Answer:
Salt and sand can be separated by mixing the two substances with water. The salt will dissolve into the water, while the sand will settle at the bottom of the mixture.
Explanation:
A mixture of 80.0 g of Cr2O3 and 8.00 g of C is used to produce elemental Cr by the reaction below:
Cr2O3 + 3 C ----> 2 Cr + 3 CO
a) What is the theoretical yield of Cr that can be obtained from the reaction mixture?
b) The actual yield is 21.7 g Cr. What is the percent yield for the reaction?
Answer:
A is 90g. B is 34.7g
Explanation:
Shelly wants to find the speed that her dog can run. What should Shelly do?
A. measure the distance the dog runs
B. measure the time the dog runs
C. measure the size of the dog and the distance it runs
D. measure the time it takes for the dog to run a certain distance
Answer:A
Explanation:
All waves on the electromagnetic spectrum travel...
A
at different speed depending on their energy
B
at the speed of light (3x108 m/s)
C at different speeds depending on their wavelength & frequency
at their own pace, because they can't be bothered
Answer:B
at the speed of light (3x108 m/s)
Explanation: because it use quizlet
what will happen to the 5 pesos stack coins when you hit the coin at the bottom?why is this so?
Answer:
The correct answer is "The 5 pesos stack coins will remain at its place".
Explanation:
According to Newton's first law "every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force". In this case, hitting a single 5 pesos coin at the bottom of the stack does not represent an external force with enough energy to move the stack considerably. Therefore, the 5 pesos stack coins will remain at its place since it tends to remain at rest as any other object.
Select all the statements that correctly describe the procedure for drawing a Newman projection.
A. There will be 3 lines drawn directly to each C atom.
B. A dot drawn at the center of the circle represents the front C.
C. A circle is used to represent the back carbon.
D. A Newman projection considers one C-C bond at a time.
E. The bonds for both the front and back C atoms are drawn as lines meeting at the center of the circle.
Answer:
A dot drawn at the center of the circle represents the front C.
A circle is used to represent the back carbon.
There will be 3 lines drawn directly to each C atom.
Explanation:
A Newman projection is an alternative way to view a molecule instead of the sawhorse projection.
In a Newman projection, the front atom is shown as a dot at the center of a big circle while the back atom is shown as a circle. Three lines indicating binds to substituents are drawn to each carbon atom directly.
This method of representation of molecules was introduced by Melvin Spencer Newman in 1952 to partly replace Fischer projections. Fischer projections did not adequately show the conformer of a compound.
How many moles are in 3.48 x 1024 particles of lithium ?
Answer:
5.78 mol Li
Explanation:
Step 1: Define
Avagadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Step 2: Use Dimensional Analysis
[tex]3.48(10)^{24} \hspace{3} particles \hspace{3} Li(\frac{1 \hspace{3} mol \hspace{3} Li}{6.02(10)^{23} \hspace{3} particles \hspace{3} Li} )[/tex] = 5.78073 mol Li
Step 3: Simplify
We have 3 sig figs.
5.78073 mol Li ≈ 5.78 mol Li
Why can some atoms , such as helium , neon , and argon consist of a collection of individual atoms that move about independently of one another and all other atoms consists of two or more atoms joined by strong forces called chemical bonds ?
Answer:
Noble gases already have a completed Octet structure hence they are stable.
Explanation:
One basic reason for chemical reaction is that individual atoms seek to attain the stable Octet, that means, to have eight electrons on their outermost shell.
The noble gases are stable since they have already achieved this stable octet structure.
Having already filled electron shells, noble gases hardly participate in chemical bonding but often exist in the gas phase as isolated atoms.
The noble gases have been present as an individual atom due to the complete outer valence shell.
In an atom, the presence of valence electrons has been the representation of the reactivity of the atom.
The atoms tend to complete the outermost octet and become stable. In order to be stabilized, the elements form chemical bonds with the same element and have been present in the diatomic form.
However, with noble gases such as Neon, Helium the outer valence shell has been complete, they have been present as individual atoms with less reactivity.
For more information about the chemical bonds, refer to the link:
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The part of a voltaic cell allows ions to move between half cells so that charge doesn't build up is the ?
A. anode.
B. cathode
C. voltmeter.
D. salt bridge.
I NEED HELP ASAPPPPP!!!!!!!
Objects with similar volume always have the same mass.
True or false?
If I add 2 grams of sugar to 50 grams of water what should the mass of my
mixture be?
Answer:
[tex]m_{mixture}=52g[/tex]
Explanation:
Hello.
In this case, since your mixture is composed by sugar and water, its mass turns out:
[tex]m_{mixture}=m_{sugar}+m_{water}[/tex]
Whereas the mass of sugar is 2 g and the mass of water is 50 g, therefore, the result is:
[tex]m_{mixture}=2g+50g\\\\m_{mixture}=52g[/tex]
Best regards.
((Reuploaded)) Do all structural formulas for each amino acid have an amino group?
Answer:
All of the proteins on the face of the earth are made up of the same 20 amino acids. Linked together in long chains called polypeptides, amino acids are the building blocks for the vast assortment of proteins found in all living cells. All amino acids have the same basic structure
Which explains one reason evaporation can be used to separate a mixture? The desired component has a higher boiling point than the other components. The desired component has a different density from the other components. The mixture is a solution that contains a substance that will crystallize out. The desired component has the smallest particles in the mixture.
Answer: The component has a higher boiling point
Explanation:
Answer:
A. The desired component has a higher boiling point than the other components.
Explanation:
This is on the unit test
Water brought to the surface from deeper water is warm and nutrient-poor. *
Answer:
You made a statement not a question
Explanation:
Answer the following questions from section 1.1. Everyone's ebook should work now, please use it. Again, to access your ebook, go to jway. Look for the red connectED McGraw Hill Education icon. Click it. Click the blue launch button on the book that pops up. Look for the green ebook button on the right of the page, click it. Now you can press the buttons on the left and right to navigate through the book. If you click the button in the far upper left corner that looks like pages on a book, this will give you a drop down menu of each section. Click the drop down arrow on unit 1. Click the drop down arrow on chapter 1. Scroll down and find the lesson 1.1 Earth's Interior. Now press the arrows to the left and right to flip through section 1.1.
Answer the following questions from 1.1.
1. What are the 3 layers of the earth?
2. In your own words, describe an earthquake.
3.What is the least dense and most dense layer of Earth, and why?
4. What are the 2 types of crust of Earth?
5.What are the 2 types of earthquake waves? Which waves are fastest?
6. What is an indirect observation?
7. What are the four layers of the mantle?
8. Why is the outer core liquid but the inner core solid?
1)The earth is made up of three different layers: the crust, the mantle and the core.
2) I think an earthquake is when the tectonic plates form together and progress movement which cause floor shakiness and everything falls.
3) Earth's interior layers are ordered by density. The densest layer is the solid metal inner core, the mantle is of intermediate density, and the least dense layer is the lithosphere, particularly the continental lithosphere.
4) Earth's crust is divided into two types: oceanic crust and continental crust.
5)Surface waves travel along the surface. There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake.
6)Indirect observation involves the analysis of textual material generated either indirectly from transcriptions of audio recordings of verbal behavior in natural settings or directly from narratives.
7)The mantle is divided into several layers: the upper mantle, the transition zone, the lower mantle, and D” , the strange region where the mantle meets the outer core.
8)The outer core is not under enough pressure to be solid, so it is liquid even though it has a composition similar to the inner core. Sulfur and oxygen could be present in the outer core.
A 5 kg ball is traveling at the same speed as a 10 kg ball. Compared to with 5 kg ball, the 10 kg ball has (2 points)
Answer: twice the momentum
Explanation:
This is how manganese appears in the periodic table.
What is the arrow is pointing to?
period symbol of manganese
isotope symbol of manganese
group symbol of manganese
atomic symbol of manganese
Answer: The atomic symbol of manganese or Aka D
Explanation: I did the test
Answer:
The atomic symbol of manganese or Aka D
Explanation:
how many moles of chlorine gas is contained in 4.81x10^24 molecules
Answer:
7.99 mol
Explanation:
Step 1: Given data
Molecules of chlorine gas: 4.81 × 10²⁴ molecules
Step 2: Calculate how many moles of chlorine gas corresponds to 4.81 × 10²⁴ molecules of chlorine gas
In order to convert molecules to moles, we will use Avogadro's number: there are 6.02 × 10²³ molecules of chlorine gas in 1 mole of molecules of chlorine gas.
4.81 × 10²⁴ molecules × (1 mol/6.02 × 10²³ molecules) = 7.99 mol
Question 2
1.5 moles of copper (Cu) consists of how many atoms of copper?
Determine whether or not each combination of substances can be used to create a buffer. 0.1 M HCl, 0.1 M KCl Choose... 0.1 M HNO2, 0.05 M NaOH Choose... 0.05 M HNO2, 0.05 M NaNO2 Choose... 1 M Na2HPO4, 1 M NaH2PO4 Choose... 0.4 M KOH, 0.2 M NaOH Choose...
Answer:
Explanation:
A buffer solution is a mixture of two substances consisting of a weak acid and it's conjugate base. A buffer solution resists a change in pH.
From the description above, we can denote that a buffer must consist of a weak acid and it's conjugate base/salt.
The first option has a strong acid (HCl) and hence the solution cannot form a buffer.
The second option has a strong base (NaOH) which is not a conjugate base of HNO₂. Thus the solution cannot form a buffer.
The third option has HNO₂ which is a weak acid and NaNO₂ which is it's salt, hence it can form a buffer.
The fourth option has NaH₂PO₄ which will act as an acid while Na₂HPO₄ will act as it's salt to produce a phosphate buffer.
The fifth option has two strong bases hence cannot form a buffer
The combination which serves as a buffer solution is 0.05 M HNO2, 0.05 M NaNO2.
A buffer solution is a solution that is made up of a weak acid and its conjugate base. It is also a solution of a weak base and its conjugate acid. We need to look at the options listed and find out the option that is composed of a weak acid and its conjugate base or a weak base and its conjugate acid.
The combination which serves as a buffer solution is 0.05 M HNO2, 0.05 M NaNO2. HNO2 is a weak acid and NO2- is its conjugate base hence they compose a buffer solution.
Learn more: https://brainly.com/question/13439771
What charge does Co have in Cobalt (III) Chloride?
Answer:
+3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). . In this compound, the cobalt atoms have a formal charge of +3.
Explanation:
Answer:
+3
Explanation:
(the roman numerals tells all)
The length is 3 inches, the width It’s 4 inches, the height is 5 inches. What is the volume
Answer:
answer is 60 inches ^3.
multiply!
Which of these is most likely the cause of a father and son having almost identical-sounding voices?
O learned behaviors
O environmental conditions
O inherited characteristics
O instinctive characteristics
I tooktwo plants that like 3% NaCl environments and I put one in a 3M NaCl solution and a 0.6M NaCl solution. Describe what will happen to each plant. Hint: convert the molarity into percentag
Answer:
In the 3M NaCl solution, is plant will wilt and die due to loss of water from its cell as the solution is far too hypertonic.
In the 0.6M NaCl solution, this plant will thrive as the solution is a fairly 3% NaCl environment.
Explanation:
Molar mass of of NaCl = 58.5 g/mol, Density of water = 1 g/mL; 1 Litre = 1000 mL
3M or 3 mol/dm³ NaCl solution contains 3 moles of NaCl in 1 litre of solution.
3 moles of NaCl has a mass of 3 * 58.5 g = 175.5 g
Percentage solution = (175.7 g / 1000 g ) * 100 = 17.55% NaCl
0.6M or 0.6 mol/dm³ NaCl solution contains 0.6 moles of NaCl in 1 litre of solution.
0.6 moles of NaCl has a mass of 0.6 * 58.5 g = 35.1 g
Percentage solution = (35.1 g / 1000 g ) * 100 = 3.51% NaCl
In the 3M NaCl solution, is plant will wilt and die due to loss of water from its cell as the solution is far too hypertonic.
In the 0.6M NaCl solution, this plant will thrive as the solution is a fairly 3% NaCl environment.
Typical frequencies for several types of electromagnetic radiation are given below. Calculate the energy of each type of radiation.
a. A gamma ray: ν = 1.64 ✕ 10^20 s^−1
b. A microwave: ν = 4.95 ✕ 10^10 s^−1
c. An AM radio wave: ν = 2.00 ✕ 10^6 s^−1
Explanation:
The energy of electromagnetic radiation is given by :
[tex]E=h\nu[/tex]
Where, h is the Planck's constant
(a) A gamma ray, [tex]\nu = 1.64\times 10^{20}\ Hz[/tex]
Energy,
[tex]E=6.63\times 10^{-34}\times 1.64\times 10^{20}\\E=1.08\times 10^{-13}\ J[/tex]
(b) A microwave, [tex]\nu = 4.95\times 10^{10}\ Hz[/tex]
Energy,
[tex]E=6.63\times 10^{-34}\times 4.95\times 10^{10}\\E=3.28\times 10^{-23}\ J[/tex]
(c) A AM radio wave, [tex]\nu = 2\times 10^{6}\ Hz[/tex]
Energy,
[tex]E=6.63\times 10^{-34}\times 2\times 10^{6}\\E=1.32\times 10^{-27}\ J[/tex]
Therefore, this is the required solution.
WILL GIVE BRAINLYEST The following element has how many protons?
silicon
14
SI 28.086
Question 9 options:
14
56
7
28
Answer:
14.
Explanation:
Answer:
14 hope this helps
Explanation:
Atomic Mass-Atomic Number my guy
Is tardigrade living or non-living? Explain why?
Answer:
When tardigrades have enough food and water to support their bodily functions, they live out the natural course of their lives, rarely lasting for longer than 2.5 years, according to Animal Diversity Web, a database run by the University of Michigan.
Explanation:
Mass = 25g, Volume = 5mL. What is the density? *
Answer:
5ml
Explanation:
m/v
25/5=5
means 25÷5=5
can a mixture be formed into a compound?
A mixture cannot be formed in to a compound as formation of mixtures is accompanied by physical changes and formation of compounds is accompanied by chemical changes.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds. Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
Learn more about compounds,here:
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The following question was posed on an exam:
An unknown non-metal element (Q) forms two gaseous fluorides of unknown molecular formula. A 3.2g sample of Q reacts with fluorine to form 10.8 g of the unknown fluoride A. A 6.4 g sample of Q reacts with fluorine to form 29.2 g of unknown fluoride B. Using these data only, demonstrate by calculation and explanation that these unknown compounds obey the Low of Multiple Proportions.
A student responded with the following answer: The Law of Multiple Proportions states that when two elements form two or more compounds, the ratios of the masses of the elements between the two compounds are in o simple whole number ratio. So, looking of the data above, we see that the ratio of the moss of element Q in compound A to the mass of element Q in compound B is, which is a simple whole number ratio. This demonstrates that these compounds obey the low of Multiple Proportions. Assess the accuracy of the students answer. In your assessment, you must determine what information is correct or Incorrect, provide the correct information where needed, explain whether the reasoning is logical or not, and provide logical reasoning where needed.
Answer:
The answer given by the student is not totally correct.
Explanation:
Law of multiple proportions states that an element Q will react with different volume of Fluorine to produce two non-similar compounds. Hence, the ratio of the masses(Fluorine only) needs to be an absolute reduced value.
Given that:
3.2 g of a sample of Q reacts with Fluorine to form 10.8 g of the unknown fluoride A.
This means the mass of Fluorine present in the compound = 10.8 g - 3.2 g = 7.6 g
Thus, 3.2 g of a sample of Q reacts with 7.6 g of Fluorine.
Also, 6.4 g sample of Q reacts with Fluorine to form 29.2 g of unknown fluoride B.
If we divide the samples by (2), we have 3.2 g sample of Q reacting with Fluorine to form 14.6 g of unknown fluoride B.
This means the mass of Fluorine present in the compound = 14.6 g - 3.2 g = 11.4 g
Thus, 3.2 g Q reacted here with 11.4 g fluorine.
Hence, 11.4/7.6 = 1.5 = 3/2
This above therefore satisfies the law of multiple proportions.
This is not aligned with what the student did, what the student did was to relate the amount of Q used to make A and B. Suppose, we start with twice amount of Q, the ratio would have been smaller(i.e. the ratio of Q).
So, this doesn't relate to the law of multiple proportions.
The law of multiple proportions is specifically concerned with the mass of the element rather than Q that can react with Q. Therefore, there is more reason to relate the two samples of equal masses of Q that react with different masses of Fluorine. The ratios of Fluorine will then be small whole numbers.
Which of the following is a form of mechanical energy?
Group of answer choices
Thermal energy
Kinetic energy
Chemical energy
Nuclear energy
Answer:
thermal energy
Explanation:
due to the heat
Answer:
Answer:kinetic energy
Explanation:
Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position).