What of the following is made out of atoms? (HINT: vocabulary word "atom" or "matter") * 1 Air
2 Light
3 Energy
4 Sound

Some types of solids that are insoluble in water are:

Many solids are insoluble in water, meaning they do not dissolve in water to a significant extent. Here are some examples of common solids that are generally insoluble in water:

Metals: Most metals, such as gold, silver, platinum, and copper, are insoluble in water.

Non-Metallic Elements: Many non-metallic elements, such as carbon (in the form of graphite or diamond), sulfur, phosphorus, and iodine, are insoluble in water.

Metal Oxides: Some metal oxides, particularly those of less reactive metals, are insoluble in water. Examples include aluminum oxide (Al2O3), iron(III) oxide (Fe2O3), and lead(II) oxide (PbO).

Metal Carbonates: Most metal carbonates are insoluble in water. Examples include calcium carbonate (CaCO3), lead(II) carbonate (PbCO3), and copper(II) carbonate (CuCO3).

Metal Sulfides: Many metal sulfides are insoluble in water. Examples include lead(II) sulfide (PbS), silver sulfide (Ag2S), and mercury(II) sulfide (HgS).

Insoluble Salts: Certain salts have limited solubility in water. Examples include silver chloride (AgCl), lead(II) iodide (PbI2), and calcium sulfate (CaSO4).

It's important to note that while these solids are generally insoluble in water, they may exhibit some solubility to a small extent. The solubility of a solid in water can vary depending on factors such as temperature, pressure, and the presence of other solutes.

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Drift nets are a problem because when they are lost in the sea, they may continue to kill many animals.

This is referred to as a fishing technique where nets, called drift nets, hang vertically in the water column and are arranged to drift with the tide or current  without being anchored to the bottom.

In a situation whereby they are lost or left,  they may continue to kill many animals in what is referred to as ghost fishing which may lead to overexploitation and a disruption in the ecosystem thereby making it the correct choice.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer:

All of them are organic compounds which have carbon as their main atom in the structure.

Explanation:

Hello.

In this case, since organic chemistry is the study of all the compounds having the carbon atom as their main atom, all the vegetables, animals, an in general, living things are composed by lipids, proteins, and other organic substances with this feature. Moreover, wood-based materials are mainly composed by lignin which is an organic polymer also having carbon as the main atom. In addition, oil and gasoline are organic chemical compounds with a lot of applications in daily life which also contain carbon atoms in their structure.

In such a way, a celery, a wooden spoon, and oil/gasoline have the carbon atom in common as their main atom in their chemical structures.

Best regards.

Because NH3 molecules in the liquid phase require energy to overcome their intermolecular interactions and transform into free gas molecules, this expression reads NH3(l)— NH3(g). Heat is transferred from the environment to the system during phase shifts.

Ammonia has the chemical formula NH3 and is a colourless gas.Nitrogen and hydrogen make up its composition. Its name in aqueous form is ammonium hydroxide. This inorganic substance smells strongly. It is hazardous and corrosive in its concentrated form. Ammonia has a density of 0.769 kg/m3 at STP, making it lighter than air. It is frequently employed as fertiliser. Additionally, it is employed in the production of explosives like TNT and nitrocelluloseAdditionally, it is employed in the manufacture of soda ash and the Ostwald process to produce nitric acid. A strong alkali, such as sodium hydroxide or calcium hydroxide  2NH4Cl + Ca(OH)2 → CaCl2 + 2H2O + 2NH3(g) is heated with an ammonium salt, such as ammonium chloride NH4Cl, to produce ammonia (g)

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Explanation:

The theoretical yield of our reaction is 1.50 moles, the actual yield of aluminum oxide is 0.885 moles. The percent yield is:

percent yield = actual yield/theoretical yield * 100 %

percent yield = 0.885 moles/(1.50 moles) * 100 %

percent yield = 59.0 %

Answer: The percent yield is 59.0 %.

Answer:

P.E for the 4kg bowling ball held 2.5 meters above head is 100j, while the other is 60j so the 4kg ball has more potential energy

Answer:

C 108

Explanation:

1 It was found that 4n atoms of metal x

weigh 501.6 g. The relative atomic mass

of X is 209. If n atoms of another metal,

Y, weigh 65.00 g, what is the relative

atomic mass of metal Y?

A 27 B 52 C 108 D 137

if 4n atoms of x weigh 501.6 gm, the n atoms weigh 501.6/4 = 125.4 gms

since the atomic mass is 209, then 6.022 X10^23 atom weigh 209

the ratio of 125.4 to 209 is

125.4/Y =0.6

therefor n is the number of atom in 0.6 moles

if metal Y has the same, number of atoms "n"  and weighs 65 gm

then then the relative atomic mass is

65/0.6 =108

so the answer is

C 108

One of the most extensively researched areas of homogeneous catalysis is homogeneous hydrogenation. These investigations' findings have proven to be crucial for comprehending the fundamental ideas behind how transition metal complexes activate tiny molecules.

Homogeneous hydrogenation has been widely used in organic chemistry during the past three decades, including the manufacture of significant medicines, particularly in situations where a high level of selectivity is required.This book provides an overview of the fundamental ideas and practical uses of transition metal complex-mediated homogeneous hydrogenation. The methods by which these activities take place are given special consideration, and the function of the recently found complexes of molecular hydrogen is outlined. Other than H2 sources of hydrogen are also taken into consideration (transfer hydrogenation).

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The capacity of an object is measured by its volume. For instance, a cup's capacity is stated to be 100 ml if it can hold 100 ml of water in its brim. Here ice cube has particles that can be drawn closer to occupy smaller volume. The correct option is D.

Due to the strong intermolecular interactions, the solid molecules are very near to one another. Solids have a low volume and a high density as a result. Additionally, the solid molecules cannot be easily crushed due to the narrow intermolecular distance.

So here ice cube has small volume.

Thus the correct option is D.

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Answer: 24.356L/mol.

Explanation: Hence, the average experimental volume per mole of carbon dioxide for sodium carbonate and sodium bicarbonate is 24.356L/mol.

Answer:

1.68 mol Ca(NO₃)₂

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

[Given] 275 g Ca(NO₃)₂

[Solve] mol Ca(NO₃)₂

Step 2: Identify Conversions

[PT] Molar Mass of Ca: 40.08 g/mol

[PT] Molar Mass of N: 14.01 g/mol

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

Molar Mass of Ca(NO₃)₂: 40.08 + 2[14.01 + 3(16.00)] = 164.10 g/mol

Step 3: Convert

Step 4: Check

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

1.67581 mol Ca(NO₃)₂ ≈ 1.68 mol Ca(NO₃)₂

Answer:

1.68 mol Ca(NO₃)₂

Explanation:

The moles of NaOH used is 0.0008 moles

The molarity of the acid  is 0.008 M

The molarity of the acid is found as follows:

Moles of NaOH used = concentration of NaOH × volume of NaOH used

the average volume of NaOH used = 8.0 mL

moles of NaOH = 0.1 M × 8.0 mL

moles of NaOH = 0.0008 moles

Molarity of acid:

Assuming the acid is monobasic, the mole ratio of acid to base is 1 : 1

The volume of acid used is 100 mL

The molarity of acid = moles of acid / volume of acid in liters

The molarity of acid = 0.0008 moles / 0.1 L

The molarity of acid  = 0.008 M

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Answer:

B

Explanation:

it is filled with energy so it's high

Answer:

The chemical compounds found in this reaction are: sodium, magnesium and fluorine.

Explanation:

The chemical compounds of the reaction are expressed in the periodic table as follows:

In the case of sodium, the symbol is "Na"

In the case of fluorine, the symbol is "F"

In the case of Magnesium, the symbol is "Mg"

The main ions present in the electrolytic cell during the electrolysis of 4 mol/L nitric acid are H+, NO3-, OH-, and NO2. Additionally, water (H2O) is also present as the solvent.

Hydrogen ion (H+): When nitric acid dissolves in water, it ionizes to release hydrogen ions, which are positively charged. The chemical symbol for the hydrogen ion is H+.

Nitrate ion (NO3-): Nitric acid also dissociates to form nitrate ions. These ions have a negative charge, and their chemical symbol is NO3-.

Hydroxide ion (OH-): Water molecules can undergo self-ionization, producing hydroxide ions and hydrogen ions. In the presence of water, nitric acid can also lead to the formation of hydroxide ions, OH-.

Nitrogen dioxide (NO2): During the electrolysis process, some nitrate ions may be oxidized at the anode to form nitrogen dioxide gas. The chemical symbol for nitrogen dioxide is NO2.

Water (H2O): Water itself is present in the electrolytic cell. It serves as the solvent and also participates in ionization reactions.

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Answer:

it would be E. because it would create steam from the h2o

The acid-conjugate base pair of the above reaction is HI and I (option D).

A conjugate base is any compound, of general formula Xn+, which can be transformed into a conjugate acid by the gain of a proton.

In other words, a conjugate base is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ion.

The conjugate base is formed from the acid by losing a proton (H+).

Therefore, the acid and conjugate base pair is represented by option D.

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Answer:

What is the speed of an object traveling 50 m in five hours

Explanation:

Taking into account the definition of calorimetry, 0.0185 moles of water are required.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

92.048 kJ = 4.186 \(\frac{J}{gC}\)× m× (100 °C -34 °C)

92.048 kJ = 4.186 \(\frac{J}{gC}\)× m× 66 °C

m= 92.048 kJ ÷ (4.186 \(\frac{J}{gC}\)× 66 °C)

m= 0.333 grams

Being the molar mass of water 18 \(\frac{g}{mole}\), that is, the amount of mass that a substance contains in one mole, the moles of water required can be calculated as:

\(amount of moles=0.333 gramsx\frac{1 mole}{18 grams}\)

amount of moles= 0.0185 moles

Finally, 0.0185 moles of water are required.

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The mass of water used is 50.0-g  and the precise warmness of water (C) is 1.0 cal/g °C. those values will give you the warmth gained in calories. Q = m × C × ∆T = 50.0 g × 1.zero cal/g°C × 5.three °C = 265 cal.

answer °C = 265 cal.

Measurement of heat is finished in energy. One calorie is the quantity of energy required to raise one gram of water one diploma Celsius. To degree heat, you divide the alternate temperature of a sample of water by way of the mass of the water.

Mass is constantly regular for a body. One way to calculate mass is Mass = quantity × density. Weight is the measure of the gravitational force performing on a mass. The SI unit of mass is "kilogram".

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Answer:

Density = 0.17 g/L

Explanation:

It is given that,

Volume of the inflated balloon filled with Helium, \(V=2.2\times 10^3\ L\)

Mass, m = 374 g

We need to find the density of helium. It is equal to its mass per unit volume. It can be given by :

d =m/V

\(d=\dfrac{374\ g}{2.2\times 10^3\ L}\\\\=0.17\ g/L\)

So, the density of helium in the balloon is 0.17 g/L.

The density of the metal is 200.25 g/cm^3.

Explanation:

Answer:

Explanation:

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

From the question we have

\(density = \frac{90}{10} = 9 \\ \)

We have the final answer as

Hope this helps you

Answer: The molar enthalpy change is 73.04 kJ/mol

Explanation:

\(HCl+NaOH\rightarrow NaCl+H_2O\)

moles of HCl= \(molarity\times {\text {vol in L}}=0.415mol/L\times 0.1=0.0415mol\)

As NaOH is in excess 0.0415 moles of HCl reacts with 0.0415 moles of NaOH.

volume of water = 100.0 ml + 50.0 ml = 150.0 ml

density of water = 1.0 g/ml

mass of water = \(volume \times density=150.0ml\times 1.0g/ml=150.0g\)

\(q=m\times c\times \Delta T\)

q = heat released

m = mass  = 150.0 g

c = specific heat = \(4.184J/g^0C\)

\(\Delta T\) = change in temperature = \(4.83^0C\)

\(q=150.0\times 4.184\times 4.83\)

\(q=3031.3J\)

Thus 0.0415 mol of HCl produces heat = 3031.3 J

1 mol of HCL produces heat = \(\frac{3031.3}{0.0415}\times 1=73043.3J=73.04kJ\)

Thus molar enthalpy change is 73.04 kJ/mol

Answer:

C.) Sodium

Explanation:

Sodium is an "Alkali Metal"

Answer:

5 moles of NaCl

Explanation:

Here is the balanced reaction:

2NaOH + BaCl2 -> 2NaCl + Ba(OH)2

1 mole of BaCl2 will produce 2 moles of NaCl

so 2.5 moles of BaCl2 will produce 2.5 x 2 = 5 moles of NaCl

0.498 moles of copper(II) phthalocyanine would be produced by

the complete cyclotetramerization of 255 grams of phthalonitrile in the

presence of excess copper(ll) chloride.

Copper(ll) phthalocyanine (Cu(C₃₂H₁₆N₈)) is produced by the cyclotetramerization of phthalonitrile (C₈H₄N₂) according to the following reaction: 4 C₈H₄N₂(l) + CuCl₂(s) → Cu(C₃₂H₁₆N₈)(s) + Cl₂(g) How many moles of copper(II) phthalocyanine would be produced by the complete cyclotetramerization of 255 grams of phthalonitrile in the presence of excess copper(II) chloride?

Let's consider the following balanced equation.

4 C₈H₄N₂(l) + CuCl₂(s) → Cu(C₃₂H₁₆N₈)(s) + Cl₂(g)

The molar mass of C₈H₄N₂ is 128.13 g/mol. The moles corresponding to 255 g of C₈H₄N₂ are:

\(255 g \times \frac{1mol}{128.13 g} = 1.99 mol\)

The molar ratio of C₈H₄N₂ to Cu(C₃₂H₁₆N₈) is 4:1. The moles of Cu(C₃₂H₁₆N₈) produced from 1.99 moles of C₈H₄N₂ are:

\(1.99 mol C_8H_4N_2 \times \frac{1molCu(C_{32}H_{16}N_8)}{4mol C_8H_4N_2} = 0.498 mol Cu(C_{32}H_{16}N_8)\)

0.498 moles of copper(II) phthalocyanine would be produced by

the complete cyclotetramerization of 255 grams of phthalonitrile in the

presence of excess copper(ll) chloride.

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Answer:it conduct thermal conductivity because of the heat it holds

Explanation:

When energy is transformed from one form to another, the appliance could be redesigned in such a way that this transfer is minimized.

We know from the principle of transfer of energy that energy can neither be created nor destroyed but is transformed from one form to another. The image is not shown here but I will try to explain what energy transfer is.

Usually, when energy is transformed from one form to another, the appliance could be redesigned in such a way that this transfer is minimized.

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