example of an initiation phase for an addition polymerization reaction. Therefore, the correct option is option A.

High-molecular-weight compounds known as polymers are created by the aggregation of several smaller molecules known as monomers. Polymers make up the natural and manmade fibres used in clothes as well as the polymers that have revolutionised society.

Two fundamental methods for creating polymers exist: (a) joining small molecules together by an addition reaction, and (b) joining molecules while getting rid of a stable small molecule like water. Condensation processes, which combine addition and elimination reactions, are what this later type of polymerization is known as. H-O* + CH[tex]_3[/tex]-CH[tex]_3[/tex] → H-O-CH[tex]_2[/tex]-CH[tex]_2[/tex]* is an example of an initiation phase for an addition polymerization reaction.

Therefore, the correct option is option A.

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