Which of these is NOT an example of one or more forces acting on an object? A. an apple decaying B. an apple falling from an apple tree C. an apple staying at rest on the ground D. an apple hanging from an apple tree branch

Answer:

SI unit for number of representative particle is MOLE.

Explanation:

The SI unit used to measure the number of representative particles in a substance is the mole. One mole of a substance contains Avogadro's number, or 6.02×10²³ particles. This concept is critical in chemistry calculations.

The SI (International System) unit used to measure the number of representative particles in a substance is the mole (abbreviated mol). A mole is a convenient amount unit for expressing very large numbers of atoms or molecules. Experimental measurements have determined the number of entities composing 1 mole of a substance to be 6.022 x 10²³ , a quantity called Avogadro's number.

The mole is a versatile unit that conveniently uses scientific notation to represent large values. One mole always contains 6.02×10²³  particles, independent of the element substance. This number is also known as Avogadro’s number (NA).

A mole of any substance has a mass in grams equal to its molecular mass, which can be calculated from the atomic masses given in the periodic table of elements. These concepts help scientists do computations ranging from simple unit conversions to more complex, multi-step calculations.

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Answer:

256.52 g/m

Explanation:

Each S has a molecular mass of 32.056 g/mol so multiply that by 8 and you get 256.52.

Here is the solution hope u understand

The empirical formula mass of the compound is calculated to be 97 g. Thus, molecular formula of compound is C₈H₁₀O₂N₄.

Empirical formula of a compound is derived from the mole ratio of each element in the compound. The molecular formula of the compound can be obtained by multiplying the empirical  formula with the integer calculated by dividing the molecular mass by formula mass.

Given 49.48 % of C means 49.48 g in 100 g = 49.48/12= 4.12 moles

mass of oxygen = 16 g/mol

moles in 16.48 g = 16.48.=/ 16 = 1.03 moles.

mass of H = 1 g/mol, moles in 5.19 = 5.19 moles.

mass of nitrogen = 14 g/mol, moles in 28.85 g = 28.85/14 = 2.06 moles.

Divide each numbers with the least number among them that is by 1.03, we get the ratios 4: 5: 1: 2. for C, H, O and N respectively.

The empirical formula mass = (4 × 12) + 5 + 16 +( 14×2 ) = 97 g

divide the molecular mass  by 97: 194.19 /97 = 2.

Now, multiply the empirical molar ratio by 2 we get 8: 10 : 2:4.

Therefore, the molecular formula of the compound is C₈H₁₀O₂N₄.

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Answer:

2.88 L.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant.

T is the temperature of the gas in K.

P₁V₁ = P₂V₂

P₁ = 1.0 atm, V₁ = 7.2 L.

P₂ = 2.5 atm, V₂ = ??? L.

∴ V₂ = P₁V₁/P₂ = (1.0 atm)(7.2 L)/(2.5 atm) = 2.88 L.

Answer:

5,170 J.

Explanation:

Q = m.c.ΔT.

where, Q is the amount of heat released from the calorimeter (Q = ??? J),

m is the mass of the calorimeter (m = 1.4 kg = 1400.0 g),

c is the specific heat capacity of the calorimeter (c = 3.52 J/g °C),

ΔT is the temperature difference (final T - initial T) (ΔT = 27.45 - 28.50 = - 1.05°C).

∵ Q = m.c.ΔT.

∴ Q = m.c.ΔT = (1400.0 g)(3.52 J/g °C)(- 1.05°C) = - 5174.0 J ≅ - 5,170 J.

∴  The amount of heat absorbed by the reaction = 5,170 J.

Answer:

When 40.0 mL of 1.00 M H2SO4 is added to 80.0 mL of 1.00 M NaOH at 20.00°C in a coffee cup calorimeter, the temperature of the aqueous solution increases to 29.20°C. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and solution is 4.184 J/g • °C, how much heat is given off in the reaction? (Ignore the mass of the calorimeter in the calculation.)

Use q equals m C subscript p Delta T..

4.62 kJ

10.0 kJ

14.7 kJ

38.5 kJExplanation:

Answer:

cation.

Explanation:

Explanation:

Radiation is defined as an electromagnetic energy which travels in space in the form of waves or particles.

An alpha particles is basically a helium nucleus and it contains 2 protons and 2 neutrons.

Symbol of an alpha particle is [tex]^{4}_{2}\alpha[/tex].

A beta particle is a particle with a negatively charged electron. Symbol of a beta particle is [tex]^{0}_{-1}\beta[/tex].

A gamma particle is basically a photon of electromagnetic radiation with a short wavelength.

Symbol of a gamma particle is [tex]^{0}_{0}\gamma[/tex].

Therefore, we can conclude that the definition of radiation and the different types of radioactive emissions are as follows.

" Radiation is the process of emitting radiant energy in the form of waves or particles. An alpha particle is two protons and two neutrons bound together into a particle identical to a helium nucleus. A beta particle is a negatively charged electron emitted by the nucleus. A gamma ray is the radioactive decay of an atom that releases a photon, which results from a redistribution of electric charge within a nucleus.

Radiation is a broad term that refers to the emission of energy in the form of electromagnetic waves or subatomic particles. This energy is released by atoms that are unstable, known as radioactive atoms. The process of radiation can take several forms, each with its own characteristics:

- Alpha particle: This is a type of radioactive emission that consists of two protons and two neutrons. It is the largest and most energetic of the common emissions, but because of its size, it can be stopped by a few centimeters of air or a piece of paper. Alpha particles are essentially the nucleus of a helium atom, hence why they are identical to a helium nucleus.

- Beta particle: This emission is a high-energy electron that is ejected from the nucleus of an atom during certain types of radioactive decay. Beta particles are more penetrating than alpha particles and can travel through several meters of air or a few millimeters of aluminum.

- Gamma ray: Gamma rays are high-energy photons, which are packets of electromagnetic energy. They are emitted from a nucleus during radioactive decay and are the most penetrating of the common radioactive emissions. Gamma rays can travel through several centimeters of lead or several meters of concrete, making them difficult to shield against.

Each of these types of emissions is a form of ionizing radiation, meaning they have enough energy to remove tightly bound electrons from atoms, creating ions. This can lead to damage in living tissue, which is why radiation can be harmful to biological organisms. The definitions provided in the question help to distinguish between the different types of radioactive emissions and their properties."

no it doesn't make differance at all ...only the material used make difference

Answer:

- 0.0413°C ≅ - 0.041°C (nearest thousands).

Explanation:

ΔTf = Kf.m,

Where,

ΔTf is the change in the freezing point.

Kf is the freezing point depression constant (Kf = 1.86 °C/m).

m is the molality of the solution.

Molality is the no. of moles of solute per kg of the solution.

∴ molality (m) = no. of moles of solute/kg of solvent = (0.04685 mol)/(2.11 kg) = 0.0222 m.

∴ ΔTf = Kf.m = (1.86 °C/m)(0.0222 m) = 0.0413°C.

∴ The freezing point of the solution = the freezing point of water - ΔTf = 0.0°C - 0.0413°C = - 0.0413°C ≅ - 0.041°C (nearest thousands).

Answer:

-0.041

Explanation:

Answer:

acidic

neutral

basic

Explanation:

Answer:

The answer and the explanation given below:

Explanation:

The pH is a scale which is used to identify a solution whether it is acidic, basic or neutral. The pH scale ranges from 0 to 14. A pH 7.0 is neutral which is of pure water. The range from 0.0 to 6.9 is acidic due to presence of a high concentration of hydrogen ions (H⁺) in the solution as compared to pure water. The range 7.1 to 14.0 is basic due to presence of a low concentration of hydrogen ions (H⁺) in the solution as compared to pure water.

Answer:

[tex]\Delta H\textdegree = -2856.8\;\text{kJ}[/tex] per mole reaction.

[tex]\Delta H\textdegree = -22.3\;\text{kJ}[/tex] per mole reaction.

Explanation:

What is the standard enthalpy of formation [tex]\Delta H_f\textdegree{}[/tex] of a substance? [tex]\Delta H_f\textdegree{}[/tex] the enthalpy change when one mole of the substance is formed from the most stable allotrope of its elements under standard conditions.

Naturally, [tex]\Delta H_f\textdegree{} = 0[/tex] for the most stable allotrope of each element under standard conditions. For example, oxygen [tex]\text{O}_2[/tex] (not ozone [tex]\text{O}_3[/tex]) is the most stable allotrope of oxygen. Also, under STP [tex]\text{O}_2[/tex]  is a gas. Forming [tex]\text{O}_2\;(g)[/tex] from itself does not involve any chemical or physical change. As a result, [tex]\Delta H_f\textdegree{} = 0[/tex] for [tex]\text{O}_2\;(g)[/tex].

Look up standard enthalpy of formation [tex]\Delta H_f\textdegree{}[/tex] data for the rest of the species. In case one or more values are not available from your school, here are the published ones. Note the state symbols of the compounds (water/steam [tex]\text{H}_2\text{O}[/tex] in particular) and the sign of the enthalpy changes.

How to calculate the enthalpy change of a reaction [tex]\Delta H_\text{rxn}[/tex] (or simply [tex]\Delta H[/tex] from enthalpies of formation?

For the first reaction:

Try these steps for the second reaction:

[tex]\Delta H_\text{rxn} = -22.3\;\text{kJ}\cdot\text{mol}^{-1}[/tex].

Answer:

C-a tree grows taller

Explanation:

Cell division is cellular reproduction, so C is the only option involving growth/reproducing.

Answer:

The correct answer to this question is: C "A Tree Grows Taller"

Explanation:

Cell division is cellular reproduction.  All mammals eat to take in energy. Plants take in energy from the sun to use and collect the same energy which is then used to do various things. The tree is using Mitosis to its advantage so it can grow. That is why C is the correct answer.

Hope this helped have an amazing day!

Answer:

3.981 x 10⁻⁶.

Explanation:

∵ pH = - log[H⁺]

∴ 5.4 = - log[H⁺]

∴ log[H⁺] = - 5.4

∴ [H⁺] = 3.981 x 10⁻⁶.

Answer:

pH = - log[H⁺]

=> 3.981 x 10⁻⁶

Explanation:

Answer:

22.94 L.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

If n and T are constant, and have two different values of V and P:

P₁V₁ = P₂V₂

P₁ = 367.0 mm Hg, V₁ = 49.0 L.

P₂ = 784.0 mm Hg, V₂ = ??? L.

∴ V₂ = P₁V₁/P₂ = (367.0 mm Hg)(49.0 L)/(784.0 mm Hg) = 22.94 L.

Answer:

(A) melting point, freezing point.

Explanation:

For the same substance: when matter is transitioning from solid to liquid (melting) or liquid to solid (freezing), its temperature is fixed at the melting/freezing point, which is the same temperature.

Answer:melting,freezing

Explanation:

The mouth (can also be a delta or estuary) is where a stream empties into another body of water.

Answer:

The given blank can be filled with mouth.

Explanation:

A body of water comprising surface water flowing within the banks and bed of a channel is known as a stream. The stream comprises groundwater and surface fluxes, which reacts towards the geomorphological, geological, biotic, and hydrological controls. The lengthy and large streams are generally termed as rivers. The mouth of the stream is considered as the point at which the stream releases probably through a delta or an estuary, into a standing water body like ocean or lake.

barium , atomic number 56

Although given the molecular mass of a compound, additional information, most notably the empirical formula, is needed to determine the molecular formula.

To determine the molecular formula of a compound with a molecular mass of 137.32 g/mol, we need additional information, specifically the empirical formula of the compound. The molecular formula is a multiple of the empirical formula, and the multiple is determined by the ratio of the molecular mass to the empirical formula mass.

For example, suppose the empirical formula is CH (which has an empirical formula mass of about 13 g/mol for C and 1 g/mol for H). If the molecular mass is 137.32 g/mol, we would divide the molecular mass by the empirical formula mass (137.32/14), which is about 9.8. This isn't a whole number, so we'd need to adjust the empirical formula. But if the empirical formula is C2H2 (with empirical formula mass of 26 g/mol), then the divisor would be 5.3, again not a whole number. Without knowing the empirical formula, we can't determine the molecular formula.

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Answer: 2.5 × 10⁻⁵ M H₃O⁺ and 4.0 × 10⁻¹⁰ M OH⁻

Explanation:

∵ pH = - log[H₃O⁺]

∴ 4.6 = - log[H₃O⁺].

∴ log[H₃O⁺] = - 4.6.

∴ [H₃O⁺] = 2.51 x 10⁻⁵.

∵ [H₃O⁺][OH⁻] = 10⁻¹⁴.

[H₃O⁺] = 2.51  x 10⁻⁵ M.

∴ [OH⁻] = 10⁻¹⁴/[H₃O⁺] = 10⁻¹⁴/(2.51  x 10⁻⁵ M) = 3.98 × 10⁻¹⁰ M ≅ 4.0 × 10⁻¹⁰ M.

Answer : The concentration of hydroxide and hydronium ion is, [tex]3.9\times 10^{-10}M[/tex] and [tex]2.5\times 10^{-5}M[/tex]

Explanation:  Given,

pH = 4.6

pH : It is defined as the negative logarithm of hydrogen ion and hydronium ion concentration.

[tex]pH=-\log [H_3O^+][/tex]

First we have to calculate the [tex]H^+[/tex] concentration.

[tex]pH=-\log [H_3O^+][/tex]

[tex]4.6=-\log [H_3O^+][/tex]

[tex][H_3O^+]=2.5\times 10^{-5}M[/tex]

Now we have to calculate the pOH.

[tex]pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-4.6=9.4[/tex]

Now we have to calculate the [tex]OH^-[/tex] concentration.

[tex]pOH=-\log [OH^-][/tex]

[tex]9.4=-\log [OH^-][/tex]

[tex][OH^-]=3.9\times 10^{-10}M[/tex]

Therefore, the concentration of hydroxide and hydronium ion is, [tex]3.9\times 10^{-10}M[/tex] and [tex]2.5\times 10^{-5}M[/tex]

The immensely strong heat creates conviction cells to create movement as it follows the currents.

Final answer:

Heat from Earth's core causes convection currents in the mantle, driving the movement of tectonic plates. This movement can create divergent and convergent plate boundaries, leading to the formation of new lithosphere, mountain ranges, earthquakes, and volcanic activity.

Explanation:

The core of the Earth is extremely hot, and this heat plays a crucial role in the movement of tectonic plates that make up the planet's crust and upper mantle. The process of heat transfer from the core to the mantle is known as convection. In this process, warmer material rises due to being less dense, and cooler material sinks because it is denser. This continuous cycle of rising and sinking material creates convection currents in the mantle.

These convection currents are the primary driving force behind the movement of tectonic plates. At divergent boundaries, where two plates are moving apart, new lithosphere forms at ocean ridges due to upwelling currents. Conversely, at convergent boundaries, where plates move toward each other, one plate can be forced under another in a process called subduction, which can lead to the formation of mountains, earthquakes, and volcanic activity. Therefore, the heat from Earth's core is essential in driving the dynamic processes that shape the planet's surface.

Answer:

333.7 g.

Explanation:

Where, ΔTf is the depression in water freezing point (ΔTf = 20.0°C).

Kf is the molal freezing point depression constant of the solvent (Kf = 1.86 °C/m).

m is the molality of the solution.

∴ m = ΔTf/Kf = (20.0°C)/(1.86 °C/m) = 10.75 m.

molaity (m) is the no. of moles of solute per kg of the solvent.

∵ m = (no. of moles of antifreeze C₂H₄(OH)₂)/(mass of water (kg))

∴ no. of moles of antifreeze C₂H₄(OH)₂ = (m)(mass of water (kg)) = (10.75 m)(0.5 kg) = 5.376 mol.

∵ no. of moles = mass/molar mass.

∴ mass of antifreeze C₂H₄(OH)₂ = no. of moles x molar mass = (5.376 mol)(62.07 g/mol) = 333.7 g.

To prevent 500 g of water from freezing at -20.0°C, 333.86 grams of antifreeze [tex](C_2H_4(OH)_2)[/tex] are required. The calculation involves using the freezing point depression formula and converting the molality to grams. Ethylene glycol is the active component in this antifreeze scenario.

To determine how many grams of antifreeze[tex](C_2H_4(OH)_2)[/tex] are required to prevent 500 g of water from freezing at -20.0°C, we can use the freezing point depression formula [tex]\triangle T_f = i mK_f .[/tex]

Here, Δ[tex]T_f[/tex] is the freezing point depression, [tex]K_f[/tex] is the cryoscopic constant for water, and m is the molality of the solution. The constant i is the van 't Hoff factor, which is 1 for ethylene glycol because it does not dissociate in water.

Calculate the required freezing point depression:

Δ[tex]T_f[/tex] = [tex]T_f[/tex] (pure solvent) - [tex]T_f[/tex](solution) = 0°C - (-20.0°C) = 20.0°C

Use the freezing point depression formula to calculate molality:

[tex]\triangle T_f = i mK_f .[/tex]

20.0°C = 1.86°C/m * m

m = 20.0°C / 1.86°C/m = 10.75 m

Calculate the moles of antifreeze required:

molality (m) = moles of solute / kg of solvent

10.75 m = moles of [tex](C_2H_4(OH)_2)[/tex] / 0.5 kg

moles of [tex](C_2H_4(OH)_2)[/tex] = 10.75 m * 0.5 kg = 5.375 moles

Convert moles to grams using the molar mass of [tex](C_2H_4(OH)_2)[/tex] (62.07 g/mol):

grams of [tex](C_2H_4(OH)_2)[/tex] = moles * molar mass = 5.375 moles * 62.07 g/mol = 333.86 g

Therefore, 333.86 grams of antifreeze [tex](C_2H_4(OH)_2)[/tex] are needed for 500 g of water to prevent it from freezing at -20.0°C.

Answer:

D. Catalysts speed up the rate of reactions by lowering the amount of energy required for the reaction to proceed.

Explanation:

A catalyst is a substance that:

A catalyst provides an alternative reaction pathway that has a lower activation energy than the uncatalyzed reaction.

The figure shows how the energy of the reactants and products change during a reaction.

Answer:

9.64

Explanation:

pH + pOH = 14

Since pOH = 4.36, pH would be:

pH = 14 - pOH

pH = 14 - 4.36

pH = 9.64

The answer is 9.46

9.46 pOH

Answer:

glycerol because it is more viscous and has a larger molar mass than water.

Explanation:

Viscosity depends on inter-molecular interactions.

The predominant inter-molecular force in water and glycerol is hydrogen bonding.

Hydrogen bond is an electrostatic attraction between two polar groups in which one group has hydrogen atom (H) and another group has highly electronegative atom such as nitrogen (like in this molecule), oxygen (O) or fluorine (F).

Final answer:

Water has stronger intermolecular attraction compared to glycerol because water has extensive hydrogen bonding. Hydrogen bonding is a strong intermolecular force that occurs when a hydrogen atom is bonded to a highly electronegative atom like oxygen or nitrogen. Glycerol, on the other hand, does not have hydrogen bonding.

Explanation:

The intermolecular attractions or forces between molecules determine the strength of the attractive forces in a substance. In this case, water has stronger intermolecular attraction compared to glycerol because water has extensive hydrogen bonding. Hydrogen bonding is a strong intermolecular force that occurs when a hydrogen atom is bonded to a highly electronegative atom like oxygen or nitrogen. Glycerol, on the other hand, does not have hydrogen bonding.

Water's molar mass is 18.01 g/mol and it can form hydrogen bonds, which makes it highly cohesive and viscous. Glycerol's molar mass is 92.09 g/mol and it does not have the ability to form hydrogen bonds. Therefore, water has stronger intermolecular attractions due to hydrogen bonding, resulting in its higher viscosity compared to glycerol.

Answer:

4.78 %.

Explanation:

mass percent is the ratio of the mass of the solute to the mass of the solution multiplied by 100.

mass % = (mass of solute/mass of solution) x 100.

mass of MgSO₄ = 50.0 g,

mass of water = d.V = (0.997 g/mL)(1000.0 mL) = 997.0 g.

mass of the solution = mass of water + mass of MgSO₄ = 997.0 g + 50.0 g = 1047.0 g.

∴ mass % = (mass of solute/mass of solution) x 100 = (50.0 g/1047.0 g) x 100 = 4.776 % ≅ 4.78 %.

The percent mass of [tex]MgSO_4[/tex] in the solution is approximately [tex]4.77\%[/tex].

To find the percent mass of [tex]MgSO_4[/tex] in the solution, we need to calculate the total mass of the solution and then determine the mass of [tex]MgSO_4[/tex] in it.

Given:

[tex]Mass \ of \ MgSO_4 = 50.0 \ g[/tex]

[tex]Volume \ of \ water = 1000.0\ mL[/tex]

[tex]Density\ of\ water = 0.997 \ g/mL[/tex]

First, we'll find the mass of the water using its density:

[tex]\[ \text{Mass of water} = \text{Density} \times \text{Volume} \][/tex]

[tex]\[ \text{Mass of water} = 0.997 \, \text{g/mL} \times 1000.0 \, \text{mL} \][/tex]

[tex]\[ \text{Mass of water} = 997 \, \text{g} \][/tex]

Now, we'll calculate the total mass of the solution:

[tex]\[ \text{Total mass of solution} = \text{Mass of MgSO}_4 + \text{Mass of water} \][/tex]

[tex]\[ \text{Total mass of solution} = 50.0 \, \text{g} + 997 \, \text{g} \][/tex]

[tex]\[ \text{Total mass of solution} = 1047 \, \text{g} \][/tex]

Next, we'll determine the percent mass of [tex]MgSO_4[/tex] in the solution:

[tex]\[ \text{Percent mass of MgSO}_4 = \left( \frac{\text{Mass of MgSO}_4}{\text{Total mass of solution}} \right) \times 100\% \][/tex]

[tex]\[ \text{Percent mass of MgSO}_4 = \left( \frac{50.0 \, \text{g}}{1047 \, \text{g}} \right) \times 100\% \][/tex]

[tex]\[ \text{Percent mass of MgSO}_4 = 4.77\% \][/tex]

flow of charge of electrons cause current in wire.

Electric current in a wire causes  an electrons flow because of electrical attraction and repulsion. Option D is correct.

Electric current is the flow of electrons through a conductor. Conductors are materials that allow electrons to flow freely. Wires are made of conductors, such as copper or aluminum. When a voltage difference is applied to a wire, it creates an electric field. The electric field causes the electrons in the wire to move.

The electrons move from the negative side of the voltage source to the positive side. The movement of electrons through a wire is what creates an electric current. The amount of current that flows through a wire depends on the strength of the electric field and the resistance of the wire. Electrons are negatively charged particles that orbit the nucleus of an atom. Option D is correct.

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They form when electrons are shared.

Covalent bonds form when atoms share their electrons mutually and equally or unequally depending on their electronegativity. This sharing allows atoms to stabilize and often achieve a noble gas electron configuration. Lewis electron dot diagrams help illustrate such bonds.

Covalent bonds occur when electrons are shared between atoms, creating a mutual stabilization. Unlike ionic bonds which involve the exchange of electrons to form charged ions, covalent bonding is characterized by the sharing of one or more electron pairs. Each atom contributes an electron to the shared pair, resulting in a bond that is typically stronger than an ionic bond. This sharing of electrons allows each atom to attain a more stable electronic configuration, often resembling that of the nearest noble gas.

There are different types of covalent bonds, such as polar covalent bonds where the sharing of electrons is unequal due to differences in electronegativity between the bonded atoms. Conversely, nonpolar or pure covalent bonds involve equal sharing of electrons because of identical or very similar electronegativity values.

For visualization, Lewis electron dot diagrams are often used to illustrate how atoms bond covalently, with shared electron pairs represented by dashes connecting the symbols for the atoms.

Answer:1. Age of earth 2. D. Newer, Older 3. True

Explanation:

Scientists use rock layers to determine the age of Earth. Fossils in newer, or higher, rock layers are typically younger than those in older or deeper layers. And yes, new evidence can indeed lead to changes in scientific understanding.

1. Scientists use rock layers primarily to determine the age of Earth. They do this through a method called stratigraphy, wherein they study the arrangement of rock layers and relative ages to understand the Earth's past. So, the correct answer is C. The age of Earth.

2. Generally, fossils found in newer layers of rock are estimated to be younger than those found in deeper (or older) layers. As sediment is deposited over time, newer layers form on top of older ones, and as a result, newer fossils are typically found closer to the surface. So the correct answer is B. newer, younger.

3. True. New evidence can definitely lead to a change in scientific knowledge. Science is a dynamic and evolving field and new discoveries or data can modify or even completely change previously held theories and understandings.

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Answer:

Amplitude

Explanation:

Answer:

a. amplitude

Explanation:

A large C would indicate a large amplitude and a loud sound. When the amplitude increases in a compression wave, there is an increase in the density of the medium, and in the pressure exerted by the particles.

Answer:

??????

Explanation:

I believe this question is asking what a mitochondria does for a plant cell?

The mitochondria is the digestive system in a plant cell. It’s job is to take in nutrients, break it down, and then create energy from it. The mitochondria is a crucial part of cellular respiration.

Answer:

= 28.745 g

Explanation:

Half life is the time taken by a radioactive element to decay by half the original amount.

Therefore;

New mass = Original mass × (1/2)^n

Where n is the number of half lives, in this case, n = 20/5.27 = 3.795

Therefore;

New mass = 399 g × (1/2)^3.795

                = 28.745 g