Answer:
D is the answer!Explanation:
Using Charles's Law to solve this question: V1/T1 = V2/T2
V1 = 2.24L
T1 = 52C (covert to Kelvin by plus 273.15) = 325.15K
V2 = 1.66L
T2 = ?
V1/T1 = V2/T2 must change to V2×T1/V1 = T2
1.66 x 325.15/2.24 = V2
V2 = 240.96K ≈ 241K
A 50 mL sample is held at 100 kPa. What pressure does it exert when the gas is compressed to 40 L.
Who's Law did you use?
Newton's third law
Explanation:
2N₂ + 5 0₂2 N₂O5 What mass of nitrogen is required to react with 5.04 grams of oxygen?
Answer:
1.76g of N
Explanation:
5.04g x 1mol/16mol x 2mol/5mol x 14.01g/1mol = 1.76g
Pls help me on this question and I will grant 100 points and brainly mark for the first 5 correct answers. Also I need it ASAP
Answer:
Explanation:
i) Red as Methyl orange shows red color in acidic medium and hyrdochloric acid is acidic.
ii) In 10cm^3 of 0.100 mole/dm^3 of hydrochloric acid, there are:
10/1000*0.1 = 1.00x10^(-3) moles of hydrochloric acid were used.
Using one specific example, explain why the human genome project
considered important.
Answer:
initiated the comprehensive discovery and cataloguing of a 'parts list' of most human genes
Explanation:
If an isotope decays by the process of beta emission,
a. the number of neutrons remains the same
b. the atomic number changes
c. the mass number changes
d. protons are given off
Which pair of compounds represents one arrhenius acid and one arrhenius base?.
Explanation:
use the diagram above to understand it
Limiting and Excess Reactant
1. Aluminum chloride, AlCl3, can be made by the reaction of aluminum with chlorine according to the following equation (must be balanced first):
2Al + 3Cl2 ------> 2AlCl3
What are the limiting and excess reactants if 20.0 grams of Al and 30.0 grams of Cl2 are used?
2. Chloroform, CHCl3, reacts with chlorine, Cl2, to form carbon tetrachloride, CCl4, and hydrogen chloride, HCl. In an experiment 25 grams of chloroform and 0.36 mol of chlorine were mixed. Which is the limiting reactant? The equation is given as
CHCl3 + Cl2 -------> CCl4 + HCl
Answer:
1. LR: Cl2, ER: Al 2. LR: CHCl3
Explanation:
1. Find g/moles of Al and Cl2
g/moles of Al: 0.74 and Cl2 is 0.42
We can find the limiting reactant by take those number divided by 2 and 3
0.74 divided by 2 = 0.37
0.42 divided by 3 = 0.14 so 0.14 is the least -> that going to be the limiting reactant. (Cl2)
Now we know Al is a excess reactant.
2. That equation is already balanced and it's already give us 0.36 mole of chlorine, now we just need to find the mole of chloroform ( CHCl3 )
To do that we need to find the molar mass of CHCl3 which is 119.0 g/moles
then take 25 grams ÷ by 119g/moles we will get: 0.21 mole of CHCl3 that's mean CHCl3 is a limiting reactant.
A 1.00 l volume of hcl reacted completely with 2.00 l of 1.50 m ca(oh)2 according to the balanced chemical equation below. 2hcl ca(oh)2 right arrow. cacl2 2h2o what was the molarity of the hcl solution? 0.375 m 1.50 m 3.00 m 6.00 m
6 M is the molarity of the HCl solution with volume 1 liter.
How we calculate molarity?
Molarity (M) of solution is define as the number of moles (n) of solute present in per liter (V) of solution, i.e. M = n/V.
Given chemical reaction is:
2HCl + Ca(OH)₂ → CaCl₂ + 2H₂O
Given volume of HCl = 1 L
Given volume of Ca(OH)₂ = 2 L
Molarity of Ca(OH)₂ = 1.50M
Moles of Ca(OH)₂ = 1.50 × 2 = 3 moles
From the stoichiometry of the reaction:
1 mole of Ca(OH)₂ = react with 2 moles of HCl
3 mole of Ca(OH)₂ = react with 2×3=6 moles of HCl
Molarity of HCl will be calculated by using the above given formula as:
M = 6/1 = 6M.
Hence, option (4) is correct i.e. 6 M.
To know more about molarity, visit the below link:
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Answer:
D
Explanation:
trust
Burning hydrogen is an example of a chemical reaction. The reaction is
shown in the diagram. Which of the following statements about energy in
this reaction is the most accurate?
Answer:
Energy is first released then arbsorbed the eventually it dissappears
Explanation:
3. A 1.000 g sample of an unknown hydrate of copper chloride is gently dehydrated. The copper is isolated and weighs 0.248 g.
Develop a method for determining the empirical formula of the copper compound and for determining the percent by mass of copper in the compound.
Remark: The experimental data table obtained by the student is shown below.
Data:
Mass of crucible 20.43 g
Mass of crucible + CuxCly • zH2O. 21.43 g
Mass of crucible + CuxCly 20.976 g
Answer: not sure on actual answer, but heres a answer on a similar question with just different quantities.
Explanation: just minus the terms i got and u should be okay
At a research lab, a scientist carelessly pours cultures of living microbes down the drain
Answer:
that's not good
Explanation:
microbes???? not good for a sewage system
What type of bonds are located between the nucleotides found in the same DNA strand ?
Group of answer choices
phosphodiester
hydrogen
hydrophobic
van der waals
ionic
Answer:
hydrogen bond exists between nucleotides
Answer:
phosphodiester
Explanation:
Noncovalent hydrogen bonds connect the nucleotides that make up each DNA strand. Individual hydrogen bonds are weaker than covalent bonds like phosphodiester bonds. But they are so numerous that they strongly connect the two DNA polymers.
I hope this helps you
:)
true or false: A person standing still with two heavy bundles is doing a lot of work
2. During which of the following stato changes would the particles in the matter become more spread out?
changing from liquid to gas?
changing from gas to liquid?
changing from gas to solid?
Answer
changing from liquid to gas
Explanation
changing from liquid to gas
what mass of magnesium bromide is produced when 35cm3 of 0.18 mol/dm3 of hydrogen bromide is treated with magnesium nitrate?
Answer:
C3H8
Explanation:
1 1.5mol
2 0.75mol
3 0.667mol
Questions 1.2
1 16.7mol
2 8.3×10−3mol
Questions 1.3
1 9
2 11
3 12
4 24
5 22
Questions 1.4
1 a) 151.9
b) 162.1
c) 60.0
d) 132.1
e) 388.8
2 a) 0.5mol
b) 2.5mol
c) 0.6mol
d) 2.0mol
e) 0.38mol
3 a) 180.6g
b) 44.46g
Questions 1.5
1 Mr = 277.9 moles of oxygen = 11
2 Mr = 474.3 moles of oxygen = 20
Questions 1.6
1 Cu2S
2 C3H8
3 CaFe2O4
Questions 1.7
1 a) 2H2 + O2 → 2H2O
b) I2 + 3Cl2 → 2ICl3
c) NaOH + Al(OH)3 → NaAlO2 + 2H2O
d) 2H2S + SO2 → 3S + 2H2O
e) 4NH3 + 3O2 → 2N2 + 6H2O
2 a) MgCO3 → MgO + CO2
b) Pb(s) + 2AgNO3(aq) → Pb(NO3)2(aq) + 2Ag(s)
c) Na2O(s) + H2O(l) → 2NaOH(aq)
d) 2FeCl2 + Cl2 → 2FeCl3
e) Fe2(SO4)3 + 6NaOH → 2Fe(OH)3 + 3Na2SO4
Questions 1.8
1 17.0g
2 60.7g
3 51.1%
Questions 1.9
1 1.2dm3
2 Volume of SO2 = 50cm3; mass of sulfur = 0.20g
Questions 1.10
1 a) 2.67moldm−3
b) 0.025moldm−3
c) 0.833moldm−3
2 a) 0.75mol
b) 0.044mol
c) 0.010mol
Somebody help me? my head hurts here
1.between which two points is the car accelerating at the greatest rate?
2.between which two points is the car travelling at a steady speed?
3.what is the acceleration of the car between C and D?
4.between which two points is the acceleration getting bigger and bigger?
5.what is the acceleration of the car between D and F?
Answer 1 :
[tex]\green{\sf{D \: and \: E}}[/tex]
Step-by-step explanation:
As per graph, the highest lines are D and E. They are increasing.
Answer 2:-
[tex]\sf{\blue{B \: and \: C}}[/tex]
Step-by-step Explanation:
It is because the line between B and C is straight, indicating that it is steady.
Answer 3:-
[tex]\sf{\pink{2 \: m/s}}[/tex]
Step-by-step Explanation:
Its because the interval between line CD can be taken as-
[tex]\sf{40-50 = 1 m/s} \\ \sf{50-60 = 2 m/s}[/tex]
Hence, 2 m/s.
Answer 4:
[tex]\sf{\red{A \: and \: E}}[/tex]
Step-by-step Explanation:
We can see from the graph that the change in lines us occurring between initial and final points, i.e., between A and E.
Answer 5:
[tex]\sf{\purple{1m/s}}[/tex]
Step-by-step Explanation:
This is because, we can consider the interval between points D and E as :-
[tex]\sf{60-70=1m/s}[/tex]
What is respiration? Explain in your own words
Answer:
breathing
Explanation:
Your welcome lol
hope this helps :) pls give brainliest
Answer:
SEE BELOW
Explanation:
The act or process of breathing i.e the inhaling of oxygen and the exhaling of carbon dioxide. The process in which cells use oxygen to break down sugar and obtain energy which is used for various purposes.
Which explanations did you include in your response? Check all that apply. The oxidation number of carbon changes from -1 to +4. The oxidation number of oxygen changes from 0 to -2. Carbon is oxidized. Oxygen is reduced. Electrons are transferred from carbon to oxygen.
Answer:
B, E
Explanation:
Edge
Where does Respiration mainly take place in?
A - Mitochondria
B - The nucleus
C - The cell wall
D - The vacuole
What do you know about other ecosystems in which predators havre caused their prey to go extinct
Answer:
Humans :)
Explanation:
Humans have killed so many species of wolves, deer, tigers, lions and bears oh my!
In the food chain, we, humans are at the top because of this
someone help me what is the difference between alchemy and chemistry
Answer:
Alchemy is based on mystic view of reality whereas chemistry is based on experiments, observations and facts.
explain the occurrence of oxygen
Answer:
Oxygen is one of the most abundant elements on Earth. Oxygen accounts for 20.9% of the atmosphere, 45% of the Earth's crust (as oxide minerals) and also accounts for almost all of the mass of water on Earth (89%). It is found in a huge number of natural minerals including sulfates, phosphates, carbonates and oxides.
Explanation:
Hope this helps
Aluminum metal can be recycled from scrap metal by melting the metal to evaporate impurities. a. Calculate the amount of heat needed to purify 1.00 mole of Al originally at 298 K by melting it. The melting point of Al is 933 K. The molar heat capacity of Al is 24 J/(mol K), and the heat of fusion of Al is 10.7 kJ/mol.
The amount of heat required to purify the Al is 25.94 * 10^3 J
What is heat capacity?The term heat capacity refers to the amount of heat required to raise the temperature of a substance by 1K. The aluminum was heated from 298 K to 933 K then it melted.
The total heat required is;
H = ncdT + nL
H = (1 * 24 * (933 - 298)) + (1 * 10.7 * 10^3)
H = 15.24 * 10^3 J + 10.7 * 10^3 J
H = 25.94 * 10^3 J
Learn more about heat capacity: https://brainly.com/question/1453843
Please help me
Calculate the percentage of nitrogen in the two important nitrogen fertilizers,ammonia, NH3 and Urea, CO(NH2)2
Answer:
Percent composition = mass of element in the compound/mass of compound × 100
In this case, the mass of the compound is its molar mass.
Percent Composition of N in CO(NH2)2 (urea)
Molar mass CO(NH2)2 = 60.056 g/mol
Mass of N = 2×14.007 g/mol = 28.014 g/mol
%N: 28.014 g/mol/60.056 g/mol × 100 = 46.646%
Percent Composition of N in NH4NO3 (ammonium nitrate)
Molar mass of NH4NO3 = 80.044g/mol
Mass of N = 2×14.007 = 28.014 g/mol
%N: 28.014 g/mol/80.044 g/mol × 100 = 34.998%
Hope this helps, please let me know If I'm wrong.
ii) Adding common salt to distilled water makes it a) Good conductor b) Insulator c) Both a &b a
Answer:
Explanation:
Salt + water gives an adequate conductor. It is not absolutely wonderful like silver, but it will conduct electricity to varying degrees depending on the depth of salt water that the conductor is held at.
I'd say A.
The chemical equation below shows the combustion of methane (ch4). ch4 2o2 right arrow. co2 2h2o the molar mass of oxygen gas (o2) is 32.00 g/mol. the molar mass of carbon dioxide (co2) is 44.01 g/mol. what mass of co2, in grams, will form when 8.94 g o2 completely react? 3.25 grams 6.15 grams 13.0 grams 53.0 grams
6.15 grams of carbon dioxide is form when 8.94 g of oxygen is completely react.
How we calculate mass from moles?Mass of any substance will be calculated from moles as :
n = W/M, where
W = required mass
M = molar mass
Given combustion reaction is:
CH₄ + 2O₂ → CO₂ + 2H₂O
Given mass of O₂ = 8.94 g
Molar mass of O₂ = 32.00 g/mole
Moles of O₂ = 8.94 / 32 = 0.279 mole
From the stoichiometry of the reaction, it is clear that:
2 moles of O₂ = produce 1 mole of CO₂
0.279 moles of O₂ = produce 1/2×0.279 = 0.139 moles of CO₂
Molar mass of CO₂ = 44 g/mole
Required mass of CO₂ will be calculated as:
W = n × M
W = 0.139 × 44 = 6.15 grams
Hence, option (2) is correct i.e. 6.15 grams.
To know more about moles, visit the below link:
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Answer:
Option 2/ B. 6.15 grams on edge.
Explanation:
S/o to the person above me, got it because of them.
How many energy levels does europium have?
Answer:
6 Energy levels
Explanation:
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 25
Fifth Energy Level: 8
Sixth Energy Level: 2
Hope this helps.
Calculate the pH for the following solutions and indicate whether each solution is acidic or basic.
[H+] = 2.4 × 10-6M pH = __________ Acid/Base
[tex]\\ \rm\Rrightarrow pH=-log[H^+][/tex]
[tex]\\ \rm\Rrightarrow pH=-log(2.4\times 10^{-6})[/tex]
[tex]\\ \rm\Rrightarrow pH=-log2.4-log10^{-6}[/tex]
[tex]\\ \rm\Rrightarrow pH=-0.38+6[/tex]
[tex]\\ \rm\Rrightarrow pH=5.62[/tex]
Acid9. I have a mixture of iron, salt, and water. I bring a magnet close by. What does the magnet pick up and what is left behind?
Explanation:
magnet will attract iron.
salt and water is left behind
Predict the products
___Cu(NO3)2 + ___NaOH → ___ ________ + ___ ________
___ CuO + 2 HCl → ___ H2O + ___ ________
Answer:
1.) Cu(NO₃)₂ + 2 NaOH --> Cu(OH)₂ + 2 NaNO₃
2.) CuO + 2 HCl --> H₂O + CuCl₂
Explanation:
Both of these reactions are substitution/double displacement reactions. The base reaction looks like this: AX + BY --> AY + BX. In other words, the negative ion of the first molecule bonds to the positive ion of the second molecule, and vice versa.
The products of the first equation are:
Cu(NO₃)₂ + NaOH --> Cu(OH)₂ + NaNO₃
The OH⁻ and the NO₃⁺ are polyatomic ions, meaning they stay together in these types of reactions. When determining the products, make sure to take note of the charges on the ions because subscripts may be necessary to balance them out.
Now you need to balance the coefficients. When balancing equations, begin with an element that is not present in more than one molecule on either side (ex. the oxygen is in two molecules on the reactant side). Keep in mind that the subscripts should be multiplied by the coefficients when determining the number of some elements.
The balanced first equation is:
Cu(NO₃)₂ + 2 NaOH --> Cu(OH)₂ + 2 NaNO₃
The process for the second equation is nearly identical to the first. The balanced second equation is:
CuO + 2 HCl --> H₂O + CuCl₂