Why is Polaris an important star?
Because it is the brightest star in the night sky
Because appears to remain in a fixed location due north while all the other stars appear to move around it a.
Because it is located halfway between The Big Dipper and Cassiopeia
Because you can find the North star from any place on Earth and never lose your way
Pleaseeee helpppp ;-;

Answer:

The sequence from longest wavelength (radio waves) to shortest wavelength (gamma rays) is also a sequence in energy from lowest energy to highest energy. Remember that waves transport energy from place to place. The energy carried by a radio wave is low, while the energy carried by a gamma ray is high.

Answer:

1. answer is subcutaneous tissue 2. answer is spleen

Explanation:

The subcutis is also known as the hypodermis or subcutaneous layer, and functions as both an insulator, conserving the body's heat, and as a shock-absorber, protecting the inner organs.

Excretory Organs. Organs of excretion include the skin, liver, large intestine, lungs, and kidneys. Together, these organs make up the excretory system.

Answer:

the answer is Subcutaneous Tissue

Explanation:

and the second one is Intestine

Answer:

23 g sodium

Explanation:

In chemistry, one mol (1mol) of a substance equals Avagadro's number or constant (6.02 × 10^23 atoms/particles/molecules).

According to this question in which the mass of different elements were given, the mass of the element that equals 6.02 × 10^23

Using the formula; mole = mass/molar mass

- Sodium = 23g/23g/mol = 1mol

- Krypton = 42g/84g/mol = 0.5mol

- Carbon = 24g/12g/mol = 2mol

- Pottasium = 78g/39g/mol = 2mol

Therefore, from the above illustration, it can be observed that only 23g of sodium contains 1 mol, hence, 23g sodium contains 6.02 × 10^23 atoms.

radiation is energy that comes from a source. (travels through the speed of light)

Answer:

0.19g NaCl

Explanation:

Multiply the volume by the  concentration to get the moles. Then, convert moles to grams which gives you that.

Balanced equation:

4 NH3 + 5 O2 = 4 NO + 6 H2O

Explanation:

[tex]2CH _{3}CH_{3}COOH + Na _{2}CO_{3} → 2CHCHCOONa + 2H ^{ + } + CO_{3} ^{ 2- } [/tex]

Answer: Formula: q = mcΔT,

- q is the amount of heat transferred

- m is the mass of the substance

-  c is the specific heat capacity of the substance

- ΔT is the change in temperature

q= 733 J

m=  312g

ΔT = 15 °C

Calculate this together  = 733 J / 312g  x 15 °C

= and then you can find your  answer for c.

Explanation:

Answer:

C

Explanation:

Answer:

make sure that the number of atoms on the left side of the equation equals the number of atoms on the right.

Explanation:

A chemical reaction can be balanced by multiplying each side with suitable integers such  that the number of each element in the reaction must be equal number on both side.

According to the law of conservation of mass for  a chemical reaction, the total mass in the reactant side is equal to the total mass in the product side. Thus, a balanced chemical equation represents the perfect stoichiometry for each reactants and products.

The number of each elements in both side have to be equal in number. If they are unequal on both side, we can balance the reaction by multiplying with suitable integers.

Lets have one example. Consider the given reaction.

[tex]\rm CH_{4} + O_{2} \rightarrow H_{2}O + CO_{2}[/tex]

Here, 4 H are in left side and only 2 in right side. Similarly number of oxygen also not balanced.

The balanced equation requires a coefficient of 2 for water and 2 for oxygen in reactant thus, it can be written as:

[tex]\rm CH_{4} + 2O_{2} \rightarrow 2H_{2}O + CO_{2}[/tex]

To find more on balanced reactions, refer here:

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Answer:

The process of photosynthesis occurs when green plants use the energy of light to convert carbon dioxide (CO2) and water (H2O) into carbohydrates. Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant, while air containing carbon dioxide and oxygen enters the plant through the leaf stomata.

Answer:

At 4°C what is not able to decompose into hydrogen and oxygen chemical changes cannot be reverted, in this case it can. It will not change color, because water is always clear, and won't at this state turn into ice. though it can be reverted.

Explanation:

I hope that is correct that's all I've learned so far!

Answer:

A) Its temperature

Explanation:

Answer:

25 mol.

Explanation:

The balanced chemical equation for the reaction depicted in this question is as follows:

4Fe + 3O2 → 2Fe2O3

Based on the above balanced equation, 4 moles of Fe produced 2 moles of Fe2O3.

Hence, 50 moles of Fe will produce as follows:

50 mol Fe × 2 mol Fe2O3/4 mol Fe

= 100/4

= 25 mol of Fe2O3

Answer:

Hydrogen

Lithium ,Beryllium,Nitrogen

Sodium.Magnesium,Phosphorus

Potassium,Calcium,Arsenic

Rubidium,Strontium,Antimony

The element in period 6 that would have chemical properties similar to nitrogen is bismuth.

The chemical properties of an element like oxidation states, reactivities, among others, are mainly related to its electronic configuration.

Elements located in the same group on the periodic table will have similar chemical properties since the electron configuration in their outer shell is the same.            

The electronic configuration of nitrogen is the following:

1s² 2s² 2p³  

Of all the elements of period 6, bismuth is the one that is located in the same nitrogen group (group 15), whose electronic configuration is:

[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³  

The electron configuration of group 15 (ns² np³) is which gives them chemical properties like high reactivity at high temperatures, high reactivity with oxidant acids (except for nitrogen), low or almost no reactivity with water, etc.    

Therefore, bismuth is the element in period 6 that would have chemical properties similar to nitrogen.

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I hope it helps you!            

Answer: The fourth material that is added to the blast furnace is HOT AIR which provides OXYGEN for used for combustion of carbon (Coke).

Explanation:

Iron is the second most abundant metal found in the earth's crust after aluminium. It is not found in the free metallic state but are extracted from rocks which are rich in iron that contains other materials. These are known are iron ores and the most common iron ores are haematite ( Fe2O3).

Iron can be extracted from its ore with the used of blast furnace. The materials used for extraction of iron includes:

--> Coke

--> haematite( iron ore)

--> limestone and

--> Hot air.

The iron ore is first roasted in air so that iron(III)oxide is produced. The iron(III)oxide is then mixed with coke and limestone and heated to a very high temperature. Hot air is introduced into it from the bottom of the furnace. The coke is oxidizes the the oxygen in the hot air blast to liberate carbondioxide.

Answer:

D. inorganic substances​

Explanation:

Inorganic lacks carbon, which is usually found in living things.

Assuming the reaction is complete, there should be no limiting reactant remaining after a reaction. This is because the limiting reactant, by definition, is "the reactant that is completely used up in a reaction."

Answer:

A

Explanation:

I looked it up and this was the answer for your question

Answer:

utcluclult

Explanation:

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Answer:

no WAYYYYYYY ITS SO EASY!!111!11

Explanation:

1: Biosphere

2: Atmosphere

3: Hydrosphere

4: Atmosphere (I think?)

5: Stratosphere

6: Biosphere

7: Hydrosphere

8: Geosphere

:)

Answer:

True.

Explanation:

Answer:

Its Neon

Explanation:

Why ? Because Neon is the fastest it can go to 435 m/s and thats one of the fastest element there.

Helium would have the fastest rate of diffusion. Therefore, option (C) is correct.

Graham’s law states that the rate of diffusion of a gas is inversely proportional to the square root of the molecular weight of that gas.

According to Graham’s Law, molecules of gas with lower molecular mass at constant pressure and temperature will diffuse faster than the higher molecular mass molecules. This formula is commonly utilized to compare the rates of diffusion of two different gases at the same pressures and temperatures.

[tex]\frac{Rate_1}{Rate_2} =\sqrt{\frac{M_2}{M_1} }[/tex]

Where M₁ is the molar mass of gas 1 while M₂ is the molar mass of gas 2.

The atomic mass of He, Ne, Ar, and Ke is 4, 20, 40, and 83 g/mol. The helium gas has the lowest atomic mass so it has the highest rate of diffusion while Krypton has the lowest rate of diffusion.

Learn more about Graham's law, here:

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