How many electrons would be found in an isotope of silicon 29
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Answer: 14
Explanation: Founders Educere answer.
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The physical properties of a solution are not affected by the concentration of the components. True False
If you have a crush and they are available but you don't know weather to ask them or just leave it alone which one to do
If 25% of a radioactive element remains after 1,000 years, what is the half-life?
1 According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another?A The volume and the shape stay the same.B The volume increases to fill the new container, but the shape stays the same.C The volume stays the same, but the shape changes to fit the new container.D The volume and the shape change to fill the new container.2 Which of these correctly defines the pH of a solution?A the negative log of the hydronium ion concentrationB the log of the hydronium ion concentrationC the negative log of the hydroxide ion concentrationD the log of the hydroxide ion concentration
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basically studying chemicals
Final answer:
Chemistry is the study of the properties, composition, and structure of substances, and the transformations they undergo. It also deals with the energy exchanges in these processes. As "The Central Science", chemistry interrelates with numerous other scientific disciplines.
Explanation:
Chemistry, often referred to as "The Central Science", is a branch of science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes. It plays a vital role in multiple disciplines such as biology, medicine and environmental science. It allows us to understand the makeup of substances, from the atomic level to complex molecules, and how they interact through chemical reactions.
One example of a branch of Chemistry is thermochemistry, which focuses on relationships between heat, work, and other types of energy in physical and chemical processes. Dalton's atomic theory, investigating quantitative and qualitative aspects of chemistry, also developed the concept of atomic mass units, allowing for the calculation of formula mass and the quantitative description of substances.
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Answer:
Different ions of different elements (usually metals) make a flame burn with a characteristic color when introduced into the reaction zone; the different colors are caused by the different quantized energy levels of the electrons in the different atoms.
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Answer: c. It decreases the phosphate ion concentration, forcing the equilibrium to the left.
Explanation:
The calcium phosphate in water is dissociated according to the following equilibrium:
Ca₃(PO₄)₂ ⇄ 3Ca²⁺ + 2PO₄³⁻
A neutralization reactionis one in which an acid reacts with a base. In the reaction a salt is formed and in most cases water is formed.
Phosphate is the complementary base of phosphoric acid, so when adding acid to the solution, we will neutralize the phosphate present according to the following reaction:
PO₄³⁻ + 3H⁺ ⇄ H₃PO₄
Therefore, when adding acid we increase the solubility of calcium phosphate since we are neutralizing the phosphate present in the salt, decreasing the concentration of phosphate, displacing the first equilibrium shown to the left and favoring the dissolution of calcium phosphate.
Final answer:
The addition of acid to calcium phosphate decreases the phosphate ion concentration, causing a shift in equilibrium to the right, resulting in increased solubility of calcium phosphate.
Explanation:
The addition of acid increases the solubility of calcium phosphate because it decreases the phosphate ion concentration. This process forces the equilibrium to shift to the right, as per Le Chatelier's principle. This principle states that when a stress (in this case, acid addition leading to decreased phosphate ion concentration) is applied to a system at equilibrium, the system responds by shifting in a direction that minimizes that stress. In this case, the equilibrium shifts to the right, resulting in the dissolution of more calcium phosphate to replace the phosphate ions that were removed due to the addition of acid.
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Answer: 8.25 moles of oxygen are produced.
Explanation: The reaction follows:
By Stoichiometry,
As, 4 moles of Aluminium is produced by 2 moles of aluminium oxide
11 moles of aluminium will be produced by =
Now, 2 moles of aluminium oxide produces 3 moles of oxygen, so
5.5 moles of Aluminium oxide will produce =
Hence, 8.25 moles of oxygen will be produced.
4 moles Al ----------> 3 moles O₂
11.0 moles Al -------> ?
O₂ = 11.0 * 3 / 4
= 8.25 moles of O₂
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(1) have combined chemically and retain their different boiling points
(2) have combined chemically and have the same boiling point
(3) have combined physically and retain their different boiling points
(4) have combined physically and have the same boiling point
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Both 2-propanol and water can be separated by the process of distillation because the 2-propanol and water have combined physically and retain their different boiling points. Thus, the correct option for this question is C.
What is Distillation?
Distillation may be defined as a methodology through which components are separated from a mixture. It involves the process by which the components are evaporated and the vapors condensed.
2-propanol is also known as Isopropyl alcohol. The boiling point of this is 82.5°C which is lower than that of water. When both 2-propanol and water are mixed they usually get separated through the physical process known as boiling. Water typically starts boiling at 100°C.
Therefore, the correct option for this question is C.
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