Which statement is true about ionic compounds?They are made up of many large molecules that are bonded together.
They are made up of atoms of only one type of element.
They are made up of particles that are arranged in a repeating pattern.
They are made up of a random ratio of elements that are bonded together.

Answers

Answer 1

Answer: I believe that the best answer among the choices provided by the question isThey are made up of particles that are arranged in a repeating pattern.
Hope my answer would be a great help for you. If you have more questions feel free to ask here at Brainly.

Answer 2

Answer:

Ionic compounds are made up of particles that are arranged in a repeating pattern. Therefore, the correct option is option C.

A specific class of chemical compound known as an ionic compound is created when two or more atoms share electrons. It is made up of anions, which are negatively charged ions, and cations, which are positively charged ions. Most frequently, ionic compounds are created when a metal interacts with a non-metal. The non-metal atom receives one or more electrons to become an anion during this reaction, whereas the metal atom loses one or more electrons to become a cation. The development of a stable ionic compound happens as a result of the electrostatic forces that draw these oppositely charged ions to one another.

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Base your answers to questions 76 through 79 on the information below and on your knowledge of chemistry.During a laboratory activity, a student places 25.0 mL of HCl(aq) of unknown concentration into a flask. The student adds four drops of phenolphthalein to the solution in the flask. The solution is titrated with 0.150 M KOH(aq) until the solution appears faint pink. The volume of KOH (aq) added is 18.5 mL.

76 What number of significant figures is used to express the concentration of the KOH (aq)?

77 Complete the equation in your answer booklet for the neutralization reaction that occurs during the titration.

HCl + KOH--> ________________

78 Determine the concentration of the HCl(aq) solution, using the titration data.

79 Describe one laboratory safety procedure that should be used if a drop of the KOH(aq) is spilled on the arm of the student.

Answers

The precaution taken when KOH is dropped on the arm of a student is to apply plenty water over the affected area.

What is titration?

The term titration has to do with a reaction between an acid and a base to form salt and water only.

In this reaction, we have; KOH + HCl -----> KCl + H2O. The concentration of KOH was expressed to two significant figures.

The concentration of HCl is obtained from;

0.150 M * 18.5 mL * 1/25.0 mL * 1 = 0.11 M

The precaution taken when KOH is dropped on the arm of a student is to apply plenty water over the affected area.

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76. 3 significant figures
77. KCl +H(little)2O
78. 0.1M
79. rinse it off with water or tell the teacher
Hope this helps :)

Which statement best explains the role of acatalyst in a chemical reaction?
(1) A catalyst is added as an additional reactant
and is consumed but not regenerated.
(2) A catalyst limits the amount of reactants used.
(3) A catalyst changes the kinds of products produced.
(4) A catalyst provides an alternate reaction pathway
that requires less activation energy.

Answers

The answer is (4). If you look at a Maxwell-Boltzmann energy curve, you will see that lowering the activation energy will increase the proportion of molecules with sufficient energy for a successful reaction collision. Therefore, a reaction with lower activation energy will proceed more quickly. Often, this lower activation energy is obtained by another mechanistic pathway. Catalysts increase reaction speed through these two basic mechanisms.

14. How do scientists know that the universe is expanding? The galaxies are moving away from each other, and the temperatures are decreasing. The galaxies are moving away from each other, and the temperatures are increasing. The galaxies are moving toward each other, and the temperatures are increasing. The galaxies are moving toward each other, and the temperatures are decreasing.

Answers

The universe is expanding is as the galaxies are moving away from each other, and the temperature of the universe is decreasing. Therefore, option (1) is correct.

How is the universe expanding?

First scientists theorized that as the universe is expanding and its temperature has gradually decreased. The universe has been expanding since the Big Bang and, as it expands, it’s temperature cooling down.

The temperature of the universe can be measured by looking at the cosmicmicrowave background (CMB). The temperature an be estimated by the thermal radiation left over from the BigBang.

The CMB scientists have been investigating that its temperature has been dropping off gradually as our universe expands out and the current average temperature of the cosmos is estimated about 2.73 Kelvin.

The point of the Big Bang from the Big bang theory is described as densesingularity and infinitely hot. The energy from the Big Bang distributed as the universe expands and gives the cooling effect.

But new research suggests otherwise that the temperature of the earth is actually increasing as it expands. Therefore, the temperature of universe increasing with its expansion.

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the galaxies are moving away from each other and the temps are decreasing

The process in which a substance changes from a gaseous state to the liquid state is

Answers

The process in which a substance changes from a gaseous state to a liquid state is condensation

hope this helps!!!

Answer:

Condensation is the change of state from a gas to a liquid

Which of the following is true for compounds?They can be separated into their component elements through physical means.
They can be created by chemical reactions.
They can consist of no more than two types of elements.
They all have the same properties regardless of their elemental composition.

Answers

They can be created by chemical reactions.

Compounds have varying properties, depending on the compounds they are made from, and are created by chemical reactions.

Answer: The correct option is that the compounds are created by chemical reactions.

Explanation:

Option 1: Elements combine chemically in a specific ratio to form compounds. They can't be separated by physical methods like filtration. For example, $H_2O$ is made up 2 H-atoms and 1 O-atom. When we filter water through normal filtration, we do not obtain H-atom and O-atom separately, but we get combined form of hydrogen and oxygen atom that is $H_2O$ .

Option 2: Compounds are formed when two or more elements combine chemically.

$2H_2(g)+O_2(g)\rightarrow 2H_2O(l)$

Option 3: Compounds can have more than two types of elements. For example, In $CaCO_3$ , 3 elements are present - Calcium(Ca), Carbon(C), Oxygen(O).

Option 4: Compounds formed have different properties from one another. There can be difference in physical properties as well as chemical properties. For example, $H_2O$ (water) and $CaCO_3$ (calcium carbonate) are two compounds. Water is present in liquid state and calcium carbonate is present in solid state. Hence, it showed that all the compounds cannot have same properties.

The molarity of a solution of 5.0 g of KCl in 100. mL of solution is ________. A) 0.038 M B) 0.067 M C) 0.67 M D) 0.13 M E) 1.3 M