1.What phase change is being observed when ice melts? *

2. What phase change is being observed when water droplets are found outside the glass of a cold water?

3. When dry ice (CO2) is placed on top of the table, after couple of minutes there is no dry ice left. What kind of phase change is it?

4. How do we classify the phase changes in matter if we put water in the freezer of the refrigerator? ​

Answer:

22.4 liters.

Explanation:

The volume occupied by a gas at standard temperature and pressure (STP) can be calculated using the Ideal Gas Law: PV = nRT.

In this equation, P represents the pressure, V represents the volume, n represents the number of moles of gas, R is the universal gas constant (8.31 J/mol*K), and T is the temperature in Kelvin.

At STP, the pressure is 1 atm and the temperature is 0°C (273 K). If we know the number of moles of gas, we can calculate the volume it would occupy at STP.

For 100 grams of oxygen gas, we first need to convert the mass to moles using the molar mass of oxygen (32 g/mol).

So, 100 g / 32 g/mol = 3.125 moles of oxygen.

Then, plugging in the values into the Ideal Gas Law equation:

V = nRT / P

V = (3.125 moles) * (8.31 J/mol*K) * (273 K) / (1 atm)

The volume would be approximately 22 L,


ALLEN

Answer:

Satellite images

Explanation

Answer:

a

Explanation:

i think or c ok by g hope it helps

The correct IUPAC name of the given alkyne (5-ethynyldecane) is 5-ethynyldec-1-yne.

An alkyne is an unsaturated hydrocarbon containing a triple bond between two carbon atoms. It has the general formula CnH₂n-2. The common names of alkynes are derived from the corresponding alkanes by replacing the suffix -ane with -yne. However, the IUPAC system provides a systematic and standard method of nomenclature for organic compounds. It is based on the longest carbon chain, functional group, and substituents present in the compound.

In the given alkyne, the longest carbon chain contains ten carbon atoms. The triple bond is present between the fifth and sixth carbon atoms from the left end. Therefore, the parent chain is decane and the triple bond is located between the fifth and sixth carbon atoms. The prefix ethynyl (-C≡C-) represents the substituent attached to the fifth carbon atom. Therefore, the IUPAC name of the given alkyne is 5-ethynyldec-1-yne.

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three resonance structures The Carbonate (CO2) Ion, in contrast to O3, has three resonance structures on average in its actual structure.

three carbon dioxide structures that resonate: There are three resonating structures in CO2, one of which is a significant contributor. There are a total of 16 valence electrons in the CO2 molecule—four from carbon and six from each oxygen atom.

No. of solitary pair=8 ∵ 8 sets of e− of oxygen didn't took part in holding.

Resonance structures are a collection of two or more Lewis structures that, taken as a whole, represent the electronic bonds and charges of a single polyatomic species.

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Answer:

the answer is C Ozone

hope that helps

Hyperventilation, with a resulting decrease in \(PaCO_2\), is an expected compensatory reaction to the acid-base disorder of metabolic acidosis.

Metabolic acidosis is a condition characterized by a decrease in blood pH and bicarbonate levels, which can occur due to various causes such as diabetic ketoacidosis, lactic acidosis, renal failure, and ingestion of certain toxins. In response to this acidosis, the body tries to compensate by increasing respiration, resulting in hyperventilation.

Hyperventilation helps to decrease the concentration of carbon dioxide (\(CO_2\)) in the blood, which is an acid. By breathing rapidly and deeply, more \(CO_2\) is expelled from the body, which helps to restore the acid-base balance and increase the pH of the blood towards a normal level. This is known as respiratory compensation for metabolic acidosis.

However, it is important to note that hyperventilation can also lead to respiratory alkalosis if it continues for a prolonged period of time, resulting in a decrease in \(PaCO_2\) below normal levels. Therefore, careful monitoring and management of acid-base disorders is necessary to ensure appropriate compensation and avoid potential complications.

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The number of moles of CO2 in 35.8 g of carbon dioxide is 0.814mol

HOW TO CALCULATE NUMBER OF MOLES:

no. of moles = mass ÷ molar mass

Molar mass of CO2 = 12 + 16(2) = 44g/mol

no. of moles = 35.8g ÷ 44g/mol

no. of moles = 0.814mol

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Answer:

Sediment moves from one place to another through the process of erosion. Erosion is the removal and transportation of rock or soil. Erosion can move sediment through water, ice, or wind. Water can wash sediment, such as gravel or pebbles, down from a creek, into a river, and eventually to that river's delta.

Explanation:

Erosion refers to the washing away or the removal of top soils/rocks by agents such as water, wind, etc.

Erosion is the removal of topsoils or rocks by agents of erosions. These agents include water, wind, waves, and ice.

In water/ice erosion, topmost soils or rocks are washed away and deposited somewhere else, usually in or at the mouth of nearby water bodies.

Wind erosion carries soils/rocks and deposits them somewhere else. The deposition accumulates over a period of time to form different landforms.

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The decomposition reaction and then balance the equation CuCl2 → 2 CuCl + Cl.

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The correct formula for the ionic compound lithium oxide is Li2O.

The formula for an ionic compound is determined by balancing the charges of the ions involved. In the case of lithium oxide, the lithium ion (Li1+) has a charge of +1, and the oxide ion (O2–) has a charge of -2. To achieve charge balance, the number of positive charges must equal the number of negative charges.

Since the lithium ion has a charge of +1, it takes two lithium ions (2 × +1 = +2) to balance the -2 charge of the oxide ion. Therefore, the formula for lithium oxide is Li2O. In this compound, the subscript "2" indicates that there are two lithium ions present, and "O" represents a single oxide ion.

Options 2 (LiO2) and 3 (Li2O2) are incorrect because they do not balance the charges. Option 4 (LiO) would imply that there is one lithium ion and one oxide ion, which does not fulfill the requirement of charge balance.

Hence, the correct formula for the ionic compound lithium oxide is Li2O.

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Answer:

Option C - 1 mole

a) no of moles of solute = 4.1×0.05

moles = O.205

so the mass of of sodium chloride present is 0.205×58.44

Mass of NaCl = 11.98 g

b) no of moles of solute = 1.8×0.01= 0.018

so the mass of of sodium chloride present is 0.018×58.44

Mass of NaCl = 1.05g

C) number of moles of solute is 1 mole

mass of solute is =58.44g

d) mass =9.35g

So the conclusion is that 1 mole is the correct answer!!!!

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{12}{6} \\ \)

We have the final answer as

Hope this helps you

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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A material that weight 8 grams and takes up 2 cubic centimeters of space has a density of 4 g/cm³

To solve this problem the density formula and the procedure that we have to use is:

ρ = m/v

Where:

Information about the problem:

Applying the density formula we get:

ρ = m/v

ρ = 8 g / 2 cm³

ρ = 4 g/cm³

It is the space occupied by a body, it is calculated by multiplying its dimensions, for example: length, height and width.

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Answer:

Acrylonitrile Styrene Acrylate

Mechanical because the 11 branches of chemistry are , Analytical chemistry, Biochemistry, Electrochemistry, Environmental,  Inorganic chemistry, Organic chemistry, Physical Chemistry, Polymer chemistry Thermochemistry, Theoretical chemistry, and Lastly Chemistry.

Mechanical Chemistry is not a branch of chemistry.

Traditionally, chemistry has been broken into five main subdisciplines: Organic, Analytical, Physical, Inorganic and Biochemistry.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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The mass number of the mystery element is 14.

This is calculated by adding the number of protons and neutrons together, which in this case is 7 + 7 = 14.
The atomic mass number is the amount of protons and neutrons in an atom's nucleus. The atomic number of an element is the number of protons in its nucleus. As a result, the atomic number determines the chemical properties of an element.

The number of protons in an element's nucleus, which is the atomic number, remains the same for all atoms of the same element. On the other hand, the atomic mass of an element is the sum of the number of protons and neutrons in the nucleus of the atom.

Hence ,The atomic mass number of the mystery element with 7 protons, 7 neutrons, and 7 electrons is 14.

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The mass of the glass is 1 gram.

What is specific heat capacity?

 This refers to the amount of heat in joules (J) absorbed per unit mass (kg) of the material when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

From the question:

cp= 0.20 cal/(g°C)

T = 150°C

heat added = 30 cal

To find the mass of the glass, you can use the formula:

mass = heat added / (specific heat capacity x temperature change)

Substituting the given values:

mass =           30 cal

              (0.20 cal/(g°C) x 150°C)

mass =             30

                 (0.20 x 150)

mass       = 30

                  30

mass = 1 g

Hence, the mass of the glass is 1 gram.

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Answer:

The elements of groups 13, 14, 15, 16, 17, 18 are called p block elements.examples: boron (B), aluminium (Al), gallium (Ga), indium (In), thallium (Tl),and so on

Explanation:

The given problem involves calculating the pH of an acid mixture that contains two weak acids, HCIO and H2O2.

To calculate the pH of the solution, we need to first determine the concentrations of H+ and the conjugate base of each acid at equilibrium. We can then use the equilibrium constant expressions for each acid to relate the concentrations of H+, the conjugate base, and the acid.Once we have the concentrations of H+ and the conjugate base of each acid, we can use the equation for the acidic dissociation constant (Ka) to calculate the pH of the solution.

This requires knowledge of the relationship between pH, the concentration of H+, and the logarithmic scale.The final answer will be the pH of the acid mixture.Overall, the problem involves applying the principles of acid-base equilibria to calculate the pH of a solution containing two weak acids. It requires an understanding of the acidic dissociation constant, equilibrium constant expressions, and the properties of weak acids.

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Answer:

Explanation:

Earthquakes are normally caused by underground rock breaking along a fault line. The seismic waves that cause the earth to shake are caused by this sudden release of energy. The plates or blocks of rock begin to move during and after the earthquake, and they continue to move until they become trapped again. As fluid near the center heats up, convection currents develop within the Earth's mantle. Particles pass more quickly as the core heats the bottom layer of mantle material, lowering its density and allowing it to rise. The convection current is started by the growing material.

A DOUBLE REPLACEMENT reaction, is a chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding affiliations.

Explanation:

Double replacement reactions have two ionic compounds that are exchanging anions or cations. Precipitation reactions and neutralization reactions are two common types of double replacement reactions.

Answer :

A double replacement reaction is a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds.

General form :

AB + CD → AD + CB

Explanation:

Isotope of phosphorus containing 19 neutrons can represented as ²⁴₁₅P.

Isotopes are those atoms of the same elements that have same number of protons or same atomic number but different mass  number.

Atomic number = number of protons in the atom = number of electrons in the neutral atom

Mass number = number of protons + number of neutrons

Mass number is represented as Z

Atomic number is represented as A.

While writing the symbol of an atom the mass number is written on the left and side and as a superscript to the symbol of the atom and atomic number is written to the left and as a subscript to the symbol.

Based on what we did and learned in today's lab, we can predict that when 1-propanol is mixed with distilled water, the mass and volume will be conserved.

This is because 1-propanol and water are both liquids and when they are mixed together, they will form a homogeneous solution. A homogeneous solution is a mixture of two or more substances that have a uniform composition and appearance throughout the entire mixture.

The mass of the solution will be the sum of the masses of the two liquids, and the volume of the solution will be the sum of the volumes of the two liquids. Therefore, the mass and volume will be conserved in this case.

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Answer:

Agree

Explanation:

Answer:

Agree

Explanation: