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Vesna [10]
3 years ago
5

Which statement best describes chemical properties of matter? Chemical properties, such as density, must be observed when a subs

tance is in its natural state at room temperature and normal atmospheric pressure. Chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure. Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form. Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.
Chemistry
2 answers:
alisha [4.7K]3 years ago
6 0
Chemical properties of matter can only be observed and measured by performing a chemical change.
- Density and boiling are not chemical changes.
- This leaves reactivity and combustion. Reactivity does not need to be observed at STP so the statement is wrong.

Combustion is the best answer. 

bearhunter [10]3 years ago
4 0

Answer:

The anwser is C. combustiblity

Explanation:

I took the test

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In metallic bonds, the mobile electrons surrounding the positive ions are called a(n)?
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Answer: In metallic bonds, the mobile electrons surrounding the positive ions are called <u><em>dipole</em></u>.

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3 years ago
Сульфат железа (II) окисляется в кислой среде перманганатом калия до Fe2(SO4)3, т.е. окисляется. Запишите и приравняйте уравнени
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Answer:

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3 years ago
In water, hydrogen bonds are best described as _____.
Elina [12.6K]

Answer: Option D) covalent bonds between water molecules

In water, hydrogen bonds are best described as covalent bonds between water molecules

Explanation:

The hydrogen bonds between water molecules are covalent bonds because they are formed when oxygen attract the lone electron in hydrogen, thus resulting in the formation of a partially negative charge on the oxygen atom and a partially positive charge on two hydrogen atoms

Thus, the sharing of electrons between oxygen and hydrogen atoms is responsible for the covalent bonds between water molecules

7 0
3 years ago
Compared to the charge of a proton the charge of an electron has
mart [117]

Answer:

Compared to the charge of proton the charge of an electron is negative.

Explanation:

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All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

For example

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Electron:

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Symbol= e-

Mass= 9.10938356×10-31 Kg

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Neutron and proton

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

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5 0
3 years ago
Which statement regarding the Calvin cycle is false?
scoundrel [369]

Answer:

The statement "Six turns of the cycle are required for every glucose molecule later produced in non–Calvin cycle reactions" is incorrect.  It really looks not well-worded.

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It is incorrect because Six turns of the cycle are required for every glucose molecule produced in Calvin cycle reactions, no in non-Calvin cycle reactions.  This process includes the fixation of 6 molecules of carbon dioxide to produce 1 Glucose (seen as the addition of the two Phosphoglyceraldehide molecules (PGAL).  Moreover, the other statements in the questions are correct:

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NADPH is required for reduction and sugar production.

3 0
3 years ago
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