Please answer the following questions.
Which of the following is true? Select all that apply.
True
True
True
True
False User intent refers to what the user was trying to accomplish by
False A page can have a high Needs Met rating even if it is not related
False The meaning of a query may change over time.
False All queries belong to a locale.
The true statements are
User intent refers to what the user was trying to accomplish by using a search query.The meaning of a query may change over time.The false statements are.
A page can have a high Needs Met rating even if it is not related to the user's search intent. All queries do not necessarily belong toa specific locale. What is the explanation for this ?The true statements reflect accurate concepts in relation to user intent and the dynamic nature of query meanings.
User intent refers to the purpose or goal the user has in mind when conducting a search.
Query meanings can evolve over time due to various factors such as changes in language usage,cultural shifts, or emerging trends. The false statements, on the other hand,do not align with the actual understanding of these concepts.
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In order for a roller coaster to work, why does the hill the cart climbs need to be higher than the top of the loop?
Answer:
Explanation:
At the highest point of the first and tallest slope, your potential energy is at its most elevated it will at any point be on this ride. As you plunge, your potential energy diminishes until it's totally gone at the lower part of the slope." The more limited the slope the exciting ride climbs, the more prominent its active energy.
Another way of saying is that
A roller ride works utilizing gravity. the underlying slope must be sufficiently high that gravity can create sufficient force to finish the course.
Brainliest?
A balloon has a pressure of 3.5atm and a volume of 4.2L. What will the volume of the balloon be if the pressure is increased to 7.0atm? Assume that temperature remains constant. SHOW ALL WORK FOR FULL CREDIT!
The volume of the balloon is 2.1L.
What is volume?Volume is the amount of space the matter occupies. The SI unit of volume is cubic meter.
Using Boyles law equation,
P1V1 = P2V2
Where P1 and V1 are the initial pressure and volume of the gas
P2 and V2 are the final pressure and volume of the gas
Given:
P1 = 3.5atm
V1 = 4.2L
P2 = 7.0atm
V2 = ?
Solve for V2 ,
V2 = P1V1/P2
V2 = (3.5atm x 4.2 L) / (7.0atm)
= 2.1L
Hence, the volume of the balloon is 2.1L.
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It takes 45.60 mL of a 0.225 M hydrochloric acid solution to react completely with 25.00 mL of calcium hydroxide in this reaction below, what is the molar concentration of the calcium hydroxide solution?
2HCl(aq) + Ca(OH)2(aq)!CaCl2(aq) + 2H2O(l)
Given :
It takes 45.60 mL of a 0.225 M hydrochloric acid solution to react completely with 25.00 mL of calcium hydroxide in the given reaction.
2HCl(aq) + Ca(OH)2(aq) --> CaCl2(aq) + 2H2O(l)
To Find :
The molar concentration of the calcium hydroxide solution.
Solution :
From given equation 2 mole of hydrochloric acid react with 1 mole of calcium hydroxide.
So,
[tex]2M_1V_1 = M_2V_2\\\\2\times 0.225 \times 45.60 = M_2 \times 25 \\\\M_2 = \dfrac{20.52}{25}\\\\M_2 = 0.8208 \ M[/tex]
Therefore, molar concentration of the calcium hydroxide solution is 0.8208 M.
Answer:
Molar concentration of the calcium hydroxide solution = 0.2052 M
Explanation:
Volume of HCl = 45.60 mL = 0.0456 L
Molar concentration of HCl = 0.225 M
Volume of Ca(OH)2 = 25.00 mL = 0.025 L
No. of moles of HCl = (0.225 M)*(0.0456 L) = 0.01026 mol
As we know
2 moles of HCl require 1 mole of Ca(OH)2, hence, .01026 moles of HCl will need 0.5*(0.01026) = 0.00513 moles of Ca(OH)2
Molar concentration of Ca(OH)2 = [(0.00513 mol)/(0.025 L)] = 0.2052 M
What are the final units when you have a mass (in grams), and then divide it by molar
mass
Answer:
The final units are mol
Explanation:
The units of molar mass are grams per mole, g/mol.
This means that when dividing mass by molar mass, the units of grams cancel each other, leaving only units of moles:
Grams ÷ Grams/molAnother way of writing that might help is as follows:
[tex]\frac{g}{\frac{g}{mol}}[/tex]Thus, the final units are moles.
What is the mass in grams of 3.40 x 10 24 atoms he
Answer:
Avogadro's constant says that
1
mole of any atom contains
6.022
⋅
10
23
atoms. In this case you have
3.40
⋅
10
22
atoms:
3.40
⋅
10
22
atoms
6.022
⋅
10
23
atoms
mol
=
5.65
⋅
10
−
2
m
o
l
Step 2
The atomic mass of helium (He) will give you the weight of one mole of this molecule:
1
mol =
4.00
gram:
4.00
g
mol
⋅
5.65
⋅
10
−
2
mol
=
0.226
g
So the
3.40
⋅
10
22
helium atoms weigh
0.226
gram
.
Explanation:
Mark as brainlyiest
gases are really _______ and molecules are full of _______, bouncing around constantly
Answer:Gases are really spread out and the atoms and molecules are full of energy - , bouncing around constantly.
Explanation:
.50 ml of a solution are diluted to a volume of 100 ml. The concentration of the diluted
solution is 2 M. What was the concentration of the original solution?
pls answer asap! will mark as brainly ist!!
Answer:
4 M
Explanation:
To answer this problem we can use the following formula:
V₁C₁ = V₂C₂Where the subscript 1 refers to the volume and concentration before diluting, and 2 refers to volume and concentration after diluting.
Meaning that in this case we can write:
50 mL * C₁ = 100 mL * 2 MWe can now solve for C₁:
C₁ = 4 MMarked out of 1.50
A student weights his unknown sample on
uncalibrated balance and obtains a weight of
1.0555 g. If the true weight of the unknown sample
is 1.0755 g, what is the % relative error in his
weight measurements?
+0.94٪
- 1.86%
+1.86%
-0.94
Answer:
+.0.94%
Explanation:
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Thus the % relative error in his weight measurements is +.0.94%.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
The relative mass is the mass that is with respect to mass of a matter that is considered as standard. In chemistry relative mass is equal to the mass of one-twelfth the mass of C-12 isotope .
% relative error=(Difference in weight÷ original weight)×100
Difference in weight= original weight -calculated weight
original weight=1.0755 g
calculated weight=1.0555 g
Difference in weight= 1.0755 g-1.0555 g=0.02g
% relative error=(0.02g÷ 1.0755 g)×100
=+.0.94%
Thus the % relative error in his weight measurements is +.0.94%.
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A reaction vessel for synthesizing ammonia by reacting nitrogen and hydrogen is charged with 5.54 kg of H2 and excess N2. A total of 25.6 kg of NH3 are produced. What is the percent yield of the reaction?
Answer:
81.5
Explanation:
smartworks
determine the kinetic energy of a 1000-kg rollor coaster car that is moving with the speed of 20.0 m/s
Given :
Mass of roller coaster, m = 1000 kg.
Speed with which roller coaster is moving, v = 20.0 m/s.
To Find :
The kinetic energy if roller coaster.
Solution :
We know, kinetic energy of any object of mass m and speed v is given by :
[tex]K.E = \dfrac{mv^2}{2}\\\\K.E = \dfrac{1000\times 20^2}{2}\ J\\\\K.E = 200000\ J\\\\K.E = 200\ kJ[/tex]
Therefore, the kinetic energy of roller coaster is 200 kJ.
Pls someone help me with this question pls
Answer:
D
Explanation:
The addition, removal, or substitution of nitrogenous bases in a DNA molecule may be caused by . Synapsis C. Disjunction B. Hybridization D. Mutation
Answer:
D. Mutation
Explanation:
Mutation is any change or alteration that occurs to the nucleotide sequence of a gene induced during DNA replication or by mutation-causing substances called MUTAGENS.
Mutation can be in the form of addition, removal, or substitution of nitrogenous bases in a DNA molecule. For example, in an original DNA sequence as follows: GAT ATC TGA, the following mutation can occur:
Addition: GAT ATC CTG A
Removal: GAT ATT GA
Substitution: GAT CTC TGA
what is the mass of 3.2 moles of NaCl??
Answer:
116.88554 grams
Explanation:
*sweating profusely*
i had to look it up
Answer:
187.01686400000003 grams
Explanation:
What is the ratio by atoms of elements present in technetium (VII) peroxide? (peroxide
is a polyatomic ion)
1:7
2:8
4:9
3:1
Answer: 1:7
Explanation: 2 Tc^+7 + 7 O2^-2 -> Tc2 (O2)7
Also 2 Tc to 14 O
How did the industrial Revolution impact the population of peppered moths in Britain?
The Industrial Revolution caused the proportions of each color morph in the population to become equal.
The light-colored moths became more common
The dark-colored moths became more common
The Industrial Revolution caused the proportions of each color morph in the population to become unequal
Answer:
due to the pollution the light months tended to stand out against the the wood that was dark due to the smoke the darker months population grew due to the fact that they were more harder to see for the predators
Answer:
The dark colored months became more common
Explanation:
Thats the answer !
Determine the amount of current going through a 50ohms; resistor with a voltage of 120 v
Answer:
98.356 ohms is the answer
What is the lengthening of a muscle without damage? And what is the shortening of a muscle?
Answer:
Stretching is the lengthening and contraction is the shortening
Explanation:
Unless it's asking for eccentric as the stretching and concentric as the shortening
please help me out!! 10 points <3
Answer:it’s b
Explanation:I took. The test and got 100
Answer:
a- i know the other person said that it was b but i looked it but and it seems to be A. whoops-
Explanation:
is copper II nitrate binary or ternary
Answer:
Ternary
Explanation:
A ternary ionic compound is an ionic compound composed of three or more elements. Copper II Nitrate is a ionic compound and contains 3 elements thus making it Ternary
how many molecules of sodium chloride are in 2.5 moles??
Answer:
1.5x1024
Explanation:
what is heat of reaction
Answer:
Explanation:
The heat of reaction is the energy that is released or absorbed when chemicals are transformed in a chemical reaction. ... The heat of reaction or reaction enthalpy is typically expressed as molar enthalpy in kJ/mol or as specific enthalpy in kJ/kg or kJ/L.
Answer:
The heat of reaction is the energy that is released or absorbed when chemicals are transformed in a chemical reaction. ... The heat of reaction or reaction enthalpy is typically expressed as molar enthalpy in kJ/mol or as specific enthalpy in kJ/kg or kJ/L.
Explanation:
Please help ASAP
Identify the atom with the ground-state electron configuration shown for its valence shell.
3s^2 3p^1
Consider a solution which is 0.10M in NH3 and 0.20M in NH4Cl. Choose ALL of the following that are false. If a small amount of NaOH is added, the pH becomes slightly more basic. If HCl is added, the H ions react with the NH3. If a small amount of HCl is added, the pH becomes slightly more basic. If NaOH is added, the OH- ions react with the NH3. If NH4NO3 is added, the pH becomes more basic.
Answer:
The incorrect or the false options are -
(B) - If NH4NO3 is added, the pH becomes more basic.
(D) - If a small amount of HCl is added, the pH becomes slightly more basic.
(E) - If NaOH is added, the OH- ions react with the [tex]NH_3[/tex].
Explanation:
The given solution the buffer basic .
When a small amount of either is added, the hydrogen ion reacts with the ammonium ion, raising the pH slightly.When a small amount of HCl is added, the hydronium ion reacts with the ammonia, raising the pH slightly.Therefore , the options A ( If a small amount of NaOH is added, the pH becomes slightly more basic.) and C ( If HCl is added, the H+ ions react with the NH3.) All other B , D , E are false .
Which of the following environments is most likely to have days with a relative humidity of less than 10% (ten percent)?
a desert
a swamp
a rainforest
a deciduous forest
Answer:
Desert
Explanation:
Desert barely have any water therefore they can barely produce any amount of humidity
does anyone know how to do this?
Answer:
nah
Explanation:
A student dissolves 10.3 g of potassium chloride (KCI) in 200. g of water in a well-insulated open cup. She then observes the temperature of the water fall from 22.0 °C to 19.0 °C over the course of 6.8 minutes.
KCI(8) → K+ (aq) + Cl- (aq)
You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits.
Required:
Is this reaction exothermic, endothermic, or neither?
Answer:
Endothermic.
Explanation:
Hello there!
In this case, it is possible to answer to the requested question "Is this reaction exothermic, endothermic, or neither?" by looking at the temperature change; thus, since the temperature is diminished from 22.0 °C to 19.0 °C, it is possible to realize that the dissociation reaction:
KCI(8) --> K+ (aq) + Cl- (aq)
Is endothermic as it absorbs heat and therefore the solution gets cooled down. Now for any calculation regarding the heat of reaction, it'd be necessary to assume that the solution has a specific heat equal to the water as the former is mostly composed by the latter and the amount of KCl does not modify the solution significantly.
Best regards!
Interpret the following equation for a chemical reaction using the coefficients given:
H2(g) + Cl2(g)-------- 2HCl(g)
On the particulate level:
______ of H2(g) reacts with _______ of Cl2(g) to form two molecules of HCl(g).
On the molar level:
______of H2(g) reacts with _______of Cl2(g) to form two moles of HCl(g).
Answer: 1 molecule of [tex]H_2[/tex] reacts with 1 molecule of [tex]Cl_2[/tex] to give 2 molecules of HCl.
1 mole of [tex]H_2[/tex] reacts with 1 mole of [tex]Cl_2[/tex] to give 2 moles of HCl.
Explanation:
The given balanced reaction is:
[tex]H_2(g)+Cl_2(g)\rightarrow 2HCl(g)[/tex]
On the particulate level :
1 molecule of [tex]H_2[/tex] reacts with 1 molecule of [tex]Cl_2[/tex] to give 2 molecules of HCl.
On molar level:
1 mole of [tex]H_2[/tex] reacts with 1 mole of [tex]Cl_2[/tex] to give 2 moles of HCl.
What process is represented by this redox equation?
C6H12O6 + 602 -> 6H20 + 6CO2
A. Rusting
B. Photosynthesis
C. Cellular respiration
D. Combustion
The redox equation C6H12O6 + 6O2 -> 6H2O + 6CO2 represents the process of cellular respiration. Option C
Cellular respiration is a biochemical process that occurs in living organisms, including plants and animals, to convert organic compounds, such as glucose (C6H12O6), into usable energy in the form of adenosine triphosphate (ATP). It is the primary process by which cells derive energy to carry out their functions.
In the given equation, glucose (C6H12O6) is being oxidized, losing electrons, and releasing carbon dioxide (CO2) as a byproduct. This oxidation process results in the production of energy-rich molecules, such as ATP.
Additionally, oxygen (O2) is being reduced, accepting the electrons from glucose and combining with hydrogen (H) to form water (H2O). This reduction process allows for the transfer of electrons and the generation of energy.
The process of cellular respiration is essential for the survival and functioning of organisms, as it provides the necessary energy for various metabolic activities, growth, and maintenance of cellular processes.
It is a fundamental metabolic pathway found in both plants and animals, enabling them to extract energy from organic molecules through the oxidation of glucose or other fuel sources.
Therefore, option C, cellular respiration, is the correct answer that represents the process described by the given redox equation.
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Which of the following molecules are Polar? Select all that apply.
Group of answer choices
A.CH3Cl
B.HF
C.O2
D.PF5
E.HCN
F.SeBr6
G.H2S