Which must be a mixture of substances?
1. solid
2. liquid
3. gas
4. solution

Answers

Answer 1

Answer: the one that must be a mixture of substance is : 4. Solutionhere are some examples that proof option 1 - 3 could consist only with a single substance :Solid = Fe ( most commonly known as iron)Gas = He ( Most commonly known as helium)Liquid = Hg (most commonly known as mercury)

Answer 2

Answer:

4.Solution

Further explanation

Mixtures are materials composed of two or more kinds of substances that still possess their original properties. Mixtures can also be said to represent a combination of several substances, elements or compounds

There are two types of mixtures, i.e., homogeneous mixture (or solution) and heterogeneous mixture.

Homogeneous mixture: mixture which each part contains a similar amount of solute, for example, vinegar acid solution, sugar solution, and salt solution.
Heterogeneous mixes: mixtures of which each part contains an unequal amount of solute, for example, river water, sewage water, and coffee drinks.

The solution is a homogeneous mixture of two or more substances that dissolve one another and each of the constituent substances cannot be distinguished physically anymore.

The solution consists of two components, i.e., solute and solvent.
For example, a salt solution consists of salt as a solute and water as a solvent.

In chemistry, we already know the phase of matter or state of matter, i.e., solid (s), liquid (l), gas (g), and aqueous (aq). Every chemical solution in a reaction is labeled as an aqueous phase, e.g, $\boxed{ \ NaCl_((aq)) \ }$ as a salt solution.

Consider the following examples:

$\boxed{ \ Fe_((s)) \ }$ as a solid metal iron, an element.
$\boxed{ \ H_2O_((l)) \ }$ as liquid water.
$\boxed{ \ H_2O_((s)) \ }$ as ice solids.
$\boxed{ \ H_2O_((g)) \ }$ as water vapor with a gaseous phase.
$\boxed{ \ H_2O_((l)), H_2O_((s)), H_2O_((g)) \ }$ are compounds of the same chemical formula but different phases.

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Keywords: which must be, a mixture of substances, solid, liquid, gas, solution, homogeneous, heterogeneous, phase of matter, state, aqueous, salt, water

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A polyatomic ion that contains two hydrogen atom is called

Answers

Hi there, A polyatomic ion that contains two hyrdrogen atom is called a 'dihydrogen.' The chemical name for dihydrogen is dihydrogen monoxide which is DHMO.

Which ion was formed by providing the second ionization energy to remove an electron? Ca2+ N3– Fe3+ S2–

Answers

Answer:

Ca²⁺

Explanation:

Ionization energy is defined as the minimum amount of energy required to knock out the electron from valence shell of an atom in its gaseous state. While, second Ionization energy is defined as the amount of energy required to knock out the second electron from an ion containing +1 charge in gaseous state.

Among given options Ca²⁺ is the correct choice because the calcium has lost two electrons i.e. first electron was removed by providing first ionization energy i.e.

Ca + 1st IE → Ca¹⁺ + 1 e⁻

and second electron is was removed by providing second ionization energy i.e.

Ca ¹⁺ + 2nd IE → Ca²⁺ + 1 e⁻

$\boxed{{\text{C}}{{\text{a}}^{{\text{2 + }}}}}$ is formed by providing the second ionization energy to remove an electron.

Further Explanation:

The energy that is needed to remove the most loosely bound valenceelectrons from the isolated neutral gaseous atom is known as the ionization energy. It is denoted by IE. The value of IE is related to the ease of removing the outermost valence electrons. If these electrons are removed so easily, small ionization energy is required and vice-versa. It is inversely proportional to the size of the atom.

Ionization energy is further represented as first ionization, second ionization and so on. When the first electron is removed from a neutral, isolated gaseous atom, the energy needed for the purpose is known as the first ionization energy, written as ${\text{I}}{{\text{E}}_{\text{1}}}$ . Similarly, when the second electron is removed from the positively charged species (cation), the ionization energy is called the second ionization energy $\left( {{\text{I}}{{\text{E}}_{\text{2}}}} \right)$ and so on.

The neutral atom corresponding to ${\text{C}}{{\text{a}}^(2 + )}$ is calcium. If second ionization energy is supplied to calcium atom, it results in the removal of two electrons and thus ${\text{C}}{{\text{a}}^(2 + )}$ is formed. So ${\text{C}}{{\text{a}}^(2 + )}$ can be formed by providing second ionization energy. to the neutral atom.

The neutral atom corresponding to ${{\text{N}}^(3 - )}$ is nitrogen. If second ionization energy is supplied to nitrogen, it results in the formation of ${{\text{N}}^(2 + )}$ , not ${{\text{N}}^(3 - )}$ . So ${{\text{N}}^(3 - )}$ cannot be formed by providing the second ionization energy to the neutral atom.

The neutral atom corresponding to ${\text{F}}{{\text{e}}^(3 + )}$ is iron. If second ionization energy is supplied to the iron atom, it results in the formation of ${\text{F}}{{\text{e}}^(2 + )}$ , not ${\text{F}}{{\text{e}}^(3 + )}$ . So ${\text{F}}{{\text{e}}^(3 + )}$ cannot be formed by providing the second ionization energy to the neutral atom.

The neutral atom corresponding to ${{\text{S}}^(2 - )}$ is sulfur. If second ionization energy is supplied to the sulfur atom, it results in the formation of ${{\text{S}}^(2 + )}$ , not ${{\text{S}}^(2 - )}$ . So ${{\text{S}}^(2 - )}$ cannot be formed by providing the second ionization energy to the neutral atom.

Therefore, the only ion that can be formed by supplying the second ionization energy is ${\text{C}}{{\text{a}}^(2 + )}$ .

Learn more:

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Periodic classification of elements

Keywords: second ionization energy, Ca2+, N3-, Fe3+, S2-, IE1, IE2, first electron, second electron, neutral atom., nitrogen, calcium, iron, sulfur.

Which of the following would most likely result in an increase in reaction rate? placing the reactants on a hotplate placing the reactants in an ice bath
placing the products in an ice bath

Answers

Answer:

placing the reactants on a hot plate

Explanation:

If the temperature goes up, the reaction rate will increase. Because the particle will move faster and makes the kinetic energy larger.

Air pollution from automobiles and industrial power plants can be a source of chemical weathering due to the formation ofA. soil.
B. acid rain.
C. iron oxides.
D. calcium carbonate.

Answers

Also acid rain is created from the pollution of automobiles

Air pollution from automobiles and industrial power plants can be a source of chemical weathering due to the formation of C. iron oxides.

What subatomic particle(s) is/are located in the nucleus of the atom? Protons only

Electrons only

Protons and neutrons

Protons and electrons

Answers

Protons and neutrons!

During the 1960s and 1970s, Cesar Chavezworked to unionize migrant farm workers by
(1) seizing the land of the lettuce and grape
growers
(2) securing passage of federal legislation to limit
immigration
(3) using nonviolent tactics such as boycotts and
hunger strikes
(4) urging growers to reduce the workforce
through mechanization

Answers

Answer:

The correct answer is option (3) "using nonviolent tactics such as boycotts and hunger strikes".

Explanation:

Cesar Chavez was a leader of American labor and civil right activists that fought to unionized migrant farm workers by the creation of The National Farm Workers Association. Cesar Chaves used nonviolent tactics to support the migrant farm workers. For instance, when Filipino American farm workers protested for higher wages in 1965, he encouraged Americans to boycott table grapes to support them; while he once performed a 24-day hunger strike in 1972 in the Santa Rita Center as a response to Arizona prohibiting boycotts and strikes by farm workers.

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