Does changing the number of protons change the identity of the element you have built ?

Answer:

True,When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction.

Answer:

Scientific Question: ... I will boil water and add a substance like salt to see if the boiling point increases.

Answer:

Explanation:

its true

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Answer:

True

Explanation:

Answer:

-Over time, the rates of the forward and reverse reactions equalize.

-Initially, the concentration of products is low, so the rate of the reverse reaction is also low.

Explanation:

A chemical reaction is said to be reversible when the reactants forms the products, which in turn reacts together again to give rise to the reactants. In a reversible reaction, the formation of products from reactants occurs simultaneously with the reformation of the reactants from the products. For example:

The reversible reaction: A + B ⇆ C + D means;

A + B → C + D and C + D → A + B

The rate at which both forward and reverse reactions are taking place in closed system may be initially different but with time, it gets equal to form an equilibrium reaction. However, at first, only the rate of the forward reaction proceeds because the concentration of the product is low. Hence, the rate of reaction of the reverse reaction (product to reactants) is low as well.

In the reversible reaction above, the rate of the reverse reaction (C + D → A + B) will turn out low initially because the concentration of the products (C and D) are low. With time, the rates of the forward and reverse reaction becomes equal to form an EQUILIBRIUM or STABLE reaction.

Answer:

\(311.43\ \text{mL}\)

Explanation:

\(\rho\) = Density of acetic acid = \(1.05\ \text{g/mL}\)

\(m\) = Mass of acetic acid = \(327\ \text{g}\)

\(V\) = Volume

Density is given by

\(\rho=\dfrac{m}{V}\\\Rightarrow V=\dfrac{m}{\rho}\\\Rightarrow V=\dfrac{327}{1.05}\\\Rightarrow V=311.43\ \text{mL}\)

The volume of acetic acid is \(311.43\ \text{mL}\).

Answer:

Dmitri Mendeleev

Explanation:

Dmitri Mendeleev published the first recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table. Most of his forecasts proved to be correct

Answer:

Mendeleev periodic table

Explanation:

In 1869, just five years after John Newlands put forward his

Law of Octaves, a Russian chemist called Dmitri Mendeleev

published a periodic table. Mendeleev also arranged the

elements known at the time in order of relative atomic mass

The statements (ii) and (iii) are the true statement which include about ozone . So, option (d) is correct choice.

The ozone layer is the layer that surrounds the earth and contains a high concentration of O₃ ozone. Ozone O₃ is a gas molecule composed of three oxygen atoms. Ozone is commonly known as photochemical "smoke" and is harmful to respiration.

It is formed by the dissociation of two atoms forming oxygen. It is a harbinger of acid rain. Exposure to ozone can harm human health. Ozone absorbs some wavelengths of ultraviolet radiation and protects the earth's surface from dangerous radiation. Therefore, it is clear from the above discussion that (ii) and (iii) are correct statements about ozone.

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A healthy behavior can be maintained by maintaining healthy relationships with supportive friends and family, keeping good hygiene, having enough sleep, exercising etc.

Maintaining a healthy behavior is very important not just for our emotional and mental health but also for our overall physical as well as social well being too. Our behavior reflects our attitude as well as our beliefs.

A healthy behavior can be maintained by healthy social interaction amongst our peers, supportive friends, family and also in the community as well as institution which we are a part of. One can also maintain healthy behavior by adopting healthy habits like exercising, sleeping on time, keeping good hygiene etc.

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The mass is going to increase because the iron was combined with oxygen.

We know that the mass of the object can be obtained by the use of a weighing balance. Again it is very important that we should bear in mind that what has happened here as the iron is rusting is actually a chemical change.

The ion was bale to combine with oxygen in the presence of moisture, Given the fact that the iron has combined with oxygen, we no longer have a pure iron hence the mass of the iron is definitely going to become increased.

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If a piece of iron is weighed, allowed to go rusty, and weighed again, it has increased in mass, this is because of the formation of rust.

Rusting is the slow oxidation of iron in the presence of oxygen and moisture that results in the creation of hydrated iron oxide. Rust is a brown coating that formed when iron and oxygen in the air combine, when moisture is present. Rust is a reddish-orange flaky material.

The metal surface is where rusting is most prone to happen since it is an oxidation process.

When rust forms, the mass of the iron object is increased by the mass of oxygen that has combined with some of the iron.

If a piece of iron is weighed, allowed to go rusty, and weighed again, it has increased in mass, this is because of the formation of rust.

\(Fe_{2} O_3.nH_2O\) - this will be the new composition and when you find the molar mass of this compound its obviously greater than Fe (Iron).

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Answer: reproduction and growth are characteristics that are used to determine if something is considered living.

Explanation: All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.

The reproduction and growth characteristics are used to determine if something is considered living. Therefore, option B and C are correct.

The production of offspring is referred to as reproduction. There are two types of reproduction: sexual reproduction and asexual reproduction.

An organism that reproduces sexually combines the genetic information from both parents and is genetically unique. Asexual reproduction occurs when one parent copies itself to produce genetically identical offspring.

Order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing are all shared by all living organisms. When taken together, these traits serve to define life.

Thus, option B and C are correct.

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Answer:

Ver explicacion

Explanation:

El litio es un metal y el oxígeno no es un metal.

La electronegatividad del litio es 0,98 mientras que la electronegatividad del oxígeno es 3,44.

La diferencia de electronegatividad entre el oxígeno y el litio es 3,44 - 0,98 = 2,46

Basado en esta amplia diferencia en electronegatividad, el enlace entre el oxígeno y el litio es un enlace iónico.

El porcentaje de carácter iónico del enlace se obtiene de;

Porcentaje de carácter iónico = 100 * (1-exp (-0,25 * (Electronegatividad del elemento A-Electronegatividad del elemento B) ^ 2))

Porcentaje de carácter iónico = 100 * (1-exp (-0,25 * (2,46) ^ 2)

Porcentaje de carácter iónico = 77,97%

Answer:

2

Explanation:

Answer:

a

Explanation:

i just took it

The gas that has particles that move at a greater speed is O₂ with a mass of 32 amu at 15 degrees.

The molar mass of gas and the speed of the particles of the gas are inversely proportional. This means that the higher the molar mass of a gas, the lower will be the speed of the particles of the gas

This is in accordance with Graham's law of diffusion which states that the rate of diffusion of a gas is inversely proportional to the square of the density of the gas.

Also, an increase in the temperature of a gas will result in an increase in the speed of the particles of the gas.

However, for two gases at the same temperature, the molar mass of the gases will determine the speed of the particles of the gas.

The heavier gas will have particles that move at a lower speed.

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Answer:

testable questions are answer through observation or an experiment that provides evidence that the questions connects to the scientific concepts rather the opinion feelings

therefore the question can be tested through observation or experiment

Four possible clues that a chemical change has taken place include the formation of a precipitate, the evolution of a gas, a change in color, and the release or absorption of energy.

1. Formation of a precipitate: When two solutions are mixed and a solid substance forms, it indicates a chemical change. This solid, called a precipitate, is formed by the reaction of ions present in the solutions.

2. Evolution of a gas: If bubbles or gas is produced during a reaction, it suggests a chemical change. The release of gas is often accompanied by fizzing, foaming, or the production of an odor.

3. Change in color: When the color of a substance changes during a reaction, it signifies a chemical change. This change can be due to the formation of new compounds or the rearrangement of existing ones.

4. Release or absorption of energy: Chemical reactions involve the breaking and forming of chemical bonds, which can release or absorb energy. If there is a noticeable change in temperature, light, or sound during a reaction, it indicates a chemical change has occurred.

These four clues serve as evidence that a chemical change has taken place and distinguish it from physical changes, such as changes in state or shape, which do not involve the formation of new substances. Observing these clues allows scientists to identify and study chemical reactions in various fields of science, such as chemistry and biology.

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When SO2 and O2 are combined in a container, the forward reaction's initial rate—the creation of SO3—is higher than the reverse reaction's first rate—the production of SO2.

The concentration of SO2 will reach equilibrium and stop fluctuating.

Now let us consider the following reaction.

2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g)

Which of the following claims regarding this response is accurate?

        TRUE.

       The rate of SO2 production is initially 0 when there is no SO3 present  in the container.

        FALSE.

       The forward reaction rate falls when equilibrium is established, but the reverse reaction rate rises.

        FALSE.

        As a result of the rate of SO2 and SO3 generation being equal at equilibrium, the concentrations do not change.

       TRUE.

       The concentrations of the reactants and products are constant at equilibrium.

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Answer: Extensive!

Explanation:

According to the information provided in the image the emergence of photosynthetic organisms contribute to the weathering of rock was

option B was the correct answer

what does weathering of rock refers to ?

Rock Weathering: Weathering is the transformation of rocks into more stable materials as a result of exposure to agents such as air, water, and organic fluids. No rock is impervious to weathering.

                                                         or

Weathering is the process through which rocks disintegrate and decompose in situ. It signifies that weathering is a static process. Weathering, as defined by C.D. Oilier (1969), is "the breakdown and modification of minerals near the earth's surface to produce products that are more in balance with freshly imposed physico-chemical circumstances."

The rock was formed when oxygen reacted with other elements to form earths crust which weathered the rock.

that is the oxygen that is produced from the photosynthetic process was reacted to the hydrogen that is present in the gases formed the water and that lead to the weathering of the rock.

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Here is the correct order of the transformations of energy in a power plant, from the beginning (top) to the generator (bottom):

Thermal (heat) energy is created by converting nuclear or chemical energy.

Kinetic energy is created from thermal (heat) energy.

Kinetic energy is converted to mechanical energy

Mechanical energy is converted to electrical energy

This is a generalized order and may vary depending on the specific type of power plant.

What is Power Plant?

A power plant is a facility that is designed to generate electricity from various sources of energy, such as fossil fuels (coal, oil, and natural gas), nuclear energy, hydroelectric power, wind power, solar power, and geothermal energy. The main function of a power plant is to convert the energy from its source into electrical energy that can be used to power homes, businesses, and other facilities.

The process of generating electricity in a power plant typically involves several steps, including the production of heat or mechanical energy from the source of energy, the use of turbines to convert this energy into rotational energy, and the use of generators to convert this rotational energy into electrical energy. Power plants may also include various other components, such as cooling systems, transformers, and transmission lines, to ensure the efficient and reliable distribution of electrical power to the end users.

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High ATP concentrations allosterically block the cellular homologs of pyruvate kinase.

Phosphofructokinase activity was hindered by low ATP concentrations through lowering the enzyme's affinity for fructose 6-phosphate, the other substrate. Phosphofructokinase was similarly inhibited by citrate and other tricarboxylic acid cycle intermediates.

The reactions of gluconeogenesis, starting with pyruvate, are as follows: Pyruvate carboxylase uses the mitochondrion to carboxylate pyruvate to create oxaloacetate. Pyruvate carboxylase needs biotin as a cofactor and ATP as such an activating molecule.

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Answer:

Explanation:

Fossil fuels got their name because they are made from dead organisms, mostly plants that didn't decay because they were squashed under water or mud with no oxygen.

Answer:

A substance that cannot be broken down into chemically simpler components is an element.

Aluminum, which is used in soda cans, is an element.

The component(s) of msa make(s) this media selective for sodium chloride.

MSA is a medium  which has both differential as well as selective properties. The distinguishing feature is the high salt content (7.5%). On just this high salt concentration, Staphylococcus species, which frequently inhabit human skin, can develop.

Streptococcus species, however, have their growth inhibited by the high salt content of the agar. Mannitol, a sugar, would be the MSA's unique component.

Resulting in high salt concentration, the sodium chloride in MSA ensures that only Staphylococci species survive. All more gram-positive bacteria are thereafter destroyed.

Therefore, the correct answer will be option (d).

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Answer:

O₂ is limiting reactant and 6.17g CO₂ can be produced

Explanation:

Based on the balanced reaction:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O

1 mole of C₈H₁₈ reacts with 25/2 moles O₂.

To solve this question we must convert the mass of each reactant to moles and, using the balanced reaction, we can find limiting reactant. With moles of limiting reactant we can find the moles of CO₂ and its mass as follows:

Moles C₈H₁₈ -Molar mass: 114.23g/mol-

2.28g * (1mol / 114.23g) = 0.0200 moles C₈H₁₈

Moles O₂ -Molar mass: 32g/mol-

7.00g * (1mol / 32g) = 0.219 moles O₂

For a complete reaction of 0.0200 moles C₈H₁₈ are needed:

0.0200 moles C₈H₁₈ * (25/2moles O₂ / 1mole C₈H₁₈) = 0.250 moles of O₂ are needed.

As there are just 0.219 moles, O₂ is limiting reactant.

Moles of CO₂ that can be produced:

0.219 moles O₂ * (8moles CO₂ / 25/2moles O₂) = 0.140 moles CO₂

The mass is -Molar mass CO₂: 44.01g/mol-:

0.140 moles CO₂ * (44.01g / mol) =

Answer:

pressure = 1.014atms

Explanation:

use ideal gas

PV=nRT

P = (0.250 x 0.08206 x 308)/(6.23)

P = 1.014 atm