PLEASE HELP!!!!!!! SCIENCEE!!!!
THE CHOICES ARE: 1, 2, 3 FOR THE FIRST ONE.
THE SECOND ONE: from a common ancestor, completely independently of each other

Answer:

sunlight

Explanation:

it is the sunlight

Explanation:

High density medium to low density medium.

Answer:

here.

Explanation:

molar absorptivity, path length of cuvette, test tube, and concentration.

Answer:

39.98 liters

Explanation:

hope this helps

Answer:

Solids

Explanation:

Electromagnetic waves travel fastest in empty space. But they are slowest in solids

An antacid is a substance which neutralizes stomach acidity and is used to relieve heartburn, indigestion or an upset stomach. Some antacids have been used in the treatment of constipation and diarrhea. Marketed antacids contain salts of aluminum, calcium, magnesium, or sodium.

Antacids help to treat heartburn (indigestion). They work by neutralizing the stomach acid that causes heartburn. You can buy many antacids without a prescription. Liquid forms work faster, but you may like tablets because they are easy to use.

solids Highest density definite shape and colour

liquids Indefinite shape and defining volumes particles glide past each other

Gases Indefinite shape Indefinite volume lowest density

Explanation:

this is due to the nature of its molecules

The values of n in CH₃(CH₂)ₙCH₃ if the name of the hydrocarbon is heptane is equal to 5.

Hydrocarbonds are the compounds which are formed by the composition of hydrogen and carbon atoms.

In the question wanted hydrocarbon is heptane, in which 'hept' means 7 and 'ane' means alkane. Given formula of hydrocarbon is CH₃(CH₂)ₙCH₃ in which already 2 carbons of CH₃ group is present and to complete 7 carbons, the number of n should be 5.

So the required value of n is 5.

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Answer:

Elements are arranged from left to right and top to bottom in order of  increasing atomic number. As, The modern periodic law tells that the Elements in the modern periodic table are arranged by increasing atomic numbers.

Answer:

See below ~

Explanation:

Properties used to arrange elements

Taking into account the definition of molarity, the molarity of the solution is 0.186[tex]\frac{moles}{liter}[/tex].

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]Molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, you know:

Replacing in the definition of molarity:

[tex]Molarity=\frac{3x10^{-3} moles}{0.0161 L}[/tex]

Solving:

molarity= 0.186[tex]\frac{moles}{liter}[/tex]

Finally, the molarity of the solution is 0.186[tex]\frac{moles}{liter}[/tex].

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Least no of moles means it should be 1mol

Hence

Taking into account the definition of molarity, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]Molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, you know:

Replacing in the definition of molarity:

[tex]Molarity=\frac{12.099 moles}{1.5 L}[/tex]

Solving:

molarity= 8.066[tex]\frac{moles}{liter}[/tex]

Finally, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].

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Answer:

                                                    United States

Molecules themselves can move in any direction, they can rotate, and they can vibrate as the atoms within a molecule move back and forth relative to each-other, as if the chemical bonds connecting them were springs. Answer 5: They bounce around and wiggle and jiggle around.

                                                Soviet Union

In terms of actually transporting this east, any and every means was used. Rail was obviously key - the evacuation alone used some 1.5 million rail cars in 1941 - but trucks were also used. Korolev planned to move forward with the Soyuz craft and N-1 heavy booster that would be the basis of a permanent crewed space station and crewed exploration

I’m so sorry if it’s wrong I tried my best

The main two requirements to compare the energy for 2 compounds are the balanced chemical formula and the temperature of the compounds.

Gibb's free energy change of any reaction will be calculated by using the below equation as:

ΔG = ΔH - TΔS, where

ΔH = change in enthalpy

T = temperature

ΔS = change in entropy

Before calculating the free energy of any reaction you should first balance the given chemical reaction to check the involved moles of substance and also the value of temperature before & after the completion of reaction to check the nature of the reaction.

Hence balancing the equation and checking the temperature are the two requirements.

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Answer:

Either A. or C. Evaluating, but most likely C.

Explanation:

The reason it is C is because to find out wheather something is true or not, you are not claiming otherwise nor complicating, you are finding, but evaluating sounds better.

Answer:

A D F

Explanation:

Its right but its not in order But its A D and F

Answer:

answer in picture

Explanation:

Answer:Argon is unreactive because it has the maximum number of electrons in its outer shell. Noble gases are unreactive because they have the full complement of electrons in their outermost energy levels.

Explanation:

Answer:

Argon is element 18 on the periodic table, which means that it has 18 proton in it's nucleus. Argon is in group 8 or 18 depending on your periodic table. Argon is a gas at standard temperature and pressure with a density of 1.784g/l

Answer:

vVv

Explanation:

innate means "inborn or natural", meaning they were born with it. if somewhat is born with an inate immunity, it means it was passed through genetics aka heredity

12 moles of water are produced when 4.0 moles of propane are mixed with 15.0 moles of oxygen,

A combustion reaction is one in which a substance reacts with oxygen releasing heat and light energy.

People burns in oxygen to produce carbon (iv) oxide and water according to the equation below:

[tex]C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O[/tex]

1 mole of propane reacts with 5 moles of oxygen to produce 4 moles of water.

15 moles of oxygen will react with 3 moles of propane to produce 12 moles of water.

Therefore, If 4.0 moles of propane are mixed with 15.0 moles of oxygen, 12 moles of water are produced

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Answer:

b) a rubber tire

Explanation:

Answer: B - a rubber tire

Explanation: Rubber is an insulator

The rate and quantity of carbon flow today has increased exponentially compared to 300 years ago.

Carbon flow refers to the process by which carbon flows through the earth.

Carbon flow can also be referred to as the carbon cycle.

Due to industrialization and the burning of fossil fuels, the rate of carbon flow has increased exponentially.

Therefore, compared to 300 years ago, the rate and quantity of carbon flow has increased.

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Volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.

Volatile substances are substances which can easily vaporize or change to gaseous state.

Volatile substances can either be solids or liquids but are mostly liquids.

Example of volatile substances include ether, petrol, chocolate.

The presence of volatile substances can be detected by the gases they release which may have characteristic odors.

Therefore, volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.

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The new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

At standard remperature and pressure

To calculate the new volume of the helium gas, we subtsitute our given values into the expression above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

V₂ = P₁V₁T₂ / P₂T₁

V₂ = ( 1.0atm × 0.32L × 425.0K ) / ( 3.50atm × 273.15K )

V₂ = 136LatmK / 956.025atmK

V₂ = 0.14L

V₂ = 1.40×10²mL

Therefore, the new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.

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Answer:

the answer to number 9 is A.

Explanation:

Explanation:

the difference in electronegativity between metals and non-metals is so great that the non-metals simply take the electrons from the metals forming ions of opposite charge.

Answer:

C

Explanation:

Isotopes are atoms of the same elements having same atomic number but different mass number