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
nordsb [41]
3 years ago
9

Use your calculator to determine the answer to the following calculation: 1.0×10−154.2×10−7

Chemistry
2 answers:
Luba_88 [7]3 years ago
5 0

Results of operations count: -1539 or 2.4 .10⁻⁹ (two significant figure)

<h3>Further explanation</h3>

Calculating operations in mathematics consist of the operations of addition, subtraction, division, and multiplication.

In one arithmetic operation can have all four operations above, which are called mixed arithmetic operations

We must know the order in which the arithmetic operations must be done first.

The order of the process follows the PEMDAS system, namely: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.

So:

  • 1. If there are parentheses, then do it first
  • 2. multiplication and division operations have the same degree, so it is done from the left first
  • 3. operations of addition and subtraction calculations also have the same degree so that it can be done from the left first

In the following calculation 1.0 × 10−154.2 × 10−7

1. we prioritize the multiplication operation from the left then after that the subtraction operation, we get:

= 10 - 1542 - 7

= - 1539

2. If it is considered that the problem is a division of rank numbers(scientific notation)

1.0 × 10⁻¹⁵ : 4.2 × 10⁻⁷

then we use principles in rank operations

General properties of numbers:

• 1. aᵇ x aⁿ = aᵇ⁺ⁿ

• 2. aᵇ: aⁿ = aᵇ⁻ⁿ, a ≠ 0

• 3. a⁻ᵇ = 1 / aᵇ, a ≠ 0

• 4. (aᵇ) ⁿ = aᵇⁿ

• 5.(\frac {a}{b}) ^n~=~(\frac {a^n}{b^n}), b\neq 0

aⁿ: rank number

Then the solution:

We divide the principal numbers first and then the rank numbers, then we multiply the results of the two operations

1. division of principal numbers

1: 4.2 = 0.238

2. division of rank numbers

10⁻¹⁵: 10⁻⁷ = 10⁻⁸

Both of the result we multiply becomes:

0.238 .10⁻⁸, in the form of scientific notation becomes:

2.38 .10⁻⁹ or

2.4 .10⁻⁹ (two significant figure)

<h3>Learn more</h3>

rank number

brainly.com/question/1523983

brainly.com/question/11229113

 a composite number

brainly.com/question/857865

Keywords: scientific notation, rank number, significant figure, PEMDAS

nlexa [21]3 years ago
4 0
Use your scientific calculator
You might be interested in
uranium atoms each have 92 protons. how many protons does each u238 atom have? a. 92 b. 146 c. 238 d. 330
Brilliant_brown [7]
Number of protons as stated in the question = 92.

a. 92
4 0
3 years ago
En un recipiente colocamos unos cubos de hielo luego tapamos y observamos que sucede despues de un tiempo
SSSSS [86.1K]

Three questions come along with the given statement. It is in Spanish language:



a) Por qué se humedeció la parte exterior del frasco?


b) Por qué el hielo disminuyó su volumen y ahora es agua?


c) Por qué puede haber agua en el exterior?



These are the three answers (in English).



First question:



a) Por qué se humedeció la parte exterior del frasco?



The question is Why did the outside of the bottle get wet?



Answer:



The outside of the bottle get wet because the ice cubes cooled the walls of the bottle, so the air surrounding the bottle also cooled.



The air contains humidity (water) in gas phase. The hotter the air the more the amount of humidity it can retain, the cooler the air the less the amount of humidity it can retain.


Then, when the air close to the walls of the bootle got cooler some of the water in the air became liquid and those are the drops of water that you see in the outside of the bottle.



Second question



b) Por qué el hielo disminuyó su volumen y ahora es agua?



The question is Why did the ice diminish its volume and now it is water?



Answer:




The ice diminished its volume and now it is water, becasue the ice, which is cooler than the surroundings, received heat energy (from the surroundings) and then its temperature increased. At some moment, this temperature reached the melting point of the ice (water) and it started to become liquid.



Third question



c) Por qué puede haber agua en el exterior?



The question is: Why can there be water outside?




Answer:



The water outside is outside since the beginning: it is in the air. You do not see it because it is gas state. When the air close to the walss of the bottle got cooler, part of the water in the air became liquid.

4 0
3 years ago
A negative ion is (larger/smaller) than its parent atom.<br> Why?
Kay [80]

Answer:

When an atom attracts extra electrons it becomes a negative ion. The negative ion is larger than the original atom. The positive nucleus remains the same, with the same attractive force. However, this attractive force is now pulling on more electrons and therefore has less effect.

Or

Positive ions are formed by removing one or more electrons from the outermost region of the atom. The opposite is true of negative ions. When electrons are added to form an anion, the increased electron-electron repulsions cause the electrons to spread out more in space. Thus, anions are larger than their parent atoms.

5 0
2 years ago
20. Tell one thing that is true about these balanced chemical equations. Explain your answer. A + B → CDE.     H2 + O2 → H2O2.  
sweet-ann [11.9K]
D because the mass evens out the objct
4 0
2 years ago
For each row in the table below, decide whether the pair of elements will form a molecular or ionic compound. If they will, then
Olin [163]

Answer:

\begin{array}{cccll}\textbf{Element 1} & \textbf{ Element 2} &\textbf{Compound?} &\textbf{Formula} &\textbf{Type}\\\text{Ar}&\text{Xe} &\text{No} &\text{None}&\text{Neither}\\\text{F}& \text{Cs} &\text{Yes} &\text{CsF} &\text{Ionic}\\\text{N} &\text{Br} &\text{Yes} & \text{NBr}_{3}&\text{molecular} \\\end{array}

Explanation:

You look at the type of atom and their electronegativity difference.

If ΔEN <1.6, covalent; if ΔEN >1.6, ionic

Ar/Xe: Noble gases; no reaction

F/Cs: Non-metal + metal; ΔEN = |3.98 – 0.79| = 3.19; Ionic

N/Br: Two nonmetals; ΔEN = |3.04 - 2.98| = 0.

4 0
3 years ago
Other questions:
  • How many moles of the product fecl3 do you make, when 8moles of fe react with excess cl2
    7·2 answers
  • Chemical reaction to make a foam?​
    8·1 answer
  • In examples where the volume of a system is under constant pressure, which of
    9·1 answer
  • (05.03 MC)
    12·1 answer
  • A sample of helium has a volume of 325 mL and a pressure of 655 mmHg. What will be the pressure, in mmHg, if the sample of heliu
    11·1 answer
  • El volumen de un gas en un recipiente cerrado es de 3.5 litros a una temperatura de 25oC y una atmósfera constante de presión. ¿
    12·1 answer
  • Nồng độ mol của 200ml dung dịch Nacl chứa 0,5 mol chất tan là :
    12·2 answers
  • Help me pls!!!!!!!!!!!
    15·1 answer
  • Which of these items found on a food label IS NOT a food?
    7·1 answer
  • I need helpon science ASAP will bive brainlist
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!