A pure substance with one type of atom is called a(n

Answer: we know that 10 g of naphthalene is added to a test tube.  We determined and the cooling curve above that the freezing point of naphthalene is approximately 80.5  degreesC  .  We then add 1.1  g   of p-dichlorobenzene to the test tube.

Explanation:

Answer:

3.34x10¹⁶ molecules of aspirin are in a drop of blood

Explanation:

The recomended dose of aspirin in blood is 100.0μg/mL =

1x10⁻⁴g aspirin / mL of blood.

In a drop (0.100mL) there are:

0.100mL ₓ (1x10⁻⁴g aspirin / mL of blood) = 1x10⁻⁵g aspirin.

Molecular mass of aspirin is:

9C = 12.01g/mol ₓ 9 = 108.09g/mol

8H = 1.01g/mol ₓ 8 = 8.08g/mol

4O = 16g/mol ₓ 4 = 64g/mol

108.09 + 8.08 + 64 = 180.17g/mol

Thus, moles of aspirin in 1x10⁻⁵g are:

1x10⁻⁵g ₓ (1mol / 180.17g) = 5.55x10⁻⁸ moles of aspirin

In 1 mole, you have 6.022x10²³ molecules, thus:

5.55x10⁻⁸ moles of aspirin ₓ (6.022x10²³ molecules / 1 mole ) =

Answer:

its bar graph

Explanation:

When a gas expands, the sign of w is negative.

When a gas contracts, the sign of w is positive.

The sign of w for the process of boiling water is negative.

In the first law of thermodynamics, the energy of the universe is constant. A system can change its internal energy through a flow of work, heat, or both, and therefore the total amount of heat energy and the total amount of work energy that goes in or out must be equal to the total internal energy change of the system (ΔE).

                                         ∆E = q + w

        ΔE = change in internal energy

         q =  heat

         w = work energy

When we add a property to the system from the surroundings, the sign is positive and when the system adds a property to the surroundings the sign is negative.

To boil water, heat must be added so that q is positive. The molar volume of a gas is huge compared to the molar volume of a liquid. As a liquid converts to a gas, the system will expand its volume, performing work on the surroundings; w is negative.

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The electron configuration of a potassium atom at ground state is 1s²2s²2p⁶3s²3p⁶4s¹. Therefore, option D is correct.

The electron configuration of an element can be explained as electrons being occupied in different energy levels of an atom of a specific element. In the electron configuration, the electrons are usually written as a superscript of atomic subshells. For example, the electron configuration of Helium can be represented as 1s²2s².

The sequence of completely filled subshells similar to neighboring the electronic configuration of a noble gas is represented by square brackets. The principal quantum number (n) will be used to denote the maximum number of electrons in an electron shell.

The total number of electrons occupied in the given electronic configuration  1s²2s²2p⁶3s²3p⁶4s¹  is 19. The atomic number of potassium is 19 therefore it is the configuration of potassium.

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Step 1 - Understand the behavior of an electrolyte

An electrolyte is a substance that, when dissolved in water, makes a solution capable of conducting electricity. Generally speaking, electrolytes are water-soluble compounds which produce free-ions in solution, such as salts, acids an bases:

Water does not conduct electricity by itself, because it do not have free ions. Only a solution can produce free-ions: that's why we need electrolytes. The greater the number of free-ions produced, the greater will be the conducvity.

We can measure the conductivity by attaching a light bulb to the circuit. The brighter the light, the stronger the electrolyte.

Step 2 - Determining the weak electrolyte

Since the only substance that do not turn the light on is C, we can conclude that all other substances are electrolytes. Note that B produces only a dimly light, which means he is the weak electrolyte.

The main role of smart materials in course reading is to mimic biological behavior and "respond to stimuli". The class of solid materials which is used in course reading is usually composed of two or more of the other classes of materials to achieve a combination of properties.

There is an importance of smart materials in course reading because smart materials and systems are able to sense and respond to the environment around them. They have the potential which helps to improve existing technology and add new functionality to products. They have applications in a wide variety of areas and could have an very important role in waste reduction process.

Smart materials are mainly divided into 4 categories which involves Polymers, Ceramics, Metals and Smart Materials.

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Answer:

N2O5

Explanation:

First, you need to find the number of moles of each element in the compound. The molar mass of nitrogen is 14 g/mol and the molar mass of oxygen is 16 g/mol. So, the number of moles of nitrogen is 76 g / 14 g/mol = 5.43 mol and the number of moles of oxygen is 80 g / 16 g/mol = 5 mol.

Next, you need to find the simplest whole-number ratio between the number of moles of nitrogen and oxygen. This can be done by dividing both numbers by the smallest number of moles. So, the ratio is 5.43 mol / 5 mol = 1.09 : 1.

Since this ratio is close to 1:1, we can assume that the empirical formula of the compound is NO. However, since the molecular formula must be a whole-number multiple of the empirical formula, we need to multiply both subscripts by 2 to get N2O2.

Finally, we need to check if this molecular formula matches the given mass ratio. The molar mass of N2O2 is (2 * 14 g/mol) + (2 * 16 g/mol) = 60 g/mol. So, if we have 5.43 mol of N2O2, its mass would be 5.43 mol * 60 g/mol = 326 g. This does not match the given mass ratio.

Therefore, we need to try a different multiple of the empirical formula. If we multiply both subscripts by 5 instead of 2, we get N2O5. The molar mass of N2O5 is (2 * 14 g/mol) + (5 * 16 g/mol) = 108 g/mol. So, if we have 5.43 mol of N2O5, its mass would be 5.43 mol * 108 g/mol = 586 g. This matches the given mass ratio.

So, the correct answer is D. N2O5.

CaCl2 is the compound which is more likely to be ionic .

Ions, charged particles that develop when an atom (or group of atoms) gets or loses electrons, are the building blocks of ionic compounds. An anion is a negatively charged ion, whereas cations are positively charged ions. When two elements create molecules by a covalent link and share electrons, this results in covalent or molecular compounds.

When Cacl2 dissolve in  aqueous solution it gives Ca+² and cl- ions.

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Answer:

10.081g÷12.5cm³ = 0.806g/cm³

Answer

250 g

Procedure

Using 2 significant figures we have that

248.1 = 250 g

Answer:

1. water will freeze at a temperature below 32 degrees fahrenheit 0 degree celsius.

2. Ice will melt at a temperature above 32 degrees fahrenheit 0 degrees celsius.

3. water boils at 212 degrees fahrenheit or 100 degrees celsius.

The five isomeric C6H14 alkanes can be represented by their condensed formulas and bond-line formulas. The condensed formulas are C6H14, C6H14, C6H14, C6H14, and C6H14 for n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane, respectively. The bond-line formulas visually represent the carbon atoms and their connections using lines, with hydrogen atoms omitted. The isomers differ in the arrangement of carbon atoms and the presence and position of methyl (CH3) groups, leading to unique structures and physical properties.

The five isomers of C6H14 alkanes are n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. The condensed formulas for these isomers are C6H14, C6H14, C6H14, C6H14, and C6H14, respectively. In the condensed formulas, the number of carbon (C) atoms is indicated by the subscript 6, and the number of hydrogen (H) atoms is indicated by the subscript 14.

The bond-line formulas provide a visual representation of the carbon atoms and their connections in the molecule. In the bond-line formulas, carbon atoms are represented by vertices, and the bonds between them are represented by lines. Hydrogen atoms are omitted for simplicity. The isomers can be distinguished by the arrangement of carbon atoms and the presence and position of methyl (CH3) groups.

n-Hexane is a straight-chain alkane with six carbon atoms in a row. 2-Methylpentane has a branch consisting of a methyl group (CH3) attached to the second carbon atom of the pentane chain. 3-Methylpentane has a methyl group attached to the third carbon atom of the pentane chain. 2,2-Dimethylbutane has two methyl groups attached to the second carbon atom of the butane chain. Finally, 2,3-Dimethylbutane has one methyl group attached to the second carbon atom and another methyl group attached to the third carbon atom of the butane chain.

These isomers exhibit different physical properties due to their distinct structures. The arrangement of carbon atoms and the branching of methyl groups influence factors such as boiling points, melting points, and solubility. Understanding the structural isomerism of alkanes is important in organic chemistry as it impacts their reactivity and behavior in various chemical reactions.

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Answer:

K < Fe < Br < Kr

Explanation:

Given chemical elements;

      Potassium

      Iron

      Bromine

      Krypton

Problem; arrange in order of increasing electronegativity

Solution:

The electronegativity of an element measures the relative tendency with which the atoms of the element attracts valence electrons in the chemical bond.

 To solve this problem, we are going to use values of electronegativity from the Pauling's electronegativity table of elements;

       For;

            Potassium  = 0.8

            Iron = 1.83

            Bromine  = 2.8

            Krypton = 3.0

So;

  K < Fe < Br < Kr

Tagatose and Leloir pathways are two different metabolic pathways involved in the breakdown and utilization of dietary sugars, such as galactose.

The Tagatose pathway is a bacterial pathway that allows for the utilization of galactose, a monosaccharide similar to glucose, as an energy source.

In this pathway, galactose is converted into tagatose, another monosaccharide, by the enzyme galactose isomerase.

The tagatose is then broken down into dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3-phosphate (G3P) through a series of reactions, which can enter the glycolysis pathway for further energy production.

The Leloir pathway, on the other hand, is a pathway found in animals and some microorganisms that also converts galactose into glucose-6-phosphate (G6P), a molecule that can enter the glycolysis pathway.

In the Leloir pathway, galactose is converted into galactose-1-phosphate by the enzyme galactokinase, and then into UDP-galactose by the enzyme galactose-1-phosphate uridylyltransferase. UDP-galactose is then converted into UDP-glucose by the enzyme UDP-galactose 4-epimerase.

Finally, UDP-glucose is converted into G6P by the enzyme phosphoglucomutase.

In summary, while both pathways involve the conversion of galactose into glucose derivatives, the Tagatose pathway involves the conversion of galactose into tagatose and then into DHAP and G3P, while the Leloir pathway involves the conversion of galactose into G6P through a series of intermediate steps.

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The volume of methane is calculated by using ideal gas law equation (pv=nRT) and the volume of methane is 4.95L.

The volume (V) occupied by the n moles of any gas has pressure(P) and temperature (T) Kelvin, the relationship for these variables PV=nRT where R gas constant is called the ideal gas law.
Formula used :- pv= nRT.
where, p= pressure
v= volume,
n= number of moles,
R = gas constant,
T= temperature.
Given:- p= 1.5 atm, n= 3, R= 8.314, T= 298K, v=?
By putting values in the formula we will get:-
pv=nRT, or v=\(\frac{nRT}{p} = \frac{3*8.314*298}{1.5} = 4,955.14ml= 4.95L.\)

Hence, the volume of methane is 4.95L.
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Answer:

MASS

Explanation:

Formula for heat energy will be;

Q = mcΔt

Where;

m is mass

c is specific heat capacity

ΔT is change in temperature

Now, since both substances are copper, it means they will have the same specific heat capacities.

Thus, from the formula given earlier, it is seen that the mass is inversely proportional to the temperature change.

This means that the smaller the mass, the greater the temperature change.

Thus, the 3 g sample of copper will experience a greater temperature die to its smaller mass

Answer:

NH3 and NH4NO3

Explanation:

I took the test and guessed this since I couldn't find it here, it turned out to be correct so I thought I'd share.

The substances that can react with HNO3 to neutralize it  are NH3 and NH4NO3.

The term neutralization has to do with the reaction between an acid and a base to yiled salt and water only.

The substances that can react with HNO3 must be basic substances hence the substances required are NH3 and NH4NO3.

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Answer:

A.Cations are attracted to anions; anions are attracted to cations.

C.Cations are positive, anions are negative.

Explanation:

Cations are positively charged ions, which are formed when a neutral atom donates an electron or an electron pair for bonding and for reaching a more stable electron configuration.

Anions, on the other hand, are negatively charged ions, which are formed when a neutral atom gains an electron or an electron pair for bonding and for reaching a more stable electron configuration.

Through electrostatics, we know that negatives attract positives and vice-versa (Unlikes attract each other). Hence, Cations tend to strongly attract their counterparts, which are Anions.

Also, cations and anions can be innumerable in any substance.

Eg: Common Salt is a crystal lattice constituted by Na+ Cations and Cl- Anions.

Hence, A & C are the correct options.

Answer:

Carbon can form many different kinds of complex molecules because A) one carbon atom can bond with up to four other atoms, including carbon atoms

Explanation:

Carbon is an element that plays a fundamental role in the chemistry of life and the world around us. One of the key reasons for its versatility is its electronic configuration. Carbon has six electrons, with two occupying the innermost shell and four in the outermost shell, known as the valence shell.

The valence shell of carbon is not fully occupied, meaning it has four valence electrons available for bonding. These electrons can form covalent bonds by sharing electrons with other atoms, including carbon atoms. This ability to form multiple bonds allows carbon to create an extensive variety of molecular structures.Carbon can form single, double, or triple bonds with other carbon atoms or with atoms of other elements, such as hydrogen, oxygen, nitrogen, and many more. The ability to form multiple bonds provides carbon with a remarkable degree of flexibility in constructing complex molecules.

Furthermore, the ability to form stable covalent bonds with other carbon atoms allows carbon atoms to link together in long chains or form branching structures. This characteristic forms the basis of organic chemistry, where carbon-based compounds are the building blocks of life and a wide range of synthetic materials.

The unique properties of carbon, including its ability to form stable covalent bonds, create diverse structures, and support a wide range of chemical reactions, contribute to the immense variety and complexity of carbon-based molecules. Carbon serves as the backbone of countless organic compounds found in living organisms, including carbohydrates, proteins, lipids, and nucleic acids, which are essential for life as we know it.

In summary, carbon's ability to bond with up to four other atoms, including carbon atoms, allows for the formation of complex molecules. This versatility stems from its four valence electrons, which enable carbon to participate in diverse covalent bonding arrangements and create the rich tapestry of carbon-based compounds observed in nature and synthetic chemistry.

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Answer:

are electrons causing the ion to have a positive charge and anions are electrons that have a negative charge

Explanation:

When the mmol of OH - ions and mmol of H + ions is calculate the pH = 12.6 and volume of solution = 0.0428 M

We can take care of given issue in following advances. Evaluating of mmol of OH - ions and mmol of H + ions.

mmol of  Ba(OH)₂ = Concentration × Volume

                                0.20 M × 20 ml

                                    = 4 mmol

1 molecule of Ba(OH)₂ contain two OH - ions.

Therefore, mmol of OH - ions = 2 × ( mmol of  Ba(OH)₂

                                              = 8 mmol

mmol of H + ions = 0.10 M × 50 ml = 5.0 mmol

Consider reaction, H⁺ + OH⁻ → H₂O  

According to the  reaction, 1 mmol H⁺ reacts with 1 mmol OH⁻.  

therefore 5.0 mmol H + reacts with 5 mmol OH⁻ .  

Hence, excess mmol of  OH⁻ = 8.0 - 5.0

                                             = 3.0 mmol

Volume of solution = 20 ml + 50 ml = 70 ml

[ OH⁻ ] = 3.0 mmol / 70 ml

                 = 0.0428 M

We will have relation, pOH = - log [ OH⁻ ]

pOH= - log 0.0428

pOH = 1.41

We got relation, pH = 14 - pOH

          pH = 14 -1.41

             pH = 12.6

"Potential of hydrogen" has historically been associated with pH, which is also known as acidity. An aqueous solution's acidity or basicity can be measured using this scale. Acidic arrangements are estimated to have lower pH values than essential or antacid arrangements

An overabundance reactant is a reactant present in a sum in abundance of that expected to consolidate with the entirety of the restricting reactant. After the limiting reactant has been used up, an excess reactant is what remains in the reaction mixture.

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Answer: b

Explanation:

Answer:

C

Explanation:

Obviously, as there is no air to create friction or any opposing force against the rocket; and there is no force accelerating it.

The rocket will maintain its velocity

Answer:

it is 12

Explanation:

because matter can put be created or destroyed

Answer:

Salt and water is produced.

For example:-

NaOH(base)+HCl(Acid)=>NaCl(salt)+H20(water)

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b) good reflector of light, blue in color, In the given options, the pair of properties mentioned in b) is the only one where both properties are physical properties.

Both properties mentioned in option b are physical properties. Being a good reflector of light refers to the ability of an object to reflect light waves, which is a physical characteristic. Similarly, the color blue is a physical property as it describes the specific wavelength of light that an object reflects or absorbs.

In the given options, the pair of properties mentioned in b) is the only one where both properties are physical properties.

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Answer:increase

Explanation: the more electrons there are the bigger the electron field is and the bigger the atomic radii is

the answer is 17.031 g/mol

Answer:

17.031 g/mol

Explanation:

hard to explanation