Help plz (will mark brainleist)

Answer:

The element was one of the alkaline metals, the dull appearance comes from the metal reacting with oxygen and oxidizing its outer surface as alkaline are known for their enormous reaction with oxygen in the air and water.

Another ability of this group of elements is the ability to conduct electricity. And they are also easy to cut with a kitchen knife.

Answer:

The insect exerts no force on the windshield, and the windshield strikes the insect with a large force.

Explanation:

:#D

The item that would most likely end up in the waste stream soonest is a single-use plastic item, such as a plastic bag or disposable plastic utensil. These items are designed for short-term use and are typically discarded shortly after use.

The item that would most likely end up in the waste stream soonest would be a disposable plastic water bottle. These bottles are commonly used and quickly disposed of after a single use, contributing to the waste stream more quickly than other durable or reusable items. In general, reducing waste generation, practicing responsible consumption, and promoting recycling and other sustainable waste management practices can help minimize the impact of waste on the environment.

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While Separating sand and salt by filtration and evaporation, the observation is during the filtration the sand gets accumulated in the filter paper while separating it from the salt solution, while in evaporation the salt gets accumulated.

When we tried to separate the individual components from the mixture of the salt and sand the first step is dissolving the mixture in water as the salt gets dissolved so it is easy for us to filter the sand from the solution, it is followed by the method of evaporation, in which the filtered salt solution is boiled until the water gets evaporated and we are left with the salt,  that's how salt and sand are separated from a mixture.

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the mass of a billiard ball that has a volume of 100 cm³ and a density of 2. 5 g/cm³ is 250 g

mass  can be determined by the density of an object and volume.

The mass of a substance can be calculate by using the formula

From the question

mass = density * volume

mass = 2. 5 g/cm³ * 100 cm³

mass = 250 g

therefore,the mass of a billiard ball that has a volume of 100 cm³ and a density of 2. 5 g/cm³ is 250 g

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I think the answer is A. I know it's Planet X.

The pH of a 0.0001M (10-4 M) HCl solution is  4 ; The pH of a sample of milk is 6.5, while a sample of soft drink has a pH of 4.5. The hydrogen ion concentrations ([H ]) of the two samples are 3.16 x \(10^{(-7)\) mol/L, 3.16 x \(10^{(-5)\) mol/L.

To determine the pH of a solution, we can use the equation:

pH = -log[H+]

1. For a 0.0001M (\(10^{-4\) M) HCl solution:

pH = -log(0.0001)

pH = -(-4)

pH = 4

Therefore, the pH of the 0.0001M HCl solution is 4.

2. The pH of milk is 6.5, we can find the hydrogen ion concentration ([H+]) using the inverse of the pH equation:

[H+] = \(10^{(-pH)\)

[H+] = \(10^{(-6.5)\)

[H+] = 3.16 x \(10^{(-7)\) mol/L

Therefore, the hydrogen ion concentration of the milk sample is 3.16 x \(10^{(-7)\) mol/L.

3. Soft drink with a pH of 4.5:

[H+] =\(10^{(-pH)\)

[H+] = \(10^{(-4.5)\)

[H+] = 3.16 x \(10^{(-5)\) mol/L

Therefore, the hydrogen ion concentration of the soft drink sample is 3.16 x \(10^{(-5)\) mol/L.

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Explanation:

this is a very easy question, you just need to know the formula of density, the mass and volume.

you're given the mass of the iron which is 28.5g and when it is submerged into a cylinder containing 45.50 ml, it rises to 49.10 ml. the volume of water displaced gives you the volume of the iron. thus,

V² - V¹ = 49.10 ml - 45.50 ml

V of iron = 3.6 ml

now that you know both the mass and volume, you can work out the question.

density (ρ) = mass / volume

ρ = m/v

ρ = 28.5 g / 3.6 ml

ρ = 7.916666...

ρ = 7.92 g/ml (3 sf)

hope this helps you!

- s.

The vanilla extract can be used in the house to;

Vanilla beans are steeped in ethyl alcohol and water to produce vanilla extract, an aromatic, amber-colored liquid. pure vanilla extract is gotten through macerating and percolating vanilla pods in an ethanol and water mixture, vanilla extract is created.

In many Western sweets, particularly baked goods like cakes, cookies, brownies, and cupcakes, as well as custards, ice creams, and puddings, it is seen as a necessary component.

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The volume of carbon dioxide gas produced at STP during the reaction is equal to 56 L.

Combustion reactions involve the complete oxidation of the fuel a hydrocarbon such reactions commonly liberate only carbon dioxide and water as products.

A hydrocarbon undergoes combustion to yield carbon dioxide and small amounts of water as the product. It can also be noted that no side products are left behind in the combustion reaction.

The given balanced combustion reaction of alcohol:

C₂H₅OH (l)  +  3O₂  (g) →  2CO₂  (g)  +  3 H₂O  (g)

One mole of the ethanol produced carbon dioxide = 2 mol

Then 1.25 mol of the alcohol produced carbon dioxide = 2.5 mol

The volume occupied by one mole of carbon dioxide = 22.4 L

The volume of  2.5 mol of CO₂ = 22.4 × 2 = 56 L

Therefore, the volume of CO₂ gas produced during the reaction is 56 L.

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Answer: 56L

Explanation: The volume of carbon dioxide gas produced at STP during the reaction is equal to 56 L.

The term coordinate covalent bond is best described as option C: "A coordinate covalent bond is a bond in which one atom supplies both of the shared electrons in the bond."

In a coordinate covalent bond, one of the atoms involved in the bond donates both of the electrons needed for the bond formation, while the other atom does not contribute any electrons. This type of bond can also be referred to as a dative bond or a Lewis acid-base bond.

Option A is the definition of a regular covalent bond, where both atoms contribute one electron to form the bond. Option B is describing a hydrogen bond, which is a weak force of attraction between a hydrogen atom in one molecule and a highly electronegative atom in another molecule.

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The expression for the isothermal compressibility for a van der Waals gas is given by:
κ = −1/Vm (∂Vm/∂P)T
where Vm is the molar volume of the gas.

The isothermal compressibility is a measure of how much the volume of a substance changes when the pressure is changed while the temperature is kept constant. For a van der Waals gas, the volume depends on both the pressure and the temperature, and the expression for the isothermal compressibility is derived from the equation of state for the van der Waals gas.

The equation of state for a van der Waals gas is:

(P + a/Vm2)(Vm − b) = RT

where P is the pressure, T is the temperature, R is the gas constant, a and b are constants that depend on the properties of the gas, and Vm is the molar volume.

To obtain the expression for the isothermal compressibility, we start by differentiating the equation of state with respect to pressure at constant temperature:

(∂/∂P)(P + a/Vm2)(Vm − b) = (∂/∂P)(RT)

(1 + 2a/Vm3)(Vm − b) − (P + a/Vm2)(∂Vm/∂P) = 0

Solving for (∂Vm/∂P) gives:

(∂Vm/∂P) = (Vm2 − bVm − a)/(Vm2P + aP − 2aVm2)

Substituting this expression into the definition of the isothermal compressibility gives:

κ = −1/Vm [(Vm2P + aP − 2aVm2)/(Vm2 − bVm − a)]

Simplifying this expression using the equation of state gives:

κ = −1/Vm [(RTVm2)/(Vm3 − (b + RT/P)Vm2 + aV2m − abP/V)]

Finally, rearranging this expression gives the correct answer:

κ = 1/Vm [(RT(Vm − b)3 + 2aV3m)/(Vm3 − (b + RT/P)Vm2 + aV2m − abP/V)]

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Answer:

Elements on the left side of a row always have higher atomic mass than elements on the right side of that row.

Explanation:

the answer I have above should be correct because it’s false so it’s the right answer.

Explanation:

We are given different isotopes and we have to identify the number of protons and neutrons that are in the nuclueus of each atom.

a) Carbon-14:

By definition two isotopes are atoms that have the same atomic number but different mass number. The atomic number of an atom is equal to the number of protons of that atom, and the mass number is equal to the number of protons plus the number of neutrons.

atomic number = n° of protons

mass number = n° of protons + n° of neutrons

n° of protons = atomic number

n° of neutrons = mass number - n° of protons

n° of neutrons = mass number - atomic number

If two isotopes have the same atomic number but different mass number we can say that two isotopes have the same number of protons but different number of neutrons.

In we pay attention to carbon-14 we can look for its atomic number in the period table: 6. And its mass number is the one that we are given after the name of the element: 14.

n° of protons = atomic number = 6

n° of protons = 6

n° of neutrons = mass number - atomic number = 14 - 6

n° of neutrons = 8

b) Cobalt-60:

atomic number = 27 (from the periodic table)

mass number = 60

n° of protons = atomic number = 27

n° of protons = 27

n° of neutrons = mass number - atomic number = 60 - 27

n° of neutrons = 33

c) Gold-197:

atomic number = 79 (from the periodic table)

mass number = 197

n° of protons = atomic number = 79

n° of protons = 79

n° of neutrons = mass number - atomic number = 197 - 79

n° of neutrons = 118

d) Uranium-235:

atomic number = 92 (from the periodic table)

mass number = 235

n° of protons = atomic number = 92

n° of protons = 92

n° of neutrons = mass number - atomic number = 235 - 92

n° of neutrons = 143

Answer:

a) Carbon-14: n° of protons = 6 n° of neutrons = 8

b) Cobalt-60: n° of protons = 27 n° of neutrons = 33

c) Gold-197: n° of protons = 79 n° of neutrons = 118

d) Uranium-235: n° of protons = 92 n° of neutrons = 143

Answer:

when a substance is heated it gains thermal energy. Therefore its particles move faster and its temperature rises. when a substance is cool it loses thermal energy which causes its particles to move more slowly and its temperature to drop

A substance gains thermal energy when it is heated. As a result, its temperature increases, and its particle motion accelerates.

Thermal energy is the heat energy that is given to a substance when its temperature is increased.

As we know, all matter are made up of atoms, and atoms are made up of charged particles. These particles become random or come in motion when they get thermal energy or heat.

When substances get thermal energy or heat energy. They become active, and the particles move apart from each other.

So, due to thermal energy, the atoms become loose, and the substance loses its shape, the temperature decrease the atoms come closer to each other.

Thus, when a substance cools, thermal energy is lost, which slows down the movement of its particles and lowers the substance's temperature and vice versa.

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The middle-placed graph illustrates the appropriate transformation.

Chemical transitions, also called chemical reactions, are the processes by which one or more chemicals are changed into one or more novel and separate substances. In other words, a catalyst involving atom rearrangement is referred to as a chemical transformation.

An transformation is a significant modification of form or appearance. A significant life change can result from an event like acquiring your driver's license, enrolling in college, or getting married. A transformation is indeed a significant, dramatic change.

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Answer: number 2

Explanation:

well you see if the bottom left corner of the shape which we are going to call Q first starts at (5,2) and we move it 4 down then we have (5,-2).

Now for the tricky part if we are moving it 90° counterclockwise around the origin. to put it simple and a easy way to understand is if you just turn your head sideways to the left and just put what you had in the first (top right) box and copy onto the top left box.

So instead of Q being (5,-2), Q would be (2,5).

I hope this helps and if I'm too late and you alertly answered it then I hope this helps anyone else who might have this problem and stumbles upon this.

Answer:

About 1.48 M.

Explanation:

The formula for molarity is mol/L.

So firstly, you must find the amount of moles in 250 grams of NaCl.

I do this by using stoichiometry. First, I find how nany grams are in a single mole of NaCl. This is around 58.44 grams/mole. Now that I know this, I can now use a stoich table. (250 g NaCl * 1 mol NaCl / 58.44 g NaCl). I plug this into my calculator.

I get that 250 grams of NaCl is equal to about 4.28 moles.

Now I just plug into the formula!

4.28 moles/2.9 L = about 1.48

I've attached a picture of my personal notes below which shows work I have done in similar equations.

Answer:The decay decomposes dead organisms and creates fertile soil.

Explanation:it helps to digest food, and to recycle materials in our environment.

Answer:

N(CO2) = n(CO2) x Avogadros constant

n(CO2) = mass(CO2)/Molar mass(CO2) = 112/44 = 2.5454….

N(CO2) = 2.545454… x (6.02 x 10^23) = 1.5323636 x 10^24

Therefore, the number of CO2 molecules in 112 g of CO2 = 1.53 x 10^24 molecules

1.53 × 10²⁴ molecules CO₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

112 g CO₂

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of C - 12.01 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.53252 × 10²⁴ molecules CO₂ ≈ 1.53 × 10²⁴ molecules CO₂

Answer:

\(N2\)

Explanation:

Because  

Molecular nitrogen (N2) is a very common chemical compound in which two nitrogen atoms are tightly bound together.

Answer: Volcanic Eruptions

Explanation:

The reaction that occurs when lithium (Li) is added to water is a single displacement reaction.

The balanced chemical equation for this reaction is:

2Li + 2H₂O -> 2LiOH + H₂

In this reaction, lithium (Li) displaces hydrogen (H) from water, and forms lithium hydroxide (LiOH) by releasing hydrogen gas (H₂).

From the given information, the calorimeter initially contains 225.0 ml of water at 18.6°C. When 0.722 g of lithium (Li) is added to the water, the temperature of the resulting solution rises to a maximum of 53.4°C.

The reaction between lithium and water is highly exothermic, means it releases a significant amount of heat. The rise in temperature observed in the calorimeter is due to the heat released during the reaction between lithium and water.

Hence, the reaction that occurs when 0.722 g of lithium is added to the water in the calorimeter is the single displacement reaction between lithium and water, resulting in the formation of lithium hydroxide (LiOH) and the release of hydrogen gas (H₂).

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The total combined mass of carbon dioxide and water produced when the gasoline burns is approximately 151 kg + 70 kg = 221 kg.

To determine the total combined mass of carbon dioxide and water produced when the gasoline burns, we need to consider the balanced chemical equation for the combustion of gasoline:

C8H18 + 12.5O2 → 8CO2 + 9H2O

From the equation, we can see that for every 1 mole of gasoline (C8H18), 8 moles of carbon dioxide (CO2) and 9 moles of water (H2O) are produced.

First, we need to convert the mass of gasoline to moles using the molar mass of gasoline, which is approximately 114.22 g/mol.

49 kg of gasoline = 49,000 g

Moles of gasoline = 49,000 g / 114.22 g/mol ≈ 429.02 mol

From the balanced equation, we know that the ratio of moles of gasoline to moles of carbon dioxide is 1:8, and the ratio of moles of gasoline to moles of water is 1:9.

Moles of carbon dioxide = 429.02 mol × 8 = 3432.16 mol

Moles of water = 429.02 mol × 9 = 3861.18 mol

To convert the moles of carbon dioxide and water to mass, we need to use their respective molar masses.

Molar mass of carbon dioxide (CO2) = 44.01 g/mol

Molar mass of water (H2O) = 18.02 g/mol

Mass of carbon dioxide = 3432.16 mol × 44.01 g/mol ≈ 150,979.96 g ≈ 151 kg

Mass of water = 3861.18 mol × 18.02 g/mol ≈ 69,592.64 g ≈ 70 kg

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Answer:

it's-B.....................

Answer:

a is answer i think

Explanation:

18. Among the given species, A) PH3 B) CIF3 C)NC13 D) BC3 B) All of these will have bond angles of 120 will have bond angles of 120° The hybridization of atoms in PH3, CIF3, NC13, and BC3 molecules is sp3. Since there are no lone pairs, all of these molecules have a bond angle of 120°. Hence, the correct option is B.19.

The molecular geometry of the left-most carbon atom in the molecule below is tetrahedral. The given molecule is a pentane with five carbon atoms in it. So, the left-most carbon atom is a tetrahedral-shaped molecule. Hence, the correct option is C.20. The central Xe atom in the XeF4 molecule has 2 unbonded electron pairs and 4 bonded electron pairs in its valence shell. In the XeF4 molecule, the Xenon atom shares a single bond with each of the four Fluorine atoms present in the molecule. This makes up for four bonded electron pairs. Two lone pairs are left unbonded on the Xenon atom, giving a total of six electron pairs. Since there are four bonded pairs and two lone pairs, the answer is 4, 2.

Hence, the correct option is E.21. The molecular shape of H2O is a bent shape. The electron domains and a Bent shape molecule is the one that has two atoms attached to a central atom with one or two lone pairs present on the central atom. The molecular geometry of H2O is bent because the lone pairs exert a greater repulsive force than bonded pairs of electrons, forcing the bonded pairs to be closer to each other. Hence, the correct option is E.22. PCIs has 5, trigonal bipyramidal electron domains. In PCIs, the central Phosphorus atom is bonded to 5 other atoms. This gives a total of 5 electron domains around the Phosphorus atom. Hence, the correct option is D.

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To form a dipeptide between Alanine and Leucine, we have to join the carboxyl group (COOH) of Alanine with the amino group (NH₂) of Leucine via a peptide bond. The resulting molecule will have a zwitterionic form. The zwitterionic form of the dipeptide will have both a positive and a negative charge.

A dipeptide is a molecule made up of two amino acid residues joined together via a peptide bond. A peptide bond is a bond between the amino group (NH₂) of one amino acid and the carboxyl group (COOH) of another amino acid. Amino acids are the building blocks of proteins. Alanine and Leucine are two of the twenty common amino acids found in nature.

A zwitterion is a molecule that has a positive charge on one part of the molecule and a negative charge on another part of the molecule. Zwitterions are electrically neutral overall. They are formed when a molecule that has both acidic and basic functional groups is dissolved in a solvent. The acidic and basic groups react with each other to form a neutral molecule that has both positive and negative charges. The zwitterionic form of an amino acid is the form that is found in proteins.

The chemical formula for Alanine is C₃H₇NO₂, and the chemical formula for Leucine is C₆H₁₃NO₂. To form a dipeptide between Alanine and Leucine, we have to join the carboxyl group (COOH) of Alanine with the amino group (NH₂) of Leucine via a peptide bond. The resulting molecule will have a zwitterionic form. The zwitterionic form of the dipeptide will have both a positive and a negative charge.

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The mass of carbon dioxide in this is 264 g according to the given data.

The molar mass is basically the total mass in grams of the atoms that make up a molecule per mole. Molar mass is measured in grams per mole.

Combustion is the process of burning glucose in the presence of oxygen.

The balanced reaction is

\(C_6H_1_2O_6+6O_2---- > 6CO_2+6H_2O\)

As a result, each mole of glucose requires six moles of oxygen molecules.

Glucose has a molar mass of 180g per mole.

As a result, the reaction will be completed, with one mole of glucose reacting with six moles of oxygen to produce six moles of Carbon dioxide and six moles of water.

Carbon dioxide produced mass = moles X molar mass = 6 x 44 = 264 g

Thus, 264g will be the mass of the carbon dioxide produced.

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Answer:

False for the first, true for second.

Explanation:

ATP is cellular energy and it needs to be recharged after it is used. That half dead is called adp.

The statement energy is released from ATP when it reacts with water to produce ADP is False, while the statement the information that cells need to direct their metabolic process is stored in RNA is True.

ATP is the energy source of cells generated by cellular respiration and anaerobic processes, while  RNA is a molecule obtain by the transcription process which is used to generate proteins during metabolic activities such as differentiation.

Therefore, with this data, we can see that ATP is the energy coin of cells, while cells generate RNA during transcription.

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