1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sleet_krkn [62]
3 years ago
9

Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. (1.8 x 1

0-2) ÷ (9 x 102) = _____

Chemistry
2 answers:
slamgirl [31]3 years ago
6 0

Answer : The answer is, 0.2\times 10^{-4}

Explanation :

Scientific notation : It is defined as the way or representation of expressing the number that are too big or too small that is written in the decimal form. That means always written in the power of 10 form.

For example : 8000 is written as, 8.0\times 10^3  in this notation, the significant figure is, 1 but 0.8\times 10^4  in this notation, the significant figures are, 2

The given problem are :

\frac{1.8\times 10^{-2}}{9\times 10^2}=0.2\times 10^{-4}

According to the divide and multiplication rules of scientific figures, the final answer is only as precise as the value with the least number of significant figures.

Hence, the answer is, 0.2\times 10^{-4}

Gnesinka [82]3 years ago
3 0

The result of division (1.8 x 10⁻²) ÷ (9 x 10²) is 2.10⁻⁵ (cause the result must have 1 significant number)

<h3><em>Further Explanation</em></h3>

Significant numbers are obtained from measurement results of exact numbers and the last number estimated

This is called significant numbers

The scientific notation can be described as:

a, ... x 10ⁿ

where the power of n is an integer, and the coefficient a is a real number

Rules for significant numbers in general:

  • 1. All non-zero numbers are significant numbers
  • 2. a zero which is located between two non-zero numbers including a significant number
  • 3. all zeros are located in the final row written behind the decimal point of the include significant number
  • 4. zero decimal point is the not significant number
  • 5. In multiplication and division of important numbers, the final results look at the least number of significant numbers.

In the question, it is known that

(1.8 x 10⁻²) ÷ (9 x 10²) has 2(1.8) and 1(9) significant numbers, so the division of both produces 1 significant number

So that we did the significant number then proceed with rank number

  • 1. Division of siginificant numbers

1.8: 9 = 0.2

  • 2. Division of rank numbers

10⁻²: 10² = 10⁻⁴

So the result = 0.2.10⁻⁴

In the form of scientific notation, it becomes: 2.10⁻⁵

The result has one significant number, which is number 2

<h3><em>Learn more</em></h3>

the number of significant figures

brainly.com/question/5222111

the result of multiplying of significant numbers

brainly.com/question/1419180

Compute 4,659 × 104−2.14 × 104.

brainly.com/question/1663489

Keywords: the scientific notation, significant number

You might be interested in
Calculate the freezing point of a solution 1.25 g benzene (C6H6) in 125 g of chloroform (CHCl3).
posledela

Answer:

The freezing point for the solution is -64.09°C

Explanation:

This problem can be solved, by the freezing point depression. This colligative problem shows, that the freezing point of a solution is lower than the freezing point of pure solvent.

ΔT = Kf.  m

ΔT = T° freezing pure solvent - T° freezing solution

Kf = Cryscopic constant, for chloroform is 4.68

T°freezing pure solvent = -63.5°C

m is mol/kg of solvent → molality

Let's determine the moles of benzene

1.25 g / 78 g/mol = 0.0160 mol

Let's convert the mass of solvent to kg

125 g . 1kg / 1000 g = 0.125 kg

m = 0.0160 mol / 0.125 kg → 0.128 m

Let's go to the formula to replace the data

-63.5°C - T° freezing solution = 4.68 °C/m . 0.128 m

T° freezing solution = - (4.68 °C/m . 0.128 m + 63.5°C)

T° freezing solution = - 64.09°C

3 0
3 years ago
Why must there be two chlorine atoms for every one calcium atom
Nady [450]

Answer:

There must be two Chlorine atoms for every one Calcium atom in order to fulfill Chlorine's octet rule and pair Calcium's unpaired electrons.

Explanation:

Calcium has two unpaired electrons in its Lewis dot structure, while Chlorine has one unpaired electron.

<em>So why can't we just make a double bond for </em><em>one</em><em> Chlorine?</em>

Chlorine has seven valence electrons, so once it shares electrons with Calcium, the octet rule is accomplished, and no more pairs can be made.

4 0
3 years ago
Which half-reaction correctly represents oxidation?
Leokris [45]

Answer: Mg\rightarrow Mg^{2+}+2e^- represents oxidation.

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Example: Mg\rightarrow Mg^{2+}+2e^-

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

Example: Mg^{2+}+2e^-\rightarrow Mg

Mg\rightarrow Mg^{2+}+2e^- represents oxidation.

4 0
3 years ago
Fluorine (F) and bromine (Br) are in the same group on the periodic table. How do atoms of these elements compare when they form
stiks02 [169]

Answer:

they both gain one electron

Explanation:

they are both halogens and they each have one unpaired electron so that unpaired electron join together to make them form a bond

5 0
3 years ago
The elements that contain electrons in an F sublevel near the highest occupied energy level are referred to as?
Mrac [35]

inner transmission levels i took the test

3 0
3 years ago
Read 2 more answers
Other questions:
  • Why might a dry atmosphere cause your crystal to fracture and to eventually become a
    12·1 answer
  • Determine the vapor pressure of a solution at 55 °C that contains 34.2 g NaCl in 375 g of water. The vapor pressure of pure wate
    5·1 answer
  • The following chemical equation is not balanced: CaCl2 + AgNO3 AgCl + Ca(NO3)2 When this chemical equation is correctly balanced
    7·2 answers
  • How many atoms are in 4.00 moles of helium?
    6·2 answers
  • Why does an aluminum horseshoe bend but not break when a blacksmith pounds it into shape with a hammer?
    5·1 answer
  • What is the connection between natural capital, natural income, and an environmentally sustainable society? (ENVIRONMENTAL SCIEN
    11·1 answer
  • A gas occupies 65 mL at a temperature of 92.4 °C. What is the volume at 87.6 °C?
    8·1 answer
  • Different between methane and ethane.​
    6·1 answer
  • Why do solids maintain their volume and shape? cause-effect
    9·2 answers
  • In the following equation, ______ is being oxidized and ______ is being reduced.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!