do the relative proportions of elements in a given compound vary from sample to sample? please explain.

Answers

Answer 1

Answer:

Answer:

No, because it is an intensive quantity.

Explanation:

According to IUPAC, an intensive quantity is one whose magnitude is independent of the size of the system/sample, on the other hand an extensive quantity is one whose magnitude is additive for subsystems.

Exemples of intensive quantities: temperature, density, concentration.

Exemples of extensive quantities: mass, volume, energy.

Answer 2

Answer: No, every water molecule in the universe is two parts hydrogen and one part oxygen. It doesn't matter where you collect it or how large or small the quantity is. They are all the same.

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Reactant - productIf there are 4 grams of reactant, how many grams of product are produced by the chemical reaction?
A)
O grams
2 grams
4 grams
8 grams

Answers

There should be 4 grams of product produced. The amount products should always equal the amount of reactants :)

State of an atom with same number of proton and electrons

Answers

Most elements tend to have the same number of electrons and protons. This gives the element a neutral charge, aka no charge at all.

Here is an example:- Flourine
7 electrons and 7 protons

I need help with Number 63

Answers

Isotopes are variants of an element which have differing number of neutrons. So, yes, because all of them have the same atomic number, meaning they are all Mg, however they all have differing atomic masses meaning different number of neutrons.

If 112 g of iron (Fe) combines with 24 g of oxygen (o2) how much iron oxide is formed

Answers

There are three different oxides of iron: FeO, Fe2O3 (hematite), and Fe3O4 (magnetite). Assuming that the iron oxide formed in this problem is Fe2O3, which is the most common form of iron oxide, the calculations are as follows:

Balanced chemical equation:
4Fe + 3O2 --> 2Fe2O3
i 2 0.75 0
c 1 0.75 0.5
e 1 0 0.5

Moles Fe = 112g /55.845 = 2
Moles O2 = 24/32 = 0.75

The reaction, with an excess of 1 mol Fe, produced 0.5 moles or 0.5 moles(159.69g/mol) = 79.845 grams of Fe2O3.

An easy way to understand:

136 g Fe2O3

So I am in science class and I have a quiz tomorrow and I forgot what classifying mean

Answers

Classifying is, in a nutshell, when you describe what something is. Classification of minerals, for example. If there is a white rock with black flecks, the classification would be Granite.

its describes the class that a head noun belongs to and characterized by not having a comparative or superlative.

This runner completed a 100 meter race with a time of 13.75 seconds. what was her average speed

Answers

Taking into account the definition of speed, you get that the average speed of the runner is 7.27 $(m)/(s)$ .

It is necessary to know that speed is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it.

In other words, speed can be defined as the amount of space traveled per unit of time with which a body moves and can be calculated using the expression:

$Speed= (distance traveled)/(time)$

In this case:

distance traveled= 100 meters
time= 13.75 seconds

Replacing these values in the speed definition:

$Speed= (100 m)/(13.75 s)$

Solving:

Speed= 7.27 $(m)/(s)$

In summary, the average speed of the runner is 7.27 $(m)/(s)$ .

Learn more about average speed:

Answer: 7.27 m/s

Explanation: The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval.

Distance traveled= 100 m

Time taken = 13.75 s

Average speed= $\frac{\text {distance traveled}}{\text {Time taken}}$

Average speed= $(100m)/(13.75s)=7.27m/s$

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