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sashaice [31]
3 years ago
12

Which substance can be broken down by chemical means?

Chemistry
2 answers:
zepelin [54]3 years ago
4 0
Methanol is the substance that can be broken down by chemical means, the remaining ones are elements.
bearhunter [10]3 years ago
4 0
4. Methanol

Methanol is a compoud. The rest of the choices are elements. Elements can't be broken down, and compounds can.
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A catalyst is used to increase the reaction rate of a chemical reaction.
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The answer would be C
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What mass is 8.9 moles of Ca?<br> 0.22<br> mole(s)<br> 8.9 moles of Ca x<br> grams<br> 8.9<br> grams
iren2701 [21]
Can you restate the questions again ?
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Consider the following statements.
Vsevolod [243]

Answer: B and C only

Explanation:

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Why do different isotopes of an element generally have the same physical and chemical properties?
tresset_1 [31]

Answer:

The correct answer is because they have same number of protons but different number of neutrons.

Explanation:

Isotopes are atoms of the same element but differ only in the number of neutrons in the nucleus, i.e. they have same atomic number but different mass number.

Mass number is affected as they have different number of neutrons, thus effecting their physical properties.

The number of electrons and protons are same, i.e. their atomic number is same and thus their chemical properties are same as chemical properties are determined by the atom’s electronic configuration and that relates to number of protons.

5 0
3 years ago
If 1.3 L of C3H8 combusts according to the equation below, how much CO2 will be produced?
SCORPION-xisa [38]

Answer:

0.162 moles of CO₂ are produced by this reaction

Explanation:

The reaction is:

C₃H₈(g) + 5O₂(g)  →  3CO₂(g) +4H₂O(g)

As we have the volume of propane, we need to know the mass that has reacted, so we apply density's concept.

Density = Mass / Volume → Density . Volume = Mass

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Then, 0.054 moles may produce (0.054 .3)/1 = 0.162 moles

6 0
3 years ago
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