Antonio and Addie want to know if perfume fumes affect plant height. They place five identical bean plants in five identical light boxes. In four of the boxes, they place 200 milliliters (mL) of perfume at different distances from the plants, and they make observations twice a week for one month. Which choice best identifies the observation data that should be included in their data table?

Answer: 78742

Explanation: 8273

Answer:

A

Explanation:

asteroids most often leave trails due to the large amount of friction that occurs.

The bright spatial object with a tail moving fastly across the sky is called a comet. Comets are made of rock, dust and ices.

Comets are orbiting snowballs around sun made of frozen gases, rock, and dust. They enlarge to the size of a sizable town when frozen. A comet heats up and ejects dust and gases into a huge, blazing head that is larger than most planets when its orbit puts it near to the Sun.

Millions of kilometers away from the sun, the dust and gas combine to form a tail. The Kuiper Belt and much further Oort cloud are presumably home to billions of comets that orbit our sun.

Some of their ice begins to melt and boil off as the comet approaches the sun, along with some dust. The coma, which is created by these particles and gases, surrounds the nucleus.

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The hydroxide ion concentration, [OH-], for a solution with a pH of 4.65 is approximately 3.55 x \(10^{-10}\)M.

What is concentration?

To calculate the hydroxide ion concentration, [OH-], from the given pH, we can use the following relationship:

pH + pOH = 14

where pOH is the negative logarithm of the hydroxide ion concentration:

pOH = -log[OH-]

Rearranging the first equation, we get:

pOH = 14 - pH

Substituting the given pH value of 4.65, we get:

pOH = 14 - 4.65 = 9.35

Finally, we can calculate the hydroxide ion concentration, [OH-], by taking the antilogarithm (inverse log) of the pOH value:

[OH-] = \(10^{(-pOH)}\) = \(10^{-9.35}\) = 3.55 x \(10^{-10}\) M

Therefore, the hydroxide ion concentration, [OH-], for a solution with a pH of 4.65 is approximately 3.55 x \(10^{-10}\) M.

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Answer:

The correct answer is 0.6 mL.

Explanation:

We use the mathematical expression:

Ci x Vi = Cf x Vf

Where Ci is the initial concentration (5 M); Cf and Vf refers to final concentration (0.002 M) and final volume (1500 mL). With the given data, we calculate the initial volume (Vi):

Vi = (Cf x Vf)/Ci = (0.002 M x 1500 mL)/(5 M) = 0.6 mL

Therefore, we need 0.6 mL of 5 M NaCl to prepare the solution with the requested dilution.

Answer:

C. Gases in the atmosphere prevent heat from escaping

Explanation:

Took one for the team and caught an L, C was the right answer

The greenhouse gases are known as the gases which absorb the infrared radiations and create greenhouse effect. Gases in the atmosphere prevent heat from escaping is the greenhouse effect. The correct option is C.

The process by which the radiations of the sun are absorbed by the green house gases and are not reflected back into the space is defined as the greenhouse effect. This insulates the earth and prevents it from freezing.

The green house effect increases the surface temperature of earth and also causes global warming.

Thus greenhouse effect is option C.

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Answer:

the correct answer is baron

Metalloid which is having 3 electrons in the valance shell is boron. option A is correct.

Metalloids are those which show the property of both the metals and nonmetals in other words we can say that they will always show intermediate properties of both the metal and nonmetal

They are also known as semiconductors and their conduction can be increased by doping in which we add some impurities to increase their conductivity. By adding some metals to increase the conductivity or by adding some nonmetals to decrease the conductivity.

Boron is mostly in a crystalline solid state and some other major components of it’s are boric powder etc. They  are situated in the 13th group of the periodic table and have 3 electrons in their outermost shell and are highly reactive and unstable due to partially filled s orbital

Therefore, they have 3 electrons in their outermost shell. Option A is correct.

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The balanced form of the nuclear equation is as follows; 249/98 Cf + 15/7 N⟶ 260/105 Db + 4(1/0) n.

A nuclear equation is process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

According to this question, Californium element is a reactant to produce dubnium and a neutron as products.

However, the law of conservation of mass must be fulfilled by ensuring the mass and atomic numbers of elements in reactant and product side are the same.

249/98 Cf + 15/7 N⟶ 260/105 Db + 4(1/0) n

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The piece of evidence that best identifies the type of reaction as nuclear or chemical is: Chemical, because a new substance is formed. Option 4

In this scenario, the observation that a new substance is formed is a key characteristic of a chemical reaction. Chemical reactions involve the rearrangement of atoms to form different substances with distinct properties. The formation of a new substance indicates a chemical change has occurred.

The other pieces of evidence listed do not necessarily point to a nuclear reaction:

Chemical, because energy is released during the reaction: Energy can be released in both nuclear and chemical reactions, so this observation alone is not sufficient to determine the type of reaction.

Nuclear, because energy is released during the reaction: While energy can be released in nuclear reactions, it is not exclusive to them. Chemical reactions can also release energy, such as in exothermic reactions.

Nuclear, because the mass decreased after the reaction: This observation suggests a change in mass, which could be indicative of a nuclear reaction. However, it is important to consider that chemical reactions can also involve changes in mass, such as the formation of gases or dissolution of a solid.

Overall, the most conclusive evidence to identify the type of reaction is the formation of a new substance, which aligns with a chemical reaction.

Option 4

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The question requires us to calculate the amount of hydrogen gas that would evolve when reacting 5 ng of lead (Pb) with hydrochloric acid (HCl).

The reaction between Pb and HCl produces lead chloride and hydrogen gas, as shown below:

Pb + 2HCl -> PbCl2 + H2(g)

With the stoichiometric coefficients from the reaction, we can now calculate the amount of gas produced when 5 ng of metal are used.

First, we need to convert the mass of Pb into its number of moles, considering the atomic mass of Pb (207.2 u):

207.2 g of Pb --------------- 1 mol of Pb

5 x 10^-9 g of Pb ----------- x

Solving for x, we have that 5 ng of Pb corresponds to 0.024 x 10^-9 moles or 0.024 moles of Pb.

(note that the unit of mass used is nanogram, which corresponds to 10^-9 g)

Now, from the reaction, we have that:

1 mol Pb ------------------------------ 1 mol H2

0.024 x 10^-9 mol Pb ----------- y

Solving for y, we have that 0.024 nmol of H2 are produced.

We can convert the amount of H2 gas calculated into volume, considering the Standard Temperature and Pressure conditions (1 mol = 22.4 L under STP):

1 mol H2 ----------------------------- 22.4 L of H2

0.024 x 10^-9 mol H2 ---------- z

Solving for z, we have that 5.38 x 10^-10 L or 53.8 nL of H2 would be produced from 5 ng of Pb.

Answer:

Black holes are merely the most exotic example of the general principle that ... quantum computer stores bits on protons and uses magnetic fields to flip them. ... Powered by Standard Model software, the universe computes

Explanation:because they are mostly exotic

Answer:

b

Explanation:

sugar crystals are amzing

A polarimeter fundamental working principle entails the following: By passing light via a polarizer, one can produce light with a precisely prepared linear polarisation state.

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Answer:

isotopes, there elements with a diffrent type atomic weight then the original, usally due to a higher amout of neutrons than the original. Some Isotopes are just as useable as the normal versions, but in some cases, such as Uranium, they can be even more radioactive than the original form

Answer:

It's A., thats conduction and its a heat transfer

Explanation:

Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

THANKS

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Answer:

P = pressure T = temperature

Stoichiometry is used in formulating airbags that shows relationship between product and reactants.

The quick chemical decomposition of solid sodium azide (NaN3) that allows the air bag to inflate fast at any time when the car hit anything. The decomposition reaction is initiated in a car by a small ignition that occurs due to collision sensing mechanism. The nitrogen gas produced during the reaction inflates the air bag which protect the person in the car.

So we can conclude that Stoichiometry is used in formulating airbags that shows relationship between product and reactants.

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Stoichiometry is important in formulating airbags, producing contrails, or formulating rocket engines so as to ensure the required amount of products are formed.

Stoichiometry is the molar relationship between the reactants and products of a reaction.

It is the ratio in which moles of reactants of a reaction combine to form moles of products.

Stoichiometry is important in determining the amount of reactants required to produce a given amount of products.

For example, stoichiometry is important in formulating airbags, producing contrails, or formulating rocket engines in order to ensure the mass of reactants used is enough to produce the required products.

In conclusion, stoichiometry of  a reaction provides the knowledge about the amount of reactants required to form products.

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The arrow in a chemical equation represents the direction of the reaction. It indicates the conversion of reactants into products. The arrow points from the reactant side to the product side, symbolizing the flow of the reaction.

The purpose of the arrow is to visually represent the chemical transformation occurring in the reaction. It shows the relationship between the reactants and products and the direction in which the reaction proceeds. The arrow implies that the reactant molecules are being rearranged and transformed into new substances with different properties.

Chemical equations are used to describe the stoichiometry and balance of reactions. The arrow helps convey this information by illustrating the overall process taking place. It serves as a crucial element in understanding the reaction's composition, reaction conditions, and the substances involved.

Furthermore, the arrow also implies that the reaction can occur in both directions. In reversible reactions, the arrow can be represented as a double-headed arrow, indicating that the reaction can proceed in either direction depending on the conditions.

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Answer:

true

Explanation:

the climate can sometimes be measured in thousand

Answer:

A substance's specific heat tells you how much heat is required to ... the temperature of 1.0 g of that substance by 1∘C . ... ΔT - the change in temperature, defined s final ...

Answer: 313,632 seconds

Explanation:

Answer:

B.Urea

Explanation:

When an amino acid is broken down, the nitrogen it contains is converted into urea by the liver which then is excreted via the kidneys.

Answer:

urea

Explanation:

when u eat proteins the body breaks them down into amino acids . Ammonia is produced from leftover amino acids and it must be removed from the body. the liver produces many chemicals (enzymes) that change ammonia into a form called ureas

The density of the iron pyrite cube is 1.343 g/cm³.

Given,

Side of iron pyrite cube = 0.31 cm

Mass of iron pyrite = 0.040 g

The volume of iron pyrite cube = s³ cm³

Or, volume = 0.029791 cm³

We have to find the density of the sample.

Density is defined as the mass per unit volume. Or, it is the ratio of mass to the volume of the substance.

Using the formula for density, we get,

Density = mass/volume

Or, density = 0.40/0.029791

Or, density = 1.343 g/cm³

Hence, the density of the iron pyrite cube is 1.343 g/cm³.

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Reactants - The substance which participate in a chemical reaction are called reactants.

\( \rm \: Example - H_2 \: , \: O_2\)

Product - The substance which are formed by chemical reaction between the reactants are called product.

\(\rm \: Example - H_2 O\)

Explanation:

reactant is a substance that is present at

the start of a chemical reaction.

product is a substance

that is present at the end of a chemical

reaction.

128.4 grams of carbon are required to produce 10.7 moles of methane.

The balanced chemical equation for the reaction C + 2H2 - CH4 is as follows:C + 2H2 ⟶ CH4.

In this equation, we can see that for one mole of methane (CH4), one mole of carbon (C) and two moles of hydrogen (H2) are required.

The molar mass of carbon is 12 g/mol.

The molar mass of methane is the sum of the molar masses of its constituent atoms, which is 12 g/mol (for carbon) + 4(1 g/mol) (for hydrogen) = 16 g/mol.

To find the amount of carbon required to produce 10.7 moles of methane, we can use the following proportion:1 mole CH4 : 1 mole C

Therefore,10.7 moles CH4 : x moles C.

Thus,x = 10.7 moles C.

Since we know the molar mass of carbon (12 g/mol), we can convert the moles of carbon to grams:mass = moles × molar massmass of carbon required = 10.7 moles × 12 g/mol= 128.4 g.

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Answer:

neon

Explanation:

there are 10 protons