Answer:
A food chain shows how energy flows from one organism to another. In general, energy flows from the Sun to producers and then to consumers. The path is linear as the energy present in one step is transferred to the next. You can find specific examples of this pathway in an ecosystem
g Which statement is false? According to the rate law, the greater the rate constant (k), the faster the rate of reaction is. According to the Arrhenius equation, the greater the collision frequency of molecules (A), the greater the rate constant (k) is. According to the Arrhenius equation, the greater the activation energy of the reaction (Ea), the greater the rate constant (k) is. According to the Arrhenius equation, the greater the temperature of reaction (T), the greater the rate constant (k) is.
Answer:
According to the Arrhenius equation, the greater the activation energy of the reaction (Ea), the greater the rate constant (k) is.
Explanation:
Rate law in chemistry describes the relationship between the concentration of reactants and the rate of reaction. In the rate law expression i.e. Rate = K {X}, K is the proportionality constant called RATE CONSTANT. The greater the value of this rate constant (k), the faster the rate of reaction is.
According to the Arrhenius equation, mathematically written as:
K= Ae (-EA/RT) where; k is the rate constant, Ea is the activation energy, T= temperature, R= gas constant.
- The collision frequency of molecules is dependent on the temperature, which when increases causes an increase in the rate constant.
- In the presence of a catalyst, the activation energy is lowered causing the rate of reaction to increase, meaning that the rate constant is increased. Hence, the GREATER the activation energy of the reaction (Ea), the LOWER the rate constant (k) is.
- An increase in temperature causes the rate of constant (K) to increase.
What is the mass of 3.15 moles of calcium sulfate, CaSO4?
Answer:
3.15 * 136 (136 is the molar mass of calcium sulfate). = 428 g CaSO4.
Explanation:
Are sodium and chlorine reactants or products
Answer:
reactants
Explanation:
Although there are the same atoms present in both the reactants and the products, the atoms in the reactants were rearranged to create a new substance, sodium chloride. Sodium chloride was not present in the reactants.
What is a chemical that organisms use for primarily energy
A-protein
B-carbohydrate
C-lipid
D- water
You weighed your empty insulated cup and found that the mass of the cup was 3.2 g. You add some hot water and find that the total mass increases to 28.1 g. You got some ice from the bus tub, and found that it was wet. After drying it carefully, you take the temperature of the hot water in the cup and find that its temperature is 60.7 °C and then add the ice. The temperature of the water dropped, and came to equilibrium at 35.1 °C. At the end of the experiment you re-weigh the cup and find that the mass has increased to 33.0 g.What was the initial temperature of the ice?What is your experimental value for the heat of fusion?
Answer:
Initial temperature of ice for this experiment = 0⁰c
heat of fusion = 95 cal
Explanation:
mass of empty cup = 3.2 g
mass of cup filled with hot water = 28.1 g
hence : mass of hot water = 28.1 - 3.2 = 24.9 g
mass of hot water + ice + empty cup = 33.0 g
hence : mass of ice = 33.0 - 24.9 - 3.2 = 4.9 g
temperature of hot water = 60.7⁰c
when ice was added ( temperature of mixture ) = 35.1⁰c
A) Initial temperature of the ice
initial temperature of ice is 0⁰c
B) experimental value for heat of fusion
we have the apply the law of energy conservation
= heat lost(hot water ) = heat gain by ice s = specific heat of water = 1 cal
= M*s*ΔT = Mice * Hf + Mice *s *T
= 24.9 * 1 * ( 60.7 - 35.1 ) = 4.9 * Hf + 4.9 * 1 * 35.1
= 24.9 ( 25.6 ) = 4.9 hf + 171.99
Hf ( heat of fusion ) = 465.45 / 4.9 = 94.99 ≈ 95 cal
The Initial temperature of ice for this experiment is 0⁰c
The experimental heat of fusion of ice is 95.1 cal/g
Temperature of wet iceWet ice means ice with water on top of it or ice that is melting.
Since the ice was wet or melting, it means that its temperature was 0⁰c
Initial temperature of ice for this experiment = 0⁰c
Experimental value of the heat of fusion of ice.Heat of fusion is the amount of heat energy required to melt a given amount of a solid at its melting point.Using the law of conservation of heat
Heat lost by hot water = Heat gained by iceinitial temperature of ice is 0⁰c
mass of empty cup, m1 = 3.2 g
mass of cup filled with hot water, m2 = 28.1 g
mass of hot water, m3 = m2 - m1
mass of hot water = 28.1 - 3.2
mass of hot water = 24.9 g
mass of hot water + ice + empty cup, m4 = 33.0 g
mass of ice, m5 = m4 - m2
mass of ice = 33.0 - 28.1 = 4.9 g
temperature of hot water = 60.7⁰c
final temperature of ice + hot water mixture = 35.1⁰c
Initial temperature of the ice = y
Heat lost by hot water, H = mcΔT
where m = mass of hot water
c = specific heat of water = 1 cal
ΔT = temperature change
H = 24.9 × 1 × {35.1 - 60.7}
H = 637.44
Therefore, Heat gained by ice = 637.44
Heat gained by ice = Heat gained in changing from ice at 0°C to water at 0°C + Heat gained in changing from water at 0°C to water at 35.1°CHeat gained in changing from ice at 0°C to water at 0°C = m×Hf
where m is mass of iceHf is heat of fusion of iceHeat gained in changing from water at 0°C to water at 35.1°C = mcΔT
where m = mass of water at 0°C
c = specific heat of water = 1 cal
ΔT = temperature change
Heat gained by ice = 4.9 × Hf + 4.9 × 1 × {35 - 0}
Heat gained by ice = 4.9 × Hf + 171.5
637.44 - 171.5 = 4.9 × Hf
Hf = 465.94/4.9
Hf = 95.1 cal/g
Therefore, Heat of fusion of ice = 95.1 cal/g
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A solution containing a mixture of 0.0333 M0.0333 M potassium chromate ( K2CrO4K2CrO4 ) and 0.0532 M0.0532 M sodium oxalate ( Na2C2O4Na2C2O4 ) was titrated with a solution of barium chloride ( BaCl2BaCl2 ) for the purpose of separating CrO2−4CrO42− and C2O2−4C2O42− by precipitation with the Ba2+Ba2+ cation. The solubility product constants ( KspKsp ) for BaCrO4BaCrO4 and BaC2O4BaC2O4 are 2.10×10−102.10×10−10 and 1.30×10−61.30×10−6 , respectively.
A) Which barium salt will precipitate first? O BaC204 O BaCrO4
B) What concentration of Ba2+ must be present for BaCrO4 to begin precipitating? Number [Ba2+]=
C) What concentration of Ba is required to reduce oxalate to 10% of its original concentration? Number 2+
D) What is the ratio of oxalate to chromate (IC204CrO4) when the Ba2 concentration is 0.0050 M? Number C,O Cro,
Answer:
Explanation:
K₂CrO₄ + ( COONa )₂ + 2BaCl₂ = Ba CrO₄ + ( COO ) ₂ Ba + 2 KCl + 2 NaCl
.033 M .053 M
Ksp of Ba CrO₄ is 2.10×10⁻¹⁰
Ksp of ( COO ) ₂ Ba is 1.30×10⁻⁶
A ) Ksp of Ba CrO₄ is less so it will precipitate out first .
B) Ksp = 2.10×10⁻¹⁰
Ba CrO₄ = Ba⁺² + CrO₄⁻²
C .033
C x .033 = 2.10×10⁻¹⁰
C = 63.63 x 10⁻¹⁰ M
Ba⁺² must be present in concentration = 63.63 x 10⁻¹⁰ M
C)
90% of precipitation of barium oxalate
concentration of oxalate to precipitate out = .9 x .0532 = .04788
( COO ) ₂ Ba = (COO)₂⁻² + Ba⁺²
.04788 M C
C x .04788 = 1.30×10⁻⁶
C = 27.15 x 10⁻⁶ M .
Which of the following answer choices represents a typical anion
Answer:
This question is incomplete
Explanation:
This question is incomplete but generally, anions are ions that are made up of an atom or group of atoms (polyatomic) that are negatively charged. The first thing one should look out for when trying to identify an anion is the negative charge. Examples of anions include Cl⁻, O²⁻, N³⁻, NO₃⁻, SO₄²⁻, PO₄³⁻and AsO₄³⁻.
A marble has a density of 11 g/cm3 and when dropped in a graduated cylinder increases the water level from 2 mL to 4 mL of volume. What is the mass of the marble in grams?
Answer:
The answer is 22 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density = 11 g/cm³
volume = final volume of water - initial volume of water
volume = 4 - 2 = 2 mL
But 1 mL = 1 cm³
2 mL = 2 cm³
volume = 2 cm³
The mass of the marble is
mass = 11 × 2
We have the final answer as
22 gHope this helps you
It is falseIt is ______ that when chloroform, C H C l 3 , is dissolved in water, a conducting solution results. This is because chloroform, C H C l 3 is a _____ that ______ support the movement of charge. that when chloroform, CHCl3 , is dissolved in water, a conducting solution results. This is because chloroform, CHCl3 is a nonelectrolyteIt is ______ that when chloroform, C H C l 3 , is dissolved in water, a conducting solution results. This is because chloroform, C H C l 3 is a ______ that _______ support the movement of charge. that does notIt is ______ that when chloroform, C H C l 3 , is dissolved in water, a conducting solution results. This is because chloroform, C H C l 3 is a ______ that ______ support the movement of charge. support the movement of charge.
Answer:
This question seems unclear as some fragments were repeated. However, the comprehensive question, in addition to the explained answers to fill the gap can be found in the explanation section. The answers are typed in BOLD.
Explanation:
It is _FALSE_ that when chloroform, CHCl3, is dissolved in water, a conducting solution results. This is because chloroform, CHCl3 is a _NON-ELECTROLYTE_ that _DOES NOT_ support the movement of charge.
In contrast to an electrolyte, a NON-ELECTROLYTE is a substance that does not ionize or dissociate into ions (charged atoms) when dissolved in water. Since they do not ionize, they also do not conduct electricity. An example is the Chloroform (CHCl3) described in this question.
Undigested food leaves the body through the...
A small intestine
B rectum
C Oliver
D pancreas
Answer:
That is B. RectumExplanation:
The answer is the rectum because the small intestine takes the nutrients and delivers toxins to the kidneys, and the pancreas is an organ that helps digest hormones that help regulate the way your body processes sugar.
Answer:
B
Explanation:
Rectum.
It's definitly right. I had this on a quiz.
what are some habits of the woodhouse's toads
Answer:
Behavior
Explanation:
Near human habitaciones these toads may congregate underneath outsider lights to feed one the insects the attract.
The compound NaCl (salt) has the same properties as sodium (Na) and chlorine (CI) because it is made of both of those elements. True False
Answer:
False.
Explanation:
Hello.
In this case since sodium is a soft brilliant metal and chlorine is a green gas at normal conditions, they have totally different properties. Thus, since sodium chloride is also known as the table salt which is present as white crystals we can infer that the compound does not have the same properties, therefore it is false.
Regards.
Why do you think some minerals are easier to identify than others?
5. The Santa Ana winds, also known as "devil winds", are strong and dry high-pressure masses of air that begin in the Great Basin mountains and then affect coastal areas in Southern California. Assume that these winds consists of a mixture of nitrogen and oxygen gases that behave ideally and that they begin at a pressure and temperature of 0.705 atm of 22.0 0C, respectively, and that this mass of air is then adiabatically and reversibly compressed to a pressure of 1.00 atm when it descends to the coastal regions. Calculate the final temperature.
Answer:
Explanation:
Given that;
The initial pressure = 0.705 atm
The initial temperature = 22.0° C
The final pressure = 1.00 atm
The objective is to calculate the final temperature,
Since the change occurs adiabatically and reversibly, the final temperature can be calculated by using the thermodynamics equation:
[tex](\dfrac{T_2}{T_1})^r= (\dfrac{P_2}{P_1})^{r-1}[/tex]
where;
r = 7/5 = 1.4
[tex](\dfrac{T_2}{22.0^0})^{1.4}= (\dfrac{1.00}{0.705})^{1.4-1}[/tex]
[tex](\dfrac{T_2}{22.0^0})^{1.4}= (1.418)^{0.4}[/tex]
[tex]T_2 = 22 \times 1.418 ^{^{\frac{0.4}{1.4}}[/tex]
[tex]T_2 = 22 \times 1.418 ^{{0.286}[/tex]
[tex]T_2 =24.31^0 \ C[/tex]
Which element is a non reactive gas?
Lead (82)
Argon (18)
Gold (79)
In terms of the atmosphere, which of the following best describes the oxygen that is present?
It is the solvent in a homogeneous gas mixture.
It is the solute in a heterogeneous gas-liquid mixture.
It is the solvent in a heterogeneous mixture.
It is the solute in a homogeneous gas mixture.
An object in motion has Energy
A: magnetic
B: kinetic
C: possible
D : chemical
If you have a glass capillary tube that is 0.275 mm in radius, and you push it into water then the water will rise, but if you push the capillary into mercury in will create a meniscus below the surface of the fluid. If air is the gas phase, then the surface tension of water at 140oF is 66.2 mN/m and the surface tension of mercury is 470 mN/m. If the contact angle of water on glass is 10oand mercury on glass is 130o, then calculate BOTH height changes.
Answer:
Explanation:
From the given information, the rise in a capillary tube h = [tex]\dfrac{2T cos \theta }{r \rho g}[/tex]
where:
For the height of water:
Surface Tension T = 66.2 mN/m = 66.2 N/m
θ = 10⁰
Cos θ = cos 10 = 0.985
radius r = 0,257 mm = 0.275 × 10⁻³ m
density of water [tex]\rho[/tex] = 1000 kg/m³
g = 9.8 m/s²
∴
replacing our values:
h = [tex]\dfrac{2T cos \theta }{r \rho g}[/tex]
h = [tex]\dfrac{2\times 66.2 \times 10^{-3} \times 0.985}{0.275 \times 10^{-3} \times 1000\times 9.8}[/tex]
h = 0.0484 meteres
h = 48.3 mm
Since the height h = [tex]\dfrac{2T cos \theta }{r \rho g}[/tex]
r = 0.275 mm = 0.275 × 10⁻³ m
the density of mecury now [tex]\rho_H{g}}[/tex]
= 13593 kg/m³
the surface tension of the mercury [tex]T_{Hg} =470 \times 10^{-3} \ N/m[/tex]
θ = 130⁰
Cos θ = cos 130 = -0.6428
Using the same above equation:
h = [tex]\dfrac{2\times 470 \times 10^{-3} \times (-0.6428) }{0.275 \times 10^{-3} \times 13593 \times 9.8}[/tex]
h = -0.016494 m
h = 16.49 mm
Astatine belongs to which element group: nonmetal, halogen, noble gas?
Answer:
halogen
Explanation:
It belongs to Group 17 on the periodic table, which is a halogen
Astatine is a periodic element that is represented as At and has the atomic number of 85. This element belongs to the halogen group of the periodic table. Thus, option b is correct.
What are halogens?Halogens are the group or the families of the periodic table that are characterized by the six elements that are non-metallic in nature. The other halogens are iodine, chlorine, bromine, fluorine, and tennessine.
The astatine element of the halogen group (group 17) is the rarest naturally occurring and have an electronic configuration of [Xe] 4f¹⁴5d¹⁰6s²6p⁵, with atomic number 85.
The isotopes of astatine are not stable and are used to treat a disease like a thyroid in radiotherapy. Also, it is used to treat cancerous cells.
Therefore, option b. the astatine element is a halogen.
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Stereoisomers that are not mirror images of each are ____________ . The chemical and physical properties of two ____________ are different. Isomers that differ only in the way atoms are oriented in space are ____________ . Achiral compounds that contain tetrahedral stereogenic centers are ____________ . Isomers that differ in the way the atoms are connected to each other are ____________ . Stereoisomers that are nonsuperimposable mirror images of each other are ____________ . The chemical and physical properties of two ____________ are identical except in their interaction with chiral substances.
Answer:
Stereoisomers that are not mirror images of each are diasteroisomer . The chemical and physical properties of two diasteroisomers are different. Isomers that differ only in the way atoms are oriented in space are Stereoisomers . Achiral compounds that contain tetrahedral stereogenic centers are meso isomers . Isomers that differ in the way the atoms are connected to each other are structural isomer . Stereoisomers that are nonsuperimposable mirror images of each other are enantiomers . The chemical and physical properties of two enantiomers are identical except in their interaction with chiral substances.
Explanation:
Diasteroisomers are differentiated by the spatial arrangement of atoms, but they are not specular images so they are not enantiomers. In order for two molecules to be diastereoisomers, they must have at least two chiral centers. In one of the centers the substituents are arranged equally in both molecules and in the other they must change.
Enantiomers are specular images but are not superimposable. They have the ability to rotate the polarized light plane
The stereoisomers present the same molecular formula but different spatial rearrangement between their atoms, we can mention the cis and trans isomers where the cis isomers are on the same side of the plane and the trans isomers on opposite sides. They are also known as geometric isomers.
Meso compounds always have more than one asymmetric center and are aquiral. They are distinguished because they present a plane of symmetry.
Structural isomers are those that have different connectivity between their atoms. We can differentiate, for example, metoximethane from ethanol. They will always have the same molecular formula.
Match each set of quantum numbers to the correct subshell description by typing in the correct number.
1: n = 2, l = 0 2p:
2: n = 3, l = 2 3d:
3: n = 1, l = 0 2s:
4: n = 2, l = 1 4f:
5: n = 4, l = 3 1s:
2p: 4
3d: 2
2s: 1
4f: 5
1s: 3
Explanation: got it all right
Answer:
1: n = 2, l = 0 2p: 4
2: n = 3, l = 2 3d: 2
3: n = 1, l = 0 2s: 1
4: n = 2, l = 1 4f: 5
5: n = 4, l = 3 1s: 3
A second calibration standard solution of an iron(III) salicylate complex was prepared in two steps. First, 30.8 mL of a 0.185 M stock solution was diluted with solvent to make 100.0 mL of the first calibration standard solution and, secondly, 78.5 mL of that first calibration solution was diluted to 100 mL to make the second calibration standard. What is the molar concentration of the second calibration standard solution
Answer:
0.0447 M.
Explanation:
We'll begin by calculating the molarity of the diluted solution of the first calibration standard solution. This can be obtained as follow:
Molarity of stock solution (M1) = 0.185 M
Volume of stock solution (V1) = 30.8 mL
Volume of diluted solution (V2) = 100 mL
Molarity of diluted solution (M2) =?
M1V1 = M2V2
0.185 × 30.8 = M2 × 100
5.698 = M2 × 100
Divide both side by 100
M2 = 5.698 / 100
M2 = 0.05698 M
Therefore, the molarity of the diluted solution of the first calibration standard solution is 0.05698 M
Finally, we shall determine the molarity of the second calibration standard solution as follow:
Molarity of first calibration standard solution (M1) = 0.05698 M
Volume of first calibration standard solution (V1) = 78.5 mL
Volume of second calibration standard solution (V1) = 100 mL
Molarity of second calibration standard solution (M2) =?
M1V1 = M2V2
0.05698 × 78.5 = M2 × 100
4.47293 = M2 × 100
Divide both side by 100
M2 = 4.47293 / 100
M2 = 0.0447 M
Therefore, the molarity of the second calibration standard solution is 0.0447 M.
5.If the same distance runner started with a blood sodium ion concentration of 142 mmol/L and drank water equivalent to the volume of sweat lost during the race, what is the runner’s ending sodium ion concentration in mmol/L? Average blood volume is 5.00 L. Report your answer to three significant figures. Hint: If the runner drank as much fluid as was lost, what is the runner’s total blood volume at the end of the race? How many moles of sodium ions were in the runner’s blood at the end of the race?
Here is the missing part of the question.
4. A distance runner is in a 4-hour race and sweats at a rate of 455 mL/hour. The sodium ion concentration in sweat is, on average, 920. mg/L. How many moles of sodium ions were lost during the race? Report your answer to three significant figures.
Answer:
Explanation:
Given that:
the time for the runner = 4 hours
the rate of sweating = 455 mL/hour
Therefore, the total sweating rate = 455 mL/hour × 4 hours
the total sweating rate = 1820 mL
The [tex]Na^+[/tex] conc. in sweat = 920 mg/L
Thus, the total number in grams of [tex]Na^+[/tex] sweat lost = [tex]\dfrac{920}{1000}\times 1820[/tex]
= 1674.4 mg
= 1.6744 grams
number of moles of [tex]Na^+[/tex] sweat lost = mass of [tex]Na^+[/tex] sweat lost/ molar mass of [tex]Na^+[/tex]
number of moles of [tex]Na^+[/tex] sweat lost = 1.6744/ 23
number of moles of [tex]Na^+[/tex] sweat lost = 0.0728 mole
5. concentration of the runner = 142 mmol/L
the average volume of blood = 5.00 L
the number of moles sodium [tex]Na^+[/tex] = concentration × volume
the number of moles sodium [tex]Na^+[/tex] = 142 mmol/L × 5.000 L
the number of moles sodium [tex]Na^+[/tex] = 710 mmol
the number of moles sodium [tex]Na^+[/tex] = 0.710 mol
recall that; the number of moles of [tex]Na^+[/tex] sweat lost = 0.0728 mol
thus, the number of remaining [tex]Na^+[/tex] = (0.71 - 0.0728) mol
the number of remaining [tex]Na^+[/tex] = 0.6372 mol
The runner ending [tex]Na^+[/tex] concentration = 0.6372 mol/ 5.00 L
The runner ending [tex]Na^+[/tex] concentration = 127440 mmol/L
One of the isotopes of sulfur is represented as sulfur-35 or S-35. What does the number 35 signify? A. number of protons B. number of neutrons C. atomic number D. mass number
Answer:
D. Mass number
Explanation:
atomic number is constant since the number of protons and electrons is equal
number of protons is always the same as the number of electrons
the number of neutrons vary from the number of protons therefore causing the difference in mass numbers
Answer:
D. mass number
Explanation:
The largest source of power generated in the US is
A)
fossil fuel combustion.
B)
nuclear.
C)
solar.
D)
wind.
Answer:
A. fossil fuel combustion
Explanation:
is burning of maganisums exothermic or endothermic reaction
Answer:
Exothermic I think
Explanation:
100 POINTS & BRAINLIEST !!!! PLEASE HELP
Answer:
The more you get closer to a substance in the periodic table things that are included into the substance start to get bigger
Explanation:
Anyone know about this ?
Answer:
i think its vinegar
Explanation:
Answer:
Vinegar
Explanation:
It is made with several ingredients, including sugar.
Read this excerpt from Immigrant Kids. The second doctor watched for contagious and infectious diseases. He looked especially for infections of the scalp and at the eyelids for symptoms of trachoma, a blinding disease. Since trachoma caused more than half of all medical detentions, this doctor was greatly feared. He stood directly in the immigrant's path. With a swift movement, he would grab the immigrant's eyelid, pull it up, and peer beneath it. If all was well, the immigrant was passed on. The purpose of this excerpt is to provide information about eye doctors and to explain how they traveled the immigrant’s path. to provide information about eye disease and to explain its medical treatment. to provide information about scalp infections and to explain how they can be prevented. to provide information about trachoma and to explain how it was diagnosed among immigrants.
Answer:
i think its B
Explanation:
Answer:
Its is D
Explanation:
I took the test
A student performed an investigation at sea level. First she placed 400 mL of water in four different containers. Then she placed the containers on hot plates with four different temperature settings, as shown in the table.
Answer:
C. The boiling point of water
Explanation:
We assume your question is the one attached.
Obviously, the shape of the (liquid) water is a function of the container it is in, as it is for any liquid or gas.
The rate of evaporation will depend on the temperature and on the surface area. The different containers are different in both ways, so evaporation is not a constant.
The boiling point is a physical property of the water, so will be the same across all containers.
The amount of steam released is related to the rate of evaporation. It will not be a constant across the different containers.
__
The appropriate choice is ...
The boiling point of water
