CHEMISTRY HIGH SCHOOL

the combustion of propane may be described by the chemical equation, C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g) 

how many grams of O2(g) are needed to completely burn 40.4 g of C3H8(g)?

Answers

Answer 1
Answer: \nu_(C_3H_8)=(40.4)/(\mu_(C_3H_8))=
=(40.4)/(3A_C+8A_H)=(40.4)/(44)=
=(9)/(10)=0.9mol
1mol\ C_3H_8...5\ mol\ O_2 \n 0.9mol\ C_3H_8...x\ mol\ O_2
x=(0.9*5)/(1)=4.5mol\ O_2
m=\mu_(O_2)*x=2*A_O*4.5=9*8=72g\ O_2

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What is the temperature increase of 6.4 kg of water when it is heated by a 7.7

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Which physical method can separate a mixture of steel ball bearings and marbles ?a. boiling
b. evaporation
c. filtration
d.sorting

Answers

SORTING METHOD can easily be used to separate a mixture of steel ball bearing and marbles. This separation method is suitable because the two substances that are mixed together have big sizes, so it is easy to separate the two by hand picking the particles. Sorting method is usually used as a separation technique when the size of the mixture is big and the mixed substances are in the same state.

Answer:

D. Sorting

Explanation:

Just tested

A period is a horizontal row on the periodic table.
a. True
b. False

Answers

It is True because in the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families.

The atomic weight of an unknown element, in atomic units (amu), is approximately 20% less than that of calcium, the atomic weight of calcium is 40 amu. Which of the following best approximates the atomic weight, in amu, of the unknown element? (a) 8 (b) 20 (c) 32 (d) 48

Answers

a) 8

40*20%

=40*20/100

=800/100

=8

Final answer:

The atomic weight of the unknown element, which is approximately 20% less than calcium (40 amu), is estimated to be 32 amu.

Explanation:

The atomic weight of an unknown element is said to be approximately 20% less than that of calcium, which has an atomic weight of 40 atomic mass units (amu). To calculate the approximate atomic weight of the unknown element, take 20% of 40 (which is 8) and subtract it from 40. The result is 32 amu (40 - 8 = 32), so the correct answer is (c) 32.

Learn more about Atomic Weight here:

brainly.com/question/36410206

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Identify which one of these are exact numbers. (Can be more than 1) a. 2.54 cm ( the number of centimeters in exactly 1 in)
b. 56.00 s ( a time measured by a stopwatch)
c. 4 choices ( the number of choices in this list)
d. 3 lbs ( the weight of an object measured on a scale )

Answers

Answer: a. 2.54 cm ( the number of centimeters in exactly 1 in) and c. 4 choices ( the number of choices in this list)


Justification:


1) a. 2.54 cm ( the number of centimeters in exactly 1 in)


Although the exact length of one inch has varied in the past, currently the inch is defined as exactly 2.54 cm, so this is an exact number.



b. 56.00 s ( a time measured by a stopwatch)


The time measured by a stopwatch is not an exact number. The number is limited by the precision of the instrument (the stopwatch) and it migh have been 56.004 instead of 56.00, and the stopwatch cannot shoe that. So, this is not an exact number.


c. 4 choices ( the number of choices in this list)


This is, indeed an exact number. It is 4, not 4.1, nor 3.9, nor any other number.


d. 3 lbs ( the weight of an object measured on a scale )


As reasoned with the stopwatch, this measure, 3 lbs, is subject to the precision of the scale. It is not an exact number. It could be other number close to 3: 2.99 for example.

These are exact numbers: c. 4 choices ( the number of choices in this list)  and d. 3 lbs ( the weight of an object measured on a scale )

Further explanation

The exact number is a value that is known with complete certainty. Examples are counted numbers of objects or certain unit conversions such as exactly 3 feet in 1 yard. Another example is, a dozen is defined as 12 objects, and a pound is defined as 16 ounces.

Fraction an exact number is a fraction takes two integers and places them in a ratio, for example 3/4 or 10/15. A decimal can express the same numerical quantity, but it does so with a single number (like 0.75 or 0.66). So, the fraction makes the relationship among numbers clear in the way it is written.

While a decimal can express the same numerical quantity, but it does so with a single number (like 0.75 or 0.66).

a. 2.54 cm ( the number of centimeters in exactly 1 in) is decimal

b. 56.00 s ( a time measured by a stopwatch)  is not exact numbers

c. 4 choices ( the number of choices in this list)  is exact numbers

d. 3 lbs ( the weight of an object measured on a scale ) is exact numbers

Learn more

  1. Learn more about exact number brainly.com/question/1847531

Answer details

Grade:  9

Subject:  chemistry

Chapter:  exact number

Keywords: exact number

What is the correct electron configuration for carbon?a. 1s22s22p2
b. 1s22s22p4
c. 1s22s22p5
d. 1s22s22p63s23p2

Answers

It is A; [He] 2s² 2p² is another way to put it

Your answer would be A.
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