Atoms of different isotopes of the same element differ in their total number of electrons neutrons protons valence electrons

Answers

Answer 1

Answer: The ans is neutrons. Isotopes of the same element have the same number of protons(and neutrons) but different number of neutrons.

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Which is the best metal to use in an alloy to increase its electrical conductivity?A) Al
B) Cu
C) Fe
D) Sb

Answers

Answer;

-Copper (Cu)

Explanation;

-While all metals can conduct electricity, certain metals are more commonly used due to being highly conductive. The most common example is Copper. It is highly conductive which is why it is has been used in electrical wiring.

-Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points. The free electrons in metals can move through the metal, allowing metals to conduct electricity.

B) CuCopper is the best metal to use in an alloy because it has the highest electrical conductivity rating of all non-precious metals due to the arrangement of its electrons. They are easily excited and can easily carry an electoral charge.

Which answer best explains why scientific models will continue to improve?Weather events will continue to become more deadly
Scientists continue to find new information and better technology.
Society is dissatisfied with the current weather models
Funding for research will continue to be available

Answers

option b. Scientists continue to find new information and better technology.

505 grams of KOH are required to completely react with 4.50 mole of sulfuric acid. How many moles of products are produced?

Answers

Answer : The moles of products $K_2SO_4$ and $H_2O$ are, 4.50 and 9 moles.

Explanation : Given,

Mass of water = 5.2 g

Molar mass of water = 18 g/mole

Molar mass of $O_2$ = 32 g/mole

The balanced chemical reaction will be,

$2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O$

First we have to calculate the moles of KOH.

$\text{Moles of }KOH=\frac{\text{Mass of }KOH}{\text{Molar mass of }KOH}$

$\text{Moles of }KOH=(505g)/(56g/mole)=9.018mole$

Now we have to calculate the limiting and excess reactant.

From the balanced reaction we conclude that

As, 1 mole of $H_2SO_4$ react with 2 mole of $KOH$

So, 4.50 moles of $H_2SO_4$ react with $4.50* 2=9$ moles of $KOH$

From this we conclude that, $KOH$ is an excess reagent because the given moles are greater than the required moles and $H_2SO_4$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of products $K_2SO_4$ and $H_2O$ .

From the balanced chemical reaction, we conclude that

As, 1 moles of $H_2SO_4$ react to give 1 moles of $K_2SO_4$

So, 4.50 moles of $H_2SO_4$ react to give 4.50 moles of $K_2SO_4$

and,

As, 1 moles of $H_2SO_4$ react to give 2 moles of $H_2O$

So, 4.50 moles of $H_2SO_4$ react to give $4.50* 2=9$ moles of $H_2O$

Therefore, the moles of products $K_2SO_4$ and $H_2O$ are, 4.50 and 9 moles.

Based on reactivity, which of the following elements can replace aluminum (Al) in a compound during a single replacement reaction?

Answers

Based on Reactivity, Potassium (K), Sodium (Na), Magnesium (Mg) and Calcium(Ca) all can replace Aluminum in a reaction being that they are all higher than Aluminium (Al) in the Reactivity series.

Which layer of the suns atmosphere appears red during an eclipse

Answers

The part of the Sun that we see during eclipse is the photosphere. The photosphere is scattered by the loose electrons in the corona’s plasma. A total solar eclipse is when the Moon appears to cover the entire solar disc. It lasts no more than 8 minutes.

All of the following can be used to define a base except__. A. a hydronium ion donor in a reaction B. a substance that increases the concentration of hydroxide ions C. an electron pair donor in a reaction D. a substance that is a hydrogen ion acceptor in a reaction

Answers

All of the following can be used to define a base except__.

Answer: Out of all the options presented above the one that cannot be used to define a base is answer choice A) a hydronium ion donor in a reaction. As we already know a base is a compound that is a proton (H¹⁺) acceptor.

I hope it helps, Regards.

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