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iragen [17]
3 years ago
8

Which of the statements about elements is true?

Chemistry
2 answers:
Lapatulllka [165]3 years ago
5 0

Answer:

No two elements have the same kind of atom.

Explanation:

Jet001 [13]3 years ago
3 0

1. No two elements have the same kind of atom.

Explanation:

The correct of all statement is that no two elements have the same kind of atoms.

Every element have different atoms.

  • Over a hundred elements have been identified by scientists.
  • Atoms are the smallest particles that takes part in chemical reactions.
  • Elements are distinct substances that cannot be split.
  • Atoms of all elements do not have the same mass and volume. Isotopes are examples.
  • It is true that atoms of all elements have different masses and also different volumes.
  • The volume of an atom is function of the number of electrons it contains.

learn more:

Dalton model of the atom brainly.com/question/1979129

#learnwithBrainly

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Calculate the mean rate of reaction when 23 cm<br> of gas<br> is produced in 15 seconds.
katrin2010 [14]

Answer:

1.53 cm/s

Explanation:

Rate = Length/time

        = 23/15

        = 1.53 cm/s

<u>BRAINLIEST?</u>

<u>PRETTY SURE IT IS.</u>

3 0
2 years ago
How many hydrogen atoms are in each molecule of trisilylamine?
lord [1]

Answer:

  • <u>9</u>

Explanation:

The amine functional group is obtained by subsititution of one or more hydrogen atoms in the ammonia compound.

Ammonia is NH₃.

Then,

  • by substituting one hydrogen you obtain R - NH₂.

  • by substituting two hydrogens you obtain R' - NH - R''

  • by subsituting the three hydrogens you obtain:

                        R'''

                         |

                 R' -  N - R''

In this case, the three subsitutuents are silyl groups. The silyl group is derived form silane and is SiH₃. So, the tcompound <em>trisilylamine</em> is:

                    SiH₃

                      |

          SiH₃ -  N - SiH₃

Thus, you can count 3 hydrogen atoms for every silylgroup for a total of <u><em>9 hydrogen atoms in each molecule of trisilylamine.</em></u>

7 0
3 years ago
What is the MOST important advantage of using ethanol as a fuel
wolverine [178]

Answer:

The correct answer is - A. Ethanol reduces air pollution.

Explanation:

Ethanol is believed to be better fuel for the environment than other petroleum fuels. Ethanol emits lower carbon dioxide as it is clean smokeless fuel, and produces less or the same oxides of nitrogen and hydrocarbons.

It is produced by the process of fermentation of molasses by yeast. Mixing it with the other fuels is found to be CO2 reduces by 30% of emissions to the atmosphere.

7 0
3 years ago
What is the wavelength of a sound wave moving at 340 m/s with a frequency of 256 Hz?
777dan777 [17]
The  wavelength  of  a sound  wave  moving  at 340  m/s  and   with  a frequency of  256  Hz   is  calculated using the  the below  formula

wavelength =  speed  of the  wave/frequency

speed  of  the  wave = 340 m/s
frequency = 256 Hz

wavelength  is therefore =  340/256 =  1.32 m
5 0
3 years ago
brimine and chlorine are in group 7 and they both form diatomic molecule. however bromine molecule exist as liquid at room temp
Ne4ueva [31]

Answer: difference in Vander Waals forces

Explanation:

The intermolecular force of attraction between the molecules in chlorine is WEAKER than that of Bromine.

This force is known as VANDER WAALS forces. And it DECREASES down the group; so Chlorine which is placed higher is a GAS, while Bromine placed lower in Group 7 is a LIQUID.

6 0
3 years ago
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