Explanation:
An element that gains one electron will tend to acquire a negative charge whereas an element that tend to lose an electron will acquire a positive charge.
Similarly, an element losing two electrons will acquire a 2+ charge.
For example, calcium is a group II element and has 2 valence electrons. Therefore, to attain stability it loses two electrons and thus changes into [tex]Ca^{2+}[/tex] ion.
Hence, we can conclude that an element of Group II loses two electrons in the process of a chemical combination then its ionic charge will be +2.
In a solution the solute is the substance present in the greatest amount true or false
Answer: False
Explanation:
Binary Solution is a homogeneous mixture of two components called as solute and solvent.
Solute is the component which is present in smaller proportion and is solid for solid in liquid solution and solvent is the component which is present in larger proportion and is liquid for solid in liquid solution.
For example: NaCl in water will have NaCl as solute and will be lesser in amount and water will be solvent and will be greater in amount.
Thus the statement that in a solution the solute is the substance present in the greatest amount is false.
You live 15.0 miles away from a shopping center and wish to calculate the distance in feet. There are 5280 ft in one mile
What is the formula for sodium sulfate?
a. na(so)
b. naso
c. naso
d. na(so)?
According to the vsepr theory, which shape represents the molecule, cf4?
The element chlorine is represented by the symbol ____. (Capitalization is important.)
The chemical symbol of the chlorine element is represented Cl.
What is the chemical element?A chemical element can be described as a species of atoms that have a given number of protons in their nuclei which includes a pure substance consisting only of that species.
The chemical elements cannot be further broken down into simpler substances, unlike chemical compounds, by any chemical reaction. The defining property of an element is the number of protons in the nucleus which is referred to as its atomic number.
Nearly all naturally occurring chemical elements occur on the Earth as compounds or mixtures. Air is primarily a mixture of nitrogen, oxygen, and argon, though it does contain compounds like carbon dioxide and water. A chemical symbol can bed described as a one- or two-letter designation of an element that has the first letter always capitalized.
The elements are organized in tabular form by increasing atomic numbers into rows called "periods" and into columns called "groups" that share physical and chemical properties. The modern periodic table summarizes various properties of the elements and the relationships between them.
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an ice cube and a scoop of table salt are left outside on a warm, sunny day. Explain why the ice cube melts and the salt does not
the reason why is that salt is a solid while ice is a liquid solid
or something like that but don't forget to put that it is a solid
What happens to the 6 carbon atoms of glucose when it is completely degraded?
Degradation means that a large molecule is broken down into simpler ones. In this case, glucose which has a chemical formula of C6H12O6 is broken down into simple parts.
Assuming that the reaction takes the form below, glucose is usually converted into 6 units of carbon dioxide CO2.
C6H12O6 + reactant --> 6CO2 + product
Final answer:
When glucose is completely degraded, its six carbon atoms combine with oxygen to form carbon dioxide during cellular respiration. The energy from glucose's chemical bonds is stored in energy-carrier molecules.
Explanation:
When glucose is completely degraded, all six carbon atoms combine with oxygen to form carbon dioxide. The process of glucose degradation occurs during cellular respiration, specifically through the Krebs Cycle. After two turns of the cycle, the original glucose molecule has been broken down completely, and the energy from its chemical bonds has been stored in energy-carrier molecules. In total, 16 energy-carrier molecules are produced.
Magnified we see that the carbon atom _______ in place. flashcard
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Question 1 (1 point) Question 1 Unsaved
Orbitals are defined by which of the following?
Question 1 options:
number of electrons
spin direction
energy level
composition
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Question 2 (1 point) Question 2 Unsaved
An atom has 14 protons and 14 neutrons. What is the chemical symbol for the atom? Consult the periodic table.
Question 2 options:
Al
Cr
Mg
Si
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Question 3 (1 point) Question 3 Unsaved
An atom has an average atomic mass of about 63.5 amu. What is the chemical symbol for the atom? Consult the periodic table.
Question 3 options:
Pb
Cu
Eu
Fe
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Question 4 (1 point) Question 4 Unsaved
An atom has a charge of –3 in its orbitals. Which statement must be true in order for this atom to have no net charge?
Question 4 options:
There are three neutral neutrons in the nucleus.
There are three positively charged protons in the nucleus.
There are two positively charged protons in the nucleus and one in an orbital.
There are three positively charged protons outside the nucleus.
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Question 5 (1 point) Question 5 Unsaved
The number of protons in the nucleus of an atom is equivalent to which of the following?
Question 5 options:
mass number
atomic weight
atomic number
number of neutrons
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Question 6 (1 point) Question 6 Unsaved
You heat two substances, A and B. Both substances change color. When cooled, substance A returns to its original color, but substance B does not. What most likely happened?
Question 6 options:
A chemical change occurred in both substances.
A chemical change occurred in substance A, and a physical change occurred in substance B.
A physical change occurred in both substances.
A physical change occurred in substance A, and a chemical change occurred in substance B.
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Question 7 (1 point) Question 7 Unsaved
A material has a density of 8.9 g/cm3. You have six cubic centimeters of the substance. What is the material's mass in grams?
Question 7 options:
5.9 g
107 g
3.0 g
53 g
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Question 8 (1 point) Question 8 Unsaved
Which of the following describes an element?
Question 8 options:
C2H6
H2O2
CuSO4
CI2
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Question 9 (1 point) Question 9 Unsaved
Which of the following goes on the x-axis of a graph?
Question 9 options:
trend line
independent variable values
graph title
dependent variable values
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Question 10 (1 point) Question 10 Unsaved
A container has the dimensions of 30 cm x 50 mm x 0.2 m. The density of its contents is 2.5 g/cm 3. What is the mass of the substance in kilograms? ( D = m/V)
Question 10 options:
150 kg
75 kg
0.75 kg
7.5 kg
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What is a mineral phase change?
a. when a mineral melts from a solid state to a liquid state
b. the exterior of a mineral weathers and changes color
c. a mineral changes density because of the addition of water
d. atoms in a mineral are rearranged into a more stable and denser structure?
When preparing a buret for use in lab the buret must always be cleaned thoroughly prior to being filled with solution what is burette rinsed with?
A compound consists of 4.50 g of nitrogen for every 7.71 g of oxygen and has the same empirical and molecular formula identify the compound
Answer:
[tex]N_2O_{3}[/tex]
Explanation:
Hi, the empirical formula is the minimal expression of the molecule composition and doesn't always represent the molecule in the reality.
On the other hand the molecular formula is a multiple of the empirical and represents how the molecule is composed in reality.
In this case they are the same.
Now, nitrogen has an atomic weight of 14 g/mol and oxygen one of 16 g/mol:
[tex]n_{nitrogen}=\frac{4.5g}{14g/mol}[/tex]
[tex]n_{nitrogen}= 0.321mol[/tex]
[tex]n_{oxygen}=\frac{7.715g}{16g/mol}[/tex]
[tex]n_{oxygen}= 0.482mol[/tex]
So the formula would be:
[tex]N_{0.321}O_{0.482}[/tex]
Dividing per 0.321:
[tex]NO_{1.5}[/tex]
In natural numbers:
[tex]N_2O_{3}[/tex]
The balanced equation for combustion in an acetylene torch is shown below: 2C2H2 + 5O2 → 4CO2 + 2H2O The acetylene tank contains 35.0 mol C2H2, and the oxygen tank contains 84.0 mol O2. How many moles of CO2 are produced when 35.0 mol C2H2 react completely?
Final answer:
When 35.0 mol of C2H2 react completely according to the given equation, 70.0 mol of CO2 will be produced.
Explanation:
The student asked about the amount of CO2 produced when 35.0 mol C2H2 reacts completely, according to the balanced chemical equation provided for the combustion of acetylene (C2H2) in an acetylene torch: 2C2H2 + 5O2 → 4CO2 + 2H2O.
To find the amount of CO2 produced, we apply stoichiometry using the balanced equation. According to the equation, 2 moles of C2H2 produce 4 moles of CO2. Therefore, if 35.0 mol C2H2 react completely, the amount of CO2 produced can be calculated by setting up a ratio:
(35.0 mol C2H2) × (4 mol CO2 / 2 mol C2H2) = 70.0 mol CO2
Thus, 35.0 mol of C2H2 will produce 70.0 mol of CO2 when they react completely.
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What is the resulting formula unit when strontium (Sr) and phosphorus (P) bond?
Answer: The chemical formula of the compound is [tex]Sr_3P_2[/tex]
Explanation:
Strontium is the 38th element of the periodic table. The electronic configuration of this element is [tex][Kr]5s^2[/tex]
This element will loose 2 electrons to attain stable electronic configuration to attain +2 oxidation state.
Phosphorus is the 15th element of the periodic table. The electronic configuration of this element is [tex]1s^22s^22p^63s^22p^3[/tex]
This element requires 3 electron to attain stable electronic configuration to attain -3 oxidation state.
So, by criss-cross method, the oxidation state of the ions are exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.
Hence, the chemical formula of the compound is [tex]Sr_3P_2[/tex]
How many more h+ ions does a solution with a ph of 4 than a solution with a ph of 5?
I don’t understand this, can you help me?
A nuclear waste site. cesium-137 is a particularly dangerous by-product of nuclear reactors. it has a half-life of 30 years. it can be readily absorbed into the food chain and is one of the materials that would be stored in the proposed waste site at yucca mountain (see the article opening this section). suppose we place 3000 grams of cesium-137 in a nuclear waste site.how much cesium-137 will be present after 60 years, or two half-lives?
Which subatomic particle did james chadwick discover? compare its mass to that of a proton. presi?
Which could make up a solution?
Check all that apply.
A. A gas in a liquid
B. Two gases
C. Two solids
D. A solid in a liquid
Which element has six energy levels
A 0.82 kg piece of wood floats in water but is found to sink in alcohol (sg=0.79), in which it has an apparent mass of 0.059 kg .
Human activities can accelerate the process of
A) physical weathering
B) chemical weathering
C) both
Human activities can indeed accelerate the process of both physical and chemical weathering. Option C) is the correct answer.
Explanation:Physical weathering involves the degradation of rock through physical processes, such as freeze-thaw cycles or abrasion. Chemical weathering, on the other hand, involves the decomposition of rock through chemical reactions, such as oxidation and hydration.
Human activities, such as deforestation, mining, and construction, can accelerate these processes. For instance, the removal of trees (deforestation) can lead to more intense freeze-thaw cycles, accelerating physical weathering. Mining, meanwhile, exposes more rock to air and water, facilitating chemical reactions and thus speeding up chemical weathering.
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Identify the compound with the highest standard free energy of formation. identify the compound with the highest standard free energy of formation. no(g)
The standard free energy of formation of nitric oxide (NO(g)) is 86.55 kJ/mol at 25 degrees Celsius. This refers to the energy change during the formation of one mole of the compound from its elements in their standard states. However, different compounds might have higher or lower values depending on various conditions.
Explanation:The standard free energy of formation, or ΔGo°f, refers to the change in energy that occurs when one mole of a compound is formed from its elements in their most stable states at standard conditions (1 atm and 25 °C). It is zero for elemental substances in their standard states.
Nitric oxide (NO) in its gaseous form, specifically, has a ΔGo°f of 86.55 kJ/mol at 25 °C. This value may vary based on the temperature and other conditions of the reaction.
It's important to note that even though NO(g) has a high standard free energy of formation, it doesn't imply that NO(g) is the compound with the 'highest' ΔGo°f across all compounds. The ΔGo°f of a compound would depend on the complexity of the molecule, its elemental composition, and other factors. Therefore the ΔGo°f of different compounds can be looked up in tables in chemical reference books or databases.
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A 1.25-g sample contains some of the very reactive compound Al(C6H5)3. On treating the compound with aqueous HCl, 0.951 g of C6H6 is obtained.
Al(C6H5)3(s) + 3HCl(aq) --> AlCl3(aq) + 3C6H6(l)
Assuming that Al(C6H5)3 was converted completely to products, what is the weight percent of Al(C6H5)3 in original 1.25-g sample?
By using the reaction and given data, we find that the 1.25 g sample contains approximately 83.9% Al(C₆H₅)₃.
The primary calculations involve moles and molecular weight to determine the mass percentage.
The result shows a high concentration of Al(C₆H₅)₃ in the sample.
To determine the weight percent of Al(C₆H₅)₃ in the original 1.25-g sample, we need to work step-by-step through the given reaction:
Al(C₆H₅)₃ (s) + 3HCl(aq) → AlCl₃(aq) + 3C₆H₆(l)Given that 0.951 g of benzene (C₆H₆) is produced, we can use this information to find the moles of Al(C₆H₅)₃ reacted:
Molecular weight of C₆H₆ = 12(6) + 1(6) = 78 g/mol.Moles of C₆H₆ = 0.951 g / 78 g/mol = 0.0122 mol.From the balanced equation, 1 mol of Al(C₆H₅)₃ produces 3 mol of C₆H₆.So, moles of Al(C₆H₅)₃ = 0.0122 mol / 3 = 0.00407 mol.Next, we calculate the mass of Al(C₆H₅)₃:
Molecular weight of Al(C₆H₅)₃ = 27 (Al) + 3 × (12(6) + 1(5)) (C₆H₅ each) = 27 + 3 × 77 = 258 g/mol.Mass of Al(C₆H₅)₃ = 0.00407 mol × 258 g/mol = 1.049 g.Finally, we calculate the weight percent of Al(C₆H₅)₃ in the original sample:
Weight percent = (1.049 g / 1.25 g) × 100% ≈ 83.9%Therefore, the weight percent of Al(C₆H₅)₃ in the original 1.25-g sample is approximately 83.9%.
Correct question is: A 1.25-g sample contains some of the very reactive compound Al(C₆H₅)₃ .On treating the compound with aqueous HCl, 0.951 g of C6H6 is obtained.
Al(C₆H₅)₃ (s) + 3HCl(aq) --> AlCl₃(aq) + 3C₆H₆(l)
Assuming that Al(C₆H₅)₃ was converted completely to products, what is the weight percent of Al(C₆H₅)₃ in original 1.25-g sample?
When two atoms collide, what determines whether they will react by transferring electrons or by sharing electrons?
Answer:
Explanation:
The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas.
An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.
So, a way to determine the type of bond will be knowing if the atoms are metallic or non-metallic.
A certain shade of blue has a frequency of 7.26 × 1014 Hz. What is the energy of exactly one photon of this light?
Answer:
Energy of one photon = [tex]4.81\times 10^{-19}J[/tex]
Explanation:
Frequency = [tex]7.26\times 10^{14}\ Hz[/tex]
Energy of a photon is given by:
E = hν
Where,
h = Plank's constant
ν = Frequency
h = [tex]6.626\times 10^{-34}J\ s[/tex]
ν = [tex]7.26\times 10^{14}\ Hz\ or\ 7.26\times 10^{14}\ s^{-1}[/tex]
E = hν
[tex]=(6.626\times 10^{-34}Js)\times (7.26\times 10^{14}\ s^{-1})\\=4.81\times 10^{-19}J[/tex]
Energy of one photon = [tex]4.81\times 10^{-19}J[/tex]
Final answer:
The energy of a photon of blue light with a frequency of 7.26 × 10¹⁴ Hz is approximately 4.81 × 10⁻¹⁹ joules, calculated using Planck's formula E = hf.
Explanation:
The energy of exactly one photon of light with a frequency of 7.26 × 10¹⁴ Hz can be calculated using the formula E = hf, where E is the energy in joules, h is Planck's constant (6.626 × 10⁻³⁴ J·s), and f is the frequency in hertz. Substituting the given values into the formula:
E = (6.626 × 10⁻³⁴ J·s) × (7.26 × 10¹⁴ Hz)
This results in an energy of 4.81 × 10⁻¹⁹ J per photon. Thus, a blue photon with a frequency of 7.26 × 10¹⁴ Hz has an energy of approximately 4.81 × 10⁻¹⁹ joules.
What was Johann Dobereiner's contribution to the development of the periodic table?
He identified triads of elements that had similar properties.
Why might the amount of copper produced be less than 100% of the expected amount? Check all possible reasons.
There are impurities in the substances.
The reaction might not go to completion.
The amount of one of the reactants might be measured incorrectly.
The molar ratio may not be correct.
The expected amount might be based on measurements with error.
Answer:
The answers are options 1, 2, 3, and 5.
Explanation:
Hello!
Let's solve this!
When an experiment is carried out and less product is obtained, it may be because:
There are impurities in the substances.
The reaction might not go to completion.
The amount of one of the reactants might be measured incorrectly.
The expected amount might be based on measurements with error.
We conclude that the answers are options 1, 2, 3, and 5.
Calculate the mass of 2.60 mol of CH3OH(l)
A mixture of helium, neon and argon gases have a total pressure of 790 mmhg. if there is 118.5 mmhg of argon, 474 mmhg of helium, what is the partial pressure of the neon gas?