Which of the elements shown has an atomic mass of 20 amu?

Answer:-

Try this formula:

W= Fd

F = W by d

Explanation:-

(Note: A newton-meter is the same thing as a joule, so the units for work are the same as those for energy – joules).

The force required to lift a rock at a vertical distance of 8 m if 80 j of work were done is 10 N.

A force is an effect that can alter an object's motion. Due to force, an object with mass can change its velocity, or accelerate.

Given,

Distance is 8 m

work done is 80 j

Now by the formula of work

[tex]\bold{Work = force \times distance}[/tex]

[tex]80= F\times 8\\\\F= \dfrac{80}{8} = 10 N[/tex]

Thus, the force required is 10 N.

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Out of the three you gave ecosystem is what I would call the most broad. An ecosystem includes living AND non-living things in an area

Community is all the LIVING things in an area (plants are included and I think bacteria is too, but I'm not sure)

Population is pretty narrow it just looks at specific species in one area. Population of mosquitoes doesn't include butterflies, if only looks at mosquitoes

Hope this helped!

Answer: Thermal Energy

Explanation:

Answer:

Hot water has kinetic energy

Explanation:

That is an energy that involves movement. Kinetic energy water causes flows and make waves exist

Answer:

The molar mass of copper (II) nitrate is 187.5 g/mol.

Explanation:

The molar mass is the mass of all the atoms in a molecule in grams per mole. To calculate the molar mass of a molecule, we first obtain the atomic weights from the individual elements in a periodic table. We then count the number of atoms and multiply it by the individual atomic masses.

Answer:

Alpha has the greatest mass- A.

Answer: The correct answer is Option A.

Explanation:

For the given options:

Alpha decay is defined as the process in which alpha particle is emitted. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a mass of 4 units.

[tex]_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\alpha[/tex]

Beta decay is defined as the process in which beta particle is emitted. In this process, a neutron gets converted to a proton and an electron. The beta particle does not have any mass.

[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+_{-1}^0\beta[/tex]

Gamma decay is defined as the process in which an unstable nuclei gives off excess energy by a spontaneous electromagnetic process and thus releases [tex]\gamma -radiations[/tex]. These radiations does not have any mass.

[tex]_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma[/tex]

Nuclear reactions are defined as the reactions in which change of nucleus takes place.

Hence, the correct answer is Option A.

Explanation:

FALSE

ITS NOT ALWAYS NECESSARY TO BE IN AN ORDER

An aerosol is a colloidal suspension in a gas, consisting of small particles or droplets that do not settle due to their small size. Examples include fog and smoke, where the dispersing medium is air. Understanding aerosols is important for their role in atmospheric processes and distinguishing them from other mixtures like solutions and suspensions.

An aerosol is a colloidal suspension in a gas. This means that an aerosol comprises tiny particles or droplets that are suspended within a gas. Unlike a suspension, where the particles can separate out over time due to their size (generally larger than 1 µm), the particles in a colloidal system, like an aerosol, do not settle because they are much smaller and range in size from about 2 to 500 nm. Aerosols can be composed of both solid and liquid particles dispersed in a gas, and these particles are stable enough not to settle quickly under the influence of gravity.

Examples of aerosols include fog, which consists of liquid water droplets dispersed in air, and smoke, which contains solid carbon particles also suspended in air. In both cases, the medium dispersing these particles is a gas (air), highlighting the defining characteristic of aerosols as a type of colloid. The significance of aerosols extends beyond simple examples, as they play integral roles in atmospheric processes, affecting weather, climate, and air quality, by influencing the scattering and absorption of radiation and serving as nuclei for cloud formation.

The ability of colloids, including aerosols, to scatter light, known as the Tyndall effect, further distinguishes them from solutions which are homogeneous mixtures and therefore do not exhibit this phenomenon. It's important to understand the distinction between aerosols and other types of mixtures, such as solutions and suspensions, to appreciate the unique physical and chemical behaviors of colloidal systems.

Answer:

Nuclear Fusion

Explanation:

This creates heat and protons that can heat up the sun

The core is composed of hot, dense plasma. The process nuclear fusion is responsible for the intense heat and pressure in the sun's core.

The process in which two lighter nuclei fuse together to form a heavier nucleus with the simultaneous release of a huge amount of energy is defined as the nuclear fusion.

Some mass is always lost during this process and this is converted into energy in accordance with Einstein's equation, E = mc². This huge amount of energy is released.

The fusion reactions are common in the interior of stars. The energy of our sun is believed to arise from a number of complex fusion steps. The net reaction is:

4 (₁¹H) → ₂⁴He + 2 (₊₁⁰e) + energy

During nuclear fusion in the core photons and neutrinos are released. These particles carry and emit the light, heat and energy of the sun.

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Final answer:

To find the grams of phosphorus in 500.0 grams of calcium phosphide, the molar mass of calcium phosphide is calculated, followed by the number of moles in the sample. The mole ratio then gives the moles of phosphorus, which is finally converted to grams, resulting in approximately 169.35 grams of phosphorus.

Explanation:

To determine the number of grams of phosphorus in 500.0 grams of calcium phosphide, we need to follow these steps:

Therefore, there are approximately 169.35 grams of phosphorus in 500.0 grams of calcium phosphide.

Ca3(PO4)2 is the answer.

Answer : The formula for the compound is [tex]Ca_3(PO_4)_2[/tex]

Explanation :

For formation of a neutral ionic compound, the charges on cation and anion must be balanced.

The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non-metals.

In the given question, the calcium metal forms an ionic compound with polyatomic anion (phosphate) [tex]PO_4^{3-}[/tex].

Here, calcium is having an oxidation state of +2 called as [tex]Ca^{2+}[/tex] cation and phosphate [tex]PO_4^{3-}[/tex] is an anion with oxidation state of -3. The charges are not balanced. So, the charges are balanced by the cris-cross method. Thus, the compound formed will be, [tex]Ca_3(PO_4)_2[/tex]

Hence, the formula for the compound is [tex]Ca_3(PO_4)_2[/tex]

Answer:

the axis is tilted at 98 degrees

Explanation:

Uranus is blue, not green; it has an atmosphere of hydrogen and helium, not methane.  While it does have an icy cold temperature, that's not a very unusual characteristic for an outer planet.  However, the tilt of the axis is unusual; no other planet is tilted almost completely on its side!

Answer:

Explanation:

In a solubility table you find:

In a chemical equation the states of soluble compounds is identified as aqeous, using the letter "aq" in parenthesis, and the state of insoluble compounds is identified as solid, using "s" in parenthesis.

Then, the reaction showing the states of the reactants and products is:

In the chemical reaction AgNO3 + KCl = AgCl + KNO3, the state symbols for each compound are provided - AgNO3 (aq), KCl (aq), AgCl (s), and KNO3 (aq).

The state symbols for each compound in the reaction AgNO3 + KCl = AgCl + KNO3 are:

Answer:

Explanation:

At constant pressure and temperature, the mole ratio of the gases is equal to their volume ratio (a consequence of Avogadro's law).

Hence, the complete combustion reaction that has a ratio of 100 ml of gaseous hydrocarbon to 300 ml of oxygen, is that whose mole ratio is 1 mol hydrocarbon : 3 mol of oxygen.

Then, you must write the balanced chemical equations for the complete combustion of the four hydrocarbons in the list of choices, and conclude which has such mole ratio (1 mol hydrocarbon : 3 mol oxygen).

A complete combustion reaction of a hydrocarbon is the reaction with oxygen that produces CO₂ and H₂O, along with the release of heat and light.

a. C₂H₄:

Precisely, for this reaction the mole ratio is 1 mol C₂H₄: 2 mol O₂, hence, this is the right choice.

The following analysis just shows that the other options are not right.

b. C₂H₂:

The mole ratio for this reaction is 2 mol C₂H₂ :5 mol O₂.

с. С₃Н₈

The mole ratio is 1 mol C₃H₈ : 5 mol O₂

d. C₂H₆

The mole ratio is 2 mol C₂H₆ : 7 mol O₂

Answer:

Gravity

Everything with mass has gravity

A thermodynamic quantity equivalent to the total heat content of a system

Answer:

a thermodynamic quantity to the total heat content of a system. it is equal to the internal energy of the system plus the product of pressure and volume. it is associated with a particular chemical process

Explanation:

i just looked up the definition.

the element first discovered in the sun is the element Helium. This noble gas is the second most abundant element in the universe and was discovered on the sun before it was discovered on the earth.

hope this helps :)

I believe it would be either the Density or the composition of its matter

It is the composition of matter

Answer:

C. Scientists may study and discuss organisms easily

The answer is ionic

Answer: Option (a) is the correct answer.

Explanation:

A bond where transfer of electrons take place from one atom to another is known as an ionic bond.

An ionic solution is defined as a solution in which an ionic compound is dissociated into ions.

For example, NaCl is an ionic compound and when it is dissolved in water it dissociates as [tex]Na^{+}[/tex] and [tex]Cl^{-}[/tex] ions.

As it is known that electric current is the flow of charges. Hence, a solution that contains ions will be a good conductor of electricity.

Whereas in general, a covalent solution does not contain any ions.

Thus, we can conclude that ionic solutions are good conductors of electricity.

Acetone may be rinsed over materials to wash off explosive residue.

The real solution to the residue issue is to use methods that actually rinse away cleaner.

Some solvents and steam vapor systems are examples of residue-free chemistry. Completely water soluble and rinseable, soap-free products for carpet and hard floor care are a valuable part of the professional cleaner’s arsenal of residue-free cleaners.

In clean areas, all exposed surfaces should be smooth, impervious and unbroken in order to minimize the shedding or accumulation of particles or microorganisms and to permit the repeated application of cleaning agents, and disinfectants where used.

Acetone may be rinsed over materials to wash off the explosive residue. This can then be analyzed by x-ray techniques. Advance in explosives that has been proposed. Use of small color chips. These chips would be added to explosive materials available to the public.

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Hello There!

The moloques are moving faster in warm soda, so the carbonation leaves the soda faster.

Answer:

Same as what BlueFox stated above EXCEPT it is gas molecules move faster in warm soda

Explanation:

making fun of his typo,,,

Atoms that have different numbers of neutrons than protons and electrons are called isotopes.

Isotopes are atoms of the same element so they have the same number of protons. But, they have different mass numbers which means they have a different number of neutrons.

Answer:

Sulfonic acid

Explanation:

I think this is correct

The name of the chemical formula [tex]S_4O_6[/tex] is tetrathionate.

The tetrathionate anion is sulfur that is produced by tetrathionic acid.

The ion has two sulfur atoms in oxidation state 0 and two sulfur atoms in oxidation state +5.

The structure of tetrathionate can be seen by following three corners of a cube.

Thus, Tetrathionate is the name of [tex]S_4O_6[/tex].

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Answer: By pushing it.

Explanation: If you push the pendulum, the energy from your hand to the pendulum will be transferred thus giving the pendulum more energy.

Answer:

266.2 g.

Explanation:

M = (no. of moles of KCl)/(Volume of the solution (L))

M = 2.47 M.

no. of moles of KCl = ??? mol,

Volume of the solution = 1445.71 mL = 1.44571 L.

∴ (2.47 M) = (no. of moles of KCl)/(1.44571 L)

∴ (no. of moles of KCl) = (2.47 M)*(1.44571 L) = 3.571 mol.

no. of moles of KCl = mass/molar mass

∴ mass of KCl = (no. of moles of KCl)*(molar mass) = (3.571 mol)*(74.55 g/mol) = 266.2 g.

132 pounds.  As you stated, their weight is 60 kg and 60 kg = 132.77 pounds

Answer:

to make it more simple its A and D

Explanation:

edge

Arrhenius bases are the species that release hydroxide ions in the solution. Barium hydroxide and Caesium hydroxide are examples of Arrhenius bases.

Arrhenius bases are the chemical compounds that increase the concentration of the hydroxide ion in a solution when gets ionized. Whereas the acids release hydrogen ions when dissolved in water.

Barium hydroxide and Caesium hydroxide are the chemical species when dissolved in water will completely dissociate to release hydroxide ions and are the strong bases.

Therefore, option A. barium hydroxide and option D. cesium hydroxide are Arrhenius bases.

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Answer:

[tex]\boxed{\text{The atomic number increases}}[/tex]

Explanation:

That's because each time you move one atom to the right, you add a proton to the nucleus, and the atomic number is the number of protons in the nucleus.

Answer:

The ratio between protons to electrons is not 1:1

Explanation:

A normal atom will be neutral in charge having 1 electron for each atom. An Atom that gains or looses an electron loses that perfect ratio. It is positive is electrons are loss and negative if electrons are gained.