CHEMISTRY MIDDLE SCHOOL

How are chemical changes of matter related to the organization of the periodic table

Answers

Answer 1
Answer:

Chemical changes of matter are related to electronic configuration which is same along a group in case of valence shell in the periodic table.

What is periodic table?

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

Learn more about periodic table,here:

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Answer 2
Answer: The elements are organized in groups, and the groups have the same chemical properties, therefore having similar chemical changes. 

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4) How many grams are there in 7.40 moles of AgNO37

Answers

Answer:

1258 grams of AgN03

Explanation:

We calculate the weight of 1 mol of AgN03:

Weight 1 mol AgN03= Weight Ag + Weight N +( Weight 0)x3=108g+ 14g+16gx3=170 g/mol

1 mol----170 g AgN03

7,4mol---x= (7,4 mol x170 g AgN03)/1 mol=1258 g AgN03

Sandstone and slate are used for building, but these rocks have different properties. Which rock would you use for a use for roof? Which would you use the walls of a building? Explain. Please help ty

Answers

Slate is a natural stone that splits easily into thin sheets. A sheet of slate can be cut into shingles that provide excellent protection against rain and melting snow, and it is very dense and hard, therefore it is highly resistant to being reshaped or damaged by weather. Sandstone can be broken into flat layers that can then be broken into squared-off chances. These pieces of squared-off sandstone serve well in construction of walls for buildings. 

You place ice cubes into a glass of lemonade what happens to make the lemonade to get cold

Answers

When we place ice cubes into a glass of lemonade then transfer of thermal energy from lemon water to ice cubes takes place.

What is transfer of energy?

Transfer of energy means the transformation of energy from one form to another form or from one place to another place.

When we place ice cubes into a glass of lemonade, as we know that the temperature of ice cubes is low and it has low thermal energy and the temperature of lemonade is high and have a high thermal energy as compared to ice cubes. In this condition thermal energy goes from lemonade to the ice cube till they both have same thermal energy.

Hence, transfer of thermal energy takes place.

To know about transfer of energy, visit the below link:
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The heat energy from the room temperature lemonade transfers to the cold ice cubes, causing the temperature of the lemonade to drop and the temperature of the ice cube to rise until they are equal to each other.

Which metal is most likely to be formed easily intothin sheets?
o scandium
o chromium
O gold

Answers

Answer:

answer is gold

Explanation:

bcz gold is having a property of malleable so it can be drawn into thin sheets

It is gold because it is an extremely malleable metal, and others like Scandium and Chromium are less malleable, as compared to Gold.

Scientists predicted Adamantium would have an Atomic radius of 327 pm. Once the element was measured experimentally, they found that the atomic radius was really 312 pm. Calculate the percent error of their prediction

Answers

The actual atomic radius of Adamantium is 327pm. The experimentally estimated value of atomic radius of adamantium is 312pm. The percent error can be calculated as,

Percent error = (actual value-estimated value)/actual value *100

                       = 327-312/327*100

=Approx. 5 percent error in their prediction.

Of the following metals, which is the LEAST reactive? A. K
B. Ca
C. Na
D. Mg

Answers

Answer: D. Mg

Explanation:

Chemical reactivity is defined as the tendency of an element to loose of gain electrons.

Metals are the elements which lose electrons and hence, their chemical reactivity will be the tendency to lose electrons.

Their chemical reactivity increases as we move top to bottom in a group because the valence shell come gets far away from the nucleus. Thus, the loss of electron from the valence shell becomes easier due to lesser attraction between nucleus and valence electron.

Their chemical reactivity decreases as we move from left to right in a period .As, the electrons get added up in the same shell, the electron in the outermost orbital gets near to the nucleus. And hence, the electron will be difficult to lose.Thus, the chemical reactivity of metals decreases.

For the given options:

Potassium(K) belongs to Group 1 and period 4 of the periodic table.

Calcium (Ca) belongs to Group 2 and period 4 of the periodic table.

Sodium (Na)belongs to Group 1 and Period 3 of the periodic table.

Magnesium (Mg) belongs to Group 2 and Period 3 of the periodic table.

Order of reactivity of metals follow:

K>Ca>Na>Mg

Thus the LEAST reactive metal is Magnesium.
The Answer Should Be D.Mg
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