Answer:
6.941
Explanation:
What does the number on the bottom left of the symbol show?
Answer:
How many protons the elements has.
Explanation:
It is the atomic number, and that is the number of protons that an element has.
Answer:
The number at the bottom left shows the atomic number of the element. It’s the number of protons in the nucleus.
Explanation:
If 1.75 g of titanium metal reacts with 1.25 g of oxygen gas to form titanium (IV) oxide, what is the theoretical yield of the product?
Answer:
Theoretical yield is 2.92g TiO₂
Explanation:
The reaction of Ti with O₂ to produce TiO₂ is:
Ti + O₂ → TiO₂
First, we need to find moles of titanium and oxygen. As the reaction is 1:1, we can determine directly the limiting reactant, the theoretical moles of TiO₂ and thus, theoretical yield:
Moles Ti (molar mass: 47.867g/mol):
1.75g * (1mol / 47.867g) = 0.03656 moles Ti
Moles O₂ (molar mass: 32g/mol):
1.25g * (1mol / 32g) = 0.0390 moles O₂
That means only 0.03656 moles of Ti will react withe 0.03656 moles of O₂ producing 0.03656 moles of TiO₂
As molar mass of TiO₂ is 79.866g/mol, the theoretical yield of the product is:
0.03656 moles TiO₂ * (79.866g / mol) = 2.92g TiO₂
Theoretical yield is 2.92g TiO₂The theoretical yield of the reaction of titanium and oxygen has been 2.92 grams.
The balanced reaction for the reaction of Titanium with oxygen can be given as:
[tex]\rm Ti\;+\;O_2\;\rightarrow\;TiO_2[/tex]
According to the balanced equation, 1 mole of Ti gives 1 mole of Titanium oxide.
The moles of Ti can be given as:
Moles = [tex]\rm \dfrac{mass}{molecular\;mass}[/tex]
The molecular mass of Ti has been 47.867 grams.
Moles of Ti has been:
Moles of Ti = [tex]\rm \dfrac{1.75}{47.867}[/tex]
Moles of Ti = 0.036 mol.
Moles of Oxygen has been:
Moles of oxygen = [tex]\rm \dfrac{1.25}{32}[/tex]
Moles of oxygen = 0.0390 mol.
The moles of Ti has been less than the required moles of Ti for the complete utilization of oxygen, thus titanium has been the limiting reactant.
1 mole of Titanium = 1 mole of titanium oxide
0.036 mol of Titanium = 0.036 mol of titanium oxide
The mass of 0.036 mol titanium oxide has been:
Mass = moles × molecular weight
Mass of titanium oxide = 0.036 mol × 79.866 g/mol
Mass of titanium oxide = 2.92 grams.
The theoretical yield of the reaction of titanium and oxygen has been 2.92 grams.
For more information about the theoretical yield, refer to the link:
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How many electrons would Magnesium with a -1 charge have?
While 1 gram of fat provides 9 calories, 1 gram of glucose provides 4 calories. Why is that?
Answer:
fat always has more calories than glucose does
Explanation:
hope hope this helps!
Fat contains more chemical bonds than glucose.
The chemical energy stored in food substances is released when the chemical bonds in those food substances are broken down during digestion.
The more the number of chemical bonds in a food substance, the greater the energy released when 1g of that substance is is broken down.
We must recall that glucose contains only six carbon atoms while fat is composed of triglycerides having several carbon atoms. The breakdown of these many chemical bonds surely releases more energy.
Hence, 1 gram of fat provides 9 calories while 1 gram of glucose provides 4 calories.
https://brainly.com/question/857310
Beryllium-9
Neutrons:
Protons:
Electrons:
Answer:
Neutrons - 5
Protons - 4
Electrons - 4
Explanation:
Beryllium (Be) is the 4th element on the Periodic Table.
It has 4 protons and 4 electrons (neutral charge)
Atomic Mass = # of Protons + # of Neutrons
9 = 4 + x
x = 5 Neutrons
A metallic material that is made by uniformly mixing copper with zinc to form bronze.
YOU SUCK YOUR MOMS CHIVKEN NUGGA YOU WHODDDDDDD :))))))))) \\\
it is not dirty so do try it >:((((((Nutrients are added to soil with the help of?
A: decomposers
B: herbivores
C: predators
D: prey
Answer:
Decomposers
Explanation:
Decomposers, well as in the name, ingest decomposing things and or droppings, and turn it into nutrients.
How many ways can 8642 be arranged
Answer:
In 100 ways
Explanation:
The energy needed for the following process is 1.960 × 104 kJ/mol: Li(g) → Li3+(g) + 3e− If the first ionization energy of lithium is 5.20 × 102 kJ/mol, calculate the second ionization energy of lithium—that is, the energy required for the process: Li+(g) → Li2+(g) + e− A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by En = −(2.18 × 10−18 J) (Z2)(1/n2) where En is the energy of the electron in the hydrogen-like ion, n is the principal quantum number, and Z is the atomic number of the element. Second ionization energy of lithium: × 10 kJ/mol (Enter your answer in scientific notation)
Answer:
Second Ionization energy, IE₂ = 7.27 x 10³ kJ/mol
Explanation:
Using En = -2.18 x 10¹⁸ J (Z²)(1/n²)
Z = atomic number; n = energy state of electron
Lithium has atomic number, Z = 3
Energy for n = 1:
E₁ = -2.18 x 10¹⁸ J (3²)(1/1²) = -1.962 x 10⁻¹⁷ J
When an electron is completely remove from an atom, n = ∞
Energy for n = ∞:
E∞ = -2.18 x 10¹⁸ J (3²)(1/∞²) = 0 J
Energy absorbed by the electron in order to be removed from the atom completely, ΔE = E∞ - E₁
ΔE = 0 - (-1.962 x 10⁻¹⁷ J) = 1.962 x 10⁻¹⁷ J = 1.962 x 10⁻²⁰ kJ
Ionization energy in kJ/mole of Li²⁺ ions, IE₃ is then calculated thus:
1 mole of Li²⁺ ions contains 6.02 x 10²³ ions
Ionization energy in kJ/mole of Li²⁺ ions = 1.962 x 10⁻²⁰ kJ x 6.02 x 10²³ = 1.185 x 10⁴ kJ/mol
Total energy, Etotal = IE₁ + IE₂ + IE₃
Second Ionization energy, IE₂ = Etotal - ( IE₁ + IE₃
IE₂ = 1.960 x 10⁴ kJ/mol - (520 kJ/mol + 1.185 x 10⁴ kJ/mol)
IE₂ = 7.27 x 10³ kJ/mol
Lithium-4 and Lithium-5 can be defined as:
A: isotopes
B: different elements
C: ions
D: average atomic masses
Answer:
A: isotopes
Explanation:
Hello.
In this case, since isotopes are defined as atoms of the same element with the same atomic number (number of protons and electrons) but different mass number (atomic mass) we can represent them via the symbol of the element followed by a dash indicating the atomic mass of the occurring isotope, for instance, for carbon, we may find C-12, C-13 and even C-14 which is useful in dating techniques.
Therefore, Lithium-4 or Li-4 and Lithium-5 or Li-5 can be defined as isotopes.
Best regards.
please help i’ll give brainliest
28 mL
it counts by 2 from 20
Answer:
28 ml
Explanation:
28 ml
my aunt told me
how many significant figures are in the number 0.00346
Answer:
3
Explanation:
Significant figures are the number of digits in a value, often a measurement, that to the degree of accuracy of the value. All non-zero numbers ARE significant. ...
Zeros between two non-zero digits ARE significant. ...
Leading zeros are NOT significant. ...
Trailing zeros to the right of the decimal are significant. ...
Trailing zeros in a whole number with the decimal shown ARE significant.contributes
Answer: 3 significant figures
Explanation:
Phosphoric acid (H3PO4) is an important industrial chemical used in fertilizers, detergents, and in the food industry. It is produced by two different methods. In the electric furnace method, elemental phosphorus (P4) is burned in air to form P4O10, which is then reacted with water to give H3PO4. In the wet process, the mineral phosphate rock [Ca5(PO4)3F] is reacted with sulfuric acid to give H3PO4 (and HF and CaSO4). (a) Write the balanced equations for the electric furnace method. Include the phase abbreviations.
Answer:
P₄(s) + 5 O₂(g) ⇒ P₄O₁₀(s)
P₄O₁₀(s) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)
P₄(s) + 5 O₂(g) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)
Explanation:
The electric furnace method for the synthesis of phosphoric acid has 2 steps. In the first step, elemental phosphorus (P₄) is burned in air to form P₄O₁₀. The balanced reaction is:
P₄(s) + 5 O₂(g) ⇒ P₄O₁₀(s)
In the second step, P₄O₁₀ reacts with water to give phosphoric acid.
P₄O₁₀(s) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)
If we add both steps, we get the global reaction.
P₄(s) + 5 O₂(g) + 6 H₂O(l) ⇒ 4 H₃PO₄(aq)
determine the molarity of 3.72 moles of NaBr in 575 ml of solution
Answer:
6.47 M (3 s.f.)
Explanation:
Please see the attached picture for the full solution.
A 2 mL sample of concentration 0.0043 M is measured out with a volumetric pipet and diluted to 100.0 mL. What is the concentration (in M) for this solution? Give your numerical answer to three significant figures and leave off the unit label.
Answer:
Explanation:
The dilution formula is
s₁ v₁ = s₂ v₂
s₁ = .0043
v₁= 2 mL
v₂ = 100 mL
s₂ = ?
putting the values
.0043 x 2 = s₂ x 100
s₂ = .000086 = 86.0 x 10⁻⁶
Which activity removes a large amount of alcohol from the body
Which activity removes a large amount of alcohol from the body? After alcohol has been consumed and reaches the bloodstream, up to 10% of the alcohol is disposed of through the urine, and 80% to 90% by oxidation in the liver. The average drinker eliminates about 2/3 of a standard drink unit (a shot) per hour.
Which Bohr model shows the correct # of electrons for a neutral sodium atom
that has 11 protons and 12 neutrons? *
Answer:
3 option........
Explanation:
i think
What is the pH of 0.10 M HNO2 solution? (Ka= 4.0 x 10-4)|
Answer:
The answer is 2.2Explanation:
Since the above substance is a weak acid it's pH can be found by using the formula
[tex]pH = \frac{1}{2} ( - log(Ka ) - log(c) )[/tex]
where
Ka is the acid dissociation constant
c is the concentration of the acid
From the question
Ka = 4.0 × 10-⁴
c = 0.1 M
So we have
[tex]pH = \frac{1}{2} ( - log(4.0 \times {10}^{ - 4} ) - log(0.1) ) \\ = \frac{1}{2} (3.4 + 1) \\ = \frac{1}{2}(4.4) \: \: \: \: \: \: \: \: [/tex]
We have the final answer as
2.2Hope this helps you
.....m..........m.....mm...
Answer:
Nuclear Regulatory Commission
What should u do if a girl makes a move on you?
Particles emitted from metals caused by high frequency light are
O photons
* electrons
O protons
O neutrons
The air pressure inside a balloon is 0.78 atm. What is this
pressure in mmHg?
mmHg
Your answer should be rounded to 2 significant figures. Do not include units in
Answer:
The pressure in mmHg is 59.
Explanation:
Given data:
Pressure of air inside balloon = 0.78 atm
Pressure in mmHg = ?
Solution:
mmHg:
mmHg is referred as manometric unit of pressure. It is define as the pressure exerted by mercury column at height of one millimeter.
Symbol:
"mmHg"
Atmosphere (atm)
atm is unit of pressure. It is used as a standard unit. It is equal to the 101325 Pa.
1 atm = 760 mmHg
Inorder to convert the atm into mmHg we will multiply the given atm value with 760.
0.78 atm × 760 mmHg / 1 atm = 592.8 mmHg
59 mmHg or 59
Determine whether each statement is a description of a physical property or a chemical property. Please check the box that applies.
Copper conducts heat well.
physical
chemical
Alcohol has a sweet odor.
physical
chemical
Answer:
Copper conducts heat well- physical
Alcohol has a sweet door- physical
Explanation:
Answer:
a, a
Explanation:
Arrange the following elements in order of decreasing electronegativity:
Strontium, Magnesium, Barium, Beryllium, Radium and Calcium.
Answer:
Be,Mg,Ca,Sr,Ba.Ra[down the group electronegativity is decreasing]
Explanation:
The following elements in order of decreasing electronegativity are:
Beryllium > Magnesium > Calcium > Strontium > Barium > Radium.
Which is the correct order for decreasing the strength of electronegativity?Electronegativities decrease from top to bottom within a group of elements. The order of decreasing electronegativities F > Cl > Br > I is another sequence that we will use to interpret the chemical and physical properties of organic compounds.
What is the order of decreasing atomic radius?
In the periodic table, atomic radii decrease from left to right across a row and increase from top to bottom down a column. Because of these two trends, the largest atoms are found in the lower-left corner of the periodic table, and the smallest are found in the upper right corner.
Learn more about electronegativity here: brainly.com/question/2456715
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Both elements and compounds are considered to be
Answer:
Pure Substances.
Explanation:
Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element.
What is the correct definition of speed?
A. time per distance (hours per mile or seconds per meter)
B.distante per time (miles per hour or meters per second)
C.time (hours or seconds
D.distance (miles or meters)
Answer:
B
Explanation:
Answer the following questions about the element selenium, Se (atomic number 34). b) Write the complete electron configuration for a selenium atom in the ground state. Indicate the number of unpaired electrons in the ground-state atom, and explain your reasoning. c) In terms of atomic structure, explain why the first ionization energy of selenium is i) less than that of bromine (atomic number 35), and ii) greater than that of tellurium (atomic 52).
Answers and Explanation:
b) Complete electron configuration of Se:
1 s² 2 s²p⁶ 3 s²p⁶ 4 s²p⁴
Se has 4 energy levels, with an incomplete 4th level (they are necessary 2 electrons to complete p orbital in the 4th level).
c) The first ionization energy of Se
i) is less that of bromine (Br) because the first ionization energy increases from left to right in a period in the Periodic Table. Se and Br are in the same period, and Se is located to the left of Br so Se has lesser ionization energy than Br.
ii) is greater than that of tellurium (Te) because the first ionization energy decreases from top to bottom in a group in the Periodic Table. Se and Te are in the same group, and Se is at the top of Te. Hence, Se has a greater first ionization energy than Te.
Complete electron configuration of Selenium is [tex]\rm 1s^2\;2s^2\;2\;p^6\;3\;s^2\;3\;p^6\;4\;s^2\;4\;p^4[/tex]
The first ionization energy of selenium is less than that of bromine as
Se and Br belong to same period.
The first ionization energy of selenium greater than that of tellurium as
Se and Te belong to same group.
Se has been a nonmetal with atomic number 34.
b. The complete electron configuration of Selenium has been given as:
[tex]\rm 1s^2\;2s^2\;2\;p^6\;3\;s^2\;3\;p^6\;4\;s^2\;4\;p^4[/tex]
The number of unpaired electrons in the ground state has been 2, as p sub shell occupies 6 electrons. The presence of 4 electrons made 2 unpaired electrons available.
c. The first ionization energy has been the amount of energy required to remove an electron form the ground state of the atom. In the periodic table on moving down the group there has been an decrease in the first ionization energy with the decrease in nuclear attraction on the outer most shell.
On moving from left to right, there has been an increase in first ionization energy with the increase in attraction force due to the increase electron in a shell.
Se and Br belong to same period. Since Br is located right to Se, Se has lesser ionization energy than Br.Se and Te belong to same group. With Te present below Se, it has lesser ionization energy than Se.For more information about selenium, refer to the link:
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What is the wavelength of radiation that has a frequency of 5.9×1011 s−1 ?
Answer:
frequency = velocity of light /wavelength
wavelength = velocity / frequency
=3 x10^8 / 5.9 x 10^11
=0.508 x 10^-3.
Calculate the frequency of red light that has a wavelength of 700 nm.
What is the pH in a 1.5 M solution of hydrofluoric acid?
[tex]HF \rightleftharpoons H^{+} + F^{-}\\[/tex]
We have 1.5 M HF in the beginning and 0 M [tex]H^{+}[/tex] and [tex]F^{-}[/tex]
We know that there's gonna be a decrease of x M on [tex]HF[/tex] and an increase of x M on [tex]H^{+}[/tex] and [tex]F^{-}[/tex].
We also find in chemistry tables that [tex]K_{a}(HF) = 6.8 \cdot 10^{-4}[/tex]
[tex]K_a = \frac{[H^+] \cdot [F^-]}{[HF]}\\6.8 \cdot 10^{-4} = \frac{x \cdot x}{1.5 - x} \\6.8 \cdot 10^{-4} = \frac{x^2}{1.5}\\6.8 \cdot 10^{-4} \cdot 1.5 = x^2\\x^2 = 1.02 \cdot 10^{-3}\\x = 0.0319\\pH = -\log{0.0319}\\pH = 1.5[/tex]
