The modern periodic table arrangement is a result of all of the following except many scientists who contributed individual knowledge. total rejection of the early versions for modern ideas. much scientific reexamination and argumentation of ideas. periodic repetition of the chemical and physical properties of the elements.

The IUPAC name for the compound CH2=C(CH2CH3)2 is 2,3-diethylbut-1-ene, with the double bond starting at the first carbon of the four-carbon main chain.

The student is asking for the IUPAC name of the chemical compound with the molecular formula CH2=C(CH2CH3)2. This compound is an alkene with two ethyl groups attached to the carbon-carbon double bond. The longest carbon chain that includes the double bond has four carbon atoms. Therefore, the base name is butene. Since there are two identical substituents (ethyl groups), the correct IUPAC name is 2,3-diethylbut-1-ene. In naming the compound, the ethyl groups are listed in alphabetical order and the number 1 indicates the position of the double bond.

Answer:

Models make concepts more tangible. They also make it possible to notice patterns, develop or revise representations, and predict or explain events or relationships.

Explanation:

Trust me it's the answer okay

Final answer:

The sparks from a sparkler and tiny droplets of boiling water both have high thermal energy, transferring this energy to the skin upon contact, causing a burn. A static electricity spark from a doorknob is too brief to harm you. Steam burns are worse than boiling water because of the release of latent heat.

Explanation:

When a sparkler comes into contact with your skin, the hot sparks cause a sensation similar to tiny droplets of boiling water hitting your skin. Both the sparks and the boiling water droplets have a high amount of thermal energy. When they come into contact with your skin, they transfer some of this energy to your skin cells, causing a burn. The transfer of energy in both cases is rapid and occurs over a very small area of contact, leading to a high concentration of energy which can be quite painful.

In the case of a static electricity spark from a doorknob, which can carry a few hundred watts of power, the reason you're not injured is that the spark is very brief. It doesn't last long enough to transfer a significant amount of energy to cause harm. The situation is unlike with a sustained contact with something hot, where energy transfer is more prolonged.

Similarly, when steam condenses on your skin, it releases latent heat, which causes a burn. The latent heat is the energy that was used to break the hydrogen bonds when turning water into steam. When steam condenses back to water on your skin, it releases this energy, causing a more severe burn than boiling water would at the same temperature.

Answer: C. Methane

Explanation:

Answer:

Magma, Volcano, Lava

Explanation:

During the time of convergence of two plates, the subduction zone is created   due to the sinking of the heavier plate below the lighter one. The long, narrow depression, commonly known as trench forms above this zone of subduction.

As the heavier plate goes down, it melts and mixes with the magma. This magma then rises upward due to the force exerted by the large convection currents, which eventually reaches the earth's surface towards the over-riding plate, giving rise to the formation of volcanoes.

When the uplifting of magma is large and rapid, then it erupts on the surface, and undergoes solidification, forming lava.

Thus, the magma reaches the surface of the earth through the formation of volcano and solidifies as lava.

Isotope  is defined as atom of same element with same atomic number but different mass number.

Here, atomic number for C-14 and C-12  is 6 but mass number is 14 and 12 respectively.

Atomic number is equal to number of protons and electrons in an atom and mass number is equal to sum of number of protons and neutrons in nucleus of an atom.

[tex]A=n_{p}+n_{n}[/tex]

Since, both have same atomic number, the number of protons will be 6 for both but they have different number of neutrons.

Number of neutrons in C-12:

[tex]n_{n}=12-n_{p}=12-6=6[/tex]

Number of neutrons in C-14:

[tex]n_{n}=14-n_{p}=14-6=8[/tex]

The number of neutrons in C-12 is 6 and that in C-14 is 8. Therefore, isotope C-14 differ from the stable C-12 in number of neutrons.

[tex]\left[\begin{array}{cccc}&Volume(L)&Pressure(atm)&Temperature(K)\\Methane&2.8&1.65&298\\Oxygen&35&1.25&304\end{array}\right][/tex]

note: K = C° + 273 (Temperature conversion, Celsius to Kelvin)

note:  [tex]Ideal \ Gas \ Law: \ PV=nRT \ \ \ (R = 0.082 \ \frac{L \times atm }{K \times mol} )[/tex]

Formula to find moles is:  [tex]n=\frac{PV}{RT}[/tex]

[tex]\space \\CH_{4} \ : \ n = \frac{1.65 \times 2.8}{298 \times 0.082} = 0.19\ mol \ (limiting \ reactant)[/tex]

[tex]O_{2} \ : \ n = \frac{1.25 \times 35}{304 \times 0.082} = 1.75\ mol \ (2 \times 0.19 = 0.38 \ mol \ is \ enough)[/tex]

note: moles of CO₂ is the same as of CH₄, as can be seen from the chemical equation above, which is 0.19 mol.

[tex]\left[\begin{array}{ccccc}&Volume(L)&Pressure(atm)&Temperature(K)&Moles(mol)\\CO_{2} &?&2.5&398&0.19\end{array}\right][/tex]

Formula to find Volume is:  [tex]V=\frac{nRT}{P}[/tex]

[tex]CO_{2} \ : \ V = \frac{0.19 \times 0.082 \times 398}{2.5} = 2.48 \ L[/tex]

Answer:

The correct answer is "A consumer is obtaining carbon by eating carbon-based molecules stored in a producer".

Explanation:

The animal is consuming the carbon present in the molecules stored in the grass. Plants process the carbon present in the soil along with other minerals. The animal, when it feeds on these plants, is consuming the carbon they obtained from the soil. Grasslands are defined largely by their use for grazing, which includes between 10 and 30 percent of soil carbon worldwide.

Have a nice day!

Answer:

C

Explanation:

it was right on (edge nuity)

Answer: The mass of sodium hydroxide is 10 grams.

Explanation:

To calculate the mass of a substance, we use the equation to calculate the number of moles, we get:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

We are given:

Moles of sodium hydroxide = 0.25 mol

Molar mass of sodium hydroxide = 40 g/mol

Putting values in above equation, we get:

[tex]0.25=\frac{\text{Mass of sodium hydroxide}}{40g/mol}\\\\\text{Mass of sodium hydroxide}=10g[/tex]

Hence, the mass of sodium hydroxide is 10 grams.

A creep is a slow downhill movement of weathered rock material.

A landslide is a sudden movement of rock and soil down a slope.

Basically, creeps are slower than landslides.

Mass is never lost or gained in chemical reactions. So we can say that mass is always conserved. In other words, the total mass of products at the end of the reaction is equal to the total mass of the reactants at the beginning.

This fact allows you to work out the mass of one substance in a reaction if the masses of the other substances are known. 

Answer:

d

Explanation:

just did it

From the results, it is clear that, the growth of the koi fish is depending on the environment in which it grows. This include, the size of pond, food available, water quality, presence of predators etc. Hence, option D is correct.

The condition of the water in which fish are grown directly affects their health and eventual growth. In general, physical, chemical/biochemical, or a combination of these components can be used to categories factors impacting fish growth and productivity in freshwater aquatic systems.

Temperature and suspended and settleable particles concentrations are significant physical water characteristics for the development and growth of fish; crucial chemical water characteristics include pH, alkalinity, hardness, and metal concentrations.

The adequate size of pond let the fish free to move more and make it more energetic with the surroundings. Hence, the growth of koi fish is affected by the environment of the fish.

Find more on koi fish:

https://brainly.com/question/28895961

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Answer:

c- thymol blue

Explanation:

study island

According to the textbook, the indicator that should Andrea use is thymol blue. Thus, the correct option for this question is C.

Strong acid may be defined as a type of acid that is completely dissociated or ionized in an aqueous solution. It is a type of chemical species that typically have the ability to lose a proton, H+. Examples of strong acids include sulphuric acid, hydrochloric acid, nitric acid, etc.

Acids range the pH lower than 7. While exactly 7 is a neutral compound. In the experiment, Andrea was required to know when a strong acid is present, so she utilizes an indicator. For this, she used the indicator that has the pH of strong acid.

Among the options given above, the indicator thymol blue demonstrates the same qualities and characteristics.

Therefore, the indicator that should Andrea use is thymol blue. Thus, the correct option for this question is C.

To learn more about Strong acids, refer to the link:

https://brainly.com/question/28349000

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Answer:

did u get it

Explanation:

Answer:

In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom. ... In a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column

Explanation:

I hope this helps

Final answer:

The Periodic Table is arranged by their properties, with elements grouped according to similar chemical and physical characteristics. Silicon is represented by the symbol Si, and all atoms of an element are alike. Metals are shiny and good conductors, while nonmetals are dull and poor conductors.

Explanation:

1. Elements in the Periodic Table are arranged by their properties, therefore, the correct answer is A. by their properties.

2. The correct symbol for the element silicon is C. Si.

3. All atoms of an element are alike, meaning the correct answer is C. alike.

4. Elements that are usually shiny and good conductors of heat and electricity are known as B. metals.

5. The most recent model of an atom is the D. Electron Cloud model.

6. Elements that are usually dull, brittle, and do not conduct electricity are D. nonmetals.

7. Elements join together to form A. compounds.

8. For the picture that best shows an atom, since images can't be displayed here, one should typically look for a depiction that includes a nucleus surrounded by electrons, which represents the Electron Cloud model.

9. In order for a chemical reaction to take place, a certain amount of D. energy must be present.

10. Enzymes are A. catalysts in the body that speed up chemical reactions.

The correct calculation yields 0.724 moles of Ba(OH)₂, not 2.93, indicating a mistake in the given answer's stoichiometry interpretation.

To react completely with 117 g of hydrogen bromide (HBr), 2.93 moles of barium hydroxide (Ba(OH)2) would be required.

First, we need to write the balanced chemical equation for the reaction between barium hydroxide and hydrogen bromide:

[tex]\[ \text{Ba(OH)}_2 + 2\text{HBr} \rightarrow \text{BaBr}_2 + 2\text{H}_2\text{O} \][/tex]

From the balanced equation, we can see that 1 mole of barium hydroxide reacts with 2 moles of hydrogen bromide.

Next, we need to calculate the number of moles of hydrogen bromide (HBr) present in 117 g. The molar mass of HBr is 80.91 g/mol (1.008 g/mol for H and 79.90 g/mol for Br).

[tex]\[ \text{moles of HBr} = \frac{\text{mass of HBr}}{\text{molar mass of HBr}} \][/tex]

[tex]\[ \text{moles of HBr} = \frac{117 \text{ g}}{80.91 \text{ g/mol}} \][/tex]

[tex]\[ \text{moles of HBr} =1.448 \text{ moles} \][/tex]

Now, using the stoichiometry of the balanced equation, we can find the moles of barium hydroxide required:

[tex]\[ \text{moles of Ba(OH)}_2 = \frac{1}{2} \times \text{moles of HBr} \][/tex]

[tex]\[ \text{moles of Ba(OH)}_2 = \frac{1}{2} \times 1.448 \text{ moles} \][/tex]

[tex]\[ \text{moles of Ba(OH)}_2 =0.724 \text{ moles} \][/tex]

However, the given answer is 2.93 moles, which suggests that there might be a mistake in the calculation. Let's re-evaluate the moles of HBr:

[tex]\[ \text{moles of HBr} = \frac{117 \text{ g}}{80.91 \text{ g/mol}} \][/tex]

[tex]\[ \text{moles of HBr} =1.448 \text{ moles} \][/tex]

 Since the stoichiometry of the reaction is 1 mole of Ba(OH)2 to 2 moles of HBr, the correct calculation for the moles of Ba(OH)2 required should be:

[tex]\[ \text{moles of Ba(OH)}_2 = 1.448 \text{ moles HBr} \times \frac{1 \text{ mole Ba(OH)}_2}{2 \text{ moles HBr}} \][/tex]

[tex]\[ \text{moles of Ba(OH)}_2 = 0.724 \text{ moles} \][/tex]

It appears that the provided answer of 2.93 moles of Ba(OH)₂ is incorrect based on the stoichiometry of the reaction and the calculations performed. The correct answer should be 0.724 moles of Ba(OH)₂. There seems to be a discrepancy between the provided answer and the calculated result. The correct answer, based on the calculations, is 0.724 moles of barium hydroxide, not 2.93 moles.

Hello there!

Sometimes it is good to go on a diet for us. Other times, (we may not realize it), but it can be risky for our health and bodies. While getting more vitamins can be healthy and good for us, too much of the same vitamins in our body can be unhealthy, and even cause scary side effects. Do not be misled, the title “vitamin”, does not mean “use generously”. Just as we are to limit our eating of unhealthy foods, we need to limit our use of just vitamins as well.

For example, while vitamin A can be beneficial for our bodies in some ways, too much of it can liver damage, headaches, reduce bone strength, and in very serious cases even birth defects to children, or one conceiving a child. Yes, we need just enough to keep us healthy an active. There can only be so many problems with the human body, and using too many dietary supplements should not be one of them.

Hope this helps!

~DL