Pls help with question 10

Answer:

The moles of potassium that you would need to prepare 1200 g of 5% potassium sulfate solution is 1.538 moles

Mg + HCl → MgCl_2 + H_2

(─.─||）

Answer:

Magnesium + hydrochloric acid → Magnesium chloride + hydrogen gas

Explanation:

acid + reactive metal (magnesium) → salt + hydrogen gas

Answer:

about 100 degrees Celsius

Explanation:

i dont cap

According to Avogadro's law equal volume of all gases at the same temperature and pressure contain equal number of molecules. At STP one mole of any gas behaving ideally occupies a volume of 22.414 L.

The volume occupied by one mole of a substance at a given temperature and pressure is defined as the molar volume at that temperature and pressure. The value of molar volume of an ideal gas at STP is important in stoichiometric calculations.

At STP, the number of molecules of a gas is given as:

Number of molecules of a gas (N) = V₀ in L /  22.414 × 6.022 × 10²³

Here  V₀ in L = 16500 = 16.5 L

N =  16.5 / 22.414  × 6.022 × 10²³

N = 4.433 × 10²³

Thus the number of molecules present is 4.432 × 10²³.

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Let's see the balanced equation

[tex]\\ \rm\Rrightarrow 2Ca+O_2\longrightarrow 2CaO[/tex]

Hence

As moles are equal given

Explanation:

1,it's crystal clear water and unique wild life.

2,It is home to many unique species animals and plants.

3, It's sediment have not been scoured by overriding continental ice sheet

Answer:

"The Roman numeral denotes the charge and the oxidation state of the transition metal ion. For example, iron can form two common ions, Fe2+ and Fe3+. To distinguish the difference, Fe2+ would be named iron (II) and Fe3+ would be named iron (III)."

Explanation:

In chemistry, Roman numerals are used for a specific group of elements called transition metals. The Roman numerals indicate the charges that these metals carry in a compound.

Answer:

true

Explanation:

Covalent bonds are formed through the overlap of half-filled valence orbitals. Because of the overlapping, it is most probable that electrons are located within the region of the bond.

In order to make a covalent bond, the orbitals on each atom in the bond must overlap. Therefore, the given statement is true.

A covalent bond is an electron exchange usually results in the production of electron pairs between atoms. These electron couples are referred to as bonding pairs as well as sharing pairs. Covalent bonding seems to be the permanent equilibrium of atoms' forces of attraction versus attraction when atoms share electrons.

Because to electron sharing, each atom in a number of molecules can achieve the corresponding amount of the valence shell, resulting inside a stable electronic configuration. In organic chemistry, covalent bonds are far more common than ionic ones. In order to make a covalent bond, the orbitals on each atom in the bond must overlap.

Therefore, the given statement is true.

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Answer:

A high pressure area is an area where the air sinks. As it does, it warms up by the adiabatic effect of a greater pressure and that causes the clouds to evaporate, giving place to a clear sky

Explanation:

A high-stress area, high, or anticyclone, is a location in which the atmospheric stress on the surface of the planet is more than its surrounding environment.

In a high-Pressure system, it has better pressure in its center than in the regions around it. Winds blow away from excessive pressure.

Swirling withinside the contrary route from a low-stress system, the winds of an excessive pressure system rotates clockwise north of the equator and counterclockwise south of the equator.

Hence, these are the characteristics of high-pressure system.

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A chemist dilutes a 1.0 ml sample of 2.0M KNO₃ by adding water to it. If the concentration of the solution that is obtained is 0.0080 m, then its volume is 250mL.

Volume for the given equation will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

M₁ = molarity of KNO₃ = 2M

V₁ = volume of KNO₃ = 1mL

M₂ = molarity of final solution = 0.0080M

V₂ = volume of final solution = ?

On putting these values on the above equation, we get

V₂ = (2)(1) / (0.0080) = 250mL

Hence option (2) is correct.

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Answer:

B. 250 mL

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer:

When hydrochloric acid comes into contact with calcium carbonate, the following chemical reaction ensues: CaCO3 + 2HCl → CaCl + CO2 + H2O, which provides acid neutralization alongside the formation of byproducts

Answer:

C) liquid

Explanation:

edge 2023

Answer:

hormones or D

Explanation:

:-)

Answer:

D. Hormones

Explanation:

Endocrine glands release hormones into the bloodstream. This lets the hormones travel to cells in other parts of the body.

Answer:

Vinyl chloride is an organochloride with the formula H2C=CHCl that is also called vinyl chloride monomer (VCM) or chloroethene. This colorless compound is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC).

Explanation:

Answer:

CH2=CHCl

Explanation:

Answer:

I think C is the answer

Explanation:

because Mitosis results in two identical daughter cells......

Answer:

Below

Explanation:

The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample

Answer:

1. the imbalance of positive and negative charges.

Explanation

The electric dipole moment is a measure of the separation of positive and negative electrical charges within a system, that is, a measure of the system's overall polarity.

2.The atmosphere has recently changed and is mostly greenhouse gases, which have a large impact on climate

Explanation.

They cause climate change by trapping heat, and they also contribute to respiratory disease from smog and air pollution. Extreme weather, food supply disruptions, and increased wildfires are other effects of climate change caused by greenhouse gases.

3.melted ice caps

explanation

A stronger greenhouse effect will warm the ocean and partially melt glaciers and ice sheets, increasing sea level. Ocean water also will expand if it warms overexcessively.

4.Yes, the greenhouse effect keeps the planet warm enough to support life.

Explanation

The greenhouse effect is a good thing. It warms the planet to its comfortable average of 59 degrees Fahrenheit (15 degrees Celsius) and keeps life on earth, well, livable. Without it the world would be a frozen, uninhabitable place, more like Mars.

5.nitrous oxide.

Explanation

There are several different types of greenhouse gases. The major ones are carbon dioxide, water vapor, methane, and nitrous oxide. These gas molecules all are made of three or more atoms. The atoms are held together loosely enough that they vibrate when they absorb heat.

The phrase which  describes a dipole moment is the separation of positive and negative charges,the  statement best summarizes the presence of greenhouse gases in the atmosphere , the atmosphere is mostly non-greenhouse gases, but the small amount of greenhouse gases in an ecosystem have a large impact on climate.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .The more glaciers is the consequence is due to increased production of greenhouse gases.The greenhouse effect keeps the planet warm enough to support life. Nitrous oxide molecule acts as a greenhouse gas.

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The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.

Pressure can be defined as the force acting prpendicular per unit surface.

To calculate the pressure of chlorine gas, we use the formula below.

Formula:

Where:

Make P the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.

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[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]

The Correct choice is : D

if temperature is held constant, then they have same average kinetic Energy because there's no change in energy caused by transfer of heat or something.

According to the forces of attraction, if temperature is constant the particles have the same average kinetic energy.

Forces of attraction is defined as  a force by  means of which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in  case of gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as  the melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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The genetic constitution of an individual, group, or class.

Explanation:

transmission of mechanisms of inherited characteristics of organisms

Answer:a trait that can be passed down is within your gens Evan if you don’t show the trait you still have the ability to pass it down

Explanation:

The strategy that is not a suggested way of treating or preventing a communicable disease is to receive a vaccine while you are ill from a virus.

A communicable disease is a type of disease that can spread from one person to another in the following ways:

There are various ways to prevent the spread of communicable diseases which include:

To receive a vaccine while ill from a virus is not advisable because there may be chances of spreading your illness to health care workers who are administering the vaccine.

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The property of mixture which describes a mixture are it can be separated by physical methods, it can appear different from different sources and it cannot be described by a chemical symbol or formula.

Mixtures are the compounds which are formed by the addition or combination of one or two elements or compounds.

As in the mixtures many states of matters are present and it will be filtered by using various physical methods, and it is not chemically shown by single chemical symbol or formula. Mixtures are also of two types:

Hence options (1), (3) and (4) are correct.

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Answer:

The scientific name of the grasshopper is Caelifera.

Explanation:

hope this helps.

Answer:

caelifera

Explanation:

that’s the scientific name >_<

Answer:

The balanced equation is: H2 (g) +Cl2 (g) →2HCl (g)

Explanation:

Balancing chemical equation refers to balancing the stoichiometric coefficients on the reactants and products side. This must be done as the chemical equation obeys the law of conservation of mass and momentum.

The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation. The Law of conservation of mass governs the balancing of a chemical equation.

Given chemical equation

The balanced chemical equation for the hydrogen + chlorine -> Hydrogen Chloride.

H2 + Cl2 → 2HCl

The equation is balanced as on the reactants side there are two hydrogens present and the same on the products side. For chlorine as well the same thing goes two chlorine atoms on the reactants side and two on the products side.

For an impure sample of potassium hydrogen phthalate, the percentage of potassium hydrogen phthalate is

m'=39.3%

Generally, the equation for the mol base  is mathematically given as

mol base = M*V

mol base = 0.152*35.61

mol base = 5.41272 mmol

In conclusion

mass = mmol/1000*MW

m== 5.41272 /1000*204.22

m= 1.1053 g of KHP

Hence, m'=39.3%

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The original mass of krypton 81 that is present in the ice is 6.70 grams.

Original mass of any substance will be calculated as below for the decomposition reaction is:

N = N₀(1/2)ⁿ, where

N = remaining mass of krypton-81 = 1.675g

N₀ = original mass of krypton-81 = ?

n will be calculated as:
n = T/t, where

T = total time period = 458,000 years

t = half life time = 229,000 years

n = 458,000/229,000 = 2

Now putting all these values on the above equation, we get

N₀ = 1.675 / (1/2)²

N₀ = 6.70 g

Hence required mass is 6.70 g.

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Answer:

Atomic number shows u the amount of protons there are in the atom

The protons are equal to the number of electrons

The group number tells  you  the number of electrons on the outer shell

(Sorry if u didn’t want the extra info but really it’s simple like magnesium has 12 so it has 12 protons/ 12 electrons)

Answer:

To calculate the numbers of subatomic particles in an atom, use its atomic  number and mass number:

1. number of protons = atomic number.

2. number of electrons = atomic number.

3.number of neutrons = mass number - atomic number.

Answer:

2H2O

It's a double displacement reaction

Answer:

C

Explanation:

okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.

you can refer to your coursebooks :)

correct where wrong please:)