It is dangerous to combine alcohol and other drugs because _________________.

A one world factor to describe the benefits and limitations of Bromine are water purification compound.

Explanation:

Benefits of bromine

Limitations of bromine

Answer:

1.133 moles of chromium (lll) nitrate are produced.

Explanation:

[tex]4Cr+3Pb(NO_3)_4\rightarrow 4Cr(NO_3)_3+3Pb[/tex]

Moles of lead(IV) nitrate = 0.85 mole

According to recation, 3 moles of lead(IV) nitrate gives 4 moles of chromium (III) nitrate.

Then 0.85 moles of lead(IV) nitrate will give:

[tex]\frac{4}{3}\times 0.85 mol=1.133 mol[/tex] of chromium (lll) nitrate.

1.133 moles of chromium (lll) nitrate are produced.

Answer:

Explanation:

The high temperature refrigerant passes into a condenser coil. As the vapor refrigerant travels through the coil, air from a fan passes over the coil to cool the vapor refrigerant. As the vapor cools it condenses and becomes a liquid, which is referred to as a change of state.

Answer: 94.07%

Explanation:

Percentage yield can be calculated by the formula

%yield = Experimental yield/Theoretical yield x100

Experimental yield = 7.93g

Theoretical yield = 8.43

%yield = Experimental yield/Theoretical yield x100

%yield = 7.93/8.43 x 100 = 94.07%

Answer:

The nucleus of a sulfur atom contains 16 protons.

The nucleus of a chlorine atom contains 17 protons.

Explanation:

Atoms are arranged in the Periodic Table according to the number of protons in their nuclei — their atomic numbers.

A proton is an integral particle —  you can't have half a proton.

S and Cl are adjacent in the Periodic Table, so it is impossible to find an element that will fit between them.

Answer:

the second one I think

Explanation:

hope you get it correct!

Answer:

a

Explanation:

Tissue engineering is beneficial as stem cells automatically create a perfect organ shape and size, therefore, here option C is correct.

Tissue engineering is a biomedical engineering discipline that coordinates science with engineering  to make tissues or cell items outside the body or to utilize acquired information to more readily deal with the maintenance of tissues inside the body.

Numerous new cell treatments are being fostered that make difficulties for designing tissue capability.

The execution of cell treatments and unions in the facility requires the acknowledgment and goal of a few troublesome issues.

Tissue engineering is beneficial as, stem cells automatically create a perfect organ shape and size, hence option C is correct.

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Answer: If you were asking for it to be balanced then its 10 C7H602 + 70 O2 = 70 CO2 + 301 H20

Explanation: i hope this helped you

Answer:

The equation of state of n gram-moles of a perfect gas can then be written as pv/t = nR, in which R is called the universal gas constant.

Explanation:

Answer:

PV=nRT

Explanation:

To attain stability the chemical bond is formed .

Chemical bond

It is a kind of linkage that binds one atom with the other .

The atoms do so in order to attain stable noble gas configuration .

To form chemical bond they either:

Loose electrons : when atoms loose electrons they acquire positive charge which is equal to the number of electrons lost .

Gain electrons: After gaining electrons they acquire negative charge which is equal to the number of electrons gained by an atom.

share electrons : With sharing no charges are develop .

In the above asked question when iron combines with oxygen it forms iron oxide : where iron looses 3 electrons and oxygen gains 2 electrons .That is the reason ,III here represents  the electrical charge of iron

Answer:

there are certain spiders with some pretty weird/ cool self defense techniques

Answer:

Therefore the coins were of yellow brass.

Explanation:

A sample weighted 129.6 g and had a volume of 15.3 cm³.

[tex]Density =\frac{mass }{volume}[/tex]

Here mass= 129.6 g and volume =15.3 cm³.

[tex]Density =\frac{129.6}{15.3}[/tex] g/cm³

             =8.47 g/cm³

Given that the density of gold = 19.3 g/cm³

and density of yellow brass = 8.47 g/cm³

Since the density of the sample is equal to the density of yellow brass.

Therefore the coins were of yellow brass.

The density of the coins sampled is 8.47 g/cm3, which is the same as the density of brass and much less than the density of gold, 19.3 g/cm3. The coins are therefore made of brass not gold.

To determine if the coins are gold or brass, you need to calculate the density of the sample and compare it to the known densities of gold and brass. The density can be calculated by dividing the mass by the volume.

So, density = mass/volume = 129.6 g / 15.3 cm3 = 8.47 g/cm^3.

The density of the sample is identical to the density of brass, 8.47 g/cm^3, and much less than the density of gold, 19.3 g/cm3. Therefore, the coins are made of brass not gold.

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Answer:

a compound

Explanation:

A substance composed of two or more pure substances mixed together in variable proportions, with variable composition throughout, is called a heterogeneous mixture. These mixtures can have components that retain their individual chemical identities, which can often be physically separated.

When two or more pure substances are mixed together in variable proportions, without any chemical bonding between them, the resulting substance is known as a mixture. These mixtures where the composition is not consistent throughout are called heterogeneous mixtures. Examples include sand and water, or oil and water. Unlike a compound, where elements are in fixed proportions and chemically bonded, the substances in a mixture retain their individual chemical properties and can often be physically separated.

Mixtures stand in contrast to compounds, which are substances composed of two or more elements in fixed proportions and can only be separated into their constituent elements by chemical methods.

The concept of composition variables, such as the number of moles of each component, is crucial for describing the properties of mixtures. Air, with its variable amounts of nitrogen and oxygen, is an example of a mixture with each component retaining its characteristic properties.

Answer:

$55.998

Explanation:

Given data:

Total yard in blanket = 1531 yard

Price of  2.00×10² m = $7.99

Total cost for blanket = ?

Solution:

As it is given in question that,

1 yard = 0.9144 m

1531 × 0.9144 m  = 1399.95 m

Total number of meters = 1399.95 m

Price of 2.00×10²(200) m = $7.99

Cost of one meter:

$7.99 / 200m = 1 m / x

x = $0.04

Now we will calculate the price of 1531 yard,

1399.95 m ×  $0.04 / 1m = $55.998

To make the blanket requiring 1531 yards of yarn using a speciality yarn sold in 200 meter hanks priced at $7.99 each, it would cost $55.93 after converting yards to meters and calculating the number of hanks needed.

The cost of making a blanket using the given yarn, we need to convert the required yarn from yards to meters to match the unit in which the speciality yarn is sold. Then, we can determine how many hanks of yarn are needed and calculate the total cost.

Conversion of Yards to Meters

Firstly, we convert the needed yarn for the blanket from yards to meters using the conversion factor 1 yard = 0.9144 meters.
1531 yards * 0.9144 meters/yard = 1400.0844 meters

Calculating the Number of Hanks Needed

Now, we calculate how many 2.00 x 102 meter hanks are required:

1400.0844 meters / (2.00 x 102 meters/hank) = 7 hanks (rounding up since you can't purchase a fraction of a hank)

Total Cost Calculation

Finally, the total cost is:

7 hanks * $7.99/hank = $55.93

Therefore, it would cost $55.93 to make the blanket out of this speciality yarn.

Explanation:

There are some properties to demonstrate that this was a chemical change and not a physical change

Answer:

Solid; denser

Explanation:

Explanation:

Both new moon and lunar eclipse occur when the moon is in the same plane the sun and the earth. However, both are different because of the relative position of the moon in its orbit – relative to earth. In a new moon, the moon is in between the earth and the sun, while in a lunar eclipse, the earth us in between the moon and the sun.

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Answer:

A new moon and lunar eclipse occur when the moon is in the same plane as the earth and the sun. The moon is between the earth and the sun on a new moon. The earth is between the moon and the sun on a lunar eclipse.

Explanation:

The crust below the ocean and ocean floor is thinner than the crust below the Earth's continents.

Answer:

it is filled with basalt

Explanation:

Au₂S₃

Explanation:

Given compounds:

Gold(I) oxide = Au₂O

Gold(I)sulfide  = Au₂S

Gold(III) oxide = Au₂O₃

Gold(III)sulfide = Au₂S₃

Problem: compound with the least mass of Gold.

  To solve this problem, we simply find the mass percentage of gold in the given compounds.

Molar mass of Au₂O = 2(197) + 16  = 410g/mole

Molar mass of Au₂S = 2(197) + 32  = 426g/mole

Molar mass of Au₂O₃ = 2(197) + 3(16) = 442g/mole

Molar mass of Au₂S₃ = 2(197) + 3(32) = 490g/mole

The molar mass of gold in all the compound is 394g/mole

Mass percentage of gold in Au₂O  = [tex]\frac{394}{410}[/tex]  x  100 = 96.1%

Mass percentage of gold in Au₂S = [tex]\frac{394}{426}[/tex] x  100 = 92.5%

Mass percentage of gold in Au₂O₃ = [tex]\frac{394}{442}[/tex] x 100 = 89.1%

Mass percentage of gold in  Au₂S₃ = [tex]\frac{394}{490}[/tex] x 100 = 80.4%

Au₂S₃ is the least mass of gold in it

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Answer:

Explanation:

Given compounds:

Gold(I) oxide = Au₂O

Gold(I)sulfide  = Au₂S

Gold(III) oxide = Au₂O₃

Gold(III)sulfide = Au₂S₃

Problem: compound with the least mass of Gold.

 To solve this problem, we simply find the mass percentage of gold in the given compounds.

Molar mass of Au₂O = 2(197) + 16  = 410g/mole

Molar mass of Au₂S = 2(197) + 32  = 426g/mole

Molar mass of Au₂O₃ = 2(197) + 3(16) = 442g/mole

Molar mass of Au₂S₃ = 2(197) + 3(32) = 490g/mole

The molar mass of gold in all the compound is 394g/mole

Mass percentage of gold in Au₂O  =   x  100 = 96.1%

Mass percentage of gold in Au₂S =  x  100 = 92.5%

Mass percentage of gold in Au₂O₃ =  x 100 = 89.1%

Mass percentage of gold in  Au₂S₃ =  x 100 = 80.4%

Au₂S₃ is the least mass of gold in it

The number of reactants is the same as the number of products is the best statement that describes the conservation of mass in chemical equation

Explanation:

Answer:

Acetic acid ([tex]CH_{3}COOH[/tex]) can release only one single H+ ion .

Therefore we can say that acetic acid has only one pKa value.

Amino acids have one -COOH( carboxylic group) group and one -NH​​​​​​2​ (amino group) group which can both release one single H+ ion.

Explanation:

Acetic acid ([tex]CH_{3}COOH[/tex]) can release only one single H+ ion .

Therefore we can say that acetic acid has only one pKa value.

Amino acids have one -COOH( carboxylic group) group and one -NH​​​​​​2​ (amino group) group which can both release one single H+ ion.

In amino acids  -[tex]NH_{2}[/tex] group becomes [tex]-NH_{3}^{+}[/tex] in the presence of acids.

in the presence of bases  [tex]-COOH[/tex] becomes [tex]-COO^{-}[/tex]

Therefore two pKa values can be observed amino acids.

Final answer:

Acetic acid has only one pKa value because it is a monoprotic acid with a single proton to donate, creating one acid dissociation constant. Amino acids have at least two ionizable groups (amino and carboxyl groups), each capable of donating a proton under different conditions, resulting in two distinct pKa values for amino acids.

Explanation:

The question asks: Why does acetic acid have only one pKa value and our amino acids have two? Acetic acid, which is a monoprotic weak acid, contains only a single acidic proton. As such, it can donate only one proton to the solution, leading to a single acid dissociation constant or pKa value. This is contrasted with amino acids, which generally possess at least two ionizable groups (the amino group and the carboxyl group). Each of these groups can donate a proton under different pH conditions, resulting in two distinct pKa values. The differences in pKa values are influenced by the structure of the ionizable group and its relative ability to stabilize the resulting conjugate base. For example, the carboxyl group of an amino acid has a pKa around 2, reflecting its readiness to donate a proton and form a carboxylate anion, which is stabilized through resonance. The amino group typically has a pKa around 9, indicating its ability to accept a proton and form an ammonium ion. The microenvironment surrounding these ionizable groups, especially in proteins, can further affect their pKa values, leading to a variability depending on factors such as whether the amino acid is exposed to solvent or buried within a protein structure.

Answer: B

.

Explanation:

Answer:

A - Because the model makes concepts easier to understand.

Explanation:

A visual representation can be a great help in figuring something out. Besides, the other answers don't make much sense.

Hope this helps! (and sorry it's late ^^'' )

Explanation:

Boiling point

It is the temperature at which liquid changes into gaseous state .

or it can be defined as :

the temperature at which the vapor pressure of a liquid becomes  equals to  atmospheric pressure .

It depends upon many factors :

Temperature : more is the temperature , more is the vapor pressure hence more is the boiling point .

Pressure : More is the pressure , ore is the boiling point or vice versa .

Intermolecular forces in particles of matter : more are the forces , less is the boiling point as they will have no escaping tendency .

The boiling point of water is : 100 degree celsius

Answer:

1. Viscosity describes how "thick" a liquid is. This is based on its resistance to flow. Viscosity is measured in 'poise' (written P)

2. Fluids can be described as having great, or little viscosity.

3. Tar, Glycerol, Sulfric Acids

4. Mercury, Blood, Dilute polyethylene oxides

(Can't answer #5-9 because I don't know what lab you are doing.)

The term mole concept is used here to determine the number of hydrogen atoms in one mole. The number of 'H' atoms in one mole is 6.022 x 10²³ atoms. The correct option is D.

One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12. The number of entities present in one mole of a species equals 6.022 x 10²³ . This value is called the Avogadro number.

The Avogadro number also called the Avogadro constant. It is represented as N₀. One gram atomic mass of any element contains Avogadro number of atoms. The number of atoms in 12 g of C-12 is also 6.022 x 10²³.

1 gram atom of hydrogen (i.e., 1.008 g) contains Avogadro number of atoms.

Thus the correct option is D.

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Final answer:

One mole of any substance contains Avogadro's number of particles. Hence, 1 mole of hydrogen atoms contains 6.02 x 10^23 atoms.

Explanation:

The question asks to calculate the number of hydrogen atoms in 1 mole. Avogadro's number, defined as the number of particles in 1 mole of a substance, is 6.022 x 1023 particles/mole. This principle is based on the standard that 1 mole of carbon-12 atoms has a mass of exactly 12.0 grams and contains 6.022 x 1023 carbon atoms. Given that 1 mole of any substance contains the same number of entities as there are in 1 mole of carbon-12, one mole of hydrogen atoms, regardless of its lesser mass compared to carbon-12, also contains exactly 6.022 x 1023 atoms. Therefore, the correct answer is D) 6.02 x 1023 atoms.

Final answer:

Antacid tablets neutralizing stomach acid represents a chemical property, as it describes the substance's ability to undergo a chemical change and form different substances.

Explanation:

The statement among the given options that describes a chemical property is 'Antacid tablet’s neutralize stomach acid.' This statement describes the ability of a substance to undergo a specific chemical change. A chemical property involves a substance's ability to convert into a different substance, which is what antacid tablets do when they interact with stomach acid to produce salt and water, neutralizing the acid.

In contrast, the other statements describe physical properties: Iodine sublimating from a solid to a gas is a physical change because it changes state but does not become a new substance; helium being the lightest monatomic element describes its physical characteristic; and water freezing at 0°C is a physical change because it changes the state from liquid to solid without altering the chemical composition.

Answer:

Electric engines have efficiencies of roughly 90% whilst combustion engines about 10% to 30%. This is because combustion engines emit much more heat, which is always energy that is not used as work, and thus increases inefficiency.

Explanation: