In the chemical reaction shown above, 10.8 g of products were obtained. How many grams of reactants were used?

Answer:

gases

Explanation:

Their atoms are the least far apart

Answer:

(9.03x10^-14)x(8.455x10^20)=7.634865x10^7

(5.2x10^11)/(2.10x10^-4)=2.476190x10^15

(7.67x10^12)x(3.8x10^15)=29146000000000000000000000000

(9.237x10^20)/(4.5x10^-6)=2.0526x10^26

Explanation:

880.209 kilojoules of heat are required to heat 2550 grams of water from 17.5°C to 100.0°C.

The amount of energy released or absorbed by a substance can be calculated using the following expression:

Q = m × c × ∆T

where;

According to this question;

Q = 2550 × 4.184 × 82.5

Q = 880,209J

Q = 880.209kJ.

Therefore, 880.209 kilojoules of heat are required to heat 2550 grams of water from 17.5°C to 100.0°C.

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The molecule pair that directly regulates the cell cycle is CDK (Cyclin-Dependent Kinase) and Cyclin.

CDKs are a family of protein kinases that play a crucial role in regulating the progression of the cell cycle. However, CDKs alone are inactive. Their activation requires binding to specific regulatory proteins called cyclins. Cyclins are named based on their periodic expression levels throughout the cell cycle.

During different phases of the cell cycle, specific cyclins are synthesized and bind to specific CDKs. The formation of CDK-cyclin complexes triggers a series of phosphorylation events that drive the cell cycle forward.

These complexes phosphorylate target proteins involved in cell cycle progression, such as proteins that regulate DNA replication or mitotic spindle formation.

The levels of cyclins oscillate during the cell cycle, ensuring the precise timing and coordination of cell cycle events. Once their function is complete, cyclins are degraded, and CDKs become inactive until the next phase of the cell cycle.

Therefore, the CDK-cyclin complexes are a fundamental pair of molecules directly responsible for regulating the cell cycle progression, ensuring proper cell growth and division.

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Answer:

Filtration and evaporation

Explanation:

A mixture of sand, pink sugar and water can be separated by filtration and evaporation.

The pink sugar is already dissolved in the water but the sand remains undissolved in the water hence it can be filtered off. The filtrate now contains the sugar.

The sugar is obtained from the filtrate by evaporation of the solution to yield the solid pink sugar and steam which can be condensed again to give liquid water.

Answer:

1) harm life forms that rely on carbonate-based shells and skeletons, 2) harm organisms sensitive to acidity

Explanation:

Answer:

Ocean acidification can negatively affect marine life, causing organisms' shells and skeletons made from calcium carbonate to dissolve.

Explanation:the more acidic the ocean, the faster the shells dissolve.

the formula below for the application of KVL around i1 is KVL around loop i1: -10V + 5Ω * (I1 - I2) + 10Ω * I1 = 0.

According to Kirchhoff's Voltage Law (KVL), the sum of the voltages around a closed loop in a circuit is equal to zero. In this case, we are applying KVL around loop i1. The equation represents the sum of voltage drops in the loop, where -10V is a voltage source, 5Ω * (I1 - I2) represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and 10Ω * I1 represents the voltage drop across the 10Ω resistor due to the current I1. The equation is set equal to zero to satisfy KVL.

ii. KVL around loop i2: 10Ω * I2 - 5Ω * (I1 - I2) + 2V = 0

Similar to i, this equation represents the application of KVL around loop i2. The 10Ω * I2 term represents the voltage drop across the 10Ω resistor due to the current I2, the -5Ω * (I1 - I2) term represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and the 2V term represents a voltage source. The equation is set equal to zero to satisfy KVL.

iii. Determine the current i1: Substitute the obtained values into the equation for i1 and solve for I1 in mA.

iv. Determine the current i2: Substitute the obtained values into the equation for i2 and solve for I2 in mA.

v. Determine Vo: Substitute the obtained values for i1 and i2 into the appropriate equation representing the voltage at Vo, and calculate the value in V.

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Answer:

In an experiment in which blood pressure medication is tested, one group is given the blood pressure medication while the control group is given a placebo pill.

In a test of anxiety treatment, one group attends individual therapy sessions and receives a new medication. The control group receives only an inert pill.

A treatment for drug addiction is being tested. A group of meth addicts are given the treatment while the control group is given the placebo.

Researchers are testing the effectiveness of a drug intended to reduce symptoms of Crohn's disease. Many sufferers of Crohn's disease are recruited for the effort and the group that receives the placebo is the control group.

A treatment for hair loss in men is being tested. Men of the same age range are gathered. One group receives an application with the active ingredient while the control group receives an application that appears the same but does not have the active ingredient in it.

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The minimum volume of a 0.100 M calcium hydroxide solution required to neutralize all of the dimethylglycine is 41.2 mL.

The balanced chemical equation for the reaction between dimethylglycine and calcium hydroxide is:

N(CH3)2CH2COOH + Ca(OH)2 → Ca(N(CH3)2CH2COO)2 + 2H2O

From the equation, we can see that 1 mole of dimethylglycine reacts with 1 mole of calcium hydroxide. We can use this information to calculate the amount of calcium hydroxide required to neutralize the acid.

First, we need to determine the number of moles of dimethylglycine in the sample:

molar mass of dimethylglycine = 115.13 g/mol

number of moles = 475 mg / 1000 mg/g / 115.13 g/mol = 0.00412 mol

Since 1 mole of dimethylglycine reacts with 1 mole of calcium hydroxide, we need 0.00412 mol of calcium hydroxide to neutralize the acid.

Finally, we can use the molarity of the calcium hydroxide solution to determine the volume required:

moles of Ca(OH)2 = 0.00412 mol

volume of Ca(OH)2 solution = moles / molarity = 0.00412 mol / 0.100 mol/L = 0.0412 L

Converting this to milliliters:

volume of Ca(OH)2 solution = 41.2 mL

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The term used to denote the concentration of electrolytes in a given volume is "molarity".

Molarity-

Molarity is the number of moles of solute dissolved in one liter of the solution. Molarity is the most widely used concentration metric in chemistry, and it is frequently denoted by "M." It denotes the amount of solute in moles per liter of solution.

A solution's molarity can be calculated using the following formula:

Molarity = moles of solute / liters of solution

Molarity is often used to express the concentration of a solution's electrolytes because electrolytes break into ions when dissolved in a solvent, allowing for electrical conductivity.

Molarity can be used in other applications, such as stoichiometry, which involves determining how much of one compound is required to react completely with another.

Molarity is a useful tool for solving problems that involve chemical reactions since the number of moles of a substance is frequently used to establish reaction ratios, limit reactants, and determine the theoretical yield.

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The empirical formula is the simplest formula of a chemical compound.

To find the empirical formula, we take the following steps;

1) O - 88.10/16,      H - 11.190/1

  O - 5.5,               H - 11.19

  O - 5.5/5.5,        H - 11.19/5.5

  O -  1,                 H - 2

Empirical formula = OH2

2) C - 41.368/12  H - 8.101/1,   N - 32.162/14,   O - 18.369/16

   C - 3,               H - 8,           N - 2,                  O - 1

   C - 3/1,            H - 8/1          N - 2/1                 O - 1/1

    C - 3,             H - 8,           N - 2,                   O - 1

Empirical formula = C3H8N2O

To obtain the molecular formula where n = number of atoms of each element;

Molecular weight = 174.204 g/mol

[ 3(12) + 8(1) + 2(14) + 16]n = 174

n= 174/88

n = 2 (to the nearest whole number)

Hence, we have;

[C3H8N2O]2

The molecular formula is C6H16N4O2

3)  C - 19.999/12,  H - 6.713/1,   N - 46.646/14,   O - 26.641/16

    C - 2,                H - 7,            N -  3,                 O - 2

    C - 2/2,            H - 7/2,         N -   3/2,             O - 2/2

    C - 1,                H - 4,            N -  2,                  O - 1

Empirical formula - CH4N2O

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Answer:

Chromium, calcium, and osmium

Explanation:

These elements are metals, considering this, these elements electron shells(orbitals) are further away from the nucleus, with this, their attractions are not as strong as non-metals, so some of their electrons are able to move freely.

When you accumulate many atoms, these metals can form a "sea of electrons"  because they all have loose electrons interacting with each other. This allows easy conduction of heat and electricity.

Answer:

Chromium

Calcium

Osmium

Explanation:

The elements likely conduct electricity well are chromium, calcium and osmium. As these are metals and are observed to be good conductors of heat and electricity. They have extra electrons to donate and hence flow of electrons cause them to be a good conductor of electricity. Rest iodine is a non-metals which is not good conductors of electricity. Carbon is not itself a good conductor but one of its allotrope which is graphite is a good conductor of electricity.

Based on the data provided, the electric circuit is completed when the key is closed.

An electric circuit is a complete path through which electric current flows

An electric circuit can either be:

An electric circuit consists of :

Therefore, an electric circuit is completed when all the components are connected and the key closed.

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Answer:

Explanation: HAVE A GREAT DAY EVERYONE <3

Answer:

B. Carbon-14

Explanation:

by adding the protons and neutrons you get the mass number which in this case would be 14. this eliminates answer choice a.

I hope this answers your question(s). Have a good weekend!

Answer:

orange juice because it a type of acid.

Explanation:

When chlorine bonds and becomes stable, (had a full outer electron shell), because we know that chlorine has 7 electrons in it’s outer shell, it requires 1 to gain noble gas structure. So, when if bonds with an element and then becomes stable, the gaining of an electron means it becomes a negatively charged ion. (an ion being a charged particle.)

There is the formation of intermolecular hydrogen bonding in ethanol as shown in the model below.

Intermolecular interactions can arise when ethanol, a common alcohol, is liquid. These interactions result from the ethanol molecule's polarity and hydrogen bonding propensity.

Two carbon atoms, five hydrogen atoms, and one oxygen atom make up the compound ethanol (C2H5OH). Because the oxygen atom is more electronegative than the carbon and hydrogen atoms, they are bound together by a polar covalent bond.

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Answer:

X

Explanation:

because it is the greatest

Bicarbonate acts as a buffer and helps to maintain the acid-base balance in the body, it is not classified as an electrolyte that needs replacement.

Electrolytes are substances that conduct an electric current in solution. Electrolytes are important for various functions of the body such as regulating fluid balance and transmitting nerve signals. In the body, there are several electrolytes present which are important for the proper functioning of the body.

Major electrolytes that need replacement include sodium, potassium, calcium, magnesium, chloride, bicarbonate, and phosphate. Except for Bicarbonate, all other electrolytes mentioned above need replacement. Hence, the correct option is Bicarbonate. It is important to maintain electrolyte balance in the body to keep the body functioning properly. It can be achieved through a balanced diet and drinking enough fluids, particularly water. If electrolyte imbalance persists, medical attention should be sought.

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The electrolytes that do not need replacement include helium.

Electrolytes are charged ions present in the body. The major electrolytes that need replacement include sodium, potassium, and chloride ions. Sodium is the most abundant electrolyte present outside the cell, whereas potassium is present inside the cell. These ions help in maintaining fluid balance in the body and play a significant role in muscle and nerve function.

Chloride ions, along with sodium ions, help in maintaining the pH of the body fluids. Helium is a gas present in the atmosphere and is not considered an electrolyte as it does not carry an electrical charge. It has no role in the physiological function of the body. Therefore, helium is not included in the list of major electrolytes that need replacement.

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1) The speed of the particles would increase when heated

2) The balloon would expand when heated and contract when cooled.

3) On a hot day, the pressure of the gas in a beverage increases

4) The mercury thermometer works by expanding or contracting in response to temperature change.

We know that one of the effects of temperature is that it is able change the molecular motion of an object. Thus the molecules of an object are able to move faster when heat is applied and they are able to slow down when the heat is removed.

This is why a balloon would have a greater volume when the temperature is increased as the gas molecules spread out. The volume would reduce or decrease when the temperature is reduced.

Also, on a hot day, a beverage would tend to be more fuzzy as the pressure of the gas in the beverage would increase as the temperature is increased.

Lastly, when we use the mercury thermometer, the volume of the mercury would increase and this is the reason for the expansion of the mercury during temperature measurement.

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Answer:

Mass.

Si Unit Measurement.

volume.

milliliters.

Answer:

Metallic character (becoming less metal like)

Explanation:

I took the test

Because of their differing nuclear charges, and as a result of shielding by inner electron shells, the different atoms of the periodic table have different affinities for nearby electrons.

The electron affinity is the potential energy change of the atom when an electron is added to a neutral gaseous atom to form a negative ion. So the more negative the electron affinity the more favourable the electron addition process is.

Not all elements form stable negative ions in which case the electron affinity is zero or even positive.

Electron affinity depends on the nuclear charge of an atom.

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Answer:

See explanation below

Explanation:

You forgot to put the picture to do so. In this case, I manage to find one, and I hope is the one you are looking for. If not, then post it again and I'll gladly help you out again.

According to the picture with the answer, we have a cyclohexane with 4 methyl groups there. Two of them are facing towards the molecule with a darker bond. This means that the alkyl bromide, should have a bromine in one of the bonds, and in order to produce an E2 reaction, this bromine should be facing in the opposite direction of the methyl groups which are facing towards. This is because an E2 reaction occurs with the less steric hindrance in the molecule. If the bromine is in the same direction as the methyl group, it will cause a lot more of work to do a reaction, and therefore, an E2 reaction. I will promote instead a E1 or a sustitution product.

Therefore the alkyl bromide should be like the one in the picture 2.

Answer:

Yes. Mercury is nearly twice as heavy as tin.

Answer:

yes

Explanation:

mercury is nearly twice as heavy as tin!

It is possible for pure silicon to be arranged in a mono crystaline structure. That is, all of the silicon atoms align in a very specific, well-ordered manner, without any voids or breaks in the pattern. As silicon has only four electrons in its valence shell, four more electrons would be needed to fill the shell. In the crystal, any given atom of silicon effectively “shares” an electron from its four closest neighbors through a covalent bond (meaning “with or among the valence”). Each atom does this, therefore each atom is tightly bound to its neighbors.

There are 0.0054 moles of H₂SO4 in 50 cm³ of 0.108 moldm⁻³ of the acid.

The number of moles of H₂SO4 present in 50 cm³ of a 0.108 moldm⁻³ solution of the acid can be calculated as follows

Molarity (M) is the number of moles of solute per litre of solution. 1 mole of solute is present in 1 litre of solution with a molar concentration of 1 moldm⁻³.

The number of moles (n) present in a solution can be calculated as follows

No. of moles = Molarity × Volume (in dm³)

No. of moles = Concentration (in moldm⁻³) × Volume (in dm³) / 1000cm³

                      = 0.108 moldm⁻³ × 50 cm³ / 1000cm³

                      = 0.0054 moles.

Hence, there are 0.0054 moles of H₂SO4 in 50 cm³ of 0.108 moldm⁻³ of the acid.

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Answer: it’s the chemicals between the biological

Explanation:

The productivity of photosynthesis affect the productivity of cellular respiration by providing energy.

Photosynthesis is a process where plants prepare their food in the presence of sunlight.

Photosynthesis process chemically illustrated as :

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

From the above it is clear that carbohydrate is produced in the photosynthesis process and this carbohydrate provide energy to the plant for the completion of another chemical process. So, for the cellular respiration plants use this energy.

Hence, the productivity of photosynthesis directly affect the productivity of cellular respiration.

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