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Tcecarenko [31]
2 years ago
11

• An element in group 2, period 4 has similar properties with

Chemistry
1 answer:
babymother [125]2 years ago
7 0

Answer:  Elements in Group 2

Explanation:  The periodic table was arranged by Dmitri Mendeleev specifically  around similarites in their chemical behaviors.  He found that as atomic number increases, at some point an element starts to react in a manner similar to a previous one.  When that happened, he would place the larger element under the smaller one, and eventually noticed a periodicity in the table.  Elements in a column (Groups) had similiar chemical properties.  We know today that these similarities are due to the electron configuration, and that these configurations repeat themselves.  He left gaps in the table when he could find an existing element with properties similar to others in that group.  I big leap of faith, but it worked.  Elements for those missing boxes were eventually discovered.

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Which of the following can be separated by physical means: a compound or a mixture. Explain.
sineoko [7]

Answer:

a mixture

Explanation:

in a mixture the substances havent chemically combined so it is easy to just separate them through physical means

4 0
3 years ago
Which of the following statements is not a description of neptune?
KIM [24]
The appropriate answer is B. Has no atmosphere. Neptune is a gas giant and is the eight planet in the solar system. It has a thick atmosphere consisting of hydrogen, helium and methane. Neptune has at least eight moons with Triton being the largest.

Neptune has four rings which circle the planet. The rings are made of dust particles, similar to the rings of Saturn.
6 0
3 years ago
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How many atoms are in a sample of chromium with a mass of 31 grams? O a 2.4 x 1024 atoms of chromium b 3.6 x 1023 atoms of chrom
lukranit [14]

Answer:

b. 3.66x10²³ atoms of chromium.

Explanation:

First we calculate how many moles are there in 31 grams of chromium, using its molar mass:

  • Molar Mass of Chromium = 51 g/mol (This can be found on any periodic table)
  • 31 g ÷ 51 g/mol =  0.608 mol

Then we <u>calculate how many atoms are there in 0.608 moles</u>, using <em>Avogadro's number</em>:

  • 0.608 mol * 6.023x10²³ atoms/mol = 3.66x10²³ atoms

The correct answer is thus option b. 3.66x10²³ atoms of chromium.

4 0
3 years ago
Puzzle: A man stands on a road in Iowa looking up at the night sky. On one night he sees the constellation Orion. But on another
nasty-shy [4]

Answer:

altho I don't believe in supper stision I would say that Scorpius has killed Orion.

5 0
2 years ago
Distinguish between temperature and thermal energy
MissTica

Answer:

<u>The difference between temperature and thermal energy is that temperature measures the average kinetic speed of molecules and thermal energy is the total kinetic energy of all particles in a given substance.</u> Convection occurs when energy is transferred while the mass of a substance moves. The temperature is measured in Celsius, Kelvin, and Fahrenheit. The temperature does not depend on the quantity of the substance – it is related to the average kinetic energy of the particles. The thermal energy depends on the quantity of the substance – it is related to the total kinetic energy of the particles.

7 0
3 years ago
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