CHEMISTRY HIGH SCHOOL

Which one of the following elements does not exist as a diatomic molecule in nature? (a) hydrogen
(b) nitrogen
(c) fluorine
(d) neon

Answers

Answer 1
Answer: Neon
An easy way to remember the diatomic molecules is HOFBrINCl 
almost sounds like hofbrinkle 
Answer 2
Answer:

Answer:

Neon, it is the answer on chem exam and it doesnt exist as a diatomic molecule

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Outliers existing in a data set will have the greatest impact on __________. A. the mean B. the median C. the mode D. the middle

Answers

Outliers are the ones that are least precise among the data. They may be due to experimental or human errors. In the case of having outlier in the data, its effect is most significant n computing the mean because they are included in the calculation. The median mode and middle do not involve calculation but only the ordination, so they are not affected.

Answer:

Outliers existing in a data set will have the greatest impact on :

            option: A is the correct answer.

               A.  The mean.

Step- by- step explanation:

We know that an outlier is a data value or the data point that stands out of the rest of the data points of the set i.e. it either attains a too high or too low value as compared to other data points.

            Hence, the outlier will effect the mean of the data set.

( Since, when a too low value is present in the set then after removing that value the mean of remaining elements or data points will increase after removing the outlier.

For example if we have data set as:

       1      30   34    39    41    45

Then mean of the set is:

Mean=(1+30+34+39+41+45)/(6)\n\n\nMean=31.667

and on removing 1 from the set we get:

Mean=(30+34+39+41+45)/(5)\n\n\nMean=37.8

Hence, we see that the mean is increased.

Similarly, if there is a data value which is too high then after removing that element the mean of the remaining data points will decrease )

From what class(es) of elements is the following compound made? copper || chloride metal and metalloid
metal and nonmetal
metalloid and nonmetal
two metals

Answers

Answer: The correct answer is metal and non-metal.

Explanation:

Elements are mainly divided into 3 classes in the periodic table.

1.) Metals: The element which lie on the left side of the periodic table are mainly metals. These elements loose electron easily and form positively charged species. These elements are present in the highest proportion in the periodic table.

2.) Non-metals: The elements which lie on the right side of the periodic table are considered as non-metals. These elements gain electrons easily and form negatively charged species.

3.) Metalloids: These lie between metals and non-metals and show the properties of both metals and non-metals.

Copper lie in the period 4 and group 11 of the periodic table and it can easily loose electron and hence, it is considered as a metal.

Chlorine lie in the period 3 and group 17 of the periodic table and it can easily gain electron and hence, considered as a non-metal.

Therefore, the correct answer is metal and non-metal.
Metal and non metal because copper is a metal and chloride is a non metal

Wtite and balence the equation for formation of so3 from so2 and oxygen gases

Answers

2SO3----> 2SO2 + O2 is how you do it

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.

How is energy transferred through the water cycle?



Please help

Answers

Answer:

The water cycle is driven primarily by the energy from the sun.

Before arc welding was developed, a displacement reaction involving aluminum and iron(III) oxide was commonly used to produce molten iron (the thermite process). This reaction was used, for example, to connect sections of iron railroad track. Calculate the mass of molten iron produced when 2.28 kg of aluminum reacts with 17.2 mol of iron(III) oxide.

Answers

Answer: The mass of molten iron formed will be 1.92 kg

Explanation:

We are given:

Moles of iron (III) oxide = 17.2 moles

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     ......(1)

Given mass of aluminium = 2.28 kg = 2280 g     (Conversion factor:  1 kg = 1000 g)

Molar mass of aluminium = 27 g/mol

Putting values in equation 1, we get:

\text{Moles of aluminium}=(2280g)/(27g/mol)=84.44mol

The chemical equation for the reaction of aluminium and iron (III) oxide follows:

2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe

By Stoichiometry of the reaction:

1 mole of iron (III) oxide reacts with 2 moles of aluminium

So, 17.2 moles of iron (III) oxide will react with = (2)/(1)* 17.2=34.4mol of aluminium

As, given amount of aluminium is more than the required amount. So, it is considered as an excess reagent.

Thus, iron (III) oxide is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of iron (III) oxide produces 2 moles of iron

So, 17.2 moles of iron (III) oxide will produce =  (2)/(1)* 17.2=34.4mol of iron

Now, calculating the mass of iron by using equation 1, we get:

Molar mass of iron = 55.8 g/mol

Moles of iron = 34.4 moles

Putting values in equation 1, we get:

34.4mol=\frac{\text{Mass of iron}}{55.8g/mol}\n\n\text{Mass of iron}=(34.4mol* 55.8g/mol)=1919.5g=1.92kg

Hence, the mass of molten iron formed will be 1.92 kg
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