Which of these statements is NOT TRUE? Scientists propose explanations that can be explained by examining evidence. Scientists propose explanations that can be explained by examining evidence. Science is an organized way to investigate, understand, and explain events in the natural world. Science is an organized way to investigate, understand, and explain events in the natural world. Scientists collect and organize information randomly, looking for patterns and connections between events. Scientists collect and organize information randomly, looking for patterns and connections between events. Science deals only with the natural world.

Answer: The ratio of the amounts of U 238 and Pb 206 in a rock sample enables the age of the rock to be estimated using the technique of radiometric dating. It moves back in the periodic table until the isotope falls in the band of stability at Pb 206.

Explanation:

No, it is not safe to assume that any coloration seen in an animal is cryptic. While many animals have evolved to have coloration that helps them blend into their environment and avoid predators or attract mates, there are also many animals that have bright and conspicuous coloration for other reasons, such as warning predators of their toxicity or advertising their fitness to potential mates. Therefore, it is important to consider the specific context and behavior of the animal before making assumptions about the purpose of its coloration.

Cryptic coloration refers to an animal's ability to blend in with its environment, making it difficult for predators or prey to spot them. This can help the animal avoid being detected, making it easier to hunt or avoid being hunted. Cryptic coloration can take many forms, including camouflage, mimicry, or disruptive coloration, and is a common adaptation seen in many species of animals, including insects, birds, reptiles, and mammals.

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Answer: ≈ 67.4 g

Explanation:

A(t) = amount remaining in t years        = A0ekt, where A0 is the initial amount and k is a constant to                     be determined.   Since A(1690) = (1/2)A0 and A0 = 80,                   we have 40 = 80e1690k                  1/2 = e1690k                  ln(1/2) = 1690k                  k = -0.0004 So, A(t) = 80e-0.0004t  Therefore, A(430) = 80e-0.0004(430)                             = 80e-0.172                             ≈ 67.4 g

The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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Answer:

12.70

Explanation:

Answer: 31.5L

Explanation:

Ideal gas law is valid only for ideal gas not for vanderwaal gas. The equation used is PV=nRT. Therefore the volume of oxygen gas is 31.5L.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of oxygen gas =78.5 kPa=78,500=0.7747atm

V= volume of oxygen gas=?

n =number of moles of oxygen gas = given mass÷ Molar mass

                                                          = 32.0g÷ 32

                                                          =1 mole

T =temperature of oxygen gas=298K

R = Gas constant = 0.0821 L.atm/K.mol

0.7747atm×V=1 mole×0.0821×298K

V=31.5L

Therefore the volume of oxygen gas is 31.5L.

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Answer:

C option

Explanation:

please Mark me brainliest

Answer:

A magnesium ion mg-2 has A 24 protons and 22 electrons

Before Charles David Keeling's work, reports of atmospheric measurements of CO2 were widely variable and often inaccurate due to several reasons:

Sampling Locations: The early measurements of CO2 were taken at various locations without a consistent sampling strategy. Measurements were made in different regions, including urban areas, forests, and near volcanic activity, leading to inconsistent data.

Sampling Techniques: Different sampling techniques were employed, resulting in varying levels of accuracy. Some methods lacked proper calibration or had limited precision, leading to inaccurate measurements.

Inadequate Equipment: The instruments used for measuring CO2 concentrations were not as advanced or precise as they are today. They lacked the sensitivity required to accurately detect and measure low concentrations of CO2 in the atmosphere.

Charles David Keeling significantly improved the accuracy of measuring CO2 by implementing the following measures:

Keeling Curve: Keeling established a systematic measurement program in 1958 at the Mauna Loa Observatory in Hawaii. He initiated continuous measurements of atmospheric CO2 concentrations, known as the Keeling Curve. This long-term, consistent dataset provided valuable insights into the trend of increasing CO2 levels over time.

Calibration: Keeling meticulously calibrated his equipment, ensuring accurate and consistent measurements. He used high-precision infrared analyzers and standardized calibration gases to establish accurate reference points for CO2 concentration measurements.

Sampling Strategy: Keeling selected a remote location, Mauna Loa Observatory, far from local pollution sources and vegetation influences. This allowed for a representative measurement of background atmospheric CO2 levels.

Data Analysis and Quality Control: Keeling employed rigorous data analysis techniques and implemented quality control measures to identify and correct any potential errors in the measurements. This ensured the accuracy and reliability of the collected data.

Keeling's work and the establishment of the Keeling Curve laid the foundation for our understanding of the rising atmospheric CO2 levels and its implications for climate change. The accuracy and consistency of his measurements have been instrumental in shaping our knowledge of CO2 concentrations in the atmosphere.

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The three-dimensional area that the closed surface encloses is known as the volume. Mass divided by volume equals density. Density and volume have a clear inverse relationship. In other words, any change in volume will cause a change in density, and vice versa.

The change in y split by the change in x is the formula for a straight line's slope. Slope is equal to the mass divided by volume since the x and y axes are both equal to mass and volume, respectively. As a result, density is equal to the slope of a mass vs volume graph.

Density=Mass/Volume is a common formula used to describe the mathematical connection between mass and density.

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Answer:

the answer is

removing seed casings from grains

removing salt from seawater

Explanation:

This question is regarding mixing and separating such as a physical change.

a soda bottle bubbling is a chemical reaction

copper statue is a chemical reaction

water decomposing to oxygen and hydrogen is also a chemical reaction

this question is talking about mixing and seperating as a physical change

The spontaneity of a reaction is determined by the Gibbs free energy change (∆G), which is a measure of the system's ability to do work.

The equation that links ∆G, ∆H, and ∆S is: ∆G = ∆H - T∆S, where T is the temperature in Kelvin and ∆H and ∆S are the enthalpy and entropy changes, respectively. The signs of ∆H and ∆S determine whether the reaction is exothermic or endothermic and whether it is entropy-driven or enthalpy-driven, respectively.

If ∆G is negative, the reaction is spontaneous, meaning it occurs without the input of energy.The given reaction has a ∆H of 23.25 kJ and a ∆S of 161.26 J/mol∙K.

First, we need to convert the units of ∆S from J/mol∙K to kJ/mol∙K by dividing by 1000.∆S = 161.26 J/mol∙K ÷ 1000 = 0.16126 kJ/mol∙K Substitute the values into the equation to determine the spontaneity of the reaction:

∆G = ∆H - T∆S∆G = (23.25 kJ) - (298 K) x (0.16126 kJ/mol∙K)∆G = 23.25 kJ - 48.02 kJ∆G = -24.77 kJ Since ∆G is negative, the reaction is spontaneous.

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Answer:

the Anweser is 0.6%

Explanation:

Answer:

0.6%

Explanation:

because it is

Answer: 0.3 moles NH3

Explanation:

Answer:

See explanation

Explanation:

The reaction of NaOH and KHP is a neutralization reaction. The molarity of KHP is often calculated from the mass of KHP used to prepare the standard solution.

KHP is a slightly acidic substance. It is used as a primary standard for acid-base titrations because the solid is stable in air hence it is easy to weigh accurately. Also, the solid is neither hygroscopic nor deliquescent.

If student A recorded the amount of KHP used for the titration as 0.10g instead of 0.15g, then the molarity of NaOH calculated will be less than the actual the actual molarity of the NaOH.

Answer:

40 - 20 = 20

20/4 = 5m/s

The difference in velocity divided by the rate = acceleration.

Answer:

option b is correct

..............

Answer:

it C not D btw

Explanation:

The amount, in grams, of radon that will be collected in the office sample of air, would be 148.8 grams.

The air sample contains 3.20 x 10⁻⁴ mg of radon per mL of gas. A total air volume of 4.65 x 10⁴ L passed through the office. The amount of radon in the air that passed through the office can be estimated as follow:

Amount of radon per mL of gas = 3.20 x 10⁻⁴ mg

Total volume of air in sample = 4.65 x 10⁴ L

The total air volume needs to be converted to mL:

4.65 x 10⁴ L x 1000 = 4.65 x \(10^7\) mL

1 mL = 3.20 x 10⁻⁴ mg

4.65 x \(10^7\) mL = 4.65 x \(10^7\) x 3.20 x 10⁻⁴

                       = 14.88 x \(10^4\) mg

In other words, the total amount of radon gas in the sample of air is 14.88 x \(10^4\) mg.

1 g = 0.001 mg

14.88 x \(10^4\) mg = 14.88 x \(10^4\)/1000

                        = 148.8 grams

In summary, the total amount of radon gas that will be collected in the office sample would be 148.8 grams.

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Answer:

Smaller Atomic Radius, High Ionization Affinity, and High Electron Affinity

[Note:  It is Br2, not B2, the bomber]

Explanation:

a) Smaller Atomic Radius  YES  Each of these elements have a high number of electrons that nearly fill the lower energy orbitals, forcing the protons in the nucleus to cluster togeter more tightly.

b) High Metallic Character NO

c) High Ionization Energy    YES  - They want to keep their electrons, so the ionization energy is high.

d) High Electron Affinity  YES  They attract electons from anything that comes nearby.

Covalent bonds can form between atoms that are similar to one another or between atoms whose electronegativity differences are inadequate to permit the transfer of electrons to form ions.

Chemical bonding between atoms creates compounds, which have distinctive structures made up of two or more atoms. Chemical formulas can be used to describe a compound's fundamental makeup. A covalent bond is the attraction between two atoms that share a pair of valence electrons. Both atoms' nuclei are attracted to the shared electrons. A molecule containing two or more atoms is created as a result of this. Molecules are created when similar or unrelated atoms come together. Thus, a hydrogen molecule is created when two hydrogen atoms come together. Almost all atoms can interact with other atoms.

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Among the given options, the molecules that would be able to pass freely through a plasma membrane are:

c. H₂O (water)

d. CO₂ (carbon dioxide)

e. C₆H₁₂O₆ (glucose)

Water (H₂O) is a small, polar molecule that can pass through the plasma membrane via simple diffusion or through specialized water channels called aquaporins.

Carbon dioxide (CO₂) is a small, nonpolar molecule that can also pass through the plasma membrane via simple diffusion.

Glucose (C₆H₁₂O₆) is a larger, polar molecule, but it can still pass through the plasma membrane via facilitated diffusion using specific glucose transport proteins.

On the other hand, NaOH (sodium hydroxide) and C₁₀H₁₃N₅O₄ (a compound with specific chemical composition) are larger and/or charged molecules, which typically cannot freely pass through the plasma membrane without the assistance of specific transport mechanisms or channels.

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When 0.0257 g of Al react completely in the thermite reaction, the mass of Fe formed is 0.106 g, according to the balanced equation Fe₂O₃ + 2Al → Al₂O₃ + 2Fe.

The balanced equation for the thermite reaction is Fe₂O₃ + 2Al → Al₂O₃ + 2Fe. From the balanced equation, we can see that 2 moles of aluminum react with 1 mole of iron (Fe). We need to calculate the amount of iron that would form when 0.0257 g of aluminum reacts completely. First, we calculate the number of moles of aluminum,

moles of Al = mass of Al / molar mass of Al

moles of Al = 0.0257 g / 26.98 g/mol

moles of Al = 0.000952 mol

From the balanced equation, we can see that 2 moles of aluminum react with 2 moles of Fe. Therefore, the number of moles of Fe produced would be,

moles of Fe = 2 x moles of Al

moles of Fe = 2 x 0.000952 mol

moles of Fe = 0.00190 mol

Finally, we can calculate the mass of Fe produced using its molar mass,

mass of Fe = moles of Fe x molar mass of Fe

mass of Fe = 0.00190 mol x 55.85 g/mol

mass of Fe = 0.106 g

Therefore, 0.0257 g of Al reacts completely to form 0.106 g of Fe.

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The electronic configuration of the elements of the second group of the second period is 1s²2s²2 1s2 2p6 3s2 3p64s² or 2,8,8,2

To determine the external electronic configuration of an element, knowing the number is needed. Electrons and usage configuration rules (or electron energy levels).

The number of electrons in a neutral atom is the same as the number of protons.

The number of protons is the atomic number of the element. The

elements are arranged in the periodic table according to their atomic number.

The elements of group 2 are calcium and magnesium

The atomic number, number of protons, and number of electrons of group 2 elements are 40

Now we can distribute the electrons according to the structural rules:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

The outer shell has n = 2, so the outer electron configuration is 4s²

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moisture, condensation, and temperature. 2. Evaporation and condensation are part of how a cloud forms.

Answer:

Explanation:

Earthquakes are normally caused by underground rock breaking along a fault line. The seismic waves that cause the earth to shake are caused by this sudden release of energy. The plates or blocks of rock begin to move during and after the earthquake, and they continue to move until they become trapped again. As fluid near the center heats up, convection currents develop within the Earth's mantle. Particles pass more quickly as the core heats the bottom layer of mantle material, lowering its density and allowing it to rise. The convection current is started by the growing material.

\(\\ \sf\longmapsto FeP\)

\(\\ \sf\longmapsto Fe_2S_3\)

\(\\ \sf\longmapsto FeCl_2\)

\(\\ \sf\longmapsto MgCl_2\)

\(\\ \sf\longmapsto MgO\)

\(\\ \sf\longmapsto Mg_3N_2\)

\(\\ \sf\longmapsto Na_3P\)

\(\\ \sf\longmapsto Na_2S\)

\(\\ \sf\longmapsto CoO\)

\(\\ \sf\longmapsto Co_2S_3\)

\(\\ \sf\longmapsto AlCl_3\)

\(\\ \sf\longmapsto CsBr\)

\(\\ \sf\longmapsto Ti_2O_4\)

\(\\ \sf\longmapsto Ag_2S\)

To make an E9 mixture 8657.14 gal of E7 should be mixed with 3000 gal of E10

Given to us is the amount of ethanol in the E10 mixture is 10% of 3000 gallons:

Ethanol in E10 = 10% × 3000 gal = 0.10 × 3000 gal = 300 gal

To solve this problem, we can set up an equation based on the amount of ethanol in each mixture.

Let x represent the amount of E7 mixture (in gallons) that needs to be added to the E10 mixture to obtain the desired E9 mixture.

The amount of ethanol in the E7 mixture is 7% of x gallons:

Ethanol in E7 = 7% ×  gal = 0.07 × gal

The resulting E9 mixture will contain 9% ethanol of the total volume of 3000 + x gallons:

Ethanol in E9 = 9% × (3000 + x) gal = 0.09 × (3000 + x) gal

According to the problem, the resulting E9 mixture contains 906 gallons of ethanol:

Ethanol in E9 = 906 gal

Now we can set up the equation:

Ethanol in E10 + Ethanol in E7 = Ethanol in E9

300 gal + 0.07x gal = 906 gal

Subtracting 300 gal from both sides:

0.07x gal = 606 gal

Dividing both sides by 0.07:

x = 606 gal / 0.07

x = 8657.14

Therefore, approximately 8657.14 gallons of E7 mixture should be mixed with 3000 gallons of E10 to make an E9 mixture.

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Complete question: Ethanol fuel mixtures have "E" numbers that indicate the percentage of ethanol in the mixture by volume. For example, E10 is a mixture of 10% ethanol and 90% gasoline. How much E7 should be mixed with 3000 gal of E10 to make an E9 mixture?