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3 years ago

Please HURRYYYYYYYYYY

2 answers:

6 0

The periodic table is divided into 18 group. A group refers to a column of elements in the periodic table. All the elements in the same group share the same chemical and physical properties. Some of the groups are given specific names while the rest are identified by the first element in that group. The groups with specific names are as follows:
Group 1: Alkali metals
Group 2: Alkali earth metals
Group 11: Coinage metals
Group 15: Pnictogen
Group 16: Chalcogens
Group 17: Halogens
Group 18: Noble gases.

tia_tia [17]3 years ago

4 0

Elements of section s: are those elements whose valence shells are s¹ or s².

This section includes group 1 and 2.

Group 1: Alkalyne metals (Li, Na, K, Rb, Cs, Fr): react violently with water.

Group 2. Alkalyne earth metals (Be, Mg, Ca, Sr, Ba, Ra: react less violently with water.

Elements of both group 1 and group 2 shine, are conductive and are malleable and ductile.

Elements of section p: are those elements whose valence shells are p¹, or p², or p³, or p⁴, or p⁵, or p⁶.

This section includes the groups 13, 14, 15, 16, 17 and 18.

Most of those elements and non-metals except for B, Si, Ge, As, Sb, Te and Po which are metalloids (they have some characteristics of metals and some characteristics of non-metal).

Non metals are brittle and poor conductive.

Elements of section d is the biggest group. These are transition metals. In this group the electrons fill the type d orbitals.

This section includes groups 3 through 12.

The properties of these elements are those of metals: high conductivitiy, mallability and electrical conductivity.

Elements of section f are other transition metals (inner transition metals). They partially fill some f orbitals.

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What is the half-life of A? What will the pressure, initially 32.1 kPa, at

kodGreya [7K]

Answer:

a) 32.09 kPa

b) 32.09 kPa

Explanation:

Given data:

rate constant $= 3.56\times 10^{-7} s^{-1}$

initial pressure is = 32.1 kPa

half life of A is calculated as

$t_{1/2} = \frac{ln 2}{k}$

$t_{1/2} = \frac{ln 2}{3.56\time 10^{-7}}$

$t_{1/2} = = 1.956 \times 10^6 s$

for calculating pressure we have follwing expression

$ln p = ln P_o - kt$

$P =P_o e^{-kt}$

a) $P = 32.1 e^{-3.56\times 10^{-7} \times 10} = 32.09 kPa$

b) $P = 32.1 e^{-3.56\times 10^{-7} \times 10\times 60} = 32.09 kPa$

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3 years ago

Bread is made by mixing flour, water, and yeast together and then baking. How does the example of bread tell the difference betw

Shtirlitz [24]

Answer:

5 measuring spoons

Explanation:

got 100% on edge

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2 years ago

How is a carbon atom different from a hydrogen atom?

Sloan [31]

Answer:

Carbon atom is a chemical element with the symbol C and atomic number 6 ( electrons). While Hydrogen atom is an atom of the chemical element hydrogen that have only 1 electron.

Explanation:

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3 years ago

Why is there such great diversity among organic compounds?

weqwewe [10]

The best and most correct answer among the choices provided by the question is the first choice "carbon has many allotropes"

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I hope my answer has come to your help. God bless and have a nice day ahead!

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3 years ago

Sulphur dioxide is a common pollutant from burning coal.State two effects caused by this pollutant and also write the chemical e

frozen [14]

Heya!

Sulfur dioxide - ( SO2 )

Answer:

Sulfur dioxide is a common pollutant caused due to the burning of coal,Is very harmful for the environment and health.

Effects:

Health effects-Sulfur dioxide effects the respiratory system which includes the functioning of lungs,respiratory track and causes infections,can also effect and irritate the eyes and causes aggravating conditions such as asthma and chronic bronchitis.
As most sulfur dioxide air pollution comes from the burning of coal and oil in power plants. It is a emitted by trains, large ships and other diesel objects that burns alota sulfur fuel so this also effects the environment like plants and others as the air lacks oxygen ,but with more sulfur dioxide.

Hope this helps!

Have a nice day!:)

6 0

3 years ago

Read 2 more answers