Putting your ear to a wall will allows you to hear the noise the other side better than through the air. (True or False) Explain?​

Answer:

N₂ + 3H₂ → 2NH3

4Fe + 2Cl₂ → 4FeCl

Explanation:

This equations are now balanced

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the pH of the aqueous solution is 8.51 with a hydrogen ion concentration of [H+]=3.1×\(10^-9\)M

The pH of the aqueous solution can be calculated using the formula:

pH = -log[H+]

where [H+] is the hydrogen ion concentration of the solution.

Substituting the given value, we get:

pH = -log(3.1×\(10^-9\))

pH = 8.51

An aqueous solution is one in which water serves as the solvent. It is utilised in a variety of applications, including analytical chemistry, biochemistry, and industrial chemistry. It is the most prevalent kind of solution used in chemical reactions. Water serves as both the solvent and the solute in an aqueous solution, where the solute is often a solid, liquid, or gas. Due to its high polarity and capacity to make hydrogen bonds with other molecules, water is an excellent solvent that can dissolve a variety of materials, including polar molecules and ionic compounds. Acid-base reactions, redox reactions, and precipitation reactions are just a few of the numerous chemical processes that take place in aqueous solutions. A variety of variables can have an impact on an aqueous solution's characteristics.

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The venom of a snake, the horns of cattle, the wax-producing glands of bees, and the bright plumage of birds all are physical adaptations that increase an organism's chances of physically defending itself.

Physical adaptations do develop over many generations. The shape of a bird's beak, the thickness or thinness of the fur, and the shape of the nose or ears are examples of physical adaptations.

Adaptation can be described as a characteristic that provides defense for an animal to survive in its habitat. All animals should be able to get food and water, protect themselves from harm, and climate, and reproduce young species.

Horns and antlers can be used to protect themselves, fight for territory, or to attract a mate. The leaves are coated in the wax which reduces water loss and stops the plant from drying out. Some butterflies and birds have bright, vivid colors that provide them stand out from their surroundings and serve as a warning to predators.

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The attached graphic displays the enthalpy diagram for the combustion of cyclopropane.

The enthalpy diagram for a combustion reaction typically displays the change in reaction enthalpy (H) throughout the reaction route.

An enthalpy diagram normally has two sides: the reactant side and the product side. Reactant species like gasoline or hydrocarbons have a higher enthalpy on the reactant side when compared to the products. As the reaction gets nearer to the products, the enthalpy decreases.

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To determine the hardness of the water sample prepared by dissolving 1.02 grams of CaCl2 in 750 ml distilled water, we need to calculate the concentration of calcium ions (Ca2+) in the solution, since hardness is usually defined as the concentration of calcium and magnesium ions in water.

The molar mass of CaCl2 is 110.98 g/mol, so 1.02 g of CaCl2 represents:

1.02 g / 110.98 g/mol = 0.00918 mol

When CaCl2 dissolves in water, it dissociates into two ions of Ca2+ and two ions of Cl-. Therefore, the number of moles of Ca2+ ions in the solution is:

0.00918 mol CaCl2 x (1 mol Ca2+ / 1 mol CaCl2) = 0.00918 mol Ca2+

The volume of the solution is 750 ml, which is equivalent to 0.75 L. Therefore, the concentration of Ca2+ ions in the solution is:

0.00918 mol / 0.75 L = 0.0122 M

Finally, we can convert the concentration to units of hardness, which is usually expressed in terms of milligrams of CaCO3 per liter (mg/L). The conversion factor is:

1 mmol CaCO3/L = 100 mg CaCO3/L

Since the molar mass of CaCO3 is 100.09 g/mol, we can calculate the hardness as:

0.0122 mol/L x (1000 mmol/mol) x (100 mg CaCO3/mmol) = 122 mg/L

Therefore, the hardness of the water sample prepared by dissolving 1.02 grams of CaCl2 in 750 ml distilled water is 122 mg/L.

To name this ion, we need to follow up the steps:

Step 1: F is the symbol for fluorine.

Step 2: For anions, change the ending to -ide and add the word ion after it. Since it is an anion, drop the -ine and replace it with -ide.

Therefore, this is a fluoride ion.

The volume of the water is  5.11 mL.

Density is a measure of mass per unit of volume of a substance. It is a physical property of matter and is expressed in units of grams per cubic centimeter (g/cm^3).

The density of a substance determines how much of it will occupy a given space, and is a crucial factor in many physical and chemical phenomena, such as buoyancy, phase changes, and thermal conductivity.

We have that;

Volume of the water = ?

Density of the water = 0.9960 g/mL

Mass of the water = 5.097 g

Volume of the water = Mass/Density

= 5.097 g / 0.9960 g/mL

= 5.11 mL

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Answer:

its sodium hydroxide

Explanation:

Answer:

H2SO4 AND NH3

Explanation:

I hope it will help you

Answer:

Explanation:

H2SO4 AND NH3

Answer:

A. It secretes hormones that regulate blood sugar levels.

Explanation:

The pancreas is the organ that helps in the process of digestion of the food. The location of the pancreas is in the abdomen. It helps in the process of digestion of the food and regulating the blood sugar level in the body. It helps in regulating and controlling the glucose level in the body during the process of digestion. Pancreas produces enzymes that are useful in the process of digestion.

Answer:

A

Explanation:

Answer:

C. Chemical change

Explanation:

A physical change is where something is changed but it doesnt affect the build up of the chemical. For example, if you broke sticks and threw them on the ground, that would be a physical change because the change is happening to the physical being of the object and not its chemical buildup. However, if you lit those sticks on fire, that would be considered a chemical change because you end up with two substances, ash and the remnants of the stick. A nuclear reaction would result in something blowing up so its not that. And a physical property is like what it looks like or how it smells. Hope I helped you!

Answer:

\(\boxed {\boxed {\sf 7.89*10^{-4} \ mol \ Pb}}\)

Explanation:

To convert from moles to atoms, we must use Avogadro's Number. Avogadro's Number

1. Set up ratio

We can use Avogadro's Number as a fraction or ratio.

\(\frac{6.022*10^{23} \ atoms \ Pb}{1 \ mol \ Pb}\)

2. Convert atoms to moles

Multiply the given number of atoms by the ratio.

\(4.75 *10^{20} \ atoms \ Pb *\frac{6.022*10^{23} \ atoms \ Pb}{1 \ mol \ Pb}\)

Flip the fraction so that the atoms of lead can cancel each other out.

\(4.75 *10^{20} \ atoms \ Pb *\frac{1 \ mol \ Pb}{6.022*10^{23} \ atoms \ Pb}\)

\(4.75 *10^{20} *\frac{1 \ mol \ Pb}{6.022*10^{23} }\)

\(\frac{4.75 *10^{20} \ mol \ Pb}{6.022*10^{23} }\)

\(7.88774494*10^{-4} \ mol \ Pb\)

3. Round

The original measurement of 4.75 had 3 significant figures (4, 7, and 5).

We must round our answer to 3 sig figs, which is the hundredth place for the number found.

\(7.88774494*10^{-4} \ mol \ Pb\)

The 7 in the thousandth place tells us to round the 8 up to a 9 in the hundredth place.

\(7.89*10^{-4} \ mol \ Pb\)

There are 7.89*10⁻⁴ moles of lead in 4.75*10²⁰ atoms of lead.

The correct answers to the fill in the blank problems given above are as follows:

Mitotic phase is the part of the cell cycle that divides the material

This process happens only in somatic cells, also is known as body cells.

There are 4 parts of this process:

Mitosis can simply be defined as a special process of cell division in which a single cell divides into two different identical daughter cells.

Aside, mitosis; another major cell division which occurs in the cells of living organisms is the meiosis. Below are the phases involved in mitotic cell division, these are as follows:

In conclusion, it can be deduced from the explanation given above that mitosis is a process of cell division.

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Answer:

The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge.

Best example of a new substance being formed is the reaction between hydrogen gas and oxygen gas to form water.

In this reaction, two hydrogen molecules (H₂) react with one oxygen molecule (O₂) to form two water molecules (H₂O). The resulting substance, water, has entirely different properties from its constituent elements. For example, water is a liquid at room temperature, while both hydrogen and oxygen are gases.

Water also has different chemical and physical properties, such as boiling point, melting point, density, and solubility. These changes in properties indicate that a new substance with a different chemical composition has been formed. The process of hydrogen and oxygen reacting to form water is an example of a chemical reaction, which involves the breaking and forming of chemical bonds between atoms to create new substances.

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Answer:

true

Explanation:

The digestive tract is made up of organs that food and liquids travel through when they are swallowed, digested, absorbed, and leave the body as feces. These include the mouth, pharynx (throat), esophagus, stomach, small intestine, large intestine, rectum, and anus.

Answer:

decrease.

Explanation:

WHY? - As you go across a period, electrons are added to the same energy level. ... The concentration of more protons in the nucleus creates a "higher effective nuclear charge." In other words, there is a stronger force of attraction pulling the electrons closer to the nucleus resulting in a smaller atomic radius.

Answer:

1.16 as a ratio and 1.1 as difference.

Explanation:

Hello there!

In this case, since the pH stands for the relative strength of the hydrogen ions in a solution, it is widely known that the pH of the ocean is about 8.1 due to the dissolved HCO3^- ions dissolved in it. On the other hand the pH of pure water is known as 7.0 as the only neutral solution.

Thus, by dividing the pH of the ocean by the pH of the pure water, we can calculate the units or ratio between them:

\(\frac{8.1}{7.0} \\\\=1.16units\)

Or also the difference separating them:

\(8.1-7.0=1.1\)

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Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer:

...

Explanation:

The balanced nuclear equation for the beta decay of 234/90Th can be represented as follows: ^234/90Th --> ^234/91Pa + e^0/-1β

In this equation, the nucleus of thorium-234 (234/90Th) undergoes beta decay. During beta decay, a neutron within the nucleus is converted into a proton, resulting in the emission of an electron (beta particle). As a result, the thorium-234 nucleus is transformed into protactinium-234 (234/91Pa) by gaining one proton.

The beta particle emitted during the decay process is represented as e^0/-1β, where the superscript 0 denotes that the electron has no charge (neutral), and the subscript -1 indicates that the electron carries a negative charge of -1.

It is important to note that in a nuclear equation, the total atomic mass and atomic number on both sides of the equation must be equal to maintain a balanced equation and conserve mass and charge.

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Answer:

Option C

Explanation:

The equation for showing gravitational pull or force between two objects is as follows -

\(G_f = \frac{G M_1M_2}{r^2}\)

Here Gf is the gravitational force

G is the gravitational constant and

M1 and M2 is the mass of the two objects

As we can see in the equation, that mass of two objects is directly proportional to the gravitational pull between them.

The higher the mass, the higher will be the force.

While on the other hand the distance between the two objects i.e "r" is inversely proportional. The higher the distance between the two objects the lower is the gravitational force between them.

Hence, option C is correct

Answer:

A ---->gamma ray

Explanation:

Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.