Answer:
Interphase is the longest part of the cell cycle, this is when the cell grows and copies its DNA before moving into mitosis.
Explanation:
Answer:
Interphase
Explanation:
please help i’ll give brainliest
28 mL
it counts by 2 from 20
Answer:
28 ml
Explanation:
28 ml
my aunt told me
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.
(1.7 x 10-5 m) x (3.72 x 10-4 m) *
Answer:
The answer will be 1992/5 or 398.4
The lungs are connected to the trachea by _____. bronchi windpipes alveoli capillaries
Answer:
Bronchi
Explanation:
The trachea divides into air tubes called the bronchi, which connects it to the lungs.
Answer:
bronchi
Explanation:
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:
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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what happens during the dissolution of wax in kerosene
Answer:
The wax will totally dissolve in the kerosene.
Explanation:
Hello.
In this case, since wax is more specifically known as paraffin wax which is a heavy-highly nonpolar organic compound which is largely insoluble in water due to its nonpolar nature, when dissolved in kerosene which is a highly nonpolar organic solvent we can infer that the dissolution process will rapidly undergo even at normal conditions due to the intermolecular forces joining them.
Therefore, when wax is dissolved in kerosene a complete dissolution is evidenced due to their common nature.
Best regards.
Why are nutrient molecules important?
A nutrient is a substance used by an organism to survive, grow, and reproduce. The requirement for dietary nutrient intake applies to animals, plants, fungi, and protists. Nutrients can be incorporated into cells for metabolic purposes or excreted by cells to create non-cellular structures, such as hair, scales, feathers, or exoskeletons. Some nutrients can be metabolically converted to smaller molecules in the process of releasing energy, such as for carbohydrates, lipids, proteins, and fermentation products (ethanol or vinegar), leading to end-products of water and carbon dioxide. All organisms require water. Essential nutrients for animals are the energy sources, some of the amino acids that are combined to create proteins, a subset of fatty acids, vitamins and certain minerals. Plants require more diverse minerals absorbed through roots, plus carbon dioxide and oxygen absorbed through leaves. Fungi live on dead or living organic matter and meet nutrient needs from their host.
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.
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 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]
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.
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
The arrows in the chart below represent phase transitions.
Solid
Liquid
16
Gas
Which arrows represent the phase transitions in which heat energy is gained?
1, 2, and 3
2,3, and 5
3, 4, and 5
4,5, and 6
Answer:
A: 1, 2, and 3
Explanation:
mY ANSWER GOT DELETED ITS WHAT I SAID BEFORE ITS ON EDGE2020
Answer:
A. 1, 2, and 3
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
.....m..........m.....mm...
Answer:
Nuclear Regulatory Commission
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 >:((((((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
Torque can be calculated by multiplying the force (N) applied at 90∘ to the lever arm at a distance (m) from the pivot point (point of rotation), the compound SI unit for the torque is N⋅m. If the force (at 90∘ to the lever arm) applied is 15 N and it is applied at 2.0 m from the pivot point (point of rotation), what is the torque on the lever?
Answer:
F=15 N
Moment arm=2 m
torque=Fl=15x2=30 Nm
Explanation:
How many electrons would Magnesium with a -1 charge have?
Atoms are generally held together by attraction between neutrons and protons (the strong interaction) and stabilized by electrons. As atoms increase in mass, it becomes easier for them to have too many or too few neutrons, leading to radioactive isotopes of certain elements. What factors might allow this to happen?
Answer:
im pretty sure the answer is: alpha decay, beta decay, and gamma decay.
Explanation:
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:
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
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.
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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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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)
Acetone is produced from 2-propanol in the presence of dioxygen and the photocatalyst TiO2 when the reactor is irradiated with ultraviolet light. For a reaction carried out at room temperature in 1.0 mol of liquid 2-propanol containing 0.125 g of catalyst the following product concentrations were measured as a function of irradiation time. Calculate the first order rate constant.
Reaction Time min 20 40 60 80 100 120 140 160 180
Acetone Produced 1.9 3.9 5.0 6.2 8.2 10 11.5 13.2 14.0
Answer:
20 30 40 50 is the answer to that one day
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.
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.
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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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
