BRAINLIEST ASAP AND 60 POINTS

Answer:

B. Mass

Explanation:

Matter is all the “stuff” that exists in the universe. It has both mass and volume. · Mass measures the amount of matter in a substance or an object.

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The compound has the molecular formula CH₄O. H : O = 1 : 4 : 1 As a result, the empirical formula is CH₄O.

The organic compound sample's mass is 0.5 g, or (0.188 + 0.062 + 0.25) The vapor density should not have a unit.

The organic compound has a molar mass = 16 × 2 g/mol

                                                                            = 32 g/mol

Moles of C atoms = (32 g) × (0.188/0.5) / (12 g/mol) = 1

Moles of H atoms = (32 g) × (0.062/0.5) / (1 g/mol) = 4

Moles of O atoms = (32 g) × (0.25/0.5) / (16 g/mol) = 1

Hence, molecular formula = CH₄O

Thus, the compound has the molecular formula CH₄O. H : O = 1 : 4 : 1 As a result, the empirical formula is CH₄O.

Organic molecules contain covalently bound carbon and hydrogen as well as frequently additional elements. Benzoic acid, diethyl malonate, propanoic acid, butanoic acid, malonic acid, amines, heterocyclic compounds, and benzoic aldehyde are all examples of organic compounds. Organic substances include the carbohydrates, fats (lipids), proteins, and nucleic acids that make up the components of life. Organic molecules include petroleum and natural gas, which constitute the majority of fossil fuels.

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Answer:

three structural isomers

Pentane (C5H12) is an organic compound with five carbon atoms. Pentane has three structural isomers that are n-pentane, Iso-pentane (methyl butane) and neopentane (dimethylpropane).

Answer:

Cell growth usually refers to cell proliferation, the increase in cell numbers that occurs through repeated cell division. Cell growth can also refer to the enlargement of cell volume, which can take place in the absence of cell division. As living things grow, some cells die or become damaged and need replacements. Some single-celled organisms use a type of mitosis as their only form of reproduction. In multicellular organisms, cell division allows individuals to grow and change by expanding the number of total cells.

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Answer:

The concentration of this solution in units of pounds per gallon is \(2.776*10^{-5} \frac{lb}{gal}\)

Explanation:

Units of measurement are established models for measuring different quantities. The conversion of units is the transformation of a quantity, expressed in a certain unit of measure, into an equivalent one, which may or may not be of the same system of units.

In this case, the conversion of units is carried out knowing that 1 μg are equal to 2.205*10⁻⁹ Lb and  1 mL equals 0.00022 Gallons. So

\(2.77 \frac{ug}{mL} = \frac{2.77 ug}{mL}\)

If 1 μg equals 2.205*10⁻⁹  lb, 2.77 μg how many lb equals?

\(lb=\frac{2.77ug*2.205*10^{-9}lb }{1ug}\)

lb=6.10785*10⁻⁹

So, 2.77 μg= 6.10785*10⁻⁹ lb

Then:

\(2.77 \frac{ug}{mL} = \frac{2.77 ug}{mL}=\frac{6.10785*10^{-9}lb }{mL} =\frac{6.10785*10^{-9}lb }{0.00022 gal} =\frac{6.10785*10^{-9}lb }{0.00022 gal}\)

You get:

\(2.77 \frac{ug}{mL} = 2.776*10^{-5} \frac{lb}{gal}\)

The concentration of this solution in units of pounds per gallon is \(2.776*10^{-5} \frac{lb}{gal}\)

The correct option is Br, Cl

What are halogens?

Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and Tennessee are the five or six chemically related elements that make up the halogens group in the periodic table (Ts). Group 17 is the name given to this group in the current IUPAC nomenclature.

The definition of "halogen" is "salt former" (or "salt maker"). Silver bromide, potassium iodide, calcium fluoride, and sodium chloride are just a few of the compounds that are created when halogens combine with metals.

There are other families of halogen oxides that are known to form various anions, including the one shown in the figure attached to the question but which I am unable to reproduce here.

Chlorine, bromine, and iodine frequently combine to create these anions. When the halogen's octet expands, these anions are created. This suggests that the halogen's outermost shell now has more than eight electrons.

Hence, Br and Cl are the correct option

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Answer:

Positively charged ions are called cations; negatively charged ions, anions

Answer:

For number 2, your answer is C.

Explanation:

The nucleus is positively charged because the proton is positive and a neutron is neutral. An electron has a negative charge.

Answer:

The temperature and pressure below which a supercritical fluid exists.

Explanation:

Critical point is a region on the phase diagram where fluid phases (liquids and gases) have the equal density.

This is caused by increased temperature and pressure of the fluid particles in a confided container. Supercritical fluids exist in a state above critical point.

I hope this explanation was clear.

Answer:

B. a covalent bond.

Answer:

i would say the first one!

Na₂SO₄ contains 1.90834 X 10²⁴ molecules or formula units in a 450 gram sample.

Formula unit- The chemical formula of an ionic compound that lists the ions in the smallest ratio that corresponds to a neutral electrical charge is known as a formula unit. Chemical formulae are used to describe the constituent parts of a compound in chemistry.

Na₂SO₄ molecular mass is 23x2+ 32+ 16X4.

= 142g/mol

Na₂SO₄ mass = 450g

Na₂SO₄ moles are equal to mass/molar mass.

450g/142g/mol = 3.170 mol.

6.02 X 10²³ mol is the Avogadro's number.

formula unit= moles * Avogadro's number

⇒3.17 X 6.02 X 10²³ molecules= 1.90834 X 10²⁴  

Na₂SO₄ therefore contains 1.90834 X 10²⁴ molecules or formula units..

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The reactant in a chemical process that releases less energy than the result does the following. Heat absorption will help the reaction move forward.

Heat absorption refers to the process by which a material or object takes in and retains thermal energy from its surroundings. This can occur through several mechanisms, including conduction, convection, and radiation.

The ability of a material to absorb heat is determined by its specific heat capacity, which is a measure of how much energy is required to raise the temperature of the material by a given amount. Materials with a high specific heat capacity can absorb more heat without experiencing a significant increase in temperature.

Heat absorption has important implications in many areas of science and engineering, including thermodynamics, materials science, and climate science. It is also relevant to everyday life, as it affects the performance of various devices and systems, such as air conditioning units, solar panels, and cooking appliances.

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The complete question is:

Which of the following is true about a chemical reaction in which the reactant stores less energy than the product?

the answer is oxygen very easy

Answer:

well, oxidizing, and you can use special produvcts to stop it, and you can get it for cheap

Answer:

The black snakes will survive and reproduce while the orange snakes die out.

Explanation:

The orange snakes will be easier to see by their prey and predators, and therefore will die out while the black snakes thrive because of their camouflage.

Answer:

the black snakes will survive and reproduce, therefore, passing their traits to their offspring, while few orange snakes will remain in the population.  

Explanation:

Answer: The final pressure is 12.6 atm

Explanation:

The combined gas equation is,

\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)

where,

\(P_1\) = initial pressure of gas = 5.6 atm

\(P_2\) = final pressure of gas = ?

\(V_1\) = initial volume of gas = v

\(V_2\) = final volume of gas = \(v-\frac{50}{100}v=0.5v\)

\(T_1\) = initial temperature of gas = \(-19.0^0C=(-19+273)K=254K\)

\(T_2\) = final temperature of gas = \(12.0^0C=(12.0+273)K=285K\)

Now put all the given values in the above equation, we get:

\(\frac{5.6\times v}{254}=\frac{P_2\times 0.5v}{285}\)

\(P_2=12.6atm\)

The final pressure is 12.6 atm

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

Number of moles = 0.94 mol

Explanation:

Given data:

Number of moles of sodium chloride = ?

Volume of sodium chloride = 1.25 L

Concentration of solution = 0.750 mol/L

Solution:

Formula:

Concentration = number of moles/ volume in L

By putting values.

0.750 mol/L = number of mole / 1.25 L

Number of moles =  0.750 mol/L×1.25 L

Number of moles = 0.94 mol

The mass of Aluminum Sulfate is 5.373 grams if you have \(2.837*10^{26\) atoms of Sulfur .

The molecular formula of Aluminum Sulfate is \(Al_2(SO_4)_3.\) In one molecule of aluminum sulfate, there are 3 sulfur atoms. To calculate the mass of aluminum sulfate, follow the steps below:

Step 1: Calculate the molar mass of aluminum sulfate using the periodic table.Al = 27.0 g/molS = 32.1 g/molO = 16.0 g/mol

(2 × Al) + (3 × S) + (12 × O) = molar mass of \(Al_2(SO_4)_3.\) = 342.2 g/mol

Step 2: Find the number of moles of sulfur in the given number of atoms of sulfur.2\(2.837*10^{26\) atoms of sulfur × 1 mol S/\(6.022 * 10^{23\)atoms S = 0.0470 mol S

Step 3: Use the molar ratio of sulfur to aluminum sulfate to calculate the number of moles of aluminum sulfate.1 mol \(Al_2(SO_4)_3.\) / 3 mol S = 0.333 mol\(Al_2(SO_4)_3.\) per mol S0.0470 mol S × 0.333 mol \(Al_2(SO_4)_3.\)/mol S = 0.0157 mol \(Al_2(SO_4)_3.\)

Step 4: Calculate the mass of aluminum sulfate.0.0157 mol \(Al_2(SO_4)_3.\) × 342.2 g/mol\(Al_2(SO_4)_3.\)= 5.373 g\(Al_2(SO_4)_3.\)

Therefore, the mass of Aluminum Sulfate is 5.373 grams if you have \(2.837*10^{26\) atoms of Sulfur.

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Answer:

Explanation:

.01 mol CaSO4 is the conversion factor between these values and now you just need to multiply it by the molar mass of .01 x 136.14=1.36g CaSO4

Apologies for having the wrong answer before this, it's been a long day.

Answer:

7.2km/h.

Explanation:

Therefore, we get the speed of the man crossing a 600m long street in 5 minutes as 7.2km/h.

Answer:

Those thing which can be renewed or replaced shortly after it is exhausted at its place of origin is called renewable energy

Those think which cannot be replaced shortly after it is exhausted at its place of origin is called no renewable energy.

Answer:

renewable energy means those who doesn't finish over a long period of time and never finish. but non renewable energy means those who finished one day.

Answer:

To determine the time required, we need to use the formula:

mol Al = (I*t)/(n*F)

where I is the current inamperes, t is the time in hours,n is the number of electrons involved in the reaction (3 for AI203 -> 2AI + 302), and F is the Faraday constant (96,485 C/mol).

First, we need to calculate the amount of charge that has to pass through the circuit to produce

4.00 g of Al.

The molar mass of Al is 26.98 g/mol, so we have:

4.00 g Al * (1 mol/26.98 g) = 0.148 mol Al

To produce 0.148 mol of Al, we need 3/2 * 0.148 mol of electrons (because of the 3:2 stoichiometry of the reaction):

0.148 mol Al * (3 mol e-/2 mol AI) = 0.222 mol e-

Each electron carries a charge of 1.602 x 10^-19 C, so the total charge required to produce 4.00 g of Al is:

0.222 mol e- * 1.602 x 10^-19 C/e- = 3.55 x 10^3 C

Now we can use the formula:

Q = It

where Q is the total charge, I is the current, and t is the time. Solving for t, we get:

t = Q/l = 3.55 x 10^3 C / 2.50 A = 1.42 x 10^3 s Finally, we convert the time from seconds to hours:

t = 1.42 x 10^3 s * (1 min/60 s) * (1 hour/60 min) =

0.394 hours

So it takes approximately 0.394 hours (or 23.6 minutes) to prepare 4.00 g of Al by electrolysis of Al203 using a current of 2.50 A.

Explanation:

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The partial pressure of nitrogen on Venus is approximately 321.914 kPa.

To find the partial pressure of nitrogen on Venus, we need to calculate the partial pressure using the mole fraction of nitrogen and the total atmospheric pressure. First, we convert the total atmospheric pressure from psi to kilopascals (kPa) since the mole fraction is given in terms of kPa.

1 psi = 6.89476 kPa

Therefore, the total atmospheric pressure on Venus is:

1334 psi × 6.89476 kPa/psi = 9197.53 kPa

Next, we can calculate the partial pressure of nitrogen using the mole fraction. The mole fraction of nitrogen is given as 0.035, which means that nitrogen makes up 3.5% of the total moles of gas in the atmosphere.

The partial pressure of nitrogen is given by:

Partial pressure of nitrogen = Mole fraction of nitrogen × Total atmospheric pressure

Partial pressure of nitrogen = 0.035 × 9197.53 kPa

Partial pressure of nitrogen = 321.914 kPa

Therefore, the partial pressure of nitrogen on Venus is approximately 321.914 kPa.

It's important to note that the given atmospheric composition of Venus's atmosphere and the total atmospheric pressure are approximate values and can vary depending on specific conditions and measurements.

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The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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Answer:

C. A tablet contains different chemical compounds

Explanation:

The dietary supplement in this question depicts a kind of matter. Matter, in chemistry, can either be a pure substance or a mixture. Unlike elements and compounds (pure substances) which cannot be separated by physical means, mixtures can be separated using physical method.

A mixture is a combination of different substances with varying physical properties, which serves as basis of their physical separation. According to the image in the question, the Calcium citrate dietary supplement contains different chemical compounds like polyethylene glycol, sodium, methyl cellulose, magnesium silicate etc.

These chemical compounds retain their individual properties and can be separated easily via physical techniques, hence, the dietary supplement is a MIXTURE.

Answer:

There are 92 naturally occurring elements.

Explanation:

NaCl as a limiting reactant ⇒ true

Given

1.2 g NH₄HCO₃

0.75 g NaCl

63.0075 g NaHCO₃

Required

The limiting reactant

Solution

Reaction

NH₄HCO₃ + NaCl ⇒NH₄Cl + NaHCO₃

mol NH₄HCO₃ :

= 1.2 g : 79,056 g/mol

= 0.015

mol NaCl :

= 0.75 : 58.5

= 0.013

NaCl as a limiting reactant(smaller mol)