which is not possible sign of chemical change
A:color change
B:light given off
C:heat given off
D:a change of state

Answer

A. 122 nm

Explanation

When a Hydrogen atom undergoes a transition from n=2 to n=1 level, a photon with λ=122nm is emitted.

Answer:

See Explanation

Explanation:

Both oxygen and dinitrogen (1) oxide are known to rekindle a glowing splint. However, oxygen is an odorless gas while dinitrogen (1) oxide has a faint smell and has an effect on the central nervous system.

Also, the combustion of dinitrogen (1) oxide produces brown fumes of nitrogen IV oxide.

Finally, when dinitrogen (1) oxide and oxgen are both heated with copper, residual nitrogen gas is left with dinitrogen (1) oxide while no residual gas is left with oxygen.

The mass of the box A is 10 g and the mass of box b is 5 g. The mass ratio between them is:

mass of box a = 10 g

mass of box b = 5 g

mass ratio A/B = mass of box A/mass of box B

mass ratio A/B = 10 g/5 g

mass ratio A/B = 2

Answer:26.9

Explanation:

Explanation: solids are frozen like if you freeze tea it becomes a solid , liquids is like tea and gases is like when you boil water and it becomes a gas

Answer:

No I do not but did you know that you can save 15 or more on car insurance by switching to geico?

Explanation:

Answer:

they each have the same number of protons

Answer:they each have the same number of protons

Explanation:

I just took the test

Answer:

Difference between Vapor and Gas

Usually, a vapour phase consists of a phase with two different substances at room temperature, whereas a gas phase consists of a single substance at a defined thermodynamic range, at room temperature

Explanation:

Answer:

Fluorine is a non-metal, fills its shell by gaining one electron and becomes a negatively charged ion.

Explanation:

Fluorine have seven electrons in its outermost shell. This means that fluorine is located in Group 17(Halogens) in the Periodic Table. Note that halogens are non-metal elements. So fluorine is a non-metal.

Fluorine fills its shell by gaining one electron because it only needs one electron to achieve stable octet electron arrangement. ( it's easier to gain one electron than to lose all seven electrons in the outermost shell)

As fluorine atom gain one electron to achieve stable octet electron arrangement, its number of electrons becomes greater than its number of protons. So it becomes a negatively charged ion.

Explanation:

Arrhenius acid:

According to this theory, an Arrhenius acid is a compound that in an aqueous solution produces or increases hydrogen ions (H+).

Answer: OD. It produces hydrogen ions.

Answer:

Explanation:1. It is known that humans are in fact eating these tiny plastic particles, but fish aren't the only source. Bottled water, beer, honey, sea salt and tea bags have all been exposed as microplastic carriers, just to name a few.

2.The chemicals used in the production of plastic are toxic and detrimental to the human body. Chemicals in plastic-like lead, cadmium and mercury directly can come in contact with the humans. These toxins can cause cancers, congenital disabilities, immune system problems and childhood development issues.

3.Microplastics entering the human body via direct exposures through ingestion or inhalation can lead to an array of health impacts, including inflammation, genotoxicity, oxidative stress, apoptosis, and necrosis, which are linked to an array of negative health outcomes including cancer, cardiovascular diseases,

4.Human penises are shrinking because of pollution, warns scientist. ... Dr Shanna Swan writes that humanity is facing an "existential crisis" in fertility rates as a result of phthalates, a chemical used when manufacturing plastics that impacts the hormone-producing endocrine system

Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

Answer:

\(\%_{X-122}=29.5\%\)

Explanation:

Hello!

In this case, since isotopes are atoms of the same element with equal number of protons and electrons but different atomic mass, we can write the equation used to compute the average atomic mass of the considered X:

\(m_X^{avr}=\%_{X-120}*120+\%_{X-122}*122\)

However since both percentages compose the 100%, we can write one of those in terms of the other:

\(m_X^{avr} = (100\%-\%_{X-122})*120+\%_{X-122}*122\)

Thus, we can solve for the percent abundance of X-122 as shown below:

\(120.59 = 120-\%_{X-122}*120+\%_{X-122}*122\\\\120.59-120=\%_{X-122}(122-1200)\\\\120.59-120=\%_{X-122}*2\\\\\%_{X-122}=\frac{0.59}{2}=29.5\%\\\)

Thus the percent abundance of the other isotope would be 70.5 %.

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Answer:

Explanation:

The subscripts in a formula determine the ratio of the moles of each element in the compound. To convert this formula to the empirical formula, divide each subscript by 2. This is similar to reducing a fraction to its lowest denominator.

The given question is incomplete as it lacks the appropriate options, however, the options related to this question is as follows:

a)Test a composite material in the lab to see how it can be improved.

b)Look into trends of various diseases and their effects on society.

c)Research available drugs for treating illnesses such as cancer and heart disease, as well as the side effects of these drugs.

d)Make a plan for how to conquer a disease with drugs.

Answer:

The correct answer is - b)Look into trends of various diseases and their effects on society.

Explanation:

The young scientist who wants to focus on creating drugs to treat disease must think and look for the diseases that are needed to be treated at the moment or affecting the population most and how it affects the society and then plan how to do it.

So, the scientist needs to check the trends of various disease and their effect on society for developing understanding which disease needs to be cure first and how it affects.

Thus, the most appropriate answer is - option B.

Answer:

b)Look into trends of various diseases and their effects on society.

Explanation:

ap3x

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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The chunks of fluid magma that fall back to the surface to feed a lava flow can give rise to two different types of surfaces: rough and smooth.

A rough lava surface is often associated with a type of lava called 'aa' (pronounced "ah-ah"). Aa lava flows are characterized by a jagged and clumpy texture. This occurs because the chunks of magma, known as clinkers, are fragmented and accumulate on top of the flow. As the flow advances, the clinkers are pushed forward, creating a rough and uneven surface. Aa lava flows tend to be slower-moving and can be hazardous to walk on due to their rough texture.On the other hand, a smooth lava surface is typically associated with a type of lava known as 'pahoehoe' (pronounced "pah-hoy-hoy"). Pahoehoe lava flows are characterized by a smooth, undulating surface with a rope-like or ropy texture. The fluid magma of pahoehoe lava allows it to flow more freely, resulting in a surface that appears molten and smooth. Pahoehoe flows can travel greater distances compared to aa flows and are generally easier to traverse.The type of lava surface, whether rough or smooth, depends on various factors such as the viscosity of the magma, eruption style, and the rate of cooling during the lava flow.

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The proper explanations to the observation are;

A redox reaction is one in which a specie is oxidized while the other specie is reduced. In the first observation, the color of the solution turned blue and in the second observation, shiny hair like crystals deposited on the copper strip.

Hence;

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A hydrocarbon is any of a class of organic chemicals made up of only the elements carbon (C) and hydrogen (H).

A substance composed solely of hydrogen and carbon. Coal, petroleum, natural gas, and tar are examples of hydrocarbons. They are used to generate energy.

A hydrocarbon is an organic chemical compound that is made up entirely of hydrogen and carbon atoms. Hydrocarbons are naturally occurring substances that serve as the foundation for crude oil, natural gas, coal, and other important energy sources.

The carbon atom or atoms are usually in the centre of a hydrocarbon molecule, with the hydrogen atoms covalently bonded around it. Hydrocarbons include CH4 C H 4, methane, C2H4 C 2 H 4, ethene, and C6H6 C 6 H 6, benzene.

CnH2n+2 is the general formula for saturated hydrocarbons (assuming non-cyclic structures) Saturated hydrocarbons are the basis of petroleum fuels and are found as either linear or branched species.The simplest alkanes have their C atoms bonded in a straight chain; these are called normal alkanes.

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Answer:

NaClO + CH₃COOH ----> HClO + CH3CO- + Na

Explanation:

This reaction occurs between the combination of a salt and an acid, that is, an oxide-reduction reaction

Answer:

40/220 ×100=18.6 is all I got I know that by heart so um yea

Explanation:

Answer:

Nuclear fusion is a kind of nuclear reaction in which two lighter nuclei combine under suitable conditions to form heavier nuclei under suitable conditions

Explanation:

Let us define what Nuclear fusion is

Nuclear fusion occur as a result of two or more atoms coming together to form a more complex or a different atom entirely, and after the process, energy is released or absorbed.

From the given options, the correct answer is

The process by which small nuclei combine into a larger nucleus

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Na (sodium) and F (fluorine) can bond because they have different electronegativities. Electronegativity is a measure of an atom's ability to attract electrons to itself. Fluorine is one of the most electronegative elements on the periodic table, while sodium is one of the least electronegative. This creates an electrostatic attraction between the two atoms, allowing them to form a chemical bond. The bond between Na and F is called an ionic bond.

The ionic bond between Na and F is formed when the sodium atom loses one electron to form a Na+ cation, and the fluorine atom gains one electron to form a F- anion. The resulting molecule is NaF.

Be (beryllium) and Br (bromine) can bond because they also have different electronegativities. Be is less electronegative than Br, and this creates an electrostatic attraction between the two atoms, allowing them to form a chemical bond. The bond between Be and Br is called a covalent bond.

The covalent bond between Be and Br is formed when both atoms share electrons. The resulting molecule is BeBr2 (Beryllium dibromide).

In general, it's important to note that the type of bond formed between two atoms depends on their electronegativities, if they are similar they tend to form covalent bond and if they are different they tend to form ionic bonds.

Answer:

The most straightforward definition is that an acid is a molecular compound that contains one or more hydrogen atoms and produces hydrogen ions (H+) when dissolved in water.

From the stoichiometry of the reaction, 0.094 g  of \(Cu^{2+}\) is contained in the reaction.

The reaction equation is given by; \(2Na_{3}PO_{4} (aq) + 3CuCl_{2} (aq) ----- > 6NaCl (aq) + Cu_{3}(PO_{4}) _{2} (s)\). We must note that the balanced reaction equation is the entry way into obtaining the correct stoichiometry of the reaction in order to solve the problem.

Number of moles of \(Na_{3}PO_{4}\) =  5.00 × 10−2 L *  0.173 mol L−1 = 0.00865 moles

If 2 moles of \(Na_{3}PO_{4}\) produces 1 mole of\(Cu_{3}(PO_{4}) _{2}\)

0.00865 moles of \(Na_{3}PO_{4}\) produces  0.00865 moles * 1 mole/2 moles

= 0.0043 moles of \(Cu3(PO4)2\)

Number of moles of \(Cu^{2+}\) = 0.0043 moles/3 = 0.00144 moles

Mass of \(Cu^{2+}\) = 0.00144 moles * 63.5 g/mol = 0.094 g

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