Answer:
[tex]E=1.989*10^{-32}J[/tex]
Explanation:
From the question we are told that:
Frequency [tex]f=3 * 10 Hz[/tex]
Generally the equation for Energy of an electromagnetic wave is mathematically given by
[tex]E=hf[/tex]
Where
h=Planck's constant
[tex]h=6.62607015 * 10^{-34}[/tex]
Therefore
[tex]E=6.62607015 * 10^{-34}*3 * 10[/tex]
[tex]E=1.989*10^{-32}J[/tex]
draw a diagram of the structure of the following atoms and state their electron arrangement:
(i) Mg
(ii)Ca
The diagrams of the arrangement of the electrons in calcium and magnesium have been shown in the image attached to this answer. There are two electrons in the valence shell of calcium.
How are the electrons arranged?We know that the electrons are the subatomic particles that we can be able to see in the shells of the atom. It is important that we ought to know that the electrons are the particles that are known to be responsible for the reactivity of the atom.
The number of the electrons that we can find in the atom would depend on the number of the protons that we have in the nucleus of the atom and this is because for the atom to be electrically neutral then we would have to have the same number of electrons and protons being in the atom as we know.
It is clear that calcium is a member of group two of the periodic table and that magnesium is also a member of group two of the periodic table.
The structures for calcium would have Ca and two dots while that of magnesium would have Mg and two dots.
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Potassium Permanganate is used for purifying drinking water, because
A. it is a sterilising agent
B. it dissolves the impurities of water
C. it is a reducing agent
D. it is an oxidising agent
Answer:
D. it is an oxidizing agent
Explanation:
Which state of matter consists of particles that cannot be compressed and form a definite shape?
A. Gas
B. Liquid
C. Plasma
D. Solid
The solid does not consist of that particle which can not be compressed and have a definite shape.
What is solid?One of matter's four basic states is solid. A solid's molecules are tightly packed and carry the minimum amount of kinetic energy. A solid's structural stiffness and resistance to a force applied to its surface define it. Although they are locked in fixed locations, they do vibrate. Solids have a defined structure and volume and cannot flow since the particles do not move. Solids are difficult to crush because the particles are often so close together.
What is particles?A particle is a small, localized object to which numerous physical or chemical qualities, like volume, density, or mass, can be assigned.
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Why are all of the elements in group 18 relatively un reactive whereas those in group 17 are very reactive?
All of the elements in group 18 are relatively un-reactive whereas those in group 17 are very reactive because group 18 elements have complete outer shell and group 17 needs only one electron to complete octet.
In the periodic table , the group 18 elements are called as the noble gases. the group 18 elements have the complete octet that mean the complete valence shell and they are stable due to which they are un reactive and also called as inert gases.
In the group 17 , the elements are called as halogens. the group 17 elements have the incomplete outer shell and they only need one electron to complete their octet due to which they are very reactive.
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Which equation obeys the law of conservation of mass? h2(g) o2(g) → h2o(g) h2(g) o2(g) → h2o(g) 4he(g) 2h2(g) o2(g) → 2h2o(g) h2(g) → h2o(g) h2(g) o2(g) → 2h2o(g)
2H(g) + [tex]O_{2}[/tex] ⇒ 2H2O This equation obeys the law of conservation of mass.
The law of conservation of mass states that mass is neither created nor destroyed in chemical reactions. For example, carbon atoms in coal become carbon dioxide when burned. A carbon atom changes from a solid structure to a gas, but its mass remains the same.
In a chemical reaction, the mass of the chemical components before the reaction equals the mass of the components after the reaction. Therefore, for chemical reactions and low-energy thermodynamic processes in isolated systems, the total mass of reactants or starting materials must equal the mass of the products.
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A sample of gas has a pressure of 3.4 atm at 300 K in a container with a fixed volume. What will be the pressure (in atm) of this same sample of gas if the temperature is changed to 402 K
If the temperature is raised to 402 K, the pressure (in atm) of this given sample of gas will be 4.5.
Given,
Pressure P1 = 3.4 atm
Temperature T1 = 300 K
⇒ T2 = 402 K
⇒ P2 = ?
⇒ P1/T1 = P2/T2
⇒ 3.4/300 = P2/402
⇒ P2 = 4.5
⇒ Pressure = 4.5 atm
An atmosphere (atm) is a measuring unit that corresponds to the average air sea level pressure at 15 degrees Celsius (59 degrees Fahrenheit). One atmosphere consists of 1,013 millibars of pressure, or 760 millimetres (29.92 inches) of mercury.
Pressure is defined as the force exerted by one material on another per unit area. The force also that gas exerts on the container limits is defined as gas pressure. Gas molecules travel at random over the specified volume. They clash with the surface as well as each other during this movement.
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You want to sweeten a cup of tea, and you have three types of sugar: sugar cubes (volume: 5ml), granulated sugar (volume: 0.1 ml), and powdered sugar (volume: 0.0001 ml). Which sugar would dissolve the fastest? Why?
Answer:
powdered sugar
Explanation:
The higher is the exposed area of sugar, the faster is the dissolution process. Thus, to choose between the different types of sugar, we have to look at the volume occupied by the sugar.
In sugar cubes, the particles of sugar as compacted in a cube, so the particles inside the cube are not exposed to the solvent (water). So, sugar cubes have the slowest dissolution process. Then, in granulated sugar, the particles have more area exposed, so this type of sugar will dissolve faster than sugar cubes. Finally, powdered sugar is composed of tiny particles with more are exposed, so powdered sugar has the fastest dissolution process.
Therefore, powdered sugar will dissolve the fastest.
If 33.0 grams of hydrogen gas react with 300. grams of oxygen gas, what is the percent yield if an experiment produces 250. grams of water? Use the balanced equation from question 3.
Answer:
can you show us question 3 pls
Explanation:
Which component is missing from the process of photosynthesis? carbon dioxide water _________ → glucose oxygen sunlight sugar plants carbon
The component missing from the process of photosynthesis is carbon dioxide. Carbon dioxide is an essential component of photosynthesis as it is used by plants to create glucose, which is the primary energy source for plants.
What is Carbon dioxide?Carbon dioxide (CO2) is a colorless, odorless gas that is produced when carbon-containing compounds are burned. It is one of the most abundant trace gases that make up the Earth’s atmosphere. Carbon dioxide is important in the Earth’s natural cycle of life as plants use it to produce food through photosynthesis, while animals and humans exhale it as a waste product. In the atmosphere, carbon dioxide acts as a greenhouse gas and helps regulate the Earth’s temperature.
Carbon dioxide is taken in by the leaves of the plant and then combined with water and energy from sunlight to form glucose. Without carbon dioxide, photosynthesis would not be possible.
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Answer: The Correct Answer is A. Sunlight
Carbon Dioxide + Water + Sunlight → Glucose + Oxygen
Explanation: I took the test and got it right.
Have a Great Day.
Which of the following statements is true?
A. The change in freezing point of a solution is directly proportional to the number of
solute particles in the solution and dependent on the type of particle.
B. The change in freezing point of a solution is directly proportional to the number of
solute particles in the solution and independent of the type of particle.
C. The change in freezing point of a solution is inversely proportional to the number
of solute particles in the solution and dependent on the type of particle.
D. The change in freezing point of a solution is inversely proportional to the number
of solute particles in the solution and independent of the type of particle.
Answer:
The effect of adding a solute to a solvent has the opposite effect on the freezing point of a solution as it does on the boiling point. A solution will have a lower freezing point than a pure solvent. The freezing point is the temperature at which the liquid changes to a solid.
Explanation:
Hope this helps :3
The change in freezing point of a solution is inversely proportional to the number of solute particles in the solution and dependent on the type of particle,is the the TRUE statement.
What is meant by freezing point?Freezing point, temperature at which a liquid becomes a solid. As with the melting point, increased pressure usually raises the freezing point. The freezing point is lower than the melting point in the case of mixtures and for certain organic compounds such as fats.The change in freezing point of a solution is inversely proportional to the number of solute particles in the solution and dependent on the type of particle,is the the TRUE statement.
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Please show work image below includes the questions.
Answer:
Calcium nitride (Ca3N2)
148.25 g/mol is the molar mass
6. Which subatomic particle has no charge?
O proton
O electron
O neutron
Answer:
O Neutron
Explanation:
Answer:
the anwser is
electronHOPE IT HELPEDIf you need 18.9 grams of HCl for a reaction, and you have a 1.5 M solution of HCl, how many mL of this solution should you use
If we need 18.9 grams of HCl for a reaction, and we have a 1.5 M solution of HCl, the mL of this solution should we use is 345.3 mL.
Given that :
mass of the HCl = 18.9 grams.
molar mass of the HCl = 36.45 g/mol
moles of the HCl = mass / molar mass
= 18.9 / 36.45
= 0.518 mol
the molarity of the HCl = 1.5 M
The molarity is given as:
molarity = moles / volumes
volume in L = moles / molarity
= 0.518 / 1.5
= 0.3453 L
= 345.3 mL
Thus, the volume is 345.3 mL.
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Express the composition of each compound as the
mass percent of its elements (percent composition).
a.
sucrose (C,H),0.,)
c. magnetite (Fe,O.)
b.
aluminum sulfate
(Al, (SO,).)
The composition of each compound as the mass percent of its elements is as follows:
For Sucrose - Carbon is 42.18%, Hydrogen is 6.44% and Oxygen is 51.38%.For Aluminum sulfate - Aluminum is 3.99%, Sulfur is 4.57% and Oxygen is 87.44%.For Magnetite - Iron is 71.83% and Oxygen is 28.17%.What is mass percent?Concentration is expressed as mass percent. Additionally, the ingredients in a particular mixture are described. Solution composition can be understood in terms of mass percent. It indicates the mass of solute present in a solution of a given mass. The amount of solute is expressed in mass or moles.
Mass Percent = (Component Mass ÷ Total Mass) x 100% or
(mass of solute ÷ mass of solution) x 100%
a. Sucrose (C₁₂H₂₂O₁₁) with molecular mass of 342.296 u composed of:
Carbon: (12 x 12.01) / 342.296 = 42.18%
Hydrogen: (22 x 1.01) / 342.296 = 6.44%
Oxygen: (11 x 16) / 342.296 = 51.38%
b. Aluminum sulfate (Al₂(SO₄)₃) with molecular mass of 342.14 u is composed of:
Aluminum: (2 x 26.98) / 342.14 = 3.99%
Sulfur: (3 x 32.06) / 342.14 = 4.57%
Oxygen: (18 x 16) / 342.14 = 87.44%
c. Magnetite (Fe₃O₄) with molecular mass of 231.534 u is composed of:
Iron: (3 x 55.85) / 231.534 = 71.83%
Oxygen: (4 x 16) / 231.534 = 28.17%
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6. ( i’ll award the brainliest and any “links” will be reported)
sodium metal reacts with water and produces aqueous sodium hydroxide and hydrogen gas
a. Translate the word equation, and write the complete and balanced chemical equation.
b. What volume of hydrogen gas can be produced from reacting 5.67 grams of sodium metal with excess
water?
C. What is the percent yield if 964.00 mL of H, are collected through experimentation?
Answer: 2Na+2H2O------>2NaOH+H2
b) From the equation two moles of sodium gave one mole of hydrogen.
At stp the volume of hydrogen is 22400cm3.
The molar mass of sodium is 23
So we have
2molesNa--->1moleH2
5.76moles--->? mole H2
Meaning
2(23)Na----> 22400cm3 ofH2
5.67Na---->?H2
22400×5.67÷ 2(23)
127008÷46=2761.04cm3
Sorry I can't do the last one.
HELP FOR MY FINAL PLEASE PLEASE
For average speed, we divide the total distance covered by the total time taken.
After doing that, you will see that Jane has the lowest average speed.
If you see an uncharacterized container that has a white crystalline residue on the outside, what should you do
The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later
Ninety-seven years is the half-life of 90Sr. A sample of 90Sr would still have 0.015 of its original atoms after 175 years. The duration needed for a quantity to fall to half its starting value is known as the half-life.
The phrase is frequently employed in nuclear physics to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last. One or more electrons are attached to the nucleus of every atom, which is made up of a nucleus. Protons and neutrons, in various numbers, make up the nucleus. Neutrons exist only in the most prevalent type of hydrogen. Atoms that are neutral or ionised are the building blocks of all solids, liquids, gases, and plasma.
[A]t=[A]o/[A]t=4.18 [A]o/[A]t=e4.18=65.5
[A]o = 1.5%[A]o], where [A]t = 0.015
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When students work in a chemistry lab, the location of which item would be the most important for each student to know?
A.broom and dust pan, in case the student needs to sweep up broken glass
B.baking soda, in case the student needs to neutralize an acid spill
C.ice maker, in case the student needs to cool off hot glassware
D.safety shower, in case a chemical is spilled on the student’s body
Answer:
answer is D. safety shower, in case a chemical is spilled on the student’s body on edge 2020
Explanation:
have a great day peeps :)
It is important for student's to know the location of safety shower, in case a chemical is spilled on the student’s body which can be avoided by wearing proper personal protective equipments.
What are personal protective equipments?
Personal protective equipment is a protective clothing which is worn to protect the wearer's body from hazard or injury.The hazards which can be addressed by the use of personal protective equipment are physical,chemical and bio hazards.
It imposes a barrier between the user and the working environment.The main purpose of personal protective equipment is to reduce exposure of employees to the hazards.
It has a limitation that it does not eliminate the hazard and may lead to harm to the employee if the equipment is damaged.
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Help me with this question please.
Explanation:
conduction because it has succession
Draw plausible electron dot structures for the following substances. Each substance contains only single covalent bonds. A. I2 B. OF2 C.H2S D.NI3.
The plausible electron dot structures of I₂, OF₂, H₂S, NI₃ substances are attached below.
How is an electron dot structured?Lewis dot structures, also known as electron dot structures, are diagrams that show how atoms in a molecule are chemically bonded to one another. They also show how many lone pairs there are in total among all the atoms that make up the molecule.
An electron configuration writing guide. The shell number (n) comes first in the symbols used to represent the electron configuration, followed by the type of orbital and, finally, a superscript that represents the number of electrons in the orbital. Examples include As you can see from the periodic table, oxygen has 8 electrons.
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The first substance is nitric acid, HNO3. Since this substance dissolves to generate an acidic solution, the bond between O and H in the structural formula NO2OH breaks when the substance dissolves, making it an oxyacid. The latter substance, Ni(OH)2, is apparently insoluble in neutral water, but will dissolve if the solution is acidic. This behavior is typical of substances that feature basic anions. The bond between Ni and O is the one that breaks when Ni(OH)2 dissolves. The hydroxide ion that is produced quickly reacts with protons in solution and cannot react again with Ni2 to form a precipitate.
Ni(OH)₂ is base but this is not strong base this is very weak base and this cannot gives OH⁻ after dissolving in H₂O . this is only dissolve in acidic solution.
Define acidic solution.A solution is said to be acidic if it contains more positively charged hydrogen ions (H⁺) than negatively charged hydroxide ions (OH⁻). Lemon juice and vinegar are typical examples of acids. The amount of OH ions is greater in bases. Baking soda and regular ammonia are common examples.
Acidic substances can typically be distinguished by their sour flavor. A basic definition of an acid is a molecule that can donate an H⁺ ion and can continue to be energetically favorable even after losing H⁺. Blue litmus paper has a reputation for turning red when exposed to acids. Bases, on the other hand, are distinguished by their bitter flavor and slick consistency.
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Consider the combustion of propane:
C3H8 +502 3CO2 + 4H₂O
- →
Which of the following unit factors below is correct? (Select all that may apply)
A. There are 5 oxygen molecules reacting for every six oxygen atoms produced in CO2.
B. There are 5 oxygen atoms reacting for every 3 CO₂ molecules produced.
C. There are 10 oxygen atoms reacting for every four water molecules produced.
D. There are 10 oxygen atoms reacting for every six oxygen atoms produced in CO2.
Four water molecules are created for every ten oxygen atoms that are reacting.
Propane:A three carbon alkane, propane has the chemical formula C3H8. At room temperature and pressure, it is a gas, but it can be compressed into a liquid for transportation.
What is the primary use of propane?Its primary applications include home and water heating, food preparation and storage, clothing drying, and the powering of industrial and farm machinery. The production of plastics and other chemicals in the chemical sector also uses propane as a raw ingredient.
What are propane's three drawbacks?Cons of propane heating
Compared to oil heating, propane produces fewer BTUs per gallon.Equipment that burns propane is frequently more expensive to buy than heating systems that use heating oil.To use the apparatus properly, care must be taken because propane is flammable in air.To know more about alkane :
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at what temperature will the mass of 198g of carbon dioxide gas at 2 atmospheric pressure take up to a volume of 35l? (gas constant= 0.0821L atm.
Answer:
The temperature will be 189.70 K.
Explanation:
Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P*V = n*R*T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
In this case:
P= 2 atmV= 35 Ln= 198 g* [tex]\frac{1 mole}{44 g}[/tex] = 4.5 moles (where 44 g/mole is the molar mass of carbon dioxide)R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= ?Replacing:
2 atm* 35 L= 4.5 moles* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] * T
Solving:
[tex]T=\frac{2 atm* 35 L}{4.5 moles* 0.082\frac{atm*L}{mol*K} }[/tex]
T= 189.70 K
The temperature will be 189.70 K.
Please help!
Given the following reaction,
3H2SO4(aq)+Ca3(PO4)2(s)⟶3CaSO4(s)+2H3PO4(aq)
If 1.25x10^5 kg of H2S)4 react, how many kilograms of H3PO4 are produced?
Thank you!
Answer:
8.3 × 10⁴kg
Explanation:
Solution in the diagram
33.0 g of Ni represents how many atoms?
1.99 x 10²⁵ atoms
0.562 atoms
3.39x 10²³ atoms
5.48 x 10^-23 atoms
3.22 x 10^-21 atoms
if a reaction takes place using all oxygen available and leaving hydrogen available:
Answer:
If a reaction takes place using all oxygen available and leaving hydrogen available, then oxygen is the limiting reactant.
Explanation:
The reaction used up all the oxygen and left over some hydrogen, so oxygen is the liting reactant.
Determine 4.86×10^24 atoms Au to grams
The mass of 4.86 × 10²⁴ Au atoms is equal to 1589.6 g.
What is Avogadro's number?Avogadro’s number can be used to express the number of entities such as molecules, atoms, ions, electrons, or protons in one mole of any substance.
The value of Avogadro’s constant is equal to 6.022 × 10²³ per mole.
Given, the number of atoms of the Au = 4.86 × 10²⁴
The atomic mass of the Au = 197 g/mol
So 6.022 × 10²³ atoms of Au have mass = 197 g
Then 4.86 × 10²⁴ Au atoms will have mass = 1589.6 g
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Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there
Thus, Option (C) Glucose has a maximum of 72 C-atoms per gram. The components of fossil fuels are decaying plants and animals.
These fuels may be burned to provide energy and can be found in the crust of the Earth. An example of a fossil fuel is coal, as well as oil and natural gas. Due to the hydrocarbons and other carbon-based compounds they contain, fossil fuels are valuable as energy sources. Any of a class of organic molecules made solely of carbon and hydrogen are known as hydrocarbons. The hydrogen atoms adhere to the carbon atoms, which serve as the "skeleton" or framework. Because they were generated from the petrified, buried remains of plants and animals that once lived millions of years ago, coal, crude oil, and natural gas are all referred to as fossil fuels.
The complete question is- Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 875 million years, what fraction of the initial 14C atoms is still there?
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Safety standards require a pool to add 333 chlorine tablets to every 2{,}0002,0002, comma, 000 liters of water. Today, the lifeguards at Park Pool added 888 chlorine tablets to their pool's 10{,}00010,00010, comma, 000 liters of water. How does Park Pool's chlorine compare to the safety standards
Compared to safety standards, that would be too little chlorine:
10,000 gallons is five times as much water as 2,000.
Therefore, Park's pool needs five times as much chlorine as is required for 2,000 gallons to meet safety regulations.
5 times 3 pills of chlorine equals 15 tablets. For Mark to meet safety standards, 15 chlorine tablets would be required. Use one three-inch tablet for every 10,000 gallons of pool water rather than stuffing your chlorinator or floater to the brim with tablets. This quantity of pills should be sufficient to maintain a good chlorine level if you shock your water once a week.
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