Which of the following numbers is NOT written in scientific notation? (You can only pick two)
1. 76.69 • 10^12
2. 0.69 • 10^5
3. 6.9 • 10^-4
4. 9.99 • 10^-4

Answer:ABC4

Explanation:

The charge of a atom is not visible in a formula.

Answer:

The weight of 3.45 moles of carbon dioxide has been 151.8 grams.

Moles can be calculated as the mass of solute present with respect to the molecular mass of the solute.

Moles can be expressed as:

Moles = \rm \dfrac{weight}{molecular\;weight}

molecularweight

weight

The molecular weight of carbon dioxide has been 44 grams/mol.

The given moles of carbon dioxide = 3.45 moles.

3.45 mol = \rm \dfrac{weight}{44\;g/mol}

44g/mol

weight

Weight of carbon dioxide = 3.45 \times× 44 grams

Weight of carbon dioxide = 151.8 grams.

The weight of 3.45 moles of carbon dioxide has been 151.8 grams.

Answer: It is not balanced

Explanation:

lets balance it:

H2SO4+2Na+NO2->2HNO2+Na2SO4

if you count number of elements you'll see they are equal at both sides of equation

Answer:

\(\huge\boxed{\sf m = 240.5\ g}\)

Explanation:

Given Data:

No. of moles = n = 5.02 mol.

Molar mass = M = 47.9 g/mol

Required:

Mass in g = m = ?

Formula:

\(\displaystyle n = \frac{m}{M}\)

Solution:

Rearranging the formula for m

m = n × M

m = 5.02 × 47.9

m = 240.5 g

\(\rule[225]{225}{2}\)

Answer:

line 2

Explanation:

Because it's where the products and reactants meet together.

The system at dynamic equilibrium is 2.

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The volume of water added to dissolve potassium hydrogen phthalate (KHP) does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

In volumetric analysis, the primary objective is to find the exact concentration of an analyte in a given solution. Analyte refers to the substance whose concentration is to be determined.In order to measure the analyte concentration, the known volume of the titrant of known concentration is added to the analyte until the endpoint is reached.Endpoint refers to the point in a titration where the reaction between the analyte and titrant is complete. The endpoint can be detected by observing a physical change in the system.In the case of KHP, it dissolves completely in any volume of water.

Therefore, the mass of KHP used can be accurately measured and dissolved in any volume of water. As a result, the volume of water added to dissolve the KHP does not affect the accuracy of the experiment.In summary, the volume of water added to dissolve KHP does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

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Answer:

Grade achieved is the dependent variable in the study.

Explanation:

A variable in any research or study is any property, characteristic, number, or a quantity which shows variability or change in its value i.e. it increases or decreases over time, depending on the treatment conditions.

There are two types of variables: Dependent variable and Independent variable.

An independent variable does not depent on any factor for its value or result, rather, a change units value brings about a change in the dependent variable.

A dependent variable is the variable which depends on some factor which the researcher controls. Any change made on the factor by the researcher would bring about a change on the dependent variable.

For example, in the given example above, studying habit affects academic performance. If a student studies more, his/her academic performance will improve as they will achieve higher grades. On the other hand, if a student fails to study, their academic performance will not show any improvement when compared to the group of students who studied. Thus, grade improvement depends on studying habit.

Therefore, grade obtained is the dependent variable in the study.

Answer: The atom's radius increases and the atom becomes a negative ion.

Explanation: The chlorine atom gains an electron, and its radius becomes larger. The chlorine atom loses an electron, and its radius becomes smaller. The chlorine atom loses an electron, and its radius becomes larger.

Answer:

Chlorine gains an electron, leaving it with 17 protons and 18 electrons. Since it has 1 more electron than protons, chlorine has a charge of −1, making it a negative ion. When ions form, atoms gain or lose electrons until their outer energy level is full.

Explanation:

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Isopropylbenzene, also known as cumene, can be synthesized in the laboratory using a Friedel-Crafts alkylation reaction between benzene and propylene.

The reaction is catalyzed by anhydrous aluminum chloride.

The overall reaction can be represented as:

Benzene + Propylene → Isopropylbenzene + Hydrogen Chloride

The mechanism for this reaction involves the formation of a carbocation intermediate, which is then attacked by the nucleophilic benzene ring. The aluminum chloride acts as a Lewis acid catalyst, helping to polarize the double bond in propylene and stabilize the carbocation intermediate.

Here are the steps involved in the mechanism of the Friedel-Crafts alkylation reaction:

Formation of the electrophile: Propylene is polarized by the aluminum chloride catalyst to form a carbocation intermediate:

Propylene + AlCl3 → Propylene carbocation + AlCl4-

Attack of the benzene ring: The benzene ring acts as a nucleophile and attacks the carbocation intermediate, forming a new carbon-carbon bond and creating the final product, isopropylbenzene:

Benzene + Propylene carbocation → Isopropylbenzene

Regeneration of the catalyst: The aluminum chloride catalyst is regenerated by reacting with hydrogen chloride, which is formed as a byproduct of the reaction:

AlCl4- + HCl → AlCl3 + Cl-

Overall Reaction:

Benzene + Propylene → Isopropylbenzene + Hydrogen Chloride

The yield of the reaction can be increased by controlling the reaction conditions, such as the temperature, pressure, and the amount of catalyst used. Additionally, purification of the product can be achieved through distillation or other separation techniques.

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Statement B and statement C are scientific claims for the Mars planet.

Mars has ice caps present at its north and south poles. A permanent portion of the north polar ice cap contains almost water ice. In the northern hemisphere winter, this ice cap gains a coating of frozen carbon dioxide about one meter.

In the southern hemisphere winter, the south polar ice cap acquires a thin layer of frozen carbon dioxide coating. The top layer of the ice cap consists of frozen carbon dioxide and is about 8 meters thick.

Mars is an excellent place to explore because it has many similarities to Earth. Mars was once full of water, warmer, offering a potentially habitable environment, and had a thicker atmosphere.

Designing a mission for Mars would become easier if we could use resources that are already available there. Water is a great resource for human expeditions, both consumed for fuel and by astronauts.

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Answer:

First box: 3

Second box: 4

Third box: 3

Fourth box: 4

Explanation:

I tried out various numbers, but got 3 and 4 because:

3PbI4 + 4CrCl3 -----> 3PbCl4 + 4CrI3

Each term cancels put.

3Pb --> 3Pb

4Cr --> 4Cr

and so forth...

Hope this helps!

The pH of the solution after 21.4 mL of NaOH has been added is 3.75.

HCOOH (formic acid) is a weak acid, so we can use the Henderson-Hasselbalch equation to calculate the pH of the solution at any point during the titration.

The Henderson-Hasselbalch equation is:

pH = pKa + log([A-]/[HA])

where;

At the beginning of the titration, before any NaOH has been added, the solution contains only HCOOH and its conjugate base, HCOO-.

The concentration of HCOOH is 0.125 M, and the concentration of HCOO- is 0.

We can calculate the pH using the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

pH = -log(1.8 x 10⁻⁴) + log(0/0.125)

pH = 2.74

At the equivalence point, all of the HCOOH has been converted to HCOO- by the addition of NaOH, so the pH will be determined by the concentration of the resulting salt. Since HCOO- is the conjugate base of a weak acid, it will undergo hydrolysis to a small extent, producing OH- ions and raising the pH.

However, we are not at the equivalence point yet.

To find the pH after 21.4 ml of NaOH has been added, we need to first calculate how many moles of NaOH have been added. We know the concentration of the NaOH solution (0.175 M) and the volume that has been added (21.4 mL = 0.0214 L), so we can calculate the number of moles of NaOH:

moles NaOH = concentration x volume

moles NaOH = 0.175 M x 0.0214 L

moles NaOH = 0.003745

Since NaOH reacts with HCOOH in a 1:1 ratio, we know that 0.003745 moles of HCOOH have been neutralized.

This means that there are 0.125 - 0.003745 = 0.121255 moles of HCOOH remaining in the solution.

We also know that 21.4 mL of NaOH has been added to 30.00 mL of HCOOH, so the total volume of the solution is now 51.4 mL.

We can use the moles of HCOOH and the total volume to calculate the concentration of HCOOH:

concentration = moles/volume

concentration = 0.121255/0.0514

concentration = 2.357 M

We can use this concentration and the concentration of the conjugate base (which is equal to the number of moles of NaOH added divided by the total volume) to calculate the pH using the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

pH = -log(1.8 x 10⁻⁴) + log(0.003745/2.357)

pH = 3.75

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The complete question is below:

a 30.00-ml sample of 0.125 m hcooh is being titrated with 0.175 m naoh. what is the ph after 21.4 ml of naoh has been added? ka of hcooh is 1.8 x 10⁻⁴

Answer:

D)

Explanation:

It is the most realistic

Answer:

\(C_{2}H_{8} O_{6}\)

Explanation:

Molecular formula can be calculated by finding the ratio of the molecular molar mass to the empirical molar mass, then multiplying the subscripts of the empirical molar mass by that ratio.

The empirical molar mass is 3(12.01) + 4(1.01) + 3(16.00) = 88.07

The molecular molar mass is 180g

180/88.07 = 2

So the molecular formula is \(C_{2}H_{8} O_{6}\)

J. None of the above.

The total amount of energy in a closed system is conserved, meaning that it cannot be created or destroyed, only transformed from one form to another.

What is Energy?

Energy is a physical quantity that measures the ability of a system to perform work. It is an abstract concept that comes in many forms, such as mechanical, thermal, electrical, chemical, and nuclear energy. Energy can be transferred between different objects or systems, and it can be converted from one form to another.

Option H is an example of how thermal energy moves in a predictable pattern. When water is left on a table at a low temperature for a long period of time, its temperature drops below the freezing point of water, and the water molecules start to form ice crystals. This is an example of a predictable pattern in which thermal energy is transferred from the water to the surrounding air, causing the water to freeze.

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The amount of pollution that will get wiped out will depend on the size, composition, and the part of the earth that it lands.  

If a part or piece of Mars were to hit Earth, it would depend on the size and composition of the object as well as where it landed on Earth.

In general, it is unlikely that a single impact event would significantly affect global pollution levels.

However, depending on the impact's location and size, it could cause significant local environmental damage and release large amounts of dust and debris into the atmosphere, which could have short-term effects on air quality and climate.

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Chemical reactions produce compounds with entirely distinct features.

For instance, it is well known that two molecules of the gas hydrogen and one molecule of the gas oxygen combine to generate two molecules of the gas water. Chemically, this reaction can be described by the equation 2Hydrogen + Oxygen 2Water.

The creation of water is an illustration of a synthesis reaction (Water). When hydrogen gas and oxygen gas interact, this process takes place. Water that is in liquid form is the end outcome. A chemical equation is displayed.

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Question:

Liquid water (H₂O) is formed when two gases, hydrogen (H₂) and oxygen (O₂), react. Why are the properties of water different than those of the reactant gases?

A. When substances chemically combine, products with completely different properties form.

B. Water is a liquid, while hydrogen and oxygen are gases.

C. Water has a lower density than hydrogen and oxygen.

D. Water has a higher boiling point than hydrogen and oxygen.

Answer:

The correct option is;

Cylinder A contains a gas that has a temperature closest to absolute zero

Explanation:

From the kinetic theory of gases, the average speed of a gaseous molecule is found from the following equation;

\(v_{rms} = \sqrt{\frac{3\cdot R \cdot T}{MW} }\)

Where:

\(v_{rms}\) = rms speed which is the square root of the average of the velocities of the gas molecules squared which is used in place of the average of the gas molecules as the sum of the velocities of all the gas molecules in the cylinder is zero

R = Universal gas constant = 8.3145 J/(mol·K)

MW = Molecular weight of the gas

Hence where we have;

\(v_{rmsA}\) = Average velocity of gas A = 0.0000001 m/s

\(v_{rmsB}\) = Average velocity of gas B = 0.3 m/s

Since, R and MW are constant for the gas in cylinder A constant, therefore, as \(v_{rmsA}\) ≈ 0 m/s, the temperature, \(T_A\), of gas A is closest to absolute zero.

The symbol of barium ion is Ba²⁺. Barium looses two electrons and get positively charge, and it became cation.

Positively charged ions are known as cations. Negatively charged ions are referred to as anions. A charged atom or molecule is an ion. A balanced atom will change into a positively charged cation if one or more of its electrons are lost.

Because they are positively charged and move toward the negative electrode in an electrical field, these ions are referred to as "cations."

The barium ion has a charge of 2+, or a positive charge of two. To become a positively charged ion known as a cation, the barium ion must give up two electrons. Atoms replicate the electron configuration of the closest noble gas by transforming into ions.

Thus,  To become a positively charged ion known as a cation, the barium ion must give up two electrons.

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To measure the volume of an Erlenmeyer flask, you can use a graduated cylinder or a volumetric pipette.

Fill the Erlenmeyer flask with the liquid whose volume you want to measure. Make sure the flask is on a level surface to obtain accurate measurements.

Using a graduated cylinder: Place the empty graduated cylinder on a flat surface and record its initial volume. Carefully pour the liquid from the Erlenmeyer flask into the graduated cylinder, making sure to include any remaining liquid adhering to the flask walls.

Take note of the final volume reading on the graduated cylinder. The difference between the initial and final volume readings will give you the volume of the liquid in the Erlenmeyer flask.

Using a volumetric pipette: Attach a volumetric pipette to a pipette bulb or a pipette filler. Insert the pipette tip into the liquid in the Erlenmeyer flask, ensuring it is immersed but not touching the sides or bottom. Squeeze the pipette bulb slowly and release it gradually to draw the liquid up into the pipette.

Once the desired volume is reached, remove the pipette from the flask and transfer the liquid into a receiving vessel, such as a beaker or another flask. The volume indicated on the pipette will represent the volume of the liquid in the Erlenmeyer flask.

Remember to read the volume at eye level and take into account the calibration markings on the measuring instrument for accurate measurements.

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The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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i cant understand your question define briefly

Answer:

The placebo effect is when an improvement of symptoms is observed, despite using a nonactive treatment. It’s believed to occur due to psychological factors like expectations or classical conditioning.

Research has found that the placebo effect can ease things like pain, fatigue, or depression.

hope this will help u :)

Protons Ha and Hb in the compound given are enantiotopic.

Enantiotopic protons can be defined as those protons that can be replaced by another groups like deuterium.

A compound is a substance which contains two or more elements chemically combined together.

So therefore, Protons Ha and Hb in the compound given are enantiotopic.

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Answer:

b is the answr

Explanation:

The correct answer is Option (B) Enrichment of Uranium-235 is done.

Hence Option (B) is correct because enrichment of uranium-235 is achieved by the process of conversion So , It does not facilitate containment

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The balanced molecular equation for the reaction would be: \(NaCl (aq) + AgNO_3 (aq) --- > NaNO_3 (aq) + AgCl (aq)\)

A balanced molecular equation is an equation that shows the molecular formulas of the reactants and products of reactions in agreement with the law of conservation of atoms.

Aqueous sodium chloride reacts with aqueous silver nitrate to produce aqueous sodium nitrate and silver nitrate precipitates.

Formula for sodium chloride = NaCl

Formula for silver nitrate = AgNO3

Formula for silver chloride = AgCl

Formula for sodium nitrate = NaNO3

Overall balanced equation of the reaction:  \(NaCl (aq) + AgNO_3 (aq) --- > NaNO_3 (aq) + AgCl (aq)\)

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Answer:

C. 12.8 liters.

Explanation:

The Standard Temperature and Pressure (STP) of a gas are 273.15 K and 100 kilopascals. From Avogadro's Law, a mole of carbon dioxide contains \(6.022 \times 10^{23}\) molecules. If we suppose that carbon dioxide behaves ideally, then the equation of state for ideal gas is:

\(P\cdot V = n\cdot R_{u}\cdot T\) (1)

\(P\cdot V = \frac{r\cdot R_{u}\cdot T}{N_{A}}\) (1b)

Where:

\(P\) - Pressure, measured in pascals.

\(V\) - Volume, measured in liters.

\(r\) - Amount of molecules, no unit.

\(N_{A}\) - Avogadro's number, no unit.

\(R_{u}\) - Ideal gas constant, measured in pascal-liters per mole-Kelvin.

\(T\) - Temperature, measured in Kelvin.

If we know that \(P = 100000\,Pa\), \(r = 3.44\times 10^{23}\), \(N_{A} = 6.022\times 10^{23}\), \(T = 273.15\,K\) and \(R_{u} = 8.314\times 10^{3}\,\frac{L\cdot Pa}{mol\cdot K}\), then the volume of carbon dioxide at STP is:

\(V = \frac{r\cdot R_{u}\cdot T}{N_{A}\cdot P}\)

\(V = \frac{(3.44\times 10^{23})\cdot \left(8.314\times 10^{3}\,\frac{L\cdot Pa}{mol\cdot K} \right)\cdot (273.15\,K)}{(6.022\times 10^{23})\cdot (100000\,Pa)}\)

\(V = 12.972\,L\)

Therefore, the correct answer is C.

Answer:

H2 + CaCl2 -> 2HCl + Ca

How many grams of HCl are made when 2.93 g of

Ca are made?

Explanation:

From the given balanced chemical equation, it is clear that:

2mol. of HCl and 1mol. of Ca are produced.

2mol. of HCl weighs --- 73.0g

1mol. of Ca weighs --- 40.0g

Hence,

73.0g of HCl and 40.0g of Ca are produced.

When 2.93g of Ca is produced then, how many grams of HCl will be produced?

\(=> 2.93g Ca * \frac{73.0g HCl}{40.0g Ca} \\=5.35g HCl\)

Hence, 5.35g of HCl is formed.

The reaction between pottasium metal and chlorine gas is an example of combination reaction and the balanced equation is as follows: 2K + Cl₂ → 2KCl

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, potassium metal reacts with chlorine gas to form solid potassium chloride. The balanced equation is as follows:

2K + Cl₂ → 2KCl

Based on the above equation, pottasium combines with chlorine chemically to form pottasium chloride compound, hence, it is an example of combination reaction.

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