Answer:
Percent yield = 7.1%
Explanation:
The general reaction of the problem is:
Ca(OH)₂ + CO₂ → H₂O + CaCO₃
To solve this question we need to find theoretical yield using the amount of carbon dioxide added because:
Percent yield = Actual yield (3.22g) / Theoretical yield * 100
Theoretical yield is the maximum amount of product that could be obtained. To find it we need to convert the mass of CO₂ to moles. The moles of CO₂ = Moles of CaCO₃:
Moles CO₂ -Molar mass: 44.01g/mol):
20.0g * (1mol / 44.01g) = 0.454 moles CO₂ = Moles of CaCO₃ produced
Mass CaCO₃ = Theoretical yield -Molar mass: 100.09g/mol-:
0.454 moles * (100.09g / mol) = 45.5g of CaCO₃ = Theoretical yield.
Replacing:
Percent yield = 3.22g / 45.5g * 100
Percent yield = 7.1%Which substance would be the strongest?
carbon
steel
gold
silver
Answer:
steel
Explanation:
Answer:
B. STEEL
Explanation:
True or false: All heterotrophs are omnivores.
Answer:
False. They can be both omnivores and carnivores.
If each image represents one mole of the substance pictured, which contains the greatest
amount of substance?
A)molecules
B) atoms
C)formula units
D)none; all amounts are the same
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, all amounts are the same. The correct option is option D.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Calculating the amount of a chemical in grams from moles is among the most often chemistry computations. You will employ the mole ratio of reactants to reagents when balancing equations.
Therefore, all amounts are the same. The correct option is option D.
.To know more about mole, here:
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what are the chemical properties of acids
Answer:
Acids are sour in taste. Acids react with carbonates and hydrogen carbonates to form a salt, water, and carbon dioxide gas. Extremely active metals such as Potassium (K), Calcium (Ca), Sodium (Na), etc tend to explode when combined with acids. Weak Acids like Carbonic Acid doesn't act with any metal at all.
I copied and pasted
but I hope the info helps
Question 5 of 5
When planning space exploration, scientists face many
challenges. One issue is the weight of the items being
transported. They can use the engineering design process
to help minimize the weight of materials on board a
spacecraft.
You have designed a prototype of a new, lighter material. What should be the
next step in your process?
A. Update your initial design for the new type of material.
B. Test to see
whether your material is strong and works well.
C. Figure out what problems people want to solve.
D. Brainstorm new ways to design materials.
Answer:B
Explanation: got it right on test
Test to see whether your material is strong and works well should be the next step in your process. Therefore, the correct option is option B.
What is space exploration?Space science and technology are used in space exploration to learn more about the universe. While astronomers use telescopes to explore the universe, both unmanned robotic space missions and human spaceflight also participate in the physical exploration of space.
When planning space exploration, scientists face many challenges. One issue is the weight of the items being transported. They can use the engineering design process to help minimize the weight of materials on board a spacecraft. You have designed a prototype of a new, lighter material. Test to see whether your material is strong and works well should be the next step in your process.
Therefore, the correct option is option B.
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Determine the percent yield for the reaction between 46.5 g of
ZnS and 13.3 g of oxygen if 18.l4 g of ZnO is recovered along with an unknown quantity of sulfur
dioxide.
please show work thank you
The percentage yield of the reaction has been 46.74%.
Percentage yield can be given as the ratio of the actual yield to the theoretical yield.
For the theoretical yield, the balanced equation will be:
[tex]\rm 2\;ZnS\;+\;3\;O_2\;\rightarrow\;2\;ZnO\;+\;2\;SO_2[/tex]
Thus, 2 moles of ZnS will give 2 moles of ZnO.
The moles of 46.5 g ZnS:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
ZnS = [tex]\rm \dfrac{46.5}{97.474}[/tex]
ZnS = 0.477 mol
The moles of 13.3 grams Oxygen:
Oxygen = [tex]\rm \dfrac{13.3}{32}[/tex]
Oxygen = 0.415 mol.
The moles of 18.14 grams ZnO:
ZnO = [tex]\rm \dfrac{18.14}{81.38}[/tex]
ZnO = 0.222 mol
According to the balanced chemical equation,
2 moles ZnO = 2 moles ZnS
0.222 mol ZnO = 0.222 mol ZnS
2 moles ZnO = 3 moles Oxygen
0.222 mol ZnO = 0.334 mol of Oxygen
Since, both the reactants are in enough concentration,
The theoretical yield can be calculated with any of the reactants. The theoretical yield of ZnO from 46.5 grams of ZnS can be given as:
1 mole ZnS = 1 mol ZnO
0.477 mol of ZnS = 0.477 mol of ZnO.
The mass of 0.477 mol of ZnO:
Mass = moles [tex]\times[/tex] molecular weight
Mass of ZnO = 0.477 [tex]\times[/tex] 81.38
Mass of ZnO = 38.818 grams.
The theoretical yield of ZnO = 38.818 g.
The actual yield of ZnO = 18.14 g.
Percentage yield = [tex]\rm \dfrac{18.14}{38.81}\;\times\;100[/tex]
Percentage yield = 46.74 %
The percentage yield of the reaction has been 46.74%.
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3. What tool do we use to measure force?
Answer:
A force meter
Determine the empirical formula of the compound with the percent composition of 26.6% K, 35.3% Cr and 33.0% O. *
3 points
Answer:
KCrO₃
Explanation:
26.6% K, 35.3% Cr and 33.0% O
The steps in obtaining the empirical formulae from percentage composition is given as;
Step 1:
Divide the percentage composition by the atomic mass of the elements
K = 26.6 / 39.0983 = 0.6803
Cr = 35.3 / 51.9961 = 0.6789
O = 33.0 / 16 = 2.0625
Step 2:
Divide all though by the smallest number (0.6789)
K = 0.6803 / 0.6789 = 1.002
Cr = 0.6789 / 0.6789 = 1
O = 2.0625 / 0.6789 = 3.038
The Empirical formular is the ratio between the elements. This given as;
KCrO₃
1CaC2 + 2O2 ---> 1Ca+2CO2
I need the mole to mole ratio.
Helllllp meh pleaseeeeeee
Answer:
c (clay)
Explanation:
(Help would be greatly appreciated) What is the molarity of a solution made from 325.4g of AlCl3 with enough water to make 500.0mL?
1. 4.88g
2. 4.88M
3. 2.440M
4. 2.44M
Answer:
4.88 M
Explanation:
M = number moles/Volume (L)
MM AlCl3 = 133.34 g/mol
Volume = 500 mL = 0.5 L
number moles = mass/MM = 325.4/133.34 = 2.44 moles AlCl3
M = 2.44/0.5 = 4.88 M
What are the similarities between a phylogenetic trees and cladograms.
Answer: A phylogenetic tree is an evolutionary tree that shows the evolutionary relationships between different groups of animals, Cladograms give a hypothetical picture of the actual evolutionary history of the organisms
Explanation: Hope this helps you out :)
Help pwease!!!!!!!!!!!!!!!
Answer:
B
Explanation:
I think its water desposits clay in thick , flat layers because the way how a clay feels.
PLEASE HELP: 60 POINTS
Select all that apply!
The emission of a Beta particle has the effect of:
a change in mass of an electron emitted from the nucleus
decreasing mass by one unit
increasing mass by one unit
adding a proton to the nucleus
converting 1 neutron to 1 electron and 1 proton
Answer:
all of they above
Explanation:
How many grams are in 2.50 moles of copper?
Answer:
There are 63.546 grams in a 2.50 moles of copper.
Glucose is produced through the process of photosynthesis
and is shown below. How many atoms of hydrogen are
present in one molecule of glucose?
6
3
12
24
As shown in the picture, the chemical formula for glucose is C6H12O6. This means that there are 6 carbons, 12 hydrogens and 6 oxygens in one molecule of glucose.
Your Answer: 12
How does the strength of the forces that hold the basic particles of a substance together relate to the temperature at which the substance changes state? A. Stronger forces between particles means the substance boils at a higher temperature. B. Stronger forces between particles means the substance boils at a lower temperature. C. Weaker forces between particles means the substance boils at a higher temperature. D. Stronger forces between particles means the substance melts at a lower temperature.
Answer:
A. Stronger forces between particles means the substance boils at a higher temperature
Explanation:
Certain forces hold the atoms of different matter together. These forces of attraction between the atoms (basic particle of a substance), however, play a role in how difficult it is to break the substance. The stronger the force, the difficult it is to break the substance and vice versa.
In relation to temperature, a substance with stronger force will require more heat i.e higher temperature to break the atoms. Hence, Stronger forces between particles means the substance boils at a higher temperature. In other words, the stronger the force, the higher the boiling point of that substance and vice versa.
Silver is a metal; it reacts with oxygen which is a non-metal to form Silver Oxide. The bond between Silver and Oxygen is called
(Related to Science)
Can someone help me Balance chemical equations please
Is the bond C=O polar or non polar
Answer:
Non Polar
Explanation:
Non Polar molecule because of its linear symmetric shape
Hi all!
This is the 2nd one pls help me, its easy.....
Thanks
Answer:
7. Concave and convex mirrors are called spherical mirrors because they are both made from the sphere. The difference between the two (in the simplest terms) is that diminished images form in convex mirrors while enlarged images form in concave mirrors.
8. The word ambulance is written inverted on an ambulance is because when a driver is driving and sees an ambulance in their rearview mirror, they can see the word ambulance the correct way. Otherwise the word ambulance would be backwards in the mirror. Thats why they write it backwards.
9. A plane mirror forms the image, object, etc, the same exact size that it is. The mirror can be small or large the size of the image will stay the same. So the difference between the object in a small and large plane mirror is none, there is no difference.
10. Car rearview mirrors are curved. This is to give a wider viewing angle. Flat surface mirrors give an accurate reflection. since the rearview mirrors are not flat, they are curved, they are less accurate, so thats why they have a warning label.
11. The sun emits the color of white. And as we know the color white consists of all colors. We can test this by putting the sunlight through a prism. since different colors of light travels at different speeds in the glass we cand see the light 'bent' .
12. Solar cookers use concave mirrors. This is because the mirror reflects the sunlight to a focal, 'center,' point. This center point will eventually heat up very, very hot.
If you have any questions feel free to ask - mark
Brainliest to right answer
DESPERATE WILL GIVE BRAINLIST AND THAKS
Which phrase describes how vestigial structures provide evidence that suggests a common ancestor and supports that life changes over time?
Question 3 options:
some animals exhibit similar structures, possibly due to a common ancestor
some animals exhibit similar stages of embryonic development
some animals exhibit structures that are no longer used for any purpose
some fossils exhibit similar biological proteins
Answer:
some animals exhibit structures that are no longer used for any purpose
Explanation:
Vestigial structures are defined as the the organs which are no longer used for any purpose.
Vestigial structures provide evidences of common ancestors as they shows how organisms changed or evolved in the use of these structures. for example: human appendix which is no longer functional in human body but as per Darwin's theory of evolution it was once used by our herbivorous ancestors to protect good bacteria in the gut.
Hence, the correct answer is "some animals exhibit structures that are no longer used for any purpose".
Please help me with this question tyy
Oh sheesh girl.. this is tricky.. but I can try:)
Between the chemical reaction of the chemicals and the label on the bottle the ions from in the radioactive product contained in the bottle separates the label from the surface. Im guessing that due to the "radioactive waste" in the bottle that there are components of thermal heat, that may also have an effect on the "label". So when talking about the reaction we have a chemical and thermal reaction happening.
I tried... and im sorry if it dosen't make sense... +_=||
have a wonderful day :)
Calculate the number of moles that are in 2.0 L of a 0.75 M solutions of NaCl
Answer:
1.5
Explanation:
0.75M=Moles/2L
True or false Compounds link up to make elements
Answer:
false
compound are formed from elements .
I really like chemistry but no barely anything about it so could you tell me something about it please
Answer:
2 hydrogen atoms and one oxygen atoms make h2o/water
Chemistry question please help
Answer:
a) the tendency to form hard, brittle crystals.
Explanation:
Metallic bonding occurs between metals; metals are excellent conductors of electricity, are malleable (can be hammered into thin sheets) and have luster (are shiny). Brittleness is indicative of an ionic bond or ionic compound.
How many total elements are in this compound H2SO4
Answer:
grgrrgrgrgrg
Explanation:
Answer:
2 hydrogen
2 sulphate
8 oxygen
Hey. Can someone, please help me with the following questions:
Satellites
Satellites ___________the earth.
You can see _____________ _______________ without a telescope.
An example of a man made satellite is the _____________ _____________ _____________.
The only natural satellite of the earth is the __________.
Choose from: moon, orbit, natural satellites, international space station
Planets
There are ________ planets you can see with the __________ __________.
The five planets are, _________, ___________, ___________, ___________, ___________.
The planets are part of the ___________ ___________.
Light from Saturn takes around ___________ hours to reach earth.
Choose from: 1,5, naked eye, solar system, Mercury, Venus, Mars, Jupiter, Saturn
Comets and Meteors
A _________ is a spectacular sight in the _________ sky.
They are _______ to see and could be described as giant ___________ that orbit the _______.
__________ are bits of dust and _________ that _______ up as they move through the earth’s ____________. A meteor that makes it to earth is called a ______________.
Galaxies
1. What are most of the dots of light that we see in the sky?
2. What is the name of our home galaxy?
3. What is the name of our nearest star?
4. How long does it take the light from the sun to reach the earth?
5. Can you say what some of the other dots of light in the night sky might be?
6. How many stars might there be in one galaxy?
7. What is the name of our nearest neighbor galaxy?
8. State how long it takes for the light from our neighbor galaxy to reach the earth