Help ASAP please! I don’t understand this at all.

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Answer 1

Answer:

well i think what you do first is that you would divide that number of amu by 6.02 x 10^23 and that will get you the number of moles of H2. once you have the number of moles you divide the number of moles by the molar mass of H2 and that should give you the grams. i’m trying to explain this as best as possible sorry if ur still confused.

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Four gases are described below:Gas A: 5 liters at 20 °CGas B: 5 liters at 10 °CGas C: 5 liters at 40 °CGas D: 5 liters at 30 °CWhich gas has the greatest average molecular kinetic energy?

PLSSS HELLLPPP MEEEE PLSSSS

Answers

BB = donut body
Bb= donut body
bb= bacon body

(The punnett square is wrong because both parents are hybrid)

The answer is the third one

write equations to show the chemical processes which occur when the first ionization and the second ionization energies of lithium are measured?

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Answer:

First ionization of lithium:

$\text{Li}\;(g)\to \text{Li}^(+) \; (g) + \text{e}^(-)$ .

Second ionization of lithium:

$\text{Li}^(+)\;(g) \to\text{Li}^(2+) \;(g) + \text{e}^(-)$ .

Explanation:

The ionization energy of an element is the energy required to remove the outermost electron from an atom or ion of the element in gaseous state. (Refer to your textbook for a more precise definition.) Some features of the equation:

Start with a gaseous atom (for the first ionization energy only) or a gaseous ion. Write the gaseous state symbol $(g)$ next to any atom or ion in the equation.
The product shall contain one gaseous ion and one electron. The charge on the ion shall be the same as the order of the ionization energy. For the second ionization energy, the ion shall carry a charge of +2.
Charge shall balance on the two sides of the equation.

First Ionization Energy of Li:

The products shall contain a gaseous ion with charge +1 $\text{Li}^(+)\;(g)$ as well as an electron $\text{e}^(-)$ .
Charge shall balance on the two sides. There's no net charge on the product side. Neither shall there be a charge on the reactant side. The only reactant shall be a lithium atom which is both gaseous and neutral: $\text{Li}\;(g)$ .

Hence the equation: $\text{Li}\;(g) \to \text{Li}^(+)\;(g) + \text{e}^(-)$ .

Second Ionization Energy of Li:

The product shall contain a gaseous ion with charge +2: $\text{Li}^(2+)\;(g)$ as well as an electron $\text{e}^(-)$ .
Charge shall balance on the two sides. What's the net charge on the product side? That shall also be the charge on the reactant side. What will be the reactant?

The equation for this process is $\text{Li}^(+) \; (g) \to \text{Li}^(2+)\;(g) + \text{e}^(-)$ .

Final answer:

The first ionization energy of lithium is represented by the equation: Li(g) -> Li+(g) + e-, with an energy of +54.4 eV. The second ionization energy is represented by the equation: Li+(g) -> Li2+(g) + e-, with an energy of 30.6 eV. These equations demonstrate the process of ionization.

Explanation:

The ionization energy of an element is the energy required to remove an electron from a gaseous atom or ion. The first ionization energy of lithium is represented by the equation: Li(g) -> Li+(g) + e-, the energy required for this process is +54.4 eV.

The second ionization energy refers to the energy required to remove the second electron. For lithium, the second ionization energy is represented by the equation: Li+(g) -> Li2+(g) + e-, the energy needed for ionizing the second electron is 30.6 eV.

The equations represent the processes which occur when the first ionization and the second ionization energies of lithium are measured.

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What would be an example of a chemical change that took a long time to occur?

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The rusting of iron is an instance of a chemical change that takes a long time to occur.

What is rusting?

Rust is an iron oxide, which is a typically reddish-brown oxide formed by the catalytic reaction of iron and oxygen in the presence of water or air moisture.

Rust is made up of hydrous iron(III) oxides and iron(III) oxide-hydroxide and is commonly associated with refined ironcorrosion.

Rusting is defined as the chemical process by which a red or orange coat forms on the surface of metals. Corrosion includes rusting.

When iron or its alloys are exposed to moist air, rust forms. The hydrated oxide is formed when oxygen and water in the air react with the metal.

(Fe2O3) is the well-known red form of rust, but iron has other oxidation states and can form other colors of rust.

Thus, this is the example of a chemical change that took a long time to occur.

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rusting takes a long time, and rusting is a chemical change.

What observations can you make about the valence electrons in the following columns of the periodic table? -Column 1:
-Column 2:
-Transition Metal Columns:
-Columns 3–7:
-Column 8:

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Answer:

Column 1. They have one valence electron

Column 2. They have 2 valence electrons

Transition metal column. Variable oxidation states

Column 3–7. Valence electron ranges from 3 to 7 electrons

Column 8. Completely filled i.e no valence electron

Explanation:

Final answer:

Each column of the periodic table represents elements with a specific number of valence electrons. Columns 1 and 2 have one and two valence electrons respectively, and are known for their reactivity. Transition metals typically have one or two, Columns 3-7 have 3 to 7, and Noble Gases in Column 8 have a full shell of eight, making them unreactive.

Explanation:

We can categorize columns, or groups, of the periodic table by the number of valence electrons, which are the outermost electrons in an atom that participate in chemical bonding.

Column 1: These elements, also known as alkali metals, have a single valence electron in their outermost shell. These elements are highly reactive due to their tendency to lose this electron and achieve a stable configuration.
Column 2: These are the alkaline earth metals, which have two valence electrons. They are less reactive than alkali metals but will still readily lose their valence electrons to achieve stability.
Transition Metal Columns: These contain transition metals which typically have one or two valence electrons, although this can be more complex due to the filling of inner d orbitals.
Columns 3–7: Elements in these groups have 3 to 7 valence electrons respectively. Many form covalent bonds by sharing their valence electrons with other atoms.
Column 8: Known as the Noble Gases, these elements possess a stable full set of 8 valence electrons (except for Helium which has 2). They are very unreactive due to their stable electronic configuration.

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Why are some examples of a chemical reaction not actually foolproof evidence that of a chemical reaction?13, 8th grade, and I'm doing my science lab report: The lab was a chemistry lab. We got a bunch of toxic chemicals and put pairs of them together, recorded the reactions, and wrote balanced equations for each of them and identified what kind of reaction they were. The whole name of the lab is "Evidence of Chemical Reactions", and one of the first analysis questions is "write a paragraph about the kinds of changes you would expect to see if a chemical reaction occurs." I answered this with things like bubble formation, change of color, change of state of matter, etc. Then the next question said "any one of these signs is not always a fool proof indication that a chemical reaction is occurring. give two examples to support this statement."
what are two examples to support the statement that the commonly known examples of chemical reactions occurring are not always foolproof evidence that chemical reactions are occurring?

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So basically, the change in color effects the amount of cations in the solution making it a physical change rather than a chemical one, defying the law of conservation of mass! I hope this helped! (The only time the change in color affects the amount of cations is in the Alkaline Earth Metals)

source: college science teacher

Bubble formation, change of color, and change of state are not foolproof evidence of a chemical reaction due to physical changes and variations in the reactions.

While bubble formation, change of color, and change of state of matter are commonly associated with chemical reactions, they are not always foolproof evidence. Two examples to support this statement are:

Physical changes can mimic some of these signs. For example, the melting of ice is a change of state, but it is a physical change rather than a chemical reaction.
Some chemical reactions may not produce the expected signs. For instance, some reactions may be slow or occur at very low concentrations, making it difficult to observe noticeable changes.

Therefore, it is important to consider multiple lines of evidence and conduct further analysis to confirm the occurrence of a chemical reaction.

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If a substance has a large mass and a small volume what can you conclude about it

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I could conclude, based on that information, that the density of the substance is quite high.

You can conclude that the substance has a very high density!

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