how does the earth rotate?

Answer:

The answer is 2 significant figures.

1.90+2.3+5.700=9.9

Answer:

we use: V = pi*(r^2)*h

V = 3.14*(12.0cm^2)*44.0 cm

V = 19895.04 cm^3

Therefore, mass = (8.90g/cm^3) * (19895.04 cm^3) = 177065.856 g

Explanation:

A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, the mass of the cylinder is 180687.62g

Density is defined as the degree to which a material is packed together.

It is also defined as the measurement of the relative "heaviness" of objects with a fixed volume.

It is mass per unit volume.

Volume = ∧r²h

Volume = 3.14 x 12² x 44.9

             = 20301.98 cm³

Density = mass / volume

So, mass = density x volume

               = 8.90 g/cm³ x 20301.98

               = 180687.62 g

Thus, a copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, the mass of the cylinder is 180687.62g.

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Answer:

The mass percentage of iron in [tex]\rm K_3[Fe(CN)_6][/tex]  (potassium ferricyanide) is approximately [tex]17\%[/tex].

Explanation:

Start by finding the formula mass of potassium ferricyanide, [tex]\rm K_3[Fe(CN)_6][/tex], using relative atomic mass data from the question:

[tex]\begin{aligned} & M(\mathrm{K_3[Fe(CN)_6]}) \\ &\approx 3 \times 39 + 56 + 6 \times (12 + 14) \\ &= \rm 329 \; g \cdot mol^{-1}\end{aligned}[/tex].

In other words, every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units have a mass of approximately [tex]329\; \rm g[/tex].

On the other hand, note that there is one iron [tex]\rm Fe[/tex] atom in every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units. Hence, there would be exactly one mole of iron atoms in every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units. The mass of that one mole of iron atoms is approximately [tex]56\; \rm g[/tex] (again, from the relative atomic mass data of the question.)

Therefore:

[tex]\begin{aligned}& \text{Mass percentage of $\mathrm{Fe}$ in $\mathrm{K_3[Fe(CN)_6]}$} \\ &= \frac{\text{Mass of $\mathrm{Fe}$ in one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}{\text{Mass of one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}\times 100\% \\ &= \frac{M(\mathrm{Fe}) \times (\text{Number of $\mathrm{Fe}$ atoms in each $\mathrm{K_3[Fe(CN)_6]}$ formula unit)}}{M(\mathrm{K_3[Fe(CN)_6]})} \times 100\%\end{aligned}[/tex]

[tex]\begin{aligned}&\approx \frac{1 \times 56\; \rm g \cdot mol^{-1}}{329\; \rm g \cdot mol^{-1}}\end{aligned}[/tex].

Answer:

Explanation:

Density of a substance is given by

[tex]Density = \frac{mass}{volume} [/tex]

From the question

Density = 4.0 g/cm³

mass = 24g

Substitute the values into the above formula and solve for the volume

That's

[tex]4 = \frac{24}{v} \\4v = 24[/tex]

Divide both sides by 4

v = 6

We have the final answer as

Hope this helps you

Answer:

Examine the units: If the density is 1 g/mL, how many mL do you need to make 250 g?

X mL * 1 g/mL = 250 g

Solve for X

x mL = 250 g / 1 g/mL = 250 mL

Hope this helps :)

The volume of water = 250 L

[tex]density = \frac{mass}{volume}[/tex]

Given, density = 1.0 g/L = 0.001 kg/L

           mass = 250 g = 0.25 kg

Putting the values in the equation

[tex]0.001 = \frac{0.25}{volume}[/tex]

[tex]volume = \frac{0.25}{0.001}[/tex]

[tex]volume = 250 L[/tex]

Hence, the volume of the water is 250 L.

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Answer:

The correct option is;

b. The particles are positively and negatively charged, have high compressibility, and spread out to fill a container

Explanation:

Plasma are gases that contain positively and negatively charged particles. Therefore, plasma flow drift in space such that plasma. like gases has no characteristic shape or volume but takes the shape and fills the entire volume of a container in which it is placed

Other characteristics of plasma are that plasma is a conductor of electricity and magnetic fields can therefore exist in plasma due to the fact that plasma are made of atoms in which part or all of the electrons have been removed leaving the ions to roam freely in a container.

Answer:

The answers to your questions are given below

Explanation:

1. 3 Na2SO4

Molecules of Na2SO4 = 3

Na (sodium) = 3 x 2 = 6

S (sulphur) = 3 x 1 = 3

O (oxygen) = 3 x 4 = 12

2. 4 Pb(NO3)2

Molecules of Pb(NO3)2 = 2

Pb (lead) = 4 x 1 = 4

N (nitrogen) = 4 x 2 x 1 = 8

O (oxygen) = 4 x 3 x 2 = 24

Answer:

A

Explanation:

Answer:

No, air is not a good conductor of electricity.

It is poor conductor.

Answer:

International System of Units

Definition: A system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten.

Hope this helps!

Answer: there is not any correct answer but the law of conservation of matter states that the sum of the mass of the reactants should be equal to that of the product

Mixtures can always be separated again into component pure substances, because bonding among the atoms of the constituent substances does not occur in a mixture. Whereas a compound may have very different properties from the elements that compose it, in mixtures the substances keep their individual properties.

Explanation:

Answer:

147.5 grams

Explanation:

Let the required mass of ground beef be m .

protein in it = .213 m

fat in it = .169 m

1 gram of protein gives 4 cals .

1 gram of fat gives 9 cals .

cals given by .213 m protein = 4 x .213 m .

cals given by .169 m fat  = 9 x .169 m .

4 x .213 m  + 9 x .169 m = 350

.852 m + 1.521 m = 350

2.373 m = 350

m = 147.5 grams Ans

Answer:

This question is incomplete

Explanation:

This question is incomplete.

However, when all the required data are available, you can use the formula/steps below

Average speed/velocity (m/s) = distance (in metres) ÷ time (in seconds)

Time (in secs) = distance ÷ average speed/velocity

Kindly note that "blocks" is not a standard unit for distance measurement in science, hence the distance (since its a walking distance) must be in metres (or converted to metres if not in metres).

The distance in the formula is the distance from the hotel to the ice cream shop while the average speed is the distance covered per time as s/he walks to the ice cream shop and back. Hence, the answer gotten from the formula above will have to be multiplied by 2 (in order to get the time taken to walk to the ice cream shop and back) because the formula will only provide answer to one trip (time taken to walk to the shop).

After the multiplication mentioned above, the time in seconds should be converted to minutes by dividing the answer in seconds by 60

Answer:

Explanation:

given volume =5.3 litres

as we know that 1 litre =1 dm3

therefore 5.3 litres =5.3 dm3

now moles =given mass /molar mass

so mass =moles*molar mass

in order to find mass of carbon we need to find moles

therefore moles=given volume/standard volume  standard volume at STP is 22.4 dm3

moles= 5.3/22.4

moles=0.236=0.24

now mass of carbon dioxide =moles*molar mass

mass = 0.24*44

mass=10.56kg

Metric relationships 103 ml = 1l, 1g = 102 centigrams and 1g = 103 kilograms are incorrect.

Metrics are a system which is based on decimal values and is used to measure the given quantity. It can be used to measure the length, volume, mass, time, speed, distance etc.

A metric quantity of mass that is equivalent to one thousand grams A mass of one kilogram weighs a little over two pounds.

Hence, option C, D and E are the incorrect options.

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Answer:

0.745 millimiters

i looked it up on google and this is the right answer

Answer:

[tex]a=64.7mg[/tex]

Explanation:

Hello,

In this case, we need to remember that for the required time for a radioactive nuclide as radium-226 to decrease to one half its initial amount we are talking about its half-life. Furthermore, the amount of remaining radioactive material as a function of the half-lives is computed as follows:

[tex]a=a_0(\frac{1}{2} )^{\frac{t}{t_{1/2}} }[/tex]

Therefore, for an initial amount of 100 mg with a half-life of 1590 years, after 1000 years, we have:

[tex]a=100mg(\frac{1}{2} )^{\frac{1000years}{1590years} }\\\\a=64.7mg[/tex]

Best regards.

Answer:

The new volume of the sample is halved.

Explanation:

Data obtained from the question include the following:

Initial volume (V1) = V

Initial temperature (T1) = T

Initial pressure (P1) = P

Final pressure (P2) = quadrupled = 4P

Final temperature (T2) = doubled = 2T

Final volume (V2) =?

Thus, we can obtain the new volume of the same by using the combined gas equation as shown below:

P1V1 /T1 = P2V2 /T2

P × V/T = 4P × V2/2T

Cross multiply

T × 4P × V2 = P × V × 2T

Divide both side by T × 4P

V2 = (P × V × 2T) / (T × 4P)

V2 = V/2

V2 = ½V

Therefore, the new volume of the sample is halved .

Answer:

Below

Explanation:

Balanced form;

[tex]2C_6H_6 +15O_2 -> 12CO_2+6H_2O\\\\ Ca_3(PO_4)_2 +8C -> Ca_3P_2 +8CO\\\\2HNO_2+O_2 -> 2HNO_3\\\\Ca(OH)_2 + CO_2 -> CaC0_3+H_2O\\\\2K +Br_2 ->2KBr\\\\2NaOH+FeSO_4 -. Na_2SO_4 +Fe(OH)_2[/tex]

1.Benzene + Dioxygen = Carbon Dioxide + Water

2.Tricalcium phosphate +Carbon = Calcium phosphide + carbon monoxide

3.Nitrous acid react with oxygen to produce nitric acid.

4.This means that the carbon dioxide and limewater react to produce calcium carbonate and water.

5.Potassium react with bromine to produce potassium bromide

6. An aqueous solution of ferrous sulphate reacts with aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in the solution.

Answer:

3 significant numbers

Answer:A

Explanation:

Answer:

Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up. So true.

Hope this helps! （づ￣3￣）づ╭❤～

Answer:

There is no limitation at all because that is the basic theory of solution electrolysis

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Limitation of Bronsted Lowey concept:

✭It doesn't describe the acidic and basic nature of organic compound.

✭It also doesn't describe the acidic, basic as well as amphoteric gaseous molecule.

✭According to Bronsted Lowery concept same compound in one reaction act as acid and another reaction act as base so, it is difficult to predict the exact acid or base.

Answer:

A bond in which valence electrons are shared is called COVALENT.

HYDROLYSIS is the process of breaking large molecules into smaller ones by adding water.

If energy is released when a molecule is broken apart, it is an EXERGONIC REACTION.

The process of building up large molecules from small components is an ANABOLIC process.

A lipid with four sites lacking hydrogen saturation is a POLYUNSATURATED lipid.

Answer: The universe consists of all the energy made by the Sun and stars. The universe consists of all physical objects on Earth and in space. The universe consists of all matter and energy. The universe consists of solar systems which contain galaxies.

Explanation:  That's because the Universe does consists of all the energy made by the Sun and Stars. That is how we get our energy is from the Sun and Stars, and the Solar System contains Galaxies.

Answer:

ΔH° = + 6.2 kJ

Explanation:

Fe₂O₃(s) + 3CO(g) –––––> 2 Fe(s) + 3 CO₂(g);        ΔH° = –26.8 kJ  ......... ( 1 )

  FeO(s) + CO(g) –––––> Fe(s) + CO₂(g);                  ΔH° = –16.5 kJ  .........( 2 )

   Multiplying equation ( 2 ) by 2 and subtracting it from ( 1 )

  Fe₂O₃(s) + 3CO(g) -2 FeO(s) -  2CO(g) ––> 2 Fe(s) + 3 CO₂(g) - 2Fe(s) -           2CO₂(g)              ΔH° = –26.8 kJ  -  ( 2 x –16.5 kJ )

Fe₂O₃(s) + CO(g) -2 FeO(s)––>  CO₂(g)              ΔH° = –26.8 kJ + 33 kJ

Fe₂O₃(s) + CO(g) ––>2 FeO(s) +CO₂(g)               ΔH° = + 6.2 kJ

Required   ΔH° = + 6.2 kJ       Ans .