CHEMISTRY HIGH SCHOOL

How many moles of C
O
2
COX
2

​
will be produced from
97.0
g
97.0 g97, point, 0, start text, space, g, end text of
C
3
H
8
CX
3

​
HX
8

​
, assuming
O
2
OX
2

​
is available in excess?

Answers

Answer 1
Answer:

Final answer:

Given 97.0 g of propane (C3H8), about 6.6 moles of CO2 will be produced according to the balanced chemical equation for the combustion of propane.

Explanation:

The question asks how many moles of CO2 will be produced from 97.0 g of C3H8, assuming O2 is available in excess.

The balanced chemical equation for the combustion of propane (C3H8) is C3H8 + 5O2 → 3CO2 + 4H2O. This tells us that one mole of propane produces three moles of CO2.

First, we need to find the moles of propane. The molar mass of propane is approximately 44.09 g/mole. So, 97.0 g of propane corresponds to approximately 2.2 moles. Therefore, 2.2 moles of propane produce 2.2 * 3 = 6.6 moles of CO2.

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Does the axis tilt change or stays the same is space ?

Answers

stay the same

Explanation:

Answer:

The axis is tilted in the same direction throughout a year; however, as the Earth orbits the Sun, the hemisphere (half part of earth) tilted away from the Sun will gradually come to be tilted towards the Sun, and vice versa.

Explanation:

hop this helps!!

Why does a reaction slow down with time?

Answers

As a reaction proceeds the concentration of the reactants will get lower. Since reactions occur due to collisions that are in the correct orientation and lower concentrations leads to a lower amount of collisions, lower concentrations result in lower reaction rates. I hope this helps. Let me know if anything is unclear.

The scientific notation 2 x 10-2 has what value?
0.02
0.002
0.2
0.0002

Answers

Answer : The correct option is, 0.02

Explanation :

The scientific notation is a way of the representation of the very small or very large number.

The given scientific notation is, 2* 10^(-2)

That means,

2* 10^(-2)=(2)/(100)=0.02

Hence, the scientific notation of 2* 10^(-2) has 0.02 value.
Since the exponent is negative, you move the decimal (2.0) to the left two spots leaving you with .02

Which mass measurement contains four significant figures?(1) 0.086g (3) 1003g(2) 0.431g (4) 3870g

Answers

Answer: option (3) 1003 g.


Explanation:


1) 0.086 g has two signficant figures, because the zeros to the left of the decimal period and to the right of the decimal period and before the first non zero digit do not count. Those zeros only tell the place value of the other digits. So, only 8 and 6 are significan figures: two.


2) 0.431g has three significant figures: the 0 before the decimal period do not count. Only 4, 3, and 1 are signficant figures: three.


3) 1003 g has four significant figures, because the zeros in between the other digits count. So, 1, 0, 0, and 3 are significant figures.


4) 3870 g has three significant figures, because the 0 after the other 3 digits is only to determine the place value of the first three digit. Only 3, 8, and 7 here are significant figures.

Final answer:

Among the provided options, the mass measurement '1003g' contains four significant figures. In significant figure rules, leading zeros are not counted while zeros between non-zero numbers and zeros that come after a non-zero number, in a whole number representation, are significant.

Explanation:

In the context of mass measurement in chemistry, significant figures are crucial as they represent the precision of a measurement. Among the provided options: 0.086g, 1003g, 0.431g, and 3870g, the mass measurement 1003g contains four significant figures.

To clarify, leading zeros (e.g., 0.086g) are not counted as significant figures. In whole numbers, however, trailing zeros are counted as significant figures if they directly follow a non-zero number (e.g., 1003g). Therefore, the mass measurement '1003g' actually has four significant figures: 1, 0, 0, and 3.

However, the trailing zeros in '3870g' are not considered significant as there's no decimal point specified.

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Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI

Answers

You can compare the strength of the hydrogen bonding by comparing the electronegativities of the other elements. All the four elements, Br, F, Cl and I belong to the same group in the periodic table: group 17 named halogens. Then the kind of bonding they form is similar: polar covalent. You must know the trend of the electronegativities in the periodic table. Electronegativity decrease when you down across a group. Then the electronegativity of F is the higher of the group (indeed, it is the highest of all the 118 elements) . The higher the electronegativity the stronger the attraction that the halogen attracts the electrons and the stronger the hydorgen bonding. Then, the conclusion is that HF has the strongest hydrogen bonding.
The correct answer is HF

Which of the following is physical change a. Corrosion
b. explosion
c. Evaporation
d. rotting of food ***

Answers

rotting food
hope this helps
all of the above corrosion, explosion, evaporation and rotting food all have physical change in different aspects
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