The glow emitted by a substance exposed to eternal radiation is called

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Answer 1

Answer: The glow emitted by a substance exposed to external radiation is called 'fluorescence'. In fluorescence, a fluorophore is exposed to external radiation, absorbs the energy and emits a form of light or glow. The answer to this question is 'fluorescence'. I hope this helps.

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A voltaic cell spontaneously converts chemical energy to(1) electrical energy (3) mechanical energy
(2) geothermal energy (4) nuclear energy

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1 - Electrical energy
A voltaic cell is an electrochemical cell that generates electricity through redox reactions.

(1) electrical energy is your answer.

The element carbon is found on the right side of the periodic table and is known as a _________, which means that it is normally a poor conductor of heat and electricity and is dull and brittle.

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Answer:

Non metal.

Explanation:

The periodic table is arrangements of the elements into a particular order based on their atomic number .

In general when we move from left to right in a periodic table the metallic properties of the elements decreases. So we can say that the left most elements are metals and the right most elements are non metals.

Now as carbon is placed on the right side of the periodic table as it is considered to be non metal.

NON-METAL.....................

The grouping element, ul, contains the definition associated with a term from a description list. True False

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Answer:

False is your answer

Final answer:

The statement is false. The <ul> element is for unordered lists, while the <dl> elements along with <dt> and <dd> are used for description lists in HTML.

Explanation:

The statement that the grouping element, <ul>, contains the definition associated with a term from a description list is false. In HTML, the <ul> element is used to create an unordered list, typically represented by bullet points. The definitions associated with terms in a description or definition list are contained within a <dl> element. Within this <dl> element, each term is denoted by a <dt> (description term) element, and the corresponding definition is provided within a <dd> (description details) element. It's important to use these specific elements to ensure proper semantics and accessibility on the web.

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All the elements of a family in the periodic table have what feature in common? A) They all have similar chemical properties. B) They all have the same number of protons in the nucleus. C) They are all located in the same horizontal row or period. Eliminate D) They all have the same number of electrons in the electron cloud.

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The correct answer is A) They all have similar chemical properties.

Explanation:

In chemistry, the periodic table organizes visually the chemical elements. In this, elements are arranged according to different features. In the case of families of the elements, these refer to elements organized in the same column, for example, elements that are in column 18 form a family called noble gases.

These elements form a family because they have chemical properties; in the case of noble gases, this includes similar reactivity and physical features such as color and odor. Besides this, the elements of one family share a similar electron configuration but not the same number of electrons. This means, from the options given the one that identifies the elements that belong to a family is "They all have similar chemical properties".

Each set of elements has an equal number of electrons in the outer orbital. We refer to these as valence electrons. Each element's chemical characteristics are determined by its valence electrons. The correct option is A.

The elements in the same group or column of the periodic table are those whose chemical characteristics are the most comparable. The vertical groups of elements that have the same number of valence electrons and, consequently, comparable chemical characteristics are formed when the elements are arranged in order of atomic number.

Only when matter changes to become a completely other sort of matter can chemical characteristics be measured or observed. They consist of flammability, reactivity, and rusting potential.

Thus the correct option is A.

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Which of these statement is conclusive evidence that mixing sugar in water is a physical change? A). there is no change in color B).there is no precipitate formed. C).there is no gas given off. D).there is no molecular change.

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The statement is conclusive evidence that mixing sugar in water is a physical change is there is no molecular change. Therefore, option D is correct.

What is physical change ?

A change known as physical change occurs when the physical characteristics of matter change. Physical changes include those in color, odor, solubility, and the condition of matter, among others.

Melting, turning into a gas, changing strength or durability, changing crystal structure or texture, and changing shape, size, color, volume, or density are a few examples of physical qualities.

Because sugar molecules are spread throughout the water, but the individual sugar molecules remain unaltered, dissolving sugar in water represents a physical change.

Thus, option D is correct.

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D.) There is no molecular change

"A sphere of radius 0.50 m, temperature 27oC, and emissivity 0.85 is located in an environment of temperature 77oC. What is the net flow of energy transferred to the environment in 1 second?"