Answer:
The work done is 2,907 J
Explanation:
Work is one of the forms of energy transmission between bodies. To perform a job, you must exert a force on a body and it moves. In other words, when a force is applied to a body and it moves, work is done.
The work is equal to the product of the force by the distance and by the cosine of the angle that exists between the direction of the force and the direction that the moving point or object travels:
W = F * d * cos α
In the International System of Units the Force is expressed in newtons and the distance in meters, so the work will have units of newtons. Meter = joules (J).
In this case:
F= 255 Nd= 11.4 mα=0Replacing:
W= 255 N* 11.4 m* cos 0
Solving:
W= 255 N* 11.4 m* 1
W= 2,907 J
The work done is 2,907 J
The work done by the sailor is 2907 joules (J).
To calculate the work done by the sailor, we can use the formula for work:
[tex]\[\text{Work} = \text{Force} \times \text{Distance} \times \cos(\theta)\][/tex]
where:
- [tex]\(\text{Force}\)[/tex] is the force exerted by the sailor,
- [tex]\(\text{Distance}\)[/tex] is the distance over which the force is applied,
- [tex]\(\theta\)[/tex] is the angle between the force and the direction of movement.
If the force is applied in the direction of the movement, [tex]\(\theta = 0\)[/tex] degrees and [tex]\(\cos(0) = 1\)[/tex].
Given:
- [tex]\(\text{Force} = 255 \, \text{N}\)[/tex]
- [tex]\(\text{Distance} = 11.4 \, \text{m}\)[/tex]
- [tex]\(\theta = 0\)[/tex] degrees (assuming the force is in the direction of the movement)
Substitute these values into the formula:
[tex]\[\text{Work} = 255 \, \text{N} \times 11.4 \, \text{m} \times \cos(0)\][/tex]
[tex]\[\text{Work} = 255 \, \text{N} \times 11.4 \, \text{m} \times 1\][/tex]
[tex]\[\text{Work} = 2907 \, \text{J}\][/tex]
How many grams of Fe2O3 will be produced from
24.0 g of Fe and 5.00 g of O2?
Answer:
16.6g
Explanation:
7) What is the hydrogen concentration of a solution with a pH of 2.1? *
The correct answer is Hydrogen concentration = 7.94×10^-3 M
What is hydrogen concentration?
The hydrogen ion concentration generally found in many chemical and biological systems are very small, and often in the range of 10 -2 to 10 -12 mol L -1.pH = -log[H+]2.1 = -log[H+]2.1/-log = -log[H+]/-log10^-2.1 = [H+][H+] = 7.94×10^-3Mlearn more about pH concentration below,
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Calculate the equilibrium constant, k, at 25°c for the galvanic cell reaction shown below: 8 h+(aq) + 5 fe2+(aq) + mno4-(aq) → mn2+(aq) + 5 fe3+(aq) + 4 h2o(l) e° = +0.74 v enter your answer in exponential format (sample 1.23e-4) with two decimal places and no units.
Answer:
Equilibrium Constant = (3.60 × 10⁶²)
Explanation:
The change in Gibb's free energy for a galvanic cell is given as
Δ = -nFE°
where n = number of electrons transferred = 5 for this reaction
F = Faraday's constant = 96500 C
E° = cell potential = +0.74 V
But the change in Gibb's free energy for galvanic cell reaction is also given as
ΔG = -RT In K
R = molar gas constant = 8.314 J/mol.K
T = absolute temperature in Kelvin = 25 + 273.15 = 298.15 K
K = Equilibrium constant.
Equating these two expressions
-nFE° = - RT In K
RT In K = nFE°
In K = (nFE°) ÷ (RT)
In K = (5 × 96500 × 0.74) ÷ (8.314 × 298.15)
In K = 144.04
K = e^(144.04)
K = (3.60 × 10⁶²)
Hope this Helps!!!
The equilibrium constant for the galvanic cell has been [tex]\rm \bold{e^1^4^4^.^0^4}[/tex].
Gibb's free energy has been defined as the reversible work performed by the thermodynamic system.
The Gibbs free energy can be given as:
[tex]\Delta[/tex]G = -nF[tex]\rm E^\circ[/tex]
The [tex]\Delta[/tex]G for the galvanic cell can also be given as:
[tex]\Delta[/tex]G = -RT ln K
Thus, for the galvanic cell:
-nF[tex]\rm E^\circ[/tex] = -RT ln K
There has been the transfer of 5 moles of electrons, thus:
- 5 mol × 96500 C × 0.74 V = - 8.314 J/mol.K × 298.15 K × In Equilibrium constant (K)
357,050 = 2,478.8191 K
In K = 144.04
K = [tex]\rm e^1^4^4^.^0^4[/tex]
The equilibrium constant for the galvanic cell has been [tex]\rm e^1^4^4^.^0^4[/tex].
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What is the volume of 64 g of oxygen gas 02 at STP
Answer:
The volume would be 44.8 L
Explanation:
Message me for extra information
parkguy786 snap
A 56.8g sample of aluminum is heated from 79.5°C to 143.7°C. The specific heat capacity of aluminum is 0.900 J/(g*K). Calculate the heat absorbed.
A) 3280 J
B) 4440 J
C) 6220 J
D) 11400 J
Answer:
I think the answer is A.
The heat absorbed should be option A. 3,280 J.
Calculation of the heat absorbed:Since A 56.8g sample of aluminum is heated from 79.5°C to 143.7°C. The specific heat capacity of aluminum is 0.900 J/(g*K).
So based on this, the following formula should be applied
= Mass of substance * specific heat * change in temperature
= 56.8 * 0.900 J * (143.7 - 79.5)
= 56.8 * 0.900 J * 64.2
= 3,280 J
hence, the first option is correct.
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The environment with the greatest biodiversity is the one with the greatest variety of
Final answer:
The greatest biodiversity is found in environments with a wide variety of ecosystems, especially in the tropics. Biodiversity, which includes all life forms and ecosystems, is crucial for ecological balance and human well-being. Despite its importance, biodiversity is at risk due to inadequate knowledge and human activities.
Explanation:
The environment with the greatest biodiversity is the one with the greatest variety of ecosystems. Biodiversity encompasses all of the variety of life that exists on Earth, including the diversity of genes, species, and ecosystems. It's well-documented that biodiversity is highest in the tropics, which is home to numerous endemic species and biodiversity hotspots. The variety of ecosystems ranging from coral reefs to prairies contributes to this richness in species. Yet, despite the high biodiversity in such regions, there is also a significant risk of biodiversity loss due to limited knowledge about these species and the impact of human activity.
The importance of biodiversity extends beyond the ecological realm and significantly affects human health and agriculture. A diverse array of species contributes to the robustness of ecosystems, which is essential for the survival and welfare of human populations. The loss of biodiversity can upset the interconnectedness of species, leading to detrimental impacts on the environment and human societies.
What was the initial volume of gas if a new volume of 3.00 liters is obtained when the pressure is decreased from 3.00 atm to 1.00 atm at constant temperature?
Answer:
1 L
Explanation:
V1=P2V2/P1
Checking this, it is correct because P and V at constant T has an inverse relationship.
- Hope that helps! Please let me know if you need further explanation.
In a hair dryer, if current follows a SINGLE path through the heater and the fan, the circuit in the hair dryer is connected____
Answer:
heat energy
Explanation:
In a hair dryer, if the current follows a single path through the heater and the fan, the circuit in the hair dryer is connected in a series.
Explanation:In a hair dryer, if the current follows a single path through the heater and the fan, the circuit in the hair dryer is connected in a series.
When components in a circuit are connected in series, they are connected end-to-end, with the current having only one path to flow through. In this case, the current flows through the heater and the fan in a single loop.
Series circuits are commonly used in hair dryers and other electrical appliances, as they ensure that all components receive the same current.
all plants and animals have mechanisms or ways to
a. transport nutrients within the cell
b. perform photosynthesis
c. regulate nerves
d. produce flowers
Answer:
I think A sorry if its wrong
Explanation:
All plants and animals have mechanisms or ways to transport nutrients within the cell. The correct option is a.
What is the transport of nutrients?Water is a nutrient that aids in the movement of substances through our bodies and the control of body temperature. The growth, development, and maintenance of the tissues and cells in our bodies depend on minerals like calcium and iron.
While the Phloem carries organic nutrients in plants, the Xylem carries water and minerals.
Animals' intestines absorb the water we drink, which is then transported throughout the body as bodily fluids like blood. These carry out a variety of tasks that keep us alive. They provide the cells with oxygen and nutrition and remove waste products, which are eventually expelled through urination.
Therefore, the correct option is a. transport nutrients within the cell
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An ionic compound is typically formed between?
Answer:
Da Answer
Explanation:
Ionic bonds formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal.
An ionic compound is typically formed between a metal, which becomes a cation, and a nonmetal, which becomes an anion. The ions are held together by electrostatic attractions known as ionic bonds, producing a neutral compound.
An ionic compound is typically formed between a metal and a nonmetal. This occurs when the metal atom loses one or more electrons, forming a positively charged ion known as a cation, while the nonmetal atom gains those electrons, forming a negatively charged ion known as an anion. The resulting ionic compound is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
For example, sodium metal (Na), which is from group 1 of the periodic table, tends to lose one electron and become a sodium cation (Na+). Chlorine gas (Cl2), from group 17 of the periodic table, can accept one electron to form two chloride anions (Cl-). When these ions combine, they form sodium chloride (NaCl), where each sodium ion is paired with a chloride ion, making the compound neutral as a whole, with a zero net charge.
Oxygen decays to form nitrogen.
150
15N + ºe
This type of nuclear decay is called
DONE
Answer: beta plus decay
Explanation:
just did it on edge :)
Answer:
The answer is C) beta plus decay
Explanation:
I took the assignment, i hope it helps
Multiple Choice
A scientist performs an experiment on an unknown element. She finds that the unknown element forms an ionic bond with beryllium (Be). She concludes that the unknown element must belong in group 2 of the periodic table. State whether or not you think this result supports her conclusion, and why.
A) No. Beryllium is in Group 2 and is unlikely to react with another Group 2 element.
B) No. Group 2 elements are generally unlikely to react at all.
C) Yes. In an ionic bond, elements share an electron, so this is a logical conclusion.
D) Yes. Ionic bonds only form between elements of the same group.
Answer:
A
Explanation:
I Took the test
A metal does not form ionic bond with other metals. All the group 2 elements are metals. They cannot form compounds with each other. Therefore, option A is correct.
What is ionic bonding ?Ionic bonds are formed between metals and non-metals. Metals are all electropositive and they easily loss electrons to form corresponding cations.
Non -metals are mostly electron deficient and will gain electrons from metals to achieve octet. Non-metals form their anions and they combine with the cations electrostatically form the ionic bond.
No two metals can form a compound together. They both form positive ions and repel each other. Therefore, beryllium cannot form compounds with elements of its own group which are all metals. Hence, option A is correct.
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what occurs when a reaction reaches equilibrium
Answer: the rate of the forward reaction is equal to the rate of the reverse reaction
Explanation:
A chemical reaction reaches equilibrium when the rates of the forward and reverse reactions are equal, causing the reactant and product concentrations to remain constant, signifying a dynamic equilibrium. If disturbed, the system will adjust to restore equilibrium.
Explanation:When a chemical reaction reaches equilibrium, it means that the rate of the forward reaction is equal to the rate of the reverse reaction. This state is referred to as a dynamic equilibrium because the reactions continue occurring but the concentrations of the reactants and products remain unchanged. The reaction quotient (Q) equates to the equilibrium constant (K) at this point, and the system's macroscopic properties stay constant. If the system at equilibrium is disturbed by changing conditions, such as a change in reactant concentration, the system will adjust itself to re-establish equilibrium according to Le Chatelier's principle.
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Identify the acid-conjugate base pair in this balanced equation:
H2SO4 + 2NaOH → 2H2O + Na2SO4
H2SO4/H2O
H2SO4/Na2SO4
NaOH/H2O
NaOH/Na2SO4
Answer:
The answer is B. H2SO4/Na2SO4
Explanation:
Answer:
b
Explanation:
What mass of H₂O is formed when excess H₂ reacts with 64 g of O₂? *
2H2+O2 -->2H2O
Answer: 72g
Answer:
72g of H2O.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2H2 + O2 —>2H2O
Next, we'll determine the mass of O2 that reacted and the mass of H2O produced from the balanced equation.
This is illustrated below:
Molar Mass of O2 = 16x2 = 32g/mol
Molar Mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g
Summary:
From the balanced equation above,
32g of O2 reacted to produce 36g of H2O.
Now, we can obtain the mass of H2O produced when 64g of O2 react as follow:
From the balanced equation above,
32g of O2 reacted to produce 36g of H2O.
Therefore, 64g of O2 will react to produce = (64 x 36)/32 = 72g of H2O.
From the calculations made above, 72g of H2O is produced from the reaction.
5. Rocks and sediment change their form as they move through the rock cycle. Which change
involves melting?
O
lava to rock
O magma to lava
O
rock to magma
rock to sediment
Submit
.
Answer:
Rock to Magma
Explanation:
Lava to Rock is incorrect because its "Freezing" The Lava
Magma to Lava basically a name change. No type change.
Rock to Sediment is Erosion of the rock.
Rock to Magma Is the Rock being super-heated, melting it. Similar to Ice and water but more extreme.
Rocks and sediment change their form as they move through the rock cycle.Rock to magma change involves melting. Therefore, option C is correct.
What causes rock to change into magma?Any rock type can be altered to form a metamorphic rock by extreme pressure from burial, increasing temperature at depth, and a long period of time. If the newly formed metamorphic rock is allowed to continue heating, it will eventually melt and become molten (magma).
The rock is pulled down by movements in the earth's crust and becomes increasingly hot as it descends. It takes temperatures ranging from 600 to 1,300 degrees Celsius (1,100 to 2,400 degrees Fahrenheit) to melt a rock, transforming it into magma (molten rock).
Rock to magma is the Rock being overheated and melting? Ice and water are similar, but more extreme.
Thus, option C is correct.
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A plane flew for 2 hours at 467 mph and 5 hours at 536 mph. How far did the plane fly in miles
Answer:
The plane flew for a total of 3, 614 miles.
Explanation:
Speed, V = [tex]\frac{distance}{time}[/tex]
Since units is given in miles per hour (mph), there isn't any need to convert to standard units.
Solving for distance = speed × time
∴ Total distance travelled
= (2 × 467) + (5 × 536)
=3, 614 miles.
Answer:
The plane flew 3614 miles
Explanation:
What would the molecular formula be if lithium and sulfur reacted to form a neutral compound?
A. Li2S2
B. LiS2
C. LiS
D. Li2S
Answer:
D
Explanation:
Lithium has one valence electron, so it has one to give away to have an outer shell of 8.
Sulfur has 6 valence electrons, so it needs 2 to get an outer shell of 8.
If we have two Li, that means sulfur will get 2 e- and Li will give away 2 e-, so the formula is Li₂S.
A helium-filled balloon has a volume of 2.48 L and a pressure of 150 kPa. The volume of the balloon increases to 2.98 L after you climb up a very steep mountain with this balloon. (Temperature is kept constant). Be sure to answer both parts A and B. A. What is the new pressure of the helium gas? (For full credit, write the appropriate gas law formula, list the givens in the problem, indicate what the unknown is, and give your calculated answer). B. Use the kinetic molecular theory to explain why the volume of the gas changed in this scenario.
Answer:
THE NEW PRESSURE OF THE HELIUM GAS AT 2.98 L VOLUME IS 124.8 kPa.
AT AN INCREASE ALTITUDE, THERE IS A LOWER PRESSURE ENVIRONMENT AND THE HELIUM GAS PRESSURE DECREASES AND HENCE AN INCREASE IN VOLUME.
Explanation:
The question above follows Boyle's law of the gas law as the temperature is kept constant.
Boyle's law states that the pressure of a fixed mass of gas is inversely proportional to the volume, provided the temperature remains constant.
Mathematically, P1 V1 = P2 V2
P1 = 150 kPa = 150 *10^3 Pa
V1 = 2.48 L
V2 = 2.98 L
P2 = ?
Rearranging the equation, we obtain;
P2 = P1 V1 / V2
P2 = 150 kPa * 2.48 / 2.98
P2 = 372 *10 ^3 / 2.98
P2 = 124.8 kPa.
The new pressure of the gas when at a height which increases the volume of the helium gas to 2.98 L is 124.8 kPa.
Which sample would have the same number of molecules as 11.2L of He (g) at 273K and 202kPa?
1) 11.2L of N2(g) at 300K and 202kPa
2) 22.4L of Ne(g) at 546K and 404K
3) 11.2L of CH4(g) at 273K and 202kPa
Answer: 11.2 L of [tex]CH_4(g)[/tex] at 273K and 202kPa
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 202 kPa = 1.99 atm ( 1kPa= 0.0098 atm)
V = Volume of gas = 11.2 L
n = number of moles = ?
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]273K[/tex]
[tex]n=\frac{PV}{RT}[/tex]
[tex]n=\frac{1.99\times 11.2}{0.0821 L atm/K mol\times 273K}=0.99moles[/tex]
According to avogadro's law, equal number of moles occupy equal volumes and contain equal number of molecules at same temperature and pressure conditions.
As 11.2 L of [tex]CH_4(g)[/tex] at 273K and 202kPa will have same moles as 11.2L of He (g) at 273K and 202kPa, thus they have same number of molecules.
Using Avogadro's Law which states that equal volumes of gas at the same temperature and pressure have the same number of molecules, the gas that has the same number of molecules as 11.2L of He (g) at 273K and 202kPa would be 11.2L of CH4(g) at 273K and 202kPa.
Explanation:The concept we need to understand to answer this question is the Avogadro's law, which states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules. Thus, regardless of the specific gas, 11.2L of any gas at 273K and 202kPa will have the same number of molecules.
Therefore, the sample that would have the same number of molecules as 11.2L of He (g) at 273K and 202kPa would be 11.2L of CH4(g) at 273K and 202kPa. The other two samples have different conditions and thus would not have the same number of molecules.
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how many moles of cacl2 will be produced from 3.572 g of ca(oh)2 reacting with hcl
Answer:
0.04821 mol CaCl₂
Explanation:
Ca(OH)₂ + 2 HCl ⇒ CaCl₂ + H₂O
This is your reaction.
We need the chemical equation to know the stoichiometry (the numbers that in front of the compounds). Since we are converting from Ca(OH)₂ to CaCl₂, you only need to focus on these compounds. There are no numbers in front of Ca(OH)₂ and CaCl₂, so the ratio of the compounds is 1:1.
Now, convert grams of Ca(OH)₂ to moles of Ca(OH)₂. The molar mass is 74.09 g/mol.
[tex]3.572 g*\frac{mol}{74.09g} =0.04821 mol[/tex]
Using moles of Ca(OH)₂ and the ratio from the stoichiometry, convert moles of Ca(OH)₂ to moles of CaCl₂. Since the ratio is 1:1, the moles will be equal.
[tex]0.04821mol*\frac{1mol}{1mol} =0.04821mol[/tex]
You will produce 0.04821 moles of CaCl₂.
0.04821 mol CaCl₂ will be produced from 3.572 g of [tex]Ca(OH)_2[/tex] reacting with HCl.
Reaction:-
Ca(OH)₂ + 2 HCl ⇒ CaCl₂ + H₂O
The ratio of the compounds is 1:1 because we are converting from Ca(OH)₂ to CaCl₂. There are no numbers in front of Ca(OH)₂ and CaCl₂ because we are converting from Ca(OH)₂ to CaCl₂.
Now, convert grams of Ca(OH)₂ to moles of Ca(OH)₂. The molar mass of Ca(OH)₂ is 74.09 g/mol.
[tex]Number\ of \ moles=\frac{Mass}{Molar\ mass}[/tex]
[tex]\frac{3.572\ g}{74.093\ g/mol} \\=0.0482\ mol[/tex]
Hence, the 0.0482 moles of CaCl₂ will be produced.
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Which phase of matter completely fills its container?
A. Gas
B. None of these
C. Liquid
D. All of these
Answer:
C. Liquid
Explanation:
Gas has no definite shape but liquid takes form of whatever container it is placed in
How are atmospheric carbon dioxide levels and average global temperature related?
A. There is a positive relationship.
B. Temperature is the clear cause of carbon dioxide levels.
C. They are not related.
D. There is a negative correlation.
Answer:
B Temperature is clear cause of carbon dioxide levels
Answer:
B Temperature is clear cause of carbon dioxide levels
Explanation:
Increases in greenhouse gases such as carbon dioxide (CO2) result in the atmosphere retaining more heat.
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⊕ΘΞΠΤ⊕
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A sample of a halogen gas has a mass of 0.239 g and exerts 600.0 Torr at 140C in a 100.0 mL flask.
a. Calculate the molar mass of the halogen.
b. Calculate the density of the gas at 1.00 atm and 298 K.
show work please
Answer:
Molar mass = 102.5 g/mol
Density = 4.19 g/L
Explanation:
To find the molar mass, we first need to find how many moles are in the sample. To do this, we can use the PV=nRT equation.
P = 600 torr * (1 atm/760 torr) = 0.79 atm
V = .1 L
n = this is the number of moles and what you are solving for
R = gas constant = 0.08206 L*atm/moles*K
T = 140 C + 273 = 413 K
Plug these values into the PV=nRT equation:
n = (.1 L*.79 atm)/(0.08206*413 K)/
n = .00233 moles
To find the molar mass divide the grams by the moles
0.239 g / .00233 moles = 102.5 g/mol
For the second part of the problem, you need to use this equation:
d (denstiy) = (P*molar mass)/ R*T
d = (1 atm * 102.5 g/mol) / (.08206*298 K)
d = 4.19 g/L
The molar mass of the halogen gas is 12.39 g/mol. The density of the gas at 1.00 atm and 298 K is 0.505 g/L.
Explanation:a. To calculate the molar mass of the halogen gas, we can use the ideal gas law equation:
PV = nRT
Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
First, let's convert the temperature from Celsius to Kelvin:
T = 140 °C + 273.15 = 413.15 K
Next, let's convert the pressure from Torr to atm:
P = 600.0 Torr / 760.0 Torr/atm = 0.7895 atm
Now, let's rearrange the ideal gas law equation to solve for the number of moles:
n = PV / RT
Substituting the given values:
n = (0.7895 atm * 0.1000 L) / (0.0821 atm L/mol K * 413.15 K)
n = 0.01928 mol
Finally, let's calculate the molar mass by dividing the mass of the sample by the number of moles:
Molar mass = 0.239 g / 0.01928 mol = 12.39 g/mol
b. The density of a gas can be calculated using the ideal gas law equation:
density = (molar mass * pressure) / (gas constant * temperature)
Using the given values:
density = (12.39 g/mol * 1.00 atm) / (0.0821 atm L/mol K * 298 K)
density = 0.505 g/L
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Initial temperature of metal =
°C
Initial temperature of water =
Final temperature of both =
DONE
Answer:
the correct answers is 100 22.7 and 24.6
Explanation:
did it on edgunity
The metal is initially heated to a temperature of 100°C. The water's original temperature is 22.4 °C. Both have a final temperature of 27.1°C.
What is the initial temperature?The initial temperature, which is established following the movement or movement of the full and closed container, is indeed the average temperature of the lowest container to be taken into account at the start of the hot temperature cycle.
Initial temperature refers to the average interior temperature of the coldest processing container at the start of the thermal processing cycle, as assessed following a thorough stir or shake of the filled and sealed containers.
Thus, the metal is initially heated to a temperature of 100°C. The water's original temperature is 22.4 °C. Both have a final temperature of 27.1°C.
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Your question is incomplete, most probably the complete question is:
Measure the initial temperature of the water to the nearest 0.1c record in the date table.
Initial temperature of metal =
°C
Initial temperature of water =
Final temperature of both =
The best definition of a proxy record is:
A. Scientific measurements that are indirect and not recorded with instruments.
B. Scientific measurements that use one set of data to represent another set of data in a calculation.
C. Scientific measurements made using proximal distances between data points.
D. Scientific measurements that contain data points that are average approximations of specific measurements.
D. Scientific measurements that contain data points that are average approximations of specific measurements.
What is a proxy indicator for the climate?A proxy climate indicator is a local record that is interpreted using physical or biophysical principles to represent some combination of climate-related variations back in time.
These proxy data are preserved physical characteristics of the environment that can stand in for direct measurements. Paleoclimatologists gather proxy data from natural recorders of climate variability such as corals, pollen, ice cores, tree rings, caves, pack rat middens, ocean and lake sediments, and historical data.
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the width of a garden is (4x-1) feet and the length is 2x feet. Find the perimeter of the garden.
Answer:
6x-1 feet
Explanation:
perimeter = ( 4x-1 ) + 2x
= 6x-1 feet
3) Lithium metal (Li) react with hydrosulfuric acid (HS) to produce hydrogen gas and magnesium chloride (Li 2 S) . How many grams of Lithium metal are required to react completely with excess acid to produce 4.5 L of Hydrogen at 315K and 1.258 atm? Remember to balance the equation .
Answer:
3.066g
Explanation:
Step 1:
The balanced equation for the reaction. This is given below:
2Li + H2S —> Li2S + H2
Step 2:
Data obtained from the question.
Volume (V) of H2 = 4.5L
Temperature (T) = 315K
Pressure (P) = 1.258 atm
Note:
Gas constant (R) = 0.0821atm.L/Kmol
Number of mole (n) of H2 =..?
Step 3:
Determination of the number of mole of H2 produced.
This can be obtained by using the ideal gas equation as follow
PV = nRT
Divide both side by RT
n = PV /RT
n = 1.258 x 4.5 / 0.0821 x 315
n = 0.219 mole
Therefore, 0.219 mole of H2 is produced.
Step 4:
Determination of the number of mole of Li that will produce 0.219 mole of H2.
This is shown below:
2Li + H2S —> Li2S + H2
From the balanced equation above,
2 moles of Li reacted to produce 1 mole of H2.
Therefore, Xmol of Li will react to produce 0.219 mole of H2 i.e
Xmol of Li = 2 x 0.219
Xmol of Li = 0.438 mole
Step 5:
Conversion of 0.438 mole of Li to grams.
Number of mole of Li = 0.438 mole
Molar Mass of Li = 7g/mol
Mass = number of mole x molar Mass
Mass of Li = 0.438 x 7
Mass of Li = 3.066g
Therefore, 3.066g if Li is needed for the reaction.
Students are provided with a choice of two solutions. Each one is used to test the presence of a different chemical. How could students use one of these solutions to gather evidence for the action of photosynthesis?
Answer:
use fehling's Solution on the plant leaves exposed to light and on the plant leaves covered in aluminium foil for a week
Explanation:
This can be found out by using fehling's Solution on the plant leaves exposed to light and on the plant leaves covered in aluminium foil for a week.
This will gather evidence for the action of photosynthesis.
which nuclide is most likely to be radioactive and synthetic
24/12 Mg
237/93Mg
195/78Mg
230/84Mg
Answer:
237/93 np
Explanation:
sub to tkwick