anybody know the answer

Answer:

C8H18

Explanation:

The end carbons have 3 hydrogen atoms each and the ones in the middle have 1 hydrogen atom each which gives. (3 x 5) + (1 x 3) = 18 hydrogen atoms

Answer:

A. 2,3-dimethylpentane

Explanation:

edge 2022

Hydrocarbons are the simplest compound containing carbon and hydrogen in their molecular structure. 2, 3 dimethyl pentane is correct.

Hydrocarbons are the simplest compound containing carbon and hydrogen in their molecular structure. There are four types of hydrocarbon as follows

Alkanes, alkenes, alkynes and aromatic hydrocarbons. Alkane contai carbon carbon single bond in their structure .Alkene containing carbon carbon double bond in their structure while alkynes contain carbon carbon triple bond in their structure.

Aromatic hydrocarbon contain benzene ring in their structure. Benzene is the example of aromatic hydrocarbon. Aromatic hydrocarbons are used as paint removal and are also used as a solvents.

Thus, 2, 3 dimethyl pentane is correct . It is a hydrocarbon containing carbon and hydrogen in their structure.

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According to the forces of attraction, to  “see” the spaces in matter, add one cup of alcohol.The total volume is less than two cups, since alcohol has a lot of spaces   between molecules, where water molecules can fill.

Forces of attraction  is a force by 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 gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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

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Answer:

0.55

Explanation:

When multiplying values, the number of significant figures in the answer should be the same as the number with the lowest sig figs in the problem which in this case is 2 sig figs (0.17)

3.22 * 0.17 = .5474

Rounded to 2 sig figs = 0.55

Answer:

The theory of Biological Evolution makes two very bold claims about living creatures: First: All living things on earth are related. They evolved from a common ancestor. Second: The evolution of living things is powered by natural processes. Things which can be studied and understood

Explanation:

Answer:

boiling have an effect while freezing so not

Answer:

See explanation below

Explanation:

In this case, you just need to apply the following expression:

Pc = Patm + h + d1/d2

Where:

Pc: Pressure of container

Patm: Atmospherical pressure

h: height of the arm of manometer

d1: density of gas

d2: density of mercury

You are not providing the density of the gas which is filled the container, so, let's assume we are filling this with hexane (d = 0.65 g/mL)

We have all in mm Hg so we just need to apply the above expression:

Pc = 757.1 + 203.3 * (0.65/13.546)

Pc = 757.1 + 9.7553

Pc = 766.8553 mmHg

Answer:

i think its B

Explanation:

When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules. This “chain reaction” movement, called sound waves, keeps going until the molecules run out of energy

The new temperature of the balloon if the volume is decreased to the given amount is 338.5K.

Charles's law states  that the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

Given the data in the question;

Final Temperature; [tex]T_2 = \ ?[/tex]

To determine the new temperature as the volume is decrease, we substitute our given values into the expression above.

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}\\\\V_1T_2 = V_2T_1\\\\261L * T_2 = 176L * 502K\\\\261L * T_2 = 88352L.K\\\\T_2 = \frac{88352L.K}{261L}\\ \\T_2 = 338.5K[/tex]

Therefore, the new temperature of the balloon if the volume is decreased to the given amount is 338.5K.

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Answer:

15 amu.

Explanation:

I looked it up on google.

Taking into account the reaction stoichiometry, 5 moles of CO₂ can be formed from 1.25 mol butane and excess oxygen.

In first place, the balanced reaction is:

2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 2 moles of C₄H₁₀ form 8 moles of CO₂, 1.25 moles of C₄H₁₀ form how many moles of CO₂?

[tex]moles of CO_{2} =\frac{1.25 moles of C_{4} H_{10}x8 moles of CO_{2}}{2 moles of C_{4} H_{10}}[/tex]

moles of CO₂= 5 moles

Then, 5 moles of CO₂ can be formed from 1.25 mol butane and excess oxygen.

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Answer:

An oxidizing agent is a reactant that gains electrons and that is reduced. A reducing agent is a substance that causes the reduction of another substance, meaning that the reactant is losing electrons therefore it is oxidized.

Explanation:

an explanation of why particular events happen in the natural world

Explanation:

yup you are right. The answer is 2,3- Dimethyl butane

Answer:

0.028%

Explanation:

From the question given above, the following data were obtained:

Accepted value = 4.6026 g

Measured value = 4.6013 g.

Percentage error =..?

Thus, we can obtain the percentage error in the student's reading as follow:

Percentage error = |measured value – accepted value|/accepted value × 100

Percentage error = |4.6013 – 4.6026| / 4.6026 × 100

Percentage error = 0.0013 / 4.6026 × 100

Percentage error = 0.13/4.6026

Percentage error = 0.028%

Therefore, the percentage error in the student's reading is 0.028%

MgCl₂ & PbSO₄ is the correct product for the given double replacement reaction.

In the double displacement reaction displacement of two substrate will take place among two reactants and formation of products takes place.

In the question, PbCl₂ reacts with MgSO₄ and displacement between the cations takes place and formation of  MgCl₂ and insoluble precipitate PbSO₄ is formed.

Given reaction is represented as:

PbCl₂ + MgSO₄ → MgCl₂ + PbSO₄

According to the activity series, reactivity of Magnesium is more as compared to the lead atom. So lead is displaced by the magnesium atom and form the above given products.

Hence, option (3) is correct i.e. MgCl₂ & PbSO₄.

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Answer:

1st Question: C

2nd Question: A

Explanation:

bc i said so

Answer:

explanation

Explanation:

Magnesium-

a. Solid

b. Metal

c. Natural

d. Mg

e. Alkaline earth metals

Ill answer the rest if you can mark brainliest

Answer:

4. The question needs to focus more on a relationship instead of just numbers.

Explanation:

One of the characteristic of a good research questions that the answer to that question should be able to be used to make a certain decision. Without this, the question would be considered as useless.

The answer to the question "How many alligators live in the Everglades National Park?"  will not provide you with any useful information. Only non-useful fact. We need to make a little adjustment to make the answer becomes useful.

For example,  Let's say that we alter the question to;

"How littering contribute to the number of Alligators that live in the Everglades National Park?'

The answer to that question will provide us with something that we can use to make a decision. Let's say we find out that littering lead to decreasing number of alligators. We can use this data to convince the legislators to increase the budget to clean up the national park.

Explanation:

What is the best method for separating food dyes

Answer:

Number of valence electrons = Group number of the element on the periodic table.

Explanation:

Hope that helps ^^

Take the given weight (28.2 g) and divide it by the atomic weight of sodium.

The atomic mass can be found under the element symbol on the periodic table. The atomic mass for sodium is 22.98 g.

28.2/22.98 = 1.23 moles

Therefore, there are 1.23 moles in sodium.

Based on the data provided, the electric circuit is completed when the key is closed.

An electric circuit is a complete path through which electric current flows

An electric circuit can either be:

An electric circuit consists of :

Therefore, an electric circuit is completed when all the components are connected and the key closed.

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Answer:

Explanation: HAVE A GREAT DAY EVERYONE <3

Answer:

it's 12.10

Explanation:

pH is the potential of hydrogen ions. pOH is the potential of hydroxide ions. The pOH of this solution is 12.10.

pH is the potential of hydrogen ions. pOH is the potential of hydroxide ions.

It is a scale used to determine the solution's hydrogen ion ( H⁺ ) concentration. It is a scale used to determine the solution's hydroxide ion ( OH⁻ ) concentration.

The difference between the two is that [OH-] represents the concentration of [OH-] or the molarity of OH-. It basically represents the concentration of OH- that is produced when a strong base reacts with water for example. pOH is a value that represents the basicity of a solution.

pH + pOH = 14

1.90 + pOH =14

pOH = 14 - 1.90

pOH = 12.10

Thus, the pOH of this solution is 12.10.

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Crystallisation

(used to separate solids from a solution)

Hope this helps!

Answer:

I think its 32 electrons

Explanation:

im so sorry if im wrong!

Answer:

32 electrons :)

Explanation:

Both relative and absolute ages of te rock are important because, scientists want to learn about the age of rocks.

The rock is part of the solid part of the earth. rocks are studied by geologists in order to determine the actual age of the rock. The age of a rock can tell us a lot about the rock.

We must know that rocks tell something about the earth hence scientists want to learn about the age of rocks.

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72.06 grams is the mass of produced H₂O in the given reaction.

Mass of any substance can be calculated by using moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

NH₄NO₃ → N₂O + 2H₂O

From the stoichiometry of the reaction it is clear that:

1 mole of NH₄NO₃ = produce 2 mole of H₂O

Given mass of NH₄NO₃ = 160.1 g

Molar mass of NH₄NO₃ = 80.03 g/mole

Mole of NH₄NO₃ = 160.1 g / 80.03 g/mole = 2 moles

2 moles of NH₄NO₃ = produce 2 × 2 = 4 moles of H₂O

Molar mass of H₂O = 18.01 g/mol

So, required mass of H₂O will be calculated as:

W = 4mol × 18.01 g/mol = 72.06 grams

Hence, 72.06 grams is the mass of H₂O.

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