Answer:
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Magnesium is an active metal; it burns in the form of powder, ribbons, and filaments to
provide flashes of brilliant light. Why is it possible to use magnesium in construction?
Explanation:
magnesium can be used for the construction as only when the metal is divided into fine pieces or as a thin sheet, magnesium will burn rapidy.
The combustion of propane C,H, produces carbon dioxide and steam.
CH,(8) + 50,(8) — 3C0,(8) + 4H2O(1)
How many moles of CO2 are produced when 7.5 mol of propane are burned in an excess of oxygen?
A. 15 mol
B. 23 mol
C. 3.8 mol
D. 2.5 mol
Answer:
23 moles
Explanation:
Given data:
number of moles of propane = 7.5 mol
Number of moles of carbon dioxide produced = ?
Solution:
Chemical equation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Now we will compare the moles of propane and carbon dioxide.
C₃H₈ : CO₂
1 : 3
7.5 : 3/1×7.5 = 22.5
22.5≅ 23 moles
HC1O4 + P4010 ->
H3PO4 + Cl₂O7
How do I balance it?
Answer: watch Video of HC1O4 + P4010 -> H3PO4 + Cl₂o7 How Do I Balance It?
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Explanation: video is called How to Balance HClO4 P4O10 = H3PO4 Cl2O7 (Perchloric acid Phosphorus pentoxide)
Play How to Balance HClO4 P4O10 = H3PO4 Cl2O7 (Perchloric acid Phosphorus pentoxide)
2:22 minute video
How to Balance HClO4 P4O10 = H3PO4 Cl2O7 (Perchloric acid Phosphorus pentoxide)
Xenon tetrafluoride has two sets of lone pairs of electrons. What should be the relative positions of the two sets of lone pairs?Why?
Answer: Two equatorial positions so as to minimize the repulsion.
Explanation:
Formula used for calculating number of electrons :
[tex]\frac{1}{2}[V+N-C+A][/tex]
where,
V = number of valence electrons present in central atom = 8
N = number of monovalent atoms bonded to central atom = 4
C = charge of cation = 0
A = charge of anion = 0
Now we have to determine the hybridization of the [tex]XeF_4[/tex] molecule.
[tex]\frac{1}{2}[8+4-0+0]=6[/tex]
Bond pair electrons = 4
Lone pair electrons = 2
The number of electrons are 6 that means the hybridization will be [tex]sp^3d^2[/tex] and the electronic geometry of the molecule will be octahedral.
The molecular geometry will be square planar as two alternate positio ns will be occupied by lone pair of electrons so as to minimize the repulsion.
Carbon dioxide contains 1,204 ⋅ 10 ²² oxygen atoms. What is the mass of carbon dioxide?
Answer:
879.5616802
Explanation:
(N/Na)*W
What amount of the excess reagent remains when 0.30 mol NH3 reacts with 0.40 mol O2 to produce NO and H2O? 4NH3 +502 + 4NO + 6H20
(A) 0.10 mol NH,
(B) 0.10 mol
(C) 0.025 mol NH
(D) 0.025 mol O2
Answer: (D) 0.025 mol [tex]O_2[/tex]
Explanation:
The given balanced equation is :
[tex]4NH_3+5O_2\rightarrow 4NO+6H_2O[/tex]
According to stoichiometry :
4 moles of ammonia [tex](NH_3)[/tex] reacts with = 5 moles of oxygen [tex](O_2)[/tex]
Thus 0.30 moles of ammonia [tex](NH_3)[/tex] reacts with = [tex]\frac{5}{4}\times 0.30=0.375[/tex] moles of oxygen [tex](O_2)[/tex]
Now as given moles of oxygen are more than the required amount, oxygen is the excess reagent.
moles of oxygen [tex](O_2)[/tex] left = 0.40 - 0.375 = 0.025
Thus 0.025 mol [tex]O_2[/tex] excess reagent remains.
The amount of excess reagent remaining when 0.30 mole NH3 reacts with 0.40 mole O2 is 0.025 mole of O2
An excess reagent is a reactant which is left and can keep reacting after whole reaction.
A limiting reagent is a reactant that is totally consumed in the whole process of the reaction.
The chemical equation for the reaction is represented as:
[tex]\mathbf{4NH_3 + 5O_2 \to 4NO + 6H_2O}[/tex]
From the above reaction,
4 moles of ammonia reacts with 5 moles of oxygen molecule;
If 0.30 moles of ammonia reacts, then the numbers of moles of oxygen required can be computed as:
[tex]\mathbf{= \dfrac{0.3 \times 5}{4}}[/tex]
= 0.375 moles of oxygen.
But, we are given that 0.40 moles of oxygen is present.
Therefore, the amount of oxygen in excess is
= 0.40 moles - 0.375 moles
= 0.025 moles of O2
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Selenic acid (H2SeO4) forms when solid selenium dioxide reacts with gaseous oxygen and liquid water to form aqueous selenic acid.
Part A
Enter a balanced chemical equation for this reaction.
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer: 2SeO2(s)+O2(g)+2H2O(l)→2H2SeO4(aq)
Explanation:
Start with the unbalanced equation by writing chemical formulas for each of the reactants and products:
SeO2(s)+O2(g)+H2O(l)→H2SeO4(aq)
Count the number of each atom on each side of the equation to determine whether the equation is balanced:
Reactants: 1 Se atom, 5 O atoms, 2 H atoms
Products: 1 Se atom, 4 O atoms, 2 H atoms
Balance the number of oxygen atoms by adding a coefficient of 2 to aqueous selenic acid on the products' side of the reaction. Then, balance the hydrogen atoms by adding a coefficient of 2 to liquid water on the reactants' side of the reaction. Finally, balance the selenium atoms by adding a coefficient of 2 to solid selenium dioxide on the reactants' side of the reaction to give the following balanced equation:
2SeO2(s)+O2(g)+2H2O(l)→2H2SeO4(aq)
The balanced chemical equation for this reaction is
[tex]\rm2SeO_2(s) + O_2(g) + 2H_2O(l) \rightarrow 2H_2SeO_4 (aq)[/tex]
What are balanced chemical equation?A balanced chemical equation is defined as a chemical reaction in which the number of atoms of each elements in the reaction and the total charge is same for both the reactants and the products.
It involves the addition of stoichiometric coefficients of the reactants and products.
Selenic acid is majorly used in protecting and changing the color of steel, especially the steel parts on firearms.
Thus, the balanced chemical equation for this reaction is
[tex]\rm2SeO_2(s) + O_2(g) + 2H_2O(l) \rightarrow 2H_2SeO_4 (aq)[/tex]
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What nuclide undergoes fission to form molybdenum-103, atomic number 42, tin-131, atomic number 50, and two neutrons?
Element symbol: _______ mass number: _______
Answer:
The correct answer is Pu, 234.
Explanation:
In the given case, let us consider the reactant as X. Now the mass number (balanced) on both the sides will be,
Mass of X = Mass of Molybdenum + Mass of Tin + Mass of neutrons
M = 1 * 103 + 1 * 131 + 2 * 0
M = 234
Now the atomic number (balanced) on both the sides,
Atomic number of X = Atomic number of Molybdenum + Atomic number of Tin + Atomic number of neutrons
A = 1*42 + 1*50 + 2*1
A = 94
The atomic number 94 is for the element Plutonium, whose symbol is Pu. Thus, the reactant is 234-Pu.
. KMnO4 oxidizes ethyl benzene to benzoic acid. If this reaction generally results in a 40 % experimental yield, how many grams of ethyl benzene are required to obtain 244 g of benzoic acid
Answer:
530.835 g
Explanation:
First we convert 244 g of benzoic acid (C₇H₆O₂) to moles, using its molar mass:
244 g benzoic acid ÷ 122.12 g/mol = 2.00 moles benzoic acidTheoretically, one mol of ethyl benzene would produce one mol of benzoic acid. But the experimental yield tells us that one mol of ethyl benzene will produce only 0.4 moles of benzoic acid.
With the above information in mind we convert 2.00 moles of benzoic acid into moles of ethyl benzene:
2.00 moles benzoic acid * [tex]\frac{1molEthylBenzene}{0.4molBenzoicAcid}[/tex] = 5.00 moles ethyl benzeneFinally we convert moles of ethyl benzene (C₈H₁₀) into grams, using its molar mass:
5.00 moles ethyl benzene * 106.167 g/mol = 530.835 g ethyl benzenewhat is the combined gas law equation
Answer:
\frac {P_{1}V_{1}}{T_{1}}=\frac {P_{2}V_{2}}{T_{2}}
Explanation:
Gay-Lussac's law states that at constant volume, the pressure of a gas is directly proportional to the absolute temperature, P ∝ T at constant V. These three gas laws can be combined into a so-called combined gas law, P 1 V 1 T 1 = P 2 V 2 T 2.
calculate the pH of 5.9x10^-4
Answer:
The answer is 59
Explanation:
In Act IV of Romeo and Juliet, how do the Musicians feel about Peter?A. They are scared of him.
B. They find him annoying.
C. They think he is funny.
D. They feel sorry for him.
1. Sketch a periodic table by labeling the s, p, d and f blocks?
s block - group 1 and 2 , p block - group 13 to 18 , d block - group 3 to 12, f block - group 3
The s-block in the periodic table of elements occupies the alkali metals and alkaline earth metals ,thus known as groups 1 and 2.D block elements are also known as Transition elementsF block elements are divided into two series as lanthanoids and actinoids. This block of elements are referred to as inner transition metals. s and p block elements are together known as representative elementsThus we can conclude that ,they are names as s,p,d and f blocks because the last electrons enter s, p , d and f orbitals respectively.
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How does the potential energy of a double bond (like oxygen-oxygen) compare to a weak interaction or single bond (like argon-oxygen)?
Answer:
Potential energy in a double bond is going to be higher than the potential energy of a single bond due to the force needed to break a double bond as opposed to a single. Single bond is weaker, which means less energy is needed to break it. Double bonds are stronger, requiring more energy to break the bond.
Explanation:
Can sum1 Help please...
Answer:
B
Explanation:
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An atom does not have to have equal numbers of protons and _________________ in the nucleus.
Answer:
the answer is neurtons
Explanation:
How are bat forelimbs different from other mammals’ forelimbs?
Answer:
The forelimbs of a bat are different from other mammals as they are modified into wings for the purpose of flying.
Round the following number to the nearest hundredth: 4.482?
Answer: 4.48
Explanation: If the last digit in the fractional part of 4.482 is less than 5, then simply remove the last the digit of the fractional part.
Type the following formulas in the boxes in order of increasing boiling point: RbF, CO2, CH3OH, CH3Br.
Answer:
CO2 < CH3Br < CH3OH < RbF
Explanation:
The boiling point of the compounds can be determined in terms of the strength of the intermolecular forces present in each compound.
Intermolecular forces are weak forces joining non-polar and polar molecules together. We have London dispersion forces, dipole-dipole forces of attraction, and hydrogen bonding.
London dispersion forces are weak attractions found between non-polar and polar symmetrical molecules. They are the weakest of all the electrical forces and they act between atoms and molecules e.g CO2
The dipole-dipole attractions are forces of attraction existing between polar unsymmetrical molecules. The dipole-dipole force of attractions is much stronger than London dispersion forces but weaker than Hydrogen bonding. e.g CH3Br
Hydrogen bonding is a special dipole-dipole attraction between polar molecules in which a hydrogen atom is directly joined to a highly electronegative atom (e.g. oxygen, nitrogen, or fluorine). Here, the bond in CH3OH is a hydrogen bond.
Ionic bonding is a bond that is formed between two kinds of atoms having a large electronegative difference such as in RbF,
Thus, in increasing order of boiling point;
CO2 < CH3Br < CH3OH < RbF
The adult dosage of diphenhydramine, an antihistamine, is 50.0 mg. A 24 lb child should only receive 20.0% of the adult dose. Calculate this dose in milligrams.
The amount that the child should receive is 10 mg.
What is a dose?The term dose refers to the amount of drugs that a person should take. The dose of the drug is in proportion to the magnitude of the illness. The more severe the symptoms, the higher the dosage.
Since the child is to receive only 20% of the adult dose, we have;
20/100 * 50.0 mg
= 10 mg
The amount that the child should receive is 10 mg.
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What indicator of a chemical reaction could be measured using a thermometer?
Answer:
heat production
Explanation:
What is one property for each of the chemical substances listed above?
1. Acetic acid-
2. Sodium bicarbonate-
3. Carbon dioxide-
4.Dihydrogen monoxide-
5. Sodium acetate-
6. Calcium chloride-
7. Calcium carbonate-
8. Sodium chloride-
How is wavelength measured (Select all that apply. from the trough (bottom) of one wave to the trough of the next wave
from the trough (bottom) of one wave to the crest (top) of the next wave
from the crest (top) of one wave to the crest (top) of the next wave
from the crest (top) of one wave to the trough (bottom) of the next wave
Answer:
The first two
Wavelength is measured from crest to crest. Amplitude is from trough to crest or crest to trough
A solution has a hydronium or hydrogen ion concentration of 3.16×10^-8M. What is the ph of the solution?
Answer:
7.50Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]pH = - log(3.16 \times {10}^{ - 8} ) \\ = 7.500312...[/tex]
We have the final answer as
7.50Hope this helps you
How many valence electrons are in Sn+2? please answer asap thank you
Answer:
2 electrons
Explanation:
write net ionic equations for the reaction, if any, that occurs when aqueous solutions of the following are mixed. a. ammonium sulfate and barium nitrate
Answer:
SO₄²⁻(aq) + Ba²⁺(aq) ⇒ BaSO₄(s)
Explanation:
Let's consider the molecular equation that occurs when aqueous solutions of ammonium sulfate and barium nitrate are mixed.
(NH₄)₂SO₄(aq) + Ba(NO₃)₂(aq) ⇒ BaSO₄(s) + 2 NH₄NO₃(aq)
The complete ionic equation includes all the ions and insoluble species.
2 NH₄⁺(aq) + SO₄²⁻(aq) + Ba²⁺(aq) + 2 NO₃⁻(aq) ⇒ BaSO₄(s) + 2 NH₄⁺(aq) + 2 NO₃⁻(aq)
The net ionic equation includes only the ions that participate in the reaction and the insoluble species.
SO₄²⁻(aq) + Ba²⁺(aq) ⇒ BaSO₄(s)
which elements are solid at room temperature
Answer:bromine , neon , helium , argon , lithium , beryllium
Explanation:
Elements can be divided into three state that are solid, liquid and gas depending the intermolecular forces of attraction, distance between the particles etc. Lithium, beryllium, boron, carbon, sodium, magnesium, iron, copper, etc. are solid at room temperature.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Elements can be solid liquid or gas at room temperature.
Therefore, Lithium, beryllium, boron, carbon, sodium, magnesium, iron, copper, etc. are solid at room temperature.
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True or false: oceans have no efect on the temperature on Earth’s land.
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Answer:
False
Explanation:
Answer
is it FALSE?
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A physical change is when the form or shape of a substance changes, but
the chemical structure remains the same. *
True
False
What is the mass (in grams) of 255ml of mercury if mercury has a density of 13.34 grams per ml? (Remember significant digits in answer)
The mass in grams of 255mL of mercury if it has a density of 13.34g/mL is 3401.7g.
How to calculate mass?The mass of a substance can be calculated by multiplying the volume of the substance by its density as follows:
Mass = density × volume
According to this question, 255mL of mercury has a density of 13.34g/mL. The mass is calculated as follows:
Mass = 13.34g/mL × 255mL
Mass = 3401.7g
Therefore, the mass in grams of 255mL of mercury if it has a density of 13.34g/mL is 3401.7g.
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