1. Three scientists measure the standard meter bar kept at the International Bureau of Standards. Their measurements are 1.09 m, 1.09 m, and 1.08 m. Are their measurements accurate, precise, or both? Why?​

The mass of chlorine needed to create the maximum amount of NaCl would be, Chlorine mass =41.56 g Cl x 33.2% = 13.7 g Cl.

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The mass of chlorine needed to create the maximum amount of NaCl would be, Chlorine mass =41.56 g Cl x 33.2% = 13.7 g Cl.

To determine the mass of chlorine needed to create the maximum possible amount of NaCl, we must first look at the percent composition of sodium chloride.

Sodium chloride is composed of 58.44% Na and 41.56% Cl. This means that for every 100 grams of sodium chloride, 58.44 grams is sodium and 41.56 grams is chlorine.

Since we have 20.0 g of sodium, we can calculate the amount of chlorine needed to create the maximum amount of sodium chloride.

First, convert 20.0 g of sodium to a percentage: 20.0 g of sodium is 33.2% of 58.44%. Then, multiply 41.56 grams of chlorine by 33.2%: 41.56 g Cl x 33.2% = 13.7 g Cl.

Therefore, the maximum amount of sodium chloride that can be created from 20.0 g of sodium and 13.7 g of chlorine is 34.1 g.

To create this amount of sodium chloride, we need 20.0 g of sodium and 13.7 g of chlorine.

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A healthy behavior can be maintained by maintaining healthy relationships with supportive friends and family, keeping good hygiene, having enough sleep, exercising etc.

Maintaining a healthy behavior is very important not just for our emotional and mental health but also for our overall physical as well as social well being too. Our behavior reflects our attitude as well as our beliefs.

A healthy behavior can be maintained by healthy social interaction amongst our peers, supportive friends, family and also in the community as well as institution which we are a part of. One can also maintain healthy behavior by adopting healthy habits like exercising, sleeping on time, keeping good hygiene etc.

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To remove electrons in the photoelectric experiment, experimenters must try blue light. (B)

The photoelectric effect occurs when one of the metal plates is exposed to light, there is a current going to the other metal plate, as has been detected by the ammeter in the circuit above.

The ability of light to move electrons depends on its frequency. So if for example the light intensity is small but the frequency is large, the electrons will still be able to escape.

The energy that causes this movement of electrons is from the electromagnetic waves of light.

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An atom is made up of three subatomic particles namely; protons, neutrons and electrons.

The proton is the positively charged particle in the nucleus of the atom while the electron is the negatively charged particle surrounding the nucleus.

The number of neutrons can be calculated by subtracting the atomic number of the element from the mass number.

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We must now strike a balance. This portion is all guesswork, but look at nitrogen on the right; there are two of them, so we put a "2" next to nitrogen monoxide.

We then count to check whether everything is balanced, and we'll notice that there are now two oxygens on the left and only one on the right, so we'll put a "2" next to the water. Count again, and lastly, a "2" next to the hydrogens will give us a balanced equation of:nitrogen monoxide.  Now there are rate laws. If your reaction was A+B—>C+D. The rate law is equal to some empirically established constant "k" times the concentration of the reactants increased to some value. power (also empirically determined) (also experimentally determined). So the general form is as follows: Alpha and Beta are just the order of the reactants. Because the question specifies the sequence of each reactant, your rate law should look like this.

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Carbohydrate. The word derives from the fact that the majority of compounds in this chemical class are produced from the combination of carbon and water.

Water is a compound because it is made up of two elements: hydrogen and oxygen. Water, on the other hand, is not the same as oxygen or nitrogen. While water is a liquid, oxygen and nitrogen are gases. To be more specific, all quantitative estimates are made for glucose, the most important hexose in human metabolism. Organic compounds are those with a carbon atom backbone, whereas all other compounds are classified as inorganic. Carbohydrate. The word derives from the fact that the majority of compounds in this chemical class are produced from the combination of carbon and water.

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To calculate the percentage yield of a reaction, you need to know the theoretical yield (the maximum amount of product that can be produced based on the stoichiometry of the reactants) and the actual yield (the amount of product that is actually produced in the reaction).

The balanced equation for the combustion of hydrogen gas (H2) with oxygen gas (O2) to form water vapour (H2O) is:

2H2 + O2 -> 2H2O

From the balanced equation, we can see that for every 2 moles of H2, 1 mole of H2O is produced. To convert 4 grams of H2 to moles, we use the molar mass of H2 which is 2.016 g/mol.

4g / 2.016 g/mol = 1.98 moles

Now we can calculate the theoretical yield of H2O. Since 2 moles of H2O are produced for every 2 moles of H2, the theoretical yield of H2O is:

1.98 moles x (2 moles H2O / 2 moles H2) = 1.98 moles

The molar mass of H2O is 18.02 g/mol, we can convert the theoretical yield of H2O from moles to grams:

1.98 moles x 18.02 g/mol = 35.7 g

To calculate the percentage yield, we divide the actual yield (18 g) by the theoretical yield (35.7 g) and multiply by 100:

(18 g / 35.7 g) x 100 = 50.5 %

Therefore, the percentage yield of the reaction is 50.5%.

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The acid rain is the result of pollutants being released into the atmosphere.

What is acid rain ?

Nitric and sulfuric acids, which are included in acid rain and other dry, abrasive particles that fall to the ground, can harm the surfaces of sculptures, buildings, and other man-made structures. Metal is corroded by the acidic particles, which also hasten the aging of stone and paint.

What is pollutants ?

A material that is present in concentrations that could be harmful to creatures (including people, animals, and plants) or go beyond the limits of acceptable environmental quality is referred to as a pollutant. Frequently, the words "term" and "contaminant" are used interchangeably.

Therefore, acid rain is the result of pollutants being released into the atmosphere.

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Answer:

Hydropower technologies generate power by using the elevation difference, created by a dam or diversion structure, of water flowing in on one side and out, far below, on the other.

Answer: Statistics is the best way for Margarita to organize, interpret, and present her data.

Explanation:

B) The number of Br- ions present in 1.00 moles of FeBr3 is 6.02E23.

To find the number of Br- ions present in 1.00 moles of FeBr3, we need to first determine the number of moles of Br- ions present in the compound. FeBr3 is a compound that contains 1 Br- ion per formula unit.

To find the number of moles, we can use the formula:

moles = number of atoms / Avogadro's number (6.02E23)

The number of moles of Br- ions in 1.00 moles of FeBr3 is:

1.00 moles x (1 Br- ion / 1 formula unit) = 1.00 moles

So, the number of Br- ions present in 1.00 moles of FeBr3 is 6.02E23 ions.

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The value for k that transforms the function f into g is -3.

What is the meaning of value for k?

Value for k is a term used in mathematics to refer to the number of elements in a set. The value of k depends on the context of the problem. It could be any numerical value, depending on what it is being used for.

Given : g(x) = f(x) + k

Taking two points from the graph (1,0) and (-1, 2)

slope =   [tex]\frac{2-0}{-1-1}[/tex] =  [tex]\frac{2}{-2}[/tex] = -1

The equation will be,

                       y-0 = -1 (x-4)

                          y= -x + 4

                        f(x)= -x + 4

  So,                g(x)= f(x) + k

                    -x + 1= -x + 4 + k

                          k= 1+4

                          k= -3

Therefore, the value for k= -3.

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When hydrogen bonds develop between the molecules, the boiling point of water rises. Hydrogen bonds are created when the electronegative oxygen atoms of two different water molecules combine.

Has a hydrogen atom that it can attach to in a separate water molecule. The molecules are hence strongly attracted to one another. In order to make a hydrogen bond, two atoms from either the same or a distinct molecule are required. Hydrogen bonds can form in two different ways: Between-molecule H-bonding molecules form hydrogen bonds. Hydrogen bonding is possible when the hydrogen atom in a molecule is attached to a strongly electronegative atom. One hydrogen atom in water is wedged between two oxygen atoms, creating a solid bond with the following water molecule.

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Answer:

phosphorus=38.27%

hydrogen=2.47%

oxygen=59.26%

The test variable is manipulated while the outcome variable is observed.

When we use the term variable, our minds would have to go to something that has the ability to change. As such, when we are carrying out an experiment there is the variable that we manipulate and this would lead to a change in another variable.

The variable that we are able to manipulate as we are carrying out the experiment is what we call the test variable while the one that is changed due to this manipulation is called the out come variable.

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Answer: simple and complex.

Explanation:These are also called simple sugars. They're found in refined sugars, like the white sugar you see in a sugar bowl. If you have a lollipop, you're eating simple carbs.

The elements most likely to react in the same manner in a chemical reaction are those that are in the same group. It because of the same number of valence electrons.

The elements in the same group are most likely to react in the same manner in a chemical reaction. It is because their outer shells have the same number of valence electrons. In fact, the electrons are the component of an atom that is involved in reactions. Meanwhile, the protons and neutrons in an atom's nucleus are not involved in reactions.

For example:

- They all have one valence electron, which they easily lose when forming ions.

- They are easily reacted with water

- They possess low melting points and densities

- They are good electrical conductors.

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Answer:

36g

Explanation:

H2 = 2

O = 16

18 = Mr of H2O

mass = moles x Mr

mass = 2 x 18

mass = 36g

The kinetic energy of a car with a mass of 1500 kg running at a velocity of 20 m/s to the east is  60000J (Joules).

The kinetic energy of an object is the energy it possesses due to its motion. It is calculated by using the formula KE = 0.5 * m * v^2, where m is the mass of the object in kilograms and v is its velocity in meters per second.

So, for a car with a mass of 1500 kg running with a velocity of 20 m/s to the east, the kinetic energy can be calculated as follows:

KE = 1/2 * 1500 kg * (20 m/s)^2

KE = 60000 J

By plugging these values into the formula, we can find that the car's kinetic energy is 60000 J (Joules). It's worth noting that kinetic energy is a scalar quantity and has no direction, so the velocity's direction (east) does not affect the calculation.

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if the mass of the sample is 272 grams, the number of moles of anhydrate present would be:

moles = 2

Generally, To determine the number of moles of anhydrate present, you would need to know the mass of the sample. If you have that information, you can use the formula:

moles = mass / molar mass

Where

mass is the mass of the sample in grams and

molar mass is the molar mass of the salt (in this case, 136 g/mol).

For example, if the mass of the sample is 272 grams, the number of moles of anhydrate present would be:

moles = 272 / 136

= 2

Please provide me with more information so that I could give you more accurate answer.

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Answer:

Force=Work done÷ distance travelled

Explanation:

To do this, you want to make the Force variable on its own so you divide d on both sides to get F=W/d

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12,005 barium atoms would have to be laid side by side to span a distance of 2.60 mm

Barium can be defined as a chemical element with the symbol Ba and atomic number 56.

To find the number of barium atoms that would have to be laid side by side to span a distance of 2.60 mm.

we need to divide the distance by the radius of one barium atom:

2.60 mm / 217 pm = 12,005

Therefore, 12,005 barium atoms would have to be laid side by side to span a distance of 2.60 mm.

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The answer is  3.88 g/cm³ for density.

When you know the radius, you may use the formula volume = (4/3) π r3 to calculate the sphere's volume. Then, using the formula mass = volume density, you can calculate the mass by multiplying the volume by the density: mass = volume density. The formula mass = (4/3) π r3 density can also be used.

Given,

Radius of gold sphere is equal to 272 pm or 272 × 10 ⁻¹² m.

=  2.72 10 10 m 10²cm/m.

The diameter of an atom of gold is 2.72 × 10⁻⁸ cm,

volume of sphere = πr³

V(Au) = 4/3 · (2.72·10⁻⁸ cm)³ · 3.14.

The volume of one atom of gold is 8.43·10⁻²³ cm³

Mass of atom of sphere is equal to 3.27·10⁻¹³ ng · 10⁻⁹ g/ng

Gold atom mass is 3.27·10⁻²² g grams,

density of sphere = mass of gold atom ÷ Volume of gold atom

density of sphere = 3.27·10⁻²² g ÷ 8.43·10⁻²³ cm³

One gold atom has a density of 3.88 g/cm³

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Single-replacement reactions will occur if the reaction below occurs

K(s) + ZnCl₂(aq) →→→ KCl₂ + Zn.

This is also referred to as single displacement reaction and it is referred to as a reaction in which one element is substituted for another element in a chemical reaction.

Single-replacement reactions will occur in the reaction below because it follows and obeys this condition which is:

A + BX ⇒  B + AX

K(s) + ZnCl₂(aq) →→→ KCl₂ + Zn.

Here we can deduce that zinc was substituted which is therefore the reason why it was chosen as the correct choice in this scenario.

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Prediction 1 best shows what the population could look like after many generations. Because, the long beak traits is having more life time.

Each characteristics in a living thing is created by a respective genetic coding in its body. The genetic code which is responsible for a particular behavior or appearance is called a genetic trait.

Here, the prediction 1 is best . It already saying that long-beak hummingbirds are more likely to survive, that baby survived long enough to pass on its mutation, so the long-beak trait became more common over generations.

Prediction 2 says abut a  genetic trait which is less fit to survive. Hence, cannot affect the next generation population. Therefore, prediction 1 is best.

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Your question is incomplete. But your complete question probably was:

Prediction 1 :Two hummingbirds with short or medium beaks had a baby with a mutation in its genes for the long-beak trait.

Prediction 2 is best. A hummingbird could have been born with a mutation in its genes for the long-beak trait and lived for a little while.

Based on its solubility in hexane, C₆H₁₄. Then the order of these compounds is C₃H₈ → CH₃OH → H₂O

Non-polar compounds are compounds that are formed due to the existence of a bond between electrons in the elements that form them. This happens because the bonding elements have the same or nearly the same electronegativity value.

Polar compounds have a high dipole moment, while nonpolar compounds do not have a dipole moment. This difference causes the two solutions to not bond.

Hexane is non-polar.

So, C₃H₈ is the easiest to dissolve because C₃H₈ is also non-polar.

H₂O is more polar than CH₃OH. So, CH₃OH will dissolve more easily than air. air will at least dissolve.

So that the order based on its solubility with hexane is C₃H₈, CH3OH, H₂O.

Your question may incomplete, for complete questions it's in the picture.

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The claim that sense neurons' cell bodies are located in the grey commissure, an expanded region of the dorsal root.

Dorsal nerve roots provide sensory neural signals to the central nervous system from the peripheral nervous system. Anatomically, a dorsal root ganglion develops from the dorsal root of the spinal nerves. For the central nervous system to react, they transmit sensory data from multiple peripheral receptors. It is generally recognised that DRG has a role in chronic pain. The first description of anaesthesia infiltration of the DRG was made in 1949. It has been possible to target the DRG using the dorsal root entry zone (DREZ), a nearby related neural target, dorsal rhizotomy or gangliectomy, conventional radiofrequency denervation, pulsed radiofrequency, and steroid injection.

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Answer:

C Two

Explanation:

no of proton = no of electron

In the activity series, the more active elements are found at the bottom and at the top. Option d.

The activity series is a way of organizing elements according to their reactivity.

The elements found at the bottom of the series are the most active, and those found at the top are the least active.

Knowing the activity series can help us predict how a reaction will proceed, and can be a useful tool when determining which compounds are most likely to form in a given reaction.

The elements at the bottom of the activity series are the most active, and the elements at the top are the least active. Knowing the activity of elements can help you understand the chemical properties of different materials and how they may interact with each other.

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Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals.

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