What chemical changes were responsible for the color changes? (While doing a red cabbage juice lab and finding out if substances were acid,base, or neutral based on what color they turned)

Answer:

Answer is C

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The correct answer is

The particles in a gas are attracted to each other.

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The following is NOT an assumption of the kinetic theory of gases :  The particles in a gas are attracted to each other.

Kinetic Molecular Theory (KMT) states that a gas consists of molecules that move at a constant and random speed. The collisions between molecules are perfectly elastic so that no energy is wasted.

The molecules move in straight lines until they collide

Energy because this motion is expressed as Kinetic energy (KE) which can be formulated as:

 [tex] \displaystyle KE = \frac {1} {2} mv ^ 2 [/tex]

The average kinetic energy value is only affected by temperature changes. The higher the temperature, the average kinetic energy of the molecule increases

This molecule is very small when compared to the distance between molecules, so the volume of gas contains mostly empty space

Gas particles move randomly (both speed and direction, as vector)

From the question :

Particle motion creates kinetic energy.

they collide between particles or the walls of its container

The volume of the individual particles is negligible

The motion of each particle is independent (no attraction or repulsion)

The collisions are elastic, so there is no loss of kinetic energy, only transferred from between particles

inertia affect during a collision  

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Henry's Law  

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ideal gas  

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Keywords: Kinetic Molecular Theory, Collisions, The average kinetic energy , gas molecule

Answer:

b

It's the only one that would oppose to the student

Explanation:

The mountain ranges like the Himalayas, where Mt. Everest is situated, and other bigger peaks are the outcomes of plate tectonics, resulting mainly due to huge slabs of Earth's crust colliding with each other. The point where collision takes place is known as a subduction zone, in which one of the subducts or slabs goes underneath, and the other gets on the top. When such kind of phenomenon take place, the push of one slab against the other, and the friction resulting on both the slabs lead to the formation of mountain ranges with the peaks like of Mt. Everest.

Earth's atmosphere is primarily composed of nitrogen and oxygen. Nitrogen accounts for about 78% of the atmosphere and oxygen makes up approximately 21%. The rest is made up of argon and trace gases like carbon dioxide and water vapor.

Presently, Earth's atmosphere is dominated by nitrogen (N₂) and oxygen (O₂). Nitrogen makes up about 78% of the atmosphere, while oxygen accounts for around 21%. The remaining 1% consists of gases such as argon, with trace amounts of carbon dioxide, water vapor, and other gases. These percentages refer to the volume mix in the air at Earth's surface. This is a significant shift from early in the Earth's history, when the atmosphere was dominated by carbon dioxide (CO2) and hydrogen-containing gases. That initial chemical composition changed over time due to processes like photosynthesis, which resulted in the release of oxygen, and the effects of solar ultraviolet light, which caused lighter hydrogen atoms to escape from Earth.

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Answer:

Oxygenation Nitrite

Explanation:

Elements with similar properties are located in the same column of the periodic table, as these elements have the same number of valence electrons, which determine their chemical properties.

Elements with similar properties are found in the same column of the periodic table. This is due to the fact that elements in the same column (also known as a group) have the same number of electrons in their outermost energy level, also known as valance electrons. These valance electrons determine an element's chemical properties. For example, Group 18 elements, or noble gases, all have a complete set of electrons in their outermost shell, making them extremely stable and unreactive.

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Answer:

It's B!

Explanation:

Hello!

If 3 grams of reactants were consumed, then C) 3 grams of rust must be produced.

There are two possible chemical reactions between iron and oxygen to form rust:

These two chemical reactions obey the Law of Conservation of Matter, which states that matter is conserved in a chemical reaction.

So, if there are 3 grams of reactants initially, and they react completely, then 3 grams of rust (either Ferrous Oxide or Ferric Oxide) must be produced for the reaction to obey the Law of Conservation of Matter.

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Final answer:

When an atom loses one electron, it becomes a positively charged ion, known as a cation, with a +1 charge due to more protons than electrons.

Explanation:

When an atom loses one electron, the charge on its ion becomes positively charged. This occurs because there are now more protons than electrons in the ion. Atoms that lose electrons are referred to as cations. For example, when a neutral sodium atom loses one electron, it transforms into Na+, which signifies a cation with a +1 charge. The loss of electrons results in a higher number of protons than electrons, leading to a positive charge on the resulting ion, making sodium a cation, Na+, with a +1 charge. This process is essential for forming ions in chemistry, as ions are atoms that have gained or lost electrons, resulting in an imbalance that gives them a net charge.

Answer:

1) Conservation of Matter states that the reactants have to equal the products.

2) Products and reactants in a balanced chemical reaction have the same number of atoms of each element.

3) Three (3) atoms of carbon would need to be represented.

Explanation:Number of atoms on the left and on the right side of the balanced chemical reaction is the same, for example: Mg + 2HCl → H₂ + MgCl₂. There are two hydrogen atoms, two chlorine atoms and one magnesium atom on both side of chemical reaction.

1. Conservation of Matter states that the reactants have to equal the products.

2. Products and reactants in a balanced chemical reaction have the same number of atoms of each element.

3. If the equation on the board had shown 3 atoms of carbon on the reactants side, then there would need to be 3 atoms of carbon on the products side.

Conservation of Matter is a law of science that states that matter cannot be created or destroyed. This means that the total mass of the reactants in a chemical reaction must equal the total mass of the products.

Atoms are the basic unit of matter. A molecule is a group of atoms that are bonded together.

In a balanced chemical equation, the number of atoms of each element is the same on the reactant side and the product side. This is because the law of conservation of matter must be obeyed.

So, if the equation on the board had shown 3 atoms of carbon on the reactants side, then there would need to be 3 atoms of carbon on the products side in order for the equation to be balanced.

Here is an example of a balanced chemical equation:

2 H₂ + O₂ → 2 H₂O

In this equation, there are 2 hydrogen atoms on the reactant side and 2 hydrogen atoms on the product side. There is also 1 oxygen atom on the reactant side and 1 oxygen atom on the product side. This is a balanced equation because the law of conservation of matter is obeyed.

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Screws have phenomenal tensile strength which is far greater than nails. Screws build a tight adhesion between two pieces of wood.  

Nails are used for joints, because even after multiple twists the wood at the joints will remain together when nails are used. But a screw will come off after a single twist, if screws are used to hold wood at the joints.  

For any static wood work screws are better than nails because of their tensile strength.  

When the balanced equation for this reaction is:

2Fe + 3H2O → Fe2O3 + 3H2

and according to the formula for vapor pressure:

PV = nRT

when we have P is the vapor pressure H2O = 0.121 atm

and V is the volume of H2O = 4.5 L

and T in Kelvin = 52.5 +273 = 325.5 K

R = 0.08205 atm-L / g mol-K

So we can get H2O

So, with substitution:

n H2O = PV / RT

= (0.121 * 4.5) / (0.08205 * 325.5) = 0.02038 g/mol

n Fe2O3 = 0.02038 * (1Fe2O3 / 3H2O) = 0.00679 g/mol

Note: we get the ratio (1FeO3 / 3H2O) of the balanced equation.

we can get Fe2O3 Mass from this formula:

Mass = number of moles * molecular weight

we have a molecular weight of Fe2O3 = 159.7

= 0.00679 * 159.7 = 1,084 g

So, 1,084 grams will produce Fe2O3

The chemical reaction in the event of chemical change from substances that react (reactants) into substances that result from reactions (products). In chemical reactions, new substances are always produced with new properties. Chemical reactions are written using the element symbol. Let's look at how to express a reaction using symbols.

Material conservation law states that in ordinary chemical reactions no material is lost even though it might change. The number of atoms in reagents must remain the same as those produced, however, they change to form new molecular patterns. If an equation fulfills the conditions, it can be said that the equation is balanced.

Characteristics of Chemical Reactions

When a chemical reaction occurs, there are changes that we can observe. Consider the following characteristics of a chemical reaction.

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Grade: High School

Subject: Chemistry

keywords: The chemical reaction

Final answer:

The molarity of the HCl solution is determined by using the volume and molarity of Ba(OH)2 to find the moles of HCl neutralized, which in this case results in a molarity of 0.01061 M for the HCl solution.

Explanation:

To calculate the molarity of the HCl solution, we will use the data provided from the titration of Ba(OH)2 with HCl. We are given that 25.9 mL of 3.4 x 10-3 M Ba(OH)2 completely neutralized 16.6 mL of HCl solution.

First, we calculate the number of moles of Ba(OH)2:

# moles Ba(OH)2 = Volume (L) x Molarity = (0.0259 L) x (3.4 x 10-3 M) = 8.806 x 10-5 moles

The balanced chemical equation for the reaction is:

Ba(OH)2 + 2 HCl → BaCl2 + 2 H2O

From the equation, we see that 1 mole of Ba(OH)2 reacts with 2 moles of HCl. Therefore, the moles of HCl neutralized by Ba(OH)2 would be twice the number of moles of Ba(OH)2, which is 2 x 8.806 x 10-5 = 1.7612 x 10-4 moles.

Now, we can find the molarity of the HCl solution:

Molarity HCl = # moles HCl / Volume HCl (L) = 1.7612 x 10-4 moles / 0.0166 L = 0.01061 M

The method of heat transfer that will be the fastest in vacuum is radiation, in gas is convection and in solid is conduction.

There are three modes of heat transfer, they include;

The method of heat transfer that will be the fastest in gas is convection. Heat transfer by convection involves that actual movement of the particles of the fluid. The average distance between gas molecules are large which enables fast and easy transfer of heat through the movement of the molecules.

The method of heat transfer that will be the fastest in vacuum is radiation. Heat transfer by radiation does not require material medium. Vacuum is the best medium for heat transfer by radiation.

The method of heat transfer that will be the fastest in solid is conduction. Heat transfer by conduction involves the vibration of the solid particle about their mean position.

Thus, we can conclude that the method of heat transfer that will be the fastest in vacuum is radiation, in gas is convection and in solid is conduction.

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The question is incomplete, here is the complete question:

A solution is made by mixing 45.0 mL of ethanol, [tex]C_2H_6O[/tex], and 55.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?

Constants @ 20°C:  

ethanol = 0.789 g/mL (Density) & 43.9 Torr (Vapor Pressure)

water = 0.998 g/mL (Density) & 17.5 Torr (Vapor Pressure)

Answer: The vapor pressure of the solution at 20°C is 23.4 Torr

Explanation:

To calculate the mass of substance, we use the equation:

[tex]\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}[/tex]     ......(1)

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]     .....(2)

Mole fraction of a substance is given by:

[tex]\chi_A=\frac{n_A}{n_A+n_B}[/tex]     ......(3)

Density of ethanol = 0.789 g/mL

Volume of ethanol = 48.0 mL

Putting values in equation 1, we get:

[tex]0.789g/mL=\frac{\text{Mass of ethanol}}{48.0mL}\\\\\text{Mass of ethanol}=(0.789g/mL\times 48.0mL)=37.9g[/tex]

Given mass of ethanol = 37.9 g

Molar mass of ethanol = 46 g/mol

Putting values in equation 2, we get:

[tex]\text{Moles of ethanol}=\frac{37.9g}{46g/mol}=0.824mol[/tex]

Density of water = 0.998 g/mL

Volume of water = 52.0 mL

Putting values in equation 1, we get:

[tex]0.998g/mL=\frac{\text{Mass of water}}{52.0mL}\\\\\text{Mass of water}=(0.998g/mL\times 52.0mL)=51.9g[/tex]

Given mass of water = 51.9 g

Molar mass of water = 18 g/mol

Putting values in equation 2, we get:

[tex]\text{Moles of water}=\frac{51.9g}{18g/mol}=2.88mol[/tex]

Calculating the mole fractions by using equation 3:

Mole fraction of ethanol, [tex]\chi_{ethanol}=\frac{n_{ethanol}}{n_{ethanol}+n_{water}}=\frac{0.824}{0.824+2.88}=0.222[/tex]

Mole fraction of water, [tex]\chi_{water}=\frac{n_{water}}{n_{ethanol}+n_{water}}=\frac{2.88}{0.824+2.88}=0.778[/tex]

To calculate the total pressure of the mixture of the gases, we use the equation given by Raoult's law, which is:

[tex]p_T=\sum_{i=1}^n(p_{i}\times \chi_i)[/tex]

[tex]p_T=(p_{ethanol}\times \chi_{ethanol})+(p_{water}\times \chi_{water})[/tex]

Putting values in above equation, we get:

[tex]p_T=(43.9\times 0.222)+(17.5\times 0.778)\\\\p_T=23.4Torr[/tex]

Hence, the vapor pressure of the solution at 20°C is 23.4 Torr

Atom is the smallest unit of any element which can participate in a chemical reaction. Each atom of any element contains a central nucleus and outer shells

the central nucleus contains positive protons and neutral neturons

The outer part of nucleus has shells. These shells are occupied by electrons.

so the model must be a representation of how electrons are distributed in the shells of an iron atom

Answer: 1. convergent :This plate boundary usually forms mountains due to colliding plates.

2. divergent :This plate boundary creates new land, like the seafloor at the mid-atlantic ridge.

3.transform :This plate boundary can cause earthquakes from plates rubbing along side each other.

Explanation:

Convergent boundaries are the areas on the surface of the Earth where two or more lithospheric plates collides. One of the late slides beneath the other making area highly prone to earthquakes.

Divergent boundaries are the areas on the surface of the Earth where two tectonic plates moves away from each other.Due this movement of plates a ridge is created like sea floor at the mid-Atlantic ridge.

Transform are the area on the surface of the Earth where two plates slides away past to each other due to which gives rise to  earthquakes.

Answer : The rate of effusion of helium gas is four times of the rate of effusion of sulfur dioxide gas.

Solution : Given,

Molar mass of sulfur dioxide gas = 64 g/mole

Molar mass of helium gas = 4.0 g/mole

According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.

[tex]R\propto \sqrt{\frac{1}{M}}[/tex]

or,

[tex]\frac{R_1}{R_2}=\sqrt{\frac{M_2}{M_1}}[/tex]

where,

[tex]R_1[/tex] = rate of effusion of sulfur dioxide gas

[tex]R_2[/tex] = rate of effusion of helium gas

[tex]M_1[/tex] = molar mass of sulfur dioxide gas

[tex]M_2[/tex] = molar mass of helium gas

Now put all the given values in the above formula, we get

[tex]\frac{R_1}{R_2}=\sqrt{\frac{4.0g/mole}{64g/mole}}[/tex]

[tex]\frac{R_1}{R_2}=\frac{1}{4}[/tex]

Therefore, from this we conclude that, the rate of effusion of helium gas is four times of the rate of effusion of sulfur dioxide gas.