Help me with these questions google won’t tell them for me!!

Answer:

b - 385 j

Explanation:

Answer:

4 i2  + 9 O2 --> 2 i4O9

Explanation:

Answer:

C-Rb20

Explanation:

The chemical formula for Rubidium oxide is Rb20.

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Answer: [tex]CS_2+3Cl_2\rightarrow CCl_4+S_2Cl_2[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.

In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.

The given chemical equation is:

[tex]CS_2+Cl_2\rightarrow CCl_4+S_2Cl_2[/tex]

The balanced chemical equation is:

[tex]CS_2+3Cl_2\rightarrow CCl_4+S_2Cl_2[/tex]

Answer:

blank, 3, blank, blank

Explanation:

Answer: H2O

Explanation: The alcohol family has properties similar to H2O.

Answer:

H2O

Explanation:

Answer:

c

Explanation:

the rest are chemical properties

Answer:

Because graphite has delocalised electrons ,just like metal

Graphite is the allotrope of carbon. Allotropes are chemical compounds of the single element present and arranged in a complex form.

The uses of the graphite are as follows:-

Graphite the is allotropes of the carbon which means it has a free electron in the valence shell. In graphite, there is one free electron which moves from one place to another.

The movement of transferring the electron in the compound can allow the graphite to conduct heat.

Hence, the free electron is the answer.

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Answer:

What is the oxidation half reaction for iron?

The two elements involved, iron and chlorine, each change oxidation state; iron from +2 to +3, chlorine from 0 to -1. There are then effectively two half-reactions occurring. These changes can be represented in formulas by inserting appropriate electrons into each half-reaction: Fe2+ → Fe3+ + e.

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Answer:

it is a reaction whereby one or more reactants of the reaction are changed or replaced .

Answer:

false

Explanation:

the soil contain: organic materials, and inorganic materials

Answer:

methane

Explanation:

Answer:

9.32% de riqueza de Al en la muestra

Explanation:

La reacción de aluminio (Al) con ácido sulfúrico (H₂SO₄) es:

2 Al + 3 H₂SO₄ → Al₂(SO₄)₃ + 3 H₂

Dos moles de aluminio reaccionan con 3 moles de ácido sulfúrico para producir una mol de sulfato de aluminio (Sal).

Las moles de 28g de sulfato de aluminio (Masa molar: 324.15g) son:

28g ₓ (1 mol / 324.15) = 0.0864 moles de Al₂(SO₄)₃

Así, las moles de aluminio que reaccionaron fueron:

0.0864 moles de Al₂(SO₄)₃ ₓ ( 2 moles Al / 1 mol Al₂(SO₄)₃) =

0.1728 moles de Al. En gramos (Masa atómica: 26.98g/mol):

0.1728 moles Al ₓ (26.98g / mol) = 4.66g de aluminio.

Así, la riqueza de la muestra es:

4.66g Al / 50g muestra ₓ100 = 9.32% de riqueza de Al en la muestra

Answer:

The 2s orbital is at a higher energy level.

Explanation:

1s and 2s are the sub-orbitals that are located in an atom. They are nearest to the nucleus and are found on the s sub-orbital. The difference between 1s and 2s is the difference in their level of energy. 1s has low energy as compared to 2s. 1s orbital has the lowest energy because it is located closed to the nucleus. 2s orbital has higher energy than 1s because it's orbit is larger than 1s.

Answer: Boron is the element which has properties of both metals and nonmetals.

Explanation:

Metals are defined as the elements which loose electrons to attain stable electronic configuration. They attain positive charge and form cation. Example: Zinc (Zn), Aluminium (Al) , copper (Cu)

Non-metals are defined as the elements which gain electrons to attain stable electronic configuration. They attain negative charge and form anion. Example: Chlorine (Cl) , Sulphur (S)

Metalloids are defined as the elements which show properties of both metals and non-metals. There are 7 metalloids in the periodic table. They are Boron (B) , Silicon (Si) , Germanium (Ge) , Arsenic (As) ,  Antimony (Sb), Tellurium (Te) and Polonium (Po).

Thus boron is the element which has properties of both metals and nonmetals.

Answer:

The answer is A boron!!!!!!

Explanation:

i took the quiz on ed

Answer:

D. all of the above

Explanation:

Ice made from water is a solid because the atoms or molecules

- vibrate in place

- are unable to move around

- are closely packed and touching

In a solid, the atoms or molecules are unable to move around so they just vibrate in fixed positions and they are closely packed and touching.

Answer:

Chemical reactions happen when two or more molecules interact and the molecules change.

Explanation:

Bonds between atoms are broken and created to form new molecules. That's it.

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Answer:

C)We cannot be sure unless we find out its boiling point.

Explanation:

I will like to clearly state that simply comparing two compounds will not tell us exactly which one will be a liquid, solid or gas at room temperature.

If I want to determine whether an unknown substance will be a liquid at room temperature, I will have to measure its boiling point. If the boiling point is above room temperature, and the melting point is below room temperature, it’s a liquid. If the boiling point of the unknown substance is below room temperature, it is a gas.

This confirms that we cannot conclude on the state of matter in which a compound exists unless we know something about its boiling point, not by inspecting the properties of neighbouring compounds in the same homologous series

We cannot predict from this information provided whether C4H10, butane, will be a liquid at room temperature because We cannot be sure unless we find out its boiling point (option c)

Normally, Butane is a gas at room temperature and pressure. However too, if it is put under pressure, its boiling point rises. At a pressure of 2.13 x 105 Pa, its boiling point goes up to -25 °C which is obviously higher than room temperature. So, by putting butane at a pressure of just over 2 atm, it is a liquid at room temperature.

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Answer: V=67.2 L

Explanation:

For this problem we will need to use the Ideal Gas Law.

Ideal Gas Law: PV=nRT

P=1.00 atm (STP)

V=?

n=3.00 mol

R=0.08206Latm/Kmol

T=273.15 K (STP)

To find V, we would manipulate the equation to V=nRT/P

[tex]V=\frac{(3.00 mol)(0.08206Latm/Kmol)(273.15K)}{1.00 atm}[/tex]

[tex]V=67.244 L[/tex]

With significan figures, our answer is V=67.2 L.

Answer:

hex-

Explanation:

Prefix Prefix meaning Sample word

hex-           6                                  hexapod: having six legs, an insect, for      

                                                                   example.

Answer:

Hex-

Explanation:

Answer:

A

Explanation:

Answer:

Electrical forces can act from a distance

Explanation:

A. Because electrical forces act at a distance, charged objects brought near a neutral object will cause electrons on the neutral object to rearrange their position

Answer and Explanation:

In H2O molecules, due to formation of intermolecular hydrogen bonds, there is molecular association. Large amount of energy is required to break these intermolecular hydrogen bonds. Intermolecular hydrogen bonding is not possible in H2S. Hence, its boiling point is lower and is a gas.

Answer:

73.5%

Explanation:

Step 1:

Data obtained from the question.

Theoretical yield = 0.721Kg

Actual yield = 530g

Percentage yield =..?

Step 2:

Conversion of 0.721Kg to grams. This is illustrated below:

1Kg = 1000g

Therefore, 0.721Kg = 0.721 x 1000 = 721g

Step 3:

Determination of the percentage yield.

The percentage yield can be obtained by using the following formula:

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 530/721 x 100

Percentage yield = 73.5%

Therefore, the percentage yield is 73.5%

Answer:

73.5%

Explanation:

plato

Answer:

80.0 mL

Explanation:

V1/V2 = T1/T2

T1 = 273 -123 = 150K

T2 = 273 +27 = 300 K

40.0 mL/V2 = 150K/300K

V2 = 40.0 mL*300K/150K = 80.0 mL

The volume that is occupied at 27°C, assuming pressure is constant is 80ml.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as

                          PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Initial Volume = 40 ml

Initial temperature = -123°C = 273 - 123 = 150K

Final temperature = 27°C = 273 + 27 = 300K

From Charles' law,

V₁ / T₁ = V₂ / T₂

V₂ = (40 × 300) ÷ 150

= 80 ml

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Answer:

d) burning fossil fuels

Explanation:

We humans burn fossil fuels the most

Explanation:

lpg and oxygen are two gases which are supplied in compressed form in homes and hospitals

Answer:

lpg and oxygen

they are the two gases which are supplied in either a gas form or any other medical forms in homes and hospitals to look after the ill patients or family members

Answer:

Option D.

Explanation:

Isomerism is a phenomenon where by two or more compounds have the same molecular formula but different structural patterns. The compounds involved are called isomers.

Option A has two different compound with two different molecular formula. Hence they are not isomers.

Option B has two different compound with two different molecular formula. Hence they are not isomers

Option C can not be called isomers because Isomerism can not occur in compound having just 1 carbon atom.

Option D has two different compound with the same molecular formula as C3H8O and their structure are different. Hence they areisomers.

Answer:

An acidic substance is any substance with a pH of less than 7, the smaller the number the more acidic it is. ... An acid is a substance that donates hydrogen ions. Because of this, when an acid is dissolved in water, the balance between hydrogen ions and hydroxide ions is shifted.

Explanation: