In a study exploring the effects of attendance on student grades in science class, attendance would be the independent variable as it's the factor being manipulated, and the student grades would be the dependent variable as they are potentially affected by attendance. A possible hypothesis could be: 'Regular attendance in science class leads to higher grades for students.'
Explanation:In a scientific study targeting the influence of attendance on student grades in science class, the independent variable (IV) would be the attendance, representing the factor that can be manipulated or that changes naturally. The dependent variable (DV) on the other hand, would be the student grades, as these are potentially influenced or changed by the attendance rate.
A possible hypothesis could be: 'Regular attendance in science class leads to higher grades for students.' This hypothesis suggests that if a student frequently attends their science class (IV), then their grades (DV) might improve.
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HELP FAST PLZ I WILL MARK YOU BRAINLIST
1. which is NOT a part of a seed?
A none of the above
B endosperm
C seed coat
D embryo
2. when seedsr are not in the correct environment, they do not grow. they are asleep. which term best describes the seeds state at that state?
A fake
B dormant
C abnormal
D dead
3. which part of the plant does the seed rely on for energy in order to begin to grow?
A embryo
B endosperm
C seed coat
D photosynthesis
4. when plants begin to grow, it is called:
A none of the above
B germination
C photosynthesis
D plant growth
5. what is the function of roots?
A absord minerals
B absorb water
C stability
D all of the above
6. once the plant has sprouted, the plant no longer needs the endosperm for engrey.
A true
B false
A force of 200N is needed in order to push a wheelbarrow that weights 1000N. If the wheelbarrow is pushed 30m, how much work is done on the wheelbarrow? What power is required if it takes 10 seconds to push the wheelbarrow?
The work done on the wheelbarrow is 6000 Joules, and the power required to do this work in 10 seconds is 600 Watts.
Explanation:The question asks about the concepts of work, force, and power in a real-world situation. In this case, we can use the equation for work, which is Work = Force x Distance. Given that the force is 200N and the distance is 30m, then by multiplying these two, the work done on the wheelbarrow is 6000 Joules.
Power, on the other hand, is the rate at which work is done. It is computed as Work Done ÷ Time Taken. If the work done is 6000 Joules and it takes 10 seconds, the power required would be 600J/sec or 600W (Watts).
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If white light shines on an object and the red, orange, green, blue, indigo, and violet light is absorbed. What color does your eye see?
If white light shines on an object and all colors except yellow are absorbed, the object will appear yellow. This is because the object reflects the yellow light and our brain processes this to determine the object's color.
Explanation:When white light shines on an object and red, orange, green, blue, indigo, and violet light is absorbed, the color your eye will see is the one that is not absorbed—in this case, yellow. This phenomenon occurs because the object is reflecting the yellow light while absorbing all the other colors. The mixture of light frequencies that enter our eyes is processed by the brain, allowing us to perceive the color of objects based on which light waves are reflected and which are absorbed.
White light is composed of all the colors of the visible spectrum. If an object absorbs all colors except one, the color reflected by the object is the color we perceive. In our example, since all colors except yellow are absorbed, the objects appears yellow. This is a direct result of the complementary colors concept, as our eyes and brain perceive the complement of the absorbed colors.
Calcium and sulfur ionic compound or non ionic?
Final answer:
Calcium and sulfur combine to form the ionic compound calcium sulfide, written as CaS, due to the metal calcium cation combining with the nonmetal sulfur anion to balance the charges.
Explanation:
A compound consisting of calcium and sulfur forms an ionic compound. Calcium is a group 2 element and forms a calcium cation (Ca2+), while sulfur is a group 16 element and forms a sulfide anion (S2-). In an ionic compound, the total charge of the cations and anions must be equal. Therefore, one calcium ion will combine with one sulfur ion to form the compound calcium sulfide, which is written as CaS. This compound is ionic because it consists of a metal (calcium) and a nonmetal (sulfur) element.
Examine the drawing of atoms of “fool’s gold.” This substance is called pyrite, Fe2S. Is pyrite a molecular substance or a network substance?
Answer:
Pyrite is a network substance.
Explanation:
I just know.
Answer:
For plato users:
Pyrite is a Network Substance
Explanation:
Provide at least three indicators of a chemical change that are present in burning a piece of paper.
Answer:
Some chemical indicators perceived while a piece of paper is burning are:
Production of an Odor: there is a smell of burnt paper
Change in Temperature: combustion is a highly exothermic reaction , so the temperature increase
Change in Color: paper changes to ashes as the burning process occurs
How many moles of water molecules are in 6.81 g of magnesium sulfate heptahydrate (Epsom salts
Which types of clouds are bright white ad fluffy,sometimes forming shapes or pictures?
Options:
1.)Cirrus
2.)Stratus
3.)Cumulus
What is the volume of the item described?
A rocket in the shape of a cylinder with radius 6 m and height 16 m with a cone on top of radius 6 m and height 3 m.
Select the exact answer in terms of π and the approximate answer rounded to the nearest whole number.
A. 2149 m³
B. 1922 m³
C. 684 π m³
D. 102 π m³
E. 320 m³
F. 612 π m³
Volume and surface area are the two important properties of any three dimensional shape. The cylinder is a three dimensional shape with a circular base. Here the volume is 612 π m³. The correct option is F.
What is the volume of a cylinder?The volume of a cylinder is defined as the density of the cylinder which signifies the amount of material it can carry or how much amount of any material can be immersed. A cylinder can be seen as a set of circular disks which are stacked on one another.
The volume of the cylinder is given by the formula:
V = Πr²h
r = 6m and h = 16 m
So volume is:
V = Π × (6)² × 16 = 576 Πm³
The volume of the cone is given as:
Volume = 1/3 × Π × r² × h
r = 6m and h = 3m
V = 1/3 × Π × (6)² × 3 = 36 Πm³
So the total volume = 576 Πm³ + 36 Πm³ = 612 πm³
Thus the correct option is F.
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A total of 25.0 mL of 0.150 M potassium hydroxide (KOH) was required to neutralize 15.0 mL of sulfuric acid (H2SO4) of unknown concentration. What is the concentration of the sulfuric acid? Balanced Equation: Acid-Base Titration Solution? Molar Ratio? Volume? Concentration? Acid (unknown) Base (known)
Without the process of transpiration, what might happen to a plant?
A.
It might turn orange.
B.
It would grow more slowly.
C.
It would have fewer leaves.
D.
It might burst.
Transpiration is the process of release of water from the plants. In the absence of transpiration, the plant bursts. Thus, option D is correct.
How the process of transpiration takes place?The transpiration process is the release of water from the plants through stomata. The pressure of water allows the movement of the stomatal guard cell, and the stomata opens.
The opening of stomata releases the water inside the plants, and release of pressure results in the relaxation of stomata, thereby closing the stomata.
The absence of transpiration in plants results in the accumulation of water inside the body. The access water in the body exerts the force to the plant body, and it may burst.
Therefore, in the condition of loss of transpiration by the plants, the plant may burst out. Thus, option D is correct.
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This is a body of water along the coast where freshwater from rivers and streams meets and mixes with salt water from the ocean. You could call this a place of transition from land to sea and freshwater to salt water. It is a(n) A) bay. B) estuary. C) sea. D) swamp.
You use a balance to find the mass of a folded newspaper. Then you run it through a shredder. Predict its mass after being shredded. A) The two masses cannot be compared because a physical change has occcured. B) The mass of the shredded paper will be equal to the mass of the folded paper. C) The mass of the shredded paper will be less than the mass of the folded paper. D) The mass of the shredded paper will be greater than the mass of the folded paper.
Answer:
its A
Explanation:
Anhydrous calcium chloride removes water vapor from the air inside a container having an air-tight seal called a desiccator. Explain
Anhydrous calcium chloride is a desiccant used to remove water vapor from the air in a desiccator to protect sensitive samples. It has a high affinity to water, indicating its saturation by changing the color of indicators like cobalt chloride, and is essential for maintaining sample integrity in laboratories.
Anhydrous calcium chloride (CaCl₂) is a desiccant used to remove water vapor from the air within a sealed container known as a desiccator. This desiccator is often employed to ensure that samples do not reabsorb moisture from the air after being heated or dried. Anhydrous calcium chloride's high affinity for water allows it to effectively absorb water vapor, turning into a hydrated form of the compound.
By using indicators such as cobalt chloride (CoCl₂), which changes color from blue to pink upon hydration, one can easily monitor the status of the drying agent. This is essential because once the desiccant has absorbed all the water it can, it becomes less effective and should be replaced or regenerated. Other hygroscopic substances like Magnesium Chloride (MgCl₂) and calcium sulfate (CaSO₄) can also serve as desiccants, though their water affinity may vary.
Desiccators are also equipped with perforated plates to hold samples and sometimes a stopcock for evacuation. In laboratory settings, drying agents are critical for maintaining the integrity of various chemicals and samples that can be compromised by the presence of water. As such, the selection of an appropriate desiccant and proper use of a desiccator are important laboratory techniques.
Which wave has a disturbance that is perpendicular to the wave motion?
A. No wave has a disturbance that is perpendicular
B. Transverse
C. Surface
D. Longitudinal
Answer:The correct answer is option B.
Explanation:
Transverse waves are the waves with oscillation vibrating perpendicular the propagation of the wave.
Whereas, Surface wave is the wave which travels across the surface of the earth.
Longitudinal wave is the wave in which medium vibrates in the same direction of the propagation of the wave.
Describe how to separate a mixture of pigments from an ink cartridge. Enter your answer in the space provided.
You would use Chromatography. I hope that this answer helps :)
What are the steps that 1-pentyne goes through to become N-ethyl pentanamide?
what scientist design an experiment that enabled the first successful detection of an individual particle
Citric acid has a pH between 1 and 3. It is considered to be a
Answer:
Strongly acidic
Explanation:
pH scale test for the alkalinity and acidity level of a particular substance. The pH scale range from 0 - 14. The lower the pH value the higher the acidity contents while the higher the pH value the higher the alkalinity.
pH values of 1 - 3 depict strongly acidic contents as the value increases the acidity content reduces . Usually a pH value of 7 depicts neutrality. That is it is neither acidic nor alkaline. pH value higher than 7 is heading towards alkalinity.
Acidic content contains the hydrogen ion(H+) while the alkaline content contains the hydroxide ions(OH-). The combination of this ions, forms water molecule(H2O).
a plant root is an example of .
a cell
an organ system
an organ
tissue
The answer is an organ.
Answering the question, a plant root is an example of an organ
Plant consist of different organs, which include leaves, stem, reproductive organs, and roots. All the organs play a different role in the plant.
Further ExplanationThe functions of the different organs present in the plant include:
The roots absorb water and inorganic nutrients from the soil. Leaves help by capturing sunlight and provide food for the plants through the process of photosynthesis. Also, the tiny holes in the leaves serve as the exit point for waste products The stem serves as a support for the leaves and flowers and also helps to elevate leaves. The stem also helps in moving water and nutrients through the roots and leaves The plant reproductive organ enables the plant to generate new plantsThe plant consist of many cells and in a tissue, there are cells that work together, particularly similar cells. Also, each of the tissues carries out different functions.
For example, the dermal tissue serves as protection to plant and also monitor the interaction within the plant environment. Dermal tissue also prevents the plants from losing water.
All the organs that a plant possesses allow it to perform the important process of life.
The processes of life are seven, which include
Movement Respiration Senility Growth Reproduction Excretion NutritionLEARN MORE:
A plant root is an example of blank https://brainly.com/question/12031598A plant root is an example of https://brainly.com/question/8971831KEYWORDS:
organplantplant rootprocesses of lifereproductive organDuring the winter months, the groundwater in an area freezes, the rivers freeze, and there is little sunlight available. Which of the following processes would allow plants to survive the winter conditions? A. hibernation B. dormancy C. migration D. pollination
Answer:
The freezing of groundwater and rivers makes water unavailable to plants. To survive the winter where there is little water and little sunlight, many plants become dormant. During dormancy, the plant stops growing. This allows the plant to conserve energy and survive the winter conditions.
Explanation:
Plants return water to the atmosphere through
Transpiration
perspiration
Elimination
precipitation
Will give Brainliest. A ________ is a scientist who studies ancient life, including fossils.
A.geologist
B.cardiologist
C.paleontologist
D.pediatrician
This food chain is incomplete. Two groups of organisms are missing. One group of organisms that is missing are the producers, plants and other photosynthetic organisms. They turn sunlight into chemical energy. What is the other missing group and what do they do? A) Carnivores that eat only meat. B) Herbivores that eat only plants. C) Predators that prey on all other levels of consumers. D) Decomposers that recycle matter back into the food chain.
Im 100% sure The answer is D)
what evidence is there for continental drifft?
The energy driving a windmill each minute equals 2.75 kilojoules. If 1.6 kilojoules of energy is given up by the windmill as thermal energy from friction and electrical resistance how many kilojoules of energy are provided as electricity to the power line?
Answer:
1.15 Kilo-joules are provided as electricity
Explanation:
The law of conservation of energy states that: "Energy can neither be created nor destroyed, but can convert from one form to another".
Applying this on the givens, we would find that:
driving energy = energy provided as electricity + energy lost as heat
2.75 = energy provided as electricity + 1.6
energy provided as electricity = 2.75 - 1.6 = 1/15 kilo-jo
Magnesium is obtained from sea water. Ca(OH)2 is added to sea water to precipitate Mg(OH)2. The precipitate is filtered and reacted with HCl to produce MgCl2. The MgCl2 is electrolyzed to produce Mg and Cl2. If 185 g of magnesium are recovered from 962 g of MgCl2, what is the percent yield for this reaction? Answer in units of percent
Answer:
The percentage yield of magnessium is 19.231 %
Explanation:
The magnesium from sea water is added to Ca(OH)2 to precipitate Mg(OH)2. This magnesium hydroxide is then reacted with HCl as follows ;
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
molar mass of MgCl2 = 24.305 + 35.453 × 2 = 24. 305 + 70.906 = 95.211 g
The equation is balanced now . And 1 mole or 95.11 g of MgCl2 was produced . The magnesium chloride was electrolyzed to produce Mg and Cl2.
The total mass of MgCl2 obtained = 962 grams
mass of the Mg obtained = 185 grams
The percentage yield for the magnesium = 185 / 962 × 100 = 18500/962
The percentage yield for the magnesium = 185 / 962 × 100 = 19.231 %
The percentage yield of magnessium is 19.231 %
Condensation occurs when:
Water is released from plants
Ground water moves to the surface
Surface water change into water vapor
atmospheric water changes into precipitation
What happens when the temperature of an object increases?
A. The object's particles move closer together.
B. The object's particles stop moving.
C. The number of the object's particles increases.
D. The object's Particles move faster.
For the reaction
glutamate- (aq) + oxaloacetate2- (aq) <-> α-ketoglutarate2- (aq) + aspartate- (aq)
the equilibrium constant at standard temperature is Keq′ = 2.82. Suppose the concentrations of glutamate and oxaloacetate were 10 mM and the concentration of α-ketoglutarate was 25 mM when the system was at equilibrium. An additional 25 mM of α-ketoglutarate is added to the solution.
After the α-ketoglutarate is added, when the system has settled down and no net reaction is occurring, what is the value of ΔG' for this reaction?
The value of ΔG' for this reaction can be determined using the equation ΔG' = -RTln(Keq), where R is the gas constant, T is the temperature in Kelvin, and Keq is the equilibrium constant. The addition of α-ketoglutarate will result in a shift in equilibrium to maintain a constant Keq. The new equilibrium concentrations can be calculated using the equilibrium constant expression and algebraic calculations.
Explanation:The value of ΔG' for a reaction can be determined using the equation: ΔG' = -RTln(Keq), where R is the gas constant, T is the temperature in Kelvin, and Keq is the equilibrium constant. Since the system has settled down and no net reaction is occurring, the reaction is at equilibrium. Thus, we can use the given equilibrium constant value (Keq′ = 2.82) to calculate ΔG'.
Initially, the concentrations of glutamate and oxaloacetate are 10 mM each, and the concentration of α-ketoglutarate is 25 mM at equilibrium. When an additional 25 mM of α-ketoglutarate is added, the equilibrium will shift to the left to maintain equilibrium. This means that the concentration of α-ketoglutarate will decrease while the concentrations of glutamate and oxaloacetate increase. However, the equilibrium constant Keq remains the same.
To calculate the new equilibrium concentrations, we can use the equation: Keq = ([α-ketoglutarate][aspartate])/([glutamate][oxaloacetate]). We'll let x represent the change in concentration of α-ketoglutarate. The new concentrations will be: [α-ketoglutarate] = (25 - x) mM, [aspartate] = x mM, [glutamate] = 10 + x mM, [oxaloacetate] = 10 + x mM.
Now, we can substitute these concentrations into the equilibrium constant expression: 2.82 = ((25 - x)x)/((10 + x)(10 + x)).
Using algebra, we can solve for x, which represents the change in α-ketoglutarate concentration. Once we determine the value of x, we can substitute it back into the concentrations to find the new equilibrium concentrations. Finally, we can plug these new equilibrium concentrations back into the equation ΔG' = -RTln(Keq) to calculate the value of ΔG'.
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After the addition of α-ketoglutarate, the Gibbs free energy change (ΔG') for the reaction is calculated to be approximately 1.417 kJ/mol.
To answer this question, we need to calculate the Gibbs free energy change (ΔG') after the addition of α-ketoglutarate using the reaction's equilibrium constant and the concentrations at equilibrium.
We start with the given equilibrium constant: Keq' = 2.82.At equilibrium, the concentrations of glutamate, oxaloacetate, and α-ketoglutarate are provided, and we are adding 25 mM more α-ketoglutarate, making its total concentration 50 mM.Using the reaction quotient (Q) for the adjusted concentrations:Q = [α-ketoglutarate] [aspartate] / [glutamate][oxaloacetate]
Given α-ketoglutarate = 50 mM, glutamate = 10 mM, oxaloacetate = 10 mM, and assuming aspartate = 10 mM at equilibrium:
Q = (50 mM) (10 mM) / (10 mM) (10 mM) = 5
Next, use ΔG' = ΔG°' + RT ln(Q/Keq'):
Given ΔG°' = 0 (since Keq' reflects equilibrium conditions) and RT as the product of gas constant (approximately 2.478 kJ/mol at 298 K):
ΔG' = RT ln (5 / 2.82) = 2.478 kJ/mol x ln (1.773) = 2.478 kJ/mol x 0.572 = 1.417 kJ/mol
Thus, the value of ΔG' after the addition of α-ketoglutarate is approximately 1.417 kJ/mol.