The atomic mass of gallium is 69.72 . The density of iron is 7.87 . The atomic mass of iron is 55.847 . Calculate the number of gallium atoms in one ton (2000 pounds) of gallium. (Enter your answer to three significant figures.)

Considering how the body is organized, give one reason  the reason it is difficult for scientists to build a heart is D: The heart is made up of many different types of cells that are organized into different tissues.

Tissues: A collection of cells that work as a single unit and have a similar structure are referred to as tissues. The body's tissues give it form and aid in energy storage and heat retention. Connective tissue, epithelial tissue, muscle tissue, and nervous tissue are the four different types of tissues.

muscular tissue, connective tissue, epithelial tissue, and nerve tissue. Other tissues are held together and supported by connective tissue (bone, blood, and lymph tissues). A coating is provided by epithelial tissue (skin, the linings of the various passages inside the body).

Therefore, option D

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The movement of airborne particles is caused by every vibrating item. This motion, which lasts until the particle runs out of power, produces sound waves.

The development of children includes sound from the time they are born. White noise, lullabies, and the voices of their parents are soothing to infants, and as they get older, other sounds aid in their connection and learning.

Plasma molecules of a air surrounding an item vibrate as a result. Nearby molecules that come into contact with these molecules vibrate as a result. They consequently run across additional air molecules in the area.

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The correct question is

Explain the importance of sound in our daily life .

Answer:

D. 4

Explanation:

Answer and Explanation: Carbon can form a maximum of four covalent bonds. Carbon can share up to four pairs of electrons, therefore, the carbon atom fills its outer energy level and achieves chemical stability.

Explanation:

in fact , we can use newtons second law of motion (see the SPT: Force topic) to calculate the acceleration in each of these cases

in fact , we can use newtons second law of motion (see the SPT: Force topic) to calculate the acceleration in each of these caseshope it helps you like me plz

Answer:

6

Explanation:

fpufjpufuodhodoyhupupddupud

Answer:

The goal is to improve the way which we live,to make our lives easier by reducing paper work.It is important because technology helps keep our information safe.

Answer:

Explanation:

The reaction between 2 chloro- 2 methyl pentane and sodium iodide takes place through SN2 mechanism . iodide ion is the nucleophile which attacks the substrate . The rate of such reaction depends upon concentration of both the nucleophile and the substrate .

Hence rate of reaction will be increased by 2 x 2 = 4 times.

option D ) is correct.

Explanation:

The given reaction represents the reaction between a tertiary alkyl halide that is 2-chloro-2-methylpentane and a nucleophile that is NaI.

This reaction favors SN1 mechanism which has order one.

So, the given reaction follows first-order kinetics.

For a first-order reaction, the rate law is:

rate =k [A]

That means the rate of the reaction is dependent on the concentration of reactants.

So, when the concentration of the reactant is doubled then, the rate of the reaction is also doubled.

Among the given options the correct answer is option B) It would double the rate.

The atomic mass of element A, given that the first isotope has abundance of 18.18% and a mass of 147.99, is 131.43 amu

From the question given above, the following data were obtained:

The atomic mass of the element A can be obtain as illustrated below:

Atomic mass = [(Mass of 1st × 1st%) / 100] + [(Mass of 2nd × 2nd%) / 100]

Inputting the given parameters, we have:

Atomic mass = [(147.99 × 18.18) / 100] + [(127.76 × 81.82) / 100]

Atomic mass = 26.90 + 104.53

Atomic mass = 131.43 amu

Thus, the atomic mass of element A obtained from the above calaculation is 131.43 amu

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According to the law of conservation of Mass:

In a chemical reaction mass can neither be created nor be destroyed

So, we can say that: Mass of A + Mass of B = Mass of C

In the given reaction,

One of the reactants weigh 5 grams and another one weighs x grams

The mass of the product of this reaction is 9 grams

Mass of reactant B:

Mass of A + Mass of B = Mass of C

5 + x = 9

x = 4 grams

Answer:

the first one: condense

the second one: evaporate  

Explanation:

onclude about the trends in the solubilities of the compounds of the alkaline earth metals

The solubility or, as we can say, the activity of the chemical, increases as one moves down the group. Since barium is more active

Chemical element barium (Ba), an alkaline-earth metal belonging to Group 2 (IIa) of the periodic chart. The substance is utilized in metallurgy, and pyrotechnics, petroleum production, and radiology all make use of its constituents.What is the purpose of barium?

Barium is solely utilized for GI tract imaging tests. An upper GI series may include a barium swallow test in addition to or instead of it. In this series, the esophagus, stomach, and first segment of the small intestine are examined (duodenum). During a barium swallow test, fluoroscopy is frequently employed.

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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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A change in temperature such as freezing point depression or boiling point elevation depends on three variables:

ΔT = k*m*i

ΔT is the change in temperature;

k is a constant that depends on the solvent;

and i depends on the number of particles that an ionic solute dissolves into

With this information, let's analyze each of the options, considering their dissolution in water:

CH3OH is not ionic, so we do not consider any dissociation.

And finally,

To know which will cause the least temperature change, we only count how many ions the compounds dissociate into.

However, the question is which will cause the least change, therefore it is the one that didn't have an ionic dissociation. CH3OH is the substance that will cause the least temperature change.

Answer:

To show that the data are in accord with the law of multiple proportions, we need to determine the ratios of the masses of to in each compound and see if they are in small whole number ratios.

For the first compound:

Mass of : 23.3 g

Mass of : 3.00 g

Ratio of masses: 23.3 g / 3.00 g = 7.77

For the second compound:

Mass of : 7.00 g

Mass of : 4.50 g

Ratio of masses: 7.00 g / 4.50 g = 1.56

These ratios are not in small whole number ratios, which indicates that the formula for the first compound cannot be determined by simple inspection. However, the fact that the ratios are different is in accord with the law of multiple proportions, which states that when two elements form more than one compound, the masses of one element that combine with a fixed mass of the other element are in small whole number ratios.

Let's assume that the formula for the second compound is . This means that the ratio of to in the compound is 2:1. From the data provided, we know that there are 4.50 g of in the compound, which means there must be twice as much in the compound. Therefore, there are 9.00 g of in the compound.

To determine the formula of the first compound, we can subtract the mass of from the total mass of the compound:

Mass of : 23.3 g

Mass of : 3.00 g

Total mass: 26.3 g

Mass of : 26.3 g - 3.00 g = 23.3 g

So the ratio of to in the first compound is:

Mass of : 23.3 g

Mass of : 3.00 g

Ratio of masses: 23.3 g / 3.00 g = 7.77

We can divide this ratio by the ratio of to in the second compound to get the ratio of the two compounds:

Ratio of first compound: 7.77

Ratio of second compound: 2.00

The ratio of the two compounds is not a small whole number ratio, which suggests that the formula for the first compound is more complex than a simple binary compound. Therefore, we cannot determine the formula of the first compound from the data provided.

Answer:

the formula of the first compound is A2.08B0.78, which we can simplify to A2B.

Explanation:

To determine if these data are in accord with the law of multiple proportions, we need to compare the ratios of the masses of one element to the fixed mass of the other element in each compound:

For the first compound:

mass ratio of A:B = 23.3 g / 3.00 g = 7.77

For the second compound:

mass ratio of A:B = 7.00 g / 4.50 g = 1.56

If the ratios of the masses of one element to the fixed mass of the other element are simple whole number ratios, then the data are in accordance with the law of multiple proportions. We can see that the ratios calculated above are not simple whole numbers, so the law of multiple proportions does not appear to be satisfied.

To determine the formula of the first compound, we can assume that the formula is AxBy, where x and y are the subscripts that we need to determine. We can set up a system of equations based on the mass ratios:

23.3 g of A combines with 3.00 g of B:

(23.3 g A) / (x mol A) = (3.00 g B) / (y mol B)

7.77 mol A / mol B = (23.3 g A) / (3.00 g B)

7.77 (y/x) = 23.3 / 3.00

y/x = 3/7.77

7.77 g of A combines with 1.00 g of B:

(7.77 g A) / (x mol A) = (1.00 g B) / (y mol B)

1.56 mol A / mol B = (7.77 g A) / (1.00 g B)

1.56 (y/x) = 7.77 / 1.00

y/x = 5/2

Now we have two equations for y/x that we can solve simultaneously:

y/x = 3/7.77

y/x = 5/2

Setting these two expressions equal to each other, we get:

3/7.77 = 5/2x

x = 2.08

Now that we know x, we can use one of the equations for y/x to solve for y:

y/x = 3/7.77

y/2.08 = 3/7.77

y = 0.78

Therefore, the formula of the first compound is A2.08B0.78, which we can simplify to A2B.

Answer:

Ionic

Explanation:

The false statement about the gas expansion process is "∆S(system)=0".

When the gas expands into the vacuum, it undergoes an irreversible process. The gas molecules move from a region of high concentration to a region of low concentration, and as a result, there is an increase in entropy (∆S) of the gas.

According to the Second Law of Thermodynamics, the entropy of an isolated system will always increase for an irreversible process. Therefore, the entropy of the system, in this case, the gas, increases as it expands into the vacuum. The false statement about the gas expansion process is "∆S(system)=0". The other statements are true for this process. Since there is no temperature difference between the gas and the surroundings, the change in temperature is zero (∆T=0). The change in internal energy (∆E) is also zero since the gas is expanding against no external pressure. Finally, since there is no heat transfer between the system and the surroundings, the work done (∆PE + ∆KE) is equal to the heat transfer (w = q).

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Answer: If a neutral atom gains electrons, then it will become negatively charged

Explanation: If a neutral atom gains electrons, then it will become negatively charged. If a neutral atom loses electrons, then it become positively charged.

Answer:

heat energy

Explanation:

Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.

Answer:

i think its A

Answer:

C

Explanation: I mL = 1 cm3 and 1 L = 1000 mL so 1 L - 1000 cm3

Answer:

d

Explanation:

Answer:

You see the concentration decreased ten fold, from 1 M to 0.1 M.

You can simply increase the volume by ten times.

For example

If you have 250 mL of 1 molar HCl, you can add distilled water upto 2500 mL. Now the concentration is 0.1 molar.

If you want to use the serial dilution method, you can use the C1V1=C2V2 equation.

C1 = starting concentration.

C2 = final concentration.

V is for volume.

So let's say you have 500 mL of 1 M HCl and you only want 50 mL of 0.1 M HCl.

1 M x V1 = 0.1 M x 50 mL

V1 = 5 mL

So you take 5 mL of the original (stock) solution and dilute it up to 50 mL. Then you have 50 mL of 0.1 M HCl.

Explanation:

Answer: Under what condition an object having density greater than water will float on water?

If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Density is a characteristic property of a substance and doesn't depend on the amount of substance.

The concentration of the solution reduces and the number of moles of solute isn't affected.

Data;

1. When the solution is diluted, the concentration changes and this time, the concentration reduces.

Using dilution formula

\(c_1 v_1 = c_2 v_2\\12 * 50 = c_2 * 200\\c_2 = \frac{600}{200} \\c_2 = 3M\)

The concentration of the solution reduces.

2. The number of moles remains the same.

When a solution is diluted, the number of moles remains the same because there's no change in the mass of the solute.

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12.0 grams of \(Pb(NO_3)_2\) would produce 10.1 grams of \(PbCl_2\) precipitate .

To determine the number of moles of lead(II) chloride (\(PbCl_2\)) precipitate that could be produced from reacting 12.0 grams of lead(II) nitrate (\(Pb(NO_3)_2\)), we need to first write and balance the chemical equation for the reaction between these two compounds:

\(Pb(NO_3)_2 (aq) + 2NaCl (aq) = PbCl_2 (s) + 2NaNO_3 (aq)\)

From the balanced equation, we can see that one mole of \(Pb(NO_3)_2\) reacts with 2 moles of NaCl to produce one mole of \(PbCl_2\).

The molar mass of \(Pb(NO_3)_2\) is:

207.2 g/mol (Pb) + 2(14.0 g/mol) + 6(16.0 g/mol) = 331.2 g/mol

To determine the number of moles of \(Pb(NO_3)_2\) present in 12.0 grams of the compound, we can use the following formula:

moles = mass/molar mass

moles of \(Pb(NO_3)_2\) = 12.0 g / 331.2 g/mol = 0.0362 mol

From the balanced equation, we know that 1 mole of \(Pb(NO_3)_2\) reacts to produce 1 mole of \(PbCl_2\). Therefore, 0.0362 moles of \(Pb(NO_3)_2\) will produce 0.0362 moles of \(PbCl_2\)

The molar mass of \(PbCl_2\) is:

207.2 g/mol (Pb) + 2(35.5 g/mol) = 278.7 g/mol

Therefore, the mass of \(PbCl_2\) that could be produced is:

mass = moles x molar mass = 0.0362 mol x 278.7 g/mol = 10.1 g

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Answer:

Even all compounds are neutral.

Explanation:

Some of them exhibit polarity. Because of the difference in electron affinity of the constituent atoms, the shared electrons are pulled towards the atom with high affinity to electrons.

The feet is a standard unit of measurement. It is mainly used to measure the length of a particular object. Here 12 mi is 63,360 feet. The correct option is B.

The unit of measurement which is generally used to measure height, length and distance is defined as the feet. The foot is the singular form of feet. It is a non-metric measure unlike meters and centimeters which are metric.

Here 1 mi = 5280 ft

Then,

12 mi = 12 ×  5280

= 63,360 feet

Thus the correct option is B.

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Answer:

Explanation: Liquid Chromatography  

I'm sorry if i'm wrong

The student paid an interest of $3,000 over the next five years.

HOW TO CALCULATE INTEREST:

The interest on a borrowed amount of money can be calculated by subtracting the principal from the amount paid over time. That is;

Interest = principal - amount

According to this question, a student borrows $10,000 from a bank but ends up paying $13,000. This means that the principal is $10,000 while the amount is $13,000. The interest is calculated thus;

Interest = $13,000 - $10,000

Interest = $3,000

Therefore, the student paid an interest of $3,000 over the next five years.

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