Why is it important to classify living organisms? The DNA of organisms may be more easily analyzed. Organisms may survive longer if they are classified. Scientists may study and discuss organisms more easily. Classifying is needed before scientists may make observations.

Answer:

hydrogen and oxygen.

Explanation:

Answer:

light is the result of electrons moving between defined energy levels in an atom called shells.

Explanation:

when something exited an atom like collision with another atom or a chemical reaction, an electron may absorb energy boosting it to a higher level shell.

Answer:

159g

Explanation:

Copper (I) sulfide is formed by the chemical reaction between copper and sulfur. Copper is a limiting reagent that results in the formation of 190.26 grams of copper(I) sulfide.

A limiting reagent is defined as the reactant that gets completely utilized in the reaction and affects the amount of the product formation. On the contrary, the excess reagent is present in more amounts.

Given,

Mass of copper = 127 gm

Mass of sulfur = 41 gm

Moles of copper:

n = mass ÷ molar mass

n = 127 ÷ 63.546

n = 1.99

Moles of sulfur:

n = 41 ÷ 32.065

n = 1.27

The reaction is shown as:

Cu + S → CuS

Here, 9 g of sulfur remains unreacted and hence is an excess reagent, and copper being consumed is a limiting reagent.

Here, 1 mole of copper reacts to form 1 mole of copper sulfide hence, 1.99 moles of Cu produces, 1.99 moles of copper sulfide.

Mass of CuS is calculated as:

Mass = moles × molar mass

Mass = 1.99 mol × 95.611 g/mol

= 190.26 grams

Therefore, 127 gm of copper and 41 gm of sulfur produces 190.26 grams of copper sulfide.

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Answer:

53.4%

Explanation:

N₂ + 3H₂ → 2NH₃

Given that:

26.3 g of H₂ react with N₂ to produce 79.0 g of NH₃

Then:

The number of moles of H₂ = 26.3g of H₂ * (1 mol of H₂/ 2.02g of H₂)

= 13.05 mol of H₂

The number of moles of NH₃ = 13.05 mol of H₂ * ( 2mol of NH₃/ 3 mol of H₂)

= 8.697 mol of NH₃

The mass of NH₃ = 8.697 mol of NH₃ *( 17.04g of NH₃/ 1 mol of NH₃) = 148.1 g of NH₃

The percent yield = actual yield/ theoretical yield * 100%

The percent yield = ( 79.0 g/ 148.1 g )* 100%

The percent yield ≅ 53.4 %

Answer:

53.4

Explanation:

Explanation:

All the elements in one group have the same number of valence electrons. The valence electrons are those on the energy level the most distant from the nucleus. These valence electrons are those involved in bonding with other atoms to form compounds.

In the periodic table elements in the same group posses similar physical and chemical property and this is due to the similarity in the number of valence electrons found in their  valence shells.

While in the periodic table as we move down a group the atomic number of the elements will continue to increase because elements in the same group are located in different periods as well.

Hence we can conclude that the difference in the elements located in a group is that they have different atomic numbers while the similarities is that the posses the same number of valence electrons.

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Answer:

1) Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

2) By collecting the hydrogen gas that is produced over water or in a syringe, rate graphs can be produced. The volume of gas produced and the time taken need to be recorded. The rate of the same reaction could be monitored by measuring the change in the mass of reactants as they react to form products.

Answer: sorry i’m late but the answer is D- wavelength :)

Explanation:

Answer: It tells you if your hyposthesis was incorrect or correct from the data. The data supports this because you tested and got your results correctly which will help you to form a hypothesis.

Explanation:

Answer:

It tells you if your hyposthesis was incorrect or correct from the data. The data supports this because you tested and got your results correctly which will help you to form a hypothesis.

Explanation: its right trust me

Answer:

Well what I found was that this was this answer  

Explanation:

A mole is 6.022 x 1023 objects of any kind - atoms, electrons, molecules, cars, people, etc... . It is known as Avogadro's number after the scientist who discovered ... Blah blah I think you get it.  

Answer:

A

Explanation:

2.60 g of CoCl2 was dissolved in water to make 100 mL of solution.

Number of moles of CoCl2 dissolved = mass/molar mass

                                = 2.60/130

                                   = 0.02 mole

Molar concentration of solutions = number of moles/volume (dm3)

                          = 0.02/0.1

                            = 0.200 M

Hence, the molar concentration of thesolution is 0.200 molar.

Correct option = A

A student prepared a solution used to make the solutions for the standard curve by dissolving 2.60g of CoCl₂ (molar mass 130. g/mol) in enough water to make 100. mL of solution. The molar concentration of the solution is 2.00 M.

First, we will convert 2.60 g to moles of CoCl₂ using its molar mass (130. g/mol) as the conversion factor.

[tex]2.60 g \times \frac{1mol}{130. g} = 0.0200 mol[/tex]

0.0200 moles of CoCl₂ are in 100. mL (0.100 L) of solution. The molar concentration of the solution is:

[tex]M = \frac{0.200 mol}{0.100 L} = 2.00 M[/tex]

A student prepared a solution used to make the solutions for the standard curve by dissolving 2.60g of CoCl₂ (molar mass 130. g/mol) in enough water to make 100. mL of solution. The molar concentration of the solution is 2.00 M.

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Answer:

Shorter waves vibrate at higher frequencies and have higher energies. Red light has a frequency of around 430 terahertz, while blue's frequency is closer to 750 terahertz. Red photons of light carry about 1.8 electron volts (eV) of energy, while each blue photon transmits about 3.1 eV.

Im so sorry if this isnt what you are looking for :(

Happy if it is :3

Answer: proton

Explanation:

They are what give an atom it’s identity

Answer:

The presence of 1-2% ethanol as catalyst, suppresses the oxidation of chloroform with oxygen to give a poisonous gas called phosgene. ... Here glycerol acts as negative catalyst. Criteria or characteristics of catalysts. i. The mass and chemical composition of catalyst should remain unchanged at the end of the reaction.

Explanation:

Answer:

i dont really have explaining but see green leaf have some amount of water and chlorophyll so it doesn't get burnt and dry leaves lose water and have no amount of them so they get burnt

Answer: The mass of the nucleus is less than the mass of the 8 protons and 8 neutrons.

Explanation:

Answer:

7

Explanation:

the number that represents a neutral pH is 7

Answer:

7

Explanation:

The neutral p H like Water is 7.

Answer:

Calcium

Explanation:

It has the largest atom

Answer:

explanation and image attached

Explanation:

Our aim is to draw a structure of XeO2F2 whith the least formal charges. We must remember that the compound has 34 valence electrons.

To obtain the least formal charges then Xe must have a total of twelve electrons on its valence shell instead of eight.

The other atoms around the central Xe atom are arranged as shown in the image attached.

Image Credit: UCLA

The correct Lewis structure allows all the atoms involved in the bond to have eight electrons in the valence layer.

You can see this structure in the image attached below.

We can arrive at this answer because:

In this case, we can observe the figure below and count the number of electrons that each atom reaches with the covalent bond between them. This will show us that each has eight electrons, which is the correct structure for [tex]X_eO_2F_2[/tex].

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Answer:

Sublimation is a critical component for the water cycle in cold climates where water in the solid form or ice is prevalent because sublimation which is the transformation of a solid substance to a liquid without passing through the liquid phase including when ice transforms directly into vapors, readily takes place when the relative humidity is low and the wind is dry, which are conditions that can be found combined mainly in cold climates

Explanation:

Answer: Ionic

Explanation:

how did u even find me again i wanna see if people are

me with a wey some one made

Answer:ok

Explanation:

Answer:

Please mark as Brainliest!!

Explanation:

The former, known as a 'Lewis dot diagram,' indicates a pair of shared electrons between the atomic symbols, while the latter, known as a 'Lewis structure,' uses a dash to indicate the pair of shared electrons that form a covalent bond. More complicated molecules are depicted this way as well.

Answer:

Exothermic, it obeys the law of conservation of energy

Explanation:

The reaction is an exothermic change. In this kind of change, heat is liberated to the surrounding. So the surrounding becomes hotter at the end of the heat change.

In chemical reactions that involves the loss of energy as heat, they obey the law of conservation of energy.

The law of conservation of energy states that energy is neither created nor destroyed but transformed from one form to another. In such reactions as this, chemical energy is transformed into heat energy.

Answer:

f = 0.6× 10¹⁶ Hz

Explanation:

Given data:

Wavelength of radiation = 5.00 × 10⁻⁸ m

Frequency of radiation = ?

Solution:

Formula:

Speed of light = wavelength × frequency

speed of light = 3 × 10⁸m/s

Now we will put he values in formula.

3 × 10⁸m/s = 5.00 × 10⁻⁸ m ×  f

f = 3 × 10⁸m/s / 5.00 × 10⁻⁸ m

f = 0.6× 10¹⁶ s⁻¹

s⁻¹ = Hz

f = 0.6× 10¹⁶ Hz

Answer:

energy from a source that is not depleted when used, such as wind or solar power.

Explanation:

Explanation:

renewable energy is energy from a source that is not depleted when used such as wind or solar power.

Hope this helps :)