7.
Wh
6
Which Lewis electron-dot diagram is correct for
CO2?
2-m
A :0
B.
:0:0:0
0:0
:
©:
::::C::0
D. 0
:0:0:
XX

Answer:

The corect answer would be C.

Explanation:

The flow rate set at a differentt time would be the correct measurement beecause wats and speed add up to your main answer.

Answer:

1.64 moles O₂

Explanation:

Part A:

Remember 1 mole of particles = 6.02 x 10²³ particles

So, the question becomes, how many  '6.02 x 10²³'s are there in 9.88 x 10²³ molecules of O₂?

This implies a division of given number of particles by 6.02 x 10²³ particles/mole.

∴moles O₂ = 9.88 x 10²³ molecules O₂ / 6.02 x 10²³ molecules O₂ · mole⁻¹ = 1.64 mole O₂

_______________

Part B needs an equation (usually a combustion of a hydrocarbon).

Answer:

58.44 g/mole

Explanation:

To calculate the molar mass of NaCl (sodium chloride), we need to find the sum of the atomic masses of sodium (Na) and chlorine (Cl) off the periodic table.

Atomic mass of Na = 22.99 g/mol

Atomic mass of Cl = 35.45 g/mol

Molar mass of NaCl = Atomic mass of Na + Atomic mass of Cl

= 22.99 g/mol + 35.45 g/mol

= 58.44 g/mol

Therefore, the molar mass of NaCl is 58.44 g/mol.

Answer:

6.B

7.B

Explanation:

Mark me as brainliest

Answer:

Continental Drift

Explanation:

The fossils of sea creatures could have reached the top of Mount Everest due to the continental drift theory suggested by geophysicist, Alfred Wegener. To exaggerate, a piece of evidence that supports Wegener’s hypothesis towards a continental drift is the fact that fossils of sea creatures can’t just end up in any random place like Mount Everest. He suggests that there must be something behind this and gradually it led to his well-known theory. His hypothesis towards a continental drift suggests that his second observation was that fossils of the same prehistoric species were found in different continents that were way apart. There was just no way that all the organisms could cross the oceans and reach all of these places.

Answer:

Angel Fish!

Explanation:

Answer:

Angel fish, the other person answered first tho.

Explanation:

According to the molar concentration, if you  have 550 ml of 7 M solution HCI and you want to make 3 L of diluted solution,the new concentration will be 1.28 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.In case of two solutions it is calculated as, M₁V₁=M₂V₂ on substitution gives M₂=7×550/3000=1.28 M.

Learn more about molar concentration,here:

https://brainly.com/question/13385951

#SPJ9

Atoms or molecules that have gained or lost electrons are called ions.

Atoms or molecules that have gained or lost electrons are called ions. When an atom or molecule gains electrons, it becomes a negatively charged ion called an anion. Anions have an excess of electrons compared to the number of protons, resulting in a negative charge.

Conversely, when an atom or molecule loses electrons, it becomes a positively charged ion called a cation. Cations have fewer electrons compared to the number of protons, resulting in a positive charge.

The process of gaining or losing electrons is known as ionization.

#SPJ11

I3- and br3- are stable while f3- is not becuase F  can't because the lower elements like iodine can use an obtainable d-orbital to house the additional pair of electrons.

To learn more about Lewis dot structure visit:

https://brainly.com/question/6973026

#SPJ4

Answer:

Rutherford proved J.J is wrong.

Explanation:

The Plum Pudding Model which was put forth by J.J Thompson stated that atoms are tiny particles of positively charged particles, with tiny negative charged particles stuck inside.

When Rutherford did the goldfoil experiment, he concluded that electrons (the negatively charged particles) actually revolve around the nucleas.

what's the nucleas?

So this too, was put forth by Rutherford that there is a centre of positive charges in an atom called nucleas it consists of protons and neutrons

hence, Rutherford proved that Plum Pudding Model was wrong.

hope I helped you :)

Answer:

It increases as the size of the ions decreases.

It increases as the charge on the ions increases.

It is a measure of the strength of the bonds between ions in a compound.

Explanation:

Hope this helps ♡

Answer:

Ionic Bonds are formed from metal to nonmetals. Covalent Bonds usually form from nonmetals.

Explanation:

Answer:

hope this helps!

Explanation:

This law states that a still object will stay still unless a force pushes or pulls it. A moving object will stay moving unless a force pushes or pulls it. Gravity and friction are forces that constantly push and pull the "stuff" on earth. So, when we roll a ball, it slowly comes to a stop.

Answer:

E = 15×10⁻²⁹ J

Explanation:

Given data:

Frequency of photon = 2.2× 10⁷ Hz

Energy of photon = ?

Solution:

Formula:

E = h.f

h = 6.63×10⁻³⁴ Js

by putting values,

E = 6.63×10⁻³⁴ Js × 2.2× 10⁷ s⁻¹

E = 14.586 ×10⁻²⁹ J

E = 15×10⁻²⁹ J

The energy of photon is 15×10⁻²⁹ J.

The correct option is (a) 1,000,000ºK.

The temperature of the Sun's corona is most nearly equal to option (a) 1,000,000ºK. The corona is the outermost layer of the Sun's atmosphere and is composed of highly ionized gas. The temperature of the corona is much higher than the temperature of the Sun's visible surface (the photosphere), which has a temperature of about 5,500 ºC (or 5,800 ºK). The reason for the high temperature of the corona is still not fully understood, but it is thought to be related to the Sun's magnetic field and the transfer of energy from the Sun's interior to its outer atmosphere.

Click the below link, to learn more about Sun's temperature:

https://brainly.com/question/31543478

#SPJ11

Answer:

a

Explanation:

It's a duh

Answer:

The pressure of gas in kilopascals is 55.9

Explanation:

variables given :

volume

temperature

moles  

unknown variables :

pressure

Select the correct algebraic form for the equation to be used for this calculation.

p= nRT/V

Solve the problem for the pressure of oxygen.

Answer:

Answer: 11.0 g of calcium will react with 10.0 grams of water.

Explanation:

To calculate the moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}\)

moles of \(H_2O\)

\(\text{Number of moles}=\frac{10.0g}{18g/mol}=0.55moles\)

The balanced chemical equation is:

\(Ca+2H_2O\rightarrow Ca(OH)_2+H_2\)

According to stoichiometry :

2 moles of \(H_2O\) require = 1 mole of \(Ca\)

Thus 0.55 moles of \(H_2O\) require=\(\frac{1}{2}\times 0.55=0.275moles\)  of \(Ca\)  

Mass of \(Ca=moles\times {\text {Molar mass}}=0.275moles\times 40g/mol=11g\)

Thus 11.0 g of calcium will react with 10.0 grams of water.

Explanation:

The mass of iron should be produced if 11. 0g of aluminum reacts with 30. 0g of iron (III) oxide is 10.50 g.

To determine the mass of iron produced, we need to use stoichiometry and the balanced chemical equation for the reaction between aluminum and iron(III) oxide.

The balanced chemical equation is:

2 Al + \(Fe_{2} O_{3}\) →  + 2 Fe

From the equation, we can see that 2 moles of aluminum react with 1 mole of iron(III) oxide to produce 1 mole of iron.

First, we need to determine the limiting reactant by comparing the number of moles of aluminum and iron(III) oxide.

Moles of aluminum = mass of aluminum / molar mass of aluminum

= 11.0 g / 26.98 g/mol (molar mass of aluminum)

= 0.407 mol

Moles of iron(III) oxide = mass of iron(III) oxide / molar mass of iron(III) oxide

= 30.0 g / 159.69 g/mol (molar mass of iron(III) oxide)

= 0.188 mol

Since the stoichiometric ratio of aluminum to iron(III) oxide is 2:1, we can see that 0.188 mol of iron(III) oxide requires 0.376 mol of aluminum. However, we have only 0.407 mol of aluminum, which is in excess.

Therefore, the limiting reactant is iron(III) oxide. The amount of iron produced is determined by the moles of iron(III) oxide used. Moles of iron = 0.188 mol (same as moles of iron(III) oxide)

Now we can calculate the mass of iron produced using its molar mass (55.85 g/mol):

Mass of iron = Moles of iron × Molar mass of iron

= 0.188 mol × 55.85 g/mol

= 10.50 g

Therefore, the mass of iron produced is approximately 10.50 grams.

Know more about the Balanced chemical equation here:

https://brainly.com/question/13451900

#SPJ8

The species would be an anuran (an amphibian)

We need to answer this in English.

Here we want to find "A species that mates on the surface and then deposits its eggs in the water to be surrounded by sperm"

This would be known as a species of amphibian called an anuran, specifically a frog or toad.

Frogs and toads belong to the order Anura and have a characteristic reproductive cycle that involves external fertilization. During reproduction, the male releases his sperm into the water, and the female deposits her eggs in the water as well. The eggs are externally fertilized by sperm that swim around them. This process is known as external or external fertilization.

Learn more about eggs:

https://brainly.com/question/1151355

#SPJ1

The percent composition of water  in compound calcium sulfate dihydrate is 20.90%.

Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates a particular element to compound as,mass of element/mass of compound ×100.There are two types of percentage compositions percent weight by volume and percent volume by volume .

In the given example the weight of water=36 g and that of  calcium sulfate dihydrate  calcium sulfate dihydrate =172.17 g

∴percent composition of water in  calcium sulfate dihydrate =36/172.17×100=20.90%.

Thus, the  percentage composition of water in CaSO₄.2 H₂O is 20.90%.

Learn more about percent composition,here:

https://brainly.com/question/17505281

#SPJ1

Mg2N3  compound having general formula X2Y2  it having cation as +3 charge and bonds ionically with group 15 in a 2:3 ratio.

When two or more elements combine chemically  in a specific mass ratio, the resulting product is called a compound. Compounds can be defined as substances consisting of two or more different types of elements in a fixed ratio of their atoms.

A compound is one where  different types of atoms have joined together to form molecules. For example, water is a compound. The chemical name of water is H2O because it contains two hydrogen atoms and one oxygen atom chemically bonded together.

To learn more about compound ,refer;

https://brainly.com/question/13516179

#SPJ13

Fossil fuels are formed over millions of years from the remains of dead plants and animals that have been buried under layers of rock and sediment.

These fuels contain stored carbon that was originally absorbed by the plants and animals during their lifetime. Examples of fossil fuels include coal, oil, and natural gas. When these fuels are burned for energy, the carbon is released into the atmosphere in the form of carbon dioxide, which contributes to climate change. Natural gas is a combustible mixture of hydrocarbons and other organic compounds that is found beneath the Earth's surface. Coal is a non-renewable fossil fuel that is used to generate electricity and heat, and is also used in the production of steel, cement, and other industrial products.

To learn more about carbon click here https://brainly.com/question/13719781

#SPJ11

5761.09L

According to the ideal gas equation

where:

• P is the ,pressure ,of the gas in atm

• V is the, volume ,in litres

• n is the mole of hydrogen gas

• R is the ,gas constant

• T is the, temperature ,in Kelvin

Given the following parameters

P = 1.05atm

R = 0.082057 L*atm/mol*K

T = 55 + 273 = 328K

Determine the mole of hydrogen

Determine the required volume

Hence the required volume of the gas is approximately 5761.09L

After considering the given data we come to the conclusion that the solubility of the unknown salt is 1.05 × 10⁻⁴ mol/L.

The solubility product constant (Ksp) of an unknown salt M₂Z is given as 5.5 × 10⁻⁹. To evaluate the solubility in mol/L of M₂Z, we can apply the following formula:
Ksp = [M]²[Z]²
Here,
[M] and [Z] = molar concentrations of M²⁺ and Z⁻ ions respectively.
Let us consider that the solubility of M₂Z is x mol/L. Then, we can write:
Ksp = x² + 2x²
Evaluating for x, we get:
x = √(Ksp/4)
= √(5.5 × 10–9 / 4)
= 1.05 × 10⁻⁴mol/L.
Therefore, the solubility in mol/L of M₂Z is 1.05 × 10⁻⁴ mol/L.
To learn more about solubility
https://brainly.com/question/23946616
#SPJ1

Answer:

pH = 6.20

Explanation:

The pKa of cacodylic acid is 6.

To solve this question we must use Henderson-Hasselbalch equation:

pH = pKa +log [A⁻] / [HA]

Where pKa is the pKa of the weak acid = 6

And [] could be taken as the moles of A⁻ the conjugate base, and HA, the weak acid.

The moles of the NaOH added to the solution of the weak acid are = Moles A⁻

And moles HA = Initial moles HA - Moles NaOH added

Initial moles HA:

0.0200L * (0.130mol / L) = 0.00260 moles

Moles NaOH:

0.0200L * (0.0800mol / L) = 0.00160 moles = [A⁻]

Moles HA =

0.00260 moles - 0.00160 moles = 0.00100 moles = [HA]

pH = 6 +log [0.00160 moles] / [0.00100 moles]

The pH of the resulting solution is 1.6.

Let cacodylic acid be HA, mixing cacodylic acid and NaOH, the following occurs;

HA(aq) + NaOH(aq) ------> NaA(aq) + H2O(l)

Number of moles of NaOH = 0.0800 molL−1 × 20.0/1000 = 0.0016 moles

Number of moles of HA = 20.0/1000  × 0.130 = 0.0026 moles

We can see that the HA is in excess, Number of moles of excess acid =

0.0026 - 0.0016 = 0.001 moles

Total volume of solution = 20.0 mL + 20.0 mL = 40 mL or 0.004 L

Molarity of excess acid =  0.001 moles/0.004 L = 0.025 M

pH = -log[H^+]

pH = -log[0.025 M]

pH = 1.6

Learn more: https://brainly.com/question/2510654