Answers
Answer:
6. 13.8 moles
7. 0.751 moles
8. 2.04 moles
9. 0.00794 moles
10. 0.158 moles
Explanation:
When converting from atoms to moles, use Avogadro's number.
Avogadro's number is 6.02 x 10^23.
After that, then use dimensional analysis for every problem to show your work.
6. (8.31 x 10^24 atoms of magnesium) * 1 mol Mg / (6.02 x 10^23) atoms = 13.80398671.
With sig figs however, it rounds to 13.8. Therefore, there are 13.8 moles of magnesium.
7. (4.52 x 10^23 formula units NaCl) * 1 mol NaCl / (6.02 x 10^23) atoms = 0.750830565.
With sig figs however, it rounds to 0.751. Therefore, there are 0.751 moles of NaCl.
8. (1.23 x 10^24 molecules CO) * 1 mol CO/ (6.02 x 10^23) atoms = 2.043189369.
With sigs figs however, it rounds to 2.04. Therefore, there are 2.04 moles of CO.
9. (4.78 x 10^21 molecules O2) * 1 mol O2 / (6.02 x 10^23) atoms = 0.007940199.
With sigs figs however, it rounds to 0.00794. Therefore, there are 0.00794 moles of O2.
10. (9.50 x 10^22 atoms of C) * 1 mol C / (6.02 x 10^23) atoms = 0.157807309.
With sig figs however, it rounds to 0.158. Therefore, there are 0.158 moles of C.
Hope it helped! Did I explain better than your teacher?
Answer:
6. 13.8 moles
7. 0.751 moles
8. 2.04 moles
9. 0.00794 moles
10. 0.158 moles
Explanation:
Related Questions
In the following compound (NaCl), can you please tell me the following:
Is it an ionic or covalent compound?
How many valence electrons does Na have?
How many valence electrons does Chlorine have?
How many electrons are gained and lost by each atom
Answers
Answer:
Ionic
Na has one valence electron
Chlorine has seven
Sodium loses one electron
Chlorine gains one electron
The pattern of atoms and molecules give matter it’s ______
What is the blank?
Answers
Answer: Try mass that’s the best guess I can give off the top of my head
Explanation: An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms come together which forms molecules. These molecules interact to form solids, gases, or liquids.
This atom has 2 protons, 2 neutrons, and 2 electrons. Draw in the electrons
please help me!!!
Answers
Answer:
The electrons should go outside the nucleus but should be somewhere in the "cloud" so the electrons should be drawn on the grey circle but not on the white.
Answer:
you just draw them in the outer line
Explanation:
In an experiment to find the concentration of calcium hydroxide in limewater , 25.0 cm3 of limewater needed 18.8 cm3 of 0.0400 mol/dm3 hydrochloric acid to neutralise it.
Answers
Answer:
0.01504 mol/dm3
Explanation:
Calcium Hydroxide - Ca(OH)2
Hydrochloric acid - HCl
The reaction between both is given as;
2HCl + Ca(OH)2 --> CaCl2 + 2H2O
2 : 1
The relationship between the concentration and volume is given as;
CaVa / CbVb = na / nb
where a = acid (HCl) and b = base Ca(OH)2
Inserting the values;
0.04 * 18.8 / (Cb * 25) = 2 / 1
0.752 / 25Cb = 2
Cb = 0.752 / 50 = 0.01504
please help again I'm timed again
Answers
Answer:
melting evaporation
Explanation:
melting decreases because its melting out of form
Answer:the answer should be A E and F
Explanation:
They all use decreased energy
JJ thomson experiment the atomic theory?
Answers
How many moles of Zn are there in 4.50 x 1024 atoms?
Answers
Answer:
7.48 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{4.5 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 7.475083...[/tex]
We have the final answer as
7.48 molesHope this helps you
If the forest is left untouched, how will the forest change over time?
O The forest will remain unchanged.
O The forest will be repopulated by trees and eventually become a forest again.
The area will erode and remain without life.
O The area will become a completely different habitat such as a desert or plain.
Answers
Answer:
the answer is b and if your seeing this hope you have a good live
Explanation:
BBBB
How is the heat generated by the reactor core of a nuclear power plant used to provide power to buildings?
a.
It is used directly to heat homes and offices.
b.
It generates steam, which turns a turbine, powering a generator.
c.
It generates steam, which is then condensed back to water. This process produces energy.
d.
All of the above
Please select the best answer from the choices provided
A
B
C
D
Answers
The heat generated by the reactor core of a nuclear power plant used to provide power to buildings by generating steam, which turns a turbine, powering a generator and the correct option is option C.
What are Nuclear Power plants?Nuclear power plants are a type of power plant that use the process of nuclear fission in order to generate electricity.
The steam is used to spin large turbines that generate electricity. Nuclear power plants use heat produced during nuclear fission to heat water.
In nuclear fission, atoms are split apart to form smaller atoms, releasing energy. Fission takes place inside the reactor of a nuclear power plant.
Nuclear power plants are very similar to coal-fired power plants. However, they require different safety measures since the use of nuclear fuel has vastly different properties from coal or other fossil fuels.
Therefore, The heat generated by the reactor core of a nuclear power plant used to provide power to buildings by generating steam, which turns a turbine, powering a generator and the correct option is option C.
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Need help with pt 3 of Density worksheet
Answers
formula p=m/V
Explanation:
0.79
6.35
1.79
To find the density you have to divide the mass by volume
hope it helps!
Predict which moon phase will occur about one week after a full moon?
Answers
Answer:
waning gibbous I belive
Explanation:
Answer:
third quarter moon
Explanation:
-Identify the reactants and the
products. a.) carbon + oxygen --> carbon dioxide
b.) potassium + water --> potassium hydroxide +
hydrogen
Answers
Answer:
carbon dioxideis the product
potassium + water is the product
Which statement about atoms during a chemical change is true?
Answers
Answer:
In a chemical reaction, only atoms are present in the reactant and can end up with molecules. No new atoms are created and no more atoms are destroyed. In a chemical reaction, reactants contact with each other and the bond between atoms in the reactant is broken and atoms rearrange and form new bonds to make the product.
Explanation:
as the depth of the ocean increases the amount of sunlight and water temperature will..
Answers
Answer:
Decrease
Explanation:
The lower you go, the colder because the sun can't reach lower levels of the ocean.
Answer:
decrease
Explanation:
less sunlight will be able to reach the farther down you go and the less sunlight there is the colder it gets
Which salt is produced when NH OH reacts with HNO3?
A: KNO2
B: NaNO3
C: NH4NO3
D: NH4NO2
Answers
Answer:
C. NH4NO3 ammonium nitrate is formed when the two acid and base react
A mixture of hydrogen and oxygen gases has a total pressure of 5.50 atm. What is the partial pressure of the hydrogen if the P(O2) = 1250 mm Hg?
Answers
Answer:
P O 2 = 5.21 atm P C O 2 = 4.79 atm
Explanation:
Hope it helps!
Perform the following mathematical operation and report the answer to the appropriate number of significant figures 0.2543 + 0.46
Answers
Scientists now understand that light behaves as
a
a. particle only
b. neither a particle nor a wave
c. both a particle and a wave
d. a wave only
Answers
Answer:
C. both particle and a wave
Answer: C. Both a Particle and a Wave
Explanation:
Light can travel as particles or like waves. We can see it traveling like particles when a firefly glows. That is still a version of light. It travels as a wave when you turn on your light, faster than sound can. These are the two versions of light, particle and wave. The answer is C. Both a Particle and a Wave
What properties make silicon effective in making solar panels? List 5 properties.
Answers
Answer:
Silicon is one of the highest quality semiconductors that is ideal for solar cell production. The superior quality of silicon’s electronic, optical, thermal, and environmental properties are best for producing solar cells. Also, the availability and affordability make it more usable for solar panels.
These are the five properties. Hopefully, this helps! :)
Determine the number of atoms of 25 g iron(II) chloride
Answers
Answer:
3.56x10²³ atoms
Explanation:
To solve this question we need first to determine the moles of iron (II) chloride, FeCl₂, using its molar mass. Then, using Avogadro's number we can solve for the number of atoms:
Moles FeCl₂ - Molar mass: 126.751g/mol-
25g FeCl₂ * (1mol / 126.751g) = 0.1972 moles
Number of atoms:
1 mole of FeCl₂ are 6.022x10²³ molecules of FeCl₂, that means 0.1972moles are:
0.1972mol * (6.022x10²³ molecules / 1mol) = 1.188x10²³ molecules of FeCl₂
In 1 molecule of FeCl₂ there are 3 atoms (1 of Fe and 2 of Cl), in 1.188x10²³ molecules of FeCl₂ there are:
1.188x10²³ molecules of FeCl₂ * (3atoms / molecule) =
3.56x10²³ atomsHow many oxygen atoms in C10H20
Answers
Answer:
One oxygen atom I think..as C10 is 10 atoms of carbon, and H20 is two atoms of hydrogen with one atom of oxygen
Explanation:
The lock and key model is used to explain how enzymes work. use this model to explain why an enzyme only works with a particular molecule?
Answers
Answer:
The lock and key model is used to explain how enzymes work.
Explanation:
An enzyme is a protein that functions as a biological catalyst . Enzymes are folded into complex shapes that allow smaller molecules to fit into them. The place where these molecules fit is called the active site.
The lock and key model was given by Emil Fischer in 1984 . According to this model the active sites of the enzymes have a specific geometric shapes wherein the substrate molecules fit in just like a key in a particular lock.
The lock and key model of an enzyme action is based upon structural complimentarity between the substrate molecule and the enzyme active site . Thus specific enzyme molecules will interact with specific substrate molecules only .
This specific action of an enzyme with a single substrate can be explained using lock and key analogy . In this analogy the lock is the enzyme and the key is the substrate . Only correctly sized key ( substrate ) fits into the key hole ( active site ) of the lock ( enzyme )
Roller coaster cars move slowly at the top of the hill, so they have little kinetic energy. The speed of the cars increases as they move down the hill. This increased the cars' kinetic energy. Where might this extra kinetic energy have come from?
a.) kinetic energy was added by pushing the cars
b.) potential energy was transformed into kinetic energy
c.) the cars always had kinetic energy
d.) kinetic energy was transferred into potential energy
Answers
Answer:
b.) potential energy was transformed into kinetic energy
Explanation:
According to the law of conservation of energy, energy is neither created nor destroyed but transformed from one form to another in a system.
So, in this system, energy is not created neither is it destroyed.
The increase in kinetic energy of the car is due to the conversion of potential energy to kinetic energy. Potential energy is due to the position of a body. As the car winds down the hill slope, the potential energy is transformed to kinetic energy. Also, the velocity of the body increases.To launch a rocket, liquid oxygen and liquid hydrogen are combined inside the rocket engine to react explosively. How do you think scientists take into account the law of conservation of mass when they calculate the amount of fuel needed for a rocket launch?
Answers
Answer:
Explanation:
In this chemistry lab, students investigate how to build and launch a simple rocket that uses hydrogen and oxygen gases that will be mixed to propel the rocket (large bulb plastic pipette). Students will understand the principles of combustion reactions, kinetics, stoichiometry of reactions, activation energy, explosive mixtures, rocketry, and different types of chemical reactions. Students will explore and determine the proportions of hydrogen and oxygen mixture that will achieve the best launch results. Students will compare the balanced chemical reaction of hydrogen and oxygen with their lab results; students should discover that the optimal distance occurs when the mixture of hydrogen and oxygen is two to one hydrogen, oxygen mixture ratio and this can be determined theoretically from the balanced chemical reaction equation. Students will perform the lab, collect data, and discuss, compare, and contrast their lab findings with the balanced chemical reaction equation. Students will present their structured inquiry investigations using a power-point presentation. Other groups along with the teacher will assess each group by using a provided rubric. Group assessments will be the deciding assessment for the final lab score. A follow up activity could investigate how NASA scientists launch real rockets into space and propose a procedure to investigate and collect data on a launching a heavier object at the school football field.
Which of the following statements about the elements in group 2 of the periodic table is true?
They all tend to become positive ions when they bond with other elements.
They all have similar chemical and physical properties.
They all have two electrons in their outermost shell.
They are all metals.
Answers
Answer:
they all have two electrons in their outermost shell
The elements of group 2 are alkaline earth metals that have two electrons in their outermost shell. So they have similar chemical and physical properties and tend to become positive ions in bond formation.
What are the properties of the elements of group 2?The elements present in group 2 include Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.
The elements of group 2 are similar in their physical and chemical properties as all the elements have the same number of valence electrons. All alkaline earth metals are silvery-white-colored solids under normal conditions. They are also shiny and quite reactive.
The general electronic configuration of group 2 elements is ns². The alkaline earth metals have fully filled s-orbital in their valence shells, they tend to lose two electrons to produce cations with +2 charge.
Therefore, the elements of group 2 are electropositive in nature. Therefore, all the given statements about group 2 of the periodic table are true.
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What caused these substances to come together in a ball in space? *
Answers
Answer:My guess is the gravitational force between the objects or substances.
100 POINTS!!
Solid aluminum, Al(s), is dropped into hydrochloric acid, HCl(aq). The masses of the substances are listed below.
Mass of Al = 700g
Mass of HCl = 3000g
1. Write a balanced equation for the reaction.
2. Identify the limiting reactant and theoretical yield. Show your work.
3. A given trial of this reaction produced 3262g of AlCl3. What is the percent yield of the reaction. Show your work.
Answers
Answer:
Isnt it only 50 points??????????????????
Find the wavelength of the electromagnetic radiation with a frequency of 3*10^ ^ -18 Hz *
Answers
Answer:
[tex]\lambda=10^{26}\ m[/tex]
Explanation:
It is given that,
The frequency of the electromagnetic radiation, [tex]\lambda=3\times 10^{-18}\ Hz[/tex]
We need to find the frequency of the electromagnetic radiation. The relation between the frequency and wavelength is given by :
[tex]c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3\times 10^{-18}}\\\\=10^{26}\ m[/tex]
So, the wavelength of the electromagnetic radiation is [tex]10^{26}\ m[/tex].
Please help me with this chem question it’s due by midnight. I know the answer choice isn’t C.
Answers
Answer:
I believe the answer is A
Explanation:
I hope this helps :)
The amplitude of a wave is
A. the distance between the crest and the trough of the wave
B. the distance the wave moves in one second
C. the distance equal to one wave length
D. the distance the wave moves in one time period of the wave
Answers
Answer:
the answer is A.
Explanation:
I hope this helps have a fantastic day!
Answer:
None of these
Explanation:
Amplitude is the distance from rest to crest.
Option A isn't the right answer
Option A is wavelength