state two things you notice when a metal is touched

Answer:

A

Explanation:

Answer:

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

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Answer:

The volume of the steel is 10cm3

Explanation:

Density is defined as the mass contained per unit volume.

Density= Mass

volume

Given : Mass of steel = 80 grams

Density of steel = 8g/cm3

Putting in the values we get:

8g/cm3 = 80g

Volume

Volume=80/8

=10

Thus the volume of steel is 10cm3

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the volume of  sample of steel is 10cm³  if the density of his sample of steel is 8 g/cm³.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically, the formula for density can be given as

Density = Mass of the metal  ÷volume marked on the graduated cylinder

Mass of steel = 80 grams

Density of steel = 8g/cm³

substituting all the given values in the above equation, we get

Volume of steel=80/8

On calculations, we get

Volume of steel  =10cm³

Therefore, the volume of  sample of steel is 10cm³.

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Answer: nitrogen

Explanation:

Thus, the s subshell may contain only one orbital and the p subshell may contain three orbitals. Each orbital has its own distinct shape. An s orbital found in a s subshell is spherical, p orbitals found in p subshells are two-lobed, and d orbitals found in d subshells are four-lobed.

Answer:

The s-subshell may contain only one orbit and the p-subshell may contain three orbits . Each orbit has it own distinct shape

May this helps you

Answer:

The answer is 2 significant figures.

1.90+2.3+5.700=9.9

Answer:

-

Alcohol-related diseases frequently cause low Mg+ levels.

- Mg+ deficiencies must be treated before potassium (K+) deficiencies.

- Mg+ deficiencies often result in low serum potassium (K+)

- Mg++ levels present similarly to calcium (Ca++) levels in the blood.

- Vomiting is not generally seen as a major cause of Mg+ loss

Answer:

D. Molecules in bromine and air moved randomly  

Explanation:

The molecules of both bromine and air are in the gas phase.

Since the molecules of gases are far apart and moving randomly, the bromine and air molecules can easily mix together.

A is partially correct. bromine is denser than air, but that doesn't explain why they mix.

B is wrong. Bromine is denser than air.

C is partially correct. The molecules of bromine and air moved upwards and downwards, but the also moved randomly in many other directions.

Answer:

A) mL / s

Explanation:

Answer:

true.................

Answer:

Thermal energy that is transferred from one substance to another,moves from warmer to cooler objects. So True.

Explanation:

Answer:

The heat of solution of the compound = 42.75 kJ/mol

Explanation:

Here we have;

The heat of vaporization = 21.99 kJ/mol

2.56 g of the compound is then placed in 200 g. of water

The temperature of the water reduces from 68.25°C to 67.91°C

The specific heat capacity of water = 4.19 kJ/kg = 4.19 J/g

Mass of the water = 200 g

Heat lost by the water ΔH = m × c × Δθ = n × ΔH vaporization of the compound

Where;

m = The mass of the water = 200 g

c = The specific heat capacity of water = 4.19 kJ/kg = 4.19 J/g

Δθ = The change in temperature = 68.25°C - 67.91°C = 0.34°C

n = The number of moles of the compound

ΔH = m × c × Δθ = 200×4.19×0.34 = 284.92 J = 0.28492 kJ

∴ n × ΔH vaporization of the compound = 0.28492 kJ

n = 0.28492 kJ/( ΔH vaporization of the compound) = 0.28492/21.99≈0.013 moles

∴ 2.56 g = 0.013 moles

1 mole = The molar mass of the compound = 2.56/0.013= 197.6 g/mol

Therefore;

The number of moles in 55.6 g of the compound = 55.6/197.6 = 0.2814 moles

The heat given by the water = ΔH = 495 × (25.2 - 19.4) × 4.19 = 12029.49 J

Therefore;

0.2814 × ΔH(solution) = 12029.49 J = 12.02949 kJ

ΔH(solution) = 12.02949/0.2814 = 42.75 kJ/mol

The heat of solution of the compound = 42.75 kJ/mol.

Answer:

0

Explanation:

Positive Change of 2 cancels the negative charge of 2

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the overall charge of atom that contains 2 electron and 2 proton is zero.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The overall charge of atom that contains 2 electron and 2 proton is zero.

Therefore, the overall charge of atom that contains 2 electron and 2 proton is zero.

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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:

a) 0.154 moles of N2

b) 9.27 × 10^22 molecules

c) 4.312 g

Explanation:

a)

1 mole of N2 contains 6.02 × 10^23 atoms

x moles of N2 contains 9.26 × 10^22 atoms

x= 9.26 ×10^22/6.02 × 10^23

x= 1.54 ×10^-1

x= 0.154 moles of N2

b)

1 mole of N2 contains 6.02 × 10^23 molecules

0.154 moles of N2 contains 0.154 moles × 6.02 × 10^23 = 9.27 × 10^22 molecules

c)

Molar mass of the nitrogen gas= 28 gmol^-1

Number of moles of nitrogen gas = 0.154 moles

Number of moles = mass/molar mass

0.154 moles= mass/28 gmol^-1

Mass= 0.154 moles × 28gmol^-1

Mass= 4.312 g

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:

32.567+135.0+1.4567=169.027

to significant figures is 16

Answer:

0.745 millimiters

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

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

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:

B. PEA = KEC. +PEC

Explanation:

From the figure it is clear that there is interconversion between potential energy ( PE ) and kinetic energy ( KE ) , so that total mechanical energy is conserved .

At A only potential energy exists . Kinetic energy is zero .

At B only kinetic energy exists . Potential energy is zero .

At C both potential and kinetic energy exist .

So Potential energy at A is equal to potential energy at C and kinetic energy at C

Ie , PEA = KEC + PEC .

Option B is correct .

Answer:

250 g

Explanation:

Answer:

In science, you are looking for something and you discovered something else. This leads to many discovery among the world.

Answer:

For a mild human cough in air at 20 °C and 50% relative humidity, we found that ... larger droplets are dispersed into smaller ones gradually while moving away from the ... Complex phase change and transport phenomena such as evaporation and ... Natural Ventilation for Infection Control in Health-Care Settings

Explanation

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

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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: 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

Answer:

F=ma.

mass=77, acceleration=2.3.

77×2.3=177.1Newton

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