Answer:
Explanation:
Mechanical digestion involves physically breaking down food substances into smaller particles to more efficiently undergo chemical digestion. The role of chemical digestion is to further degrade the molecular structure of the ingested compounds by digestive enzymes into a form that is absorbable into the bloodstream.
I need help it’s due in a couple minutes !
Answer:
chemical composition
The Mississippi River carries tons of tiny rock fragments called sediments into the Gulf of Mexico. What do you think will happen to these sediments after a few million years?
Answer:build up
Explanation:
Answer:
The sediments will be transformed into rock.
Explanation:
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Calculate the mass of magnesium necessary to evolve 80 mL of H2 at STP. Then weigh approximately this quantity of Mg ribbon on the top-loading balance to the nearest mg(±0.001 g)
We need approximately 0.0869 g of magnesium to evolve 80 mL of H₂ gas at STP. We should weigh approximately this quantity of Mg ribbon on the top-loading balance to the nearest mg (±0.001 g).
To evolve 80 mL of H₂ gas at STP, we need to calculate the mass of magnesium required, and then weigh approximately that quantity of Mg ribbon to the nearest mg (±0.001 g).
To calculate the mass of magnesium required to evolve 80 mL of H₂ gas at STP, we can use the balanced chemical equation for the reaction between magnesium and hydrochloric acid:
Mg + 2HCl → MgCl₂ + H₂
According to the equation, one mole of magnesium reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas. At STP, one mole of gas occupies 22.4 L of volume. Therefore, the number of moles of H₂ gas produced can be calculated as follows:
n = V/22.4 = 0.080 L/22.4 L/mol = 0.00357 mol
Since the stoichiometry of the reaction is 1:1 for magnesium and hydrogen, the number of moles of magnesium required is also 0.00357 mol.
The molar mass of magnesium is 24.31 g/mol. Therefore, the mass of magnesium required can be calculated as follows:
mass = n x M = 0.00357 mol x 24.31 g/mol = 0.0869 g
Therefore, we need approximately 0.0869 g of magnesium to evolve 80 mL of H₂ gas at STP. We should weigh approximately this quantity of Mg ribbon on the top-loading balance to the nearest mg (±0.001 g).
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Select the boxes to identify the net force for each stage of the car motion
The boxes to identify net force for each stage of the car motion is at rest: A, begins to move forward: H, moves at a constant speed: k, slows down: S.
What is net force? The definition of a net force is the total force acting on an item in a single plane. Because it may be used to calculate acceleration, net force is significant because it aids in describing the motion of the item. Unless acted upon by an imbalanced net force, an object in motion will remain in motion, and an object at rest will remain at rest, according to Newton's first law of motion. Therefore, it is possible to forecast an object's motion by knowing the net force acting on it.In general, negative forces are those that move downward or backward, and positive forces are those that move upward or forward. These forces add up to equal the net force.For more information on net force kindly visit to
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Jessica poured a liquid into the graduated cylinder below. What is the volume of the liquid?
Answer:
Answer is B
Explanation:
Ozzie wanted to do another experiment with a stronger H2O2 solution to check the accuracy of the experiment by calculating the theoretical volume of O2(g) it would produce. Then he could compare his experimental volume of O2(g) to the theoretical volume of O2(g). He used 7.40 mL of 3.53 M H2O2 and the partial pressure of O2 was 0.9604 atm and the temperature was 294.05 K. What volume of O2(g) could he theoretically produce (in mL)
The theoretical volume of oxygen produced is 0.934 mL. Therefore, the volume of \(O_2\)(g) that Ozzie could theoretically produce is 0.934 mL.
The chemical equation for the decomposition of hydrogen peroxide is
\(2H_2O_2(l)-> 2H_2O(l) + O_2(g)\)
A mole ratio of 1:1 exists between the volume of oxygen produced and the volume of hydrogen peroxide decomposed. This is expressed in terms of Avogadro's principle: 1 mole of a gas occupies 24.5 L at standard temperature and pressure (STP).
When a solution of hydrogen peroxide is decomposed, the volume of oxygen gas produced can be calculated using the ideal gas law as given below :PV = nRT
Where,P = pressure of the gas (atm)V = volume of the gas (L)n = number of moles of the gasR = ideal gas constant = 0.0821 L atm/(mol K)T = temperature of the gas (K)
Number of moles of \(O_2\) produced can be calculated as follows:
0.9604 atm (V) = n (0.0821 L atm/mol K) (294.05 K)n = 0.0381 mol .
As given earlier, the mole ratio of \(H_2O_2\) to\(O_2\) is 1:1, i.e.,0.0381 mol \(O_2\)= 0.0381 mol \(H_2O_2\)Volume of \(H_2O_2\) used = 7.40 mL = 0.00740 L . Concentration of\(H_2O_2\)used = 3.53 M .
Molar mass of\(H_2O_2\)= 34 g/molTherefore, number of moles of\(H_2O_2\) used = 0.00740 L × 3.53 mol/L = 0.0261 molVolume of O2 produced can be calculated as follows:0.0381 mol \(O_2\) × 24.5 L/mol = 0.934 mL .
The theoretical volume of oxygen produced is 0.934 mL. Therefore, the volume of \(O_2\)(g) that Ozzie could theoretically produce is 0.934 mL.
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who invented aeroplanes please tellme
Answer:
The Brazilian Santos Dumont
Explanation:
Santos Dumont created the 14 Bis airplane, the first airplane to perform a flight through 200 meters im Paris, France, in 23 October 1906
Orville and Wilbur Wright were the first two to actually invent the aeroplane. These American brothers also designed and flew their first creation after making it in their bicycle shop in December 17, 1903.
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How can an object enter Earth's orbit?
Sulfur is in the same column of the periodic table as oxygen but it is less electronegative than oxygen. Compared to water molecules, how will the h2s molecules behave?.
Sulfur (S) and oxygen (O) are both elements in Group 16 (formerly Group VI A) of the periodic table. This group is often referred to as the oxygen group or chalcogens. Oxygen is highly electronegative, meaning it has a strong tendency to attract electrons towards itself when it forms chemical bonds.
Water molecules are highly polar due to the significant electronegativity difference between oxygen and hydrogen. The oxygen atom in water pulls electrons towards itself, creating a partial negative charge (δ-) on the oxygen and partial positive charges (δ+) on the hydrogen atoms. This polarity allows water molecules to form hydrogen bonds with each other, resulting in strong intermolecular forces.
The stronger intermolecular forces in water due to hydrogen bonding result in higher boiling and melting points compared to hydrogen sulfide. Water is a universal solvent due to its high polarity and ability to form hydrogen bonds. Many substances dissolve well in water. Hydrogen sulfide, although less polar and with weaker intermolecular forces, is still somewhat soluble in water, resulting in a weak acid known as hydrosulfuric acid.
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The beta decay of cesium-137 has a half-life of 30.0 years. How many years must pass to reduce a 25.0 mg sample of cesium-137 to 9.38 mg?
Answer:
t = 42.4 years
Explanation:
To find the amount of time needed for the sample to decay, you need to use the half-life equation:
\(N(t) = N_0(\frac{1}{2})^{t/h}\)
In this equation,
-----> N(t) = final mass (mg)
-----> N₀ = initial mass (mg)
-----> t = time passed (yrs)
-----> h = half-life (yrs)
You can find how much time passed by plugging the given variables into the equation and solving for "t". The final answer should have 3 sig figs like the given values.
N(t) = 9.38 mg t = ? yrs
N₀ = 25.0 mg h = 30.0 yrs
\(N(t) = N_0(\frac{1}{2})^{t/h}\) <----- Half-life equation
\(9.38mg = 25.0mg(\frac{1}{2})^{t/30.0yrs}\) <----- Insert variables
\(0.3752 = (\frac{1}{2})^{t/30.0yrs}\) <----- Divide both sides by 25.0 mg
\(ln(0.3752) = ln((\frac{1}{2})^{t/30.0yrs})\) <----- Take the natural log of both sides
\(ln(0.3752) = \frac{t}{30.0yrs} ln(\frac{1}{2})\) <----- Rearrange the exponent
\(-9.803 = \frac{t}{30.0yrs} (-0.6931)\) <----- Solve the natural logs
\(1.1414= \frac{t}{30.0yrs}\) <----- Divide both sides by -0.6931
\(42.4 yrs= t\) <----- Multiply both sides by 30.0 yrs
Assuming a density of 1.00 g/ml what is the total mass of the solution (water) in the calorimeter?
If we assume the density of water is 1.00 g/mL, the mass of water is 250 g
To find mass here density is given so we use density formula density=mass/volume
The volume of water is given but not the mass. Hence volume is converted into mass by using the density of water, which 1.0 g /ml. Therefore, Mass of water = 250 ml x 1.0 g/ml = 250 g
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a patient is receiving procalamine postoperatively at 125 ml/h. procalamine contains 3% final concentration of glycerin (4.3 kcal/gm) and 3% final concentration of amino acid. how many grams of protein are provided per day by this solution?
The procalamine solution provides approximately 74.7 grams of protein per day.
To decide the quantity of grams of protein gave by the procalamine arrangement, we really want to know the complete number of kilocalories (kcal) given by the arrangement each day and the extent of kcal that come from protein.
How much glycerin in the arrangement is 3% or 0.03. The kcal given by the glycerin can be determined as:
125 ml/h x 24 h/day = 3000 ml/day
3000 ml/day x 0.03 = 90 g/day
90 g/day x 4.3 kcal/gm = 387 kcal/day
Additionally, how much amino corrosive in the arrangement is 3%. The kcal given by the amino corrosive can be determined as:
125 ml/h x 24 h/day = 3000 ml/day
3000 ml/day x 0.03 = 90 g/day
90 g/day x 4 kcal/gm = 360 kcal/day
The absolute kcal given by the arrangement each day is:
387 kcal/day + 360 kcal/day = 747 kcal/day
Accepting that 10% of the complete kcal given by the arrangement come from protein, the quantity of grams of protein given by the arrangement each day is:
747 kcal/day x 0.10 = 74.7 g/day
Thusly, the procalamine arrangement gives roughly 74.7 grams of protein each day.
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At standard temperature and pressure, 0. 500 mole of xenon gas occupies
At standard temperature and pressure (STP), which is defined as 0 degrees Celsius (273.15 Kelvin) and 1 atmosphere of pressure, 1 mole of any ideal gas occupies a volume of 22.4 liters.
Therefore, for 0.500 mole of xenon gas at STP, the volume occupied would be:
Volume = (0.500 mole) x (22.4 liters/mole)
Volume = 11.2 liters.
Xenon is used in certain specialised light sources. It produces a beautiful blue glow when excited by an electrical discharge. Xenon lamps have applications as high-speed electronic flash bulbs used by photographers, sunbed lamps and bactericidal lamps used in food preparation and processing.
So, 0.500 mole of xenon gas would occupy 11.2 liters of volume at STP.
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what is the net ionic equation for the precipitation reaction between silver nitrate solution and sodium sulfide solution
2Ag[+](aq) + S[2-] -> Ag{2}S(s) is the net ionic equation for the precipitation reaction between silver nitrate solution and sodium sulfide solution.
What is ionic equation?An ionic equation is a chemical equation in which the electrolytes in aqueous solution are expressed as dissociated ions. It is similar to a molecular equation in which compounds are expressed as molecules. Chemical equations known as ionic equations only display the ions involved in a chemical reaction. Or, the ions that combine in a solution to react and create new substances. Those ions that don't take part are referred to as spectator ions. A chemical equation known as an ionic equation expresses the electrolytes in aqueous solution as dissociated ions. The ionic species are usually followed by (aq) in the equation to denote that they are in an aqueous solution, and this is typically a salt that has been dissolved in water.
Here,
The precipitation reaction between silver nitrate solution and sodium sulfide solution is represented by the net ionic equation 2Ag[+](aq) + S[2-] -> Ag{2}S(s).
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What factors determine the amount of energy stored in a gummy bear, and how do they affect the amount of energy stored?
Some ideas to get you started: Type of bond, number of bonds, etc
Answer:i don’t know
Explanation:i don’t know
A projectile is projected with an initial velocity of 40 m/s at a 45o angle to the horizontal. , calculate the total time travelled.
Answer:
5.77 s
Explanation:
From the question,
The total time travelled by the projectile = Time of flight (T)
T = 2usinθ/g............ Equation 1
Where T = Time of Flight of the projectile, u = Initial velocity, θ = Angle of projection to the horizontal, g = acceleration due to gravity
Given: u = 40 m/s, θ = 45°
Constant: g = 9.8 m/s²
Substitute these values into equation 1
T = 2(40)sin(45°)/9.8
T = 80sin(45°)/9.8
T = 80×0.7071/9.8
T = 5.77 s
Describe the benefits of using nanoparticles instead of other, larger technology.
Answer:
it has a huge surface-to-volume ratio, very high porosity and completely different physiochemical properties.
Explanation:
idk if the answer is good !
sorry
Describe the evidence of a chemical change when burning a piece of paper
Answer: So the burning of paper is considered as a chemical change as the paper after burning changes into ashes and fumes of gases evolve.
Explanation:
How are incomplete and complete metamorphoses the same?
Insects that go through these cycles form a cocoon.
Insects that go through these cycles start as an egg.
The infant insects that go through these cycles look different from the adult.
The insects that go through these cycles reproduce by laying unfertilized eggs.
Incomplete and complete metamorphoses are similar in that they both start as an egg and the infant insects that go through these cycles look different from the adult. Options 2 and 3.
Complete and incomplete metamorphosisIn both types of metamorphoses, the insect starts as an egg and hatches into a larva or nymph. The larva or nymph of both types of metamorphoses looks different from the adult, and they both go through multiple developmental stages before reaching adulthood.
However, incomplete and complete metamorphoses differ in several ways:
insects that go through incomplete metamorphosis do not form a cocoon, and the developmental changes between the larval stage and the adult are gradual, with the immature stages resembling the adult.insects that undergo complete metamorphosis form a cocoon or pupa, and the developmental changes between the immature and adult stages are more drastic, with the immature stages looking very different from the adult.insects that go through incomplete metamorphosis lay fertilized eggs, while those that go through complete metamorphosis reproduce by laying unfertilized eggs.More on complete and incomplete metamorphosis can be found here: https://brainly.com/question/29061320
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Which best describes the difference between physical and chemical changes?
Physical changes only change the size or shape, but chemical changes change the molecular structure and create a new substance.
Physical are always visible changes and chemical changes are never visible.
Chemical changes only change the size or shape, but physical changes change the molecular structure and create a new substance
Chemical are always visible changes and Physical changes are never visible.
Answer:
Physical changes only change the size or shape, but chemical changes change the molecular structure and create a new substance.
Explanation:
The first option provides are more fitting and succinct definition and shows the difference between physical and chemical changes.
In addition; a physical change is one that alters the physical properties of matter particularly the form and state. In many cases, the change is easily reversible
A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes. This process is not easily reversible. Examples are combustion and rusting of iron.
(science) explain the difffrence between a food chain and a food web
Answer: A food chain shows what eats what. A food web is made up of all the food chains in the ecosystems.
Explanation: Hope that helps!
Answer:
Explanation:
A food chain outlines who eats whom.
A food web is all of the food chains in an ecosystem.
Need help pleaseeeeeeeeee help me
Answer:
and I quenot se the question
Explanation:
ok firts you dirent take a god picture
The more mass you have of a substance:
A. the greater its thermal energy
B. the slower the motion of its particles
C. the smaller its thermal energy
D. the faster the motion of its particles
At 100°C, Kp = 60.6 for the reaction2NOBr(g) ⇄ 2NO(g) + Br₂(g) In a given experiment, 0.10 atm of each component is placed in a container. Is the system at equilibrium? If not, in which direction will the reaction proceed?
The system is not at equilibrium.
The reaction will proceed to the right to attain the equilibrium.
Let's consider the following reaction.
2 NOBr(g) ⇌ 2 NO(g) + Br₂(g)
The pressure equilibrium constant (Kp) is 60.6. To determine if the system is at equilibrium when the pressure of each component is 1.75 atm, we have to calculate the reaction quotient (Q) and compare it with Kp.
Q = [NO]².[Br₂] / [NOBr]²
Q = (1.75)².(1.75) / (1.75)²
Q = 1.75
Since Q ≠ Kp, the system is not at equilibrium.
Since Q < Kp, the reaction will proceed to the right to attain the equilibrium.
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a sample of radioactive isotope is found to have an activity of 114 bq imediately after it is pulled from the reactor that formed the isotope. its activity 3 h, 50 min later is measured to be 80.2 bq. find the decay constant
The decay constant for the radioactive isotope in this problem is approximately 0.069\(h^-^1\).
The activity of a radioactive isotope is the rate at which it decays, and is measured in becquerels (Bq). The activity of a sample of radioactive material decreases over time as the number of radioactive nuclei in the sample decreases due to radioactive decay.
The rate of radioactive decay is described by the first-order rate law, which relates the rate of decay to the number of radioactive nuclei present in the sample. The rate constant (λ) for radioactive decay is a characteristic property of the isotope and is related to its half-life (t1/2) by the equation:
t1/2 = ln(2)/λ
where ln(2) is the natural logarithm of 2, which is approximately 0.693.
To find the decay constant for the radioactive isotope in the given problem, we can use the following equation:
A = A0 e^(-λt)
where A is the activity at time t, A0 is the initial activity, and t is the time elapsed since the initial measurement.
Substituting the given values into this equation, we get:
80.2 Bq = 114 Bq e^(-λ(3 h 50 min))
Converting the time elapsed to hours, we get:
t = 3.833 h
Substituting this value, we get:
80.2 Bq = 114 Bq e^(-λ(3.833 h))
Dividing both sides by 114 Bq, we get:
0.704 = e^(-λ(3.833 h))
Taking the natural logarithm of both sides, we get:
ln(0.704) = -λ(3.833 h)
Solving for λ, we get:
λ = -ln(0.704)/3.833 h
λ ≈ 0.069 h^-1
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What is the mass of an object with a density of 5.7 g/cm^3 and a volume of 48
cm^3? *
Answer:
273.6 g
Explanation:
mass =(density)(volume)
mass=(5.7g/cm^3 )(48 cm^3)
cancel out your cm^3 and your are left with grams
multiply (5.7g)(48)=273.6 g
The mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.
What is density?Density is defined as the degree to which a material is packed together.
It is also defined as a mass per unit volume of the substance.
Its SI unit is kilogram per cubic meter or gram per meter.
Density can be expressed as
Density = mass / volume
Mass = density x volume
As given, Density = 5.7 g/cm³
Volume = 48 cm³
So, Mass = 5.7 g/cm³ x 48 cm³
= 273.6 grams
Thus, the mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.
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Câu 7. Hòa tan hết 3,28g hỗn hợp X gồm Mg và Cu cần dùng 28ml dung dịch HNO3 aM(đặc, nóng) thì thu được 3,136 lit khí X (sản phẩm khử duy nhất, đkc). a. Viết phương trình phản ứng b. Tính % khối lượng từng kim loại (21,95%; 78,05%) c. Tính nồng độ mol/lít dung dịch HNO3 đã dùng (5M) d. Tính khối lượng muối có trong dung dịch
Answer:
I don't understand any single word☹️☹️☹️
can I calculate cube root of (37.0) without using calculator
ye
Explanation:
yes of course you can
2. A copper wire can conduct electricity whether the wire is
very thin or very thick. Is electrical conductivity an
extensive property or an intensive property?
Answer:
Intensive
Explanation:
The electrical conductivity of a wire depends on its composition, not the length of the wire.
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As copper wire was very thin, it will have great electrical conductance and copper wire has a intensive property.
What is electrical resistance of wire and how copper wire has intensive property?The electrical resistance of a wire is given by
R = ρl/A.
where,
R -Resistivity of the material,
l - length of the wire,
A - cross-sectional area of the wire
As we know the formula, it can be explained as:
The resistance is proportional to the length of the wire.The resistance is inversely proportional to the cross-sectional area. If the resistance is less then it means that it has the cross - sectional will be large and if the resistance is higher then the cross - sectional area will be small.Thick wires has larger cross sectional area and thin wires has small cross sectional area.Hence, we came to know that, thin wires have a greater electrical resistance than a thick wire.
So, copper wire was very thin and it can conduct electricity.
An intensive property is a property of matter that depends on the type of matter of the sample not considered by the amount of matter. Other intensive properties include color, temperature, density, and solubility.Here, concluded that copper wire was very thin and it has intensive property.
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m%of solution containing 100 gram of NaCl dissolved in 500g of water
Answer:
16.7 %(m/m)
Explanation:
The percent by mass of a solution (% m/m) is defined as 100 times the ratio of the mass of solute (The substance in the lower amount, NaCl) and the mass of the solution = Mass solute + Mass Solvent (water).
Mass Solution:
100g NaCl + 500g water = 600g solution
Mass Percent:
100g NaCl / 600g solution * 100
= 16.7 %(m/m)