Atoms are the smallest division of the element. The potassium atoms present in the 235 gm of the compound is [tex]2.57 \times 10^{24}[/tex] atoms.
What is the number of atoms?Given,
Mass (m) of Potassium sulfide [tex](\rm K_{2}S)[/tex] = 235 gmMolar mass (M) of Potassium sulfide = 110.26 g/molCalculate the number of moles as:
[tex]\begin{aligned}\rm Moles (n) &= \dfrac{\rm mass}{\rm molar\;\rm mass}\\\\&= \dfrac{235}{110.26}\\\\&=2.13\;\rm mol\end{aligned}[/tex]
In the given compound [tex]\rm K_{2}S[/tex], there are two atoms of potassium and one atom of sulphur.
If, 1 mole = [tex]2 \times 6.022 \times 10^{23}[/tex] atoms of potassium
Then, 2.13 moles = X atoms
Solving for X:
[tex]2.13 \times 2 \times 6.022 \times 10^{23} = 2.57 \times 10^{24}[/tex]
Therefore, option c. [tex]2.57 \times 10^{24}[/tex] is correct.
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a compound is found to contain 64% silver *% nitrogen and 28% oxygen by mass what is the empoircal fomula
Answer:
The empirical formula of this compound is AgNO3.
Explanation:
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Answer:
Explanation:
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How many moles are in 100.0g of each of the following compounds?
a. dinitrogen oxide (N2O)
b. methanol (CH3OH)
a. dinitrogen oxide (N2O)
O=16.00g
N=14.00g * 2 = 28.00g
So NO2 = 44.00g
You have 100g of NO2, you need moles.
So:
100g of NO2 x 1 mol NO2/44g of NO2 = your answer
b. All right. So let's go ahead and convert our 100 grams of stuff. Two moles. So starting with, we have 100 grams, uh, and 20 times we know we're gonna have one more on the top. We need the molar mass. So if we look at our periodic table, nitrogen has a molar mass of 14 point. Oh, sevens will multiply that by two. Since we have two nitrogen in our compound plus 15.999 your period table might be slightly different. That's okay. Just stay consistent with your numbers. If we add those together, we should get 44 point no. 13 grams for everyone. Mole. That's why it's ah conversion factor of the inner calculator and get 2.27 moles into right. And then, um, we have 100 grams of other substance teach your each times we know our one mole from the conversion factor will be on the tops. Wouldn't do that now and then. Carbon 12.1 Um, options. 15.99 and then hydrogen is one point 08 So I had all those together multiply by our sub scripts and get 32 point go for two calculate. That would be 3.12 moles of C H 30 H for the same mass. What this means is that CH. 30 H husband It contains more moles than in 20
What happens when baking soda and vinegar are mixed together.
Answer: Mixing vinegar and baking soda initiates a chemical reaction that produces carbon dioxide and water.
Explanation:
How does chemistry help athletes compete?
Answer: Competitive athletes at all levels – and even those who are in it for personal health – are driven by the Olympic motto Citius, Altius, Fortius – faster, higher stronger. The big question is how do they get there?
Explanation: The class is looking at these issues through a variety of eras in sports history from the first modern Olympic Games in 1896 to the Winter Olympic Games taking place this month in Pyeongchang, South Korea. “There are times when (illegal performance enhancement) has crept into the Olympics,” Roerdink said, citing the current ban handed down in December to Russian athletes accused of doping. Athletes with no previous drug violations were allowed to compete under the neutral “Olympic Athlete from Russia” flag. The class also will study Major League Baseball’s steroid era and examine the East German sports machine of the 1970s, among other timely topics. “I really wanted to share my passion for unique sporting events where we see the spotlight on the people who represent us, their passion, even the political bent to it, and figure out how chemistry comes into it,” Roerdink said. “The ultimate goal of the course is a better appreciation of doing sports for the sport of it.”
Note: I know that this is a long answer, so sorry, and this is the help from me. (Hope this helps you)
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In the Rutherford nuclear-atom model, ________.
A)the heavy subatomic particles, protons and neutrons, reside in the nucleus
B)the three principal subatomic particles (protons, neutrons, and electrons) all have essentially the same mass
C)the light subatomic particles, protons and neutrons, reside in the nucleus
D)mass is spread essentially uniformly throughout the atom
how do isotopes create electricity?
Answer:
There is at least 2 ways. First, the isotopes are allowed to heat water into steam, and the steam turns a generator. 2nd, the isotopes are allowed to heat one end of a "thermopile", and the thermopile powers electronics
Hope this helped you!
what three factors determine if something is pollutant?
Answer:
They include: Chemical nature of the pollutant - how active and toxic it is to humans, plants and animals; Concentration - the amount of the chemical per unit volume of air, water, soil, and; Persistence or longevity - how long the pollutant remains in the environment in its harmful form.
Explanation:
Air pollutants like ozone, particulate matter, carbon monoxide, nitrogen oxide, sulfur dioxide, lead cause atmospheric pollution which regards to ozone depletion, GH effect, climate change and human health effects. If anyone say the main factors of air pollution beyond of industry, means of transportation, solid waste generation and urbanization.
Growing urbanization and industrialization grows more pollution. Due to a large number of population in the world, more pollution is generated. Specifically if we talk about air pollution, due to steady increase in number of industries, the gradient level is deteriorating day by day. There is no good if we just talk about sustainable development if we are not following it.
Answer:
Explanation:
Chemical nature of the pollutant ConcentrationPersistence1. Describe the process of gene splicing.
2. What are the functions of a restriction enzyme and ligase?
Answer:
The DNA is cut using special chemicals called restriction enzymes,.
DNA ligase are used to insert genes and other pieces of DNA into plasmids.
2 NaOH + H2SO4 ------> 2 H2O + Na2SO4
What mass of H2SO4 is required to react completely with 115 g NaOH?
Question 6 options:
141.0 g H2SO4
90 g H2SO4
180 g H2SO4
5 g H2SO4
Answer:
141.0g of H2SO4
Explanation:
2 mole of NaOH reacts with 1 mole of H2SO4 completely
NaOH = 23 + 16 + 1 = 40g/mol
2 mole = 40g/mol x 2 mol = 80g
H2SO4 = 2(1) + 32 + 4(16) = 98g/mol
1 mole = 98g/mol x 1 mol = 98g
80g reacts with 98g completely
80g ------------ 98g
115g ------------ x
80x = 115 x 98
80x = 11270
x = 11270/80
x = 140.875g
x is approximately 141g
Therefore 115g of NaOH will react completely with 141g of H2SO4
Identify how energy changed form so it could be use in each example.
A space heater warms a room........
You eat dinner........
A radio plays........
I NEED THE ANSWER NOW 100 POINTS
Answer:
→A space heater warms a room⇒By converting electrical energy into heat energy.
→You eat dinner⇒Our body uses chemical energy to break down the food
→A radio plays⇒By converting electrical energy into sound energy in an electric radio. And by converting chemical energy into sound energy in a radio which runs with a cell.
Explanation:
2 KCIO3 → 2 KCl + 3 02
If 195 grams of Potassium Chlorate (FM = 122.55 grams) decomposes, how much Oxygen (FM =
32.00 grams) will be produced in this reaction?
The amount of oxygen that would be produced will be 76.38 grams
Stoichiometric calculationFrom the equation of the reaction, the mole ratio of KCIO3 to O2 is 2:3. That is, for every one mole of KCIO3 that decomposes, 1.5 moles of oxygen is produced.
Mole of 195 grams KCIO3 = 195/122.55
= 1.59 moles
Equivalent mole of O2 = 1.59 x 3/2
= 2.39 moles
Mass of 2.39 moles oxygen = 2.39 x 32
= 76.38 grams
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predict the products for the reactions and balance the equations
[tex]\bold{\huge{\blue{\underline{ Answer }}}}[/tex]
Given :-We have given equation Cacl2 + K2CO3Let's BeginWe have ,
[tex]\sf{ CaCl2 + K2CO3 \:gives \:CaCO3 + KCl }[/tex]
Let's balance it
On reactant side,
[tex]\sf{Calcium (Ca) = 1}[/tex][tex]\sf{Chlorine ( Cl = 2 }[/tex][tex]\sf{Potassium (K) = 2}[/tex][tex]\sf{Carbonate (CO3) = 1}[/tex]On product side,
[tex]\sf{Calcium (Ca) = 1}[/tex][tex]\sf{Chlorine ( Cl = 1 }[/tex][tex]\sf{Potassium (K) = 1}[/tex][tex]\sf{Carbonate (CO3) = 1}[/tex]Therefore, Balanced equation will be :-[tex]\sf{ CaCl2 + K2CO3 \:gives\: CaCO3 + 2KCl }[/tex]
The above reaction is Double displacement reaction.Double Displacement reaction :-
Double displacement reaction is a reaction in which the ions of compound on a reactant side exchanges due to the varying reactivity of elements so that they can form new products.PLZ HELP ON THESE QUESTIONSSS
Answer:
wat
Explanation:
How many grams of Oxygen are in 152.21grams of CO2?
Answer:
5.3⋅10 - 23 g
(-23 has to be small numbers above)
According to stoichiometry and molar mass concept, there are 55.34 g of oxygen in 152.21 grams of CO₂.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
According to stoichiometry , if 44 g of carbon dioxide has 16 g of oxygen then, 152.21 g of carbon dioxide will have 152.21×16/44=55.34 g.
Thus there are 55.34 g of oxygen in 152.21 g of CO₂.
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Which material would result in the greatest amount of energy transfer?
An absorber that is dark in color and rough.
A reflector that is dark in color and smooth.
An absorber that is light in color and rough.
A reflector that is light in color and smooth.
The material which would result in the greatest amount of energy transfer is a reflector that is light in color and smooth.
What is Energy transfer?This is the process by which energy is relocated from one system to another through methods such as conduction, radiation etc.
Energy is easily radiated from a light in color and smooth material as a result of its high reflective capacity which is why option D was chosen.
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Answer:
d
Explanation:
If you remove the cap of a bottle of a soft drink carbon dioxide escapes the soft drink but the soft drink is still a solution. Explain.
Answer:
Removing the cap from a soft drink bottle releases pressure and causes the excess carbon dioxide molecules to come out as bubbles. however the drink is still supersaturated , and will release that carbon dioxide till it goes flat
If you have 384.3 grams of Al(OH)3 how many moles do you have?
Explanation:
no of moles = mass / molar mass
mr of Al ( OH)3 = 27+ (16 × 3) + (1 ×3)
= 78
n = 384.3 / 78
n = 4.92692...
n = 4.93
therefore, no of moles = 4.93
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Answer: yeah i just attached a labeled picture ♀️
Kayla is examining different soil samples and making notes about how well each sample sticks together. She has two soils that she has classified as dry, ones as wet and one as cemented. Which soil property is she examining?
a. consistency
b. density
c. structure
d. texture
a. consistency because she's making notes about how well each sample sticks together.
Answer:
A. consistency
Explanation:
I took the test
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Heat change
Q1 = 27 x 4.184 x (314-273)=4631.688 J
n H₂O = 27 g : 18 g/mol = 1.5 moles
Q2 = 1.5 x 40.7 = 61.05 J
Q3 = 27 x 2.093 x (273-263)=565.11 J
Q4 = 4631.688 + 61.05 + 565.11 = 4987.848 J
Living things need to reproduce in order to propagate the species and survive. Males and females are set up in such a way that reproduction is possible, but sometimes humans do not have the ability to reproduce. Science has advanced technologies tremendously for the past few decades that artificial reproduction is now an option.
For this performance task, research and define the 4 Artificial Reproductive Technologies. After gathering information, reflect on the following questions. Write your answers based on your research on a separate sheet of paper.
a. What are the ethical implications of these technologies?
b. Should humans be allowed the ability to artificially reproduce? What is your opinion on this and why?
c. Should these technologies not exist, what would be the impact on others should one person not be able to reproduce?
Artificial reproduction technologies enables individuals unable to conceive to be able to conceive and give birth.
Although ethical issues are raised, artificial reproduction technologies are important for people who cannot naturally conceive if the technology is used within the allowed ethics.
What are artificial reproduction technologies?Artificial reproduction technologies refers to the technologies available which enables individuals unable to conceive to be able to conceive and give birth.
Some artificial reproduction technologies includes;
in vitro fertilization (IVF)gamete intrafallopian transfer (GIFT)pronuclear stage tubal transfer (PROST)tubal embryo transfer (TET)zygote intrafallopian transfer (ZIFT).The ethical implications is that humans now can choose between which babies to be born and which are not, thereby playing God.
Though, many ethical issues arise, humans should be allowed to use this technologies in order to help those who are unable to give birth to be able to do so.
Without these technologies, it would be impossible for people who can not give birth to do so, which could cause a lot of mental and physical anxiety.
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State whether the mixture of curry powder and water is a suspension or colloid
The mixture of of curry powder and water is a suspension.
What is curry powder?The curry powder is a powder formed by blending of spices and herbs which is used to give flavor to the food. The spices and herbs are mainly originated from India.What is suspension?Suspension is a heterogeneous mixture of solid particles in liquid.The solid is finely distributed in liquid.The solid is not dissolve in liquid.Example: Mixture of chalk in water, mixture of dust particles and fog/air , mixture flour in water, mixture of curry powder in water etc.What is colloid?The mixture in which substance is split into very minute particles and this particles is dispersed throughout the second substance.The minute particle of colloid is called colloidal substance.Example: Colloid of milk, muddy water, butter etc.To learn more about Suspension and colloid here.
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The characteristic which distinguishes a true solid from other phases of matter at STP is that in a true solid the particles are 1 vibrating and changing their relative positions by vibrating without changing their relative positions 2 3 motionless but changing their relative positions 4 motionless without changing their relative positions.
Answer:
Background
Solids – relatively rigid, definite volume and shape. In a solid, the atoms and molecules are attached to each other. ...
Liquids – definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded. ...
Gases – no definite volume or shape
What are examples of repurposing land as part of land reclamation? Select the two correct answers.(1 point)
reintroducing wildlife to the ecosystem
building a golf course and golf club
restoring a local waterway
creating a community garden
planting trees to replace what was removed
Answer:
Building a Golf Course and golf club & Creating a Community Garden
Explanation:
I just took a Quick check with this Question and I got if Right! Hope this helped!
The examples of repurposing land as part of land reclamation are Building a Golf Course and golf club and the act of Creating a Community Garden.
Land reclamation is known to be the method that is often used in the making or creation of new land by the act of increasing the elevation of a waterbed or low-lying land.
This can be done also by pumping water out of muddy morass areas. Land reclamation is said to be gotten by increasing the level of a seabed or riverbed.
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17. Endothermic and exothermic reactions can also be identified through observation. What might you observe that would help you identify a reaction as endothermic or exothermic? (Remember, observations can be made with any of your five senses.) (2 pts)
Answer:
•Endothermic and exothermic reactions can also be identified through observation. What might you observe that would help you identify a reaction as endothermic or exothermic?
By comparing the energy used when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall. ... Chemical reactions that absorb (or use) energy are called endothermic.
Explanation:
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Answer:
○ Endothermic reaction - a chemical reaction that absorbs energy from the surrounding environment “en-“ means in – it takes heat in – feels cold
○ Exothermic reaction - a chemical reaction that releases energy into the environment “exo-“ means out – sends heat energy out – feels warm or hot
Explanation:
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Bond energies can be measured by reacting very precisely measured quantities of reactants and very carefully measuring the change in temperature as the reaction proceeds. Name at least three sources of error in this process.
In measuring bond energy experimentally, some sources of error include;
error due to inaccurate measurements of quantities of reactantserror due to heat losseserror due to parallax in taking readings from the thermometernot all the bond energy is converted to heatWhat is bond energy?Bond energy is the energy that is require to form or break chemical bonds between atoms of reactants or products.
Bond energies can be measured experimentally using a bomb calorimeter.
The quantity of reactants are measured and the temperature changes are recorded.
This method is not accurate though as certain errors occur.
Some of the likely sources of errors include;
error due to inaccurate measurements of quantities of reactantserror due to heat lossesparallax error in taking readings from the thermometernot all the bond energy is converted to heatLearn more about bond energy at: https://brainly.com/question/16997325
Is my answer correct?
Answer:
I don't think your answer is correct, It's B
Explanation:
giving brainliest
Construct a balanced symbol equation for the formation of methane from carbon and
hydrogen. (1 mark)
Answer:
reference attached
Explanation:
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