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3 years ago

Expressed to the correct number of significant figures, what is the correct sum of (3.04g + 4.134g + 6.1g)?

Chemistry

1 answer:

Lera25 [3.4K]3 years ago

4 0

Answer:

13.3g

Explanation:

3.04g + 4.134g + 6.1g = 13.274g

=13.3g

When expressing the correct number of significant figures in addition, you go to the last common decimal place. In this case that is 0.1 because all the numbers have this decimal place.

This is because your measurement can only be as precise as the least precise measurement. The more decimal places in the measurement, the more precise the measurement.

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List at least three scientific disciplines related to chemistry mentioned or alluded to in the article. The Ozone Hole

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Answer: biology, climate Science, astronomy etc.

Explanation:

The scientific disciplines that are related to chemistry mentioned or alluded to in the article are:

• Biology: Biology is a natural science which studies living organisms, and this include their molecular interactions, evolution, physical structure, and chemical processes.

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• Climate science: Climate science is also referred to as climatology and it's the scientific study of climate.

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Answer:

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a sample of double-stranded dna contains 42% cytosine. approximately what percent of the nucleotides in this sample will be thym

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3 years ago

This diagram shows the forces acting on a car. The center dot represents the car, and the arrows represent the forces acting on

Mariulka [41]

Answer : The correct option is B- Towards the left.

Solution : Given,

Force on car in upward direction, $F_1$ = 6000 N

Force on car in downward direction, $F_2$ = 6000 N

Force on car in right direction, $F_3$ = 5000 N

Force on car in left direction, $F_4$ = 6000 N

Force : Force is equal to the mass multiplied by the acceleration. The force is directly proportional to the acceleration.

Formula : F = m × a

where, F is force, m is mass and a is acceleration.

From the given diagram we conclude that the $F_1$ and $F_2$ are in opposite direction and the force acting on car are same. So, their net force is zero.

And in case of $F_3$ and $F_4$ , the net force will not be zero because force acting on car are different. The car will accelerate towards left direction because $F_4$ is higher than the $F_3$ .

So, the car will accelerate towards left direction.

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3 years ago

The elements cu, o, la, y, ba, tl, and bi are all found in high-temperature ceramic superconductors. write the expected electron

timama [110]

Part 1)
Cu- [Ar] 3d¹⁰4s¹ atomic number: 29

O- [He] 2s2 2p4 atomic number:8

La- [Xe] 5d¹ 6s² atomic number:57

Y- [Kr] 4d¹5s² atomic number:39

Ba- [Xe] 6s² atomic number:56

Tl- [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹ atomic number:81

Bi- [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³ atomic number:83

Part 2)
You are able to this by consulting the periodic table and following this steps:
-Find your atom's atomic number;
-Determine the charge of the atom (these were all uncharged)
-Memorize the order of orbitals (s, d, p, d.. and how many electrons they can fit)
-Fill in the orbitals according to the number of electrons in the atom
- for long electron configurations, abbreviate with the noble gases

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3 years ago