The correct answer is A. A pH of 7 say about a solution is The solution is neutral.
What is a pH of 7A pH of 7 indicates a neutral solution. The pH scale is a logarithmic scale that measures the acidity or alkalinity (basicity) of a solution. A pH value of 7 is considered neutral, which means the concentration of hydrogen ions (H+) is equal to the concentration of hydroxide ions (OH-) in the solution. In other words, the solution is neither acidic nor basic.
Acidic solutions have a higher concentration of hydrogen ions (H+), which makes them more acidic. The lower the pH value, the higher the concentration of H+ ions and the stronger the acid.
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Can yall help me with this
The summary of the paragraph is that if you live on a high latitude there would be greater seasonal variation.
What is the equator?The equator is said to be that imaginary line that does divide the earth into the Northern and the southern Hemispheres. This implies that the equator is the line that divides the earth into to halves and the two haves of the earth are responsible for the variations in many things on earth such as the day and night experience.
We can see from the passage that if you are living in a position that is closer to the equator then it follows that the variation of day and night would have less difference as well as less of seasonal differences.
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todd is attempting to finish an extraction begun by his lab partner. at this time, his separatory flask contains water and toluene, with benzylamine, 1,3-diphenylacetone, and phenol dissolved in the toluene layer. to separate out the benzylamine, he should add:
HCl can be added to separate benzylamine from the toluene mixture.
A widely used method of separating two liquids from each other or popularly called liquid-liquid extraction is being implemented here.
The knowledge of pH values helps in treating the contents of the solution that is to be extracted and their subsequent isolation as well Here, the concept of acid-base extraction is applied to understand that the separation of benzylamine which is an organic base can be done by extracting it by adding HCl to the solution. The addition of hydrochloric acid leads to the formation of a corresponding ammonium salt, the amine can be later recovered by adding a base thereby converting the formed compound back to benzylamine.
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In the following reaction:
2 NaCl + Pb → PbCl2 + 2 Na
100.0 grams of Pb are added to an excess of NaCl. How many moles of Na are produced?
Answer:
About 0.965 mol Na
Explanation:
Which element has the ground state electronic configuration, 1s22s22p63s23p64s1 ?.
Potassium is the element that has the ground state electronic configuration, 1s22s22p63s23p64s1.
The electronic configuration describes the distribution of electrons in their atomic orbital. In an electronic Configuration, subshells that contain electrons, and the total number of electrons in each of the subshells are written in a sequence.
It is used to find out the valency of an element, Predict the properties of a group of elements and Interpret atomic spectra.
The subshells are s, p, d, and f and the total number of electrons that they can hold is 2, 6, 10, and 14 respectively.
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Calculate the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of caf2 in 850.0 g of water.
the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of caf2 in 850.0 g of water. is 0.00840 moles
The calculation of the mole fraction is as follow:
As we know that
Molar mass = Number of grams ÷ number of moles
Or
number of moles = Number of grams ÷ molar mass
from the question
Number of moles of CaI2 = 0.400
And, Molar mass of water = 18.0 g/mol
Now we can calculate the moles of water is
= 850.0 g ÷ 18.0 g/mol
= 47.22 mol
And, Total number of moles is
= 0.400 + 47.22
= 47.62
So, Mole fraction of CaI2 is
= 0.400 ÷ 47.62
= 0.00840 mole
hence, the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of caf2 in 850.0 g of water. is 0.00840 moles
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The carbon cycle is normally self-regulating; it keeps itself constant. The amount of carbon dioxide kept in the oceans, locked in rocks and in the air is
ANSWER
over time.
a balloon of helium has a volume of 1.0 l at 0.98 atm. the balloon floats in the sky until the pressure is 0.50 atm. what is the new volume assuming temperature is constant?
According to the given statement 1.96 L is the new volume assuming temperature is constant.
What qualifies as an ideal gas?An volume of a gas is just one where there were no intermolecular attraction forces and all collisions involving atoms or molecules are entirely elastic. It can be seen as a group of perfectly spherical particles that collide but do not otherwise interact with one another.
Briefing:Initial pressure (P₁): 0.98 atm
Initial volume (V₁): 1.0 L
Final pressure (P₂): 0.50 atm
Final volume (V₂): ?
Boyle's law provides an expression for this for an ideal gas that experiences an isothermal change.
P₁×V₁ = P₂×V₂
V₂ = P₁×V₁ / P₂
V₂ = 0.98 atm * 1.0 l / 0.50 atm
V₂ = 1.96 L
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The box shows the element helium as it appears in the periodic table. He Helium 4.0 Which list gives the correct numbers of subatomic particles for a neutral atom of helium?
A. Two protons, four neutrons, six electrons
B. Two protons, two neutrons, two electrons
C. Two protons, two neutrons, four electrons
D. Four protons, four neutrons, four electrons
The correct numbers of subatomic particles for a neutral atom of helium are C) Two protons, two neutrons, four electrons
What are subatomic particles ?
Any of the multiple self-contained units of matter or energy that are the building blocks of all matter are considered subatomic particles, also known as elementary particles. They include the heavier constituents of the small but extremely dense atom's nucleus, the positively charged protons and the electrically neutral neutrons, as well as the electrons, the negatively charged, nearly massless particles that still make up the majority of the atom's size. The only known subatomic particles, however, are not these fundamental atomic building blocks.
These particles are frequently referred to as subatomic particles since they are the building blocks of atoms. There are protons, neutrons, and electrons, three types of subatomic particles. Protons and electrons, two of the subatomic particles, each have an electrical charge of one or the other.
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Lit the following ubtance in order from lowet denity to highet denity:
iron, gold, teel, water, air, ilver, aluminum, gaoline
Answer:
1.water 2. air 3.aluminum 4.steel 5.iron 6.silver 7.gold
Explanation:
The density of iron is = 7.86 g/mL
The density of gold is = 19.3 g/mL
The density of steel is = 7.8 g/mL
The density of water is = 1.00 g/mL
The density of air is = 1.29 g/mL
The density of silver is = 10.5 g/mL
The density of aluminium is = 2.70 g/mL
so..
water < air < aluminum < steel < iron < silver < gold
In the following reaction:
2 NaClO4 → 2 Na + Cl2 + 4 O2
How many moles of O2 will be produced when 15.6 moles of NaClO4 decompose?
Answer:
31.2 moles of O2
Explanation:
You have to do stoichiometry to convert moles of NaClO4 to moles of O2.
You have 15.6 moles of NaClO4, you need these to cancel out so you use your coefficient from the equation. Since you are trying to find moles of O2 you put your coefficient of oxygen in the numerator. Multiply across the top & divide by the bottom to get 31.2 moles of O2.
[tex]\frac{15.6 mol NaClO4}{1} * \frac{4 mol O2}{2 mol NaClO4}[/tex]
What was the initial volume of a gas that had an initial temperature of 20.65 C if it reached a final temperature of 41.77 C and final volume of 16.14 L.
If a gas had an initial temperature od 20.65 C and a final temperature of 41.77 C, its initial volume would be 7.979.
How are volume and example used?The volume of any solid in three dimensions is equal to the area it occupy. These solids include shapes like a cube, cuboid, conical, cylinder, and sphere. The form affects how much volume there is.
What does a gas' volume mean?The space occupied by the gaseous particles under typical pressure and temperature circumstances is referred to as the volume of gas. It has the symbol "V." The symbol for volume in the SI is "liters," or "L". When the gas is at normal temperature, a mole has a volume of 24 m3, or 24 000 cm3. The molar volume of a gas is this quantity.
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list five major parts of a long bone
The 5 major parts of the long bone are :
.The Proximal epiphysis
. The distal ephiphysis
.The compact bone
.The Diphysis
.The metaphysis.
What are long bones?
They are long, wide, and cylindrical in shape. They act as levers. e.gFemur, tibia, fibula, metatarsals, humerus, ulna, radius, metacarpals, and phalanges.
The five major parts of a long bone
.The Proximal epiphysis: This is made up of the spongy bone and articular cartilage.
.The distal epiphysis: This is enclosed by a membrane of connective tissue called the periosteum.
.The metaphysis: This is made up of an epiphyseal line and red bone marrow.
.The Diphysis: This is found in the medullary cavity which has an inner core of bone marrow. It contains nutrients and helps in the formation of cells, made up of yellow marrow in the adult and red marrow in the child.
.The compact bone: This is the outer shell of the long bone is made of cortical bone called compact bone.
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For substances at the same temperature absorb equal amounts of energy the specific heat of the four substances are 1.01J/G Celsius, 1.01J/G Celsius, 0.3 AJ/G Celsius, and 0.4 4J/G Celsius what is the specific heat value of the substance I will have highest in Chrisman in temperature
The substance with the highest specific heat value will have the highest increase in temperature.
What is a chemical reaction ?
Chemical reaction, the process by which one or more substances (reactants) are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.
Chemical reactions are part of technology, culture, life . Fuel combustion, glass and pottery making, beer , and wine and cheese making are few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are abundant in a variety of complex processes occurring in the Earth's geology, atmosphere and oceans, and in all biological systems.
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which two of the following electronic configurations (in quantum mechanical notation) are not reasonable? indicate the letters of the two unreasonable electronic configurations: . a) 1s22s22p4 b) 1s22s22p73s23p4 c) 1s22s22p63s23p5 d) 1s22s62p5
1s²2s²2p⁷3s²3p⁴ two of the following electronic configurations (in quantum mechanical notation) are not reasonable.
The correct option is B.
How do you find the electron configuration?Using subshell labels, the electronic structure of an atom is described. These labels include the subshell name, which is determined by the azimuth and elevation quantum number, the shell number, which is determined by the main quantum number, and the total quantity of electrons in the subshell, which is indicated in superscript.
What three factors influence electronic configuration?An atom's electron configuration describes how its electrons are dispersed across its orbits (shells) and subshells. An atom's electron configuration is crucial because it aids in predicting a substance's chemical, physiological, electrical, and magnetic characteristics.
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Which statement correctly describes a chemical
reaction at equilibrium?
A.
B.
C.
D
The concentrations of the products and
reactants are equal.
The concentrations of the products and
reactants are constant.
The rate of the forward reaction is less than
the rate of the reverse reaction.
The rate of the forward reaction is greater
than the rate of the reverse reaction.
Answer: The concentrations of the products and
reactants are equal.
Explanation:
you do a calculation on a molecule and determined that the energy of the highest occupied molecular orbital (homo) is -2.42 hartree, and the energy of the lowest unoccupied molecular orbital (lumo) is 0.65 hartree. what is the wavelength of the photon required to excite this molecule from its ground state, to its first excited state?
The wavelength of the photon required to excite this molecule from its ground state, to its first excited state is 1240 nm.
This is given by the equation:
wavelength = hc/(E_homo - E_lumo)
where h is Planck's constant =6.626070 * 10^-34 J.m , c is the speed of light = 3.0 x 10^8 m/s^2, and E_homo and E_lumo are the energies of the highest occupied molecular orbital and the lowest unoccupied molecular orbital, respectively.
In this particular case, the wavelength of the required photon would be:
wavelength = hc/(-2.42 hartree - 0.65 hartree)
= 6.626070 * 10^-34 X 3.0 x 10^8 / (-3.07)
= 1240 nm
Hence , The wavelength of the photon required to excite this molecule from its ground state, to its first excited state is 1240 nm.
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write the net ionic equation for the reaction that occurs when 0.087 mol hcl is added to 1.00 l of the buffer solution. use h3o instead of h .
The net ionic equation for the reaction that occurs NO2- + H3O+ = HNO2 + H2O
If HCl is added, then it reacts with the conjugate base of HNO2 means NaNO2.
The ionic equation via breaking all the soluble ionic compounds (the ones marked with an (aq)) into their respective ions. every ion has to be shown with its price and an (aq) to reveal that its miles are present inside the answer. Use coefficients to reveal the variety of every ion present.
A molecular equation is an equation wherein the formulation of the compounds is written as though all materials exist as molecules. An ionic equation is one wherein dissolved ionic compounds are proven as loose ions. Examples of molecular and ionic equations are proven.
Ionic equations and internet ionic equations are usually written most effectively for reactions that arise in answer and strive to show how the ions present are reacting.
If NaOH is added then it must react with the weak acid HNO2.
Thus, the net reaction contains NaNO2.
NaNO2 + HCl = HNO2 + NaCl
The ionic equation will be:
NO2- + H3O+ = HNO2 + H2O
(because it is given to use H3O+ instead of H+)
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An element has a mass number of 110 and an atomic number of 55. how many protons, electrons, and neutrons does it have? 1 point a. 55 p+ 55 e- 55 n b. 110 p+ 110 e- 55 n c. 55 p+ 110e- 55 n d. 55 p+ 55 e- 110 n
The number of protons, electrons, and neutrons are 55 p+ 55 e- 55 n. They are subatomic particles in the element. They can be calculated from the atomic number and the mass number.
How to find the number of protons, electrons, and neutrons?Every element has a mass number and an atomic number. The number of protons, electrons, and neutrons can be calculated from the mass number and the atomic number.
Number of protons (p+) = atomic numberNumber of electrons (e-) = atomic number - ionNumber of neutron (n) = mass number - atomic numberIf given
A mass number = 110An atomic number = 55How many protons, electrons, and neutrons?
Number of protons
= atomic number
= 55
Number of electrons
= atomic number - ion
= 55 - 0
= 55
Number of neutron
= mass number - atomic number
= 110 - 55
= 55
Hence, the number of protons, electrons, and neutrons are 55 p+ 55 e- 55 n.
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I need help with number 5
Answer:
25
E
12
Explanation:
As shown in the pic
Mass number = 12 + 13 = 25
Atomic number = No of protons = 12
onsidering that the naoh should be within a few percent of 0.30 m, what volume (in ml) would you expect to use for your third trial with 2.0453 g of khp?
The volume (in ml) would we expect to use for our third trial with 2.0453 g of KHP will be 33.0 ml
Molarity of NaOH = 0.30 molar
Mass of KHP = 2.0353 G
Molar mass of KHP = 204.2 g/mol
Volume of NaOH = ?
First we will find out the number moles of KHP
number of moles = mass / molar mass
number of moles of KHP = 2.0453 g / 204.2 g/mol
number of moles of KHP = 0.010 mol
Now we will find out the volume of NaOH
volume = number of moles / molarity
volume of NaOH = 0.010 mol / 0.30 M
volume of NaOH = 0.033 L
Conver L to ml
volume of NaOH = 0.33 L * 1000
volume of NaOH = 33.0 ml
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Use the equation below to answer the following question. How many grams of hydrogen are necessary to
react completely with 50.0 g of nitrogen in the reaction of the formation of ammonia?
N₂ + 3H2 → 2NH3
O 10.8 g H₂
O
15.0 g H₂
O
20.1 g H₂
O 41.2 g H₂
DONE
The mass of hydrogen necessary to react with 50.0g of nitrogen in the reaction of ammonia is 10.8g.
What is ammonia?
Ammonia is a colorless gas which when dissolved in water readily gives ammonium hydroxide which causes irritation. It can also be used as cleaning agent also it is a pungent gas composed of hydrogen and nitrogen.
According to the given equation of ammonia formation,
N2 + 3H2 -------> 2NH3
there is 1 mole of nitrogen reacting with 3 moles of hydrogen to give 2 moles of ammonia. In terms of mass, 28.01g of nitrogen needs 3 moles of hydrogen that is 6.048g of hydrogen.
We can say that,
28.01g of N2 requires 6.048g of hydrogen,
1g of N2 requires = 6.048 / 28.01 = 0.048g
50g of N2 requires = 0.048 x 50.0 = 10.8g of H2.
Therefore, 10.8g of H2 is required to react with 50.0 g of N2 to make ammonia.
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Answer:
its a
Explanation:
10.8 g H2
if he gas has an average kinetic energy of 6950 j/mol6950 j/mol under certain conditions, what is the root mean square speed of o2 gas molecules under the same conditions
The root mean square speed of O₂ gas molecules under the same conditions is 521.04ms⁻²
Kinetic energy is the energy an object has because of its motion
Here given data is
He gas = 6950 j/mol
We have to find root mean square = ?
So the formula is to find root mean square is
Vrms = √RT/m
Vrms = RMS velocity of the gas
T = absolute temprature of the gas
M = molar mass of the gas
R = universal gas constant
So, average molar kinetic energy of gas
E = 1/2 mv²rms = 1/2 RT
This equation reveal that molar KE is independent of the nature of the gas and it only depends on temprature as ideal behavior is concerned and so both He and O₂ will have same KE = 6950 j/mol and under the same condition of temprature
So for O₂
1/2 m O₂ V²rmsO₂ = 6950 j/mol
Taking atomic mass of O₂ = 16g/mol
V²rmsO₂ = 6950 × 2/2×16g/mol
VrmsO₂ = √69500000/16g/mol
VrmsO₂ = 521.04ms⁻²
Root mean square speed of O₂ gas molecules is 521.04ms⁻²
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Does Cs+ or Ba2+ have a smaller radius
The idea that younger rock layers are deposited on top of older rock layers in an undisturbed section of sedimentary rock can best be explained by which of Steno's principles?
A. principle of superposition
B. principle of original horizontality
C. principle of original lateral continuity
The idea that younger rock layers are deposited on top of older rock layers in an undisturbed section of sedimentary rock can best be explained by the principle of superposition.
Principle of superposition is the major principle of geography. The oldest layer of the rock is consider as a base rock. after the oldest layer the layered formed are in ascending order of younger layer. so, from this principle we can younger and older one.
Thus, The idea that younger rock layers are deposited on top of older rock layers in an undisturbed section of sedimentary rock can best be explained by the principle of superposition.
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What is the wavelength of a radio wave having a frequency of 3.75 x 10^7 Hz?
The wavelength of a radio wave having a frequency is 0.8m.
Radio waves are the longest waves in the electromagnetic spectrum. These waves are a form of electromagnetic radiation with frequencies ranging from 300 GHz to 3 kHz, but above 3 GHz are defined as microwaves. Wave frequency is the number of waves passing through a fixed point in a given time.
calculation:-
frequency = 3.75 x 10^7 Hz?
f = wavelength / speed of light
wavelength = c/f
= 3 × 10^8 / 3.75 x 10^7 Hz
= 0.8 m.
Frequency is the rate at which the current changes direction per second. It is measured in hertz an international unit of measurement where one hertz equals one cycle per second. To calculate the frequency of a wave, divide the velocity of the wave by the wavelength. Write your answer in Hertz or Hz which is the unit for frequency. If you need to calculate the frequency from the time it takes to complete a wave cycle or T the frequency will be the inverse of the time or 1 divided by T.
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A concept can help you translate solutions and related data into basic themes.
A concept can help you translate solutions and related data into basic themes is a false statement.
What does the core idea mean?Basic Concepts are those nouns, verbs, and prepositions that let us understand and describe the world. In the context of the home, kindergarten, and school, these ideas are typically learnt as an essential component of the process of language acquisition.
Therefore, note that Action research is the process of carrying out research and turning the results into useful information that practitioners can use to solve issues and boost organizational effectiveness.
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See full question below
A concept can help you translate solutions and related data into basic themes. True or false
Rose petals contain a variety of different coloured pigments. A student wants to identify these pigments. Explain why
The petal of rose has different kinds of pigments like anthocyanins, carotenoids which give them the colors.
What are Anthocyanins?
Anthocyanins are the pigment that produces red color in the roses. They belong to Flavonoids family.
The pigments in a rose's petals give it its color. These pigments mostly consist of carotenoids and anthocyanins. Bright yellow, orange, and red pigments like those in lemons, oranges, and tomatoes are made by carotenoids. They are contained in structures called plastids, which are a component of the cytoplasm of plant cells. They are therefore steady and largely unaffected by the environment or the health of the plant. Deep red, magenta, purple, and blue colors are made of anthocyanins. They are transported via the sap of the plant and are water soluble. They are far less stable and more susceptible to external variables because they are in a fluid environment.
According to research, a bloom's anthocyanin content and sap pH fluctuate as a flower develops from a bud to a bloom. The pH of the sap increases with bloom aging and anthocyanin content decreases. As those who grow hydrangeas are aware, more acidic conditions prefer the pink/red end of the color spectrum while high alkaline levels produce blue colorations. As a result, as your rose bloom ages and its pH rises, the red will tend to lean toward the darker, bluer side of the spectrum. When a flower is in bloom, anthocyanin levels are still high, but they start to drop off swiftly as the blossom fades.
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what is the relationship between the s-cis and s-trans forms of 1,3-butadiene? multiple choice constitutional isomers different conformations of the same compound diastereomers resonance forms
Answer: The s-cis conformer of 1,3-butadiene is less stable than the s-trans conformer as in the s-cis conformer both the CH2 C H 2 groups are facing in the same direction resulting in a sterically crowded structure that leads to repulsion between the hydrogen atoms attached to C1 and C4
Explanation:
a ripening apple gives off ethylene, which causes nearby apples to begin ripening. those apples then give off ethylene gas, which continues the chain reaction by causing additional apples to ripen. this is an example of
This is an example of positive feedback regulation.
What is positive feedback regulation?A change in a particular direction causes an additional change in the same direction. For example, if the concentration of a substance increases, a feedback of continuously increasing concentration will occur.
A positive feedback loop occurs in nature when a product of a reaction leads to an increase in that reaction. Considering a system in homeostasis, a positive feedback loop pushes the system away from the goal of equilibrium.
Example of Positive Feedback Loops
Fruit Ripening.Childbirth.Blood Clotting.The feedback loop possess two major forms: (1) positive feedback and (2) negative feedback. They work simultaneously to maintain body equilibrium under different conditions.
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Complete and balance the double replacement reaction between calcium acetate and lithium phosphate.
Answer:
2Li3PO4(aq) + 3Ca(C2H3O2)2(aq)
- - - > Ca2(PO4)2(s) + 6LiC2H3O2(aq)