Decreasing the separation between the two magnets will result in increase in the magnetic force between two magnets.
What is a Magnet?This is referred to a substance which produces magnetic field and result in the attraction and repulsion of certain types of things.
Increase in the separation will reduce the magnetic force and vice versa which is why option A was chosen.
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Which of the following is the electron configuration of an atom in the ground state?
(a) 1s2 2s1
(b) 1s2 2s2 2p5 3s2
(c) 1s2 2s1 2p6
(d) 1s1 2s2
Answer:
(a) 1s2 2s1
Explanation:
Electron configurations of atoms are in their ground state when the electrons completely fill each orbital before starting to fill the next orbital.
Understanding the notationIt's important to know how to read and interpret the notation.
For example, the first part of option (a) says "1s2"
The "1" means the first level or shellThe "s" means in an s-orbitalThe "2" means there are 2 electrons in that orbitalOther things to know about electron orbitalsIt important to know which orbitals are in each shell:
In level 1, there is only an s-orbitalIn level 2, there is an s-orbital and a p-orbitalin level 3, there is an s-orbital, a p-orbital, and a d-orbital (things get a little tricky when the d-orbitals get involved, but this problem is checking on the basic concept -- not the higher level trickery)So, it's also important to know how many electrons can be in each orbital in order to know if they are full or not. The electrons should fill up these orbitals for each level, in this order:
s-orbitals can hold 2p-orbitals can hold 6d-orbitals can hold 10 (but again, that's beyond the scope of this problem)Examining how the electrons are filling the orbitalsFor option (a):
the 1s orbital is filled with 2, andthe 2s orbital has a single electron in it with no other orbitals involved.This is in it's ground state.
For option (b):
the 1s orbital is filled with 2, the 2s orbital is filled with 2,the 2p orbital has 5 (short of a full 6), andthe 3s orbital has a single electron in it.Because the 3s orbital has an electron, but the lower 2p before it isn't full. This is NOT in it's ground state.
For option (c):
the 1s orbital is filled with 2, the 2s orbital has 1 (short of a full 2), andthe 2p orbital is filled with 6Although the 2p orbital is full, since the 2s orbital before it was not yet full, this is NOT in it's ground state.
For option (d):
the 1s orbital has 1 (short of a full 2), andthe 2s orbital is filled with 2Again, despite that the final orbital (in this case, the 2s orbital), is full, since the 1s orbital before it was not yet full, this is NOT in it's ground state.
What is the pH of 0.0025M H2SO4
Answer:
pH=2.3
Explanation:
One H2SO4 molecule produce two H+ ions.
So conc. of H+ = 2(0.0025)
=0.005
Now, pH=-log (conc. of H+)
=-log(0.005)
=2.3
6. Give the balanced full reaction and calculate the E° for galvanic cells based on the
following reactions. Draw diagrams indicating; the anode, cathode, flow of electrons,
salt bridge
(a) Zn^2 (aq) + 2e- = Zn(s)
Pb²(aq) + 2e- → Pb(s)
(b) Cr2O7 + 14H + 6e- 2Cr³+ 7H₂O
H₂O2 + 2H+ + 2e- →2H₂O
Electrochemical cell is one in which energy is released by a chemical action.
What is an electrochemical cell?An electrochemical cell is one in which energy is released by a chemical action.
Now we have the reaction;
Zn^2 (aq) + 2e- = Zn(s)
Pb²(aq) + 2e- → Pb(s)
and
Cr2O7 + 14H + 6e- 2Cr³+ 7H₂O
H₂O2 + 2H+ + 2e- →2H₂O
In the first case, the Ecell is obtained from;
(-0.13 V) - (-0.76 V)
= 0.63 V
In the second case;
1.78 V - 1.33 V
= 0.45 V
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Question 34 (1 point)
4.00 moles of Ar gas and 5.00 of Xe gas are added to a flask, giving a total pressure
of 15.00 atm. What is the partial pressure, in atm, due to just Xe gas in this system?
6.67 atm
5.00 atm
9.00 atm
8.33 atm
Answer:
8.33 atm
Explanation:
Xe is 5 out of (4+5) or 5 / 9 ths of the gas present
5/9 * 15 atm = 8.33 atm
Question 19 of 30
Why does Hess's law allow you to determine the enthalpy change of a
reaction?
A. It states that the enthalpy of any reaction can be determined using
a bomb calorimeter.
B. It states that the change in enthalpy is independent of the pathway
the reaction takes to get to the products.
C. It states how the equilibrium constant is related to the enthalpy
change.
D. It states that the change in enthalpy depends on the reaction
pathway between the products and the reactants.
Answer:
B.) It states that the change in enthalpy is independent of the pathway
the reaction takes to get to the products.
Explanation:
Hess's Law states that the overall enthalpy change is the sum of the enthalpy changes of all preceding steps. It does not matter how many steps there are or the type, so long as the enthalpy change of each is combined at the end, the overall change can be determined. The sequence (aka pathway) is not important.
The heat of fusion of water is 79.9cal/g, the heat of vaporization of water is 540cal/g, and the specific heat of water is 1.00cal/deg/g. How much ice at 0 celsius could be converted to steam at 100 celsius by 9522cal of heat?
The amount of ice converted into steam is 13.23 gram.
What is Heat of Vaporisation ?Heat of Vaporisation is the amount of heat required to convert 1 gm to liquid at its boiling point to vapour.
Let x gram of ice is there
At first x gm of ice will melt
The heat required is x * Heat of fusion = x * 79.9 = 79.9x
Then the heat required to rise the temperature of x gm of water from 0 degree to 100 degree Celsius .
= mc ΔT
= x * 1 * 100 = 100x
The heat required to convert x gm of liquid into x gm of steam
= x * 540 = 540x
The total heat supplied is 9522 cal
79.9x + 100x + 540x = 9522
719.9 x = 9522
x = 13.23 gm
The amount of ice converted into steam is 13.23 gram.
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Which of the following best describes a neutralization reaction?
Answer:
A
The H+ from acid and OH- from base forms water, the other parts form the salt.
Balance the following chemical equation:
P4(s)+ O2(g) - P4 O10 (s)
Answer:
The balanced chemical equation is P₄ (s) + 5O₂ (g) → P₄O₁₀ (s)
Explanation:
In order to balance the chemical equation, you first need to see what's out of balance.
In this case our Oxygen is not balanced, so in order to make the two the same, we need to see what coefficient we need to add to the compounds to balance the problem.
So, adding a coefficient of 5 to the O₂ will result in an equal number of oxygen on both sides.
6.67 x 10-3 g of arsenic (As) is found in a 0.600 L sample of water. If the density of this
sample is 1.00 g/mL, what is the concentration of arsenic in ppm?
ppm = mg/L = mg/kg
6.67 x 10⁻³ g = 6.67 mg
ppm = 6.67 mg : 0.6 L = 11.12
? If a weaker solution of sodium bicarbonate was used in beaker b, would that solution require more or less hydrochloric to neutralize it and why?
Answer:
less HCL acid is required to neutralize a weaker solution of base (sodium bicarbonate).
Explanation:
Which one of the atoms shown would most likely form a cation with a charge of +1
The atom present in Option (1) most likely to form cation with a charge of +1
What is a Cation ?
A cation has more protons than electrons, consequently giving it a net positive charge.
For a cation to form, one or more electrons must be lost, typically pulled away by atoms with a stronger affinity for them.
The atoms present in Option 1 have one eletron in its outermost shell therefore, it is easy for the atom to lose one elecron than more electron and to attain stable electronic confiuration.
Hence, The atom present in Option (1) most likely to form cation with a charge of +1
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Which compound is water soluble?
O Li₂S
O PbBr₂
O Au(OH)3
O KCI
Answer:
Li2S is soluble in water
PbBr2 is soluble in hot water
KCI is soluble in water
Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
15.225 - 3.88 =
what is the relationship of work with distance and the force?
The good answer will be marked as brainlist.....
Answer:
Work is the use of force to move an object. It is directly related to both the force applied to the object and the distance the object moves. Work can be calculated with this equation: Work = Force x Distance.
:)
Jon does an experiment in which he varies the amount of calcium chloride (CaCl2) powder used for the chemical reaction with sodium bicarbonate (NaHCO3). He plans to observe whether the amount of CaCl2 powder has an effect on reaction rate.
Make the most logical prediction for the results of his experiment using the drop-down menus.
I predict that using a larger amount of calcium chloride powder will
______
a. increase
b. decrease
c. have no effect on
the reaction rate because the calcium chloride molecules will ______
a. have more kinetic energy
b. balance the number of product molecules
c. collide more often with other reactant molecules
Answer:
a.) increase
c.) collide more often with other reactant molecules
Explanation:
Generally, when you increase the quantity of reactants, the rate of the reaction increases (the forward reaction). When there are more reactants, there are more chances for them to interact with each other. More interactions means more reactions.
I predict that using a larger amount of calcium chloride powder will increase the reaction rate because the calcium chloride molecules will collide more often with other reactant molecules.
When does the reaction rate would increase?It becomes fair to assume that the reaction rate would increase when Jon increases the quantity of calcium chloride (CaCl2) powder utilised in the chemical reaction with sodium bicarbonate (NaHCO3).
This is due to the fact that adding more calcium chloride powder to the reaction mixture will add more CaCl2 molecules.
There will be more collisions between CaCl2 and NaHCO3 molecules due to the larger concentration of CaCl2 molecules. Successful collisions between reactant molecules are essential for the production of products in a chemical reaction.
Therefore, a greater reaction rate will result from more CaCl2 and NaHCO3 molecules colliding often. The additional molecules contribute to a higher number of energetic collisions, where the reactant particles possess sufficient energy to overcome the activation energy barrier and undergo the reaction.
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Describe the subatomic structure of the nucleus, including the structure of each nucleon. Draw a picture. Describe the forces that hold the nucleus together and draw them on your diagram. Explain how beta emission works.
The nucleus of the atom is the heaviest part of the atom.
The nucleus consists of neutrons and protonsBoth neutrons and protons have masses, but only protons have chargesThe nucleus contains all the positive charges of an atomThe mass of an atom is the sum of the numbers of protons and neutrons in a nucleusWhen the ratio of neutrons to protons is too high, the nucleus becomes unstable and Beta emission has to take place.
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The buildup of sediment where a river empties into a slow-moving or nonmoving body of water is known as a/an
A type of soil made almost entirely of windblown sediment is called _______.
The _______ in soil comes from decaying plants and animals and their waste products.
_______, which is made up of tiny particles and drains water very poorly, is one of the main components of soil.
A type of soil called peat is most likely to form in a/an
Water helps in the development of soil by carrying _______ and nutrients from upper layers to lower layers.
The _______ of nutrients from soil is common in wet environments, like rain forests.
Quartz-rich parent material leads to the development of _______ soils.
The layers of soil composed mainly of organic matter are known as the ______ and _______ horizon.
A layer of soil in which clay, iron, and other elements from the overlying soil accumulates is known as the _______ horizon, or subsoil.
ANSWERS:
river delta.
loess
organic matter
Clay
swamp (or wetland).
minerals
leaching
sandy
O and A
B
The buildup of sediment in which a river empties right into a slow-transferring or non transferring frame of water is referred to as a Delta.
What is Delta ?Deltas are wetlands that shape as rivers empty their water and sediment into some other frame of water, together with an ocean, lake, or some other river.
A form of soil made nearly completely of windblown sediment is referred to as Loess.
The natural count number in soil comes from decaying flora and animals and their waste products.
Clay, that's made of tiny debris and drains water very poorly, is one of the essential additives of soil.
A form of soil referred to as peat is maximum probably to shape in a/an Coastal surroundings in Tropical placing.
Water enables withinside the improvement of soil with the aid of using carrying Mineral and vitamins from higher layers to decrease layers.
The Richness of nutrients from soil is not unusualplace in moist environments, like rain forests.
Quartz-wealthy determine cloth results in the improvement of Sandy soils.
The layers of soil composed specifically of natural count number are referred to as the O and A horizon.
A layer of soil wherein clay, iron, and different factors from the overlying soil accumulates is referred to as the B horizon, or subsoil.
Delta is stated to be a frame of sediments deposited whilst a river flows into a status water, together with the ocean or a lake.Loess are wind blown deposits of silts and clay composed of quartz, feldspar and different minerals . Loess dominantly have excessive porosity.Organic subjects compose specifically of stays of animal and flora . After this flora and animals dies they shape natural count number that provides to soil vitamins.Clayey soil represent very tiny debris which have a bad draining cappotential because of it tiny bad spaces .Tropical placing in a coastal surroundings affords the important environments for soils like peat to shape . It has plentiful of plant stays . Moreover peat is the primary degree of coal formation, containing wet and unconsolidated plant substances.Minerals part of what help withinside the improvement of the soil .And additionally it is carried right all the way down to the earth with the aid of using water thru a procedure referred to as Leaching.Richness of nutrient are not unusualplace in tropical surroundings which are moist and help plentiful life.Sandy soil are fashioned from dad and mom substances containing minerals together with feldspar and quartz.Horizon O and A are referred to as topsoil and are specifically compose of animal and flora stays and big quantity of minerals.The subsoil or B Horizons consists of mineral together with irons , clay minerals because of percolation from the pinnacle soils and it has a tendency to build up here(subsoil).Learn more about Horizon here ;
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1. A balloon contains 100g of oxygen gas (O₂) when the volume is 110 dm³. Find the volume of the balloon when the mass of oxygen gas is decreased to 50g. [take O=16] 1. A balloon contains 100g of oxygen gas ( O₂ ) when the volume is 110 dm³ . Find the volume of the balloon when the mass of oxygen gas is decreased to 50g . [ take O = 16 ]
The volume of the balloon when the mass of oxygen gas is decreased to 50g is 50L.
We will use the ideal gas equation-
PV=nRT
P=Pressure
V=volume
n=no. of moles
T=temperature
In this question temperature and pressure will remains constant then the above equation can be rewritten as-
[tex]V_{1} /n_{1} =V_{2} /n2[/tex]
where V1= initial volume of the balloon
V2= volume of the balloon when the mass of oxygen gas is decreased to 50g
now, substitute the values in the above equation-
V1=100dm3=100Ln1=100/32=3.12n2=50/32=1.56100/3.12=V2/1.56
V2=50 Lhence, the volume of the balloon when the mass of oxygen gas is decreased to 50g is 50L.
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An atom of elements x has one more shell of electrons than an atom of beryllium,but h are s one less valence electron then beryllium.which element is element X?
Element X is sodium.
If there is one more shell of electrons, then this means it is one period below.
Since there is one less valence electron, it is one group to the left.
How many grams S03
are needed to make 400g
H₂So4 in 49%
160 g of SO3 are needed to make 400 g of 49% H2SO4.
How many grams of SO3 are required to prepare 400 g of 49% H2SO4?The equation of the reaction for the formation of H2SO4 from SO3 is given below as follows:
[tex]SO_{3} + H_{2}O \rightarrow H_{2}SO_{4}[/tex]
1 mole of SO3 produces 1 mole of H2SO4
Molar mass of SO3 = 80 g/mol
Molar mass of H2SO4 = 98 g/mol
80 g of SO3 are required to produce 98 og 100%H2SO4
mass of SO3 required to produce 400 g of 100 %H2SO4 = 80/98 × 400 = 326.5 g of SO3
Mass of SO3 required to produce 49% of 400 g H2SO4 = 326.5 × 49% = 160 g
Therefore, 160 g of SO3 are needed to make 400 g of 49% H2SO4.
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A hot air balloon is filled with 1.89 x 10² liters of air at 21°C. If atmospheric pressure does not change,
how hot must the air become in order to increase the volume to 4.5 x 10² liters?
Answer:
7.0k x 10^2k
Explanation:
Determine the mass of SO₂ that contains 6.075 × 10^26 S atoms.
Answer:
= 64584.7176 g
or
= 64.5847 kg
Explanation:
From our question, we have been asked to find the mass of SO₂ containing 6.075 × 10^26 S atoms.
We know that from Avogadro's constant,
1 mole of a substance contains 6.02 x 10²³ ions/atoms/units
Thus,
1 mole => 6.02 x 10²³ atoms
x moles=> 6.075 × 10²⁶ atoms
We cross multiply;
x moles = (6.075 × 10²⁶ x 1)/(6.02 x 10²³)
= 1009.1362 moles
1 mole of SO2 = 64 g
1009.1362 moles = ?
=>
[tex] \frac{1009.1362 \times 64}{1} [/tex]
= 64584.7176 g
= 64.5847 kg
Which of the following stage is also known as the unstable stage?
a.Transient creep stage
b.Constant creep stage
c.Fracture stage
d.Steady stage creep stage
Transient stage is also called the unstable stage and in this stage, there is a gradual decrease in deformation rate to a definite constant value.
What is Transient stage ?A transient state is when a process variable or variables changes, but before the system reaches a steady state.
Transient time is the time it takes for a circuit to change from one steady state to the next.
Therefore, Transient stage is also called the unstable stage and in this stage, there is a gradual decrease in deformation rate to a definite constant value.
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How many orbitals are contained in the third principal level (n = 3) of a given atom?
The third principal level(n=3) of a given atom has 9 orbitals.
what are orbitals?
orbitals are different energy sub-levels.orbitals are of 4 types.each orbital has a unique and different shape.four types of orbital are-s, p, d, fThe 3rd electron shell has 3 subshells - 3s, 3p, 3d
s subshell only has one orbital.p subshell has three orbitals.d subshell has five orbitals.therefore, the total number of orbitals in the third electron shell is:
1+3+5=9 orbitals
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Calculate how many grams of the product form when 16.7 g of calcium metal completely reacts. Assume that there is more than enough of the chlorine gas.
Ca(s) + Cl2(g) → CaCl2(s)
39.96 g product form when 16.7 g of calcium metal completely reacts.
What is the stoichiometric process?Stoichiometry is a section of chemistry that involves using relationships between reactants and/or products in a chemical reaction to determine desired quantitative data.
Equation:
[tex]Ca(s) + Cl_2(g)[/tex] → [tex]CaCl_2(s)[/tex]
In this case, for the undergoing reaction, we can compute the grams of the formed calcium chloride by noticing the 1:1 molar ratio between calcium and it (stoichiometric coefficients) and using their molar mass of 40 g/mol and 111 g/mol by using the following stoichiometric process:
[tex]m_{ca_C_l_2}[/tex]= 16.7 g Ca x [tex]\frac{1 mol \;of \;Ca}{40g Ca}[/tex] x [tex]\frac{1 mol \;of \;CaCl_2}{1 mol \;Ca}[/tex] x [tex]\frac{111g of \;CaCl_2}{1 mol \;CaCl_2}[/tex]
[tex]m_{ca_C_l_2}[/tex] = 39.96 g
Hence, 39.96 g product form when 16.7 g of calcium metal completely reacts.
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Of protons, neutrons, and electrons, the least massive particle is the electron.is it True or False
The least massive particle is the electron. Hence, the option true is correct.
What are subatomic particles?Sub-atomic particles are tiny particles of matter that together constitute an atom. There are three subatomic particles, which are namely electrons, protons and neutrons.
Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron).
Hence, the option true is correct.
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Question 5 of 30
Which best describes a gamma ray that is given off during nuclear decay?
A. High-energy electromagnetic waves
B. A stream of small, positively charged particles
C. Low-energy electromagnetic waves
D. A stream of small, negatively charged particles
Gamma rays are high-energy electromagnetic waves given off during nuclear decay; option A.
What are electromagnetic waves?Electromagnetic waves are waves which are produced as a result of the interaction of the magnetic and electric fields.
Types of electromagnetic waves include gamma rays, radio waves, ultraviolet waves.
Gamma rays are high-energy electromagnetic waves given off during nuclear decay
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What is the balanced form of the chemical equation shown below?
C₂H5OH() + O₂(g) → H₂O(A) + CO₂(g)
Answer: C(2)H(5)OH + 3O(2) —> 3H(2)O + 2CO(2)
Explanation:
*The number in parentheses or
( ) represents the subscript of the element
Carbon-2
Hydrogen-6
Oxygen-7
I hope this is helpful.
How many moles of HCl are needed to react with 0.87 moles of Na?
A:0.87 mol HCl
B:0.82 mol HCl
C:1.0 mol HCl
D:0.96 mol Na
The moles of HCl are needed to react with 0.87 moles of Na are the A:0.87 mol HCl.
How do you calculate moles of HCl?M = mol / L Calculate the molarity of an HCl answer which includes 18.23 g of HCl in 355. zero mL of answer. Calculate the wide variety of moles of HCl. Divide the wide variety of moles of HCl with the aid of using the overall quantity in liters.
We'll start with the aid of using writing the balanced equation for the reaction. This is illustrated below:Na+HCl->NaCl +H From the balanced equation above, 1 mole of Na reacted with 1 mole of HCI.Finally, we will decide the wide variety of moles of HCI required to react with 0.87 moles of Na. This may be acquired as illustrated below:From the balanced equation above,1 mole of Na reacted with 1 mole of HCI.Read more about the moles ;
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How many valence electrons will a Cl- ion have?
Answer:
8
Explanation:
im pretty sure it'll be 8 electrons
