Following are the details of the above mentioned scientific scenario:
Hypothesis: If heavier cart rolls down faster than the lighter cart.Alternative hypothesis: Adding mass to the cart makes the cart roll down faster.Null Hypothesis: Adding mass to the cart does not make the cart roll down faster.Dependent variable: time taken for the carts to roll down the inclined ramp.Independent variable: weights on the cart.Here, she observes how the independent variable, that is the weight on the cart affects the dependent variable, that is, the time taken for the carts to roll down the inclined ramp.Control group: is the cart without any weight on it.Experimental group: is the cart with different amounts of weight on it.Hence, as a result of her experiment, Penny finds the null hypothesis to be true. This is because adding mass to the cart did not change the time it took for it to roll down.
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Which two elements make up this mixture, element C and B element C, and an element D and C or element B And D?
which of these is a risk of consuming a nonrewable resource at a high rate
One of the risks of consuming a nonrenewable resource at a high rate is that the resource could be depleted quickly. Option A.
What are nonrenewable resources?Nonrenewable resources are natural resources that are naturally replenished or are replenished at a much slower pace than they are being consumed.
Nonrenewable resources are unique from renewable resources in that the latter are replenished at a much faster rate than they can ever be consumed.
Examples of nonrenewable resources include mineral deposits, crude oil deposits, etc. Examples of renewable resources include solar energy, wind energy, etc.
Thus, if nonrenewable resources are consumed at a high rate, it greatly increases the risk of depletion quickly.
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The options to pick from are:
A.) The resource could be depleted quickly.
B.) The resource could be consumed very quickly.
C.) The resource could be replenished very slowly.
D.) The resource could be replenished quickly.
acetanilide has a solubility of 1.00 g/185 ml in 25 0c water and 1.00 g/10 ml in 100 0c water. if 250 mg of acetanilide was dissolved in 2.5 ml of water, how much acetanilide would remain in solution when the solution was cooled to 25 0c?
The remaining acetanilide when the solution was cooled to 25°C is 13.513 mg.
What happens in the crystallization process?
The solid compound is dissolved in the solvent at elevated temperatures during the crystallization process, and the crystallized product is obtained by slowly cooling the solution.
Given that,
The solubility of acetanilide at 100°C is 1 g per 10 mL of water. Thus, to dissolve 250 mg of acetanilide at a high temperature, that is 100 °C, we need 2.5 mL of water. At 25°C after the re-crystallization there will be some dissolved acetanilide, which can be calculated as- 185mL of water is needed to dissolve 1g or 1000mg of acetanilide at 25°C. Thus, in 2.5 mL of water, there will be
(2.5×1000)/185 = 13.5135 mg of acetanilide.
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is granola a homogeneous or heterogeneous mixture??
Granola is a heterogeneous mixture.
Heterogeneous mixture is a mixture that does not resemble the uniform mixture and the mixture appears non-uniform.
Granola is a heterogeneous mixture in which Oats, nuts, honey, or other sweetener including brown sugar are commonly incorporated to make granola, that is then typically roasted until it is crunchy, toasted, and golden brown. Periodically, raisins will be added.
Since, different individual could be seen hence it is a heterogeneous mixture.
Hence, Granola is a heterogeneous mixture.
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What intermolecular force or forces govern the solubility of 9-fluorenone in diethyl ether?.
Dipole-induced dipole attraction intermolecular force governs the solubility of 9-fluorenone in diethyl ether.
A dipole-induced dipole attraction is a type of weak attraction as it results when a polar molecule induces a dipole either in an atom or in a non-polar molecule by disturbing the electron arrangement in the particular non-polar species.
Most organic molecules are polar since they have a dipole moment. On behalf of solvents, polarity refers to solvents having higher polarity, and non-polar solvents with lower polarity. Diethyl ether is located at the lower end of the polarity scale and is generally considered a type of 'non-polar' solvent. Therefore, diethyl ether has a small dipole.
As Diethyl ether has a very low polarity value, if any, it is clear that H-bonding is not possible. London dispersion forces are present in all either polar or non-polar molecules, so it is clear that they are present here too. Since it is slightly polar so it may be exhibiting weak dipole-dipole interactions.
Carbon-donated hydrogen bonding is a real thing but they are generally very very weak non-covalent interactions. . London Dispersion Force is present in every chemical system but is weak as well . There are many exceptions where these forces may be significant in the case of binding energies of several dispersion-dominated molecules.
Therefore, the solubility of 9-fluorenone in diethyl ether is governed by dipole-induced dipole attraction or London dispersion forces.
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The particles of a gas inside a balloon are experiencing an increase in their average kinetic energy and the number of collisions with the wall of the balloon. What is the most likely outcome?
The speed limit on a many u.s. highways is 70 miles per hour. convert this speed to kilometers per day.
The speed limit on a many highways is 70 miles per hour. this speed to kilometers per day is 2703.69 km / day.
The speed limit on u.s highways is given as,
speed = 70 miles per hour or 70 mile / h
we have to convert it in kilometers per day,
so,
1 miles = 1.609344 kilometers
and, 1 day = 24 hours
therefore, in 1 hour = 1/ 24 day
applying above values, we get,
70 mile per hour = ( 70 × 1.609344 ) kilometers × 24 / day
70 miles per hour = 112.65408 kilometers × 24 / day
70 miles per hour = 2703.698 kilometers per day
Hence,The speed limit on a many highways is 70 miles per hour. this speed to kilometers per day is 2703.69 km / day.
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A beaker contains a mixture of sand and salt. A student adds water to dissolve the salt. Which processes can be used to separate out the sand and salt?
Filtration and evaporation are used to separate sand and salt mixture.
Separation of salt and sand mixture is as follows :-
The mixture of salt and sand is separated by filtration followed by an evaporation processes.Filtration is used to separate sand from a combination of sand and salt solution Sand is left on the filter paper as a residue after filtering. By boiling the filtrate left on filter paper , common salt may now be produced. Boiling causes all of the water to evaporate, leaving salt behind . This is known as evaporation.In other words, based on the fact that salt is soluble in water, while sand is not. So, you used the difference in solubility to separate a mixture of sand and salt.
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Answer: Filtration to collect the sand and distillation to collect the salt.
Explanation:
How many moles are there in a 3.56g sample of copper (Cu)?
A)1 mole
B)226 moles
C)0.0560 mole
D)17.8 moles
Blue ink from two different pens appears to be the exact same color. Explain how
to determine whether the inks are identical.
A paper ink chromatogram can also be used to detect compounds by comparing them to already identified substances. If two substances create the same number of dots that match in color, they are most likely the same.
The spots travel up the page the same distance (have the same R f value). A paper chromatogram can also be used to detect compounds by comparing them to already identified substances. If two substances create the same number of dots that match in color, they are most likely the same. Thus, ink is a mixture since it is composed of two substances: water (solute) and dye (solvent).
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Which object is a liquid, feels sticky, and is brown in color?(2 points)
Chocolate frosting
Coffee
Soil
Maple syrup
Answer:
Maple Syrup
Explanation:
When 50. 08 g of 1. 00 m naoh at 23 °c is added to 50. 22 g of 1. 00 m hcl at 23 °c, the resulting temperature of the mixture is 29. 7 °c. Is the reaction endothermic or exothermic?.
When 50.08 g of 1.00 M NaOH at 23°C is added to 50.22 g of 1.00 M HCl at 23°C, the resulting temperature of mixture is 29.7°C, then the reaction is exothermic.
An exothermic reaction is a reaction which results in the energy release from a system. Energy is emitted, so there is a decrease in the energy. Thereby, the change in enthalpy is negative.
The amount of heat gained or lost by a sample in a reaction is calculation by using the equation,
q = mcΔT
where,
q = heat energy lost or gained
m = mass of the sample,
c = specific heat
ΔT = change in temperature
Given data :
mass = 50.08 g
c = 4.18 J/gK
ΔT = 29.7°C - 23°C = 6.7 K (we won't change celsius into kelvin as we're calculating the change)
Putting the values,
q = 50.8 x 4.18 x 6.7 = 1422.74 J
We know,
Molality = moles of solute
mass of solute
Moles = molality x mass
= 1.00 M x 50.22 g = 50.22 mol
To calculate change in enthalpy -
ΔH = - 1422.74 J = - 28.33 kJ/mol
50.22 mol
The energy of the product is lower than energy of reactant, it is an exothermic process. Enthalpy change is negative for exothermic reaction.
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Your lab supervisor tells you to heat a chemical until it is 165 degrees* F . What should your thermometer (which measures in C) read when it reaches the correct emperature ?
Answer:
73.8888 repeated
Explanation:
Metals participate in two types of single-displacement reactions. A reactive metal can displace _____ gas either from water or from an aqueous acid. A _____ reactive metal can also displace the ion of a _____ reactive metal from solution.
A reactive metal can displace HYDROGEN gas either from water or from an aqueous acid.
A MORE reactive metal can also displace the ion of a LESS reactive metal from the solution.
A more reactive metal (one that forms positive ions more easily) can displace a less reactive metal from a compound. This is called a displacement reaction. Metal can only displace another metal from a compound if it is located above it in the reactivity series.
As a result, the more reactive metal enters the solution as a cation, whereas the less reactive metal's cations are converted to metal. So more reactive metals displace less reactive metals from their salt solutions.
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. How do molecules move during passive transport?
In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion. A physical space in which there is a different concentration of a single substance is said to have a concentration gradient.
In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion. A physical space in which there is a different concentration of a single substance is said to have a concentration gradient.
. if you are presented with the structure a carbon-containing compound, or trying to draw one yourself, what is the rule about the number of covalent bonds to carbon that are normally found in these structures?
The number of covalent bonds formed by carbon is four.
What kind of bond does carbon form?Covalent bonds are formed between carbon atoms and atoms of other elements or carbon. Carbon compounds come in a wide variety, with atom counts ranging from one to thousands.
Since carbon has four valence electrons, it can create four covalent bonds to reach its full outer energy level. The most stable configuration of electrons is at the maximal outer energy level.
Covalent bonds formed between carbon atoms can be single, double, or triple bonds. One pair of electrons is shared by two carbon atoms to form a single bond. They share two pairs of electrons in a double bond and three pairs in a triple bond.
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suppose 2 pints of a 19% alcohol solution is mixed with 8 pints of a 90% alcohol solution. what is the concentration of alcohol in the new 10-pint mixture
If we suppose 2 pints of a 19% alcohol solution is mixed with 8 pints of a 90% alcohol, then the amount of alcohol is calculated as 92.8%
What is molarity?A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration.
Molarity (M) is the amount of a substance that is present in a certain volume of solution.
Molarity is defined as the moles of a solute per liters of a solution which can further be formulated as:
M= Moles of the solute/ volume of solution.
Herein we have
0.19 (2 pints) + 0.90 (8 pints) = 9.28 pints
So, the concentration is:
9.28 pints / 10 pints × 100% = 92.8%.
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What is the chemical formula for sugar?
Answer:
C12H22O11
Explanation:
what is the name for NaCl?
Answer: Sodium Chloride
Explanation:
Na= sodium Cl= Chloride
Answer
is Nacl
Explanation:
NacI
13. In a science experiment, the
manipulated or changed.
dependent
stipulated
independent
none of the above
variable is the one that is
Answer:
In a science experiment, the
manipulated or changed.
= Independent variable
I HOPE IT HELP YOU
Which is an example of poor safety practices when working outdoors?
O A. Cleaning up your trash
B. Wearing gloves when working with soil
C. Wearing a helmet in dangerous areas
OD. Eating a plant to test it
Answer:
A poor safety practice would be to eat a plant to test it.
Explanation:
D. Eating a plant to test it.
→ You shouldn’t eat a random plant without knowing what it is or without washing it.
hopefully this helps you ^^
Answer:
D. Eating a plant to test it
Explanation:
Cleaning up, wearing gloves and a helmet are safe when working outdoors. Eating certain plants can be harmful, especially if you're not familiar with it.
One type of neon has 10 neutrons, while other types have 11 neutrons and 12 neutrons. which term best defines the different types of neon atoms in nature?
One type of neon has 10 neutrons, while other types have 11 neutrons and 12 neutrons. The term best defines the different types of neon atoms in nature is known as Isotopes.
Isotopes are atoms of the similar element that have indifferent numbers of neutrons but the equal number of proton and electrons.
The different in the neutrons results the same element with different masses.
Neon is a chemical element. Its symbol is denoted by Ne.
It is called as Nobel gas and the most stable element.
If talking about the properties it is odorless , uncolored, monoatomic, chemically inactive.
Also called as inert gas.
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Answer: isotopes
Explanation:
i took the test
At the end of an enzymatic reaction, what will the concentrations of the substrate, product, and enzyme be relative to the start of the reaction?.
At the end of an enzymatic reaction there remains a product and the unaltered enzyme.
What happens when the substrate concentration in an enzymatic reaction is increased?Concentration of Substrate: To a point, increasing the substrate concentration also increases the rate of reaction. Any increase in substrate will have no effect on the rate of reaction once all of the enzymes have bound, because the available enzymes will be saturated and working at their maximum rate.The products of the reaction are released from the active site and diffuse away after the reaction occurs." by OpenStax College, Biology, CC BY 3.0. We know that when an enzyme binds to its substrate, it lowers the activation energy of the reaction, allowing it to happen faster.One of the most important properties of enzymes is that the reactions they catalyse leave them essentially unchanged. After catalysing a reaction, an enzyme releases its products (substrates).This means that as the enzyme concentration decreases, so will the reaction rate. In most biological environments, the enzyme concentration is lower than the substrate concentration. The proportionality between enzyme concentration and enzyme activity is direct.To learn more about enzymatic reaction refer to
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Sodium phosphate reacts with sulfuric acid to form sodium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?.
When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.
In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.
The chemical equation for the given reaction is:
[tex]Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Put the necessary stoichiometric coefficient to balance each element.
Balancing Na:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Balancing P:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Balancing S:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Notice that H and O are already balanced.
Hence, the balanced chemical equation for the reaction is:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
where 3 is the stoichiometric coefficient of sulfuric acid, [tex]H_{2} SO_{4}[/tex].
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calculate the molar concentration of a 3.0% mass percent concentration of h2o2. you can assume the density of the solution is 1.00 g/ml. (hint: start with 1.00 kg of solution)
The molar concentration of 3.0% mass percent concentration of H₂O₂ is 0.88 MOL/L
Explanation:
From the given problem:
Concentration of H₂O₂ = 3.0%
Volume = 1.00 ml
Density of solution = 1.00 g/ml
Here it is given that, In 3.0% H₂O₂ , the solution contain 30g H₂O₂ per 1000g of solution.
To find the molecular weight of H₂O₂, we have to do this calculation to get the molecular weight of H₂O₂= 2(mass of hydrogen) + 2(mass of oxygen) = 2×1 + 2×16
Since the molecular weight of H₂O₂ =34 g/MOL.
then 30g would be (Mass/ MOL. wt)
= (30g)/(34g/MOL.)
=0.88 MOL.
So the solution would be 0.88 MOL/L
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Which of the following is NOT part of Dalton's Atomic Theory?
1. Atoms are composed of tiny subatomic particles.
2. Atoms that combine do so in simple, whole-number ratios.
3. All elements are composed of atoms.
4. Atoms of the same element are identical.
Answer: The statement that theatoms are made up of protons, neutrons, and electrons is not a part of Dalton's atomic theory. Therefore, option c is correct.
Explanation:
What does the term “combining capacity” mean?
Answer:
Its valency
The number of valence electrons of an atom gives us an idea of the combining capacity. The number of valence electrons of an atom gives us an idea of the combining capacity.
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Have a great day and God bless! :)
5. Determine how the Sun can continue to heat the atmosphere at night. SC.6.E.7.5
Some terminator atmosphere streams over the horizon, and there may be a trace of warmth from sunlight reflected off the lunar surface.
What is the atmosphere?
The layer of gases held by Earth's gravity that surrounds the planet and constitutes its planetary atmosphere is known as the atmosphere or air. The Earth's atmosphere supports life by producing pressure on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and decreasing temperature extremes between day and night.
Some terminator atmosphere streams over the horizon, and there may be a trace of warmth from sunlight reflected off the lunar surface. However, the sun does not, in general, warm the environment at night. As a result, the atmosphere tends to cool during the night, reaching its coldest point right before morning.
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A cube of gold-colored metal with a volume of 54 cm3 has a mass of 980 g. The density
of gold is 19.3 g/cm3. Is this sample of metal pure gold?
Answer:
A gold-colored metal with a volume of 59 cm3 and a mass of 980 g will have a density of 16.61 g/cm3 instead of 19.3 g/cm3
Recall that the density of a substance is the ratio of its mass and that of its volume.
In other words; density = mass/volume
In this case, the mass of the gold-colored metal is 980 g while the volume is 59 cm3
density of the metal = 980/59
= 16.61 g/cm3
Thus, the density of the gold-colored metal is 16.61 g/cm3, instead of 19.3 g/cm3
Explanation:
using the results of our calculations in class (you do not need to rederive these relationships, just use them!), what is the maximum radius of an atom that will just fit into a octahedral hole site in fcc ni without distorting the structure?.... the octahedral hole site of bcc fe
The radius of the atom that just fits into the octahedral site is 0.414 times the radius of Fe.
What is the radius ratio rule?The ratio of a cation's lower ionic radius to its greater ionic radius (anion) is known as the radius ratio.
What is the importance of this rule?This rule aids in figuring out how ions are arranged in distinct crystal formations. It aids in determining an ionic crystal structure's stability.
According to the limiting radius ratio,
= 0.414
R = radius of an atom
r = radius of Fe
Hence, the radius of the atom that just fits into the octahedral site, R = 0.414 ×r
R= 0.414 times radius of Fe(r)
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