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Answer:

The number of protons is 30. Substitute the known values, where N represents the number of neutrons. Let's rewrite the equation as 30+N=65 30 + N = 65 .

Answer:

35 neutrons

Step by step explanation:

Atomic mass of Zinc: 65 amu (atomic mass units)

Number of protons in Zinc: 30

Number of neutrons in Zinc: Atomic mass of Zinc - Number of protons in Zinc = 65-30 = 35 neutrons.

Therefore, zinc atoms have 35 neutrons.

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Weak bases are alkaline solution that does not get completely dissociated. The dissociation constant will be the ratio of the concentration of the products to the reactants.

The weak base ionization constant is the equilibrium constant that is given as the division of the products of the ionization to the concentration of the reactants.

The reaction for HCO₃ is given as:

HCO₃⁻ + OH⁻ ⇄ CO₃²⁻ + H₂O

The value of Ka for the given reaction will be:

Ka = [CO₃²⁻][H₂O] ÷ [HCO₃⁻ ][OH⁻]

Therefore, the Ka of the weak carbonic acid is given as the ratio of the concentration of the products to the reactants.

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Answer:

The top number is the total mass number, particles in an atom of an element that have mass are protons and neutrons.

Explanation:

Answer: As one atomic dipole nears another atom it will affect the electron density distribution, so for example if the slightly positive end of the atom is located next to another atom, it will attract the electron(s) in the other atom. A covalent bond happens when atoms share an electron between them. The other kind of bond is called ionic, and it happens when one atom gives an electron to another atom. These bonds are held together with electric forces. Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different.

Answer:

there are relatively few atoms but they can make many molecules

Explanation:

1:Red cabbage contains a water-soluble pigment called anthocyanin that changes color when it is mixed with an acid or a base.

2: Basic

Answer:

c

Explanation:

c is correct i believe

Answer:

About 21.7 grams.

Explanation:

To find the mass of a sample of sodium chlorate (NaClO₃) given the amount of particles present, we can convert from particles to moles, and moles to mass using its molecular weight.

The molecular weight of sodium chlorate is:

[tex]\displaystyle \begin{aligned} \mathcal{M}_\text{NaClO$_3$} &= (22.99 + 35.45 + 3(16.00)) \text{ g/mol} \\ \\ & = 106.44\text{ g/mol} \end{aligned}[/tex]

And recall that in one mole of any substance, there are 6.02 × 10²³ of it. Hence:

[tex]\displaystyle \begin{aligned} 1.23\times 10^{23} \text{ NaClO$_3$} &\cdot \frac{1\text{ mol NaClO$_3$}}{6.02\times 10^{23}\text{ NaClO$_3$}} \cdot \frac{106.44\text{ g NaClO$_3$}}{1\text{ mol NaClO$_3$}} \\ \\ &= 21.7 \text{ g NaClO$_3$} \end{aligned}[/tex]

In conclusion, there are about 21.7 grams of sodium chlorate.

Answer:

The moderators are just there to delete relevant questions or answers but they aren't deleting the spammers .

Explanation:

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Increase in temperature increases air's ability to hold water vapour. That is option B.

Water vapor is defined as the form of water when in gaseous state.

Water turns to vapour when heat is added to it leading to evaporation.

Therefore, Increase in temperature increases air's ability to hold water vapour.

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Answer:

Explanation:

Answer:

Gases have no definite shape or volume. They are fluid, allowing particles/molecules to move freely.

The behavior of a gas is that the volume changes directly with temperature. With a constant volume, the pressure will be directly proportional to the amount of gas.

Explanation:

These are some of the properties I can think of

Answer:

1,3 - dimenthylbenzene

Right option is (c).

Explanation:

⠀

⠀

As here in the figure, we can see the hexagonal shape with a circle inside it which depicts the benzene ring. And at 1 and 3 carbon atom, the methyl group is attach to the it.

⠀

It's formula will be

[tex] \sf C_8H_{10}[/tex]

It is also known as m-xylene.

⠀

And this organic compound is used in leather and rubber industries.

Answer:

It's B

Explanation:

as I answered it in study island.

Answer:

Sand would most likely be a homogeneous mixture

An element is a pure substance that cannot be separated into simpler substances by chemical or physical means

Answer:

It is an element.

Explanation:

chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.

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Answer:

114 grams N₂

Explanation:

To find the answer, you need to (1) convert from moles CuO to moles N₂ (via the mole-to-mole ratio from equation) and then (2) convert from moles to grams (via molar mass from the periodic table). The final answer should have 3 sig figs according to the given value (12.2).

2 NH₃ + 3 CuO --> 3 Cu + 1 N₂ + 3 H₂O

Molar Mass (N₂): 2(14.01 g/mol)

Molar Mass (N₂): 28.02 g/mol

12.2 moles CuO           1 mole N₂              28.02 grams
-----------------------  x  -----------------------  x  -----------------------  = 114 grams N₂
                                  3 moles CuO              1 mole N₂

The equation will balance because the number of hydrogen atoms and atoms is in the reactants and in the products in this case is 2.

Reaction balancing is a method used in several areas of Chemistry to determine the amount of matter of each of the substances participating in the reaction, as well as to establish the existing proportions between the components.

So, since you must have the same amount of sodium and chlorine on each side of the reaction, then you have multiplay the NaCl for 2.

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Answer:

air     water

Explanation:

Mediums that can have waves

IUPAC is the nomenclature approach used for naming compounds. The compounds are ethane, butane, and butene.

IUPAC is the nomenclature method of the organic compounds that are universal and is recommended by the International union so that the names of the same chemical species are constant and ubiquitous all over.

The first compound has a single bond and two carbons hence ethane, the second compound has a single bond and four carbons and hence butane, and the third compound has one double bond and four carbon atoms and hence butene.

Therefore, the compounds are ethane, butane, and butene.

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Answer: …

Explanation:

The concentration of the new solution is 0.003 M.

Required concentration of the final solution will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

M₁ & V₁ are the molarity and volume of initial solution.

M₂ & V₂ are the molarity and volume of final solution.

On putting values from the question, we get

M₂ = (0.75)(2) / (500) = 0.003 M

Hence required concentration is 0.003M.

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Terbium-147 undergoes positron emission to become a stable atom, the stable atom is ₆₄Gd¹⁴⁷.

Series (or family) of natural radioactive decay is the set of elements with unstable nuclei, which follow an orderly sequence of spontaneous decay, that is, they emit alpha and beta particles, until a stable lead nucleus is created.

In this case, natural radioactive decay occurs when the nucleus of the atom of some chemical element is unstable and then it "breaks", releasing electromagnetic radiation and disintegrating.

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Answer: B

Explanation: I know

This question involves the concepts of time period and tangential speed.

The tangential speed of the object is "5.1 x 10⁴ m/s".

The following formula gives the time period of the object:

[tex]T=\frac{2\pi}{\omega}\\\\[/tex]

[tex]\omega = \frac{2\pi}{T}[/tex]

where,

Therefore,

[tex]\omega=\frac{2\pi}{2.2\ x\ 10^4\ s}\\\\\omega=2.86\ x\ 10^{-4}\ rad/s[/tex]

Now, the tangential speed can be given by the following formula:

[tex]v=r\omega[/tex]

where,

Therefore,

[tex]v=(1.8\ x\ 10^8\ m)(2.86\ x\ 10^{-4}\ rad/s)[/tex]

v = 5.1 x 10⁴ m/s

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Answer: 5.1 x 10⁴ m/s

Explanation:

edge 2023

Answer:

Therefore, the oxidation state of sulphur atoms in Na2S2O3 is −2 and +6.

Answer:

True

Explanation:

The number of electrons are what determine an atom.

The number of electrons = number of protons

so the elements are different.

If the number of neutrons are different but the number of electrons and protons are same they are of the same element.

But here the number of protons are different so this is another element.

Answer:

Metallic bonding is the type of chemical bonding that occurs between atoms of metals. In a metallic bond, atoms share their electrons in a way that allows them to form a “sea” of free electrons. This electron sea is responsible for the unique physical and electrical properties of metals.

Explanation:

Answer:

B. allow for bonding metals to be stable.

Explanation:

edge 2022

The statement about the number of moles of acid and base being the same is true in the neutralisation reaction between the acid HCl and base NaOH.

A neutralisation reaction is the type of chemical reaction whereby an acid reacts with a base to form salt and water.

HCl + NaOH --------> NaCl + H2O

In the neutralisation reaction, between the acid HCl and base NaOH above, the balanced chemical equation showed that the initial number of moles of acid is equal to the final amount of the number of moles of known base which is NaOH.

Therefore, the statement about the number of moles of acid and base being the same is possible in the neutralisation reaction between the acid HCl and base NaOH.

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