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4 years ago

Which substance is a compund

1 answer:

7 0

Answers:
______________________________________________
1) [D]: " CO₂ " .

<u>Note:</u><u> </u> This is the only answer choice given that is composed of: "at least two different elements" .
_______________________________________________
2) [D]: "carbon and hydrogen" {"C" and "H" .} .
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Which of these is an indication that a chemical reaction has occurred?

grandymaker [24]

C. The formation of precipatation

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3 years ago

When ethane (C2H6) burns, it produces carbon dioxide and water:

Hatshy [7]

When 2 moles burn 6 moles of O2 is produced !

so for 16 moles , (6/2)×16= 48 moles will be produced !

so answer is A , 48 moles !

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3 years ago

Read 2 more answers

HELP!!!! 20 POINTS

steposvetlana [31]

Answer:

B. 10⁻⁶ m

Explanation:

Frequency is the inverse of period, which is correlated with its wavelength. In other words, the smallest wavelength will give you the highest frequency.

10⁻⁶ m is the smallest value in the answer choice so that's your answer.

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3 years ago

Which of the following is an example of a solution?

neonofarm [45]

Air is an example of a solution. The other two answers are incorrect because they are heterogenous mixtures, not homogenous mixtures(another name for solution).

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3 years ago

Which statement about subatomic particles is true?

Dafna1 [17]

The correct statement about subatomic particles is Electrons are the subatomic particles with the smallest mass.

The mass of protons and neutrons which are considered as 1 unit of mass of atoms is approximately 1836 times the mass of the electron

$\boxed {\boxed {\bold {Further ~ explanation}}}$

Atoms are composed of 3 types of basic particles namely protons, electrons, and neutrons

The mass of this basic particle is expressed in units of atomic mass

This atomic unit uses the standard atomic mass, that is, the C-12 isotope

1 atom C-12 = 12 atomic mass units

1 atomic mass unit = 1/12 x mass 1 C-12 atom

1 unit of atomic mass = 1.66.10⁻²⁴

the mass of each basic particle in atomic mass units is:

electron mass = 9.11.10⁻²⁸

proton mass = 1.6726.10⁻²⁴

neutron mass = 1,675.10⁻²⁴

The proton mass is considered to be equal to 1 atomic mass unit and a neutron which is also considered to be equal to 1 atomic mass unit

The charge of 1 proton is equal to a charge of 1 electron but has a different sign

The proton is positively charged (+1), the electron is negatively charged (-1). and neutrons not charged (neutral)

For a charge of 1 electron = e = 1.66.10⁻¹⁹ coulomb

Whereas the neutron charge = 0

Let's look at the answer choices

1. Protons are the only subatomic particles to have a charge.

This statement is wrong because in the nucleus there are electrons charged -

2. Electrons are the subatomic particles with the smallest mass.

The statement is true because the mass of protons and neutrons which are considered as 1 unit of mass of atoms is approximately 1836 times the mass of the electron

3. Neutrons orbit the nucleus of the atom.

This statement is wrong.

It can be explained by the Bohr atomic model, where electrons circulate the nucleus on a particular path so that electrons are not attracted to the nucleus.