What is the molar mass for MgO?
Answers
Answer:
40.3044 g/mol
Explanation:
Related Questions
Please help. I need help with all 4
Answers
Cu+CaC03=Ca+Cu2(CO3)
Na+MgCI2=NaCi+Mg
Ca+AgCI=Ag+CaCI2
what is the correct lewis electron-dot diagram for an atom of sulfur-33
Answers
The correct Lewis electron-dot diagram for an atom of sulfur-33 would consist of the atomic symbol S surrounded by six dots, representing the valence electrons, and a filled shell representing the 17 core electrons.
To draw a Lewis electron-dot diagram for an atom of sulfur-33, we need to first determine the number of valence electrons present in the atom. Since sulfur belongs to Group 16 in the periodic table, it has 6 valence electrons. However, since we are dealing with sulfur-33, which is an isotope of sulfur with an atomic mass of 33, we also need to take into account the number of neutrons present in the nucleus.
To determine the number of neutrons, we can subtract the atomic number of sulfur (16) from the atomic mass of sulfur-33 (33). This gives us a total of 17 neutrons. Now that we know the total number of electrons in the atom (6 valence electrons + 17 core electrons), we can draw the Lewis electron-dot diagram.
The Lewis electron-dot diagram for sulfur-33 would consist of the atomic symbol S surrounded by six dots representing the six valence electrons. Since the atom has 17 core electrons, we can represent these as a filled shell around the atomic symbol.
In summary, the correct Lewis electron-dot diagram for an atom of sulfur-33 would consist of the atomic symbol S surrounded by six dots, representing the valence electrons, and a filled shell representing the 17 core electrons.
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Consider these equations:
2S (s) + 3O2 (g)→2SO3 (g), ΔH = −792 kJ
2S (s) + 2O2 (g)→2SO2 (g), ΔH = −594 kJ
2SO2 (g) + O2 (g)→2SO3 (g), ΔH =?
What is the missing ΔH?
a. −294 kJ
b. −198 kJ
c. +198 kJ
d. +294 kJ
Answers
Answer: (B) −198 kJ.
When an atom undergoes radioactive decay, it is due to A. Gravity B. Electromagnetism C. Strong nuclear D. Weak nuclear
Answers
D. Weak nuclear. When an atom undergoes radioactive decay, it is due to the weak nuclear force.
The weak nuclear force is one of the fundamental forces of nature, along with gravity, electromagnetism, and the strong nuclear force. The weak nuclear force is responsible for certain types of nuclear decay processes, such as beta decay.
In beta decay, an unstable atomic nucleus undergoes a transformation where a neutron is converted into a proton, or vice versa, within the nucleus. This process is mediated by the weak nuclear force, which allows for the transformation of one type of quark (up or down) into the other type, along with the emission of an electron (beta particle) or a positron (positron emission). The weak nuclear force is involved in processes that involve the exchange of W and Z bosons, which are the carriers of the weak force.
In contrast, gravity and electromagnetism do not play a direct role in radioactive decay. Gravity is a force that governs the interactions between objects with mass, but it is relatively weak at the atomic and subatomic scales. Electromagnetism is responsible for the interactions between charged particles, such as electrons and protons, but it does not directly cause nuclear decay.
The strong nuclear force, on the other hand, is responsible for holding the atomic nucleus together by overcoming the electrostatic repulsion between positively charged protons. It is involved in keeping the protons and neutrons tightly bound within the nucleus. However, it does not directly cause radioactive decay.
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(c) Why is fluorine an exception to the pattern of oxidation states found for the other group members?
Answers
The most electronegative element on the periodic table is fluorine. It always displays the oxidation states of 1 and 1, whereas other halogens display the oxidation states of 1, +1, +3, +5, and 7. They exhibit a high oxidation state when the d-orbital is unoccupied. However, fluorine does not exhibit a high oxidation state because it lacks a vacant d-orbital.
The chemical element fluorine has an atomic number of 9 and the symbol F. The lightest halogen, it is an extremely poisonous, pale yellow diatomic gas under normal conditions. It is exceedingly reactive and, as the most electronegative element, reacts with all other elements with the exception of argon, neon, and helium.
Since fluorine is the most electronegative element, its oxidation state always displays one. It starts out with seven valence electrons and adds one more to form an octet. Fluorine now has an oxidation state of 1. They exhibit a high oxidation state when the d-orbital is unoccupied. However, fluorine does not exhibit a high oxidation state because it lacks a vacant d-orbital.
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how to find the atomic number and atomic mass of the first 20 elements
Answers
1. Hydrogen: Atomic number = 1, Atomic mass = 1.008
2. Helium: Atomic number = 2, Atomic mass = 4.003
3. Lithium: Atomic number = 3, Atomic mass = 6.941
4. Beryllium: Atomic number = 4, Atomic mass = 9.012
5. Boron: Atomic number = 5, Atomic mass = 10.81
6. Carbon: Atomic number = 6, Atomic mass = 12.01
7. Nitrogen: Atomic number = 7, Atomic mass = 14.01
8. Oxygen: Atomic number = 8, Atomic mass = 16.00
9. Fluorine: Atomic number = 9, Atomic mass = 19.00
10. Neon: Atomic number = 10, Atomic mass = 20.18
11. Sodium: Atomic number = 11, Atomic mass = 22.99
12. Magnesium: Atomic number = 12, Atomic mass = 24.31
13. Aluminum: Atomic number = 13, Atomic mass = 26.98
14. Silicon: Atomic number = 14, Atomic mass = 28.09
15. Phosphorus: Atomic number = 15, Atomic mass = 30.97
16. Sulfur: Atomic number = 16, Atomic mass = 32.07
17. Chlorine: Atomic number = 17, Atomic mass = 35.45
18. Argon: Atomic number = 18, Atomic mass = 39.95
19. Potassium: Atomic number = 19, Atomic mass = 39.10
20. Calcium: Atomic number = 20, Atomic mass = 40.08
Note that the atomic mass is the weighted average of the masses of all the isotopes of an element, taking into account their relative abundance, while the atomic number is the number of protons in the nucleus of an atom of that element.
137 lbs = how much ounces
Answers
Answer:
2192 ounces
Explanation:
In order to find the answer to this question you need to remember that they're 16 ounces in every pound so multiplying 16 ounces by 137 will give you your answer.
\(137 lbs\)
\(1 lb = 16\)
\(16\times137 = 2192\)
= 2192 ounces
Hope this helps.
which one of the following substances will exhibit primarily dipole-dipole intermolecular forces?
CO2
XeF4
C3H8
AsF5
SO2
Answers
AsF5 and SO2 exhibit dipole-dipole intermolecular forces.
Which molecules exhibit dipole-dipole forces?The dipole-dipole intermolecular force arises due to the attraction between the positive and negative ends of polar molecules. Therefore, to determine which substance will exhibit primarily dipole-dipole intermolecular forces, we need to analyze the polarity of each molecule
CO2: Carbon dioxide is a linear molecule, and the two polar C-O bonds are in opposite directions, canceling out the polarity of the molecule. Hence, CO2 will not exhibit dipole-dipole intermolecular forces.XeF4: Xenon tetrafluoride is a symmetrical molecule with four polar Xe-F bonds, but the molecule itself is nonpolar due to the symmetric arrangement of the bonds. Therefore, XeF4 will not exhibit dipole-dipole intermolecular forces.C3H8: Propane is a nonpolar molecule with only C-H bonds. Hence, C3H8 will not exhibit dipole-dipole intermolecular forces.AsF5: Arsenic pentafluoride is a polar molecule with five polar As-F bonds. The molecule's asymmetrical shape ensures that there is a net dipole moment, making it an ideal candidate for exhibiting dipole-dipole intermolecular forces.SO2: Sulfur dioxide is a polar molecule with two polar S-O bonds. The molecule's asymmetrical shape ensures that there is a net dipole moment, making it an ideal candidate for exhibiting dipole-dipole intermolecular forces.Therefore, AsF5 and SO2 are the two substances that will exhibit primarily dipole-dipole intermolecular forces.
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Whenever a partially charged hydrogen comes near a partially charged oxygen on another atom, a _____ bond is formed.
Answers
Whenever a partially charged hydrogen comes near a partially charged oxygen on another atom, a hydrogen bond is formed.
Hydrogen bonding is a type of weak chemical bond that arises when the slightly positive hydrogen atom of a polar covalent bond in one molecule is attracted to the strongly electronegative oxygen, nitrogen, or fluorine atom of a polar covalent bond in another molecule.
A hydrogen bond is a weak bond between two molecules in which an electron-deficient hydrogen atom links covalently with an electron-rich atom, usually nitrogen, oxygen, or fluorine. A hydrogen bond is often denoted by a dotted or dashed line in chemistry.
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What set of coefficients will balance the chemical equation: _NaBr (aq) + _H3PO4 (aq) → _Na3PO4(aq) + _HBr (aq)
A. 3,1,1,3
B. 1,2,3,1
C. 3,1,3,1
D. 1,1,3,3
Answers
The Balanced chemical equation for above reaction will be :
\( \small{ \mathrm{3NaBr + H_3PO_4 \rightarrow Na_3PO_4 + 3HBr}}\)
The Coefficients will be :
\(NaBr - 3\)\(H_3PO_4 - 1\)\(Na_3PO_4 - 1\)\(HBr - 3 \)So, Correct option is :
A. 3, 1, 1, 3
_____________________________
\(\mathrm{ \#TeeNForeveR}\)
You are trying to determine how
many moles of lithium nitrate are in
256 mL of a 0.855 M solution.
How many liters is 256 mL?
Answers
Answer:
0,218 moles
Explanation:
I will first explain how many liters is 256ml, that is 0,256 l.
because the m stands for milli which is a factor of 1000 -> (256 ml / 1000 = 0,256 l)
To calculate the amount of moles you multiply the volume with the concentration. So 0,256l x 0,855M = 0,218 moles.
Answer: 0.256
Explanation:
What is the electron configuration silver, Ag? exeception
Answers
Answer
2,8,18,18,1
Explanation:
Describe 3 ways students dispose of garbage at your school
Answers
Answer:
Make Recycle Bins Easily Accessible
Ditch Single-Use Waste
Minimise Paper Waste
Designate a Drawer for Scrap Paper
Eco-Friendly Lunches
What is an ecosystem. A.It is a single plant and a single animal that live in given area B. it is a community of plants, animals and their physical surrounding. C it is the members of the same species in an area. D it is one species that lives in a given area GIVE BRANLIYST
Answers
Answer:
B. it is a community of plants,animals and there physical surrounding.
Sandwich that stays fresh for 7 years, other ‘neutraceutical’ wonders
In a laboratory outside Zurich in Switzerland, a food scientist engages in "creative appraisal" of natural food flavors. An example: a real banana having 225 natural flavor components can be duplicated with artificial alternatives using only nine ingredients.
The same company has now in store 20,000 synthetic varieties of flavor, 200 for strawberry alone. Givaudan, the Swiss firm, is the world’s biggest flavorings manufacturer and supplies one in every five artificially flavored foods in the world.
Artificial? "We prefer to call them "nature identical chemicals," says Dr. Heini Menzi, vice president for European research of Givaudan.
These days, emerging groups of professionals in some countries – food scientists they are called – are enmeshed in laboratory work. They are engaged in an awesome venture of working on "industrialized solutions" to maximize manufacturers’ profits and give more nutritional and medical benefits to consumers.
Their sustainable goal is to extend the shelf-life of food items. Manufacturers are enthusiastically pouring so much money to encourage new technologies designed to keep food fresher for a longer time. One of those already attracting interest is a ready-to-eat sandwich that will stay edible after seven years!
The technique is to expose the product to a safe level of radiation using gamma rays. Irradiation kills bacteria, like salmonella and E. coli, and also prevents vegetables from sprouting, hence augmenting an extended fresh-look appearance of the produce. The other is by pulsed electric field technology which subjects fresh foods to bursts of high-voltage electricity.
Directions. Write T if the statement is TRUE and F, if FALSE.
1. Bursts of high-voltage electricity kill bacteria such as E. coli and salmonella.
2. It is possible for food scientists to copy the flavor of natural foods.
3. The shelf-life of food refers to the price of the product indicated on the shelf
4. The other name that scientists give to artificial flavor components is nature identical chemicals.
5. Givaudan has produced 300 synthetic flavors for a real banana.
6. Bacteria like salmonella and E. coli extend the shelf-life of food.
7. Food manufacturers want to extend food freshness to serve consumers and to raise profits.
8. Pulsed electric field technology gives food a fresher look even for a long time.
9. All synthetic flavors are natural.
10. Irradiation exposes a product to an acceptable level of gamma ray radiation.
11. A banana has 200 natural food flavors.
12. A Swiss firm called Givaudan supplies the world with irradiated food.
13. Fresh foods exposed to bursts of high-voltage electricity stay fresh longer14. Food companies spend much for researches that look for ways to make food last longer.
15. Dr. Heinz Menzi is the vice president of Zurich
Answers
The validity of the statements are as follows:
1. True
2. True
3. False
4. True
5. False
6. False
7. True
8. True
9. False
10. True
11. False
12. False
13. True
14. True
15. False
Food scientists are using techniques such as irradiation and pulsed electric field technology to extend the shelf-life of food, while artificial flavors can be created to mimic the taste of natural foods, as done by Givaudan, the world's largest flavorings manufacturer.
Here are the correct responses to the statements:
1. True: Bursts of high-voltage electricity can kill bacteria such as E. coli and salmonella.
2. True: Food scientists can copy the flavor of natural foods using artificial alternatives.
3. False: The shelf-life of food refers to how long the product can be stored before it becomes unfit for consumption, not the price.
4. True: Scientists refer to artificial flavor components as "nature identical chemicals."
5. False: The statement mentions that Givaudan has produced 200 synthetic flavors for strawberry, not 300 flavors for a real banana.
6. False: Bacteria like salmonella and E. coli are harmful and can cause food spoilage, so they do not extend the shelf-life of food.
7. True: Food manufacturers aim to extend food freshness to serve consumers and increase profits.
8. True: Pulsed electric field technology can give food a fresher appearance even for an extended period.
9. False: Synthetic flavors are not inherently natural; they are artificial.
10. True: Irradiation involves exposing a product to an acceptable level of gamma ray radiation.
11. False: A real banana has 225 natural flavor components, not 200.
12. False: The Swiss firm Givaudan is the world's biggest flavorings manufacturer but does not exclusively supply irradiated food.
13. True: Fresh foods exposed to bursts of high-voltage electricity can stay fresh longer.
14. True: Food companies invest significant funds in research to find ways to prolong the shelf-life of food.
15. False: The name of the vice president mentioned is Dr. Heini Menzi, not Dr. Heinz Menzi. The location mentioned is outside Zurich, not specifically in Zurich.
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6. What happens to the energy of the transition state when a catalyst is used?
A. The energy increases.
B. The energy decreases.
C. The energy does not change.
D. The energy varies during the catalyzed reaction.
please please help. Its my only try
Answers
Answer:
D I think the answer is D for this question
Answer:
is the B
Explanation:
The point of highest energy (point of the activated complex) represents the transition state. With a catalyst, the energy required for the reaction to enter the decay state, therefore, the energy required to start the reaction also decreases.
How many formula units are present in 25.0 mol of sodium chloride
Answers
25 x 6.022 x \(10^{23}\)formula units are present in 25.0 mol of sodium chloride.
What are moles?A mole is defined as 6.02214076 × \(10^{23}\)
of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
One mole of NaCl contains 6.022 x \(10^{23}\) NaCl formula units.
25.0 mol of sodium chloride contains 25 x 6.022 x \(10^{23}\).
Hence, 25 x 6.022 x \(10^{23}\)formula units are present in 25.0 mol of sodium chloride.
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The number of formula units are present in 25.0 mol of sodium chloride is 25 x 6.022 x 10 ²³ formula units of sodium chloride.
What is formula Units ?A formula unit in chemistry is the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations.
It is the lowest whole number ratio of ions represented in an ionic compound.
Hence, The number of formula units are present in 25.0 mol of sodium chloride is 25 x 6.022 x 10 ²³ formula units of sodium chloride.
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What is the sum of the coefficients needed to balance the combustion reaction of methane?
Answers
Answer: The sum of the coefficients needed to balance the combustion reaction of methane is 6.
Explanation:
Combustion is a chemical reaction in which hydrocarbons are burnt in the presence of oxygen to give carbon dioxide and water.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The chemical equation for combustion of methane will be :
\(CH_4+2O_2\rightarrow CO_2+2H_2O\)
The coefficient foer methane is 1 , 2 for oxygen , 1 for carbon dioxide and 2 for water. The sum is 6.
Which isotope has a longer half-life? select the correct answer and explanation.
Answers
Xenon-124 isotope has a longer half life.
The duration needed for a quantity to decrease to half of its initial value is known as the half-life.One of those isotopes whose half life are longer is xenon 124, whose half-life has been calculated by experts to be 18 sextillion years due to its disintegration into tellurium 124.Half-life does not imply that atoms degrade at a constant rate. The figure simply represents the time it will take, on average, for the majority of a radioactive element to diminish itself by half.While the majority of xenon isotopes have half-lives of less than 12 days, Xenon-124 is believed to have extraordinarily long half-lives and to be fundamentally stable.These decays, which are the rarest processes ever directly recorded, have been detected in the XENON1T detector in 2019.Thus Xenon-124 has highest half life.
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You have two pieces of jewelry. One of them is supposed to be pure silver. The first piece has a mass of
20.0 g and the other piece has a mass of 44.0 g. Both pieces displace 4.0 mL of water. Silver has a density
of 10.5 g/cm³. Which piece is actually silver?
Answers
The silver piece with mass of 44.0 g is an actual silver.
What is mass?A mass can be defined as a dimensionless quantity representing the amount of matter in a particle or object. The SI unit of mass is kg.
A density is defined as the measurement of how tightly a material is packed together.
To calculate the purity of silver first we have to calculate density of both the silver.
4.0 ml = 4.0 cm3
Density of 20.0 g silver = 20.0g/4.0 cm3 = 5.0 g/ cm3
Density of 44.0 g silver = 44.0g/4.0 cm3 = 11.0 g/ cm3
Thus, the density of 44.0 g of silver is near to density of pure silver hence, 44.0 g of silver is a pure silver.
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Our current model of a chemical bond is to think of it as an electrical interaction between what two parts of an atom
Answers
Answer:
Explanation:
It involves the thinking of it as an electrical interaction between the positively charged part of an atom and the negatively charged part as well. Succinctly put, the interaction between the proton of an atom and the electron of an atom.
The relationship between these two sub atomic particles is one of the basis for many chemical bonding, and this is inclusive of all the bonds there exist. Hydrogen, Electrovalent and even Covalent bondings to mention but a few
How do the physical and chemical properties of the new substance or substances created in the chemical reaction ( the products ) compare to the properties of the elements and original chemicals ( the reactants ) that made it ?
Answers
I have 250 mL of an acid. If a friend gives me another 75 mL of the same acid, how much will I have?
Answers
Answer:325 mL of acid
Explanation:250 mL + 75 mL = 325 mL
Which water sample (A, B or local sample) was more acidic to begin with.
what is your reasoning?
Answers
Answer:
B
Explanation:
Sample B takes more drops for both P- and T-alkalinity tests to reach pH 8.3 and 4.5. So it is more acidic to begin with.
pH is equal for all three.
Now look at the drops amount
21<52<25Higher the drops lower the solubility or its less acidic.
So sample A is most acidic then local then sample B
Has anyone done this essay I need help and it’s due today
Answers
Explanation:
could you post the text? its inconvenient to go back and forth to the picture.
A mutation can cause which of the following in an organism?
1 Have no effect
2Be beneficial
3 Be harmful
6Causes a new trait
5 All of the above
Answers
Answer: 5 all of the above
Explanation:
A mutation can be a blessing or a curse. It can also have no effect on the person at all.
Hope this helps
Describe two carbon sequestering methods that could reduce the impact of deforestation
Answers
The two carbon-sequestering methods that could reduce the impact of deforestation are afforestation and agriculture.
Carbon sequestering
It is a process of capturing and storing the carbon dioxide gas of an atmosphere on a large scale.This is done to prevent adverse global climatic conditionsThe methods which can reduce the impact of deforestation are afforestation, wetlands, fertilizing ocean surfaces, agriculture, etc.Afforestation
Planting trees in the nonforest region or planting trees in the deforested region.By this more and more carbon dioxide gas will be absorbed by the tress from the atmosphere via photosynthesis and that will get involve in the carbon cycle.Help in re-establishing an ecosystem in the region and prevent soil erosion.Agriculture
Growing and planting crops which maintain carbon level of the soil, And along with absorbs carbon dioxide gas from the atmosphere. Will increase the concentration of oxygen gas in the atmosphere leading to prevent air pollution.Learn more about carbon sequestering here:
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1. what is galena chemical formula
Answers
Plss answer the question in the picture. If you actually answer I will give you brainilest!!!
Answers
Answer:
hey :)
your answer is D.
Explanation:
To find density, you must divide mass and volume.
8 divided by 4 is 2
6 divided by 6 is 0
4 divided by 2 is 2
hope i helped any :))
How many joules of heat is needed to heat 68.00 grams of aluminum foil from
55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C?
Answers
Answer:
2,325.6
Explanation:
You use the formula
Q =mco
M =mass =68
C=0.9
O=temperature increases =93-55=38
Then multiple all this 3
Q=68*0.9*38
The number of joules of heat that is needed to heat 68.00 grams of aluminum foil is 2,325.6.
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By the formula of heat
Q = mct
The mass of aluminum is 68.00
the difference in temperature is 93.00 °C - 55.00 °C = 38.00
The specific heat is 0.90 J/g
Putting the values in the equation
\(Q = mct\\\\Q = 68.00 \times 0.90 \times 38.00 = 2325.6\)
Thus, the joules of heat is 2325.6 J.
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