PLEASE HELP I REALLY NEED THIS IM LATE

Answer:

49

Explanation:

Según la pregunta;

Relación de número atómico a número de neutrones = 7: 5

Debemos tener en cuenta que el número de neutrones = número de masa - número atómico.

Dado que el número total es 84

Sea el número atómico x

Por eso;

7/5 = x / 84 -x

7 (84 -x) = 5x

588 - 7x = 5x

588 = 5x + 7x

588 = 12 veces

x = 588/12

x = 49

Dado que número atómico = número de protones = número de electrones

El número de electrones = 49

Answer: 0.44 j/g degrees Celsius

Explanation: i got the answer right on my test

Answer:

is simple apply formula dude.

Answer:

the rise and fall is the tides.

Answer:

m_r = 125 g

Explanation:

Formula to calculate the remaining mass is;

m_i = m_r × 2^(t/λ)

Where;

m_i is initial mass of sample

m_r is remaining mass after time t.

t is time

λ is half life.

We are given;

m_i = 1000 g

t = 15.9 years

λ = 5.3 years

Thus;

1000 = m_r × 2^(15.9/5.3)

1000 = 8m_r

m_r = 1000/8

m_r = 125 g

Answer:

No bro that bro had it coming he should have known when to stop

Explanation:

Answer:

Hmmmmmmm    i think you should just not panic and you should just acept it even though it was an acedent

Explanation:

Answer:

The first one would be "Both Mixtures and Compounds", while the second one would be "Solution 2 - Because she used more salt".

Explanation:

An element is made up of atoms, but to make a mixture or compound you are combining multiple elements. And when look at the second question, assuming they have the same amount of water, there is a higher ratio of salt in the second one, which would make it more concentrated.

Answer:

Ocean acidification refers to a reduction in the pH of the ocean over an extended period of time, caused primarily by uptake of carbon dioxide (CO2) from the atmosphere

Explanation:

Answer:

Ocean acidification affects marine life

Acidification reduces the availability of carbonate ions in ocean water, which provide the building blocks these organisms need to make their shells and skeletons, significantly reducing the chances for their offspring to survive.

Explanation:

Ocean acidification is the ongoing decrease in the pH of the Earth's oceans, caused by the uptake of carbon dioxide (CO. 2) from the atmosphere. The main cause of ocean acidification is the burning of fossil fuels.

Answer:

D

Explanation:

Gases have low densities. Density is the mass of an object divided by its volume. Mass of gases are quite small. Since the mass is related to mass of the particles itself. However the volume is great since the gases are far apart due to how weak the forces of attraction are ( gases take the shape of the container which means they take up a good bit of space which means greater volume). A small mass divided by a large volume gives a small value (small density).

Answer:

AB = 17 cm

Explanation:

NOTE: This is a mathematics question. Nevertheless, the answer to the question is given below

Please see attached photo for diagram.

The length of AB can be obtained as follow:

Angle A = 54°

Adjacent = 10 cm

Hypothenus = AB =?

Using the Cos ratio, we can simply obtain the length of AB as follow:

Cos A = Adjacent /

Cos 54 = 10 / AB

0.5879 = 10 /AB

Cross multiply

0.5879 × AB = 10

Divide both side by 0.5878

AB = 10 / 0.5878

AB = 17 cm

Answer:

I think it's B so maybe

Explanation:

1 mole of Carbon monoxide reacts with 2 moles of. Hydrogen gas ... use the mole ratio to determine the number of ... the coefficients of the balanced equation. 35.0 g Al mol Al. 26.98 g. Al.

Answer: Mass of solution is 80.4 g

Explanation: 15.8 % = 0.158.   Mark mass of solution with x

You can make an equation for mass of sugar: 0.158 x = 12.7 g

x = 12.7 g / 0.158  

Explanation:

Solid, liquids and gases

Answer:

Solid, liquids and gases

Explanation:

Answer:

The pH of the solution is 11.48.

Explanation:

The reaction between NaOH and HCl is:

NaOH  +  HCl  →  H₂O  +  NaCl

From the reaction of 3.60x10⁻³ moles of NaOH and 5.95x10⁻⁴ moles of HCl we have that all the HCl will react and some of NaOH will be leftover:

[tex] n_{NaOH}} = n_{i_{NaOH}} - n_{HCl} = 3.60 \cdot 10^{-3} moles - 5.95 \cdot 10^{-4} moles = 3.01 \cdot 10^{-3} moles [/tex]

Now, we need to find the concentration of the OH⁻ ions.

[tex] [OH^{-}] = \frac{n_{NaOH}}{V} [/tex]

Where V is the volume of the solution = 1.00 L                

[tex] [OH^{-}] = \frac{n_{NaOH}}{V} = \frac{3.01 \cdot 10^{-3} moles}{1.00 L} = 3.01 \cdot 10^{-3} mol/L [/tex]

Finally, we can calculate the pH of the solution as follows:

[tex] pOH = -log([OH^{-}]) = -log(3.01 \cdot 10^{-3}) = 2.52 [/tex]

[tex] pH + pOH = 14 [/tex]

[tex] pH = 14 - pOH = 14 - 2.52 = 11.48 [/tex]

Therefore, the pH of the solution is 11.48.

I hope it helps you!

Answer:

the ability for a given substance, the solute to dissolve in a solvent is solubility.

Answer:

the ability for a given substance, the solute to dissolve in a solvent is solubility.

Answer:

yes

Explanation:

Answer:

These people were ranked best at chemistry

Explanation:

There are 2 manganese atoms are in Ba(MnO4)2.

Answer:

Explanation:

the top person of me is right bc i have all my notes here and they are right its 2 :)

Answer:

You must change the size of each ingredient by the size of the product. Let's say my recipe calls for 1 bag of flower and 2 eggs. I want to double the amount of product that I make, so I must multiply each of my ingredients by 2. I would now use 2 bags of flower and 4 eggs.

Answer:

Ester

Explanation:

Got it right on the quiz, hope this helps :)

Answer:

Explanation:

https://opentextbc.ca/introductorychemistry/chapter/molecules-and-chemical-nomenclature-2/

Answer:

c. main energy level of an electron

Explanation:

An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are considered to be the building blocks of matter and as such defines or determines the structure of a chemical element.

Generally, atoms are typically made up of three distinct particles and these includes; protons, neutrons and electrons.

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

The principal quantum number, denoted by n, represents the main or overall energy level of an electron.

Basically, this property of an electron determines its energy level, as well as its distance from the nucleus of an atom of any chemical element. Also, as the distance of each orbital from the nucleus increases, the energy level increases respectively. Thus, sets of orbitals having the same principal quantum number (n) are generally referred to as an electron shell.

Answer: CH3CHClCH2Cl

Explanation:Equation is already balanced

Answer:

The answer is B: assesses how many alien civilizations Earth could contact. the exact interpretation is how many alien societies exist and are detectable!

Explanation:

Answer: Natural Resources

Explanation:

Answer: A. the outer core is more dense and farther from the surface than the mantle

Explanation: There are two mantle‘s. But both of them are closer to the surface than the outer core. the outer core is the liquid layer outside of the inner core. The mantle is the next layer after the outer core. It goes: inner core, outer core, stiffer mantle, asthenosphere, ridged mantle, then the earth’s crust.

Answer: In a vacuum, the objects fall at the same rate independent of their respective masses. That means coin and feather both reach ground at same time in a vacuum. Larger objects experience more air resistance than smaller objects. Also, the faster an object falls, the more air resistance it encounters.

Explanation: