Which statement describes the "Law of Conservation of Mass" for the following reaction?
4 Fe + 302 -
2 Fe₂O₃
Select one:
tion
a.
grams of Fe + grams of Fe2O3 = grams of O2
O b. grams of O2 + grams of Fe2O3 = grams of Fe
O c. grams of Fe +grams of O2 = grams of Fe203
O d. None of these.
Name this ionic compound.
Answer:
c
Explanation:
Describe how you would prepare a supersaturated solution
Answer:
A supersaturated solution contains more dissolved solute than required for preparing a saturated solution and can be prepared by heating a saturated solution, adding more solute, and then cooling it gently. Excess dissolved solute crystallizes by seeding supersaturated solution with a few crystals of the solute.
Explanation:
The concentration of hydronium ions is greater than 1 × 10–7 for acidic solutions. True False
The concentration of hydronium ions (H₃O⁺) is generally greater than 1 × 10⁻⁷ for all acidic solutions: True.
What is an acidic solution?An acidic solution can be defined as a type of aqeous solution that has a high concentration of hydrogen ions (H⁺), which is typically greater than that of pure water.
As a result of the fact that an acidic solution has a power of hydrogen ions (pH) below 7, the concentration of hydronium ions (H₃O⁺) derived from the protonation of water would be greater than 1 × 10⁻⁷ for all acidic solutions.
In conclusion, we can deduce that a property of all acidic solution is a concentration of hydronium ions (H₃O⁺) that is greater than 1 × 10⁻⁷.
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hii pls help me to balance chemical equation
calcium hydroxide + hydrochloric acid ------> calcium chloride + water
Answer:
1 Ca(OH)2 + 2 HCl ---> 1 CaCl2 + 2 H2O
1. Necesitas un "cubo concentrado" (de esos que se usan para sazonar las comidas Maggie, ricostilla) dos vasos de vidrio o plástico y agua (caliente y fría). 2.Agrega al vaso con agua fria la mitad de un cubo concentrado y déjala reposar unos minutos. Prepara el segundo vaso con agua caliente y agrégale la otra mitad del cubo. 3. Argumenta tus observaciones en relación con lo observado y con la teoria vista. ¿Como influye la temperatura en este experimento?
plz answer (d) explain
Cu2+ is reduced to Cu.
Change in oxidation state is from +2 to 0
Calculate the mass percent of carbon,oxygen, nitrogen and hydrogen in acetamide, C2H5NO.
Molar Mass:
O=16, N=14,C=12, H =1.
Answer:
40.68 % C
23.73 % N
8.47% H
27.12% O
Explanation:
The mass percent of an element X in a compound is calculated as the molar mass (MM) of X multiplied by the number of atoms of X in the compound, divided into the molecular weight (MW) of the compound, as follows:
mass percent of X = (MM(X) x number of atoms of X)/MW compound x 100
Thus, we first calculate the MW of acetamide (C₂H₅NO) by using the molar mass of the chemical elements C, H, N and O:
MW(C₂H₅NO) = (12 g/mol C x 2) + (1 g/mol H x 5) + 14 g/mol N + 16 g/mol O = 59 g/mol
Now, we can calculate the mass percent of each element (C, H, N, O) in C₂H₅NO:
Mass percent of C (2 atoms of C in 1 molecule of C₂H₅NO):% mass C = (12 g/mol x 2)/(59 g/mol) x 100 = 40.68 %
Mass percent of N (1 atom of N in 1 molecule of C₂H₅NO):% mass N = (14 g/mol x 1)/(59 g/mol) x 100 = 23.73 %
Mass percent of H (5 atoms of H in 1 molecule of C₂H₅NO):
% mass H = (1 g/mol x 5)/(59 g/mol) x 100 = 8.47 %
Mass percent of O (1 atom of O in 1 molecule of C₂H₅NO):
% mass O = (16 g/mol x 1)/(59 g/mol) x 100 = 27.12 %
The sum of the mass percents has to be equal to 100%:
40.68 % C + 23.73 % N + 8.47% H + 27.12% O = 100%
Jack was camping. He put a can of baked beans on his campfire, without opening the lid. The can exploded. What happened?
Answer:
Too much steam expands within the can, causing it to explode
Explanation:
Beans contain water, and when water is heated, steam is created. As the steam increases, there's less and less room for it to go. The built up pressure causes the can to explode.
Name the following compound NiBr2?
Answer:
the Name of NiBr2 is
Nickel(II) bromide
If a quantity of this substance existed as a solid at a pressure of 0.75 atm and a temperature of 50°C, what phase
change(s) would occur if the temperature increased to 500°C?
a. Freezing and deposition
b. Melting and freezing
c. Condensation and sublimation
d. Melting and vaporization
Element 'X' forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:
I) Si
2) Al
3) Mg
4) Na
pls pls answer fast
Answer:
Mg
Explanation:
Mg forms 2+ ions and mgcl2 has a melting point over 700°C I believe.
Which of the following are properties of metalloids?
A. Semi-conductors
B. All of these
C. React like metals sometimes
D. React like non-metals sometimes
Answer:
all of these are properties of metalloids
Answer:
The answer is B. All of these
Explanation:
Can you mark me the brainliest?
Which of the following are true for an element? (i)Atomic number= number of protons + number of electrons (ii)Mass number = number of protons+ number of neutrons (iii)Atomic mass= number of protons= number of neutrons (iv)Atomic number = number of protons = number of electrons
Answer:
ii and iv
Explanation:
atomic mass is the sum of protons and neutrons
protons ( postively charged) usually have the same number like electrons( negatively charged)
Consider the half reactions below for a chemical reaction.
ZnZn2+ (aq) + 2e
Cu?" (aq) + 2e → Cu(s)
What is the overall equation for this chemical reaction?
Zn(s)+ Cu?* (aq) —>Zn2+ (aq) + Cu(s)
O Zn(s) + Cu2+ (aq) — Cu2+ (aq) + 2e-
O Zn2*(aq) + Cu(s) —> Cu2* (aq) + Zn(s)
O Zn2+ (aq) + 22 —> Cu2(aq) + 2e
Answer:
Option A:
Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)
Explanation:
The half reactions given are:
Zn(s) → Zn^(2+)(aq) + 2e^(-)
Cu^(2+) (aq) + 2e^(-) → Cu(s)
From the given half reactions, we can see that in the first one, Zn undergoes oxidation to produce Zn^(2+).
While in the second half reaction, Cu^(2+) is reduced to Cu.
Thus, for the overall reaction, we will add both half reactions to get;
Zn(s) + Cu^(2+) (aq) + 2e^(-) → Cu(s) + Zn^(2+)(aq) + 2e^(-)
2e^(-) will cancel out to give us;
Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)
In the following acid-base reaction,
Cl- is the
HCI(g) + H2O(l) →H30+(aq) + Cl(aq)
acid
base
conjugate
base
Answer:
conjugate base
Explanation:
The following equation is given in this question:
HCI(g) + H2O(l) → H30+(aq) + Cl-(aq)
In accordance to Brønsted–Lowry acid–base theory, an acid is a substance that loses an hydrogen ion (H+) or proton in an aqueous solution. This theory further indicated that the substance formed after an acid loses its hydrogen ion is called a CONJUGATE BASE.
In the above equation, HCl is the acid because it loses H+ while the substance formed after the loss of H+, which is Cl- is a conjugate base.
El tipo de enlace en los compuestos: NaF , SO2 e I2 ,son respectivamente de acuerdo a sus electronegatividades que son las siguientes: Na = 0.9 F= 4.0 S= 2.6 I =2.7 F=4.0
Respuesta:
NaF: Enlace iónico
SO₂: Enlace covalente polar
I₂: Enlace covalente apolar
Explicación:
El tipo de enlace entre 2 elementos depende de la diferencia de electronegatividad.
Si ΔEN = 0, el enlace es covalente apolar.Si 0 < ΔEN ≤ 1.7 , el enlace es covalente polar.Si ΔEN > 1.7 , el enlace es covalente iónico.NaF
ΔEN = |EN(Na)-EN(F)| = |0.9-4.0| = 3.1
El enlace es iónico.
SO₂
ΔEN = |EN(S)-EN(O)| = |2.6-3.5| = 0.9
El enlace es covalente polar.
I₂
ΔEN = |EN(I)-EN(I)| = |2.7-2.7| = 0
El enlace es covalente apolar.
Why boiling point is less at hilly station?
The intermediate product formed during the production of urea is,
Answer:
Arginine is intermediate product formed during the production of urea
The key combination is ornithine, on which the urea molecule is 'created'; intermediates in the procedure contain citrulline and arginine.
What is the Production of Urea?
The urea cycle is a procedure of conversion of toxic ammonia to negligibly toxic urea. Consequences of the urea cycle are 1 molecule of urea, 2 molecules of ADP, and 1 molecule of both AMP and fumaric acid.
When Ammonia and carbon dioxide recovery During urea decomposition a mixture of gaseous carbon dioxide and also ammonia is accumulated and also immersed into a dilute aqueous urea resolution.
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Cual es la longitud de onda de un foton emitido durante la transicion desde el stado n=5 al estado n=3 en atomo Hidrogeno? Dar como respuesta de la longitud de onda en nm (nanometros)
Answer:
1302 nm
Explanation:
Del formulario de Rydberg para longitud de onda
1 / λ = R (1 / nf ^ 2 - 1 / ni ^ 2)
1 / λ = 1.097 × 10 ^ 7 (1/3 ^ 2 - 1/5 ^ 2)
1 / λ = 1.097 × 10 ^ 7 (0.11 - 0.04)
1 / λ = 1.097 × 10 ^ 7 (0.07)
= 1,302 × 10 ^ -6 m
o 1302 nm
2. Sulfur dioxide gas (SO2) reacts with excess oxygen gas (O2) and excess liquid water (H2O) to form liquid sulfuric acid (H2SO4). In the laboratory, a chemist carries out this reaction with 67.2 L of sulfur dioxide and gets 250 g of sulfuric acid.
• Write a balanced equation for the reaction.
• Calculate the theoretical yield of sulfuric acid.
• Calculate the percent yield of the reaction.
(One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)
Answer:
See explanation
Explanation:
The balanced equation for the formation of sulphuric acid is;
2SO2 + O2 + 2H2O → 2H2SO4
If 1 mole of SO2 occupies 22.4 L
x moles occupy 67.2 L
x = 1 × 67.2/22.4
x= 3 moles
From the reaction equation;
2 moles of SO2 yields 2 moles of H2SO4
Hence 3 moles of SO2 also yields 3 moles of H2SO4
Theoretical yield of H2SO4 = 3 moles × 98 g/mol = 294 g
Percent yield = actual yield/theoretical yield × 100
Percent yield = 250g/294g × 100
Percent yield = 85%
is c10H8 a conductor
Answer:
No
Explanation:
Napthalene cannot conduct electricity
PLZ HELL ME WITH MY WORK
Answer:
Ba
Explanation:
write electronic configuration of chlorine in its ionic state?
Answer:
1s2 2s2 2p6 3s2 3p6
Explanation:
Chlorine is a groups 17 element. The halogens for ions by accepting one electron to form univalent negative ions.
Since chlorine normally contains seventeen electrons, the chloride ion consists of eighteen electrons.
Hence the electronic configuration of chlorine ion is; 1s2 2s2 2p6 3s2 3p6.
what is the temperature in kelvins of 23 Celsius? hurry pls
Answer:
23°C + 273.15 = 296.15K
I HOPE ITS RIGHT IF NOT THEN SORRYHAVE A GREAT DAY :)
. Why a chlorine atom with an atomic number of 17 will be negatively charged when its valance shell gains an electron.
Explanation:
When chlorine bonds and becomes stable, (had a full outer electron shell), because we know that chlorine has 7 electrons in it’s outer shell, it requires 1 to gain noble gas structure. So, when if bonds with an element and then becomes stable, the gaining of an electron means it becomes a negatively charged ion. (an ion being a charged particle.)
Which of the following about a balanced chemical reactions is
NOT true?
O A properly written chemical equation will include the states of matter
for every substance in the reaction.
O The number of atoms of each element must be the same for both
reactants and products.
A balanced chemical equation must follow the Law of Conservation
of Matter
A balanced chemical equation must always include coefficients on
every reactant and product.
Answer:
A balanced chemical equation must always include coefficients on every reactant and product.
Explanation:
A balanced chemical equation does not need to include coefficients on every reactant and product.
For example, below is a balanced chemical equation in which the reactants and the products have no coefficients whatsoever:
NaOH(aq) + HCl (aq) -----> NaCl (s) + H2O (l)
Of course, a properly written chemical equation must include the states of matter of all the substances in the reaction and the number of atoms of each element must balance both in the reactant and product sides of the equation. Generally, a balanced chemical equation must obey the law of conservation of matter which opines that matter can neither be created nor destroyed but can only be converted from one form to another.
Hence, that a balanced chemical equation must always include coefficients on every reactant and product is not true.
Nồng độ mol của 200ml dung dịch Nacl chứa 0,5 mol chất tan là :
Answer:
Explanation:
2,5M
Answer:
2,5m
Explanation:
c=n:v
Por favor, necesito ayuda, es urgente!!!
Answer:
what type of language this is ??
Identifica las formas de energía mecánica
(cinética y potencial) que tienen lugar en diferentes puntos del movimiento en
un sistema mecánico (caída libre, montaña rusa, péndulo).
2 Tipos de Energía Mecánica
2.1 1. Energía hidráulica
2.2 2. Energía eólica
2.3 3. Energía Mareomotriz
3 Ejemplos de Energía Mecánica
3.1 1. Planta hidroeléctrica
3.2 2. Máquinas de Vapor
3.3 3. Motor de Combustión interna
3.4 4. Molinos de Viento
3.5 5. Un Juego de Billar
3.6 6. Motor eléctrico
3.7 7. Locomotora
3.8 8. Bala
3.9 9. Una pistola de Dardos
3.10 10. Pelota sobre una mesa
https://www.aura-energia.com/ejemplos-de-energia-mecanica/
An unknown compound has the following chemical formula: NxO
where x stands for a whole number.
Measurements also show that a certain sample of the unknown compound contains 5.2 mol of nitrogen and 2.65 mol of oxygen
Write the complete chemical formula for the unknown compound.
Taking into account the definition of empirical formula, the complete chemical formula for the unknown compound is N₂O.
The empirical formula of a chemical compound shows the ratio between the atoms of the compound. That is, it indicates which elements are present and the minimum ratio in whole numbers between their atoms. The empirical formula is the simplest chemical formula for a chemical compound, which is why it is also called the minimum formula.
The empirical formula must be expressed using integer relationships, then to obtain this formula, divide the numbers of moles by the smallest result of them. In this case:
Nitrogen: [tex]\frac{5.2 moles}{2.65 moles}[/tex]= 1.96 moles ≅ 2 moles
Oxygen [tex]\frac{2.65 moles}{2.65 moles}[/tex]= 1 mole
Being the chemical formula of hte compound NxO, where x stands for a whole number, this indicates that the elements N and O are in the compound in a whole number ratio of x: 1. Then, as in the empirical formula, the numbers of moles must be expressed in whole numbers, as previously calculated, the value of x must be 2.
In summary, the complete chemical formula for the unknown compound is N₂O.
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