A student sets up the following equation to convert a measurement.
(The ? stands for a number the student is
going to calculate.)
Fill in the missing part of this equation.
Note: your answer should be in the form of one or more fractions multiplied together.
gcm
3 kg.m
-2.9 x 10
0x0
.
X Х
5

Answer:

3.16 x 10^22 magnesium ions

Explanation:

The molecular weight of MgCl2 is 95.21 g/mol (24.31 g/mol for magnesium + 2(35.45 g/mol) for chlorine), so 10 g of MgCl2 is equal to:10 g / 95.21 g/mol = 0.105 mol MgCl2Since MgCl2 dissociates into one Mg2+ ion and two Cl- ions in solution, the number of magnesium ions in the solution is equal to half the number of moles of MgCl2:0.105 mol MgCl2 * 0.5 = 0.0525 mol Mg2+To convert this to the number of magnesium ions, we need to multiply by Avogadro's number:0.0525 mol Mg2+ * 6.022 x 10^23 ions/mol = 3.16 x 10^22 magnesium ions

The correct options that will result in mole are option B, C, and H

To know the options that will result in mole, do the following:

Ideal gas law states as follow:

PV = nRT

Where

PV = nRT

Make n the subject by dividing both sides by RT

n = PV / RT (option B)

Mole, mass and molar mass are related according to the following formula:

Mole = mass / molar mass (option C)

Molarity is defined as mole per unit volume as shown below:

Molarity = mole / volume

Make mole the subject by cross multiplying.

Mole = Molarity × volume (option H)

Thus, from the above illustrations, we can conclude that the correct options which will result in mole are option B, C, and H

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7 moles of Q10E2 contains 7 x 1023 molecules (Avogadro's number, 6.022 x 1023 molecules per mole).

A molecule is a group of two or more atoms held together by chemical bonds. The atoms in a molecule are usually of the same element, but molecules can also be composed of different elements. Molecules can range in size from the very small, such as a single water molecule, to the very large, such as a protein. Molecules are found throughout the universe, from the inner workings of cells to the farthest reaches of space. The study of molecules is known as molecular science, which is an important branch of chemistry. Molecular science is used to understand the behavior of atoms and molecules, as well as to design new materials and medicines.

Each molecule of Q10E2 contains 10 Q atoms, so 7 moles of Q10E2 contains 7 x 1023 x 10 Q atoms, or 7 x 1024 Q atoms.

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The average atomic mass of the imaginary element : 47.255 amu

The elements in nature have several types of isotopes  

Isotopes are elements that have the same Atomic Number (Proton)  

Atomic mass is the average atomic mass of all its isotopes  

Mass atom X = mass isotope 1 . % + mass isotope 2.% ..

isotope E-47 47.011 amu, 87.34%

isotope E-48 48.008 amu, 6.895

isotope E-49 50.009 amu, 5.77%

The average atomic mass :

\(\tt avg~mass=0.8734\times 47.011+0.06895\times 48.008+0.0577\times 50.009\\\\avg~mass=41.059+3.310+2.886\\\\avg~mass=47.255~amu\)

The right response is (b) Alcoholic KOH, which upon hydrolysis would produce the secondary alcohol propan-2-ol.

The reactant in the reaction described in the question is acetaldehyde, or ethanal, which has two carbon atoms and an aldehyde functional group, giving it the formula CH3CHO. When this ethanal interacts with the Grignard reagent, magnesium, an alkyl group, and a halogen give it the formula RMgX.

The only aldehyde that produces primary alcohol when reacting with the Grignard reagent is formaldehyde, which does not include an alkyl group. While secondary alcohol is produced by other aldehydes.

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Answer:

A. Glucose

Explanation:

Glucose is a monomer and not a polymer. So, option (A) is not a polymer.

Glucose is not a polymer because it is a kind of molecule while Starch , cellulose and DNA are polymers.

The correct answer is option A. Glucose.

Answer:

subtract

Explanation:

To find the net force of two bodies going in opposite directions, we must subtract the forces this is because they are not additive forces.

Answer:

A logic bomb and a time bomb are both types of malicious software or code that are designed to cause harm to a computer system or network. Here's a brief explanation of each:

Logic Bomb:

A logic bomb is a piece of code or software that is intentionally inserted into a system to execute a malicious action when specific conditions are met. It remains dormant until triggered by a predefined event or circumstance, such as a specific date, time, or user action. Once triggered, the logic bomb may perform various harmful actions, such as deleting files, corrupting data, or disrupting system functionality. The purpose of a logic bomb is often to cause damage or to gain unauthorized access to a system.

Time Bomb:

A time bomb is similar to a logic bomb, but it is specifically designed to activate or execute its malicious payload at a certain date or time. It is usually programmed to remain undetected until the predetermined time arrives. The time bomb can be set to trigger after a specific time period or on a particular date, at which point it may carry out destructive actions. Time bombs can be used by attackers to target specific events or to coordinate an attack to occur simultaneously across multiple systems.

Both logic bombs and time bombs are considered forms of malicious code or malware and are used with malicious intent to disrupt, damage, or compromise computer systems or networks. They can be extremely harmful, and it is important to have strong security measures, such as antivirus software and regular system updates, to protect against such threats.

Explanation:

Answer:

pOH=3.4

Explanation:

pH + pOH = 14

So if you have the pH, rearrange the equation:

14-10.6=3.4

Given :

The pressure of 50.0 mL of oxygen gas at 100 ºC increases from 735 mm Hg to 925 mm Hg.

Temperature remains constant.

To Find :

The final volume.

Solution :

735 mm Hg = 0.967 atm

935 mm Hg = 1.230 atm

We know, at constant temperature :

\(P_iV_i=P_fV_f\\\\V_f=\dfrac{P_iV_i}{P_f}\\\\V_f=\dfrac{0.967\times 50}{1.230}\\\\V_f=39.31 \ mL\)

Therefore, final volume is 39.31 ml.

Hence, this is the required solution.

Answer:

1 biosphere 2 hydrosphere 3 geosphere 4 atmosphere

Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

I really hope I'm right! I tried my hardest, please give me brainliest :)

have a good day!

There are  0.05  x \(10^{-6}\) number of moles of Kr(g) having 0.3060 x \(10^{17\\}\)atoms .

A mole is 6.02214076 x 1023 of any chemical unit, including atoms, molecules, ions, and others. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful measure to utilize.

Calculation .

One mole of the any atoms contains 6.022 x \(10^{23}\) atoms .

So , the number of moles of Kr(g) having 0.3060 x 10^17 atoms is calculated as ,

number of moles of Kr = 0.3060 x \(10^{17\\}\)atoms x 1 mole / 6.022 x \(10^{23}\)atoms

number of moles of Kr = 0.05  x \(10^{-6}\) mole

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Answer:

D . GOD BLESS .

Explanation:

Answer:

5l NO

2

at STP

No. of molecules=

22.4

5

mol=

22.4

5

×N

A

molecules

A) 5ℊ of H

2

(g)

No. of moles=

2

5

mol=

2

5

×N

A

molecules

B) 5l of CH

4

(g)

No. of moles of CH

4

=

22.4

5

mol=

22.4

5

N

A

molecules

C) 5 mol of O

2

=5N

A

O

2

molecules

D) 5×10

23

molecules of CO

2

(g)

Molecules of 5l NO

2

(g) at STP=5l of CH

4

(g) molecules at STP

Therefore, option B is correct.

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Answer:0.802atm

Explanation:

To convert pressure from millimeters of mercury (mmHg) to atmospheres (atm), you can use the conversion factor:

1 atm = 760 mmHg

So, to convert the pressure of the light bulb from mmHg to atm, divide the given pressure by 760:

Pressure (in atm) = 610 mmHg / 760 mmHg

Pressure (in atm) ≈ 0.802 atm

Therefore, the pressure inside the light bulb is approximately 0.802 atmosphe

Answer:

Acids and bases can help neutralize each other.

Acids turn litmus paper red, bases turn it blue.

Strong bases can be slippery and slimy feeling.

Acids taste sour, bases taste bitter.

Proteins are made up of amino acids.

Vitamin C is also an acid called ascorbic acid.

Ammonia is a base chemical.

Explanation:

school

I just did this for my class.

Here are 10 facts about acids and bases to help you learn about acids, bases, and pH along with a chart for comparison.

1. Any aqueous (water-based) liquid can be classified as an acid, base, or neutral. Oils and other non-aqueous liquids are not acids or bases.

2. There are different definitions of acids and bases, but acids can accept an electron pair or donate a hydrogen ion or a proton in a chemical reaction, while bases can donate an electron pair or accept hydrogen or a proton.

3. Acids and bases are characterized as strong or weak. A strong acid or strong base completely dissociates into its ions in water. If the compound does not completely dissociate, it's a weak acid or base. How corrosive acid or a base does not relate to its strength.

4. The pH scale is a measure of the acidity or alkalinity (basicity) or a solution. The scale runs from 0 to 14, with acids having a pH less than 7, 7 being neutral, and bases having a pH higher than 7.

5. Acids and bases react with each other in what is called a neutralization reaction. The reaction produces salt and water and leaves the solution closer to a neutral pH than before.

6. One common test of whether an unknown is an acid or a base is to wet litmus paper with it. Litmus paper is a paper treated with an extract from a certain lichen that changes color according to pH. Acids turn litmus paper red, while bases turn litmus paper blue. A neutral chemical won't change the paper's color.

7. Because they separate into ions in water, both acids and bases conduct electricity.

8. While you can't tell whether a solution is an acid or a base by looking at it, taste and touch may be used to tell them apart. However, since both acids and bases can be corrosive, you shouldn't test chemicals by tasting or touching them! You can get a chemical burn from both acids and bases. Acids tend to taste sour and feel drying or astringent, while bases taste bitter and feel slippery or soapy. Examples of household acids and bases you can test are vinegar (weak acetic acid) and baking soda solution (diluted sodium bicarbonate -- a base).

9. Acids and bases are important in the human body. For example, the stomach secretes hydrochloric acid, HCl, to digest food. The pancreas secretes a fluid rich in the base bicarbonate to neutralize stomach acid before it reaches the small intestine.

10. Acids and bases react with metals. Acids release hydrogen gas when reacted with metals. Sometimes hydrogen gas is released when a base reacts with a metal, such as reacting sodium hydroxide (NaOH) and zinc. Another typical reaction between a base and a metal is a double displacement reaction, which may produce a precipitate metal hydroxide.

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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Answer: read your book

Explanation: if you read it should be in there

Answer:

The pigment that causes leaves to be green is chlorophyll. ... As chlorophyll goes away, other pigments start to show their colors. This is why leaves turn yellow or red in fall. In fall, plants break down and reabsorb chlorophyll, letting the colors of other pigments show through.

Answer:

hmmm?what?

Explanation:

ayusin mo flece:>

Even with the additional energy input from increasing both the temperature and concentration, Reaction A will not proceed.

To determine if Reaction A will proceed after both increases, we need to calculate the total energy change for Reaction A.

First, let's calculate the energy change for increasing the temperature by 20°C:

ΔE1 = 50 J

Next, let's calculate the energy change for increasing the concentration by 4 M:

ΔE2 = 100 J

The total energy change for Reaction A is:

ΔEA = ΔE1 + ΔE2 + 300 J = 450 J

Since the current energy level of Reaction A is only 160 J, which is less than the required energy change of 450 J, Reaction A will not proceed even if we increase the temperature and concentration.

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Q methane = Q water

Q = mcΔt

mass water = V x ρ = 1 L x 1 kg/L = 1 kg

298 K to 373K = 25 °C to 100 °C

c water = 75.2 J/mol K = 4.2 J / g °C = 4200 J/kg °C

Q water = 1 x 4200 x (100 - 25)

Q water = 315000 J

Q methane = Q water = 315000 J = 315 KJ

n (mol) methane = ΔH/Q = 890.4 / 315 = 2.83

PV = nRT

V = nRT/P

V = 2.83 x 0.082 x 298/1

V = 69.15 L

Answer:

Filter it

Explanation:

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

The rate of a reaction is not affected by C) the magnitude of the equilibrium constant.

The rate of a reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.

Let's consider which of the following factors affect the rate of a reaction.

The rate of a reaction is not affected by C) the magnitude of the equilibrium constant.

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Answer:

IHD = 0; no unsaturation in the formula

Explanation:

The IHD is also known as the degree of unsaturation formula. This formula is commonly used to get an idea of how many unsaturations a molecule has, and in this way, we can get an approach of the type of compound we are treating. For example, if this number is 1, it means that the compound has at least one unsaturation and it could be a double bond or just cyclical compound.

The IHD is calculated using the following expression:

IHD = (a + 1) - (b + x - c)/2   (1)

Where:

a: number of carbon

b: number of hydrogens

c: humber of nitrogens

x: number of halogens.

Now, we have the formula C₄H₉Cl, let's identify a, b, c and x:

a: 4 carbons;  b = 9 hydrogens;  C = none;   X: 1 chlorine

Replacing in (1) we have:

IHD = (4+1) - (9+1)/2

IHD = 5 - (10/2)

So this number is 0, which means that the molecule does not have any kind of unsaturation (Non double bond, multi bond or cyclical).

Hope this helps

Will Argon, Neon, and Krypton react same

Noble gases only helium and neon are truly inert and the other noble gases will react on a limited scale under very specific conditions and krypton will form a solid with fluorine, and xenon will form a variety of compounds with oxygen and fluorine and the name comes from the fact that these elements are virtually unreactive towards other elements or compounds and they do not react with other element

Neon is a colorless, odorless, unreactive gas and argon is a colorless, odorless, unreactive gas and krypton is a colorless, odorless, unreactive gas

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Answer:

q = - 3.569KJ 0r 3.569KJ Liberated heat (signifying the change in heat is negative)

Explanation:

liberated heat implies that change in heat is negative , therefore

q = -m c ΔT

where, m = mass of the Silver = 249 g

c = specific heat capacity of Silver = 0.235 Jg^{-1} °C^{-1

 ΔT = change in temperature = 87°C- 26 °C= 61°C

q = -m x c x ΔT

= - 249 x 0.235 x 61 = - 3569.415J  rounded to -3569J

Changing to KJ becomes= -3569/1000= - 3.569 KJ

q = - 3.569KJ 0r 3.569KJ liberated heat.