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pantera1 [17]
3 years ago
11

USATestPrep Question: This is a substance that cannot be broken down further by chemical means. Example: sodium, tungsten, and i

odine.
Chemistry
2 answers:
Mazyrski [523]3 years ago
7 0

The first answerer is correct. (Mark them Brainliest)

Hope this helps.

nlexa [21]3 years ago
5 0
Elements are substances that cannot be broken further down by chemical (or physical, for that matter) means. Sodium, tungsten, and iodine are all examples of chemical elements.
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Which statement best describes what occurs during a chemical reaction?
In-s [12.5K]

Answer:

bonds within the nucleus of reactants atoms are broken and rearranged to form new product atoms

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3 years ago
Describe the current model of the atom. Name the parts of this model and describe each part.
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Answer:

the electron cloud model is the current model of atom

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3 years ago
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Two students are given different samples of a substance and are instructed to determine the properties of the substance.
Hunter-Best [27]

The complete question is given below:

Two students are given different samples of a substance and are instructed to determine the properties of the substance.  

Which statement describes a property that will be the same for both students?

A. color because it is an extensive property

B. mass because it is an extensive property

C. boiling point because it is an intensive property

D. volume because it is an intensive property .

ANSWER

The correct option is C.

The physical properties of substances are divided into two, intensive and extensive properties.

Intensive properties refers to those features of a substance that do not depend on the quantity of the material that is available. Whether the sample available is big or small, the intensive properties remain the same. Examples of intensive properties are:  melting point, boiling point, refractive index, hardness, density color, etc. This question is asking us to look for an intensive property.

Extensive properties refers to those characteristics of a substance that depend on the amount of substance present. Examples of these properties are: mass, volume, size, weight, length, etc.

From the options given, option A is wrong because color is not an extensive property, it is intensive. Option B is wrong because the mass depend on the amount of sample given and the same thing apply to option D.

The correct option is C,  because no matter the quantity of that substance that you have, the boiling point will always remains the same.  

6 0
4 years ago
Which gas law is represented by the following equation: V1/T1 = V2/T2
jasenka [17]

Answer:

Charles's law

Explanation:

The expression:

     V1/T1 = V2/T2

represents Charles's law

The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".

 So,

    V1/T1 = V2/T2

Pressure and the number of moles are constant

V and T are the volume and temperature

1 and 2 are the initial and final states.

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3 years ago
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To support such answer, it must be noted that acupuncture is a traditional Chinese mode of pain-relieving through the insertion of extremely fine needles into the skin at specific points in the body known as "acupoints". This may relieve pain by releasing the hormone known as endorphins (happy hormone), which is the body's natural pain-killers and by affecting the brain part that governs serotonin- brain chemical which involved mood.
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