Answer:
0.05 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.0 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.049833...[/tex]
We have the final answer as
0.05 molesHope this helps you
When delivering a presentation, pay attention to _____ and _____.
posture and eye contact
volume and the introduction
content and source citations
believability and confidence
Answer:
I think the last one
Explanation:
The reason for that is because when you go up to present something you always want to try to hav believability and confidence.
Answer:
believability and confidence
Explanation:
Where are the electrons found in the atom
Answer:
Explanation:
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
21) What is the volume (inL) of 3470 g of liquid glycerol, which has a density of 1.26 g/?
Answer:
V = 2.75 L
Explanation:
Given that,
Mass of liquid glycerol, m = 3470 g
The density of liquid glycerol, d = 1.26 g/cm³
We need to find the volume of liquid glycerol.
We know that,
Density=mass/volume
[tex]V=\dfrac{m}{d}\\\\V=\dfrac{3470\ g}{1.26\ g/cm^3}\\\\V=2753.96\ cm^3[/tex]
We know that, 1 cm³ = 0.001 L
V = 2.75 L
So, the volume of liquid glycerol is 2.75 L.
Identify the chemical reaction Below:
KOH + AlCl3 + AlCl3+ KCI
Answer:
Double displacement reaction
Explanation:
Given expression:
KOH + AlCl₃ → Al(OH)₃ + KCl
The reaction shown above is a double displacement reaction or double decomposition or double replacement reaction. This type of reaction involves an actual exchange of partners to form new compounds.
For example:
AB + CD → AD + CB
Such reactions are driving by one of the following factors:
formation of an insoluble compoundformation of water or any other non-ionizing compoundliberation of a gaseous productPhotosynthesis is the process in which plants use sunlight to convert water and carbon dioxide into glucose and oxygen. Which of these statements explains why photosynthesis is a chemical change?
A New substances are formed with properties that are different from the original substances.
B New substances are formed but their properties are the same as the original substances.
C No new substance is formed but some of the properties change.
D No new substance is formed and the change is easily reversible. Which of the following images shows a chemical change?
Photosynthesis is a chemical change as:
A. New substances are formed with properties that are different from the original substances.
What is a Chemical Change?A chemical change happens when one chemical substance is transformed into one or more different substances. A chemical change is different from a physical change, which doesn't rearrange atoms or molecules and produce a completely new substance.
Thus, correct option is A which proves that photosynthesis is a chemical change.
Find more information about Chemical change here: brainly.com/question/453535
What is the density of iron if 5.0ml has a mass of 39.5g?
Answer: p = m/Vp = 39.5 g/5.0 cm3p = 7.9 g/cm3 4.
A sealed container of liquid develops some vapor pressure. Which of the following would reduce the vapor pressure?
increase the temperature
add more liquid to the container
decrease the temperature
Answer:
Decrease the temperature
Explanation:
If you increase the temperature the vapor pressure will increase. Adding more liquid to the container is completely irrelevant.
Decreasing the temperature would reduce the vapor pressure of a sealed container of liquid. Therefore, option (C) is correct.
Vapour pressure is the pressure that the vapour phase puts on the liquid phase when the two phases are in balance. At higher temperatures, the molecules of the liquid have more energy and are more likely to move into the vapour phase. This makes the vapour pressure go up.
But when the temperature goes down, the average energy of the molecules in the liquid goes down, which slows the rate of evaporation. This means that fewer molecules are moving from the liquid phase to the vapour phase. As a result, the vapour pressure is lower.
Putting more liquid in the bottle wouldn't change the vapour pressure directly. The temperature and the type of liquid, not the amount, are what decide the vapor pressure.
Learn more about Vapor Pressure, here:
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ASAP question also in pic will get Brainiest
What is the force of an egg that is thrown at a brick wall if the egg has a mass of .03 kg and an acceleration of 50 m/s/s
Use the formula F=ma ( dont forget the units )
Answer:
F=ma
=(0.3kg) (50m/s/s)
F =15 kg per m/s/s
i need help solving this!!!
Help , thank you !!
Answer:
radioactive
nonmetal
hydrogen
liquid
rarely (since they have a full valence electron shell)
inner transition
what is the best example of energy is transferred object to object
electric energy to heat and light energy
What is the weight of 12 moles of water
220 g H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
12 moles H₂O (water)
Step 2: Identify Conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 12 \ moles \ H_2O(\frac{18.02 \ g \ H_2O}{1 \ mol \ H_2O})[/tex]Multiply: [tex]\displaystyle 216.24 \ g \ H_2O[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
216.24 g H₂O ≈ 220 g H₂O
how many molecules are in 1kg of water
Answer:
334.2× 10²³ molecules
Explanation:
Given data:
Mass of water = 1 Kg ( 1000 g )
Number of molecules = ?
Solution:
Number of moles of water:
Number of moles = mass/ molar mass
Number of moles = 1000 g/ 18 g/mol
Number of moles = 55.5 mol
1 mole contain 6.022× 10²³ molecules
55.5 mol×6.022× 10²³ molecules
334.2× 10²³ molecules
3. Which of the following items is representative of a homogeneous
mixture?
2 points
A. spaghetti & meatballs
B. cheeseburger
C. white bread dough
D. smoothie
E. Both A and B
O F. Both C and D
4. Which of the following is a chemical property of matter?
Answer: F. both c and d
Explanation:
homogeneous mixture is of same kind/phase. so the most appropriate answer we can take is smoothie and white bread dough :)
ANAGRAM: Rearrange the scrambled letters to form the correct word. Refer to the meaning of each word as your clue.Your answers should be in CAPITAL LETTERS ONLY
1. _ _ _ _
2. _ _ _ _ _
3. _ _ _ _ _ _ _
4. _ _ _ _ _ _ _ _
Atomic Radius: Complete the following:
#of Atomic A) Which element has the smaller atomic radius?
Element
Protons Radius
B) Why do you think this element has a smaller radius? (how
Be
4
153
does the number of protons affect atomic radius?)
F
147
lonization Energy: Complete the following:
Atomic
Element
1st lonization A) Which element has the smaller 1st ionization energy?
Radius Energy B) Why do you think this element has a smaller 1st ionization
He
energy? (how does atomic radius affect 1st ionization energy?)
Kr
Electronegativity: Complete the following:
# of
Element
Electroneg- A) Which element has the larger electronegativity?
Protons ativity
B) Why do you think this element has a larger electronegativity?
(how does # of protons affect electronegativity?)
Ga
Answer:
2 A): Fluorine
B): more protons, more force attraction less atomic radius
3A): Helium
B):it has small atomic radius
4 th question is not visible.....
HELPP ME !!!! DUE NOW!!!!!!
Match each element to the number of electrons in its valence shell.
Match Term Definition
Chlorine (Cl) A) Seven
Neon (Ne) B) Eight
Phosphorus (P) C) Six
Sulfur (S) D) Five
Answer:
the answer is
a
b
d
c
Explanation:
hopeit help
The correct matches will be:
Chlorine (Cl) ⇒ SevenNeon (Ne) ⇒ EightPhosphorus (P) ⇒ fiveSulfur (S) ⇒ sixChlorine has an atomic number of 17 and its electronic configuration is given by:[tex][Cl]=1s^22s^22p^63s^23p^5[/tex]
Number of valence electrons in chlorine is 7.Neon has an atomic number of 10 and its electronic configuration is given by:[tex][Ne]=1s^22s^22p^6[/tex]
Number of valence electrons in neon is 8.Phosphorus has an atomic number of 15 and its electronic configuration is given by:[tex][P]=1s^22s^22p^63s^23p^3[/tex]
Number of valence electrons in phosphorus is 5Sulfur has an atomic number of 16 and its electronic configuration is given by:[tex][S]=1s^22s^22p^63s^23p^4[/tex]
Number of valence electrons in sulfur is 6.So, from this, we can conclude that the correct matches will be:
Chlorine (Cl) ⇒ SevenNeon (Ne) ⇒ EightPhosphorus (P) ⇒ fiveSulfur (S) ⇒ sixLearn more about the valence electrons here:
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Y'all wanna help me with chemistry? The chart and bottom question for brainliest!
Answer:
As: Negative
Rb: Positive
Te: Positive
Al: Positive
24897Bk ---> 24797Bk + 10n + _____
Answer:
Explanation:
What is this?
Which is the correct order largest to smallest
Answer:
how am i suppose to put it in largest to smallest if u didnt give any numbers
John rings a doorbell.
Did John apply a force to ring the doorbell? Explain how you
know and which type of force he applied.
HELP PLEASEE
Answer:
Yes
Explanation:
Remember, Newton's third law of motion; which says in part that "Every action has an equal and opposite reaction."
Hence, in this case, the fact that the doorbell rang out implies that there was another force that was exerted on it; which is, John's finger pressing the doorbell.
In other words, when John uses his fingers to press the doorbell button he applies a force (a mechanical force), and that force results in an opposite reaction; the ringing of the doorbell.
Each of the thermometers shows a different
temperature scale. The thermometer on top
measures temperature in Celsius degrees. The
thermometer on the bottom measures temperature in Fahrenheit degrees. The
thermometers are placed so that the freezing point of water is even on each scale as a reference. The freezing point of water is 32 degrees F. If the boiling point of water is 212 degrees F, what is the boiling point of water in
degrees C (Celsius)?
Answer:
100 degrees Celsius
Explanation:
If you look at the to number lines you want to find 212 degrees Fahrenheit on the bottom line then look at the top number line where the 212 lines up which is 100 degrees Celsius.
What is one difference between Group 2 and Group 15 of the Periodic Table of Elements?
Answer:
Nitrogen group element, any of the chemical elements that constitute Group 15 (Va) of the periodic table. The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), and moscovium (Mc)
Explanation:
A balloon is inflated with helium to a volume of 45L at room temperature (298K). If the balloon is cooled to 200.K, what is the new volume of the balloon?
Answer:
V₂ = 30.20 L
Explanation:
Given data:
Initial volume = 45 L
Initial temperature = 298 K
Final temperature = 200 K
Final volume = ?
Solution;
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 45 L × 200 K / 298 k
V₂ = 9000 L.K / 298 K
V₂ = 30.20 L
2. Which of the following does not have a nucleus? a. prokaryotes b. eukaryotes c. prokaryotes and eukaryotes
Answer:
Erythrocytes
Erythrocytes do not contain a nucleus. This would make answer choice "A" correct. Erythrocytes are red blood cells and these cells differ from the other cells of the body because of the absence of the nucleus. All the other cells noted have nuclei.
Explanation:
Have A Wonderful Day !!
Answer:a. Prokaryotes
Explanation:
Select the correct answer. Which notation is used to represent gamma decay?
Answer:
B.
Explanation:
the atom has a positively charged center called the ____ and negatively charged particles called ____ revolving around the center
Answer: Positive- Protons
Negative- Electrons
Explanation:
write down the needed and important water in our life?
Answer:
Because 60 percent of our body weight is made up of water. Our bodies use water in all the cells, organs, and tissues, to help regulate body temperature and maintain other bodily functions.
Explanation:
Our bodies is made out of 60% water and even if the percentage goes down 1% we could faint. 5% and we could die. We wash off with water to clean ourselves. We use water to cook like boiling pasta. Water is a necessity not just humans need it but plants need it to grow and germinate. Hope this helps sorry it took so long. I had a fight with autocorrect.
I BET NO ONE KNOWS THIS 10. Which of the following words is closest to the same meaning as hypothesis?
fact
law
formula
suggestion
conclusion
Answer:
conclusion.
Explanation:
the ____ particles of an atom which are called electrons
Answer:
Subatomic particles
Explanation:
I hope it helped