Calculate the mass of potassium hydroxide, KOH, required to prepare 174.59 cm3 of a 0.864 mol dm-3 solution.

The machine is accurate and precise

Hence , option D is correct one .

Accuracy is the capacity of an instrument to measure the precise value. In other words, it refers to how closely the measured value resembles a reference or genuine value. Small readings can be taken to increase accuracy. The calculation's inaccuracy is decreased by the little reading.

The precision of a substance is defined as the degree to which two or more measurements agree with one another. It is incredibly precise but not always accurate to measure something if you weigh it five times and get 3.2 kg each time. Accuracy is not necessary for precision.

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Answer:

it's Heisenberg Einstein

Explanation:

Heisenberg Einstein & other scientists

Electrons move around the nucleus billions of times in one second. There are small, negatively charged particles inside an atom called electrons. “Atomos” means “not to be cut,” which refers to the smallest piece of matter.

Answer:

Heisenberg Einstein

Explanation:

they where the main one but there where a few others who agreed

c) Chemical, Combustibility/Reaction Iron reacts with Sulphur to give heat and a flame.

Iron sulphide, a chemical, is created when you burn iron and sulphur together. A series of chemical compounds comprised of iron and sulphur is referred to as iron sulphide, or simply iron sulphide. The chemical molecule and mineral known as iron sulphide, sometimes known as iron(II) sulphide, has the formula FeS.

Incandescence is the process of a solid emitting light after being heated till it glows or emits light. The colour of an iron bar when warmed to a very great temperature changes from red to white as the temperature increases.

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The mass of the solid will be 114.7 g.

The density of a substance is given as the ratio of its mass and its volume.

Also, a solid will always displace its own volume in a liquid.

Mass of liquid solvent = 47.3 g

Density of liquid solvent = 0.865 g/mL

Recall that: density = mass/volume

Volume of liquid solvent = mass/density

                                     = 47.3/0.865

                                      = 54.7 mL

Volume of solid + liquid solvent = 90.0 mL

Volume of solid = 90.0 - volume of liquid solvent

                            = 90.0 - 54.7

                               = 35.3 mL

Density of solid = 3.25 g/mL

Mass of solid = density x volume

                       = 3.25 x 35.3

                          = 114.7 g

The mass of the solid is 114.7 g.

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An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.

The mass of an atom is mainly due to its protons and neutrons in the nucleus.

Weight of a proton is 1.6 x 10^-27 kg

Weight of a neutron is 1.6 x 10^-27kg

However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu

A chlorine atom has 17 protons in its nucleus and 18 neutrons in its nucleus

Its atomic number is 17

Amu weight of Cl= weight of protons+ weight of neutrons

        =17+18

        =35amu

Hence the average atomic mass unit of chlorine atoms will be 35 amu

Disclaimer:

The value is taken for easier calculation and is not accurate upto 3 decimals

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Maalox is the trade name for an antacid and antigas medication used for relief of heartburn, bloating, and acid indigestion in which

4 ml contains

= 320mg of aluminum hydroxide

= 320mg of magnesium hydroxide

= 32mg of simethicone

recommended doses = 4 times * 2 tea spoon = 8 tea spoon/ day

given = 1 tea spoon = 5 ml

8 tea spoon = 40 ml

hence,

amount of aluminum hydroxide = 320/4 * 40 = 3200mg = 3.2 g

amount of magnesium hydroxide = 320/4 * 40 = 3.2 g

amount of  simethicone = 32/4 * 40 = 320 mg = 0.32g

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The true statement about a molecule is that all molecules of a compound have the same properties and is therefore denoted as option C.

This is referred to as the smallest unit of matter without the release of electrically charged particles which include proton, electron etc.

Atoms combine together to form molecules and they are involved in the formation of chemical compounds such as NaCl etc. It consists of identical molecules which means that all of them have the same properties which is therefore the reason why option C was chosen as the most appropriate choice.

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Answer:

All molecules of a compound have the same properties.

Explanation:

Gallium is the element that belongs to the group 3 and the fourth period. Ga is symbol of Gallium.

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Answer: false

Explanation: A model is a representation of a more complex system

Answer: [tex]2.00x10^{2}[/tex]

Explanation: 1 gram is equal to 1000 Milligrams so

[tex]0.00200g=\frac{1000mg}{1g}[/tex]

Since you go straight across its just multiplication so 0.00200x1000=200mg

To answer it in scientific notation it should just be [tex]2.00x10^{2}[/tex] mg

Answer:

Explanation:density=mass×volume

so your answer will be 14.7×6.6=97.02

There will be 0.39 moles

Take a look at the He gas in the tank:

P = 2.80 atm, or pressure

Volume = 5.00 liters.

T = (273 + 155) is the temperature. K = 428 K

R = 0.08206 L atm/L of gas (mol K)

Charle's law, Boyle's law, and Gay-Lussac law are the three gas laws that make up the combined gas law, commonly referred to as a general gas equation. For a certain amount of gas, the law illustrates the relationship between temperature, volume, and pressure.

Gas law PV = nRT

So, n = PV/. (RT)

He gasses number = 2.80 x 5.00 / (0.08206 x 428) mol equals 0.39 mol.

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If the engines in both airplanes are at the same weight, the engines in both airplanes would still have the same mass because mass is constant everywhere.

Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration (change of velocity) when a net force is applied.

In the question, the same type of engine is placed in two different air-planes of which the first airplane is twice as heavy as the second.

We can then conclude that the  correct statement about the mass of the airplane and its acceleration, assuming a constant net force is that Increasing the acceleration of the air-plane causes the engine to provide more force.

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The answer would be RCH2COCH2R is more polar than RCH2(OH)R

The formic acid ( RCH2COCH2R ) is more polar than Pyridinium Chlorochromate (PCC) (RCH2(OH)R) because formic acid is from aldehyde group and is a reagent from a carbonyl group and PCC is react to form carbonyl group it's also an reagent which reacts in oxidation of alcohols.

The polarity is more which is a carbonyl compound as their electrons are loosely prepared. And also the polarity of formic acid is 6.0.

Hence, the formic acid (RCH2COCH2R) is more polar than Pyridinium Chlorochromate (RCH2(OH)R) (PCC).

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The number of mole of CaCO₃ in antacid tablet containing 0.512 g of CaCO₃ is 5.12×10⁻³ mole

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

From the question given above, the following data were obtained:

The number of mole in 0.512 g of CaCO₃ can be obtained as follow:

Mole = mass / molar mass

Mole of CaCO₃ = 0.512 / 100

Mole of CaCO₃ = 5.12×10⁻³ mole

Thus, 5.12×10⁻³ mole of CaCO₃ is present in the antacid tablet

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The specific heat capacity of a substance, also known as the massic heat capacity or massic heat capacity in thermodynamics, is the heat capacity of a sample of the substance divided by the mass of the sample. So, the energy gain by sample will be 506J

We know that, the heat energy gained will be calculated by the formula,

Q=mcΔT

where,

Q= Heat energy gained

m=mass

c= specific heat capacity

ΔT= Change in temperature

So, Given,

m= 5.00g ,

ΔT= 419K -306K= 113K

c= 0,897J/gK

Q=mcΔT

Q= 5.0×0.897×113

Q= 506J

So, the energy gained by sample of Aluminum will be 506 J when it is warmed from 306 K to 319K , in which temperature difference is 113K

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The reaction that will occur at the same time as the formation of ferric hydroxide will be [tex]Fe(OH)_3 + 3HCI --- > FeCl_3 + 3H_2O[/tex].

A reversible reaction is a reaction that proceeds both forward and backward at the same time.

In other words, it is a reaction in which as the reactants react to form products, the products simultaneously react to form reactants.

Thus, looking at the original forward reaction:

[tex]FeCl_3 + 3H_2O --- > Fe(OH)_3 + 3HCI[/tex]

Ferric chloride reacts with water to form ferric hydroxide and hydrochloric acid. Since the reaction is reversible, the ferric hydroxide and hydrochloric acid formed will simultaneously be reacting to form the reactants.

In other words, the reaction that will occur at the same time as the formation of ferric hydroxide will be:

[tex]Fe(OH)_3 + 3HCI --- > FeCl_3 + 3H_2O[/tex]

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Answer:

It is dangerous because it can be harder to drive the car.

Explanation:

Any alterations in your car can void some of your warranties and may also pose some safety concerns. It is also illegal as well.

Answer:

0.1295 m^2

Explanation:

just divide 1295 by 10000

The empirical formula of the carboxylic acid is C₃H₆O₂.

For determination of the empirical formula of the carboxylic acid.

As you know, one mole of water, contains 2 moles of hydrogen. This means that the percent composition of hydrogen in water will be

2× 1.00794 g/mol / 18.015 g/mol × 100 = 11.19% H

What this means is that every 100 g of water will contain  11.19 g of hydrogen. In your case, the 0.2349-g  sample of water will contain  

0.2349 g water⋅ 11.19 g H / 100 g water = 0.026285 g H

Similarly, one mole of carbon dioxide, CO₂, contains one mole of carbon. The percent composition of carbon in carbon dioxide will be

1 ×12.011 g/mol / 44.01 g/mol × 100 = 27.29% C

Once again, this tells you that every 100 g of carbon dioxide will contain

27.29 g of carbon. In your case, you will have

0.5706g H₂O ⋅ 27.29 g C /100g H₂O = 0.15572 g C

The mass of carbon + hydrogen originally present in the carboxylic acid sample will be

m C + H = 0.026285 g + 0.15572 g =0.18201 g

The initial mass of the sample was equal to 0.3200 g. This tells you that the sample also contains oxygen

m oxygen = 0.3200 g −0.18201 g = 0.13799 g O

So, now that you know how many grams of each element were present in the initial sample, use their molar masses to convert these to moles

For C: 0.15572g /12.011g/mol = 0.012965 moles C

For H:  0.026285 g/1.00794g/mol = 0.026078 moles H

For O:  0.13799g/15.9994g/ mol = 0.0086247 moles O

Now, to get the compound's empirical formula, you need to find the smallest whole number ratio that exists between the number of moles of each element in the compound.

To do that, divide these values by the smallest one to get

For C:  0.012965 moles / 0.0086247 moles = 1.5032 ≈ 1.5

For H: 0.026078moles /0.0086247 moles =3.0236≈ 3

For O:  0.0086247moles /0.0086247 moles = 1

This means that you have

C₁.₅H₃O₁

Since you're looking for the smallest whole number ratio that exists between the elements, multiply each subscript by 2 to get

C₁.₅H₃O₁ * 2 = C₃H₆O₂

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1. The number of mole of 54.5 dm³ of CH₄ at STP is 2.43 moles of CH₄

2. The number of mole of 250 cm³ of CO at STP is 0.01 mole

At standard temperature and pressure (STP),

1 mole of gas = 22.4 dm³ = 22400 cm³

At standard temperature and pressure (STP),

22.4 dm³ = 1 mole of CH₄

Therefore,

54.5 dm³ = (54.5 dm³ × 1 mole) / 22.4 dm³

54.5 dm³ = 2.43 moles of CH₄

At standard temperature and pressure STP,

22400 cm³ = 1 mole of CO

Therefore,

250 cm³ = (250 cm³ × 1 mole) / 22400 cm³

250 cm³ =0.01 mole of CO

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The volume of the hole inside the ball is 359.27 cubic inches if the spherical iron ball has a diameter of 11.6 cm and a mass of 3.60 kilograms.

It is defined as three-dimensional geometry when half-circle two-dimensional geometry is revolved around the diameter of the sphere that will form.

[tex]\rm V = \dfrac{4}{3} \pi r^3[/tex]

The volume of the sphere V = (4/3)πr³

The diameter d = 11.6 cm

The radius r = 11.6/2 = 5.8 cm

The volume of the sphere V = (4/3)π(5.8)³

V = 817.28 cubic cm

As we know,

The density d = mass/volume

7.86 = 3600/volume

Volume = 458.01 cubic cm

The volume of the hole inside the ball  = 817.28 - 458.01

= 359.27 cubic inches

Thus, the volume of the hole inside the ball is 359.27 cubic inches if the spherical iron ball has a diameter of 11.6 cm and a mass of 3.60 kilograms.

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When the electrons get excited it move from lower level to higher energy level and gain energy but when electrons pumped back to there lower energy level the excess energy get emitted as light.

Electron transition can be defined as when an atoms or molecules absorbs radiation there electron get excited and jump from lower energy level to higher energy level and when an atom or molecule emit radiations energy it come back to its original place i.e. to the lower energy state.

Electron transition is based on Franck-Codon principle.

According to this principle electron transition occur without changes in position of there nuclei in the molecular entity and its environment.

Thus, when the electrons get excited it move from lower level to higher energy level and gain energy but when electrons pumped back to there lower energy level the excess energy get emitted as light.

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Answer: 94,608,000 seconds

Explanation:

365 days/1 yr=365

24 hours/1 day=24

60 min/1 hour=60

60 sec/1 min=60

365*24*60*60=

8760*3600=31536000 seconds in 1 year.

31536000*3=94608000 seconds

It cost $35.57 to drive the school bus for 94.00 miles.

Given:

Distance to drive (D) = 94.00 miles

Miles per gallon (MPG) = 6.500 miles/gallon

Cost of gas (C) = $2.459/gallon

Step 1: Calculate the amount of gas required for the trip.

Gas consumed = Distance / Miles per gallon

                          = 94.00 miles / 6.500 miles/gallon

                          = 14.4615 gallons

Step 2: Calculate the cost of gas for the trip.

Cost of gas = Gas consumed * Cost per gallon

                    = 14.4615 gallons * $2.459/gallon

                    = $35.57

Therefore, it will cost $35.57.

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Answer: Heat energy (Q) added is 3150 (J) .

Explanation:

Taking into account the rule of three, you can drive your new Prius hybrid a distance of 868 miles.

Rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

If the relationship between the magnitudes is direct, the direct rule of three must be applied as follow, being a, b and c known data and x the variable to be calculated:

a ⇒ b

c ⇒ x

So: x= (c×b) ÷a

In this case, you can apply the following rule of three: If the car for 1 gallon of gasoline gets 56 miles, for 15.5 gallons of gasoline it gets how many miles?

1 gallon ⇒ 56 miles

15.5 gallons ⇒ x

So: x= (15.5 gallons ×56 miles) ÷1 gallon

Solving:

x= 868 miles

In summary, you can drive your new Prius hybrid a distance of 868 miles.

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Answer:

A substance is considered a chemically pure substance when it has a fixed chemical composition throughout, and uniform physical and chemical properties. Because isopropyl alcohol ( C3H8O ) Is a homogenous compound with constant physical and chemical properties, as well as a uniform chemical structure, isopropyl alcohol is definitely fit to be considered a pure substance.