Which molecule is polar?
A. CO2
B. PF3
C. CH4
D. BF3
What is carbon? What does it do?
Answer:
Carbon is in carbon dioxide, which is a greenhouse gas that works to trap heat close to Earth. Carbon is the chemical backbone of life on Earth. Carbon compounds regulate the Earth's temperature, make up the food that sustains us, and provide energy that fuels our global economy. Most of Earth's carbon is stored in rocks and sediments. The rest is located in the ocean, atmosphere, and in living organisms
Explanation:
Hope it helps. Can you give me BRAINLIEST ANSWER. Thank you
Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3+3CO→2Fe+3CO2
If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the reaction and how many grams will be remaining?
The 0.118 moles are the mass Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3+3CO→2Fe+3CO2.
Limiting and Excess Reactants:There are sorts of reactants which can be utilized in a chemical response process, those are the proscribing reactant and the extra reactant. There is continually a leftover quantity of the extra reactant after a response. The most quantity of merchandise that may be produced relies upon at the proscribing reactant.
mass of Fe2O3, mFe2O3 = 23.zero gmass of CO, mCO = 15.forty gmolecular weight of Fe2O3 MWFe2O3 = 159.sixty nine g/molmolecular weight of CO MWCO = 28 g/molFirst, we display the balanced chemical response:Fe2O3 + 3CO --> 2Fe + 3CO2First, we convert the loads of the reactants into moles the usage of their molecular weight:
Solving for moles of Fe2O3, nFe2O3,
nFe2O3=mFe2O3MWFe2O3=23.0g159.69gmolnFe2O3=zero.144molesSolving for moles of CO, nCO,nCO=mCOMWCO=15.4g28gmolnCO=zero.55molesIn figuring out the proscribing and extra reactants, we decide the moles required for every reactant if we used all of the given moles adjusted consistent with their mole ratio withinside the balanced response.
The moles ecess reactant =nCO−nCOx=zero.fifty five−zero.432=0.118 molThe mass of the extra reactant left is calculated the usage of its moles and molecular weight,
massexcessreactantleft=mCO×M.
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A(n)
is a group of organs that work together to perform a cormmon function.
cell
tissue
organ
organ system
If you get a root canal or any other potentially painful procedure done at the dentist's office, he or she will probably inject your gums with a local anesthetic to "numb the pain." Neurons that trigger pain are called nociceptors. They trigger pain in order to alert the body to potentially dangerous stimuli. Most local anesthetics hinder the activity of all local neurons, not just nociceptors, so pain is not the only sensation that goes away temporarily. Because all feeling is gone, you can end up drooling on yourself without knowing it.
Considering this information about local anesthestics, which of the following statements best demonstrates that science is an ongoing process that changes in response to new information and discoveries?
A. There are a variety of local anesthetics being used today, including lidocaine, prilocaine, and mepivacaine.
B. Sir Charles Sherrington, who discovered nociceptors, wrote a book about the nervous system that helped show its role in allowing organisms to adapt to their environments.
C. Unlike a local anesthetic, a general anesthetic causes a person to lose consciousness rather than sensation in one area.
D. Scientists have discovered a way to use a compound found in hot peppers, capsaicin, along with an anesthetic in order to block nociceptors only.
PLEASE HELP ASAP The concentration of a solution is equal to the mass of solute divided by the volume of solvent. Units of concentration are grams per 100 milliliters, g/100 mL. You add 12g of sugar to 100 mL of water. What is the concentration?
. 12 g/100mL
12 g/100mL
12g
120g
Answer:
120 g is the answer I think
what does Le châteliers principle state?
how to find molecular mass of ammonia.
Please give proper answers only, inappropriate answers will be reported, the best ones will be marked as brainliest.
Answer:
17.03052 g/mol
Explanation:
Ammonia formula is given as NH3.
To estimate the molar mass of any compound, we have to add up the molar masses of every atom of the given compound. Ammonia comprises of one nitrogen atom and three hydrogen atoms.
So the molar mass of ammonia is
N: 14.0067 g/mol
H: 1.00794 g/mol
The molar mass of ammonia will thus be
14.0067 g/mol +3× 1.00794 g/mol =17.03052 g/mol
If an atmosphere consisting of an ideal gas were indeed homogeneous (constant density) all the way to the top at z = H, find the temperature at that top. Could such an atmosphere actually exist, even in principle? Why or why not?
The temperature at the top of an atmosphere consisting of an ideal gas with constant density can be found using the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
Assuming the density of the gas is constant throughout the atmosphere, we can express the pressure as P = ρgh, where ρ is the density, g is the acceleration due to gravity, and h is the height.
Since the atmosphere is homogeneous, the pressure at the top (P_top) is the same as the pressure at the bottom (P_bottom), so we have P_top = P_bottom = ρgh.
Using the ideal gas law, we can write ρghV = nRT, where V is the volume of the gas.
Assuming the volume of the gas is constant, we can cancel out V, and rearranging the equation, we get T_top = (nRT_bottom)/(nR) = T_bottom.
Therefore, the temperature at the top of the atmosphere would be the same as the temperature at the bottom.
In practice, however, it is not possible for an atmosphere to have constant density all the way to the top. As we go higher in the atmosphere, the density decreases due to decreasing pressure and temperature. This is because gravity becomes weaker at higher altitudes. Therefore, in reality, the temperature would decrease as we move higher in the atmosphere.
So, while a homogeneous atmosphere with constant density all the way to the top cannot exist in practice, it can be considered as an idealized scenario for understanding certain aspects of atmospheric behavior.
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Write the formula for the given compounds:
1. Nitrogen trichloride
2. Boron monocarbide
3. Dinitrogen trioxide
4. Phosphorus pentafluoride
The chemical formula are given as per the atoms which are present in the compound,thus chemical formula of the compounds which are serially numbered are \(NCl_3,B_4C,N_2O_3,PF_5\).
Nitrogen trichloride is a compound made up of nitrogen and chlorine. The prefix "tri-" indicates that there are three chlorine atoms bonded to one nitrogen atom. The formula for nitrogen trichloride is \(NCl_3\).
2. Boron monocarbide is a compound composed of boron and carbon. The prefix "mono-" indicates that there is only one carbon atom bonded to one boron atom. The formula for boron monocarbide is \(B_4C\).
3. Dinitrogen trioxide is a compound made up of nitrogen and oxygen. The prefix "di-" indicates that there are two nitrogen atoms, and the prefix "tri-" indicates that there are three oxygen atoms. The formula for dinitrogen trioxide is \(N_2O_3\).
4. Phosphorus pentafluoride is a compound composed of phosphorus and fluorine. The prefix "penta-" indicates that there are five fluorine atoms bonded to one phosphorus atom. The formula for phosphorus pentafluoride is \(PF_5\).
Thus chemical formula of the compounds which are serially numbered are \(NCl_3,B_4C,N_2O_3,PF_5\).
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why should cleaning supplies be stored away from food
Cleaning supplies should be stored away from food for several important reasons:
1. Contamination: Cleaning supplies often contain chemicals that can be harmful if ingested. If they come into contact with food, they can contaminate it and pose a risk to human health. Some common cleaning agents, such as bleach, ammonia, and disinfectants, can cause nausea, vomiting, diarrhea, or more serious health issues if consumed.
2. Chemical reactions: Certain cleaning products can undergo chemical reactions when they come into contact with certain food items. For example, mixing bleach and acidic foods or liquids (such as vinegar, citrus fruits, or juices) can create toxic chlorine gas. Storing cleaning supplies near food increases the risk of accidental mixing or spillage, leading to dangerous chemical reactions.
3. Packaging mix-ups: Cleaning supplies and food items often come in similar packaging, such as spray bottles or containers. Placing them in close proximity increases the chances of mistakenly using the wrong product. Consuming cleaning products can be extremely hazardous and cause severe harm or even death.
4. Cross-contamination: Even if the cleaning supplies don't directly contact the food, there is still a risk of cross-contamination. Residual chemicals or fumes from the cleaning supplies can migrate to nearby food items, compromising their safety and quality.
To ensure food safety, it is crucial to store cleaning supplies in a separate, designated area away from food storage areas, preferably in a locked cabinet or a well-ventilated storage space. It's important to read and follow the instructions on cleaning product labels, use them as intended, and keep them out of reach of children and pets.
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If it requires 75.0mL of 0.500M NaOH to neutralize 165.0 mL of an hcl solution what is the concentration of the hcl solution
Answer:
0.027 M HCl
Explanation:
The chemical equation of the neutralization is:
1 NaOH + 1 HCl -> 1 H2O + 1 NaCl
Because the ratio of NaOH and HCl is 1:1 you can use the M1V1=M2V2 formula.
(75 mL)(0.5 M NaOH) = (165 mL)(M HCl)
It requires 0.027 M HCl.
Identify the bacteria that are responsible for turning nitrogen from the atmosphere into usable nitrogen for plants.
Rhizobium bacteria were soil microbes that have the ability to convert dissolved nitrogen from the atmosphere. These root nodules on woody plants contain rhizobium bacteria.
What kind of bacteria releases nitrogen into the air?The nitrogen cycle is finished by denitrification, which turns nitrate (NO3-) back into gaseous nitrogen (N2). The driving force behind this procedure is denitrifying microorganisms. These bacteria generate energy from nitrate rather than oxygen, which results in the release of nitrogen gas into the environment.
What three kinds of bacteria utilise nitrogen?Azotobacter, Bacillus, Clostridium, or Klebsiella species are a few instances that belong to this category of nitrogen-fixing bacteria. These organisms must acquire their own energy source, as was previously said. Typically, they do this by oxidising organic molecules generated by the other organisms or as a result of decomposition.
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Please Help!!! Due tomorrow!!!
1. Which would have a higher mass? (1 mole of lead or 1 mole of iron) Explain (points will be
taken off if you don't explain!)
2. Which would have more atoms? (1 mole of lead or 1 mole of iron) Explain (points will be taken
off if you don't explain!)
3. Which would have a higher mass? (1.65 mole of sucrose, C12H22O11 or 6.23 moles of sodium
acetate) Show all calculations!
4. Why are molar masses used to obtain a quantity of substance rather than simply counting the atoms or molecules?
Answers and explanations:
1) Lead, it is heavier than iron.
2) Lead, since it's heavier, it would have more mass and therefore more atoms.
3) (for sodium) 82.03379 gram x 6.23= 511.070512 grams= 417.05 pounds
(for sucrose) 342.29648(one molar) x .65= 0.4 pound
The sodium would be heavier (not sure if accurate)
4) Because atoms are way too small to count, therefore we use molar masses.
please help with the question tagged below
Answer:
It can lose it's electrion
Explanation:
Write a balanced equation for the reaction which occurs with the CaCL2 solution. [Please use fatty acid-CO2 - Na as the structure for your beginning soap.]
The balanced chemical equation for the reaction of calcium chloride (CaCl₂) with a fatty acid (R-COOH) to form soap (R-COONa) and carbon dioxide (CO₂) is:
CaCl₂ + 2 R-COOH → R-COONa + CO₂ + 2 HCl
In this reaction, calcium chloride (CaCl₂) reacts with a fatty acid (R-COOH), which is the structure of a typical soap molecule, to form soap (R-COONa) and carbon dioxide (CO₂) as products. The balanced equation is obtained by ensuring that the number of atoms of each element is the same on both sides of the equation.
To balance the equation, the coefficients of the reactants and products are adjusted. In this case, two molecules of the fatty acid are required to react with one molecule of calcium chloride to form two molecules of soap, one molecule of carbon dioxide, and two molecules of hydrochloric acid (HCl) as a byproduct.
The balanced equation represents a stoichiometric ratio between the reactants and products in the chemical reaction.
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bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 193 mg of bismuth-210, how much remains after 6 days?
After 6 days, approximately 56.5 mg of bismuth-210 remains.
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explain how comparative anatomy supports the theory of natural selection and evolution.
Comparative anatomy is the study of similarities and differences between the body structures of different species. The study of comparative anatomy supports the theory of natural selection and evolution.
Here's how:How comparative anatomy supports the theory of natural selection and evolution?Charles Darwin, the father of the theory of evolution, recognized that different species share common anatomical features, such as a similar bone structure. He hypothesized that if a species could use the same bone structure to perform different functions, the bone structure could be adapted over time to perform these new functions better.
This was a radical idea at the time because most scientists believed that species were created separately. However, Darwin's ideas were supported by the study of comparative anatomy, which showed that many species share similar structures, indicating that they share a common ancestor. Comparative anatomy also shows that species have adapted over time to perform new functions as they evolved.Comparative anatomy has also helped scientists understand the evolutionary history of different species. By comparing the structures of different species, scientists can identify which structures evolved first and how they evolved over time. This helps scientists create a timeline of how different species have evolved over millions of years.Comparative anatomy is just one of many pieces of evidence that supports the theory of natural selection and evolution. However, it is an important piece of evidence because it shows that different species share a common ancestry and have adapted over time to better survive in their environment.
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HELP PLEASE 1pt
Identify the object that has the greatest gravitational pull.
A.
a tennis ball
B.
the moon
C.
the sun
D.
Earth
The object with the greatest gravitational pull is the Earth (option D).
What is gravitational pull?Gravitational force is a very long-range, but relatively weak fundamental force of attraction that acts between all particles that have mass. It is believed to be mediated by gravitons.
Newton’s Law of Universal Gravitation states that every particle attracts every other particle in the universe with force directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
The force of gravitational attraction is directly dependent upon the masses of both objects and inversely proportional to the square of the distance that separates their centers.
So as the mass of either object increases, the force of gravitational attraction between them also increases. If the mass of one of the objects is doubled, then the force of gravity between them is doubled. If the mass of one of the objects is tripled, then the force of gravity between them is tripled.
According to this question, Earth has the highest mass among the listed objects, hence, in accordance to the law of universal gravitation, Earth will possess the greatest gravitational pull.
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Plz help
I don't know chem that well
Can anybody can solve this PLEASE
Answer:
B has highest stability
Explanation:
as its octet is complete
plz mark brainliest if it helps
plsss helpp ASAP
BRAINLIEST
Answer:
Specific heat is defined by the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C). Water has a high specific heat capacity which we'll refer to as simply "heat capacity", meaning it takes more energy to increase the temperature of water compared to other substances.
Explanation:
Calculate the volume of oxygen that was in excess. if 150cm³ of carbon(11) oxide burns in 80cm³of oxygen according to the following equation 2CO + O2 =2CO.
If 150cm³ of carbon(11) oxide burns in 80cm³of oxygen according to the given equation the volume of oxygen that was in excess is 5.6 cm³.
From the balanced equation, we can see that 2 moles of CO react with 1 mole of O2. Therefore, we need to determine how much O2 is required to react with 150 cm³ of CO.
Let's start by calculating the number of moles of CO:
n(CO) = V(CO) / molar volume at STP
= 150 cm³ / 22.4 L/mol
= 0.006696 mol
Since the stoichiometric ratio of equation of CO to O2 is 2:1, we need half as many moles of O2 as CO. Therefore, the number of moles of O2 required is:
n(O2) = 1/2 * n(CO)
= 1/2 * 0.006696 mol
= 0.003348 mol
Now we can calculate the volume of oxygen required using the ideal gas law:
PV = nRT
Assuming the temperature and pressure are constant, we can simplify this to:
V = n(RT/P)
where V is the volume of gas in liters, n is the number of moles of gas, R is the ideal gas constant, T is the temperature in Kelvin, and P is the pressure in atmospheres.
At STP, the temperature is 273 K and the pressure is 1 atm. Therefore:
V(O2) = n(O2)(RT/P)
= 0.003348 mol * (0.0821 L·atm/mol·K * 273 K / 1 atm)
= 0.0744 L
= 74.4 cm³
So the volume of oxygen required to react with 150 cm³ of CO is 74.4 cm³. Since the initial volume of O2 was 80 cm³, the volume of O2 in excess is:
V(excess) = V(initial) - V(required)
= 80 cm³ - 74.4 cm³
= 5.6 cm³
Therefore, the volume of oxygen that was in excess is 5.6 cm³.
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In a sample of 200 atoms, 195 are atoms (97.50 % of the total atoms) with a mass of 14.00 amu and 5 atoms (2.50 % of the total atoms) with a mass of 15.00 amu. What is the average atomic mass of this sample? (Be sure to show your work!)
The average atomic mass of the sample is 14.025amu
How to calculate average atomic mass?Average atomic mass is the weighted average of the atomic masses of the naturally occurring isotopes of an element.
The average atomic mass of an isotopic element can be calculated as follows:
According to this question;
195 atoms (97.50 % of the total atoms) with a mass of 14.00 amu 5 atoms (2.50 % of the total atoms) with a mass of 15.00 amu(0.9750 × 14) + (0.025 × 15)
13.65 + 0.375 = 14.025amu
Therefore, 14.025amu is the average atomic mass of the element.
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Water has a density of 1.0 g/mL. Which of these objects will float in water
.. Object A: mass 50.Og; volume 60.8 ml. Object B: mass 65.2g ; volume
42.1 mL. Object C: mass 100.0g: volume 20.0 mL *
Answer:where did you get this
Explanation:
Calculate the sodium ion concentration when 70.0 mL of 3.0
M sodium carbonate is added to 30.0 mL of 1.0 M sodium
bicarbonate.
Answer:
4.5 M Na+
Explanation:
Multiply the molarity by the volume of the solution to get moles.
Note that there are TWO sodium ions in sodium carbonate, therefore the first-mole calculation must be multiplied by two.
Since molarity is defined as moles of ions/liters of solution, the final molarity will be the sum of the calculated moles divided by the sum of the liters of solution.
Hope this helps :)
With your partner, calculate the mass of copper(II) sulfate pentahydrate required to make 100 mL of a 0.500 mol/L aqueous solution . Include the water molecules that are hydrated to the crystals , as given in the chemical formula , in your calculation of molar mass. Show all of your calculations.
The mass of CuSO₄.5H₂O that is required to prepare 100 mL of a 0.500 mol/L aqueous solution is 84.3045g.
We know that 0.5-mol/L solution of copper(II) sulfate contains 0.5000 moles of copper(II) sulfate, the solute, for every
1 L= 10³ml of the solution.
This means that the sample of copper sulfate must contain,
= (100ml)x0.5 moles of CuSO₄/10³ml
= 0.05 moles of CuSO₄.
It should be noted that every mole of copper(II) sulfate pentahydrate contains 1 mole of anhydrous copper(II) sulfate, CuSO4, and 5 moles of water of hydration, H₂O.
This means that in order to deliver 0.05000 moles of anhydrous copper(II) sulfate to the solution, we must deliver 0.05000 moles of copper(II) sulfate pentahydrate.
In addition to the 0.05000 moles of anhydrous copper(II) sulfate, this sample will contain,
= 0.5 moles of CuSO₄.5H₂Ox 5 moles of H2O/1mole of CuSO₄.5H₂O.
= 0.25 moles of H₂O.
Therefore, the total mass of the copper(II) sulfate pentahydrate will be equal to the mass of
0.5 moles of anhydrous copper(II) sulfate and a mass of 0.25moles of water of hydration.
Then, the total mass of the copper(II) sulfate pentahydrate will be equal to the mass of
0.5000 moles of anhydrous copper(II) sulfate and the mass of 0.25 moles of water of hydration which is given by,
Mass of CuSO₄ = 0.5x159.609=79.8045g
Mass of 5 moles of H₂O =0.25x18.015 = 4.5 g.
Therefore, the total mass of the copper(II) sulfate pentahydrate that will deliver
0.5 moles of anhydrous copper(II) sulfate to your solution will be,
79.8045+4.5 = 84.3045g
Therefore, the mass of copper(II) sulfate pentahydrate required to make 100 mL of a 0.500 mol/L aqueous solution is 84.3045g
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What is the molar ratio of substances in a given chemical equation 2 hgo ---> 2 hg + o2 ?.
The molar ratio of substances in a given chemical equation is 2 HgO(s) 2 Hg (l) + O₂ (g)
2 moles of HgO/ 2moles of Hg
2 moles of HgO/ 1 mole of O2
2 moles of Hg/ 1 mole of O2
Define molar ratio.
The ratio of any two compounds' mole quantities in a balanced chemical reaction is known as the mole ratio. The chemical equation for balancing compares the ratios of the molecules required to carry out the reaction. An imbalanced equation prevents us from calculating the mole ratio.
A conversion factor known as a mole ratio connects the moles of any two chemicals involved in a chemical reaction. The coefficients of the balanced chemical equation provide the numbers in a conversion factor.
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What is not a product of modern chemistry ?
Answer:
Modern chemistry describes the composition, structure, and physical and chemical properties of substances. ... The main aim of modern chemistry is to improve the communication and conversation among the scientists, researchers, engineers, and policymakers, who are working under the area of modern chemistry
Explanation:
I hope this helps you!!
Reaction 1: 2O3(g) - 3O2(g)
Reaction 2: ? Overall reaction 2O(g) + 2NO(g) - 2NO2 + 2O3(g)
The enthalpy of the overall reaction represented above can be determined by adding the enthalpies of reactions 1 and 2. Which of the following could be reaction NO(g) + O(g) - NO2(g)
(NO)2(g) - 2NO(g)
2NO(g) + O2(g) - 2NO2(g)
2NO2(g) + O2(g) - N2O2(g) + O2(g)
The second option 2NO(g) + O2(g) - 2NO2(g) could be reaction 2 in the overall reaction 2O(g) + 2NO(g) - 2NO2 + 2O3(g).
The overall balanced equation involves the combination of two reactants to form two products. The reactants in reaction 2 must include O2 and NO, which combine to form NO2. The balanced equation for this reaction is 2NO(g) + O2(g) → 2NO2(g). This equation matches the stoichiometry of the overall reaction, and the enthalpies of reactions 1 and 2 can be added to determine the enthalpy of the overall reaction.
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