Please help thank you (15 points)

Answer:

A is the answer hope this helps if wrong I ont know

Hi there!

1 km=1000m

so

6.86 km = 6.86×1000= 6860 m

have a nice day

#YoghurtCup!

Answer:

Types of Hydrolysis

There are several types of hydrolysis, and we will look at them in brief below.

Salts: This is the most common type of hydrolysis. Hydrolysis of salts generally refers to the reaction of salt with water where it involves the interaction between cations or anions of salts and water. During hydrolysis, a salt breaks down to form ions, completely or partially depending upon the solubility factor.

Acid and Base: Acid–base-catalysed hydrolysis can be found during the hydrolysis of esters or amides. Here, the process of hydrolysis occurs when water or hydroxyl ion reacts with the carbon of the carbonyl group of the ester or amide where new compounds are formed. The products of both hydrolysis are compounds with carboxylic acid groups.

ATP: Most biochemical reactions that occur in living organisms are in the form of ATP hydrolysis which takes place with the help of enzymes acting as catalysts. The catalytic action of enzymes allows the hydrolysis or breaking down of proteins, lipids, oils, fats and carbohydrates.

Explanation:

Answer:

B 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d5

Explanation:

[tex]\huge{ \color{black}{ \boxed{ \color{hotpink}{Answer}}}}[/tex]

what is the chemical formula of (Sodium hydroxide ) ??

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Answer:

The formula of Sodinm hydroxide is NaOH

Hope it helps

Answer:

Putting it in water, and see the displacement of the water, or just measuring its weight and devide it by the gravitational pull

Answer:

i. 1 : 2

ii. NaOH is the limiting reagent

iii. 292.5g

iv. 59.69%

Explanation:

I have the detailed and self-explanatory workings. will snap and post later. Battery percent at 15%, flashlight not working.

1. The ratio of CuSO₄ to NaOH is 1 : 2

2. The limiting reactant is NaOH.

3. The mass of Cu(OH)₂ that will precipitate out is 292.5 g.

4. The percentage yield of Cu(OH)₂ is 59.7%

1. Determination of the ratio of CuSO₄ to NaOH.

CuSO₄ + 2NaOH —> Cu(OH)₂ + Na₂SO₄

From the balanced equation above, we can see that the ratio of CuSO₄ to NaOH is 1 : 2

2. Determination of the limiting reactant.

CuSO₄ + 2NaOH —> Cu(OH)₂ + Na₂SO₄

Molar mass of CuSO₄ = 63.5 + 32 + (16×4) = 159.5 g/mol

Mass of CuSO₄ from the balanced equation = 1 × 159.5 = 159.5 g

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of NaOH from the balanced equation = 2 × 40 = 80 g

From the balanced equation above,

159.5 g of CuSO₄ reacted with 80 g of NaOH.

Therefore,

638.44 g of CuSO₄ will react with = (638.44 × 80) / 159.5 = 320.22 g of NaOH.

From the calculations made above, we can see that a higher mass (i.e 320.22 g) of NaOH than what was given (i.e 240 g) is needed to react completely with 638.44 g of CuSO₄.

Therefore, NaOH is the limiting reactant.

3. Determination of the mass of Cu(OH)₂ that will precipitate out.

CuSO₄ + 2NaOH —> Cu(OH)₂ + Na₂SO₄

Molar mass of Cu(OH)₂ = 63.5 + 2(16 + 1) = 97.5 g/mol

Mass of Cu(OH)₂ from the balanced equation = 1 × 97.5 = 97.5 g

From the balanced equation above,

80 g of NaOH reacted to produce 97.5 g of Cu(OH)₂.

Therefore,

240 g of NaOH will react to produce = (240 × 97.5) / 80 = 292.5 g of Cu(OH)₂

Thus, 292.5 g of Cu(OH)₂ precipitated out of the reaction.

4. Determination of the percentage yield.

Percentage yield = (Actual /Theoretical) × 100

Percentage yield of Cu(OH)₂ = (174.6 / 292.5) × 100

Percentage yield of Cu(OH)₂ = 59.7%

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Answer:  Thermal energy is the kinetic energy of particles and heat is the term used to describe how this energy may flow to other systems, such as in a radiator.

Explanation:  Molecules have a level of kinetic energy that can be measured by temperature.  Higher temperatures result in more rapid and frequent collisons of particles in motion.  Heat is the term used to measure the quantity of vibration energy in a given system.  The SI unit for heat energy is the Joule.  The water molecules in a pot of boiling water have a kinetic energy sufficient for them to break away from other water molecules and become gaseous (boiling point).  The heat energy in 1 liter of water at 95C can be calculated in terms of Joules/liter, based on the specific heat of water (e.g., in units of J/gC).  This heat can flow to other systems.  A home boiler heater unit heats water tha can be pumped around the house ehre it will flow from radiators into thje surrounding air.

Heat is the word used to explain how this energy may transfer to other systems, such as in a radiator, and thermal energy is the kinetic energy of particles.

By virtue of its temperature, a system in a condition of thermodynamic equilibrium has thermal energy or internal energy. Unlike the energy of systems that are not in a state of thermodynamic equilibrium, thermal energy cannot be transformed into meaningful work as quickly.

For instance, the same fluid or solid in a thermodynamic equilibrium state with the same energy (as thermal energy) cannot do work unless it is combined with another substance at a different temperature, as in a heat engine. However, the same fluid or solid in a moving state with the same energy (as mechanical energy) can be converted to work in some mechanical device, such as a windmill or a waterwheel.

Therefore, heat is the word used to explain how this energy may transfer to other systems, such as in a radiator, and thermal energy is the kinetic energy of particles.

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Answer:

[tex]\boxed {\boxed {\sf 0.0455 \ L}}[/tex]

Explanation:

We are asked to calculate the liters given the molarity and moles in a solution.

Molarity is a measure of concentration in moles per liter. It is calculated with the following solution:

[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}[/tex]

The molarity of the solution is 4.40 molar of potassium chloride (KCl). 1 molar is equal to 1 mole per liter, so the molarity is also 4.40 moles of potassium chloride per liter. There are 0.200 moles of potassium chloride or solute. The liters of solution is unknown, so we can use the variable x.

[tex]4.40 \ mol \ KCl/ L = \frac{ 0.200 \ mol \ KCl}{x}[/tex]

Since we are solving for x, we must isolate the variable. First, cross multiply. Multiply the first numerator by the second denominator, then the first denominator and the second numerator.

[tex]\frac {4.40 \ mol \ KCl/ L}{1} = \frac{ 0.200 \ mol \ KCl}{x}[/tex]

[tex]4.40 \ mol \ KCl / L * x= 1 * 0.200 \ mol \ KCl[/tex]

[tex]4.40 \ mol \ KCl / L * x= 0.200 \ mol \ KCl[/tex]

x is being multiplied by 4.40 moles of potassium chloride per liter. The inverse operation of multiplication is division. Divide both sides by 4.40 mol KCl/L

[tex]\frac {4.40 \ mol \ KCl / L * x}{4.40 \ mol \ KCl / L}= \frac {0.200 \ mol \ KCl}{{4.40 \ mol \ KCl / L}}[/tex]

[tex]x= \frac {0.200 \ mol \ KCl}{{4.40 \ mol \ KCl / L}}[/tex]

The units of moles of potassium chloride cancel.

[tex]x= \frac {0.200}{{4.40 L}}[/tex]

[tex]x= 0.0454545454545 \ L[/tex]

The original measurements of liters and moles have 3 significant figures, so our answer must have the same. For the number we calculated, that is the ten-thousandth place (0.0454545454545). The 5 to the right of this place (0.0454545454545) tells us to round the 4 up to a 5.

[tex]x \approx 0.455 \ L[/tex]

There are approximately 0.455 liters in a 4.40 molar solution with 0.200 moles of solute.

Answer: One-Thousand of a cubic metre

Explanation:

One lire is the Volume of a cube with 10 cm sides

The conclusion that can be reached is ( C ) ; The reactant was a cyclic ether

When a particular ether is heated with HBr and it yields a single organic product the only reactant that can be used to achieve this from the options listed is, Cyclic ether. because the reaction between cyclic ether and HBr will produce a single product which consists of an alcohol group ( -OH group ) and a Bromide group on each ends.

While  reactants like symmetric ether will produce alcohol and alkyl bromide

Hence the conclusion that can be reached is that the reactant used was a cyclic ether

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In SO2 and SO3, oxygen combines with sulphur in a fixed ratio.

The law of multiple proportion states that if two elements combine with each other to form more than one chemical compound, then the various masses of the elements which combine with a fixed mass of the other element are in simple multiple ratios.

To illustrate this law, sulphur forms two oxides, SO2 and SO3. The ratio of the oxygen that combines with a fixed mass of sulphur  in the two compounds is 2:3 in accordance to the law of multiple proportion.

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Answer:

Since hydrogen has a single electron in its valence shell, it exhibits dual nature. of the periodic table, or it can obtain one electron to complete its valency of two, such as halogens from Group 17. Since it only has one electron in its outer shell, hydrogen has a dual existence.

Explanation:

This means that, like a normal halogen, a hydrogen atom can easily gain an electron to form a complete outer shell, or lose an electron to form an alkali metal. Since it already has two electrons in its outer shell, hydrogen can be diatomic, rendering it unreactive.

Answer:

I think you are moving fast my friend,but i don't remember Easter.

Answer:

yo fr i dont even remember last year christmas

Explanation:

Speed is defined as the distance travelled per unit time. Mathematically, it is expressed as:

[tex]Speed = \frac{Distance }{Time}[/tex]

To solve the question given above, we'll begin by converting 23.6 miles per hour to metre per second (m/s). This can be obtained as follow:

1 mph = 0.447 m/s

Therefore,

23.6 mph = 23.6 × 0.447

23.6 mph = 10.5492 m/s

Thus, 23.6 mph is equivalent to 10.5492 m/s

Finally, we shall determine the time taken for the racer to travel 20 m. This can be obtained as follow:

Speed = 10.5492 m/s

Distance = 20 m

[tex]Speed = \frac{Distance }{Time } \\\\10.5492 = \frac{20}{Time}[/tex]

Cross multiply

10.5492 × time = 20

Divide both side by 10.5492

[tex]Time = \frac{20}{10.5492 } \\[/tex]

Therefore, it will take 1.9 s for the racer to travel a distance of 20 m.

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Answer:

mass ,volume and density

Answer:

Cu(s) + 4HNO₃(aq) -> Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(l)

Answer:

The specific heat capacity affect heating rate by the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C).

Explanation:

Answer:

Option A is your answer

Explanation:

please mark as brainlyest

Answer:

I think the layers of the atmosphere does temperature increase with increasing height. It is affected by convection because it heats the lower atmosphere. It is affected by conduction because the is the transfer of thermal energy. I guess

Hope this help!

Answer:

gas lamp, led light, laser, inculding cfls andincandescent lights

Answer- 2.3

Explanition-

The density of hydrochloric acid is

1.49

g/mL

, and the mass is

3.5

g

. We need to use this information to find the volume of the acid. Since the above equation shows us the relationship between density, mass, and volume, we can rearrange the equation to find the volume:

Volume

=

Mass (g)

Density (g/mL)

=

3.5

g

1.49

g/mL

=

2.349

mL

The question asks for the answer to have the correct number of significant figures. Since solving this question requires division, the measurement with the least number of significant figures decides how many significant figures the final answer should have.

1.49

has three significant figures, while

3.5

has two significant figures. Therefore, the final answer for volume can have only two significant figures, which gives the final result as:

2.3

.

The density of compound is its mass divided by volume. The volume of 3.5 g hydrochloric acid with a density 1.49 g/ml is 2.34 milliliter.

Density of a substance is the measure of its mass per volume. Thus how much denser is it in a particular volume is represented by the physical quantity density.

Density of a compound is dependant on its mass, volume, temperature, bond type and pressure. The ratio of density of any object to the density of water is called specific gravity.

It is given that the mass of hydrochloric acid is 3.5 g and density is 1.49 g/ml. The volume of HCl solution can be calculated as follows:

Density = mass/volume

volume = mass/density

            = 3.5 g/1.49 g/ml

            = 2.34 ml.

Hence, the volume of HCl solution is 2.34 ml.

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Answer:

It might be responding variable.