Answer:
Measure so that the line you are reading is even with the center of the meniscus. For water and most liquids, this is the bottom of the meniscus. For mercury, take the measurement from the top of the meniscus. In either case, you are measuring based on the center of the meniscus.
Explanation:
How many moles of Na are needed to
produce 15 moles of NaCl in the reaction
2Na + Cl2 = 2NaCl?
A conversion involving moles of one
substance to moles of another
substance.
Answer:
15 molesExplanation:
15 moles of NaCl will be obtained from 15 moles of Na.
Why do we balance chemichal reactions
Answer:
We balance chemical equations due to the law of conservation of mass, which states that mass can neither be created or destroyed. Therefore, in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products. Balancing equations accounts for the total mass of the reactants and the total mass of the products.
Explanation:
We balance chemical equations due to the law of conservation of mass, which states that mass can neither be created or destroyed. Therefore, in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products. Balancing equations accounts for the total mass of the reactants and the total mass of the products.
Answer:
to satisfy the law of conservation of matter.
the law of conservation states that matter can not be created nor destroyed.
If the density of lead is 11.34g/.what is the density in kg/l
Answer:
0.01134kg
Explanation:
You divide by 1000 to get the kg
An ice freezer behind a restaurant has a freon leak, releasing 41.44 g of C2H2F3Cl into the air every week. If the leak is not fixed, how many kilograms of fluorine will be released into the air over 6 months? Assume there are 4 weeks in a month. mass of fluorine leaked over 6 months
Answer:
994.56
Explanation:
41.44 multiplied by 4, that gives us a month.
Then multiply by 6.
(a) what is the approximate ductility (%el) of a brass that has a yield strength of 230 mpa (33360 psi)?
Based on the calculations, the approximate ductility (%el) of this brass is equal to 2.3%.
Given the following data:
Yield strength = 230 mpa (33360 psi).What is ductility?Ductility can be defined as an important property of a material which determines its ability to become elongated due to the application of stress.
Mathematically, the ductility of a material can be expressed as percentage elongation in length:
[tex]\% el = \frac{\Delta L}{L_i} =\frac{L_f - L_i}{L_i}[/tex]
Where:
[tex]L_i[/tex] is the original length.[tex]L_f[/tex] is the final length.[tex]\Delta L[/tex] is the yield strength.For this exercise, let us assume the original length of this brass is equal to 100 meters.
Substituting the parameters into the formula, we have;
[tex]\% el = \frac{230}{100}[/tex]
Ductility = 2.3%.
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The approximate ductility (%el) of a brass that has a yield strength of 230 mpa is 2.3%.
How do we calculate the approximate ductility?Approximate ductility of any substance will be calculated by using the below equation as:
%el = ΔL / L₁, where
ΔL = yield strength = 230 MPaL₁ = initial length = 100 MPa (assume)On putting this values, we get
%el = 230/100 = 2.3%
Hence 2.3% is the approximate ductility.
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Calculate the volume of 1.5 M nitric acid required to neutralize 30.0 mL of 7.0 M sodium
hydroxide.
HNO3 (aq) + NaOH (aq) → H2O (l) + NaNO3 (aq)
Answer:
0.14 liters nitric acid
Explanation:
Molarity = moles / liter
7.0 M = x / 0.03 L
= 0.21 moles NaOH
0.21 moles NaOH x ( 1 mole HNO3 / 1 mole NaOH) = 0.21 moles HNO3
Molarity = moles / liter
1.5 M = 0.21 moles / x
x = 0.21 moles / 1.5 M
x = 0.14 Liters HNO3
Answer:
[tex]140mL[/tex]
Explanation:
[tex]M_1V_1=M_2V_2[/tex]
[tex]M_1=1.5M[/tex] molarity of nitric acid
[tex]V_1=?[/tex] volume of nitric acid
[tex]M_2=7.0M[/tex] molarity of sodium hydroxide
[tex]V_2=30.0mL[/tex] volume of sodium hydroxide
[tex](1.5M)(V_1)=(7.0M)(30.0mL)[/tex]
[tex]V_1 =\frac{(7.0M)(30.0mL)}{1.5M}=140mL[/tex]
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how are organelles specialized to perform various tasks in a cell?
Answer:
Organelles are structures within a cell that perform specific functions like controlling cell growth and producing energy. Plant and animal cells can contain similar types of organelles. However, certain organelles can only be found in plant cells and certain organelles can only be found in animal cells.
Which particle model diagram represents xenon at stp?
The model that should show the corresct representation of xenon gas is one in which the gas molecules are isolated and monoatomic.
What is a noble gas?A noble gas is a member of group 18 of the periodic table. Noble gases are known not to interact with each other and occur as monoatomic particles.
The images are not shown here hence the question is incomplete. However, we do know that any of the models that show individual monoatomic particles is a representation of xenon gas.
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Which of the following statements is true?
1. The molar mass of Oz is 48 g/mol
2. A 100-gram sample contains at least 2 moles of Oz
3. 48 grams of O3 contains 6. 02 x 1023 molecules of Oz
The molar mass of Oz is 48 g/mol is true.
What is the molar mass of a substance?Molar mass of a substance is the mass of 1 mole of that substance or it is the number of grams per mole of a substance. The units for molar mass is grams/mole.
Therefore,The molar mass of Oz is 48 g/mol is correct because ozone have three oxygen and the molar mass of one oxygen is 16g/mol.
Ozone= 16×3
Ozone=48g/mol.
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Freon-12 synthesized by the reaction between fluoride at carbon tetrachloride and antimony(III)Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride: How many moles each compound (CCL; SbF;, CClFz, and SbCI3) are there if the reaction is |00% complete
Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.
What is the significance of the balanced reaction?A balanced reaction is one where the reactants and products are present in equal amounts, and if the 100% reaction takes place, then the reactant sides have 1 mol of SbF₃ and 3 mol of CCl₄ that make the product of 1 mol of SbCl₃ and 3 mol of CClF₂. After the 100% reaction, all the reactants get converted into the product. The complete reaction is the below.
SbF₃ + 3CCl₄ → SbCl₃ + 3CClF₂
Hence, suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.
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How many moles of hydrochloric acid are in 500. Ml of a 0. 300 m solution?.
Answer:
300
Explanation:
because it's not highly concentrated
Consider the reaction 3CH4(g)→C3H8(g)+2H2(g).
Calculate ΔG at 298 K if the reaction mixture consists of 41 atm of CH4 , 0.013 atm of C3H8 , and 2.3×10−2 atm of H2 .
Given:
ΔH for...
CH4 = -74.8 C3H8 = -103.85 H2 = 0
ΔS for...
CH4 = 0.1863 C3H8 = 0.2699 H2 = 0.13058
ΔG for...
CH4 = -50.8 C3H8 = -23.4 H2 = 0
ΔG at 298 K = 128.9 kJ
From the calculations performed, the free energy change for the reaction is 72 kJ/mol.
What is the equilibrium constant?The equilibrium constant is a value that shows the extent to which reactants have been converted to products.
Given that the equation of the reaction is;
3CH4(g)→C3H8(g)+2H2(g)
Then;
PC3H8 = 0.013 atm
PH2 = 2.3×10−2 atm
PCH4 = 41 atm
Now;
ΔG = ΔG° + RTlnQ
ΔG°reaction = ΔG°products - ΔG°reactants
ΔG°reaction = [( -23.4) +2(0)] - 3(-50.8)
ΔG°reaction = 129 kJ/mol
Q = PC3H8 * PH2^2/PCH4^3
Q = 0.013 * (2.3×10−2)^2/( 41)^3
Q = 6.877 * 10^-6/68921
Q= 9.9* 10^-11
Hence;
ΔG = 129 * 10^3 + [8.314 * 298 * (ln 9.9* 10^-11 )]
ΔG = 129 * 10^3 - 57073
ΔG = 72 kJ/mol
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Given what you observe at the molecular/atomic level, why would surface area have this effect?
Answer:
Increasing the surface area of a reactant increases the frequency of collisions and increases the reaction rate. Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.
Explanation:
:)
Describe how you use two living and two nonliving natural resources every day.
Answer:
Well, if you live on a farm, you have to feed the living animals and when you eat, you use a fork, knife, napkin, chair and those are all nonliving.
Explanation:
Also, if your trying to go on a scavanger hunt, and you pick up an animal then you are interacting with a living resource. Also water can be counted as both because water isnt alive but it can be used on living things. like if you were to drink it or water the plants.
Answer:
I use plant and dog as living things and mobile and dish as non living things everyday.
Explanation:
I use plants to get oxygen, vegetables and herbs and dog to help me to protect my home everyday. similarly, I use mobile to call others and I use dish to eat food everyday.
Which process or processes produce an increase in entropy? i. n2(g) 3h2(g) right arrow. nh3(g) ii. c10h8(g) right arrow. c10h8(s) iii. ch3oh(l) right arrow. ch3oh(aq) i only ii and iii iii only i and iii
Entropy is commonly understood as the system's degree of disorder or unpredictability. The correct option is, (C) (iii) only
What is entropy?Entropy is a thermodynamic number that represents the inability of a system's thermal energy to be converted into mechanical work and is commonly understood as the system's degree of disorder or unpredictability.
The degree of unpredictability of a molecule rises when it transitions from a solid to a liquid state. As a result, the entropy will rise.
Similarly, when we move from a liquid to a gaseous state, the unpredictability of the molecule increases. As a result, the entropy will rise.
However, as we progress from gas to liquid to solid, the degree of molecular randomization reduces. As a result, the entropy will decrease.
Or, to put it another way, the higher the number of moles in a product, the higher the entropy.
(i) [tex]N_2(g)+3H_2(g) \rightarrow 2NH_3(g)[/tex]
Entropy falls in this reaction because the number of moles on the product side is fewer than the number of moles on the reactant side.
(ii) [tex]C_{10}H_8(g) \rightarrow C_{10}H_8(s)[/tex]
Entropy lowers in this process because the degree of randomness of the molecules diminishes as we move from a gas to a solid-state.
(iii) [tex]CH_3OH(l)\rightarrow CH_3OH(aq)[/tex]
Because the methanol liquid dissociated into ions, the number of moles present on the product side is more than the number of moles present on the reactant side, entropy rises in this reaction.
Hence, the correct option is, (C) (iii) only.
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What happens to water when it freezes?
a) it expands.
b) it forms vapor
c) its density increases.
d) its composition changes
Answer:
it expands
Explanation:
Answer:
a) it expands.
Explanation:
Water is more dense when it is a liquid, and less dense as a solid. This is why ice floats above water.
Hence, Ice expands when it freezes.
A nitrogen bubble with a volume of 0.0050 mL forms in the joint of a scuba diver as she ascends rapidly from a pressure of 4.1 atm to the surface, with a pressure of 1.0 atm. What is the volume of the bubble at the surface
As the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.
Boyle's lawBoyle's law states that the volume V of a given quantity of gas is inversely proportional to its pressure P as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given the data in the question;
Initial volume; V₁ = 0.005mL = 5.0 × 10⁻⁶LInitial pressure; P₁ = 4.1atmFinal pressure; P₂ = 1.0atm Final volume; V₂ = ?We substitute our given values into the expression above to find the final volume.
P₁V₁ = P₂V₂
[tex]V_2 = \frac{P_1V_1}{P_2} \\\\V_2 = \frac{4.1atm \ *\ 5.0*10^{-6}L}{1.0atm}\\ \\V_2 = \frac{4.1 \ *\ 5.0*10^{-6}L}{1.0}\\\\V_2 = 2.05*10^{-6}L\\\\V_2 = 0.021mL[/tex]
Therefore, as the scuba diver ascends rapidly to the surface at the given pressure, the volume of the nitrogen bubble at the surface becomes 0.021mL.
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What is the effect Coriolis effect
The Coriolis effect is a natural phenomenon in which objects appear to be deflected as they travel around and above the Earth. The Earth is always rotating, or spinning, from west to east. It completes a full rotation every 24 hours. The Coriolis effect is caused by this rotation.
Which of these describes an ethical dilemma that drug designers could face?
a. whether people should take medicine or if instead they should
seek alternative treatments.
b. a drug lowers blood pressure but can cause severe coughing
spells.
c. a new drug is effective in preventing cancer cells from
reproducing
o d. a drug for blood pressure is absorbed in the colon. it is effective,
but occasionally it can erode the colon walls.
The statement 'whether people should take medicine or if they should seek alternative treatments' describes an ethical dilemma that drug designers face.
What is drug development?Drug development refers to all the processes from target drug identification to drug validation and commercialization.
Drug development involves different stages of development including preclinical and clinical trials.
Ethical dilemmas in drug development include the release of a drug that is ineffective when compared to parallel treatments.
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Answer:
A drug for blood pressure is absorbed in the colon. It is effective, but occasionally it can erode the colon walls.
Explanation:
i just took the test and got it right.... i hope this helps :)
Which is a disadvantage of using chemical indicators? they are expensive to use. they measure ph directly. they must be selected for a narrow ph range. they do not use electricity to operate.
Chemical indicators are the chemical reagents that show the change in reaction by changing color. Chemical indicators must be chosen with a narrow pH range.
What are indicators?Indicators are the solutions or the substances used for the qualitative and the quantitative measurement by a change in color because of the absence or the presence of the sample concentration.
The chemical indicators cannot detect the exact pH and should be used with a narrow range of pH.
Therefore, option C. the narrow range of pH is the disadvantage of chemical indicators.
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Answer:
C (They must be selected for a narrow ph range.
Explanation:
Edg 2022
Determine the mass of sodium acetate necessary to produce 100 ml of an acetate buffer
Explanation:
Ethanoic acid is a weak acid and dissociates:
C
H
3
C
O
O
H
⇌
C
H
3
C
O
O
−
+
H
+
For which
K
a
=
[
C
H
3
C
O
O
−
]
[
H
+
]
[
C
H
3
C
O
O
H
]
=
1.8
×
10
−
5
Please remember that these are equilibrium concentrations .
p
K
a
=
−
log
K
a
=
−
log
[
1.8
×
10
−
5
]
=
4.74
n
=
c
×
v
∴
n
C
H
3
C
O
O
H
=
0.20
×
200.0
1000
=
0.04
what is the molarity of 1 mole of Ba+ in 2 L of water
Answer: 0.5 M
Explanation:
molarity is defined as [tex]\frac{mol}{L}[/tex]
in the question, we are already given the amount of moles of Ba+ and L of water. we can just plug it into the equation, [tex]\frac{1}{2}[/tex].
thus, the molarity will be 0.5 M
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0.5mol/dm3 hydrochloric acid is added gradually to a flask containing 20cm3 of 2 mol/ dm3 sodium hydroxide solution.
What is the total volume, in cm3, of the mixture in the flask when the solution is just neutral?
A 30
B 40
C 60
D 100
Answer:
The answer is B which is 40
From the calculations and the data presented, the total volume in the flask is 100cm^3
What is neutralization?A neutralization occurs between an acid and a base to yiled salt and water only.
The reaction equation here is; HCl + NaOH -----> NaCl + H2O. Now, the volume of HCl used is obtained from;
2 * 20 * 1/0.5 * 1 = 80 cm^3
Total volume in the flask = 80 cm^3 + 20cm3 = 100cm^3
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A student creates a model that displays a cross-section of a metal wire wrapped in plastic insulation. Which statement best describes the metal wire?
A. The metal wire is an element.
B.The metal wire is a compound.
C. The metal wire is a homogenous mixture.
D. The metal wire is a heterogeneous mixture.
Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.
What is an element?An element is a substance or material that cannot be affected by an external substance or cannot be broken down by any reaction.
Metal wire is serving as an element, it should not be easily broken or penetrated as an insulator.
Therefore, Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.
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What change would occur in the mass between the reactants (lead nitrate and potassium iodide) and the products (lead iodide and potassium nitrate)?
Please help me this is coming in my exam. Thank you
Answer:
Pb(NO
3
)
2
+
2
KI
→
PbI
2
+
2
KNO
3
Explanation:
ILL BRAINLIST ITS URGENTTT!!!!
Investigate the rate of success that CCS projects have shown and predict it’s viability as a method of reducing carbon emissions to achieve our target of zero emissions by 2050.
Answer:
With the European Climate Law, the EU committing to carbon neutrality by 2050. What does that mean in practice?
Climate change is already affecting the entire world, with extreme weather conditions such as drought, heat waves, heavy rain, floods and landslides becoming more frequent, including in Europe. Other consequences of the rapidly changing climate include rising sea levels, ocean acidification and loss of biodiversity.
In order to limit global warming to 1.5 degrees Celsius – a threshold the Intergovernmental Panel for Climate Change (IPCC) suggests is safe – carbon neutrality by mid-21st century is essential. This target is also laid down in the Paris agreement signed by 195 countries, including the EU.
In December 2019, the European Commission presented the European Green Deal, its flagship plan that aims to make Europe climate neutral by 2050. This target will be reached through the European Climate Law that sets climate neutrality into binding EU legislation.
Explanation:
ok bet i got u
Balance the chemical equation
Explanation:
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Jesse is riding the bus home from school. He is moving away at 30 miles per hour. From which reference point would this description be correct? A. Jesse's home B. the driver of the bus C. the school D. another student on the bus
Answer:
the correct answer is going to be the school
Balancing chemical equation
Explanation:
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Identify the gas that is generally produced when coal is burnt in the presence of a lot of air.
A. Carbon monoxide
B. Sulphur dioxide
C. Nitrogen dioxide
D. Carbon dioxide
Answer:
Carbon dioxide
Explanation:
The reaction is given by
C+O_2-->C0_2CO2 is a harmful gas also responsible for the global warming and air pollution
When coal is burnt in the presence of excess air, some of the gases produced include carbon dioxide, oxides of nitrogen, and sulfur dioxide.
What are the gaseous products from coal burning?When coal is burnt in the presence of a lot of air, a variety of gases are produced: These include:
Carbon dioxide which is the major productOxides of nitrogenOxide of sulfurAside from carbon dioxide, other gases depend on the content of coal.
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