Who performed the oil-drop experiment?
O A. Albert Einstein
B. Robert Millikan
O C. J. J. Thomson
D. Niels Bohr

Answer:

Yes it is a colligative Property

Explanation:

There is freezing point depression, boiling point elevation, Osmotic Pressure, Vapor Pressure Lowering

The question is mostly solved. The definition of heat is used for this problem which tells us:

Where,

Q is the heat added to the system, 120 J

m is the mass of the metal, 5.0 g

Cp is the specific heat of the metal, 0.385J/g°C

dT is the change of temperature:

T2 is the final temperature, unknown

T1 is the initial temperature, 22°C

We clear the final temperature from the equation:

Now, we replace the known data:

Answer:

The final temperature of the metal will be 84°C

The change in the temperature will be 84°C-22°C=62°C

The aqueous solutions can be arranged in increasing boiling point order as follows: 0.050m Al(ClO4)3 < 0.110m K2CO3 < 0.300m C6H12O6.

The boiling point of a solution is influenced by the concentration of solute particles in the solution. The greater the concentration of solute particles, the higher the boiling point. In this case, we are comparing the boiling points of three different aqueous solutions.

The solution with the lowest boiling point is 0.050m Al(ClO4)3. This is because Al(ClO4)3 is an ionic compound that dissociates into multiple ions in water, thereby increasing the number of solute particles. Higher concentration of solute particles raises the boiling point.

The solution with the next higher boiling point is 0.110m K2CO3. K2CO3 is also an ionic compound and dissociates into two ions in water. Although the concentration is higher compared to Al(ClO4)3, it is lower than that of C6H12O6.

The solution with the highest boiling point is 0.300m C6H12O6. C6H12O6, which is glucose, is a molecular compound and does not dissociate into ions in water. Therefore, it has the lowest concentration of solute particles among the given solutions, resulting in the lowest boiling point.

Hence, the correct order of increasing boiling points is 0.050m Al(ClO4)3 < 0.110m K2CO3 < 0.300m C6H12O6.

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Answer:

520ML and apparently I need to put more in this answer

Explanation:

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Step 1

The reaction must be completed and balanced as follows:

C3H8 + 5 O2 => 3 CO2 + 4 H2O

-------------

Step 2

Information provided:

20.0 g of C3H8

10.0 g of O2

----

Information needed:

1 mole of C3H8 = 44.1 g

1 mole of O2 = 32.0 g

(use your periodic table please)

-------------

Step 3

By stoichiometry,

C3H8 + 5 O2 => 3 CO2 + 4 H2O

44.1 g C3H8 ---------- 5 x 32.0 g O2

20.0 g C3H8 ---------- X

X = 20.0 g C3H8 x 5 x 32.0 g O2/44.1 g C3H8

X = 72.6 g O2

For 20.0 g of C3H8, 72.6 g of O2 is needed, but there is only 10.0 g of O2.

Therefore,

Answer:

The limiting reactant = O2

The excess = C3H8

Answer:

a. Same group, different period

b. Different group, same period

c. Different group, different period

d. Same group, different period

The  Periodic table is  an arrangement chemical elements, ordered by their atomic number, electron configurations, and chemical properties.  Electron configuration of an element is the arrangement of electrons within its atoms.

In the periodic table, the elements are arranged in rows and columns based on their electron configurations and chemical properties. The rows are called periods and the columns are called groups.

The electron configuration of an element is represented by a series of numbers and letters that indicate the number of electrons in each energy level or shell of the atom. For example, the electron configuration of carbon is 1s² 2s² 2p², which means that there are two electrons in the first energy level (in the 1s orbital), two electrons in the second energy level (in the 2s orbital), and two electrons in the third energy level (in the 2p orbital).

The periodic table provides a systematic way of organizing the elements based on their electron configurations and chemical properties, which makes it a valuable tool for understanding the behavior of elements in chemical reactions and in various chemical applications.

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1.

Fe +52 - Fe253

SYNTHESIS REACTION

A synthesis reaction occurs when two or more reactants combine to form a single product.

2.

Pb(NO3)2 + K2CrO 4 PbCrO 4 +KNO3

DOUBLE REPLACEMENT

A double-replacement reaction exchanges the cations (or the anions) of two ionic compounds.

3.

H2 + N2 + NH3

SYNTHESIS REACTION

A synthesis reaction occurs when two or more reactants combine to form a single product.

4.

Fe + CuCl2 - FeCl2 + Cu

SINGLE REPLACEMENT

A single-displacement reaction, is a chemical reaction in which one element replaces an/other element in a compound.

Note. An element can only replace an element that it is higher than in the electrochemical series or an element that is less reactive than itself.

5.

KCIO3 -KCI + O2

DECOMPOSITION REACTION

A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances.

Most times this type of reaction requires an in put of energy.

It is usually an endothermic reaction as heat is mostly absorbed.

6.

Mg + HCI-H2 + MgCl2

SINGLE REPLACEMENT

A single-displacement reaction, is a chemical reaction in which one element replaces an/other element in a compound.

Note. An element can only replace an element that it is higher than in the electrochemical series or an element that is less reactive than itself.

7.

C3Hg + O2 CO2 + H2O

COMBUSTION REACTION

Combustion reaction is a high-temperature exothermic redox chemical reaction between a fuel (example propane C3H8) and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products.( mostly C02)

It can also be referred to as burning.

Combustion reaction is one of the chemical characteristics of hydrocarbons.

8.

Zn + HCI - ZnCl2 + H2

SINGLE REPLACEMENT

A single-displacement reaction, is a chemical reaction in which one element replaces an/other element in a compound.

Note. An element can only replace an element that it is higher than in the electrochemical series or an element that is less reactive than itself.

9.

NH3-N2 + O2

DECOMPOSITION REACTION

A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances.

Most times this type of reaction requires an in put of energy.

It is usually an endothermic reaction as heat is mostly absorbed.

10.

AgNO3 + Cu Cu(NO3)2 + Ag

f70X

SINGLE REPLACEMENT

A single-displacement reaction, is a chemical reaction in which one element replaces an/other element in a compound.

Note. An element can only replace an element that it is higher than in the electrochemical series or an element that is less reactive than itself.

V2 = 250 ml

Explanation:

Given:

P1 = 0.99 atm. V1 = 240 ml

P2 = 0.951 atm. V2 = ?

We can use Boyle's law to solve for V2

P1V1 = P2V2

V2 = (P1/P2)V1

= (0.99 atm/0.951 atm)(240 ml)

= 250. ml

Answer:

183 K

General Formulas and Concepts:

Chemistry - Gas Laws

Combined Gas Law: PV = nRT

Explanation:

Step 1: Define

10.0 L

3.00 mol H₂

4.50 atm

Step 2: Find Temperature

Step 3: Check

Round to the nearest whole number.

182.704 K ≈ 183 K

A solution of iodine changes from brown to blue when starch is added to it. You are observing the disappearance of reactants over time. Therefore, the correct option is option B.

A homogenous mixture of more than one component is referred to as a solution. On a particle-by-particle basis, it is homogeneous. Most of the time, people picture it as a liquid that has dissolved solids, liquids, or gases in it. This is not totally accurate, though. Alloys are a good alternative that we may use.

Solute is the name for the part of a solution that dissolves in the solvent. The solute constitutes the solution's tinier component. For instance, iodine represents the solute in "tincture of iodine," an alcohol-based solution of iodine. A solution of iodine changes from brown to blue when starch is added to it. You are observing the disappearance of reactants over time.

Therefore, the correct option is option B.

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Answer:I’m not 100% sure but I think it’s the first answer.

Explanation:

The pressure would increase as the molecules are pushing out word more and more, leading to more space being taken and more pressure. But then again, I’m not sure. I’m just a freshman with below average grades.

1 L of the acid solution contains 142.85 mg of CaCO3.

Given, mass of H2SO4 = 140 mg / L

The molecular weight of H2SO4 = 98g / mol

Molarity = mass of H2SO4 / molecular weight of H2SO4 = 140/98 = 1.4285

Normality = Molarity x n factor n factor for H2SO4 = 2Molarity = 1.4285

Normality = 2 x 1.4285 = 2.857 mg / mL1 mol of H2SO4 = 98 g

Hence, 1 ml of H2SO4 = 98/1000 = 0.098gCaCO3 has a molecular weight of 100 g. Therefore, 1 mole of CaCO3 has a mass of 100 g. According to this, 1 mole of CaCO3 reacts with 2 moles of H2SO4.

The normality of the acid is 2.857.

Hence, 1 L of the acid will have 2.857 moles of H2SO4.To calculate the concentration in mg/L of the acid in terms of CaCO3, we need to first find the number of moles of CaCO3 that can be reacted with 2.857 moles of H2SO4.2 moles of H2SO4 react with 1 mole of CaCO3.Therefore, 2.857 moles of H2SO4 will react with:

1 mole of CaCO3/2 moles of H2SO4 = 1.4285 moles of CaCO3In 1 L of the acid, there are 1.4285 moles of CaCO3.The mass of 1.4285 moles of CaCO3 = 1.4285 x 100 = 142.85 g / L

Therefore, 1 L of the acid solution contains 142.85 mg of CaCO3.

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Answer:

.

Explanation:

Diffusion is the net movement of anything from a region of higher concentration to a region of lower concentration.

Osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules,

Similarly : Both diffusion and osmosis occur to stabilize the concentration of molecules.

Difference : Osmosis can only function in a liquid medium, but diffusion can occur in all three mediums (solid, liquid and gas).

Hope it helps..

Answer: 4.30 moles of CO2

Explanation:

4.30 moles of carbon dioxide gas occupy a volume of 93.3 L at 162 kPa and a temperature of 100°C.

The type of ion that is directly required for fusion of a vesicle to the cell membrane, resulting in the release the neurotransmitters into the synapse is Calcium ions (Ca2+).

When a neuron wants to send a message to another neuron or muscle cell, it releases neurotransmitters into the synaptic cleft. The neurotransmitters are packed into tiny structures known as synaptic vesicles that are released when a neuron fires an action potential.

Vesicles that contain neurotransmitters such as dopamine, GABA, glutamate, and acetylcholine are among the most common. The synaptic vesicles bind to the cell membrane and release their neurotransmitters into the synaptic cleft during exocytosis, allowing the neurotransmitters to bind to receptors on the receiving neuron.

The vesicle fusion process is a complex process that involves several proteins and molecules, including calcium ions (Ca2+). Calcium ions (Ca2+) bind to proteins known as synaptotagmins, which are located on the surface of synaptic vesicles, in order to initiate the fusion process.

Calcium ions (Ca2+) activate synaptotagmins, which then initiate a chain reaction that culminates in the fusion of the synaptic vesicle membrane and the presynaptic membrane, resulting in the release of neurotransmitters into the synaptic cleft.

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Answer:

True

Metals above hydrogen in the reactivity series will displace hydrogen from acids, forming a salt and releasing hydrogen gas. Metals below hydrogen in the reactivity series are not reactive enough to displace hydrogen and will not react with acids to form hydrogen gas.

The molarity of the sugar solution is approximately 0.0334 M. To calculate the molarity of a solution, we need to know the moles of solute (in this case, sugar) and the volume of the solution in liters.

First, we need to calculate the moles of sugar in the solution:

Moles of sugar = mass of sugar / molar mass of sugar

The molar mass of sucrose (C₁₂H₂₂O₁₁) can be calculated by summing the atomic masses of the constituent elements:

Molar mass of sucrose = 12(12.01 g/mol) + 22(1.01 g/mol) + 11(16.00 g/mol)

= 342.3 g/mol

So the moles of sugar in the solution are:

Moles of sugar = 4 g / 342.3 g/mol

= 0.01167 mol

Next, we need to convert the volume of the solution from milliliters to liters:

Volume of solution = 350 ml / 1000 ml/L

= 0.350 L

Now we can calculate the molarity of the sugar solution:

Molarity = moles of sugar / volume of solution

= 0.01167 mol / 0.350 L

= 0.0334 M

Therefore, the molarity of the sugar solution is approximately 0.0334 M.

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Answer:

a

Explanation:

potential energy is something that could happen but haven't yet

Answer:

Because of the summer season

Explanation:

The water in the dish which is uncovered will evaporate faster as compared to the one which is

covered. This is because the air above the uncovered dish has less water vapour over it as

compared to the one which is covered. The covered dish has good amount of moisture over it as

the closed lid does not allow the moisture to come in direct contact with air.

Answer:

Pure water: electrolyte (poor)

Tap water: electrolyte (small amount)

Sugar solution: nonelectrolyte

Sodium chloride solution: electrolyte

Hydrochloric acid solution: electrolyte

Lactic acid solution: electrolyte.

Ethyl alcohol solution: nonelectrolyte

Pure sodium chloride: strong electrolyte

Explanation:

Electrolytes are part of a solution that conduct electricity, while nonelectrolytes do not conduct electricity in a solution.

Answer:

A. Nucleotide

Explanation:

Nucleotides are the monomers that make up nucleic acids, such as DNA and RNA.

After considering all the given data we conclude that A)  the ratios of the balanced chemical equation is 2:1, 2:2, 1:2, B) the number of moles of hydrogen needed is 0.5 mol H₂,  C) moles of oxygen are required for the combustion is 15.8, the balanced chemical equation is N₂(g) + O₂(g) → 2NO(g), D) a)552 g NO₂ will be formed when NO reacts, b) NO reacts with 384 g O₂, c)360 g NO are required to react with 384 g O₂.

Here are the mole ratios for the balanced chemical equation below:

2Ca + O₂ → 2CaO

A) The mole ratio between Ca and O₂ is 2:1 since 2 moles of Ca were needed to produce 1 mole of O₂. The mole ratio between Ca and CaO is 2:2 since 2 moles of Ca were needed to produce 2 moles of CaO. The mole ratio between O₂ and CaO is 1:2 since 1 mole of O₂ was needed to produce 2 moles of CaO.

B)The balanced equation for the reaction between hydrogen and oxygen to produce water is:

2H2 + O₂ → 2H₂O

From this equation, we can see that 2 moles of hydrogen react with 1 mole of oxygen to produce 2 moles of water. Therefore, to produce 5.0 mol of water, we would need:

5.0 mol H₂O × (2 mol H₂ / 2 mol H₂O)

= 5.0 mol H₂

So we would need 5.0 moles of hydrogen to produce 5.0 moles of water.

C) The balanced equation for the combustion of ethane is:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

According to this equation, 7 molecules of oxygen are required for the complete combustion of 2 molecules of ethane1. Therefore, we can calculate how many moles of oxygen are required for the combustion of 4.50 mol of ethane as follows:

(7 mol O₂ / 2 mol C₂H₆) x (4.50 mol C₂H₆) = 15.8 mol O₂

Therefore, 15.8 moles of oxygen are required for the combustion of 4.50 mol of ethane.

D) a) The balanced equation for this reaction is:

N₂(g) + O₂(g) → 2NO(g)

b) To find out how much NO₂ is formed when NO reacts with 384 g O₂, we first need to find out how many moles of O₂ are present in that amount. We can use the molar mass of O₂ (32 g/mol) to convert grams to moles:

384 g O₂ × (1 mol / 32 g) = 12 mol O₂

From the balanced chemical equation above, we know that one mole of NO reacts with one mole of O₂ to form one mole of NO₂. Therefore, if we have 12 molO₂ present, then we will also form 12 mol NO₂.

To find out how much mass that corresponds to, we can use the molar mass of NO₂ (46 g/mol):

12 mol NO₂ × (46 g / mol) = 552 g NO₂

Therefore, 552 g NO₂ will be formed when NO reacts with 384 g O₂.

c) To find out how many grams of NO are required to react with this amount of O₂, we first need to find out how many moles of NO are required. From the balanced equation above, we know that one mole of NO reacts with one mole of O₂.

Since we have 12 mol O₂ present (as calculated in part b), then we will also need 12 mol NO.

To convert from moles to grams, we can use the molar mass of NO (30 g/mol):

12 mol NO × (30 g / mol) = 360 g NO

Therefore, 360 g NO are required to react with 384 g O₂.

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Answer:

             27.025 g of H₂O

Explanation:

The Balance chemical equation is

                                   2 H₂ + O₂ = 2 H₂O

Step 1: Calculate Limiting Reagent

Moles of H₂

                        Mole = 16 g / 2.02 g/mol = 7.937 mol

Moles of O₂

                        Mole = 24 g / 32.00 g/mol = 0.750 mol

Mole ratio of H₂ : O₂ is 2 : 1. Hence, 7.937 mol of H₂ will need 3.9685 mol of O₂. This means O₂ is limiting reagent.

Step 2: Calculate Moles of H₂O

0.750 mol of O₂ will produce 1.50 mol of H₂O because the mole ratio of O₂ : H₂O is 1 : 2.

Step 3: Calculate mass of H₂O

                          Mass = 1.50 mol × 18.02 g/mol = 27.025 g of H₂O

Taking into account the definition of dilution, the concentration of the original solution is 7.4×10⁻³ M.

Dilution is the process of reducing the concentration of solute in solution. This is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

Ci× 2 mL= 5.92×10⁻⁴ M× 25 mL

Solving:

Ci= (5.92×10⁻⁴ M× 25 mL)÷ 2 mL

Ci= 7.4×10⁻³ M

In summary, the initial concentration is 7.4×10⁻³ M.

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Answer:

The law of reflection states that the angle of incidence and the angle of reflection are always equal.