Answer:
Producers.
Explanation:
Since the source of energy is the sun, the trophic level representing producers contains the most energy.
If spin is not included, how many different wave functions correspond to the first excited level n = 2 for hydrogen?
If spin is not included, there are 4 different waves functions correspond to the first excited level n = 2 for hydrogen.
What are wave function?In quantum mechanics, a wave function is a variable quantity that mathematically describes a particle's wave characteristics.
The probability of a particle being present at a given point in space and time is related to the value of the particle's wave function.
Thus, there are 4 different waves functions correspond to the first excited level n = 2 for hydrogen.
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A mixture of helium, nitrogen and oxygen has a total pressure of 821 mmHg. The partial pressure of helium is 105 mmHg, and the partial pressure of nitrogen is 312 mmHg. What is the partial pressure (in mmHg) of oxygen in the mixture?
Answer:
Total partial pressure, Pt = 821 mm Hg
Partial pressure of Helium, P1 = 105 mm Hg
Partial pressure of Nitrogen, P2 = 312 mm Hg
Partial pressure of Oxygen, P3 = ? mm Hg
According to Dalton's law of Partial pressures,
Pt = P1 + P2 + P3
So, P3 = 404 mm Hg
A 78.0 sample of gold at 175°C is put in a foam cup calorimeter with 25.0 g of water at 25.0°C. Calculate the specific heat of the gold if the final temperature is 38.18°C and the specific heat of water is 4.18 J/g°C. Show your work.
Thanks for the help!!
The answer is the specific heat of the gold is 0.129 J/gC .
What is Calorimetry ?It is an experimental method that allows one to calculate the heat change in a chemical process.
Calorimeter is just a reaction vessel. It could be a foam cup, a soda can, or a commercially available bomb calorimeter
Where q represents the heat change in the reaction, the calorimeter and the water. Since you are only measuring temperature, you will need to calculate the heat using it.
The change in heat of the gold is given by:
[tex]\rm q_{gold} = m c_{gold}\Delta T[/tex]
[tex]=78 \times c_{p}\times (175-38.18)[/tex]
The change in heat of the water is given by:
[tex]\rm q_{water} = mc_{p}\Delta T[/tex]
m is the mass of water in the calorimeter in grams,
and delta T is the change in temperature.
where [tex]\rm c_{p}[/tex] is the specific heat of water, which is 4.184 J/gC
mass of water = 25 g of water.
Temperature T₁ = 25°C
Final Temperature = 38.18 °C
Difference between temperature = 13.18 °C
[tex]\rm q_{water} = 25 \times 4.18\times 13.18[/tex]
For a Foam Cup Calorimeter
[tex]\rm q_{water} = q_{cal}\\\\\\\rm 25\times4.18\times13.318 = 78 \times c_{p}\times (175-38.18)\\\\\\On \;solving\; this \;we \;get \;c_{p} = 0.129[/tex]
Therefore the the specific heat of the gold is 0.129 J/gC
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Why is knowing the density of water importance to us? please don’t copy and paste explain why for this question
in order to get quality of water
Questlon 2 of 10
Which of these describes a reason why nuclear power is important?
• A. Solar technology can be installed to provide any home with power.
• B. Solar and wind technologies are both "green."
• C. Solar and wind technologies are location specific.
• D. It's important to use "green" energy to protect our environment.
Answer:
c
Explanation:
its the only one with a downside to solar and wind.
A substance that has a pH = 7 is a/an
-Acid
-base
-neutral solution
-none of the above
As the atomic number of elements within Group 2 increases, the metallic character of each successive element
(1) decreases
(2) increases
(3) remains the same
An ecosystem where all organisms have niches and habitats will be
balanced.
unbalanced.
Answer:
balenced.
Explanation:
An ecosystem where all organisms have niches and habitats will be balanced.
What is an ecosystem ?An ecosystem consists of all the organisms and the physical environment with which they interact.
What is a niche ?Niche describes the role an organism plays in a community. A species' niche encompasses both the physical and environmental conditions it requires and the interactions it has with other species.
What is a habitat ?Habitat is the area and resources used by a particular species.
A balanced ecosystem represents a sustainable habitat of interdependent animals, plants, and microorganisms and their environment.
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list the symbols for the noble gases
Answer:here:
Explanation:helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
Balance the equation for a half-reaction that occurs in acidic solution. Use e− as the symbol for an electron
The balanced half-reaction equation is [tex]MnO_4^- + 4H^+ --- > MnO_2 + 2H_2O + 3e^-[/tex]
What is a redox reaction?The term redox reaction has to do with a reaction in which there is a loss or gain of electrons. In this reaction, one specie accepts electrons while another species loses electrons.
The balanced half-reaction equation in acid is;
[tex]MnO_4^- + 4H^+ --- > MnO_2 + 2H_2O + 3e^-[/tex]
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Greenhouse gases,,,
absorb heat from the sun
trap ozone at Earth’s surface
are only produced naturally
keep Earth cool
Answer:
absorb heat from the sun
Explanation:
Greenhouse gases are specific type of gases that possess the ability to trap and emit heat/thermal energy in the atmosphere. They are able to do this because of their structure. Examples of greenhouse gases are carbon dioxide (CO2), methane (CH4), chlorofluorocarbon (CFC) etc and are mostly produced via anthropogenic activities.
Greenhouse gases are therefore, produced both artificially (by burning fossil fuels) and naturally and functions to absorb heat from the atmospheric surroundings.
1. How many formula units are contained in 270.2 g of zinc nitrate, Zn(NO3)2?
50 POINTS
Zinc nitrate has 1 molecule of zinc (Zn), 2 molecules of nitrogen (N) and 6 molecules of oxygen (O).
Calculate the molecular mass of zinc nitrate by adding the molecular weights for all molecules in the compound.
Here are the molecular weights for each element:
Zn=65.38 g/mol
N=14.01 g/mol
O=16.00 g/mol
The molecular weight of zinc nitrate is then: 1*(65.38)+2*(14.01)+6*(16.00)=189.40 g/mol.
Using a conversion formula to calculate moles of zinc nitrate:
163.97gZn(NO
3
)
2
∗
189.40gZn(NO
3
)
2
1molZn(NO
3
)
2
=0.866molZn(NO
3
)
2
There are 0.866 moles of zinc nitrate.
Note: These numbers may vary slightly due to the source of the molecular weight data and the number of decimal places used.
How many grams of nacl are present in 350 ml of a 0. 277 m solution of sodium chloride? a 1. 66 g b 16. 2 g c none of these d 97. 0 g e 5. 67 g
A NaCl solution of 350 mL volume and a concentration of 0.277 M will contain 5.67 grams of the salt.
Mole calculationRecall that:
Mole = molarity x volume.
Also:
Mass = mole x molar mass
Hence;
Mole of 350 mL, 0.277 NaCl = 0.350 x 0.277 = 0.097 moles
Mass of 0.097 moles NaCl = 0.097 x 58.44 = 5.67 grams
Thus, a 350 mL, 0.277 M NaCl solution will contain 5.67 grams of the salt.
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How many atoms of oxygen are in 2. 50 moles of so2?
The number of atoms of oxygen are present in 2.50 moles of sulfur dioxide is 30.110 × 10²³.
What is Avogadro's number?Avogadro's number is define as the number of atoms present in one mole of any substance and it is equal to 6.022 × 10²³.
In the 1 mole of SO₂ 2 moles of oxygen are present. So that in 2 moles of SO₂, 2(2.5) = 5 moles of oxygen is present.
No. of atoms of oxygen in 5 moles of oxygen will be calculated as:
No. of atoms = 5 mole × 6.022 × 10²³atoms per mole = 30.110 × 10²³atoms
Hence number of atoms of oxygen is 30.110 × 10²³.
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Enter an equation to show how h2po3− can act as a base with hs− acting as an acid
The base is the species that accept hydrogen, and the acids donate hydrogen ions. Dihydrogen phosphite acts as a base and hydrosulfide sulfanide act as an acid.
What are acids and bases?Acids are molecules or chemical species that can donate a proton or a hydrogen ion to another chemical species.
Bases are the ions or molecules that accept a proton or hydrogen ion and release a hydroxide ion.
The acid and base relationship is shown as,
[tex]\rm H2PO_{3}^{-} + HS^{-} \leftrightarrows S^{-} + H_{3}PO_{3}[/tex]
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What is the name of the industry that produces solvents, lubricants, polymers and detergents?
Answer:
the petrochemical industry
Explanation:
"Petrochemicals are the chemical products obtained from petroleum by refining. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sources such as maize, palm fruit or sugar cane." - Textbook excerpt
During photosynthesis and cellular respiration plus carry out processes that involve both light and energy and chemical energy. Sort each tile into the correct column.
-Used to directly power cell growth
-Used to directly power photosynthesis
-Released through cellular respiration
-Captured by chloroplyll
Chemical energy power cell growth, solar radiation power photosynthesis and is captured by chlorophyll, and carbon dioxide is released through cellular respiration.
Photosynthesis and RespirationDuring photosynthesis, solar radiation is captured by chlorophyll in green plants, and this is used to fix inorganic carbon dioxide and water to produce plant food in the form of carbohydrates.
During respiration, the carbohydrates synthesized via photosynthesis are broken down chemically to extract the energy locked in them. Carbon dioxide is produced as a by-product.
The energy extracted by respiration is used to power metabolic processes in plants.
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The following flow of energy takes place in one ecosystem: alga → insect → larva flatworm → fish.
Which trophic level has the most energy to pass on to the next?
A) insect larva
B) fish
C) flatworm
D) alga
Answer: D. Alga
Explanation:
HELP PLEASE I BEG OF YOU
14-karat gold is 58 percent gold and 42 percent copper. calculate the actual amount of gold in a 65-g 14 karat gold chain.
Answer:
37.7%
Explanation:
58% of 65 is 37.7%
Fe +0₂--Fe₂O3
35. What type of reaction is given
Please help!!!
what is the name of pb(no3)2? explain how you determined the bond type and the steps you used to determine the naming convention for the compound.
The cation part is named first in an ionic compound and the anionic part is named with the suffix of ate, id etc. The name of the ionic compound Pb (NO₃)₂ is lead nitrate.
What are ionic compounds?Ionic compounds are formed between metals and nonmetals. Metals are electron rich and can easily lose electrons to form positively charged ions called cations.
Non-metals with electron-deficiency will gain electron from the metals and acquires a negative charge to form anions. The electrostatic force of this negative clouds and positive cloud from the cation is called ionic bonding.
For ionic compounds, the cation or metals are named first. Pb is a metal with two valence electrons and NO₃ group has a negative charge. Thus, Pb donates its two electrons each to each nitrate groups and the anionic part nitrate is named last.
Therefore, the compound name is lead nitrate.
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A chemist wants to extract copper metal from copper chloride solution. The chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (II) chloride. A single replacement reaction takes place. Which statement explains the maximum amount of copper that the chemist can extract using this reaction?
Unbalanced equation: CuCl2 + Al → AlCl3 + Cu
A. Approximately 0.36 grams, because copper (II) chloride acts as a limiting reactant
B. Approximately 1.8 grams, because copper (II) chloride acts as a limiting reactant
C. Approximately 0.36 grams, because aluminum acts as a limiting reactant
D. Approximately 1.8 grams, because aluminum acts as a limiting reactant
Approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.
What is an Equation ?A representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.
Based on the balanced equation of reaction and the reacting masses, approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.
The amount of copper produced is determined from the balanced equation of the reaction.
The equation of the reaction is given below:
3 CuCl₂ + 2 Al → 2 AlCl₃ + 3 Cu
molar mass of CuCl₂ = 132 g/mol
molar mass of Al = 27.0 g
molar mass of Cu = 64.0 g
moles of aluminium in 0.50 g = 0.50 / 27 = 0.018 moles
moles of CuCl₂ in 0.75 g = 0.75/132 = 0.00568 moles
Therefore, CuCl₂ is the limiting reactant
3 moles of CuCl₂ produces 3 moles of Cu
0.00568 moles of CuCl₂ will produce 0.00568 moles of Cu
Mass of 0.005 moles of Cu = 0.00568 * 64 = 0.36 g of Cu
Therefore, approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.
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What is the mass percentage of C in caffeine, C₈H₁₀N₄O₂? Provide an answer to two decimal places.
Answer:
46.8% should be. correct, I'm not fully sure though. : )
The mass percentage of the carbon in the caffeine C₈H₁₀N₄O₂ is equal to 49.48 %.
What is the mass percent formula?The mass percentage formula can be expressed by mass of the each element in one mole of the compound divided by the molar mass of the compound.
The mass percentage of one component in any compound can be calculated as follows:
Mass percent = (Mass of an element one mole of the compound)/(Molar mass of compound) ×100
Given, the chemical formula of the compound caffeine is C₈H₁₀N₄O₂.
The molar mass of the caffeine, C₈H₁₀N₄O₂ = 194 g/mol
We know that the atomic mass of carbon (C) = 12 g/mol
The mass of the carbon in caffeine = 8 × 12 = 108 g/mol
The mass percent of carbon = (108/194) × 100 = 49.48 %
Therefore, the mass percentage of carbon in caffeine is equal to 49.48 %.
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Under what conditions of temperature and pressure is a gas least soluble in water
The conditions of temperature and pressure in which a gas least soluble in water is low pressure and high temperature.
What is Henry Law?The amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid, according to Henry's law.
From this law it is clear that:
As the pressure of the gas increases solubility of the gas on the liquid also increases.But if the temperature of the liquid decreases then the solubility of the gas also increases.
Hence at low pressure and high temperature, gas is least soluble.
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What is the ph of a 0. 571 m solution of hydrosulfuric acid, h2s?
pH is the potential of the hydrogen in the aqueous solution. The pH of the hydrosulfuric acid is 0.6.
What is pH?pH is the hydrogen or the hydronium ion concentration in the aqueous solution. The formula to calculate pH is given as,
[tex]\rm pH = \rm - log [H^{+}][/tex]
Since hydrosulfuric acid is diprotic the concentration of the hydrogen ion will be:
[tex]\begin{aligned} \rm [H^{+}] &= 2 \times 0. 571 \;\rm M \\\\&= 1.142\end{aligned}[/tex]
Now, pH is calculated as:
[tex]\begin{aligned} \rm pH &= \rm - log [H^{+}]\\\\&= \rm - log [1.142]\\\\&= 0.06\end{aligned}[/tex]
Therefore, 0.6 is the pH of the hydrosulfuric acid solution.
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The pressure inside of the chem-101 laboratory is 751 mm Hg. Calculate the pressure in units of atmospheres? (760 mm Hg = 1.00 atm)
751/760 x 1 atm = 0.988 atm
1
How many atoms of carbon would be present in a molecule of CCl4?
A
5
B
1
С
2
D 4
Answer:
There are 5! goodluck,
Explanation:
Which reaction is endothermic? hcl naoh right arrow. nacl h2o 58 kj 6co2 12h2o energy right arrow. c6h12o6 6o2 6h2o 2na cl2 right arrow. 2nacl energy 2c2h6 7o2 right arrow. 4co2 6h2o 2,502 kj
Endothermic reactions are those in which heat is absorbed from the surroundings.
What are endothermic reactions?They are reactions in which heat is absorbed from the surrounding, making the reaction vessels become colder.
It is unlike exothermic reactions in which heat is released into the surrounding, making the reaction vessel to be warmer.
For endothermic reactions, the enthalpy change is always positive because heat is absorbed. It is however negative for exothermic reactions because heat is evolved.
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Answer:
B. 6CO2 + 12H2O + energy = C6H12O6 + 6O2 + 6H2O
Explanation:
Consider the hydrocarbon below. a skeletal model with line segments going up, down, up, and up again in a triple bond. what is the name of this hydrocarbon? 1-ethyne 1-pentyne 1-ethane 1-butyne
The compound as shown corresponds to the compound 1-ethyne.
What is a hydrocarbon?The term hydrocarbon refers to a compound that is composed of only hydrogen and carbon. A hydrocarbon may be an alkane, alkene, alkyne or aromatic compound.
Looking at the structure of the compound as shown, the structure corresponds to the compound 1-ethyne.
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Answer:
D.
Explanation:
I took the test
could someone help, I know its a pretty simple concept but I've been doing a lot of stuff today and my brain is fried
Answer:
-268.42 C DEGREES
Explanation:
P1/T1 = P2/T2
63 / (25+273.15) = 1 / T2
T2 = 4.73 K = -268.42