Which extinction factors do you think cause the most extinctions? Why?

Answer:

Reaction #4

Explanation:

Generally, combustion reactions produce water and carbon dioxide, and the fourth answer choice is the only one that produces both of these compounds. Therefore, the fourth answer choice is the only one that can be a combustion reaction.

Answer: [tex]K_p=\frac{[H_2]^4}{[CH_4]^1[H_2O]^2}[/tex]

As value of K is greater than 1, the reaction is forward driven.

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. For equilibrium constant in terms of pressure , only gaseous reactants and products are considered.

For the given chemical reaction:

[tex]CaO(s)+CH_4(g)+2H_2O(g)\rightleftharpoons CaCO_3(s)+4H_2(g)[/tex]

The expression for [tex]K_p[/tex] is written as:

[tex]K_p=\frac{[H_2]^4}{[CH_4]^1[H_2O]^2}[/tex]  

As > 1, the reaction will be favoured in the forward direction and thus more products will be there.

The answer is B. the molar mass.

The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles.

According to Newton's first law of motion,if a large rock hits the bike your body will fly forward as an external force is acting on it.

Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.

Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.

Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic  mechanics is based on modern kinematics.

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Answer:

Mass = 11.23 g

Explanation:

Given data:

Mass of water produced = ?

Mass of ammonium nitrate decomposed = 25.0 g

Solution:

Chemical equation:

NH₄NO₃     →    N₂O + 2H₂O

Number of moles of NH₄NO₃ :

Number of moles = mass/molar mass

Number of moles = 25.0 g/ 80.0 g/mol

Number of moles = 0.312 mol

Now we will compare the moles of NH₄NO₃  and H₂O

            NH₄NO₃       :        H₂O

                1               :          2

             0.312          :       2/1×0.312 = 0.624 mol

Mass of water formed:

Mass = number of moles × molar mass

Mass = 0.624 mol × 18 g/mol

Mass = 11.23 g

11.23 grams of water produced from the decomposition of 25.00 grams of solid Ammonium Nitrate.

How we calculate moles from mass?

We can determine the moles of any substance by using the equation:

n = W /M, Where:

n = no. of moles

W = given mass

And M = molar mass

Given balanced equation is:

NH₄NO₃ → N₂O + 2H₂O

Also given that mass of NH₄NO₃ = 25 g

Mole of NH₄NO₃ = 25 / 80 = 0.312 mol

From the stoichiometry of the reaction, ratio between NH₄NO₃ and water is 1:2; it means one mole of NH₄NO₃ will produce 2 moles of water.

Moles of water formed = 2 × 0.312 = 0.624 mol

Now we convert this mole to grams through following way:

W = n × M

W = 0.624 × 18 = 11.23 grams

Hence, produced mass of water is 11.23 grams.

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Answer:

Molecular formula = C₂H₆

Explanation:

Given data:

Percentage of hydrogen = 20.0 %

Percentage of carbon = 80.0 %

Molar mass = 30.0 g  

Empirical formula = ?

Solution:

Number of gram atoms of H = 20 / 1.01 = 19.8  

Number of gram atoms of C = 80 /12 = 6.7

Atomic ratio:

            C              :           H            

         6.7/6.7        :        19.8/6.7  

            1               :           3        

C : H = 1 : 3

Empirical formula is CH₃.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula = CH₃ = 12×1 +3×1.01 = 15.03 g/mol

n = 30 g/mol / 15.03 g/mol

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (CH₃)

Molecular formula = C₂H₆

Answer:

B

Explanation:

The cell membrane is semipermeable that allows the movement of material in and out of the cell. The correct option is B.

The cell membrane, also renowned as the plasma membrane, is detected in all cells as well as serves to differentiate the cell's interior from the outside environment.

The cell's membrane is comprised of a semipermeable lipid bilayer. The cell membrane controls the transport of materials into and out of the cell.

Proteins as well as lipids help compensate cell membranes. Because they are mostly made of lipids, only certain substances can pass through.

Phospholipids are the most common lipid found in membranes. Phospholipids are composed of two layers: outer and inner.

It also provides a consistent environment within the cell. And that membrane serves several purposes. One function is to transport nutrients into the cell, while the other is to transport toxic substances out of the cell.

Thus, the correct option is B.

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Answer:

mountains

Explanation:

mountains is the answer because mountains are just there doing nothing

The characteristics of the atomic models that the energy levels are discrete allow to explain the existence of bright lines in the emission spectra is:  

The energy levels of the atoms were initially explained by Bohr's model and later fully resolved and explained by quantum mechanics, in all these models they are discrete levels and there is nothing between them.

When the atoms are in their base state, all the electrons occupy the different levels allowed, before some excitation one of the electrons jumps from one level to another higher, after a period of time this electron falls back to the lower levels directly or by jumps if there are empty intermediate allowed levels, in each fall jump a little energy is released, this is the bright lines in the atomic spectra

The energy of the bright lines matches the difference in energy between the two levels involved.

In conclusion, the characteristics of the atomic models that the energy levels are discrete allow you to explain the existence of bright lines in the emission spectra.  

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Answer:

They may react in the air and become an acidic gases.

Answer:

Genetic Variation

Explanation:

Gene flow — also called migration — is any movement of individuals, and/or the genetic material they carry, from one population to another. ... If gene versions are carried to a population where those gene versions previously did not exist, gene flow can be a very important source of genetic variation.

The places where the edges of the earth plates meet is called ;

The earth plates are made up of the earth's crust and the upper part of the Earth's mantle which are generally referred to as the Earth's lithosphere.

The Tectonic plates can be convergent, divergent or simply slide pass each other. The fault line is a crack on the earth crust due to movement of the plates, therefore at this point the edges of the earth plates meets each other due to the relative movement of the plates.

Hence we can conclude that the places where the edges of the earth plates meet are called fault lines of the earth.

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Answer:

Net: 1N

Explanation:

1.) Net:1N, direction: left

2.) Net: 1N, direction: down

3.) Net: 0N, no motion

4.) Net: 1N, direction: up

5.) Net: 1N, direction: up

%yield = 91.8

Given

20 g NaCl

45 g AgCl

Required

%yield

Solution

Reaction

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

mol NaCl :

= mass : MW

= 20 g : 58,44 g/mol

= 0.342

mol AgCl from equation :

= 1/1 x mol NaCl

= 1/1 x 0.342

= 0.342

Mass AgCl(theoretical) :

= mol x MW

= 0.342  x 143,32 g/mol

= 49.02 g

%yield = (actual/theoretical) x 100%

%yield = (45/49.02) x 100%

%yield = 91.8

Percentage % yield = 91.8%

Given:

20 g NaCl

45 g AgCl

To find:

% yield=?

The balanced chemical equation will be:

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

First, we need to calculate moles of NaCl.

[tex]\text{Number of Moles}=\frac{\text{Given Mass}}{\text{Molar Mass}} \\\\\text{Number of Moles}=\frac{20}{58.44} \\\\\text{Number of Moles}= 0.342 moles[/tex]

Then, calculate moles of AgCl from equation:

[tex]\text{mol of AgCl}= 1/1 * \text{ mol NaCl}\\\\\text{mol of AgCl}= 1/1 * 0.342\\\\\text{mol of AgCl}= 0.342[/tex]

Mass AgCl(theoretical) :

[tex]\text{Mass of AgCl}= mol * MW\\\\\text{Mass of AgCl}= 0.342 x 143,32 g/mol\\\\\text{Mass of AgCl}= 49.02 g[/tex]

Now, calculate for percentage yield.

[tex]\%yield =\frac{actual}{theoretical} * 100\%\\\\\%yield = (45/49.02) * 100\%\\\\\%yield = 91.8\%[/tex]

The percentage yield will be 91.8%.

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Answer:

8.33 meters per second

Explanation:

1500 meters/180 seconds=1500/180=8.3333 meters per second

Answer:

The correct answer is - false.

Explanation:

At the energy-generating station, when the coal is burned, the chemical energy store in the coal converted into thermal energy and light or luminous energy.

The thermic energy generated used to heat and boil the water or liquid to generate the gas and generate the kinetic energy to move the fan that is desgined to generate the electrical energy.

Thus, the statment is false statement as it does not convert into sound energy.

Answer:

B) the chemicals are gaining energy from the surroundings.

Explanation:

The positive sign of the energy difference in a chemical reaction would indicate that the chemicals are gaining energy from the surroundings. This is what happens in an endothermic reaction.

In an endothermic reaction, heat is absorbed from the surroundings hence the surrounding becomes colder at the end of the changes.

O₂ as a limiting reactant

Given

28 moles of butene

228 moles of Oxygen

Required

Limiting reactant

Solution

We use the basis for the given reaction because for the name butane it should have the formula C₄H₁₀, while C₄H₈ is butene

Reaction(balanced)

C₄H₈ + 6 O₂ → 4 CO₂ + 4 H₂O

Find limitng reactant from mol : coefficient of reactants

C₄H₈ : 28 : 1 = 28

O₂ : 228 : 6 = 38

O₂ as a limiting reactant (smaller ratio)

Answer:

9.7 ml

Explanation:

Molarity = 2.5 M

Mass = 0.97g

Volume = ?

The relationship between these quantities is;

Molarity = Number of moles / Volume

Number of moles = Mass / Molar mass

Molar mass of NaOH = 40g/mol

Number of moles = 0.97 / 40  = 0.02425 mol

Volume = Number of moles / Molarity = 0.02425 / 2.5 = 0.0097 L

1000 ml = 1L

x = 0.0097 L

x = 0.0097 * 1000 = 9.7 ml

Answer:

False

Explanation:

Heat is the total kinetic energy possessed by molecules the body while temperature is the average kinetic energy possessed by the molecules of the body. Hence, the temperature and heat energy are different.

Answer:

active transport

Explanation:

passive transport does not involve energy

Answer:

search it up ;)

Explanation:

Answer:

D.NaOH

Explanation:

The compound that contains both ionic and covalent bonds from the given choices is NaOH, sodium hydroxide.

An ionic bond is formed between a metal and non-metal. In this compound, the metal is the Na and non - metal is the OH. To form this bond type, an atom transfers its electrons to the non-metal to attain stability.

The radical group OH⁻ which acts as a single unit is made up of a covalent bond. It involves the sharing of electrons between two non-metals whose electronegativity difference is very similar to one another.

Answer:

Ionic substance

Explanation:

An ionic substance is formed when oppositely charged ions link up to form an infinitely large lattice structure that can only be described in terms of unit cells.

Ionic substances may consist of billions of oppositely charged ions. Ionic substances are hard, have high melting and boiling points and do not conduct electricity in the solid state because the ions are not free in the solid state.

However, in solution or molten state, the substance conducts electricity since the ions which are the charge carriers are now mobile.

Answer:

gg

Explanation:

Answer:

Approx 32g

Explanation:

Oxygen has an atomic weight of 15.999. Times to is 32g

Answer:

I hope it helps..... you can stop at the full-stop