Question 1 (1 point)

Why can a solution be classified as a mixture?


Question 1 options:


Both are made up of two substances that are not chemically combined.



Both are always homogeneous.



It is made up of only one substance.



Both are made up of two substances that are chemically combined.


Question 2 (1 point)

Which choice is an element?


Question 2 options:


air (N2 mixed with O2 , and CO2 )



oxygen (O2 )



sodium chloride (NaCl)



water (H2O )


Question 3 (1 point)

Which choice is a compound?


Question 3 options:


air (N2, O2 mixed with CO2)



carbon (C)



carbon dioxide (CO2 )



oxygen (O2)


Question 4 (1 point)

Which choice is a mixture?


Question 4 options:


carbon dioxide (CO2)



oxygen (O­2)



air (N2 mixed with O­2 and CO2)



carbon (C)


Question 5 (1 point)

How is a pure substance different from a mixture?


Question 5 options:


A pure substance is heterogeneous.



Pure substances cannot be separated by physical means.



A mixture is made of one substance.



Mixtures cannot be separated by physical means.


Please help!! You get 20 points!

Answer:

it doesn't make sense bro. how are they gonna form before atoms if they are made out of atoms? everything is

Explanation:

Under the influence of gravity, atoms came together and resulted in a blast causing the "big bang". So the statement is false as stars and planets are formed due to the colliding of atoms.

About 13.7 billion years ago, the universe underwent a dramatic expansion that caused space to expand like a huge balloon.

That sums up the Big Bang idea, which is accepted by almost all cosmologists and theoretical physicists. The theory is backed up by a lot of strong data. For instance, we are aware that the universe is still expanding right now, and that this expansion is speeding up.

According to the conventional Big Bang theory, the beginning of the universe involved a singularity, a region of infinite temperature and density whose nature is difficult for humans to comprehend. However, scholars assert that this may not truly reflect reality because the singularity idea is based on Einstein's theory of general relativity.

The origin of the cosmos is still mostly unknown. A trillionth of a second after the Big Bang, according to scientists, is where the tale may be picked up.

Therefore, the statement is false.

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When a cloud of gas is placed between a hot metal and a detector, the hot metal emits radiation, which passes through the gas cloud.

If a cloud of gas is placed between a hot metal and a detector, it can have different effects depending on the gas and the specific conditions. If the gas is dense enough and has high thermal conductivity, it can act as a heat sink and transfer some of the heat from the metal to the detector, resulting in a decrease in the temperature of the metal and an increase in the temperature of the detector. If the gas is transparent to the radiation emitted by the hot metal, then the detector may not detect any change in radiation. However, if the gas is not transparent to the radiation, it can absorb some of the radiation emitted by the hot metal, leading to a decrease in the amount of radiation detected by the detector. Additionally, the properties of the gas, such as its density, composition, and pressure, can affect the way it interacts with the hot metal and the detector. For example, if the gas is ionized, it can create an electric field that affects the behavior of the charged particles emitted by the hot metal.

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Answer:

E=hv where E=energy h=planks constant v=frequency

So, v=E/h

       =6.8x10^-25/6.63x10^-34

       =1025641026Hz

       =1.03x10^9Hz

       =1.03GHz

Explanation:

The frequency of radar photon is "1.03 GHz".

According to the question,

Energy,

Planks constant,

The frequency will be:

→ \(v = \frac{E}{h}\)

     \(= \frac{6.80\times 10^{-25} \ J}{6.63\times 10^{-34} \ J.s}\)

     \(= 1.03\times 10^{9\ Hz}\)

     \(= 1.03 \ GHz\)

Thus the above response is right.

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The following elements are given in the table:

For the complete table, refer attachment.

Simple rules can be used to calculate the number of protons, neutrons, electrons, mass number and atomic number in an atom:

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer: Here you go :D

Explanation:

Molecules within gases are further apart and weakly attracted to each other. Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

Explanation:

Water the essential constituent of protoplasm of living cells because it is directly involved in countless biochemical reactions like photosynthesis and respiration without it cells couldn't move waste and by-products taking nutrients perform intracellular Transportation functioning and signaling

Answer:A balanced chemical equation provides a great deal of information in a very succinct format. Chemical formulas

provide the identities of the reactants and products involved in the chemical change, allowing classification of the

reaction. Coefficients provide the relative numbers of these chemical species, allowing a quantitative assessment

of the relationships between the amounts of substances consumed and produced by the reaction. These quantitative

relationships are known as the reaction’s stoichiometry, a term derived from the Greek words stoicheion (meaning

“element”) and metron (meaning “measure”). In this module, the use of balanced chemical equations for various

stoichiometric applications is explored.

The general approach to using stoichiometric relationships is similar in concept to the way people go about many

common activities. Food preparation, for example, offers an appropriate comparison. A recipe for making eight

pancakes calls for 1 cup pancake mix, 3

4

cup milk, and one egg. The “equation” representing the preparation of

pancakes per this recipe is

1 cup mix + 3

4

cup milk + 1 egg ⟶ 8 pancakes

If two dozen pancakes are needed for a big family breakfast, the ingredient amounts must be increased proportionally

according to the amounts given in the recipe. For example, the number of eggs required to make 24 pancakes is

24 pancakes ×

1 egg

8 pancakes = 3 eggs

Balanced chemical equations are used in much the same fashion to determine the amount of one reactant required to

react with a given amount of another reactant, or to yield a given amount of product, and so forth. The coefficients in

the balanced equation are used to derive stoichiometric factors that permit computation of the desired quantity. To

illustrate this idea, consider the production of ammonia by reaction of hydrogen and nitrogen:

N2

(g) + 3H2

(g) ⟶ 2NH3

(g)

This equation shows ammonia molecules are produced from hydrogen molecules in a 2:3 ratio, and stoichiometric

factors may be derived using any amount (number) unit:

2 NH3 molecules

3 H2 molecules or

2 doz NH3 molecules

3 doz H2 molecules or

2 mol NH3 molecules

3 mol H2 molecules

These stoichiometric factors can be used to compute the number of ammonia molecules produced from a given

number of hydrogen molecules, or the number of hydrogen molecules required to produce a given number of

ammonia molecules. Similar factors may be derived for any pair of substances in any chemical equation.

Explanation:

Answer:

2.3 kg.

Explanation:

The balanced equation tells us that 2 moles of sodium (Na) reacts with 1 mole of sulfuric acid (H2SO4) to produce 1 mole of hydrogen gas (H2).

To calculate the mass of sodium needed to produce 100g of hydrogen gas, we need to use the following steps:

Calculate the number of moles of hydrogen gas produced from 100g of hydrogen gas.

Use the mole ratio from the balanced equation to determine the number of moles of sodium required to produce that amount of hydrogen gas.

Convert the moles of sodium to grams using the molar mass of sodium.

Step 1:

The molar mass of hydrogen gas (H2) is 2 g/mol. Therefore, 100g of hydrogen gas is equal to 100/2 = 50 moles of H2.

Step 2:

From the balanced equation, 2 moles of Na reacts with 1 mole of H2. So, the number of moles of Na required to produce 50 moles of H2 is:

2 moles Na / 1 mole H2 = 2 * 50 = 100 moles Na

Step 3:

The molar mass of sodium (Na) is 23 g/mol. Therefore, the mass of sodium required to produce 100g of hydrogen gas is:

100 moles Na * 23 g/mol = 2300g or 2.3 kg of Na

Therefore, the mass of sodium needed to produce 100g of hydrogen gas is 2.3 kg.

Answer:

M₂ = 0.34 M

Explanation:

Given data:

Molarity of NaOH =M₁ =  0.200 M

Volume of HF =V₂=  18.25 mL

Volume of NaOH added = V₁ = 31.20 mL

Molarity of HF solution = M₂ = ?

Solution:

M₁V₁  =  M₂V₂

by putting values,

0.200 M × 31.20 mL = M₂ × 18.25 mL

M₂ = 0.200 M × 31.20 mL /  18.25 mL

M₂ = 6.24 M.mL / 18.25 mL

M₂ = 0.34 M

The net ionic equation for the given reaction is as follows: Ba2+ + CO32- -> BaCO3.

The given total ionic equation is as follows: Ba2+ + 2NO3- + 2Na+ + CO32- → BaCO3 + 2Na+ + 2NO3-. The first step to finding the net ionic equation is to write the balanced molecular equation. The balanced molecular equation is given below: Ba(NO3)2 + Na2CO3 → BaCO3 + 2NaNO3.

The next step is to write the total ionic equation, where all the ions that participate in the reaction are written in their ionic forms. Ba2+ + 2NO3- + 2Na+ + CO32- → BaCO3 + 2Na+ + 2NO3-The last step is to cancel out the spectator ions that appear on both sides of the equation. The spectator ions are Na+ and NO3-.The resulting net ionic equation is as follows: Ba2+ + CO32- → BaCO3.

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Answer:

A- Body cells are diploid.

B- Sex cells are haploid.

D- Sex cells do not have pairs of chromosomes.

F- Most cells in humans are body cells.

Explanation:

Body cells are diploid while sex cells are haploid.

The body generally have two kinds of cells which are;

Generally, the body cells are more in number than the gamete or sex cells. These gamete cells are passed on from parents to offspring but body cells are not passed on to offspring.

The following statements are true about gamete cells and body cells;

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Answer:

1451.496

Explanation:

A unit of weight equal to 1,000 kilograms, or approximately 2,204.6 pounds

tons =

kg

______

1000.0

If we have 10 moles of NaN3, we would produce more N2 than Na.



When NaN3 is heated, it decomposes into Na and N2 gas according to the following balanced equation:

2 NaN3(s) → 2 Na(s) + 3 N2(g)

From the equation, we can see that for every 2 moles of NaN3, we would produce 2 moles of Na and 3 moles of N2. Therefore, if we have 10 moles of NaN3, we would produce:

- 10 moles of NaN3 × (2 moles of Na / 2 moles of NaN3) = 10 moles of Na
- 10 moles of NaN3 × (3 moles of N2 / 2 moles of NaN3) = 15 moles of N2

This means that we would produce more N2 (15 moles) than Na (10 moles).

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Answer:

Explanation:

A. Graphite can conduct electricity because of the delocalised (free) electrons in its structure. These arise because each carbon atom is only bonded to 3 other carbon atoms. ... However, in diamond, all 4 outer electrons on each carbon atom are used in covalent bonding, so there are no delocalised electrons.

B. Diamond is hard because the carbon atoms in diamond are bonded in a stronger tetrahedron pattern but graphite is soft and slippery because the carbon atoms in graphite are bonded in layers with only weak vanderwall force holding the layers together.

Answer:

C.proust

Explanation:

Proust's law of definite proportions.

The law of definite proportions was first put forward by the French chemist Joseph Louis Proust in 1779. The discovery that mass was always conserved in chemical reactions was soon followed by the law of definite proportions, which states that a given chemical compound always contains the same elements in the same proportions by mass.

━━━━━━━━━━━━━━━━━━━━━

HOH can interact with other like molecules through:

• dispersion forces, dipole-dipole and hydrogen bonds;

• Therefore ;option C is correct

{Explanation: The intermolecular force which polar molecules take part in are dipole-dipole forces and molecules that is able to have stronger intermolecular between two molecules have dispersion forces, finally hydrogen bonds occurs when hydrogen is covalently bonded to other molecules }

qwertyuiopanshdncjjcjdjwis

Answer:

Those people could sustain on Mars, by living closer to the poles

Explanation:

As it is given that caps involve the water ice instead of the carbon dioxide

And, current observations of spectrum analyzed that the polar caps are totally different from one other i.e northern one involves more water ice while on the other hand,  the southern one involves most of the carbon dioxide

Moreover, the astronomers unable to see to spectrum portions as the atmosphere absorbs the wavelength

So we conclude that the people could survive on mars if they live near to poles

The percentage yield is equal to 200.6%.

The balanced equation for the given chemical reaction is :

2C2H + 5O2 → 4CO2 + 2H2O

Let's find the limiting reagent:

Mass of C2H = 120 g

Mass of O2 = 288 g

Molar mass of C2H = 26 g/mol

Molar mass of O2 = 32 g/mol

The number of moles of C2H is equal to:

120 g × 1 mol/26 g = 4.62 mol

The number of moles of O2 is equal to:

288 g × 1 mol/32 g = 9 mol

According to the stoichiometry of the balanced equation, 2 moles of C2H react with 5 moles of O2, so:

If 4.62 moles of C2H is used, then the required amount of O2 would be:

5/2 × 4.62 mol = 11.6 mol

We only have 9 mol of O2 which means it is the limiting reagent.

C2H is the excess reagent.

Let's find the mass of water produced:

According to the stoichiometry of the balanced equation,2 moles of H2O is produced per 2 moles of C2H2 moles of H2O is produced per 5 moles of O2If 9 mol of O2 is used, the number of moles of water produced would be:

2/5 × 9 mol = 3.6 mol

The mass of water produced is equal to:

3.6 mol × 18 g/mol = 64.8 g

Therefore, 64.8 g of water can be produced.

The amount of excess reagent is equal to:

4.62 mol - 2/2 × 9 mol = 4.62 - 9

= -4.38 mol

C2H is the excess reagent and it is not possible to have negative amount of a substance.

So, we assume that there is no excess reagent.

If 130 grams of water is produced, then the percentage yield is equal to:

Percent yield = actual yield/theoretical yield × 100

Theoretical yield is equal to 64.8 g

Actual yield is equal to 130 g

Percent yield = 130/64.8 × 100

= 200.6%

Therefore, the percentage yield is equal to 200.6%.

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The measured volume of hydrogen gas will be too high.

The volume of hydrogen is measured by collecting the gas over water. The volume of the gas is measured as the volume of water displaced by the gas in an inverted container.

When air leaks into the graduated cylinder, more volume of water is displaced hence a higher volume of hydrogen gas is measured.The calculated molar volume of hydrogen will be too high as a result of this error

The gas being recorded during the experiment would not only include hydrogen gas, but the air that leaked into the eudiometer tube as well. This leads to the increase in the volume of hydrogen gas which will be too high.

Since the volume of hydrogen is too high, therefore the calculated molar volume of hydrogen would also be too high.

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Aqueous solution of HCl is 36.0 % by mass and has a density of 1.10 g/mL. The molarity, molality and mole fraction of HCl is 0.9868 M ; 15.42 m ; and 0.217

The solution can be calculated as follows:

Molarity (M) = Number of moles of solute (HCl) / Volume of solution in liters (L)The density of the solution = 1.10 g/mL

Therefore, 1 L of solution weighs 1.10 x 1000 = 1100 g

The mass of HCl in 100 g of solution = 36 g

Number of moles of HCl in 36 g = 36 / 36.46 = 0.9868 mol

Molarity = Number of moles / Volume of solution = 0.9868 / 1 = 0.9868 M

Molality (m) = Number of moles of solute / Mass of solvent (kg)

The mass of solvent in 100 g of solution = 100 - 36 = 64 g

Molality = Number of moles / Mass of solvent (kg) = 0.9868 / 0.064 = 15.42 m

Mole fraction (X) = Number of moles of solute / Number of moles of solute + Number of moles of solvent

Number of moles of solvent in 100 g of solution = 64 / 18 = 3.56 mol

Number of moles of HCl in 100 g of solution = 0.9868

Mole fraction of HCl = Number of moles of HCl / (Number of moles of HCl + Number of moles of solvent) = 0.9868 / (0.9868 + 3.56) = 0.217

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Answer:

2487.51.

Explanation:

As per Boyle's law temperature remaining constant the volume of an ideal gas is inversely proportional to its pressure.

pV= k

therefore, p1V1 = p2V2

here V1 = 25.3, p2 = 8.04mm Hg

pressure p1 = 790.5 mm Hg

this means that

25.3×790.5 = 8.04V2

⇒V2= 2487.51

Hence, the required volume is, 2487.51.

Explanation:

{c}^C . {d}^D / {a}^A . {b}^B

The molarity of the solution will be 3.45 M

Dilution is the process of adding a solvent to get a more dilute solution.

The moles(n) before and after dilution are the same.

Can be formulated :

M₁V₁=M₂V₂  

M₁ = Molarity of the solution before dilution  

V₁ = volume of the solution before dilution  

M₂ = Molarity of the solution after dilution  

V₂ = Molarity volume of the solution after dilution

The initial solution

345 mL of a 2.5 M NaCl solution.

M₁=2.5 M

V₁=345 ml

The solution after boiled :

V₂=250 ml

\(\tt M_2=\dfrac{M_1.V_1}{V_2}\\\\M_2=\dfrac{2.5\times 345}{250}\\\\M_2=3.45~M\)

The solubility of KHT (solid) in pure water compared with the solubility of KHT (solid) in a 0.1 M KCl solution is predicted to be higher in the 0.1 M KCl solution. This is because the KCl solution has a higher ionic strength, increasing the solubility of ionic compounds like KHT.

Let's understand this in detail:

What is solubility?

Solubility is defined as the ability of a substance to dissolve in a particular solvent under certain conditions. It measures the maximum amount of solute that can be dissolved in a given amount of solvent at a particular temperature, pressure, and other conditions.

Solubility of KHT in pure water:

KHT (Potassium hydrogen tartrate) is a weak acid salt that has low solubility in pure water. The solubility of KHT in pure water is affected by various factors such as temperature, pH, and pressure. The solubility of KHT in pure water is around 4.4 g/L at room temperature.

Solubility of KHT in 0.1 M KCl solution: The solubility of KHT in a 0.1 M KCl solution is predicted to be higher than in pure water. KCl is an ionic salt dissociating in water to produce K+ and Cl- ions. The presence of KCl increases the ionic strength of the solution. This ionic strength improves the solubility of other ionic compounds, such as KHT. KHT has a higher solubility in a 0.1 M KCl solution than in pure water due to this reason.

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Under the assumption that there is no degradation in solution, a weak acid or weak base could be used to create a buffer solution. As a buffer solution, it preserves a certain reaction's or process's stable (rm pH) range.

When a little bit of acid or base is added to the buffer solution, it can neutralize the solution. A buffer solution should satisfy these two requirements: Strong base or weak acid - A weak base or acid should be the main ingredients in a buffer.

A weak acid and its conjugate base, or vice versa, are combined to form an aqueous solution known as a buffer solution (more specifically, pH buffer or hydrogen ion buffer). A little bit of a weak acid or base applied to it barely affects its pH.

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Answer:

D.) H-O

Explanation:

Polarity is determined based on the difference in electronegativity of the atoms. The greater the difference, the more polar the bond. The general trend is that the atoms in the top-right corner of the periodic table are the most electronegative.

A.) is incorrect because H-H has no electronegativity difference, making it nonpolar.

B.) and C.) are incorrect because their electronegativity differences are not the greatest.

D.) is correct because the electronegativity difference between the H and O is the greatest.

Answer:

6 atoms

Explanation:

Hey there!

To find out how many atoms are in this compound, we have to add up all of the atoms

2H means there are 2 atoms

Then we have Cl which is 1 more atoms

Last, we have O₃ which gives us 3 atoms

Now we do basic math:

2 + 1 + 3 = 6

So there are 6 atoms in this compound