Answer: option C - The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell
Explanation:
Meiosis is also known as REDUCTIVE DIVISION, simply because a parent cell with diploid number of chromosome (46) is divided into four daughter cells with haploid number of chromosome (23)
Thus, ONLY option C correctly defines meiosis
At the end of meiosis, produced cells contain half the number of chromosomes as the parent cell. Option C is correct.
Meiosis:
It is division in which cell divide into 4 haploid daughter cells.
The daughter cells are haploid.Haploid means cell have half of number the chromosome of its parent.It is found in the germ cells to produce the sperm and ovum.Therefore, at the end of meiosis, produced cells contain half the number of chromosomes as the parent cell.
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The volume of gas is 250mL at 355kPa. What will the volume be when the pressure is reduced to 76.0kPa?
Answer:
V₂ = 1167.8 mL
Explanation:
Given data:
Initial Volume of gas = 250 mL
Initial Pressure = 355 KPa
Final pressure = 76.0 Kpa
Final volume = ?
Solution:
P₁V₁ = P₂ V₂
V₁ = Initial volume
P₁ = Initial Pressure
V₂ = Final volume
P₂ = Final Pressure
Now we will put the values in formula.
P₁V₁ = P₂ V₂
V₂ = P₁V₁ / P₂
V₂ = 355 KPa 250 mL / 76.0 Kpa
V₂ = 88750 mL / 76.0
V₂ = 1167.8 mL
Why do some chemical reactions occur?
Answer:
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products
Chemical reactions occur when atoms in reactants form new products, leading to changes in energy and entropy. Factors like temperature, concentration, and the use of catalysts influence the rate and spontaneity of reactions.
Chemical reactions transpire when atoms in the reactants rearrange their chemical bonds to form products. This rearrangement leads to a change in total energy, as the new bonds have different energy levels compared to the original bonds in the reactants. There are several reasons and conditions under which chemical reactions occur:
Energy Changes: All chemical reactions involve changes in energy. Reactions may either absorb energy (endothermic) or release energy (exothermic), and these energy changes can be a driving force for the reaction to occur.Entropy: Another driving force for chemical reactions is entropy, which is essentially the measure of disorder within a system. Reactions may occur to increase entropy.Reaction Rates: Conditions like temperature, concentration of reactants, and the presence of catalysts can affect the rate at which reactions occur. Higher temperatures and concentrations generally increase reaction rates, while catalysts lower the activation energy needed for the reaction to take place.Spontaneity and Activation Energy: Some reactions occur spontaneously due to favorable energy and entropy conditions while others require the input of energy to overcome an energy barrier known as activation energy.In summary, chemical reactions occur due to the reorganization of atoms to form more stable or favorable products, driven by changes in energy and entropy and influenced by various factors that affect reaction rates.
C2H4O2 + NaC2H3O2 + H2O + CO2 list the reactants in this chemical reaction
Answer:
C₂H₄O₂ and NaC₂H₃O₂ are reactants.
Explanation:
Word equation:
Acetic acid + sodium acetate → sodium diacetate
Chemical equation:
C₂H₄O₂ + NaC₂H₃O₂ → C₄H₇NaO₄
This is a synthesis reaction in which simple reactants combine to form complex product.
This is also balanced chemical equation because there are equal number of atoms of all elements on both side of equation. Thus it follow the law of conservation of mass.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
Select the best answer for the question.
13. Which statement accurately describes the relationship between mass and weight?
A. An object with twice the mass of another object will weigh twice as much
B. An object with twice the mass of another object will weigh four times as much.
C. An object with twice the mass of another object will weigh half as much.
OD. An object with twice the mass of another object will weigh one-fourth as much.
Mark for review (Will be highlighted on the review page)
Answer: the correct option is A.
Explanation:
Weight = Mass X Acceleration due to gravity(10m/s2)
If A has a mass of 4Kg and the mass of B is twice that of A. Then their weight will be :
For A:
W = 4 x 10 = 40N
For B:
Mas of B is two times that of A i.e
2 x 4 = 8kg
W = 8 x 10 = 80N
Comparing the weight of A and B it is clear that the weight of B is also twice the weight of A
Through which of the following ways can heat be transferred?
A.
by direct or indirect contact between objects at different temperatures
B.
only by direct contact between objects at different temperatures
C.
Heat can never be transferred between objects.
D.
only by indirect contact between objects at different temperatures
Answer:
The correct option is:
A) by direct or indirect contact between objects at different temperatures
Explanation:
Heat can be transferred in three different methods:
Conduction, Convection and Radiation
Conduction is heat transfer through direct contact between substances at different temperatures.
Convection is the heat transfer which takes place through air currents.
Radiation is the heat transfer that does not require contact between two objects.
Hence, heat transfer can take place through direct or indirect contact between objects at different temperatures.
What is the oxidation state of S in so ??
Answer:
+2
Explanation:
If a compound [tex]SO[/tex] existed, we would identify the oxidation state of sulfur using the following logic:
oxygen is more electronegative than sulfur, so it's more electron-withdrawing and it should have a negative oxidation state producing a positive oxidation state for sulfur;oxygen typically has an oxidation state of -2;we may then apply the fact that SO is expected to be a molecule with a net charge of 0;if the net charge is 0 and the oxidation state of oxygen is -2, we may set the oxidation state of S to x;write the equation for the net charge of 0 by adding all individual charges of the two atoms: [tex]x + (-2) = 0[/tex];hence, x = 2.That said, in this hypothetical compound S would have an oxidation state of +2.
how many atoms of oxygen are in 4.6 grams of copper sulfate
Answer:
m(CuSO4×5H2O)=424.0 g
M(CuSO4×5H2O)=249.68 g/mol
n=m/M
n(CuSO4×5H2O)=1.7 mol
There are 9 atoms of oxygen in each formula unit of CuSO4×5H2O. Therefore,
n(O)=8.5 mol
M(O)=16 g/mol
m=M×n
m(O)=135.6 g
Explanation:
aaaaaaa help me with chemistry
Bases:
are generally proton acceptors
produce OH− ions in solution
are electron pair donors
may include all of these characteristics
Answer:
Of course :may include all of these characteristics
Because all answers are correct :they react with acids that have H+ ions and they all have OH- ions so they can be electrons donors and produce these ions in solution
:)
Answer:
The answer is may include all of these characteristics.
Explanation:
In chemistry, the term bases is used to describe substances that release hydroxide ions in aqueous solution. They are also generally proton acceptors as well as electron pair donors. Some examples of them are the hydroxides of the alkali metals and the alkaline earth metals. Due to this, the correct answer is letter D.
Do liquids expand when they freeze
Answer:
most liquids do expand when they freeze
Explanation:
water is actually one that expands and there are probably many more too
i hope this helps you
Final answer:
Water expands when it freezes, which could cause up to 30% of cells to burst in frozen human bodies, thereby posing significant challenges to the concept of cryopreservation. This expansion force also necessitates antifreeze in engines and causes pipes to burst if they freeze.
Explanation:
Most liquids typically contract when they freeze, but water is an exception to this rule. Water expands by about 9% when it freezes, which can lead to significant damage in biological cells. This occurs because ice crystals grow as water solidifies, leading to an increased volume. If human bodies were to be preserved by freezing, the same force that can fracture boulders and engine blocks would cause up to 30% of cells to burst. Consequently, when considering the possibility of preserving human bodies for future revival, extensive cell damage due to the expansion of water upon freezing poses a considerable challenge.
This expansion of water upon freezing underpins the need for antifreeze in engines and the prevention of pipe bursts during cold weather. Furthermore, the unique property of water expanding instead of contracting upon freezing allows ice to float, creating an insulating layer on bodies of water that preserves aquatic life in colder environments.
HELP! Can two different species occupy the same niche at the same time? Why or why not?
A. Yes, but they would eventually evolve into one species.
B. No, they would compete for all necessary resources.
C. Yes, as there are always some small differences.
D. No, as they will both go extinct.
Answer:
The correct option is B ) No, they would compete for all necessary resources.
Explanation:
In ecology, a niche can be described as the role that an organism plays in a community or ecosystem. The niche of a species describes what food a particular organism eats, the place it lives, the place it reproduces and the relationship it has with other organisms of the community.
If two species belong to the same niche at a time, then they will fight for resources between them. As a result, one of the species will have to move from the place. One of the species might become get killed due to competition. Hence, two different species cannot belong to the same niche at a time.
Copper produces a green flame test. When is the green light emitted?
Answer: When you burned the skewer tip coated with copper sulfate the green light is emitted
Explanation:
when the copper is burned it makes a green light
In which grouping of the periodic table do the elements have similar properties?
only columns
both rows and columns
only rows
in the periods
Answer:
only columns
Explanation:
All atoms of elements present in same group or column having same number of valance electrons. Thus the elements in same group having same properties.
For example:
Consider the second group. It consist of alkaline earth metals. There are six elements in second group. Beryllium, magnesium, calcium, strontium, barium and radium.
All have two valance electrons.
Electronic configuration of Beryllium:
Be = [He] 2s²
Electronic configuration of magnesium.
Mg = [Ne] 3s²
Electronic configuration of calcium.
Ca = [Ar] 4s²
Electronic configuration of strontium.
Sr = [Kr] 5s²
Electronic configuration of barium.
Ba = [Xe] 6s²
Electronic configuration of radium.
Ra = [ Rn] 7s²
They are present in group two and have same number of valance electrons (two valance electrons) and show similar reactivity.
They react with oxygen and form oxide.
2Ba + O₂ → 2BaO
2Mg + O₂ → 2MgO
2Ca + O₂ → 2CaO
this oxide form hydroxide when react with water,
BaO + H₂O → Ba(OH)₂
MgO + H₂O → Mg(OH)₂
CaO + H₂O → Ca(OH)₂
With sulfur,
Mg + S → MgS
Ca + S → CaS
Ba + S → BaS
Pb(CH3COO)2 + H2S → PbS + CH3COOH (Need to balance equation)
How many grams of PbS is produced when 5.00g of H2S is reacted with an excess (unlimited) supply of Pb(CH3COO)2?
Answer:
Mass of PbS = 9.26 g
Explanation:
Data Given :
mass of H₂S = 5.00 g
mass of PbS = ?
Reaction Given:
Pb(CH₃COO)₂ + H₂S ----→ PbS + CH₃COOH
Solution:
Balance the equation:
Pb(CH₃COO)₂ + H₂S ----→ PbS + 2CH₃COOH
Now Look for the number of moles of H₂S and PbS meta
Pb(CH₃COO)₂ + H₂S ----→ PbS + 2CH₃COOH
1 mol 1 mol
So,
1 mole of H₂S combine with excess (unlimited) supply of Pb(CH₃COO)₂ and produce 1 moles of PbS
Now Convert moles to mass for which we have to molar masses of H₂S and PbS
Molar mass of H₂S = 2 + 32 = 43 g/mol
Molar mass of PbS = 31 + 32 = 63 g/mol
Pb(CH₃COO)₂ + H₂S -------→ PbS + 2CH₃COOH
1 mol (34 g/mol) 1 mol (63 g/mol)
34 g 63 g
So,
34 g of H₂S produces 63 grams of PbS.
Now
What mass of silver is produced from 5 g of H₂S
Apply unity formula
34 g of H₂S ≅ 63 g of PbS
5 g of H₂S ≅ X g of PbS
By doing cross multiplication
Mass of PbS = 63 g x 5 g / 34 g
Mass of PbS = 9.26 g
To balance the given equation, add a coefficient of 2 in front of CH3COOH. 0.147 mol of PbS is produced, which is equal to 35.19 g of PbS.
Explanation:To balance the given equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Let's start by counting the number of atoms for each element in the given equation:
Pb: 1 on both sidesH: 6 on both sidesC: 4 on both sidesO: 2 on the reactant side and 4 on the product sideS: 1 on the reactant side and 1 on the product sideFrom the above counts, we can see that the number of oxygen atoms is not balanced. We can balance the equation by adding a coefficient of 2 in front of CH3COOH:
Pb(CH3COO)2 + H2S → PbS + 2CH3COOH
Now, the equation is balanced, and we can calculate the number of grams of PbS produced. From the balanced equation, we can see that 1 mole of PbS is produced for every 1 mole of H2S reacted. The molar mass of H2S is 34.08 g/mol, so 5.00 g of H2S is equivalent to 5.00/34.08 = 0.147 mol. Therefore, 0.147 mol of PbS is produced, which is equal to 0.147 x 239.36 = 35.19 g of PbS.
I NEED HELP! IDK IF IT’S C or D?????
Answer:
option D : when ΔH is positive and ΔS isnegative
Explanation:
The answer will be explained by the following equation for the gibbs free energy
G = H - TS
Where
G = gibbs free energy
H = enthalpy of a system (heat
T = temperature
S = entropy
So the change in the gibbs free energy at constant temperature can be written as
ΔG = ΔH - TΔS . . . . . . (1)
Where
ΔG = Change in gibbs free energy
ΔH = Change in enthalpy of a system
ΔS = Change in entropy
During a spontaneous reaction the energy given in the form of heat that is ΔH or spontaneous due to disorder of the system that is ΔS are the driving forces of gibbs free energy.
Gibbs free energy is a state function and the change in gibbs free energy is equal to the change in enthalpy minus product of temperature and change in entropy as shown in equation 1
ΔG = ΔH - TΔS . . . . . . (1)
From the above equation it is obvious that ΔG will be positive for any reaction for which ΔH is positive and ΔS is negative. when ΔG is positive the reaction will be non spontaneous and unfavorable.
So,
option D is correct: when ΔH is positive and ΔS is negative
According to the following position vs. Time graph the bicyclist was
A) moving at a constant speed for the first 2 seconds, then began to speed.
B) not moving for the first 2 seconds, then begin moving and continue to gain speed.
C) slowing down for the first two seconds, then begin moving at a constant speed.
D) not moving for the first two seconds, then begin moving at the constant speed.
Answer:
According to the following position vs. Time graph the bicyclist was : D
D. Not moving for the first two seconds, then begin moving at the constant speed.
Explanation:
[tex]Speed = \frac{Distance}{time}[/tex]
Along Y-axis = Distance in meters
Along X-axis = Time taken in second
For first 2 seconds the The object has not changed its position.There is Zero distance covered.So , Speed = 0After 2 second,The Object changed the distance by equal amount in equal interval of time.(Uniform Speed).Hence at each point after 2 second, there is same value speed9.(02.02 MC)
Ben wrote the following examples of changes in substances.
Example A: Vegetables are chopped.
Example B: Food is broken up into simpler form during digestion.
Which statement is correct? (1 point)
Both are examples of physical changes
Both are examples of chemical changes
Example A describes a physical change and Example B describes a chemical change.
Example A describes a chemical change and Example B describes a physical change
Answer:
Example A describes a physical change and Example B describes a chemical change.
Explanation:
Physical Change
The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.
These changes were reversible.
They have same chemical property.
These changes can be observed with naked eye.
Example :
Vegetables are chopped and converted into smaller pieces the composition remain same. It is physical change.
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
Food is broken up into simpler form during digestion and convert into the energy and particles which are different from original compound .
Answer:
Example A describes a physical change and Example B describes a chemical change.
Explanation:
PLEASE HELP.
A charged particle in an accelerated motion produces EM radiation.
In an atom the electrons have accelerated motion.Does it means that all electrons in atoms produce EM wave???
Answer:
Yes. all the accelerating charged electron particles produces the Electromagnetic wave.
Explanation:
Magnetic fields are produced during the movement of the charged particle. the magnetic field produced, will exert some force in the moving charges. The electric field as well as the magnetic field travelling in the empty space with respect of speed of light are the electromagnetic wave. Moving electron will always produce the magnetic field and thus the electrons motion are constant,but when the acceleration starts the electromagnetic waves are being radiated.
which of the following isotopes has the same number of neutrons in sulfur-32
An isotope having the same number of neutrons as Sulfur-32 would have a mass number of 32 and atomic number of 16. This is because S-32 has an atomic number of 16 (16 Protons) and mass number of 32 resulting in 16 Neutrons (32-16).
Explanation:To find the isotope that has the same number of neutrons as sulfur-32, you must look at the atomic number and mass number. An isotope is an atom with the same number of protons but different numbers of neutrons. Sulfur-32 has an atomic number of 16, so it has 16 protons. Its mass number, 32, is the total of the protons and neutrons. This means, it has 16 neutrons (32-16 = 16). So, any isotope with a mass number of 32 and atomic number of 16 has the exact same number of neutrons as sulfur-32.
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Carbon (C): 1s(H)2s(I)2p(J)
What is H, I, and J equal?
Answer:
H =2; I = 2; J = 2
Explanation:
Carbon is element 6 in the Periodic Table.
Start at element 1 (H) and count from left to right until you reach element 6 (C).
You get the electron configuration
C: 1s² 2s²2p².
Thus,
H =2; I = 2; J = 2
Answer:
H=2
I=2
J=2
Explanation:
i took this warm up
Why is it useful to model systems that use energy?
Answer:
Energy modelling can be described as a system to make simulations or computerized models of systems which use energy. This makes it easier to analyze and access such systems which use energy. By this approach, there are lesser chances for the energy to be wasted and fewer chances for any energy-related experiments to go wrong. As such kind of experiments can be dangerous hence it is essential that models be made first.
16. What is the density of lead if a cube measuring 2 cm per side has a mass of 90.8 g?
The density of lead if cube measuring 2 cm per side has a mass of 90.8 g is 11.35 g/cm^3
Explanation:
Density is equal to mass is divided by volume.
It is given that mass of 90.8 grams
we can find the volume of cube by height multiplied by width multiplied by depth.
Because all sides of cube are of same length.
Volume just ends up being 2^3
(2 cm)^3 = 8 cm ^3
Now plug both of these numbers into density equation
ρ =m/v
=90.8 g / 8 cm ^3
=11.35 g/cm^3
What is the name of the part of a plant cell where water and sunlight are used ?
Answer:
Chloroplasts
Explanation:
Chloroplasts is an organelle found only in plants and eukaryotic algae that captures sunlight and converts that energy into food.
Answer:
chloroplasts
Explanation:
i searched this
You need to make 500.0 mL of a 2.2 M solution of K SO, How many grams of K SO,
do you need?
Explanation:
you're already have a molarity in Question
Molarity M = numer of moles (n) / Volume (Liter)
first you must convert ml to L > 500 ml = 0.5 L
so 2.2 = n / 0.5
n = 2.2 × 0.5 = 1.1 moles
now you are already have number of moles and from the question you have K2O and you can calculate Molecular weight for K2O
K=39
O=16
Mw = 2×39 + 16 = 94
now you can calculate how gram do you need from
number of mole = mass (g) / molecular weight for k2o
so => 1.1 = mass / 94
mass = 1.1 × 94 = 103.4 g
good luck
Assume you have 28.0 grams of nitrogen and 5.0 grams of hydrogen what is the limiting reactant
Answer:
Hydrogen is the limiting reagent.
Explanation:
Limiting Reagent : It is the substance that get consumed when the reaction complete. It is used to determine the what amount of product will be formed.
When [tex]H_{2}[/tex] and [tex]N_{2}[/tex] react, it will produce
[tex]NH_{3}[/tex] gas . The balance reaction can be written as:\
[tex]N_{2}(g) + 3H_{2}(g) \rightarrow 2NH_{3}(g)[/tex]
Here, 1 mol [tex]N_{2}[/tex] require 3 mol [tex]H_{2}[/tex]
In question ,
[tex]moles = \frac{given\ mass}{Molar\ mass} [/tex]
Molar mass of H2 = 2 g/mol , given mass = 5 g
[tex]moles\ of\ H_{2} = \frac{5}{2}[/tex]
[tex] H_{2}[/tex] = 2.5 mole
[tex]moles\ of\ N_{2} = \frac{28}{28}[/tex]
Molar mass of N2 = 28 g/mol , given mass = 28 g
[tex] N_{2}[/tex] = 1 mole
Since, 1 mole [tex]N_{2}[/tex] require 3 mole [tex]H_{2}[/tex]
But available , mole of [tex]H_{2}[/tex] = 2.5
So we need extra 0.5 moles of Hydrogen gas
Hence [tex]H_{2}[/tex] get consumed first , Thus Hydrogen is the limiting reagent
5. Which of the following correctly shows alpha decay?
ABU --> Ra + Be
a U --> NP + Be
can U --> Th + He
D ESU --> Pu + He
Answer:
U --> Th + He
Explanation:
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴
-
69. A 1 mol sample of gas has a temp of 225K, a vol of 3.3L, and a pressure of 2000 torr
What would be the temperature if the amount of
stant while pressure
drops to 900 torr and volume to 2.75L?
2
co
20
s
C
Answer:
T₂ = 84.375 K
Explanation:
Given data:
Initial volume = 3.3 L
Initial pressure = 2000 torr
Initial temperature = 225 K
Final temperature = ?
Final volume = 2.75 L
Final pressure = 900 torr
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
P₁V₁/T₁ = P₂V₂/T₂
T₂ = P₂V₂ T₁ /P₁V₁
T₂ = 900 torr× 2.75 L× 225 K / 2000 torr×3.3 L
T₂ = 556875 K/ 6600
T₂ = 84.375 K
Thich of the following is a chemical property2
12. Which of the following is a chem
color
b. hardness
C. freezing point
d. ability to react with oxygen
Answer:
"Freezing point and ability to react with oxygen" are chemical properties
Explanation:
The change of liquid into solid is the freezing point. The melting point is more than the freezing point in certain cases of mixtures for certain organic compounds like fats. As soon as the mixture freezes it becomes solid and which results in change in the composition from the liquid and solid in this way the it drastically reduces the freezing point. The melting point gets higher due to the pressure. This happens due to the release of heat of which results in the rise of temperature to the freezing point .Also the reaction of elements with oxygen which leads to formation of new substance is also an chemical property
Help I need to turn this in!! What is A for CIO3-, the chlorate ion?
Answer:
A = is for central atom = Cl = 1
N = is the total number of lone pair of electron = 2
Explanation:
AXN for ClO3- is
A = 1 = 1 Cl
X = 3 ( X = the number of particles attached = O3 = 3 )
N = 1 lone pair of electron
The value for A, which is the chemical compound CIO⁻₃ for the chlorate ion is 24.
How to solve for ATo find A, we add the number of valence electrons contributed by each atom:
A = Valence electrons of Cl + Valence electrons of O + Charge of the ion
A = 7 + 18 + (-1) (since the chlorate ion has a charge of -1)
A = 7 + 18 - 1
A = 24
The A value for the chemical compound CIO⁻₃ a chlorate ion is given as 24
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Solid crystals with _____ bonds are the best insulators. metallic covalent ionic hydrogen
Answer: covalent bond
Explanation: covalent bonded compounds do not conduct electricity. Hence, they are used as insulators
80cm^3 of oxygen gas diffused through a porous hole in 50 seconds how long wiil it take 120cm^3 of nitrogen (iv) oxide to diffuse through the same hole at the same conditions ?
Answer: it will take 89.93secs
Explanation:Please see attachment for explanation