-1.42, 3, 32.5%, √4, 2³, −0.375, 3/8 as a decimal least to greatest

2.5 km is the distance you can travel if a car gets 14 kilometers per liter and have 35 liters of gas.

Total distance traveled in 1 liter = 14 km

Total gas in the car = 35 liters

We have to find how much distance can be covered in in35 liters of gas.

Distance is the length of the path traveled between two points. It is the total movement of an object in a direction. It measures length.

Distance = 35/14

Or, distance = 2.5 km

Therefore, the total distance that can be covered by a car in 35 liters of gas is 2.5 km.

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Before to exposed to heat stearic acid is a colorless solid, which gets converted to a clear liquid under the influence of heat.

Stearic acid is a colorless or white, waxy solid, which slightly dissolves in water but is soluble in oil, Stearic Acid is a fatty acid due to the presence of an 18-carbon chain, it also knows as Octadecanoic Acid. When the stearic acid is exposed to heat it gets converted to a clear liquid which was supposed to be a white solid in nature.As we know that the law of conservation of matter defines that matter is conserved,  the matter can change form through chemical and physical changes, but the amount of matter before the changes remains the same, which means it can't be destroyed or created.

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Correct metal is aluminum

Martina has a sample of an unknown substance she measures the substance. its mass is 13.5 grams, and its volume is 5 cm³ so here density concept is seen.

Density = mass/volume

So 13.5/5 = 2.7

This density is same as aluminum that's why this metal is aluminum.

Aluminum is a chemical element with the symbol Al and atomic number 13  aluminum is a silvery-white, lightweight metal. It is soft and malleable. aluminum is used in a huge variety of products including cans, foils, kitchen utensils.

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Answer:Aluminum

Explanation:

While burning iron shavings results in a chemical change, the formation of little particles of iron shavings is a physical change.

Small bits of iron shavings being formed are an example of a physical change because they can be transformed back into nails, whereas small pieces of iron shavings being burned on a flame are an example of a chemical change since they cannot be transformed back into their original shape. Chemical change is a change in matter that modifies the chemical properties of the substance as opposed to physical change, which modifies the matter's physical characteristics.

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Suppose we heat a 4. 31 g sample of a Na2Co3 hydrate. after thorough heating, the mass of the compound is 3. 22 g based on the data, Na₂CO₃ • 2H₂O for the hydrate we start with this formula.

Here compound are Na₂Co₃ then mass of compound is 3.22g and molar mass is 105.98g/mol

Moles of compound (anhydrate Na₂CO₃) = mass / molar mass = 3.22 g / 105.98 g mol = 0.0304 mol mass

So here compound Na₂Co₃ are given and we start with formula Na₂CO₃ • 2H₂O  for the hydrate.

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The hydrogens and oxygen of a water molecule are held together by covalent bonds.

A covalent bond is an electron exchange that causes the production of electron pairs between atoms. Covalent bonding is a stable equilibrium of the attractive and repulsive forces between two atoms that occurs when they share electrons.

Bonding pairs or sharing pairs are other names for these electron pairs. Because electrons are shared among several molecules, each atom can reach the equivalent of a full valence shell, resulting in a stable electronic state.

In organic chemistry, covalent bonds are much more common than ionic bonds. Covalent bonds unite the atoms in a single water molecule, whereas hydrogen bonds join two water molecules. Water develops a covalent bond when oxygen shares an electron with each hydrogen atom.

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A hydrate of cobalt(II) chloride had a mass of 238.0 g before heating. After heating, the anhydrous CoC1, weighed 130.7 g.

from above statement, we found that,

before heating cobalt(II) chloride  = 238.0g

Mass of hydrated  cobalt(II) chloride After heating = 130.7 g

Mass of water = (1238.0 - 130.7) g = 107.39g

moles H2O  = 107.39× 1 mole H2O÷18g H2O

= 5.96 mol H2O.

moles of anhydrous CoCl, remain = given mass of CoCl÷ molar mass of CoCl

=130÷94.5

= 1.375 mole

moles of CoCl₂ = given mass of  CoCl₂÷ molar mass of CoCl₂

= 130÷ 130

= 1 mole.

hydration number = moles of water÷ mole of compound

= 5.96 mol÷ 1

 = 5.96 hydration number

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108.81 grams of phosphorus are present in 3.51 moles of phosphorus trichloride, PCl₃.  

The molecular formula of Phosphorus trichloride is PCl₃.

One mole of phosphorus trichloride contains one mole of phosphorus element.

The molar mass of phosphorus = 31 g.

So,

1 mole of phosphorus trichloride contains 31 g of phosphorus

Since,

1 mole PCl₃ has 31 g Phosphorus

1 × 3.51 moles PCl₃ has 31×3.51 g Phosphorus

3.51 moles PCl₃ has 108.81 g of Phosphorus

Hence,

3.51 moles of phosphorus trichloride have 108.81 grams of phosphorus present in it.

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Eight atoms of carbon react with 18 atoms of hydrogen , forming only one molecule of [tex]C_{8} H_{18[/tex] is considered as violation of the law of conservation of mass .

According to the law of mass conservation , neither chemical processes nor physical changes can create or destroy mass in an isolated system . The mass of the products and reactants of a chemical reaction must be equal, in accordance with the law of conservation of mass .

The reaction occur when eight atoms of carbon react with 18 atoms of hydrogen , forming only one molecule of [tex]C_{8} H_{18[/tex] is given as .

8C +18[tex]H_{2}[/tex] → [tex]C_{8} H_{18[/tex]

Mass of reactants = 8 × 12 + 18 × 2 = 132 g

Mass of reactants = 8 × 12 + 18  = 114 g

So , mass of reactant is not equal to the mass of product .

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The appropriate designation for an ion with 24 protons, 27 neutrons, and 21 electrons is [^51 Cr24].

How to represent an atom with atomic number and mass?

The smallest component of ordinary stuff that makes up a chemical element is an atom. Each neutral or ionized atom makes up a solid, liquid, gas, or type of plasma. Atoms are very small, with an average diameter of 100 picometers.

Symbolical representation is :

            [ Xz^A] or  [^A Xz]

Where,

A = Mass , X = atom, Z = Atomic number.

The quantity of protons and neutrons in an atom's nucleus is referred to as its mass number.

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The pressure reading increases.

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit vicinity over which that pressure is distributed. Gauge stress (also spelled gage pressure)[a] is the stress relative to the ambient pressure.

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Answer:

Explanation:

O2

The Ag[tex]_{2}[/tex]CO[tex]_{3}[/tex]   is formed when 25.0 ml of 0.200M AgNO[tex]_{3}[/tex] is mixed with 50.0 ml of 0.800 M Na[tex]_{2}[/tex]CO[tex]_{3}[/tex] is 0.68 g.

According the question , the chemical equation is give by :

2AgNO[tex]_{3}[/tex]   +   Na[tex]_{2}[/tex]CO[tex]_{3}[/tex]  ------->   Ag[tex]_{2}[/tex]CO[tex]_{3}[/tex]     +      2NaNO[tex]_{3}[/tex]

Given that :

volume of silver nitrate = 25.0 ml or 0.025 L

molarity M =  0.200 M

volume of sodium carbonate = 50.0 ml or 0.050 L

molarity = 0.800 M

now, no. of moles of silver nitrate  =  0.025 × 0.200 = 0.005 moles

no. of mole of sodium carbonate = 0.050 × 0.800 =  0.04 moles

the no. of moles of silver carbonate ,  =  0.5 × 0.005

                                                                =  0.0025 moles

molar mass  of Ag[tex]_{2}[/tex]CO[tex]_{3}[/tex] = 275.7 g/mol

therefor, the mass of Ag[tex]_{2}[/tex]CO[tex]_{3}[/tex] =   0.0025 moles × 275.7 g/mol

                                                 =0.68 g

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The reduction of a molecule can sometimes result in the acquisition of a proton, a reaction referred to as hydrogenation.

What is hydrogenation?

Molecular hydrogen (H2) and another substance or element undergo a chemical reaction known as hydrogenation, typically in the presence of a catalyst such as nickel, palladium, or platinum. The method is frequently used to saturate or decrease organic molecules.

To turn an oil that is liquid into a solid fat. Hydrogenation, sometimes in conjunction with other procedures like interesterification or fractionation, may offer a technique to manufacture the needed fat when solid fats of the proper consistency are expensive or unavailable.

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Answer:

When a liquid is remained a liquid the the particles are loose but as the liquid turns into solid the particle get more compact and closer together. So in that case the liquid will have lower density.

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The osmium with a density of 22.6g/cm3 has a volume in cm3 of 0.965 cm3

The density formula and the procedure we will use is:

ρ = m/v

Where:

Information about the problem:

Applying the density formula and isolating the volume (v), we get:

ρ = m/v

v = m / ρ

v = 21.8 g / 22.6g/cm3

v = 0.965 cm3

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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The volume occupied by a  21.8 g sample of osmium having a density of 22.6 g/cm3 is  0.965cm3.

The density formula is:

                           Density = mass/volume

To find volume:

                           Volume = mass/density

Now

mass = 21.8 g

density= 22.6 g/cm3

Putting the values

                        Volume = 21.8/22.6

                        volume = 0.965cm3

Thus the volume is 0.965cm3.

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The volume occupied of the sample of osmium  with a density of 22.6 g/cm³  and a mass of 21.8 g is: 0.9646 cm³

The density formula and the procedure we will use is:

d = m/v

Where:

Information about the problem:

Applying the density formula and clearing the volume we get:

d = m/v

v = m/ d

v = 21.8 g / 22.6 g/cm³

v = 0.9646 cm³

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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To prove to someone that the clear material is a mixture and not a compound, you could put the solution in a cup and then let the water evaporate. The baking soda will stay in the cup.

Baking soda is a NaHCO₃. Its chemical name of sodium bicarbonate. It is a salt of carbonates. It is used in making dishes. This is used to make cakes or other fermented foods.

Thus, you may put the solution in a cup and then let the water evaporate to demonstrate to someone that the clear substance is a mixture rather than a compound. The cup will hold the baking soda.

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A compound that occupies a receptor, but does not activate the neuron is known as an antagonist.

A neurotransmitter receptor (also known as a neuroreceptor) is a protein on the membrane that is activated by a neurotransmitter. Chemicals on the cell's surface, such as a neurotransmitter, can bind to the membrane, and receptors can be found along the membrane.

G-protein coupled receptors are found on the majority of neurotransmitter receptors. Neurotransmitter (NT) receptors can be found on the surface of neurons and glia. One neuron sends messages to the other neuron via neurotransmitters at a synapse.

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If a 2.760 g sample of carbon was burned, yielding 10.120 g of carbon dioxide, the grams of oxygen taken up by the reaction was 7.360 g

The balanced equation of chemical reaction is :

C + O₂ → CO₂

Given data is-

Given mass of Carbon- 2.760 g

Amount of carbon dioxide produced- 10.120 g

The molecular mass of carbon dioxide = 44.0 g/mole

To calculate number of moles, equation used is,

 Number of moles (n) = Given mass

                                        Molar mass

            n =      10.120 g      

                      44.0 g/mole

               = 0.23 moles

So, The number of moles of oxygen produced is,

number of moles of O₂ = number of moles of CO₂

n = 0.23 moles.

Now, the molecular mass of oxygen is,

M = (2 × 16.0)g/mole = 32.0 g/mole

Mass of product = number of moles × molecular mass

m = (0.23 × 32.0) g

m = 7.360 g

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Molarity of a solution prepared by dissolving 3.50 mol nacl in enough water to make 1.50 l of solution is 2.33 mol /L

Molarity is a physical quantity that describes the substance's number of moles available in the unit liter volume of the solution. A mole per liter is a measurable unit to explain molarity.

Number of moles of the NaCl is

np = 3.50 mol

The volume of the solution is np = 1.50 L

The expression for the molarity solution is cm = np/vp

At the value and get the above expression

Cm = 3.50/ 1.50

      = 2.33 mol /L

Thus the molarity of the solution is 2.33 mol /L

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When substance a reacts with substance b, a new substance c is formed. based on this information, we can say that the given chemical reaction is spontaneous.

When two or more reactants combine together to form a final product without the loss of any atoms present in the reactants the reaction is known as addition reaction.

If a and b are elements, then they react with each other and form the compound c. Thus this will be the example of combination reaction in which one or more elements combine to form a compound. As no external energy is provided i.e., heat energy or catalyst , so we can also say that the given reaction is spontaneous.

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Rubidium's valence shell electron, "(ns(1))," is more loosely bound than in potassium due to the larger atomic size of rubidium. As a result, Rubidium is found in Group 1 below potassium.

When an atom's outer shell is open, a valence electron, which is an electron attached to it, can take part in the creation of a chemical bond.

To form a shared pair in a single covalent bond, each atom in the bond contributes one valence electron.

an atom's valence shell electron, which is its outermost shell and which can be shared or transferred to another atom.

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HTQ would be the most likely daughter cell genotype if independent assortment does not occur.

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Suppose that the gene for a protein 500 amino acids in length undergoes a mutation. If the mutation causes the synthesis of a mutant protein in which just one of the 500 amino acids is incorrect.

The mutation is a condition in which there are changes in the DNA and gene. These changes are due to genetic mutation and other bio factors and radiation.

The protein may be folded incorrectly. And the protein will not attain its old structure. Because denature is an irreversible process and does not get the structure of its before.

Thus, the statement is incorrect.

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Answer:

Thomson used creativity to interpret the results of the cathode ray tube experiment. Explain how the atomic theory was modified from Dalton's theory to Rutherford's.

If a chemical plant near the source of the river is dumping mercury, then the mercury levels should be highest at the source and lowest at the mouth.

Further testing should show that this is a commonly followed rule. Observations should be explained in a published scientific paper. Scientists look for answers to questions and solutions to problems using a process called the scientific method. This process consists of observation, hypothesis development, and experimental design. Bringing additional observations hypotheses, and experiments in repeated cycles

Chemists use the scientific method to conduct experiments formulate hypotheses formulate laws, and develop theories to better understand how the natural world behaves. In scientific thinking, hypotheses are formed before applicable research is conducted. The theory, on the other hand, is supported by evidence. This is a principle formulated as an attempt to explain what the data already support.

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The exact density of the water sample with volume 11.3ml and mass 11.349g  is 1.004g/ml.

Density of a solution is defined as the ration of mass of the solution to the volume of the solution. Density is measured in g/cm³ for solids, g/ml for liquids, and g/L for gases.

As per the definition of density ,we can write

Density of solution  = (Mass of the Solution / Volume of the solution)

Mass of the water sample = 11.349g

Volume of water sample = 11.3ml

Density of Water sample = (Mass of water sample/Volume of Water sample)

Density of Water sample = (11.349g / 11.3ml)

Density of Water sample = 1.004g/ml.

The exact density of the water sample with volume 11.3ml and mass 11.349g  is 1.004g/ml.

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Answer:

22.68

Explanation:

Since about 2.2 lbs = 1kg, 50 pounds is about 22.68.