When a substance heats up, and the particles gain thermal energy and spread apart, what do scientists say about that substance? a) It becomes more dense. b) It undergoes a phase change. c) It expands. d) It contracts.

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During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?1)A solid forms, and there is a change of color. 2)A gas forms, and there is a change of color. 3)A solid forms, and light is emitted. 4)A gas forms, and light is emitted.

What is Neons group and periodic number?

Answers

Its a noble gas. Its group number is 18 period number is 2

Answer:Hello,

Neon is a noble gas. It is located Group 18 and the oxidation number is 10.

I hoped it helped have a nice day!

Neopentyl alcohol, (ch3)3cch2oh, cannot be dehydrated to an alkene without rearrangement. what is the chief product of dehydration?

Answers

Dehydration is removal of water.

In alcohols dehydration is α-β elimination or 1,2 elimination, it means the hydroxyl group will be removed from α-carbon while the hydrogen will be removed from near by carbon.

In case of neopentyl alcohol there is no β hydrogen present on the β carbon [as shown in figure].

The only possible way for it to undergo dehydration is by rearrangement.

The process or mechanism can be understood as:


so the chief product is 2-methylbut-2-ene



Which type of reaction is represented by the generic equation AB + CD mc002-1.jpg AD + CB?combustion

decomposition

single replacement

double replacement

Answers

Answer : Option D) Double replacement

Explanation : Double displacement or replacement reactions are those in which the two reactant molecules exchange the cations and anions between them and give a new product.

So, in this case when the reaction is AB + CD → AD + CB

Here, both the species of reactant compound molecule went replacement with the adjacent cation and anion group and formed a new compound or product. Therefore, this can be called as double replacement reaction.

The type of reaction is represented by the generic equation AB + CD -> AD + CB is double replacement. The rest of the choices do not answer the question above. 

What is the formula of the ion formed when potassium achieves noble-gas electron configuration

Answers

Answer;

K+

Explanation;

-Noble gas configuration is the electron configuration equivalent to noble gases or group 8 elements. According to the octet rule an atom of an element gains or looses electrons to attain noble gases configuration which is the stable configuration, such that an atom has attained maximum number of electrons in the outermost energy level.

-For instance potassium is an alkali metal, consisting of one valence electron in the outermost energy level. For an atom of potassium to attain octet configuration or noble gases configuration it will have to loose one electron, thus forming a positively charged ion of potassium, K+.

potassium is an alkali metal which means that it only needs to get rid of one electron to achieve a noble gas configuration.  Since it only needs to get rid of one electron the ion will be a cation with a charge of +1 which means the symbol will be K⁺.

I hope this helps.  Let me know if anything is unclear.

Find the volume of 20.0 g of benzene

Answers

(d) Density of Benzene: 0.8786 g/cm cubed
(m) Mass: 20.00g
Formula to solve (v) volume of benzene: V=m/d
V=20g / 0.8786g/cm cubed
Answer: Volume of benzene is: 22.8 cm cubed  

Explanation: Well, density is mass divided volume. In this, it is what the volume is. All you need is mass divided by density. Hope this helps!

Final answer:

To calculate the volume of 20.0 g of benzene, use the formula volume = mass/density. Given that the density of benzene is 0.879 g/mL, the volume is approximately 22.75 mL when you divide 20.0 g by 0.879 g/mL.

Explanation:

To find the volume of 20.0 g of benzene, we need to use the density of benzene because density is defined as mass per unit volume (density = mass/volume). The formula to calculate the volume from the mass and density is volume = mass/density.

In this case, we are given:

  • Mass of benzene = 20.0 g
  • Density of benzene = 0.879 g/mL (from the provided information)

To calculate the volume, we divide the mass by the density:

Volume = Mass / Density = 20.0 g / 0.879 g/mL

We can now perform the calculation:

Volume = 20.0 g / 0.879 g/mL ≈ 22.75 mL

Therefore, the volume of 20.0 g of benzene is approximately 22.75 mL.

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Calculate the mass number of an atom that has 92 protons and 108 neutrons

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What element would have 73 protons and 108 Neutrons?

Because there are 73 Protons and that equals the Atomic Number .. what is the element that is 73 as its atomic number? 

Tantalum

Because we know that there are 73 Protons and 108 Neutrons ..we could do this 73+108 = 181

So its name is Tantalum-181

hope this helps.

Final answer:

The mass number of an atom with 92 protons and 108 neutrons is 200.

Explanation:

To calculate the mass number of an atom that has 92 protons and 108 neutrons, you simply add these two numbers together. The mass number of an atom is comprised of the total number of protons and neutrons in its nucleus. So, 92 protons + 108 neutrons = 200. Therefore, the mass number of the atom is 200.

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