FIRST ONE TO RESPOND CORRECTLY GET BRAINLESS

Answer:

chemical change, because you are changing the actual molecules into differerent substances in a chemical way

Explanation:

Answer:

tissue is made by a group of cells

Answer:

cells

Explanation:

taking the test =)

Answer:

1).

[tex]speed = \frac{distance}{time} \\ speed = \frac{100}{4} \\ speed = 25 {ms}^{ - 1} [/tex]

2).

[tex]time = \frac{distance}{speed} \\ time = \frac{225}{75} \\ time = 3 \: s[/tex]

Answer:

it's a precipitation reaction.

Explanation:

since a solid is produced, one of the elements are insoluble with one another–making a precipitate.

Answer:

Explanation:

Combustion of coal releases carbon as CO2. Phytoplankton remove carbon dioxide from the atmosphere by photosynthesis. Carbon is passed along the food chain as fish eat the plants. Penguins feed on the fish, taking in the carbon compounds containing the original carbon atom.

The carbon atoms in coal end up in a penguin due to the process of food chain.

Penguins are aquatic flightless birds that are found in the Southern Hemisphere.

The food chain leads to the carbon atom into the penguin.

The carbon atoms are release from the coal combustion.

The released atoms go into plants leaves.

The herbivorous eat plants.

Then the carnivorous eats the herbivorous.

The carnivorous can be a fish and fish are eaten by penguins.

Thus, in this way, the carbon atoms in coal end up in a penguin due to the process of food chain.

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Answer:

They repel due to a force of repulsion

Answer:

A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.

This is true because entropy increase when gas particles spread

Explanation:

Answer:

False

Explanation:

Answer:

m = 673 g

Explanation:

We need to find the mass of 5.90 mol of [tex]C_8H_{18}[/tex]

Molar mass of [tex]C_8H_{18}[/tex] is:

[tex]M=8\times 12+1\times 18\\\\=114\ g/mol[/tex]

Let m be the mass of 5.90 mol of [tex]C_8H_{18}[/tex]. Using mole concept to find it.

No of moles = mass/molar mass

[tex]m=5.9\times 114\\\\=672.6\ g\\\\\approx 673\ g[/tex]

So, the required mass is 673 g. Hence, the correct option is (d).

Answer:

673 g

Explanation:

Answer:

D

Explanation:

Answer:D:Boiling

Explanation:

Answer:

False, hope this helps :)

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 71.84g is the mass of  0.780 moles of  calcium cyanide.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically, the formula for mole can be given as

mole of  calcium cyanide=given mass of  calcium cyanide ÷ molar mass of  calcium cyanide

number of mole of  calcium cyanide=   0.780 moles

mass of  calcium cyanide=?

molar mass of  calcium cyanide=92.1128 g/mol

Substituting the values in above formula we get

0.780 moles  = mass of carbon  ÷92.1128 g/mol

On calculations, we get

mass of  calcium cyanide=71.84g

Therefore, 71.84g is the mass of  0.780 moles of  calcium cyanide.

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Answer:

one atom of carbon dioxide and two atoms of oxygen = CO2

hope this answer will help you

Answer:

b I beleive

Explanation:

the shape of a liquid changes based on the container it is in, but the volume stays the same

Answer:

Option B

Explanation:

The volume of Carbon dioxide : 29.12 L

Given

CH4 (g) + 202(g) → CO2(g) + 2H2O(g)

Oxygen volume = 63.3 L

Methane volume = 29.2 L

The volume of Carbon dioxide

Solution

1 mol gas at STP = 22.4 L

mol methane :

[tex]\tt \dfrac{29.2}{22.4}=1.3[/tex]

mol oxygen :

[tex]\tt \dfrac{63.3}{22.4}=2.83[/tex]

limiting reactant : CH₄(smaller ratio:mol/reaction coefficient)

So mol CO₂ based on CH₄

From equation, CO₂ : CH₄ = 1 : 1, so mol CO₂ = 1.3

The volume =

[tex]\tt 1.3\times 22.4=29.12~L[/tex]

The volume of carbon dioxide is produced in the reaction is 29.12 L

We know that

1 mol gas at STP = 22.4 L

So,

The mol methane is

[tex]= 29.2 \div 22.4\\\\= 1.3[/tex]

Now

The  mol oxygen is

[tex]= 63.3 \div 22.4\\\\= 2.83[/tex]

Now the volume is

[tex]= 22.4 \times 1.3[/tex]

= 29.12 L

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Answer:

23.77mole,85.1g/mol

Explanation:

the moles of liquid is 23.77mole which is obtained by divide 90.6kj to 3.811kj/mol and molar mass is obtained from the formula of mole eg mole=mass/molar mass but mass is given and moles is obtained above.

When the molar mass of the significance of the mass of the sample is 2022 g is = 23.77mole, 85.1g/mol.

When the molar mass of a chemical combination is defined as the mass of a sample of that compound separated by the amount of substance in that instance, measured in moles.

Although, The molar mass is a bulk, not molecular, property of a substance. The molar mass is an average of many instances of the combination, which often change in mass due to the existence of isotopes.

When the moles of liquid is 23.77mole which is received by dividing 90.6kj to 3.811kj/mol and molar mass is acquired from the formula of mole eg mole is = mass/molar mass but the mass is given and moles is conveyed above.

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Answer:

0.45881381335

Explanation:

divide 45 by the molar mass of H2SO4

45/98.079

Answer:

0.45

Explanation:

divise

Answer:

125 lbs would round to C. 56.8kg

Answer:

Explanation:

In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.

X-rays are neutral and cannot be bent in a magnetic field. The new radiation was bent by the magnetic field so that the radiation must be charged and different than x-rays.

Explanation:

Chemical formula of chloride of metal M is MCl₃

We know that Cl has valency 1.

nowzl, it's cleared that M had valency 3.

Bcz the after criss-cross it forms MCl₃.

Now,

Chemical formula of bicarbonate:

we know that bicarbonate has its valency/charge 1

So, after criss-cross the formula of metal bicarbonate is M(HCO₃)₃

Chemical formula of sulphide:

we know that sulphide has its valency/charge 2

So, after criss-cross the formula of metal metal is M₂S₃

Answer: Jump to Active Metal Reactions with Oxygen · The method used to predict the products of reactions of the main group metals is simple, yet remarkably powerful. Exceptions to its predictions arise, however, when very active metals react with oxygen, which is one of the most reactive nonmetals. It reacts with O2 to form an oxide that contains the O2- ion.

Answer:

wavelength λ =  35.92 pm

Explanation:

Given that:

The glancing angle (θ) = 10.42°

Bragg reflection n = 1

wavelength λ = ???

diameter d = 99.3 pm

Using the formula:

nλ = 2dsinθ

we have:

1 × λ = 2 × ( 99.3) × sin (10.42°)

λ =  198.6 × 0.18086

λ =  35.92 pm

The wavelength of the X-rays that is used is equal to 35.9 nanometers.

Given the following data:

To calculate the wavelength of the X-rays that is used, we would apply Bragg's law of reflection:

Mathematically, Bragg's law of reflection is given by the formula:

[tex]n\lambda = 2dsin\theta[/tex]

Where:

Substituting the given parameters into the formula, we have;

[tex]1 \times \lambda = 2 \times 99.3 \times 10^{-11} \times sin(10.42)\\\\ \lambda = 1.99 \times 10^{-9} \times 0.1809\\\\\lambda = 3.59 \times 10^{-10}[/tex]

Wavelength = 35.9 nanometers.

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Answer:

3 i believe

Explanation:

Answer: 3

Explanation: I took the test!!!

Answer: The options are not given, here are the options.

1.Sulfur.

2. Mercury.

3. Copper.

4. Sodium.

5. Magnesium.

The correct answer is sodium.

Explanation:

It is sodium because sodium is a chemical element with the symbol Na and it has atomic number 11. It is an akali metal, it is soft, slivery and does not occur free in nature.it is found in compound and group 1 on the periodic table. It is solid at room temperature. (ii) It easily forms an oxide when exposed to air. (iii) When it reacts with water, hydrogen gas evolves. (iv) It must be stored submerged in oil.

Answer:

c

Explanation:

Answer:

A.All Mixtures Are Made Up Of Solutions

Explanation:

Answer: The average valence electron energy (AVEE) of this element =

1014.2 KJ/ mol  or  1.0142mJ/mol.

Explanation:

The average valence electron energy =  (number of electrons in s subshell  x  Ionization energy of that subshell) + (number of electrons in p subshell  x  Ionization energy of that subshell) / total number of electrons in both subshells of the valence shells.

The 5A elements are non-metals like Nitrogen and Phosphorus with the metallic character increasing as you go down the group, So a new 5A element will have characteristics of its group with 5 valence electron in its outermost shell represented as ns2 np3

Therefore  the average valence electron energy (AVEE) of this element will be calculated as

The average valence electron energy = (2 x 1370  kJ/mol + 3 x 777 kJ/mol.) / 5

2740+2331/ 5 =5071/5

=1014.2 KJ/ mol  or  1.0142mJ/mol.

Answer:

D

Explanation:

Energy can neither be destroyed or created but can change forms.

Hope this helps!

Answer: What conclusion can be drawn from the statement that an element has high ionization energy and small atomic size? The element is most likely from Group 1A or 2A and in period 1 or 2. Describe how the atomic radius of an element is related to metallic character.

Explanation: