Which of the following is the correct measurement for the volume of liquid shown below?
A 50.1 mL
B 51 mL
C 50.2 mL
D 52.0 mL

Answer:

Sort of

Explanation:

Each element is unique (forget isotopes for a while), and so, you would expect them to each have unique properties, and you would be right. They each have their properties that belongs to them alone.

But chemists soon found out that some of them even though unique actually share some similarities, like some of them reacting the same way with another given element in very specific proportions, or that some of them had tendencies that other elements didn´t have.

This realization led to creating a table where every atom in a same column had these similar properties, and, by organizing them in order of atomic weight, they found out many other properties that certain regions had. They also noticed that this arrangement led to properties changing quite consistently when you traveled from a point to the other of the table.

This was such a huge huge discovery that, even before we had the heavy duty machinery to identify atoms, and some of them were still to be found, chemists could pinpoint that we still had some to find because, when organizing them, we realized that there were holes, that would be later be filled by an yet undiscovered element.

Also, this table is so powerful that we are 100% sure that we won´t find any more elements before the smallest nor in between the ones already discovered, at most, we can find bigger elements in some crazy star that has super duper harsh conditions that may stabilize bigger ones. I think there are some questions in Quora where physicists (wizard people) discuss this possibility

The number of neutrons in atoms of different elements can be the same

sodium carbonate is a good looking compund available in physics laboratory so that we can microscope the rock cells

Answer:

No

Explanation:

I dont at least but you may be lucky

The value of x is approximately 174.24. The rate of effusion of a gas is inversely proportional to the square root of its molar mass.

If methane (CH4) effuses 3.3 times faster than another gas under the same conditions, we can set up the following ratio: √(molar mass of the other gas) / √(molar mass of methane) = 3.3. Let's assume the molar mass of the other gas is represented by x. Rearranging the equation, we get:

√x / √16 = 3.3

Simplifying further:

√x / 4 = 3.3

Cross-multiplying:

√x = 3.3 * 4

√x = 13.2

Squaring both sides:

x = 13.2^2

x = 174.24\z

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Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

According to the equation we will get 9 molecules of c as 4 molecules of a react with 2 molecules of b to produce 3 molecules of c.

According to the equation, 4 molecules of a react with 2 molecules of b to produce 3 molecules of c. So, for every 4 molecules of a, we get 3 molecules of c.

Therefore, for 12 molecules of a, we will get (12/4) * 3 = 9 molecules of c. Since the question asks for an integer answer without any decimal places, the answer is 9.

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Answer:

covalent bonds please mark me brainliest

In the synthesis of fatty acid methyl esters (FAMES) for biodiesel production, the exact nature of the oil used as a feedstock matters less because the primary focus is on converting the fatty acids present in the oil into their corresponding methyl esters.

FAMES are the main components of biodiesel and can be produced from various vegetable oils, animal fats, or even used cooking oils.

During the transesterification process, the triglycerides present in the oil are reacted with an alcohol (usually methanol) in the presence of a catalyst to produce FAMES. The reaction involves breaking the ester bonds in the triglycerides and forming new ester bonds with the alcohol, resulting in the conversion of the oil into a mixture of FAMES.

Therefore, the precise characteristics of the oil become less critical compared to other factors such as reaction conditions, catalyst choice, and purification techniques in the production of FAMES for biodiesel.

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Answer:

C.4

Explanation:

The arrow 4 represents the transition in which dew is formed.

This is formed as a result of condensation which takes place in the morning or evening and is usually seen on exposed surfaces as water droplets.

The air particles in the form of vapor under low temperatures results in the formation of the substance. The arrow 4 thereby depicts it and makes it the most appropriate choice.,

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Answer:

A synthesis reaction occurs when two or more reactants combine to form a single product in a double replacement reaction two compounds exchange elements. Combustion reaction occurs when a substance reacts quickly with oxygen combustion is commonly called burning. Example'- for synthesis reaction is iron+ oxygen —≥ water . Example:- for combustion reaction is often gaseous products.

may be this was ur answer I hope it might help u

To differentiate between the ETC being blocked at the first step and the second step, the compound that can help differentiate between the two steps is cytochrome c. The correct option is c.

If the ETC is blocked at the first step (ubiquinone ⇒ Complex III), cytochrome c would be in its reduced state.

On the other hand, if the ETC is blocked at the second step (Complex III ⇒ cytochrome c), cytochrome c would be in its oxidized state.

Therefore, the correct option is c

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Complete question:

We have established that an inhibitor causing the accumulation of reduced ubiquinone could block the ETC at any of three possible steps.

1. ubiquinone⇒ Complex III

2. Complex III ⇒cytochrome c

3. cytochrome c⇒ Complex IV

What would be different if the ETC were blocked at the first step listed compared with the second step listed? You would find that ubiquinone was reduced in both cases, but there would be a differentiating factor.

You can differentiate between the first step listed and the second step listed by knowing the oxidation state of which compound.

a. Complex III

b. Complex IV

c. ubiquinone

d. Complex I

e. Complex II

f. cytochrome c

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer

the answer is b

explanation

Answer:

b. topsoil

Explanation:

I just took the test

Explosive materials need to be handled carefully and stored appropriately to avoid the possibility of initial combustion.   The following are some of the precautions to take when handling explosive materials: Avoid any type of friction, impact, or shock, whether small or large, when handling explosive materials.

Keep the containers of explosive materials tightly sealed to prevent the infiltration of moisture or contaminants. Store the explosives in a cool, dry, and well-ventilated environment, keeping them away from any heat sources or flammable materials. Keep the explosives away from direct sunlight to prevent the heat from building up and causing an explosion.

In conclusion, explosive materials should be handled and stored with care to prevent initial combustion, which may lead to an explosion. Explosives should be stored in a dry, cool, and well-ventilated area, and containers should be kept tightly sealed to prevent moisture or contaminants from entering. Explosives should also be kept away from any heat sources or flammable materials.

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Answer:

The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.

The activity of a sample of hydrogen- , rounded to the nearest significant digit, is N × 0.00693 Bq and N × 2.56 × 10⁻¹² Ci.

Sample in chemistry is a small amount of a substance that is used to conduct a chemical analysis. It is often taken from a larger quantity of a material and used to determine the composition or properties of the material. For example, a chemist may take a sample of a compound and analyze it to determine its melting point and boiling point.

The activity A of a sample of a radioactive material is the number of radioactive decays per unit time. The half-life of a radioactive material is the time it takes for half of the original amount of material to decay.

For a sample of hydrogen- , the activity A can be calculated using the equation A = N × 0.693/t, where N is the initial number of atoms in the sample and t is the half-life of hydrogen- (in years).

Given that the half-life of hydrogen- is years, the activity A in becquerels (Bq) is:

A = N × 0.693/t = N × 0.693/ = N × 0.00693

The activity A in curies (Ci) can be calculated by multiplying the activity in becquerels by 3.7 × 10⁻¹⁰:

A = N × 0.00693 × 3.7 × 10-10

Therefore, the activity of a sample of hydrogen- , rounded to the nearest significant digit, is N × 0.00693 Bq and N × 2.56 × 10-12 Ci.

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If cal is titrating 52.5 ml of 0.304 m hbr with 0.344 m ba(oh)2. The amount of ml of ba(oh)2 that cal need to add to reach the equivalence point is :  92.79 ml.

In order to solve this problem, we can use the following equation that relates the moles of acid to the moles of base:

moles of acid = moles of base

We can rearrange this equation to solve for the volume of base needed to reach the equivalence point:

volume of base = moles of acid / concentration of base

First, let's calculate the number of moles of HBr in the solution:

moles of HBr = volume of HBr x molarity of HBr

moles of HBr = 52.5 ml x 0.304 mol/L

moles of HBr = 15.96 mmol

Since the reaction between HBr and Ba(OH)2 is a 1:2 acid-base reaction, we know that the number of moles of Ba(OH)2 needed to reach the equivalence point is twice the number of moles of HBr:

moles of Ba(OH)2 = 2 x moles of HBr

moles of Ba(OH)2 = 2 x 15.96 mmol

moles of Ba(OH)2 = 31.92 mmol

Finally, we can use the equation above to calculate the volume of Ba(OH)2 needed:

volume of Ba(OH)2 = moles of HBr / concentration of Ba(OH)2

volume of Ba(OH)2 = 31.92 mmol / 0.344 mol/L

volume of Ba(OH)2 = 92.79 ml

Therefore, Cal would need to add 92.79 ml of 0.344 M Ba(OH)2 to reach the equivalence point.

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Answer:

B - CALCIUM

Explanation:

Hopes it helps

Answer:

They have like charges

Explanation:

Like charges repel, opposite charges attract

The most likely reason the comb is able to repel the balloon is that, the balloon and the comb have the same electrical charge.

The question is incomplete, the complete question is;

One student rubs a balloon against his hair several times. Another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is the most likely reason the comb is able to repel the balloon?

A.The balloon has a positive charge and the comb is neutral.

B. The balloon and the comb have the same electrical charge.

C. The balloon has a negative charge and the comb is neutral.

D. The balloon and the comb have opposite electrical charges

When the student rubs a balloon against his hair several times or another student passes a comb through her hair several times, static charges are built up on the balloon and the comb.

One of the ways by which a neutral object can be charged is by friction. That is, rubbing it against another object repeatedly.

The fact that when the students place the comb near the balloon and observe that the comb repels the balloon means that both the comb and the balloon acquired the same kind of charge after friction.

Therefore, the balloon and the comb have the same electrical charge.

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Sorting the chemical elements in order from least reactive to most reactive, we have:

1. Fluorine (F).

2. Arsenic (As).

3. Antimony (Sb).

4. Silicon (S).

Given the following chemical elements:

Reactivity can be defined as a chemical property which determines how readily a chemical element bonds with other chemical elements, in order to form a new chemical compound.

Generally, the ability of a chemical element to bond with other chemical elements is largely (highly) dependent on the number of valence electrons it has in the outermost shell of its atomic nucleus.

As a general rule, chemical elements that are having fewer number of valence electrons are the most reactive while those having higher valence electrons are least reactive.

Also, chemical reactivity decreases down a group on the periodic table.

Based on the periodic table, the valency for the given chemical elements are:

In conclusion, sorting the chemical elements in order from least reactive to most reactive, we have:

1. Fluorine (F).

2. Arsenic (As).

3. Antimony (Sb).

4. Silicon (S).

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Answer: D.) single replacement

Reaction Ca 2H2O → Ca(OH)2 H2 is a single replacement reaction.

chemical reaction, a manner in which one or more substances, the reactants, are transformed into one or greater extraordinary substances, the products. materials are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create one-of-a-kind substances as products.

⇒aggregate reaction.

⇒Decomposition reaction.

⇒Displacement reaction.

⇒Double Displacement response.

⇒Precipitation response.

A chemical reaction takes place when one or extra chemicals are modified into one or more different chemicals. Examples: iron and oxygen combine to make rust. vinegar and baking soda combine to make sodium acetate, carbon dioxide, and water.

.

Chemical reactions occur whilst chemical bonds among atoms are fashioned or damaged. The materials that move right into a chemical reaction are known as the reactants, and the materials produced at the top of the response are known as the goods.

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

Answer:

a

Explanation:

A actual molecule of glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.

Answer:

B.

Explanation:

Electrical conductivity helps in identify whether the bond is ionic or covalent bond.

Conductivity is the measure of the ease at which an electric charge or heat can pass through a material or also a solution. A conductor is a material through which electric current or charge can move freely through the material . Based on conductivity  materials can be classified as metals, semiconductors, and insulators.

Along with that conductivity also helps us identify the type of bond that is present. If a compound cannot conduct electricity in its solid or liquid state, the it is considered to be a covalent bond. Because we can see that in covalent bond the conductivity is the least.

Whereas if a compound does conduct electricity when dissolved in solution or molten state, then it is an considered to be an  ionic compound. Therefore we can say that ionic bonds are good conductors of heat and electricity.

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Answer:

When molecules are heated (absorb energy) they move faster – some, or all of the heat energy is converted to kinetic energy. So, when a gas is heated, the effect is to make the molecules move faster.

Explanation:

When you heat a gas, both its vapor pressure and the volume it occupies increase. The individual gas particles become more energetic and the temperature of the gas increases.

Answer: Based on the stoichiometry 1 mole of carbon disulfide will produce 1 mole of carbon dioxide. Similarly we can apply the volume ratio, so 1.1L of carbon disulfide will produce 1.1L of carbon dioxide.