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
Ludmilka [50]
2 years ago
7

Do the following problem using significant figures. 4.5 cm x 2000.0 cm x 4 cm = I cm^3

Chemistry
1 answer:
Anon25 [30]2 years ago
3 0

Given :

Measurements 4.5\ cm\times 2000.0\ cm\times 4\ cm .

To Find :

The multiplication using significant figures .

Solution :

We know , the least number of significant figures in any number of the problem determines the number  of significant figures in the answer.

So , significant figure( S.F) in 4.5 cm is 2 .

S.F in 2000.0 cm is 5 .

S.F in 4 cm is 1 .

So , minimum S.F is 1 .

Therefore , S.F of their product is 1 .

Now , multiplying them we will get :

M=4.5\times 2000.0\times 4 \ cm^3\\\\M=36000\ cm^3

Now , converting 36000 in 1 significant digit .

First we will write it in exponential 2 S.F form.

3.6\times 10^4 \ cm^3

Now , to convert 3.6 into 1 S.F we should round off this .

So , round off 3.6 we will get 4 .

Therefore , The multiplication using significant figures is 4\times 10^4\ cm^3 .

Hence , this is the required solution .

You might be interested in
Match the term with its description.
Yuliya22 [10]

Photosynthesis is The process that uses sunlight energy to convert water, and carbon dioxide into high energy glucose, and oxygen.




Chloroplast is This organelle of a cell, is where chlorophyll is found. The organelle most involved in photosynthesis.








Hope that helps!!! :)



Chlorophyll is a green pigment present in all plants, that absorbs light to provide energy for photosynthesis.




Energy is the ability to do work, That can produce physical changes within living, and non-living systems.

7 0
3 years ago
How many grams are in 1.70 moles of Ca(NO3)2?
Andru [333]

The number of grams in 1.70 moles of Ca(NO₃)₂ is 384.2 grams

<h3>How to determine the mass of Ca(NO₃)₂</h3>

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

With the above formula, we can determine the mass of Ca(NO₃)₂ as illustrated below:

  • Mole of Ca(NO₃)₂ = 1.70 moles
  • Molar mass of Ca(NO₃)₂ = 40 + 3[14 + (16 × 3)] = 40 + 3[14 + 48] = 40 + 3(62) = 40 + 186 = 226 g/mol
  • Mass of Ca(NO₃)₂ = ?

Mole = mass / molar mass

1.70 = Mass of Ca(NO₃)₂ / 226

Cross multiply

Mass of Ca(NO₃)₂ = 1.70 × 226

Mass of Ca(NO₃)₂ = 384.2 grams

Thus, the mass of 1.70 moles of Ca(NO₃)₂ is 384.2 grams

Learn more about mole:

brainly.com/question/13314627

#SPJ1

4 0
1 year ago
If we add a catalyst to the following equation, CO + H2O + heat CO2 + H2, which way will the equilibrium shift?
Igoryamba

Answer:

No effect.

Explanation:

Hello,

In this case, considering the widely studied Le Chatelier's principle, we can realize that the factors affecting equilibrium are concentration, temperature and pressure and volume if the reaction is in gaseous phase and with non-zero change in the number of moles. In such a way, by adding a catalyst to given reaction will have no effect on the equilibrium direction.

Best regards.

7 0
2 years ago
What is the valence shell electronic configuration of Alkali Metals , Alkaline Earth Metals, Halogens and Noble Gases?
alisha [4.7K]

Answer:

alkali metals: 1

alkaline earth metals: 2

Halogens: 7

noble gases : 8

3 0
2 years ago
Read 2 more answers
When electromagnetic radiation of wavelength 300nm falls on the surface of sodium electrons are emitted with a KE of 1.68 * 10 5
gtnhenbr [62]

Answer:

3.83 × 10⁻¹⁹ J;  518 nm  

Step-by-step explanation:

The equation for the <em>photoelectric effect</em> is

hf = Φ + KE  

<em>Data: </em>

λ = 300 nm = 300 × 10⁻⁹ m

KE = 1.68 × 10⁵ J/mol

Calculations:

Part 1. Minimum energy to remove an electron

(a) Calculate the <em>energy of the photon</em>

fλ = c  

 f = c/λ     Divide each side by λ

E = hf

E = hc/λ

E = (6.626× 10⁻³⁴ × 2.998 × 10⁸)/(300 × 10⁻⁹)

E = 6.622 × 10⁻¹⁹ J

(b) Calculate the <em>KE of one electron</em>

KE = 1.68 × 10⁵ × 1/(6.022 × 10²³)

KE = 2.790 × 10⁻¹⁹ J

(c) Calculate the work function

hf = Φ + KE     Subtract KE from each side

Φ = 6.622 × 10⁻¹⁹  - 2.790 × 10⁻¹⁹

Φ = 3.83 × 10⁻¹⁹ J

The minimum energy to remove an electron from a sodium atom

is 3.83 × 10⁻¹⁹ J.

Part 2. Maximum wavelength to remove an electron

The photon must have just enough energy to overcome the work function and leave the electron with zero kinetic energy.

    E = Φ

hc/λ = Φ                      Multiply each side by λ

  hc = Φ λ                   Divide each side by Φ

   λ = hc/ Φ

   λ = (6.626 × 10⁻³⁴ × 2.998 × 10⁸)/(3.83 × 10⁻¹⁹)

   λ = 5.18 × 10⁻⁷ m     Convert to nanometres

   λ = 518 nm

The maximum wavelength that will cause an electron to move is 518 nm.

6 0
3 years ago
Read 2 more answers
Other questions:
  • What chemical process is used to convert oils into fats and semi solids
    13·1 answer
  • 1 Which scientist first said that "elements are made up of identical atoms
    8·1 answer
  • A group of atoms that may act as an ion is referred to as _________???
    5·1 answer
  • True or false<br><br> Depending on its temperature, matter can change forms
    9·2 answers
  • Oxygen has a total of 8 electrons, does that satisfy the octet rule? Explain why or why not.
    7·1 answer
  • Cells can regulate different processes in two ways. They can turn on and off the genes that make enzymes, or they can
    15·1 answer
  • How can you demonstrate waves?​
    6·1 answer
  • Why does it matter if atoms are divisible ???
    10·1 answer
  • Which best describes the products of a chemical reaction?
    5·1 answer
  • How long does it take for dental stitches to dissolve.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!