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3 years ago

A chemical change occurs when two or more substances join to form new substances with new ______________ properties

Chemistry

2 answers:

ivanzaharov [21]3 years ago

5 0

Answer:

hope this helps!

Explanation:

In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change

lara31 [8.8K]3 years ago

3 0

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

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The H30+ concentration of a solution is equal to 0.8 M. What is the pH of the solution?

timurjin [86]

Answer:

option A= pH = 0.1

Explanation:

Given data:

Concentration of H₃O⁺ = 0.8 M

pH = ?

Solution:

pH = -log [H₃O⁺] H₃O⁺ = H⁺

pH = -log [0.8]

pH = - (-0.097)

pH = + 0.1

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3 years ago

Calculate the energy (in joules) of each photon that is emitted from a patch of ground that is at 32 ∘C. Use the λmax of that te

AlekseyPX

Attached response

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3 years ago

Balanced equation of potassium chloride and ammonium nitrate; it’s types, net and observation

ASHA 777 [7]

Potassium chloride reacts with ammonium nitrate to give ammonium chloride and potassium nitrate.

This is a type of double displacement reaction. The balanced chemical equation can be represented as,

$KCl(aq)+NH_{4}NO_{3}(aq)-->NH_{4}Cl(aq)+KNO_{3}(aq)$

Total ionic equation for this reaction will be,

$K^{+}(aq)+Cl^{-}(aq)+NH_{4}^{+}(aq)+NO_{3}^{-}(aq)--> K^{+}(aq)+NO_{3}^{-}(aq)+NH_{4}^{+}(aq)+Cl^{-}(aq)$

There is no apparent reaction as this reaction is not accompanied by the formation of a gas or a solid precipitate. We cannot observe any visual reaction as there is not net reaction taking place. All the ions remain as spectator ions.

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4 years ago

Anyway, which is a spectator ion involved in the reaction of k2cro4(aq) and ba(no3)2(aq)?

marissa [1.9K]

Nitrate ions $\text{NO}_3^{-}$ and potassium ions $\text{K}^{+}$ .

<h3>Explanation</h3>

Potassium dichromate undergoes a double-decomposition reaction with barium nitrate to produce barium dichromate and potassium nitrate. The reaction is possible due to the low solubility of barium dichromate that precipitate out of the solution readily after its production.

Start with the balanced chemical equation for this process:

$\text{K}_2\text{CrO}_4 \; (aq) + \text{Ba}(\text{NO}_3)_2 \; (aq) \to \text{Ba}(\text{CrO}_4)_2 \; (s) + 2 \; \text{KNO}_3 \; (aq)$

Rewrite the chemical equation as an ionic one; express all soluble salts- those with state symbol (aq)- as their constituting ions while leaving the insoluble (s) intact.

$2 \; \text{K}^{+}\; (aq)+ 2\; \text{CrO}_4^{-} \; (aq) + \text{Ba}^{2+} \; (aq) + 2 \; \text{NO}_3^{-} \; (aq) \\ \to \text{Ba}(\text{CrO}_4)_2 \; (s) + 2 \; \text{K}^{+} \; (aq) + 2 \; \text{NO}_3^{-} \; (aq)$

$\text{K}^{+}$ and $\text{CrO}_4^{-}$ are found on both sides of the equation by the same quantity. The two ions thus took no part in the net reaction and act as spectator ions.

5 0

3 years ago

Select the correct statement about isotopes. A. All the isotopes of an element are radioactive. B. Isotopes of the same element

frutty [35]

Answer: Option (B) is the correct answer.

Explanation:

Isotopes are the substances or species that contain same number of protons but different number of neutrons.

As it is known that atomic number means the total number of protons present in an atom. Hence, this also means that in isotopes atomic number of the species is same.

For example, isotopes of hydrogen are $^{1}_{1}H$ , $^{2}_{1}H$ , and $^{3}_{1}H$ .

Isotopes of only heavier elements are radioactive in nature as they have large difference in the number of protons and neutrons.

Thus, we can conclude that the statement isotopes of the same element have the same atomic number but differ in their atomic masses, is correct.

7 0

3 years ago