What is the activation energy of this reaction?

50 kJ
100 kJ
150 kJ
200 kJ

Answer:

From top to bottom coyote, crow, squirrel, then acorn

Explanation:

The coyote has the least amount of energy and its the biggest predator so it belongs at the top. The crows eat squirrels and the squirrels eat acorns.

Answer:

You need concave lenses to lengthen the distance that light takes to focus in your eyes.

Answer:

option D

Explanation:

“You need concave lenses to lengthen the distance that light takes to focus in your eyes.”

2023

Answer: Gold Wire

Explanation:

Out of all of these options only gold wire is an element, elements are pure and cannot be broken down by any chemical means

hope it helped, good luck :)

Answer:

Its B :)

Hope this helps

Image B will shows the butter particles before and after thermal energy will be transferred to the solid butter by heating. So, the correct option is B.

The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.

The butter particles in Picture B are shown both before and after the solid butter has been heated to transmit thermal energy to it. This image shows a solid butter particle with tightly packed molecules, however when the butter is heated, it melts into a liquid form with loosely packed molecules.

Thus, the correct option is B.

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Answer:

Explanation:

Find the molar mass of H2SO4

2H = 2 * 1 = 2

S  = 1 * 32 =32

O4 = 4*16 = 64

total             98

Find the number of mols in 71.5 grams

mols = given mass / molar mass.

given mass = 71.5

molar mass = 98

mols = 71.5/98

mols = 0.7296 mols of H2SO4

Find the moles of H2O

From the Balanced equation, every mol of H2SO4 produces 2 moles of H2O

mols water = 2 * 0.7296

mols water = 1.4592

That's as far as I can take you. I have to know a great deal more to get the volume of H2O

Answer:

hmm that is a very tricky question. probably from over flooding with water

Answer:

What is the new volume if the temperature is constant? V=2.50L. P = lookPa. P2=40k Pa. V2 = x. PV = P2 ... If a sample of gas occupies 6.8 L at 327°C

Answer:

you need only one independent variable because if not, you wont know what factors have changed your experiment.

Explanation:

The equation of the reaction is [tex]2PbS + 3O_{2} --- > 2Pb + 2SO_{3}[/tex] and the mass of lead produced is 2.28 g

The term equation is the means by which we could be able to represent what is going on in the reaction system on a piece of paper. Thus, when we write a reaction equation, it is a representation of the process that is going on in the system. By the use of the stoichiometry of the reaction we could obtain the parameters of the equation.

The balanced reaction equation is; [tex]2PbS + 3O_{2} --- > 2Pb + 2SO_{3}[/tex].

Number of moles of lead (II) sulfide = 2.54 grams/239 g/mol = 0.011 moles

Number of moles of oxygen =  1.88 g/32 g/mol = 0.059 moles

If 2 moles of  lead (II) sulfide reacts with 3 moles of oxygen

0.011 moles of  lead (II) sulfide reacts with  0.011 moles  *  3 moles /2 moles

= 0.0017 moles

Hence  lead (II) sulfide is the limiting reactant.

If 2 moles of lead (II) sulfide produces 2 moles of lead

Mass of the Lead produced =   0.011 moles * 207 g/mol = 2.28 g

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Answer: a) 0.579 atm

b) 0.585 bar

c) 58662 Pa

Explanation:

Pressure of the gas is defined as the force exerted by the particles on the walls of the container. It is expressed in various terms like 'mmHg', 'atm', 'kiloPascals' etc..

All these units of pressure are inter convertible.

We are given:

Pressure of the gas = 440 mmHg

a) Converting this unit of pressure into 'atm' by using conversion factor:

[tex]760mmHg=1atm[/tex]

[tex]440mmHg=\frac{1}{760}\times 440=0.579atm[/tex]

b) Converting this unit of pressure into 'bars' by using conversion factor:

[tex]760mmHg=1.01bar[/tex]

[tex]440mmHg=\frac{1.01}{760}\times 440=0.585bar[/tex]

c) Converting this unit of pressure into 'Pascal' by using conversion factor:

[tex]760mmHg=101325Pa[/tex]

[tex]440mmHg=\frac{101325}{760}\times 440=58662Pa[/tex]

Answer:

Explanation: The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.

Answer:

50000 dollars or 5 e5

Explanation:

Mr. Garibay has [tex]5.0 * 10^4[/tex] dollars in his bank.

Scientific notation represents the data in the format of expanded number or with e character.

For instance, 5.0 * 10^4 dollars = 50000 dollars or 5 e5

Answer:

The pH and pOH of a 2.2*10⁻³ HBr solution is 2.66 and 11.34  respectively.

Explanation:

pH - short for hydrogen potential - is a measure of the acidity or alkalinity of a solution. So the pH is a parameter that indicates the concentration of hydrogen ions [H]⁺ that exist in a solution.

The pH is expressed as the negative base 10 logarithm of the hydrogen ion concentration. This is represented by:

pH= - log [H⁺]

pH is measured on a scale of 0 to 14. On this scale, a pH value of 7 is neutral, which means that the substance or solution is neither acidic nor alkaline. A pH value of less than 7 means that it is more acidic, and a pH value of more than 7 means that it is more alkaline.

HBr is a strong acid. Then, in aqueous solution it will be  totally dissociated. So the proton concentration is equal to the initial concentration of  acid:

[H⁺]= [HBr]= 2.2*10⁻³ M

So:

pH= - log (2.2*10⁻³)

pH= 2.66

On the other hand, pOH is a measure of the concentration of hydroxyl ions in a solution. The sum of pH and pOH equals 14:

pH + pOH= 14

2.66 + pOH= 14

pOH= 14 - 2.66

pOH= 11.34

The pH and pOH of a 2.2*10⁻³ HBr solution is 2.66 and 11.34  respectively.

Answer:

CuCl₂ is the excessive reactant and NaNO₃ the limiting reactant, 13.7g of NaCl can be formed.

Explanation:

Based on the reaction:

CuCl₂ + 2NaNO₃ → 2NaCl + Cu(NO₃)₂

To solve the problem we must convert the mass of each reactant in order to find limiting reactant as follows:

Moles CuCl₂ -Molar mass: 134.45g/mol-:

35g * (1mol / 134.45g) = 0.26 moles

Moles NaNO₃ -Molar mass: 84.99g/mol-:

20g * (1mol / 84.99g) = 0.235 moles

For a complete reaction of 0.235 moles of NaNO₃ there are required:

0.235 moles NaNO₃ * (1 mol CuCl₂ / 2 mol NaNO₃) = 0.118 moles CuCl₂

As there are 0.26 moles CuCl₂,

As 2 moles of NaNO₃ produce 2 moles of NaCl, he moles of NaCl produced are: 0.235 moles NaCl. The mass is:

Mass NaCl -Molar mass: 58.44g/mol-:

0.235 moles NaCl * (58.44g / mol) =

Answer:

the explanation of this 20

Explanation:

20 c

Answer:

D.  

cut.

Explanation:

Both the appearance and cooking times of food items are affected by the way a piece of food is cut. Thus option D is correct.

Food has an important role in both culture and cuisine of every country, Different types of food combine to form culinary delights which can bring people together

Food is obtained from both plants and animals where Plants are the primary producers in the food pyramid and all organism directly or indirectly obtain food from plants.

Herbivorous animals get their food from their  plant ecosystem where Some animals, obtain food by hunting other animals while others depend on decaying matter of plants and animals  which are called decomposers like bacteria, fungi.

Food offers  variety forms  depend upon climatic conditions and availability and depend on the different factors like Physical determinants ,Biological determinants, Economical determinants.

Thus option D is correct.

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I'm hoping the same for my new coaching classes

This is my first time going out to study ngl-

Answer:

24 hrs it takes for the earth to rotate

Answer:

Define Transportation in plants: Transportation in plants is when the plant transports water and other mineral throughout the whole plant from the roots to the stem and finally specific parts of a plant.

Define Respiration In Plants: Is when plants use photosynthesis to make their own food to make energy for the plant's growth

Answer:

Cinder cone

Explanation:

Answer:

In a titration, you determine an unknown concentration of a sample by adding a second reactant of known concentration. In many titrations, you use a chemical called an indicator, which lets you know when the titration finishes.

Explanation:

Answer:

2 CoBr3 + 3 CaSO4 = 3 CaBr2 + Co2(SO4)2

Explanation:

Answer: The percentage by mass of sulphur in [tex]Al_2(SO_4)_3[/tex] is 9.36%

Explanation:

Mass percent of an element is the ratio of mass of that element by the total mass expressed in terms of percentage.

[tex]{\text {Mass percentage}}=\frac{\text {mass of sulphur}}{\text {Total mass}}\times 100\%[/tex]

Given: mass of sulphur = 32 g/mol

mass of [tex]Al_2(SO_4)_3[/tex] = 342 g/mol

Putting in the values we get:

[tex]{\text {Mass percentage}}=\frac{32g/mol}{342g/mol}\times 100\%=9.36\%[/tex]

The percentage by mass of sulphur in [tex]Al_2(SO_4)_3[/tex] is 9.36%

Answer:

CNS (central nervous system)

Explanation:

The central nervous system is responsible for integrating sensory information and responding accordingly.

Neurons (specialized cells of the nervous system ) send signals along thin fibers called axons and communicate with other cells by releasing chemicals called neurotransmitters at cell-cell junctions called synapses.

Answer:

True

Explanation:

Answer:

Cell division is the process by which a cell, called the parent cell, divides into two cells, called daughter cells.[1] When the cell divides, everything inside it divides also. The nucleus and the chromosomes divide, and the mitochondria divide also.

In mitosis, an ordinary body (somatic) cell divides to make two daughter cells.

In meiosis, a cell divides twice, to produce four gametes (sex cells). The first division of meiosis is a special kind of cell division called a reduction division because the number of chromosomes is halved. The second division of meiosis is similar to mitosis.[2]

Three types of cell division: left is binary fission as in bacteria; right are mitosis and meiosis as in eukaryotes.

Cells are the 'building blocks' of life, and cell division is a basic feature of life. For simple unicellular organisms like Amoebozoa, one cell division reproduces the entire organism. On a larger scale, cell division can create offspring from multicellular organisms, such as plants that grow from cuttings. But most importantly, cell division enables organisms that are able to sexually reproduce to develop from the one-celled fertilised egg (zygote). Cell division also allows for continual renewal and repair of the organism.

The cell division is completed in the four phases prophase, metaphase, anaphase, and telophase.

It is the process by which cells divide into daughter cells. This keeps the cell organism to survive.

The five facts about cell division are:

Therefore, the cell division is completed in the four phases prophase, metaphase, anaphase, and telophase.

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Answer:

2.69g

Explanation:

The molar masses of

Cu = 63.5

Cl = 35.5

So the molar mass of [tex]CuCl_{2}[/tex] is 63.5 + (35.5 x 2) = 134.5

134.5 x 0.02 = 2.69g