Help I’m so confused

Answer:

maybe not solid but a liquid yes

Answer:

yes

Explanation:

the molecules move

Answer:

has very different properties from sodium and chlorine

Explanation:

We know that salt (chemical name: Sodium Chloride) is made from two elements, Sodium (Na) and Chlorine (Cl). But the properties of the compound of sodium and chlorine has completely different properties than those of its elements: Sodium and Chlorine.

Sodium is quite a low density but highly reactive silvery white metal and Chlorine is a highly reactive greenish yellow gas. While salt (NaCl) is a crystalline material, white in color, which readily dissolves in water and is used as a condiment to add flavor to food.

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Answer: B) It presents the correct sequence of events in Earth’s history.

Explanation: edge 2021

Answer:

combination, decomposition, displacement, combustion, and disproportionation

Answer:

Number of neutrons

Explanation:

The mass number represents the number of protons and neutrons combined and the atomic number only represents the number of protons.

mass number - atomic number = number of neutrons

Answer:

mass number - atomic number = number of neutrons

Explanation:

The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. The mass number minus the atomic number represent the number of neutrons.

Answer:

Solution given:

heat[Q]=?

temperature [T]=0.64°C

specific heat capacity [c]=0.880 J/g °C

mass[m]=3g

we have

Q=mcT=3*0.880*0.64°=1.69Joule

the required heat is 1.69Joule.

[tex]\:[/tex]

1.69 J(joule) is your answer..!

Answer:

Then it can be easily concluded that 10.86 moles of water will be produced.

Answer:

10.9

Explanation:

trust i js did the assignment

Answer: I think 5

Explanation:

Balanced equations use the whole numbers to conserve the atomic numbers. When the reaction is balanced then 2 will be the coefficient in front of the Ag⁺.

A balanced reaction has symbols and whole numbers that represent the number of atoms and molecules of the reactants and the products in a reaction mixture.

The reaction between mercury and silver is shown as:

Hg + 2Ag⁺ → 2Ag + Hg²⁺

This can be checked by the redox half-reactions as:

2Ag⁺ + 2e⁻  →  2Ag⁰

Hg⁰  → Hg²⁺ + 2e⁻

Therefore, the silver cation gained two-electron and became a silver atom.

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Answer: The sign of ΔH° for the reaction is positive.

Explanation:

Given: [tex]\Delta G^{o}[/tex] = 155 kJ/mol (1 kJ = 1000 J) = 155000 J/mol

The relation between [tex]\Delta G^{o}[/tex] and [tex]\Delta H^{o}[/tex] is as follows.

[tex]\Delta G^{o} = \Delta H^{o} - T \Delta S[/tex]

As the given value of [tex]\Delta G^{o}[/tex] is positive. This means that on further calculation the value of [tex]\Delta H^{o}[/tex] will come out to be positive.

Thus, we can conclude that the sign of ΔH° for the reaction is positive.

In a closed system, the amount of the non-expansion work that can be done is called gibs free energy. The enthalpy cahnge will be positive.

The enthalpy of the system is given as the addition of products of the pressure and the volume with the internal energy of the system.

The Gibbs free energy is given by the formula:

[tex]\rm \Delta G^{\circ} = \Delta H ^{\circ} - T\Delta S[/tex]

When Gibbs's free energy is positive then the enthalpy will become positive.

Therefore, the enthalpy change will be positive.

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In the given question, [tex]7.949 \times 10^{24}[/tex] atoms are present in 13.2 mole of copper.

A mole is defined as the amount of a substance that contains exactly [tex]6.022\times 10^{23}[/tex] 'elementary entities' of the given substance.

The number of atoms in 13.2 moles of copper (Cu) can be calculated using Avogadro's number.

To calculate the number of atoms in 13.2 moles of copper, we can multiply the number of moles by Avogadro's number:

Number of atoms = [tex]\rm 13.2\ moles\ \times[/tex] [tex]6.022\times 10^{23}[/tex] atoms/mole

Number of atoms = [tex]7.949 \times 10^{24}[/tex] atoms

Therefore, in 13.2 moles of copper, there are approximately [tex]7.949 \times 10^{24}[/tex] atoms.

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Answer:

The chemical elements most likely to form covalent bonds are those that share electrons, such as carbon, as opposed to those that take them from another element to form an ionic bond. In general, they are nonmetals with similar electronegativities.

Explanation:

Answer:a

Explanation:

Answer:

Explanation:

use the equation

moles = mass/mr

=19.9/79.5

=0.250moles of CuO

then do the same for

H = 2.02/1

=2.02

so CuO is the limiting reagent because there is less amount of it.

Hope this helps  :)

Answer:

a) 300 L

b) 100 L

c) 12000 L

Explanation:

a) Amount of water required for 1 kg of Paper = 300 - 400 Kgs or liters

Amount of water water required for 1 Kg of steel = 704.9 L

It takes 300 L more water

b)  Amount of water required for 1 kg Potato = 300 liters

It takes 100 L more water

c)  Amount of water required for 1 kg Potato = 300 liters

Amount of water required for 1 kg beef = 15,415 liters

It takes 12000 L more water

Answer:

The molar mass and molecular weight of 3CaCl2 is 332.952. 

Solution :

From the balanced chemical equation, we can say that 1 moles of KBr will produce 1 moles of KCl .

Moles of KBr in 102 g of potassium bromide.

n = 102/119.002

n = 0.86 mole.

So, number of miles of KCl produced are also 0.86 mole.

Mass of KCl produced :

[tex]m = 0.86 \times Molar \ mass \ of \ KCl\\\\m = 0.86 \times 74.5 \ gram \\\\m = 64.07\ gram[/tex]

Hence, this is the required solution.

Answer:

C3H6

Explanation:

Among all the given option, the correct option is option 4. The formula of given chemical compound is C[tex]_3[/tex]H[tex]_6[/tex].

The chemical symbols make up the molecular formula. Additionally, it includes a list of the molecule's constituent elements as well as numeric subscripts that indicate the number of atoms in each element. It is a method of displaying data on the chemical ratios.

The chemical formula has no words and does not have a chemical name. A formula is not the same as a complete chemical molecular formula, despite the fact that it may suggest certain basic chemical structures. The formula of given chemical compound is C[tex]_3[/tex]H[tex]_6[/tex]. First, determine the molar mass formula. Then, divide the compound's molar mass by the expression for molar mass.

Therefore, the correct option is option 4.

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Answer:

65.21 percent

Explanation:

We are to find the percentage yield

We have this equation,

2no+o2 -->2no2

Such that 1500 kilograms/30grams

= Mno2/46

=1500/30 = mno2/46

We cross multiply from here

1500x46 = 30xMnO2

69000 = 30Mno2

69000/30 = MnO2

2300 = Mno2

The percentage yield would be

1500/2300 *100

= 0.6521 x 100

= 65.21%

This answers the question

Answer:

Sorry I want to help but I dont know the answer

One of the most commonly known catalysed reaction is that of Hydrogen Peroxide turning into Water

In this reaction, we can use Potassium Permanganate (KMnO₄) or Palladium (Pd) as a catalyst.

These catalysts helps Hydrogen Peroxide turn into water and oxygen

Catalyst: Substances that change the rate of a chemical reaction and themselves remain chemically unchanged after the reaction are called catalysts.

Example:- In the process of manufacturing of ammonia Fe is used as Catalyst.

[tex]N _{2} (g)+ 3H _{2} (g) \huge \rightarrow {}^{Fe}\rightarrow \small{3NH _{3}(g)}[/tex]

Note:- there is only one arrow. I was unable to put iron over the arrow ..

Answer:

1. sweep it instead

2.use a wateringcan with a percise nossole to water your plants efectivly 3.keep a jug of water in your frisge

Explanation:

Answer:

because it is made up of hydrogen

A star not explode if it is undergoing reactions similar to hydrogen bombs because the fusion processes' outward pressure prevents the stars from collapsing. The gravitational pull prevents the stars from bursting from within.

When two atoms collide to create a heavier atom, such as when two hydrogen atoms combine to create one helium atom, this process is known as fusion. The sun is powered by a similar mechanism, which generates vast amounts of energy.

Because of the enormous weight of the gas overhead, the Sun doesn't explode. The pressure caused by all the energy generated is precisely balanced.

The Sun would begin to collapse if the pace of fusion decreased, resulting in less energy being created in the sun's core.

Thus, The gravitational pull prevents the stars from bursting from within.

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mass of an atom is concentrated in the nucleus

Answer:

CaCl2

Explanation:

Answer:

UV filter cream

I will be hydrated and keep a wet cloth over my head

I do not live in Philippines

Answer:

1. Sunglasses protect my eyes from UV rays and reduce the risk of cataracts. They also protect the tender skin around your eyes from sun exposure. Sunglasses that block both UVA and UVB rays offer the best protection. Wrap-around sunglasses work best because they block UV rays from entering on the side.

2. Block out the sun at home during the day by closing curtains and blinds. Open the windows when there is a cool breeze. Stay out of the sun during the hottest part of the day. If you do have to go outside, wear a hat and sunscreen, and seek shade.

3. the Philippines enjoys a tropical climate that is for the most part hot and humid year-round, but can be roughly divided into a dry season between November and May, and a wet season between June and October. Although in recent years, due to climate change, summers have been extending into June and July.

Answer:

43.2 moles of carbon dioxide are required and 421g of glucose could be produced

Explanation:

Based on the reaction:

6CO2 + 6H2O → C6H12O6 + 6O2

1 mole of glucose, C6H12O6, requires 6 moles of carbon dioxide. 7.2moles of glucose requires:

7.2mol C6H12O6 * (6mol CO2 / 1mol C6H12O6) =

618g of CO2 -Molar mass: 44.01g/mol- are:

618g * (1mol / 44.01g) = 14.04moles CO2

Moles C6H12O6:

14.04moles CO2 * (1mol C6H12O6 / 6mol CO2) = 2.34moles C6H12O6

Mass glucose -Molar mass: 180.156g/mol-

2.34moles C6H12O6 * (180.156g / mol) =

Answer:

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