Chemistry High School

What is a single layer of graphite called
Asking for GCSE Chemistry

Answers

Answer 1

Answer:

GRAPHENE is a single layer of graphite

Explanation:

each carbon atom bonded to 3 other carbon atoms forming a hexagonal lattice

Related Questions


How many molecules are there in 3.1 mol CO2

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Answer:

Abs : 1.8662 × 10^24

Explanation:

1 mol of CO2 contains 6.02 × 10^24 molecules

So, 3.1 mol of CO2 contains 6.02 × 10^24 × 3.1 mol = 1.8662 × 10^24

What is the energy of a photon emitted when an electron in a hydrogen atom relaxes from an orbital in ni

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Answer:  Ernest Z. The energy is 1.549×10-19J

Explanation:

Why does in the golf stream warm and provide it’s Rhode Island or Bangor Maine

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An ice cube in a pint glass demonstrates how the shrinking polar ice cap gives more flow to a stronger Gulf Stream, while an ice cube in the adjacent pint glass demonstrates why Gulf of Maine seawater is not warming faster than any other water body.


Please help I’ll give brainlist who ever answers I just want the answer so please help!!

Answers

Answer:

{B}

Explanation:

The answer is b. Some of the components are very large,

Are crystals of different soluble solids similar?​

Answers

Crystals of different soluble solids  are not similar because they are  amorphous and   therefore  do not have definite crystals.

What are crystal solids?

A crystalline solid is a homogeneous solid in which the constituent particles, atoms, ions or molecules are arranged in a definite repeating pattern.

Most of the solid substances are crystalline in nature. The arrangement of particles in a crystalline solid is such that the total intermolecular force of attraction is at maximum.

Factors in which solubility depends are temperature, pH, and ionic strength.

Crystals of different soluble solids are not similar as they do not have definite crystals.

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What happens when potassium forms an ion?

Answers

Answer:

It loses an electron and has an octet in the next-lowest energy level

Explanation:

what is the answer to this:magnesium+oxygen

Answers

A student balanced the chemical equation Mg + O2 →MgO by writing Mg + O2 → MgO2.

Answer:

magnesium oxide

Explanation:

When carbon dioxide enters the blood, some of it combines with ____________ to form carbaminohemoglobin, but most of it becomes ____________ ions that diffuse into the blood plasma.

Answers

Answer:

hemoglobin to become bicarbonate

Explanation:

When carbon dioxide enters the blood it combines with hemoglobin to form carbamino hemoglobin or carboxyhemoglobin but most of it becomes carbonate ions and diffuse into the blood plasma.

What is carboxyhemoglobin?

Hemoglobin is a blood protein giving red colour to the blood. It helps to transport oxygen everywhere. When oxygen fills in the air sack, it combines with oxygen and form oxyhemoglobin.

However, hemoglobin have more affinity towards carbon dioxide and and they combines to form carbaminohemoglobin which prevents the transportation of oxygen through blood.

The carbon dioxide will be converted into carbonic acid by combining with water. This acid then forms its carbonate ions and these ions helps to maintain the blood pH to be constant.The carbonate ions, CO₃²⁻can easily diffuse into blood plasma.

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chemistry A Gases unit test

Answers

Answer:

gas is composed to particles and has a mass.


11) When sodium metal is subjected to violet light, it causes the photoelectric effect. However, red light does not affect
the sodium. Explain this phenomena.

Answers

The maximum wavelength for which photoelectric effect occurs in sodium is 400 nm.

Photoelectric effect has to do with the ejection of electrons from a clean metal surface when energy is supplied in the form of light. All wavelengths of light are not capable of achieving photoelectric effect.

There exists a maximum wavelength that the incident rays must posses in order for photoelectric effect to occur. The maximum wavelength for which photoelectric effect occurs in sodium is 400 nm.

The wavelength of red light is around 625 - 740 nm which is far longer than the wavelength of violet light which is around 380 - 425 nm. Hence, when sodium metal is subjected to violet light, it causes the photoelectric effect but red light does not affect the sodium metal.

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if 15 grams of carbon is present at the beginning of a reaction,how many grams of carbon will be present in the products?

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The law of conservation states that the mass of the element remains the same during the course of the reaction.

The law of reaction conformed by the following:-

Mass of reactantMass of product

According to the question, the amount of carbon is 15g in the reactant and the amount will remain same at the end of reaction, which is product that is 15g.

Hence, the amount remain same in the reaction that is 15g.

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what happens when ice changes to water the link up of the atoms

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Answer:

Removing heat causes water (a liquid) to freeze to form ice (a solid). When water changes to a solid or a gas, we say it changes to a different state of matter. ... This causes the hydrogen atoms in one water molecule to be attracted to the oxygen atom in another water molecule.

Explanation:

a car accelerates from rest(zero speed) up to a spees of m/s to a speed of 30 m/s in 12 seconds. calculate the acceleration.​

Answers

acceleration = 2.5m/s^3

examples of physical properties.

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Answer: Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. We can observe some physical properties, such as density and color, without changing the physical state of the matter observed.

Explanation:

3. What type of gas do plants take in?
oxygen
carbon dioxide

Answers

Answer:

Archaeology is the study of the human past using material remains. These remains can be any objects that people created, modified, or used.

Explanation:

Carbon dioxide, plants absorb it though the process of photosynthesis, where they absorb carbon dioxide,water, and sunlight to synthesize energy for themselves as glucose, and they then produce and release oxygen as a result of this process

what are colloids ? ​

Answers

A solution in which the size of solute particles is intermediate between those in true solution and suspension is called as Colloids.

Answer: A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance.

Hope it helps , have a nice day :>

An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atomic mass, and net charge?

Answers

Answer:

Atomic number: 26

Atomic mass: 56

Net charge: +3

Explanation:

as liquid or gases heat up, they ___________. Then as they___________ they fall, thus As liquid or gases heat up, they driving the motion the of convection.


A: Fall, Heat
B: Bubble, Overflow
C: Create Heat, Burn
D: Rise, Cool



Help please its okay if not <3 ​

Answers

Answer:

so sorry but I need to randomly answer 2 questions


An atom, X, contains 16 protons.
Which statement about Z is correct?Explain why.
A) It cannot form an ion.
B) It contains 6 electrons in the outer shell.
C) It contains 6 neutrons.
D) It had relative atomic mass of 16.

Answers

Answer:

B

Explanation:   as protons no. = electrons no.= atomic number(Z)

3. Elements in the s and p blocks of the periodic table are called
a. alloys.
b. main-group elements.
C. metals.
d. transition metals.

Answers

Answer:

The answer is B: main-group elements.

Explanation:

Answer:

b

Explanation:

are diamonds and graphite made from the same element

Answers

Answer:

Graphite and diamond are two of the most interesting minerals. They are identical chemically – both are composed of carbon (C), but physically, they are very different. Minerals that have the same chemistry but different crystal structures are called polymorphs.

Please help me with the question below

Answers

the answer is b
pls give brainly i need points

Solve the following problems to determine the empirical formula. Show the complete
factors to calculate number of moles, then the molar ration and finally the empirical formula.
1. Calcium bromide is a compound used in photography and the manufactur of fire extinguishing
materials. Analysis of a 20.00 gram sample of calcium bromide yields 4,02 grams of calcium and
15.95 grams of bromine. Calculate the number of moles of both calcium and bromide, then
determine the mole ratio to write an empirical formula for calcium bromide,

Answers

The empirical formula of the compound (calcium bromide) is CaBr₂

From the question given above, the following data were obtained:

Ca = 4.02 g

Br = 15.95 g

Empirical formula =?

Divide by their molar mass to obtain their mole

Ca = 4.02 / 40 = 0.1005 mole

Br = 15.95 / 80 = 0.199 mole

Divide by the smallest to obtain the mole ratio

Ca = 0.1005 / 0.1005 = 1

Br = 0.199 / 0.1005 = 2

Therefore, the empirical formula of calcium bromide is CaBr₂

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Solve the following problem. What is the mass of the object if it has a density of 657 g/mL and a volume of 32 mL?

Answers

Answer:

21,024 g

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 657 × 32 = 21,024

We have the final answer as

21,024 g

Hope this helps you

658 mL of 0.250 M HCl solution is mixed with 325 mL of 0.600 M HCl solution. What is the molarity of the resulting solution

Answers

The molarity of the resulting solution obtained by mixing 658 mL of 0.250 M HCl solution with 325 mL of 0.600 M HCl solution is 0.366 M

We'll begin by calculating the number of mole of HCl in each solution. This can be obtained as follow:

For solution 1:

Volume = 658 mL = 658 / 1000 = 0.658 L

Molarity = 0.250 M

Mole of HCl =?

Mole = Molarity x Volume

Mole of HCl = 0.250 × 0.658

Mole of HCl = 0.1645 mole

For solution 2:

Volume = 325 mL = 325 / 1000 = 0.325 L

Molarity = 0.6 M

Mole of HCl =?

Mole = Molarity x Volume

Mole of HCl = 0.6 × 0.325

Mole of HCl = 0.195 mole

Next, we shall determine the total mole of HCl in the final solution. This can be obtained as follow:

Mole of HCl in solution 1 = 0.1645 mole

Mole of HCl in solution 2 = 0.195 mole

Total mole = 0.1645 + 0.195

Total mole = 0.3595 mole

Next, we shall determine the total volume of the final solution.

Volume of solution 1 = 0.658 L

Volume of solution 2 = 0.325 L

Total Volume = 0.658 + 0.325

Total Volume = 0.983 L

Finally, we shall determine the molarity of the resulting solution.

Total mole = 0.3595 mole

Total Volume = 0.983 L

Molarity =?

Molarity = mole / Volume

Molarity = 0.3595 / 0.983

Molarity = 0.366 M

Therefore, the molarity of the resulting solution is 0.366 M

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HELP ASAP
What experiments did Neils Bohr complete for the atomic theory?

Answers

Answer:

I don't know.

Explanation:

I'm not very smart

Increase in pressure affects which of the following states in chemical reactions? A Solid only B Liquid only С Gas only D All of the above​

Answers

Answer:

D All of the above

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What is the mass of 2.49 moles of sucrose?

Answers

your anwser would be 342 gmol  Please mark branliest

Just get out that Periodic Table of the Elements, find the atomic masses for each atom, and add them up!

Carbon = 12

Hydrogen = 1

Oxygen = 16

C=12×12=144

H=1×22=22

O=16×11=176

Sucrose =144+22+176=342gmol

A student wants to conduct an investigation on vapor pressure Which statement describes how vapor pressure is related to an observable phase change?

A liquid boils when the vapor pressure equals the boiling point.
A liquid freezes when the vapor pressure equals the melting point.
A liquid freezes when the vapor pressure equals the atmospheric pressure.
A liquid boils when the vapor pressure equals the atmospheric pressure.

Answers

The Whole Electrical Bonding Investigation Plan Quick check

1) B. boiling point, surface tension, vapor pressure

2) A. glycerin

3) C. the temperature at which additional heat energy causes the substance to change from a liquid to a gas

4) D. Heat each substance in liquid form to its boiling point. Measure the temperature of each substance

5) A. A liquid boils when the vapor pressure equals the atmospheric pressure.

JWhat type of evidence is gathering information through your senses or using scientific tools?

Predictions
Results
Scientific research
Observations

Answers

Observations etc etc
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