Answer:- choice d is correct. Sr<Ca<Be .
Explanations:- Br, Ca, and Sr are all elements of same group as they all have 2 valence electrons. As we move down in a group, a new shell is being added that increases the size of the atom. As the size of an atom increases, it is easy to remove the electron from it's outer most shell in it's gaseous state. Since, Be is above Ca and Ca is above Sr. The size increases in the order, Be < Ca < Sr. It means Be is the smallest one of them and so it's hard to remove from it's outer most shell and hence it's ionization energy is higher.
Sr is largest one in these three elements and so it's easy to remove outer most electron from it that means the ionization energy is least. Ca is between Be and Sr.
So, an increasing order of ionization energy is Sr<Ca<Be . Choice D is correct.
Answer:
D.
Sr < Ca < Be
Explanation:
PLATO
7.602x1024 atoms of lead has a mass of ____________ grams.
(Enter just the number for this one.)
Hello!
To find the mass of 7.602 x 10^24 atoms of lead, we need to find the number of moles first, then we will be able to find the mass. To find the moles, we need to divide the total number of atoms by Avogadro's number, which is 6.02 x 10^23. Also, one mole of lead is equal to it's atomic mass, which is 207.2 grams.
1). Find the number of moles
(7.602 x 10^24) / (6.02 x 10^23) ≈ 12.62790
Using significant figures, there are 12.8 moles of lead.
2). Find the mass of lead
12.8 moles x 207.2 grams = 2652.16 grams
Using significant figures, the mass of the given amount of lead is 2650 grams. (Exact value is 2652.16 grams).
Which of the following electron configurations correspond to an atom with an electron in an excited state?
(A) [Ne]3s23p4
(B) [Ne]3s13p6
(C) [He]2s22p3
(D) [Kr]5s24d85p1
(E) [Ar]4s23d8
The correct answer is option (B) [Ne]3s¹3p⁶.
The electron configuration of Cl is [Ne]3s²3p⁵ in the ground state.
The electron configuration of Cl is [Ne]3s¹3p⁶ in the excited state.
In the excited state one electron from the 2s orbital jumps to the 2p orbital. As a result the 2p orbital becomes completely filled with 6 electrons and the 2s orbital is partially filled with only 1 electron. To be completely filled a p and a s orbital can have a maximum of 6 and 2 electrons respectively.
Thus [Ne]3s¹3p⁶ electron configuration correspond to an atom with an electron in an excited state.
Computers are capable of inductive reasoning. True False
Most substances can exist as a gas, a liquid or a solid. These are called different ___ of matter.
How does energy from the sun affect the motion of molecules in a gas compared to molecules in a liquid? (2 points)
Molecules in a gas move faster than in a liquid.
Molecules in a gas move slower than in a liquid.
Molecules in a solid and gas move at about the same speed.
The sun does not affect the energy in liquids and gases.
The molecules in a gas move faster than in a liquid.
A 46.9 gram sample of a substance has a volume of about 3.5 centimeters3. It is solid at a room temperature of 23ºC. Out of the four substances whose properties are given, which is the most likely identity of this substance?
Substance Density (g/cm3) Melting Point (°C) Boiling Point (°C)
molybdenum 10.28 2,623 4,639
mercury 13.53 -39 357
hafnium 13.31 2,233 4,603
lead 11.34 327 1,749
A.
molybdenum
B.
mercury
C.
hafnium
D.
lead
Answer:- C. Hafnium.
Solution:- Mass of the sample is 46.0 g and it's volume is [tex]3.5cm^3[/tex] .
From mass and volume, we can calculate it's density using the formula:
[tex]density=\frac{mass}{volume}[/tex]
[tex]density=\frac{46.9g}{3.5cm^3}[/tex]
[tex]density=\frac{13.4g}{cm^3}[/tex]
On the basis of the density, this substance could either be mercury or hafnium. Since the substance is a solid at room temperature where as mercury is liquid. So, it can't be mercury.
The right choice is C) Hafnium.
Answer:
the one above me
Explanation:
Which statement correctly describes how sound energy is transferred when a whale makes a sound underwater? A. Water particles are not squeezed together or pulled farther apart. B. Water particles are squeezed together but not pulled farther part. C. Water particles are squeezed together and pulled farther apart. D. Water particles are pulled farther apart but not squeezed together.
I think the answer is B because Sound travels about 1,500 m/s underwater, and sound travels about 332 m/s in air. Sound underwater travels faster and longer in water. The particles are more tightly packed together, so sounds travel faster through water.
Please help me ASAP
1. As an object moves towards another object the sound waves bunch up.
True Or False
2. As an object moves toward another object the sound waves have lower frequency. True or False.
3. As an object moves toward another object the sound waves have lower frequency. True or False
4. Faster sources moving towards an object have higher pitch than slower moving sources.
True or False
5. An object moving away will it have a lower pitch.
True or False
6. Lower shows differences in frequency as color.
True or False
7. An object moving away to be blue shifted.
True or False
8. Is a star that shows as blue shifted moving toward the observer.
True or False.
9. Faster moving objects shows MORE shift in frequency.
True or False
10. Galaxies appear to be redshifted fom observing on Earth. Is this because they are moving towards the earth.
True or False.
Most of these questions relate to the Doppler Effect - how the frequency of sound and light waves changes depending on whether the source is moving towards or away from the observer. Moving toward an observer leads to higher frequencies and a 'blue shift' while moving away leads to lower frequencies and a 'red shift'.
Explanation:1. As an object moves towards another object the sound waves bunch up. True. This is a representation of the Doppler Effect where the frequency appears to change when a source of sound is moving relative to the observer.
2. As an object moves toward another object the sound waves have a lower frequency. False. As the object moves closer, the sound waves will have a higher frequency.
3. As an object moves toward another object the sound waves have a lower frequency. False as explained in the question.
4. Faster sources moving towards an object have a higher pitch than slower-moving sources. True. Faster moving sources will cause the sound waves to bunch up leading to higher frequency and hence greater pitch.
5. An object moving away will have a lower pitch. True. The pitch will appear to be lower as the sound waves are spread out.
6. Lower shows differences in frequency as color. This sentence is not clear enough to provide an accurate response.
7. An object moving away to be blue-shifted. False. An object moving away shows a red shift; a blue shift occurs when an object is moving toward the observer.
8. Is a star that shows as blue-shifted moving toward the observer. True. The blue shift indicates that a cosmos object is moving towards us.
9. Faster-moving objects show MORE shifts in frequency. True. The frequency of light waves will change more noticeably with faster-moving objects due to the Doppler effect.
10. Galaxies appear to be redshifted from observing on Earth. Is this because they are moving towards the earth? False. Galaxies are moving away from the Earth which is why they appear redshifted.
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Cathy conducts a scientific investigation. How can she make sure her results are valid? A. repeat the investigation several times B. confirm that her results match her hypothesis C. write a report about her results D. use metric measuring units during her investigation Pls Help Me....... It's Science By the way.
A. repeat the investigation several times. You must repeat an experiment to make sure it is valid.
Answer:
the answer is A
Explanation:
express in scientific notation (6.0x10^4) (3.1x10^-1)
The Answer is: 1.86×10^4
Answer:
1.86 x 104
Explanation:
This mathematical operation is a multiplication, so:
1.- Multiply the number as usual: 6 x 3.1 = 18.6
2.- Multiply the coefficients, remember since they coefficients, a multiplication, actually you need to add them: 4 + (-1) = 3+
3.- Then you write the number with the coefficient: 18.6 x 103
4.- In this case since the scientific notation just admit one number will be:
1.86 x 104
suppose that 0.05 g of NaHCO3 reacts with 0.05 g of HCI and the reaction bubbles due to the carbon dioxide being produced. if the substance produced are 0.04 g water and 0.03g of salt how many grams if carbon dioxide gas were produced
The balanced chemical equation for the given reaction:
NaHCO₃ + HCl --> NaCl + H₂O + CO₂
Given, mass of NaHCO₃ = 0.05 g
Molar mass of NaHCO₃ = 84.007 g/mol
Moles = mass/molar mass
Moles of NaHCO₃ = 0.05 g/84.007 g/mol
Moles of NaHCO₃ = 6.0 x 10⁻⁴
Given, mass of HCl = 0.05 g
Molar mass of HCl = 36.46 g/mol
Moles of HCl = 0.05 g/ 36.46 g/mol
Moles of HCl = 1.4 x 10⁻³
Since NaHCO3 has the least number of moles, it is the limiting reagent.
As per the balanced equation the molar ratio between NaHCO₃ : CO₂ is 1:1
Therefore, moles of CO₂ = 6.0 x 10⁻⁴
Molar mass of CO₂ = 44 g/mol
Mass = moles x molar mass
Mass of CO₂ = 6.0 x 10⁻⁴ mol x 44 g/mol = 0.0264 g
Mass of carbon dioxide gas produced = 0.0264 g
Question 1 (True/False Worth 4 points) (03.06 LC) An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.
True False
Question 2(Multiple Choice Worth 4 points) (03.06 LC) What type of intermolecular force occurs between all substances?
Covalent bonding
Hydrogen bonding
Ion-dipole force
London dispersion force
Question 3(Multiple Choice Worth 4 points) (03.06 MC) When comparing H2, NH3, O2, and CH4, which of the following statements is correct?
CH4 has the highest boiling point because it experiences dipole-dipole forces.
H2 has the strongest intermolecular forces because it has the lowest mass. NH3 has the highest boiling point because it experiences hydrogen bonding.
O2 has the strongest intermolecular force because it experiences London dispersion forces.
Question 4(Multiple Choice Worth 4 points) (03.06 MC)
The boiling points of diatomic halogens are compared in the table.
Boiling Points of Diatomic Halogens Molecule Boiling Point
F2 −188 °C
Cl2 −34 °C
Br2 59 °C
I2 184 °C
Which of the following statements best explains the trends in boiling points?
The atomic size increases down the group, and this decreases the strength of the intermolecular forces.
The total number of electrons decreases down the group, and this decreases the strength of the intermolecular forces.
The total number of electrons increases down the group, and this increases the strength of the intermolecular forces.
The chances of forming a permanent dipole increase down the group and this increases the strength of the intermolecular forces.
Question 5(Multiple Choice Worth 4 points) (03.06 MC) What is the strongest intermolecular force that occurs between molecules of CO2?
Dipole-dipole
Induced dipoles
Ionic bonding
London dispersion
PLEASE HELP ASAP 30 POINTS...WILL MARK BRAINLIEST
Answer:
The correct answers are (1) True (2) London dispersion force (3) one of the option is missing, none of these three is an answer (4) The total number of electrons increases down the group, and this increases the strength of the intermolecular forces (5) London dispersion forces which are always present.
Explanation:
Given: An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.
Answer: True
when the electrons moving in a molecule or an atom move towards one end of the molecule or atom the other end has a small positive pole at that time and the end where electrons move has a small negative pole. So, a dipole is formed for that instant.
(2) What type of intermolecular force occurs between all substances?
Answer: London dispersion force
remember from first part how an instantaneous dipole is formed. When a pole is formed at that instant the molecule in neighborhood can interact with the dipole that was formed. The dipole that was formed has a positive pole and a negative pole. If the neighboring molecule is present near positive pole it’s electrons will get attracted to the positive pole of the dipole. This interaction is called London dispersion force. Since every atom or molecule or ion in the universe has electrons, so there is development of instantaneous dipole in each of them and each one of them has London dispersion force acting on them.
(3) When comparing [tex]H_2,\;NH_3,\;O_2,\; \rm{and}\;{CH_4[/tex] which of the following statements is correct?
Answer: one of the option is missing, none of these three is an answer.
(4)The boiling points of diatomic halogens are compared in the table.
Answer: The total number of electrons increases down the group, and this increases the strength of the intermolecular forces.
(5) What is the strongest intermolecular force that occurs between molecules of [tex]CO_2[/tex]?
Answer: London dispersion forces which are always present.
London forces are weakest forces, if other forces would have been present then we would have ignored London forces but since no other forces are present, the only choice is London forces.
[tex]CO_2[/tex] is a non polar molecule, it does not have permanent dipole moment. So there are no chances of dipole-dipole, [tex]CO_2[/tex] doesn’t have a positive or negative charge so even not ionic bond.
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Chemical properties
a) Can be observed without altering the identity of a substance
b). include mass and color
c) Include changes that alter the identity of a substance
d) Include changes of state of a substance
plz explain why too so i can actually learn it!!
Chemical properties include characteristics that describe how a substance changes its chemical structure or composition, as in the case of flammability. The correct answer is c) Include changes that alter the identity of a substance, because chemical properties lead to chemical changes, which result in new substances with different identities.
The chemical properties of a substance refer to the characteristics that describe its ability to undergo specific chemical changes that alter its identity. For instance, the flammability of a substance is a chemical property because when a substance burns, it produces new substances with different chemical compositions. Observing a chemical property involves causing a chemical change.
a) Can be observed without altering the identity of a substance: This statement describes a physical property, not a chemical property.
b) Include mass and color: These are examples of physical properties, not chemical properties.
c) Include changes that alter the identity of a substance: This statement correctly defines a chemical property.
d) Include changes of state of a substance: Changes of state, such as melting or freezing, are physical changes, not chemical changes.
Therefore, the correct answer is c) Include changes that alter the identity of a substance, because chemical properties involve changes in the chemical structure or composition of a substance, such as its reaction to form new substances.
Examine the scenario.
A sports car starts from rest and uniformly accelerates to a speed of 60 km/h in 6 s. The car moves east the entire time.
Which option represents a vector quantity present in the scenario?
acceleration: 10 km/h/s east
speed: 60 km/h
velocity: 10 km/h/s east
distance: 60 km
Answer;
-Acceleration: 10 km/h/s east
Explanation;
-The quantity is either a vector or a scalar. Scalars are quantities that are fully described by a magnitude (or numerical value) alone while Vectors are quantities that are fully described by both a magnitude and a direction.
Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.
In this case , a =( v-u)/t ; where a is the acceleration, v is the final velocity, u is the initial velocity and t is time.
a = (60 - 0)/6
= 10 km/h/s
Final answer:
In the scenario, the vector quantities are 'acceleration: 10 km/h/s east' and 'velocity: 10 km/h/s east' since they include both magnitude and a direction, unlike the scalar quantities 'speed: 60 km/h' and 'distance: 60 km', which lack direction.
Explanation:
In the provided scenario of a sports car accelerating uniformly, the quantity that represents a vector is acceleration: 10 km/h/s east and velocity: 10 km/h/s east. Both these quantities include both magnitude and direction. In contrast, 'speed: 60 km/h' is a scalar as it only specifies magnitude and does not include direction. Similarly, 'distance: 60 km' is also a scalar quantity because it states how far the car has traveled without a specific direction.
Vector quantities are defined by both magnitude and direction, which is the case with the acceleration and velocity specified 'east' in this scenario. Scalar quantities, such as speed and distance, only have magnitude without any reference to direction.
Which equation represents the reaction of a weak acid with water?
A.
HCl + H2O H3O+ + Cl-
B.
HCO3– + H2O H2CO3 + OH–
C.
H2O H + + OH-
D.
HCOOH + H2O H3O+ + HCOO-
Answer: The correct answer is Option D.
Explanation:
Weak acid is defined as the acid which does not completely dissociates into its ion when dissolved in water.
For the given options:
Option A: [tex]HCl+H_2O\rightarrow H_3O^++Cl^-[/tex]
HCl is a strong acid because it completely looses its proton when dissolved in water.
Option B: [tex]HCO_3^-+H_2O\rightarrow H_2CO_3+OH^-[/tex]
Hydrogen carbonate ion is a base because it is easily accepting a proton from water.
Option C: [tex]H_2O\rightarrow H^++OH^-[/tex]
The above equation represents the ionization of water.
Option D: [tex]HCOOH+H_2O\rightarrow H_3O^++HCOO^-[/tex]
Formic acid is considered as a weak acid because it does not completely dissociates into its ions when dissolved in water.
From the above information, the correct answer is Option D.
Sodium carbonate is often used in certain candies to create fizzy bubbles when solid weak acids in the candy are dissolved with saliva. Explain the fizzing effect.
Answer is: in chemical reaction with with weak acid, sodium carbonate produce carbonic acid (H₂CO₃), which decomposes into carbon(IV) oxide (fizzy bubbles) and water.
Balanced chemical reaction:
Na₂CO₃ + 2HClO → CO₂(g) + H₂O + 2NaClO.
Chemical decomposition is the separation of a carbonic acid into water and carbon dioxide: H₂CO₃ → CO₂ + H₂O.
The Earth's biosphere is consists of A. The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life. B. Only the water on Earth that is in its solid form. C. The solid part of the earth consisting of the crust and outer mantle. D. All of the Earth's water, including surface water, groundwater, snowcover, ice, and water in the atmosphere.
Answer:
The answer is A: the part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life.
Explanation:
i got it on study island and make sure you copy this "the part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life." and do ctrl f and paste and check where your answer is because the answer might be shuffled hope you have a great day!! :)
The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life. Thus option A is correct.
What are the composition of atmosphere ?The atmosphere is a gas that cover the a planet and is present in place by the gravitational force of the planet, the temperature of the atmosphere is low.
The atmosphere is composed of nitrogen (78%), oxygen (21%), argon (0.9%), carbon dioxide (0.04%) and trace gases, variable amount of water vapor are also present .
Carbon dioxide gas is responsible mainly for the greenhouse effect, transparent to the incoming solar radiation but is opaque to the outgoing terrestrial radiation.
Dust particles are present in the atmosphere, these particles act as hygroscopic nuclei around which water vapor condenses to produce clouds.
Thus option A is correct.
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The burning of the magnesium becomes uncontrolled (it burns brightly). oops! will the reported mole ratio of magnesium to oxygen be too high or too low as a result of this technique error? explain.
Answer:
The answer is Less oxidation will happen while its consuming, so the proportion to O² to magnesium would be substantially higher than common.
Explanation:
At the point when decrease happens, a component picks up electrons and its oxidation number declines or is diminished. To decide whether a red ox response has happened and to distinguish the component oxidized and the component decreased: Assign oxidation numbers to all iotas in the equation.In ionic and free extreme responses, oxidation and decrease are characterized as procedures by which a component experiences a net misfortune or gain of electrons, separately. ... In reference to natural particles, oxidation is a procedure by which a carbon iota picks up bonds to more electromotive components, most usually oxygen.
Uncontrolled burning of magnesium leads to more oxygen being consumed than that needed for a perfect stoichiometric reaction. Hence, this would result in the mole ratio of magnesium to oxygen to be reported lower than it would be if the magnesium burning was controlled. The reaction with other substances like nitrogen or carbon dioxide can also influence the mole ratio.
Explanation:If magnesium burns uncontrolled, it will consume more oxygen than required for the stoichiometric reaction with magnesium. As a result, the mole ratio of magnesium to oxygen will be reported lower than it actually is. In the reaction 2Mg(s) + O2(g) → 2MgO(s), one mole of oxygen reacts with two moles of magnesium. However, if magnesium burns uncontrollably, it will react with more than the required amount of oxygen.
Thus, an abundance of oxygen implies a decrease in the mole ratio of magnesium to oxygen. Apart from this, an uncontrollable burning of magnesium might lead to its reaction with nitrogen or carbon dioxide, which can further lower the reported mole ratio of magnesium to oxygen.
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How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 4.46 atm and 45°C in the reaction shown below?
Hey there!:
Temperature in kelvin : 45 + 273 => 318 K
Number of moles H2:
p * V = n * R * T
4.46 * 0.579 = n * 0.082 * 318
2.58234 = n * 26.076
n = 2.58234 / 26.076
n = 0.09903 moles of H2O
Given the reaction:
XeF6(s) + 3 H2(g) → Xe(g) + 6 HF(g)
Molar mass XeF6 = 245.3 g/mol
0.09903 mol H2O * ( 1 mol XeF6 / 3 mol H2 ) * 245.3
= 8.09 g of XeF6
Hope that helps
189.5 g of aluminum has _______ moles of aluminum.
(Enter just the number for this one.)
Hello!
To find the number of moles in the given amount of aluminum, we need to know the mass of one mole of aluminum, and divide that by the given amount of aluminum.
One mole of aluminum is equal to about 27 grams. With that, we can divide it by the given amount of aluminum.
198.5 grams / 27 grams ≈ 7.35185185
According the number of significant figures, there are about 7.4 moles of aluminum in 189.5 grams of aluminum.
Which of the following represents radiant energy being converted to chemical energy?
a. A plant uses energy from the sun to make sugar stored in fruit.
b. A slingshot is used to shoot a rock across the room.
c. A lamp lights up after it is plugged into an outlet in the wall.
d. A rock sitting at the top of a hill is pushed down the hill.
calculate the standard enthalpy of combustion. The standard enthalpy of formation of sucrose is - 2226.1kj/mol
that would be 2226.109837560 sorry if i'm wrong have a nice day.
The question is incomplete, here is the complete question:
Calculate the standard enthalpy of combustion of sucrose. The standard enthalpy of formation of sucrose is -2226.1 kJ/mol
Answer: The standard enthalpy of combustion of sucrose is -5636.52 kJ
Explanation:
Combustion reaction is defined as the chemical reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide gas and water molecule.
[tex]\text{Hydrocarbon}+O_2\rightarrow CO_2+H_2O[/tex]
Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. The equation used to calculate enthalpy change is of a reaction is:
[tex]\Delta H^o_{rxn}=\sum [n\times \Delta H_f^o_{(product)}]-\sum [n\times \Delta H_f^o_{(reactant)]}[/tex]
The chemical equation for the combustion of sucrose follows:
[tex]C_{12}H_{22}O_{11}(s)+12O_2(g)\rightarrow 12CO_2(g)+11H_2O(l)[/tex]
The equation for the enthalpy change of the above reaction is:
[tex]\Delta H^o_{rxn}=[(12\times \Delta H_f^o_{(CO_2)})+(11\times \Delta H_f^o_{(H_2O)})]-[(1\times \Delta H_f^o_{(C_{12}H_{22}O_{11})})+(12\times \Delta H_f^o_{(O_2)})][/tex]
We are given:
[tex]\Delta H_f^o_{(H_2O)}=-285.8kJ/mol\\\Delta H_f^o_{(CO_2)}=-393.51kJ/mol\\\Delta H_f^o_{(C_{12}H_{22}O_{11})}=-2226.1kJ/mol\\\Delta H_f^o_{(O_2)}=0kJ/mol[/tex]
Putting values in above equation, we get:
[tex]\Delta H^o_{rxn}=[(12\times (-393.51))+(11\times (-285.8))]-[(1\times (-2226.1))+(12\times (0))]\\\\\Delta H^o_{rxn}=-5636.52kJ[/tex]
Hence, the standard enthalpy of combustion of sucrose is -5636.52 kJ
Which water cycle processes might be responsible for helping to clean/ filter the water? Explain.
to be as exact as i can it is all of them they all work together to make water good.
Would someone please help me with my chemistry? Thank you
Because it is just simply bigger a na is way way smaller than a ci.
Ionic radii of cations:
When you form a metal cation, you are removing the outermost electrons and revealing the inner core.
For example, to form an Na⁺ ion you must remove a 3s electron from an Na atom, exposing the 2s and 2p subshells.
The n = 2 shell is smaller than an n= 3 shell, so an Na⁺ ion is smaller than an Na atom (as in the image below).
Ionic radii of anions:
When you form an anion, you are adding electrons to the outermost shell. These electrons (a) increase the shielding from the nucleus and (b) repel all the other electrons.
The decreased nuclear attraction and the electronic repulsions cause the electron cloud to expand, so a Cl⁻ ion is larger than a Cl atom.
Which statement best describes a protein?
A) a polymer made up of 100 or more amino-acid monomers
B) a polymer made up of 3000 or more glucose monomers
C) a polymer made up of 100 or more glucose monomers
D) a polymer made up of 20 or more amino-acid monomers
Final answer:
A protein is best described as a polymer made up of 20 or more amino acid monomers, with proteins varying greatly in size and function.
Explanation:
The correct statement that best describes a protein is (D) a polymer made up of 20 or more amino-acid monomers. Proteins are essential biomolecules within living organisms, made from building blocks known as amino acids, which are connected by peptide bonds forming long chains. There are 20 standard amino acids that can combine in various sequences to form a vast array of proteins, each with unique functions and properties. These proteins can be as small as a few dozen amino acids to several thousand in the larger proteins.
help please chemistry question
Answer:
D. [tex]K_{a} = \frac{[\text{H}^{+}][\text{NO}_{2}^{-}]}{[\text{HNO}_{2}]}[/tex]
Explanation:
The general form of an equilibrium constant expression is
[tex]K = \frac{[\text{Products}]}{[\text{Reactants}]}[/tex]
In the equilibrium
HNO₂ ⇌ H⁺ + NO₂⁻
The products are H⁺ and NO₂⁻, and the reactant is HNO₂.
∴ [tex]K_{a} = \frac{[\text{H}^{+}][\text{NO}_{2}^{-}]}{[\text{HNO}_{2}]}[/tex]
A substance did not change its chemical nature in a reaction. Which most likely describes the reaction?
A)It was heated.
B)It was hit with a hammer.
C)It was placed in a salt solution.
D)It was frozen.
The answer is D. It was frozen.
This is because freezing an object doesn't change chemical properties, only change the state of the matter.
Without what do carbohydrates fats and proteins can not be changed into energy
vitamins is the answer to your question
How many valence electrons are in an atom of strontium (Sr)? Consult the periodic table. A. 5 B. 2 C. 47.90 D. 22
The smallest and the basic particle of a chemical element is said to be an atom. It is made up of three subatomic particles that is electrons, protons and neutrons. The neutrons and protons are present in the nucleus of an atom whereas electrons are present in the orbits around the nucleus of the atom. There are several shells in the orbital depending on the atomic number. The electrons which are present in the outermost shell are said to be valence electrons.
They can be determined by the electronic configuration of the element.
The atomic number of strontium, [tex]Sr[/tex] is 38. The electronic configuration of strontium, [tex]Sr[/tex] is:
[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}[/tex]
From the electronic configuration it is clear that the outermost shell of strontium, [tex]Sr[/tex] is [tex]5s[/tex]. So, the number of valence electrons in strontium, [tex]Sr[/tex] is 2.
Hence, there are 2 valence electrons in an atom of strontium ([tex]Sr[/tex]).
The number of valence electrons are in an atom of strontium (Sr) is 2 and the correct option is option B.
Atomic number is the number of protons present in the nucleus of an atom. It is always equal to the number of electrons in orbit about that nucleus (in a nonionized atom). Thus, all atoms that have the same number of protons--the atomic number--are atoms of the same element.
The modern periodic table is arranged in such a way that all the elements have an increasing atomic number, and subsequently, increasing mass number.
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An experiment requires you to fill a test tube with hydrochloric acid. Find the bottle of acid and pour the contents into the test tube.
A. True
B. False
Answer: Option (A) is true.
Explanation:
In a laboratory, the solutions are prepared in advance so that as and when the need arises they can be easily available. As these solutions are prepared by keeping in mind the correct ratio of concentrations.
Hence, when a person need to fill a test tube with hydrochloric acid then he/she just need to find the bottle of acid and pour the contents into the test tube.
Thus, it can be conclude that the statement is true.
Answer: True
Explanation:
In a laboratory if someone needs a test tube full of hydrochloric acid then it should be directly poured into the test tube.
As required in the experiment or during the experiment, the hydrochloric acid is pored and used in the experiment.
During the time of experiment the concentration of HCl can be adjusted base on the type of experiment.
So, it is true that hydrochloric acid can be poured directly in the test tube from the bottle.