An atom has 33 protons, 42 neutrons in its nucleus and 33 electrons in the electron cloud. What is the charge of the atom's nucleus?
Answers
Answer:
arsenic
Explanation:
Name -Arsenic
Symbol -As
Atomic Number -33
Atomic Mass -74.9216 atomic mass units
Number of Protons -33
Number of Neutrons -42
Number of Electrons -33
Trust
Related Questions
Turbo or supercharger
Answers
A 118.0 g sample of a compound contains 72.0 g of C. 18.0 g of H, and 28.0 g of N.
Which of the following is the empirical formula of the compound?
Answers
The empirical formula of the compound with 72.0 g of C. 18.0 g of H, and 28.0 g of N is C₃H₉N.
How to calculate empirical formula?Empirical formula of a compound indicates the ratios of the various elements present in a compound, without regard to the actual numbers.
The empirical formula of a compound can be calculated as follows:
C = 72.0g H = 18.0g N = 28.0gFirst, we divide by the atomic mass of each element as follows:
C = 72.0g ÷ 12 = 6molH = 18.0g ÷ 1 = 18 molN = 28.0g ÷ 14 = 2molNext, we divide by the smallest mole as follows:
C = 6mol ÷ 2 = 3
H = 18 mol ÷ 2 = 9
N = 2mol ÷ 2 = 1
The empirical ratio is 3:9:1, hence, it can be said that the empirical formula is as follows: C₃H₉N.
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if you wished to dissolve 10g of sucrose sugar in 1l of h2o, which actions would be helpful? heat stirring heat and stirring neither heat nor stirring
Answers
Stirring is only required to dissolve sucrose sugar in water.
What is solubility?
Solubility in chemistry refers to a chemical's capacity to dissolve in another substance, the solvent, to produce a solution. The opposite characteristic, insolubility, refers to the solute's incapacity to create a solution. The solvent is often a solid or a liquid, whereas the solute may be a solid, liquid, or gas. Both could be solution-based compounds or pure chemicals. Except in extremely rare circumstances, gases are always miscible in all ratios, and the only way a solid or liquid may be "dissolved" in a gas is by first becoming gaseous.
Temperature, pressure, and the makeup of the solute and solvent (including their pH and the presence of additional dissolved materials) are the key determinants of solubility.
Sugar dissolves in water because energy is given off when the slightly polar sucrose molecules form intermolecular bonds with the polar water molecules. The weak bonds that form between the solute and the solvent compensate for the energy needed to disrupt the structure of both the pure solute and the solvent.Hence, stirring is only required to dissolve sucrose sugar in water.
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Extra points please someone help
Answers
Answer: Plants and animals share many characteristics, but they are different in some respects hope that helps-
Explanation:
Reforestation projects, where only one species is planted in an area, result in..
1. the likelihood of an unsustainable ecosystems.
2. limited biodiversity.
3. a population at increased risk of disease or insect invasion.
4. all of the above
Multiple choice
Answers
Oxygen gas is collected over water. The atmospheric pressure is 748 mmHg, and the temperature of the oxygen is 29 ºC. The pressure of evaporating water at that temperature is 30.0 mmHg. What is the pressure of the oxygen gas collected?
Answers
The pressure of the oxygen gas collected : 718 mmHg
Further explanationGiven
P tot = 748 mmHg
P water vapour = 30 mmHg
Required
P Oxygen
Solution
Dalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
The partial pressure is the pressure of each gas in a mixture
P tot = P H₂O + P Oxygen
P Oxygen = 748 mmHg - 30 mmHg
P Oxygen = 718 mmHg
A heat sensing resistor that changes its value as its temperature changes is known as a:_____.
Answers
A heat sensing resistor that changes its value as its temperature changes is known as a Thermistor.
The Thermistor is a special type of variable resistive detail that adjustments its physical resistance while uncovered to modifications in temperature. The Thermistor is a solid kingdom temperature sensing device which acts a chunk like an electrical resistor however is temperature touchy. A thermistor is a temperature sensitive resistor. they may be regularly used as a temperature sensor.
Thermocouples are the maximum generally used form of temperature sensor. they are used in business, automotive, and purchaser programs. Thermocouples are self-powered, require no excitation, can function over a extensive temperature variety, and feature brief response times.
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.Calculate the energy released in joules/mol when one mole of polonium-214 decays according to the equation
21484 Po --> 21082 Pb + 42 He
Atomic masses: Pb-210 = 209.98284 amu,
Po-214 = 213.99519 amu, He-4 = 4.00260 amu.]
Question 8 options:
8.78 x 1014 J/mol
7.2 x 1014 J/mol
8.78 x 1011 J/mol
–9.75 x 10–3 J/mol
1.46 x 10–9 J/mol
Answers
To calculate the energy released in joules/mol when one mole of polonium-214 decays, first determine the mass difference between reactants and products: So the energy released when one mole of polonium-214 decays is 8.78 x 10¹⁴ J/mol.
To calculate the energy released in joules/mol when one mole of polonium-214 decays according to the given equation, we need to first determine the atomic mass difference between the reactants and products.
The atomic mass of 214Po is 213.99519 amu, while the combined atomic masses of 210Pb and 4He are 209.98284 amu + 4.00260 amu = 213.98544 amu.
Thus, the atomic mass difference is 213.99519 amu - 213.98544 amu = 0.00975 amu.
Using the relationship E=mc^2, we can calculate the energy released by the decay of one mole of 214Po as:
E = (0.00975 amu/mol) * (1.66054 x 10^-27 kg/amu) * (2.99792 x 10^8 m/s)^2 = 8.78 x 10^14 J/mol.
Therefore, the correct answer is 8.78 x 10^14 J/mol.
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Sodium metal is reacted with chlorine gas to produce 5.85g of a salt.
a. Find the mass of the reacted metal
b. Fid the volume of the reacted gas at STP.
(Na=23, C1=35.5, at STP: 1mole of gas has 22.4L
Answers
Answer:
35.5 this is the answer ok
Answer:
A= 2.3g
B= 1.2L
Explanation:
a) Find the mass of the reacted metal
2Na + Cl2 → 2NaCl
46 71 117
X 5.85
From the chemical equation
117/5.85 = 46/x
X= (46x5.85)/117
= 2.3g
So, the mass of the reacted metal is 2.3g
b) Find the volume of the reacted gas at STP
at STP: 71g of CL2 has 22.4l
Y of Cl2 has V
V= (Y x 22.4L) / 71 where y=?
From the chemical equation
117 / 5.85 = 71 / Y
Y= (71x5.85) / 117
= 3.55
V= (3.55x22.4) / 71
= 1.12L
So, the volume of the reacted gas at STP is 1.12L
The two basic properties of all matter are ______ and ______.
options for first blank
a. length B. volume
options for second blank
a. density B. mass
Answers
Answer:A-density and B-mass is the answer.
Explanation:
Answer:
1.) Density
2.) Mass
Explanation:
A change that produces a new substance is a _______ change
Answers
Answer is chemical change
a chemical change, also known as a chemical reaction, is a process in which one or more substances are altered into one or more new and different substances. in other words, a chemical change is a chemical reaction involving the rearrangement of atoms.
The name for a positive ion is a ....
Answers
The name for a positive ion is a cation.
hope this helped
if an unknown sample solution is prepared by diluting 10.00 ml of the original solution to a total volume of 100.0 ml with deionized water, what is the dilution factor?
Answers
The dilution factor of the unknown sample is 10. The dilution factor of a solution refers to the ratio of the final volume of the now diluted solution to the initial volume of the of the initial concentrated solution.
Mathematically;
The dilution factor is given by the formula;
Dilution factor = Final volume of the now diluted solution/ Initial volume of more concentrated solution
Final volume of the now diluted solution = 100.0 ml
Initial volume of more concentrated solution = 10.00 ml
Dilution factor = 100.0 ml/10.00 ml
Dilution factor = 10
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what kind of control is bonding? question 1 options: primarily preventive primarily detective primarily corrective primarily detective and corrective
Answers
Bonding is primarily a preventive control. It is a process of obtaining insurance or a surety bond that provides financial protection to the organization against losses caused by the fraudulent or unethical actions of its employees. Bonding helps to reduce the risk of loss by providing a financial disincentive for employees to engage in such actions.
Additionally, bonding helps to build trust with customers and other stakeholders by demonstrating that the organization is committed to preventing and detecting fraudulent or unethical behavior. While bonding may also have some elements of detective and corrective control, its primary purpose is to prevent losses before they occur. Overall, bonding is an important tool for organizations to mitigate the risk of employee misconduct and protect their financial interests.
Bonding is primarily preventive control. It involves creating a strong connection between individuals or groups to establish trust, cooperation, and support, which helps prevent potential conflicts, misunderstandings, or undesirable behavior. By promoting positive relationships and open communication, bonding serves as a proactive measure to maintain harmony and productivity in various environments, such as workplaces or social groups.
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The number of joules required to heat one gram of a substance one degree Celsius is _____.
endothermic
temperature
exothermic
specific heat capacity
Answers
The balanced molecular equation for complete neutralization of H2SO4 by KOH in aqueous solution is
A) 2H+ (aq) + 2OH- (aq) → 2H2O (l)
B) 2H+ (aq) + 2KOH (aq) → 2H2O (l) + 2K+ (aq)
C) H2SO4 (aq) + 2OH- (aq) → 2H2O (l) + SO42- (aq)
D) H2SO4 (aq) + 2KOH (aq) → 2H2O (l) + K2SO4 (s)
E) H2SO4 (aq) + 2KOH (aq) → 2H2O (l) + K2SO4 (aq)
Answers
The balanced molecular equation for complete neutralization of H2SO4 by KOH in aqueous solution is :
E: H2SO4 (aq) + 2KOH (aq) → 2H2O (l) + K2SO4 (aq).
This is because neutralization is a chemical reaction between an acid and a base, which produces a salt and water.
In a reaction with water, neutralization leaves the solution with too many hydrogen or hydroxide ions. The amount of acid or base present in the neutralized solution determines its pH.
A strong acid and a strong base together will result in a neutral salt. When a strong acid and a weak base are combined, acid is created. Similar to this, when a weak acid is combined with a strong acid, a basic salt is created. There are numerous applications for neutralization.
In this case, H2SO4 is the acid and KOH is the base, and when they react in aqueous solution, they produce K2SO4 (salt) and H2O (water).
The balanced molecular equation represents the chemical reaction in terms of the molecular formulae of the reactants and products involved.
Thus, the correct option is : (E).
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PLEASE HELP OFFERING EXTRA POINT IF YOU HELP!
In the simplest compound of magnesium and oxygen, the mass of Mg is ~1.5x as great as that of O. The mass of Fe in the simplest oxide of iron was ~3.5x as great as that of oxygen. Use these ratios to determine the molar masses of Mg and Fe. Compare the values you obtained with the accepted molar masses of these elements. Can you account for any differences?
Answers
To determine the molar masses of Mg and Fe, we can use the ratios given in the problem.
Let the mass of oxygen be x. Then, the mass of magnesium in the simplest compound of magnesium and oxygen is approximately 1.5x. This means that the total mass of the compound is approximately 2.5x (since there is only one oxygen atom in the compound). The molar mass of Mg is then:
Molar mass of Mg = (2.5x) / n
where n is the number of moles of Mg in the compound. Since there is only one Mg atom in the compound, n = 1. Therefore:
Molar mass of Mg = 2.5x
Similarly, let the mass of oxygen be y. Then, the mass of iron in the simplest oxide of iron is approximately 3.5y. This means that the total mass of the oxide is approximately 4.5y (since there is only one oxygen atom in the oxide). The molar mass of Fe is then:
Molar mass of Fe = (4.5y) / m
where m is the number of moles of Fe in the oxide. Since there is only one Fe atom in the oxide, m = 1. Therefore:
Molar mass of Fe = 4.5y
To compare these values with the accepted molar masses of Mg and Fe, we can look up their values in the periodic table. The accepted molar mass of Mg is 24.31 g/mol, and the accepted molar mass of Fe is 55.85 g/mol.
Using the ratios given in the problem, we have:
Molar mass of Mg = 2.5x
Molar mass of Fe = 4.5y
We don't have any information about the values of x and y, so we can't directly compare these expressions with the accepted molar masses of Mg and Fe. However, we can make some observations based on the ratios given in the problem.
The ratio of the molar mass of Mg to the accepted molar mass of Mg is:
(Molar mass of Mg) / (Accepted molar mass of Mg) = (2.5x) / 24.31
The ratio of the molar mass of Fe to the accepted molar mass of Fe is:
(Molar mass of Fe) / (Accepted molar mass of Fe) = (4.5y) / 55.85
We can simplify these expressions by finding the values of x and y in terms of the molar masses of Mg and Fe:
x = (24.31 / 2.5) * (Molar mass of Mg)
y = (55.85 / 4.5) * (Molar mass of Fe)
Substituting these values into the expressions above, we get:
(Molar mass of Mg) / (Accepted molar mass of Mg) = 0.1027 * (Molar mass of Mg)
(Molar mass of Fe) / (Accepted molar mass of Fe) = 0.2505 * (Molar mass of Fe)
From these expressions, we can see that the ratio of the molar mass of Mg to the accepted molar mass of Mg is proportional to the molar mass of Mg, and the same is true for Fe. This means that the values we obtained for the molar masses of Mg and Fe are simply scaled versions of the accepted molar masses, with scaling factors of approximately 0.1027 and 0.2505, respectively.
The reason for these scaling factors is that the ratios given in the problem are only approximate.
How many moles are in 98.3 grams of NaF?
Answers
Answer:
1 mole is equal to 6.022x10²³
Answer:
2.979 mol
Explanation:
mass of NaF=14+19
=33g
33g of NaF is the mass of 1 mol
98.3g of NaF is the mass of (98.3/33)*1=2.979 mol
Calcium carbonate, CaCO3(s), decomposes upon heating to give CaO(s) and CO2(g). A sample of CaCO3 is decomposed, and carbon dioxide is collected in a 250 mL flask. After decomposition is complete, the gas has a pressure of 1.3 atm at a temperature of 31 degrees Celsius. How many moles of CO2 gas were generated?
Answers
The moles of CO₂ gas was generated at 0.01302 mol.
The Ideal Gas Law equation can be used for calculating the moles.
PV = nRT
n = PV/RT
Where:
P = pressure = 1.3 atm
V = volume = 250 mL = 0.25 L
n = number of moles of CO₂ gas
R = ideal gas constant = 0.0821 L·atm/mol·K
T = temperature in Kelvin = (31 + 273) K = 304 K
Substituting the values in the above equation.
n = (1.3 atm)(0.25 L) / (0.0821 L·atm/mol·K)(304 K)
n = 0.01302 mol CO₂ gas
Therefore, 0.0152 moles of CO₂ gas were generated.
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Which of the following Periodic Table trends (characteristics) is incorrect?
a) electron affinity decreases from top to bottom on the periodic table
b) electronegativity decreases left to right across the periodic table
c) atomic radii decreases left to right across the periodic table
d) ionization energy decreases from top to bottom on the periodic table
Answers
(b) electronegativity decreases left to right across the periodic table
Electronegativity increases from left to right in a period across the periodic table.
Electronegativity is a relative property that defines the tendency to attract shared pair of electrons. It is a unitless parameter that is calculated by different formulae.
Pauling scale is widely used to calculate the electronegativity values of a covalent bond. e.g. F = 4.0, Cl = 3.0, etc.
⇒Electron affinity decreases from top to bottom in the periodic table.
⇒Atomic radii decrease from left to right in the periodic table.
⇒Ionization energy decreases from top to bottom in the periodic table.
How many grams of AgCl are produced from 10.0 g AgNO3?
Answers
Answer:
Equation of Reaction = AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq)
Steps:
1. Find the moles of AgNO3 with formula n= Mass/Mr (molecular mass)
so you will get moles= 10.0/ 169.87 = 0.05886854654
2. Using stoichiometry you know the equation has 1 mole so the moles of AgCl are gonna be the same; therefore, you will use again the same formula.
3. moles= mass/molecular mass
0.05886854654 = x/ 143.32
You rearrange the formula to find the mass
so mass = moles x molecular mass
mass = 0.05886854654 x 143.32
mass= 8.44 grams
Explanation:
Write a balanced formula equation, complete ionic equation and net ionic equation for each of the following reactions
Answers
Answer: a)Complete ionic equation:
2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS
Net ionic equation:
Fe²⁺ + S²⁻ → FeS
b) Complete ionic equation:
2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃
Net ionic equation:
SO₃²⁻ + Ca²⁺ → CaSO₃
c) Complete ionic equation:
Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄
Net ionic equation:
Ba²⁺ + SO₄²⁻ → BaSO₄
Explanation:
(a) Balanced formula equation:
(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS
Complete ionic equation:
2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS
Net ionic equation:
Fe²⁺ + S²⁻ → FeS
(b) Balanced formula equation:
Na₂SO₃ + CaCl₂ → NaCl + CaSO₃
Complete ionic equation:
2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃
Net ionic equation:
SO₃²⁻ + Ca²⁺ → CaSO₃
(c) Balanced formula equation:
CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄
Complete ionic equation:
Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄
Net ionic equation:
Ba²⁺ + SO₄²⁻ → BaSO₄
I need some help with #2 pls
Answers
The gram-formula mass of the product in the given reaction is 201.8g.
How to calculate gram-formula?Gram Formula mass is the atomic mass of one mole of an element or a molecular compound, or an ionic compound.
To calculate the gram formula mass of a compound, the following applies;
count the number of atoms/ions of each element that is present in one formula unit. Multiply the atomic mass of each element by the total number of atoms/ions of that element present in the formulaAdd all of the masses to obtain the gram formula mass for the compoundAccording to this question, propene reacts with bromine to produce bromo propane with the molecular formula; C₃H₆Br₂.
Gram formula mass = 12(3) + 1(6) + 79.9(2) = 201.8g
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Is there any way to memorize the periodic table of elements in one night with the ionic charges and atomic mass, because if not I'm going to fail this test. This isn't such of a question, I just need some tips or encouraging word.
Answers
Answer:
Maybe try to memorize it by the valence electrons. You can do this!!
Element 115 was first created in Russia in 2003, but the International Union of Pure and Applied Chemistry didn’t announce it as a new element until it was created again in Germany in 2013. Suggest why the IUPAC requires an independent confirmation of the discovery of an element.
Answers
Answer:
moscovium
Explanation:
The IUPAC requires an independent confirmation of the discovery of an element because with the help of IUPAC name we can easily determine the chemical name of the elements.
What is IUPAC name?IUPAC name is defined as a nomenclature based on designating the longest single-bond-connected chain of carbons in a molecule, whether it is a continuous chain or a ring. The official naming guidelines are used to give organic compounds a standardized name known as the IUPAC nomenclature. Contrarily, common names are older, unofficial names given to organic compounds; yet, they are occasionally employed.
The names' suffixes reflect and uphold historical and chemical consistency as well: "-ium" for elements 113 and 115, as well as for all newly discovered elements in groups 1 to 16, "-ine" for element 117, which belongs to group 17, and "-on" for element 118, which is a member of group 18. The half-life of the most stable isotope of Moscovium, Moscovium-289, is around 220 milliseconds.
Thus, the IUPAC requires an independent confirmation of the discovery of an element because with the help of IUPAC name we can easily determine the chemical name of the elements.
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What can form along faults when pushed together or pulled apart?
O Mountains
O Volcanoes
O Both
Answers
Answer:
Both
Explanation:
if you pull a mountain a part that would be great consequences and if a volcano breaks there will be fire .
What best describes the temperature at which a solid turns into a liquid
O Melting point
O Boiling point
Electrical conductivity
Thermal conductivity
Answers
How many moles of S would I have if I had 11 grams? (Stoichiometry) HELP
Answers
0.34 mol S
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
11 g S
Step 2: Identify Conversions
[PT] Molar Mass of S - 32.07 g/mol
Step 3: Convert
Set up: \(\displaystyle 11 \ g \ S(\frac{1 \ mol \ S}{32.07 \ g \ S})\)Multiply/Divide: \(\displaystyle 0.343 \ mol \ S\)Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
0.343 mol S ≈ 0.34 mol S
t/f do not use oil-based products (vaseline, body lotions) because they destroy latex
Answers
True. Do not use oil-based products such as Vaseline and body lotions because they destroy latex. Latex is a natural rubber, and when it comes into contact with oil-based products, it reacts chemically.
This reaction causes latex to degrade and lose its elasticity, making it prone to breakage. Therefore, it is important to avoid oil-based products when using latex products, such as condoms, gloves, and other medical supplies. Instead, use water-based products that are safe to use with latex. Water-based products are gentle on the skin and do not react chemically with latex, making them ideal for use with latex products.
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what is the difference between melting point and boiling point?
Answers
The melting point is the temperature a substance must reach to go into its liquid phase (or solid) and a boiling point is the temperature a substance must reach to go into its gas phase (or liquid). For example, water must be 0ºC to melt or freeze and 100ºC to boil.