Which list of elements from Group 2 on the Periodic Table is arranged in order of increasing atomic radius?(1) Be, Mg, Ca (3) Ba, Ra, Sr
(2) Ca, Mg, Be (4) Sr, Ra, Ba

Answers

Answer 1

Answer: The correct answer is option 1. Be, Mg, and Ca is the correct order arranged in increasing atomic radius. This is predicted based on the periodic table. The atomic sizes increases as one moves downwards in the periodic table.

Answer 2

Answer:

Answer: Number 1

BE, MG, CA

Explanation:

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Compounds have similar properties to the elements of which they are made.For example, FeS is magnetic and smelly, since iron (Fe) and sulfur (S) are attracted to a magnet, and possess an odor of eggs,
respectively

True
False

Answers

Answer:

false

Explanation:

The properties of compounds are often very different from the properties of the elements that make them. For example, water is made from two atoms of hydrogen bonded to one atom of oxygen. ... The elements calcium and chlorine combine to form the compound calcium chloride. Calcium is a soft, silvery metallic solid.

Answer:

the answer is False

Explanation:

False

Hope this helps

The respiratory system takes oxygen into the human body and expels carbon dioxide. Which body system interacts with the respiratory system to transport these gases to and from the various parts of the body?A. the nervous system
B. the digestive system
C. the urinary system
D. the circulatory system

Answers

The answer is D, the circulatory system.

Answer:

The answer is D, the circulatory system.

Explanation:

I got a a on the test

What is the total number of moles of atoms in Pb(C2H3O2)2?

Answers

The total number of moles of atoms in Pb(C₂H₃O₂)₂ is 66.242 x 10²³ atoms.

What is mole?

The total number of moles of atoms, use Avogadro's number, which is approximately 6.022 x 10²³ particles (atoms or molecules) per mole.

The molecular formula of Pb(C₂H₃O₂)₂ has one lead (Pb) atom, two carbon (C) atoms, four hydrogen (H) atoms, and four oxygen (O) atoms in one molecule of the compound.

So, the total number of moles of atoms in one mole of Pb(C₂H₃O₂)₂ can be calculated as follows:

1 Pb atom x (1 mole Pb / 1 mole Pb(C₂H₃O₂)₂ x (6.022 x 10²³ atoms / 1 mole Pb) = 6.022 x 10²³ Pb atoms

2 C atoms x (1 mole C / 1 molePb(C₂H₃O₂)₂ x (6.022 x 10²³ atoms / 1 mole C) = 12.044 x 10²³ C atoms

4 H atoms x (1 mole H / 1 mole Pb(C₂H₃O₂)₂ x (6.022 x 10²³ atoms / 1 mole H) = 24.088 x 10²³ H atoms

4 O atoms x (1 mole O / 1 mole Pb(C₂H₃O₂)₂ x (6.022 x 10²³ atoms / 1 mole O) = 24.088 x 1023 O atoms.

6.022 x 10²³ Pb atoms + 12.044 x 10² C atoms + 24.088 x 10²³ H atoms + 24.088 x 10²³ O atoms = 66.242 x 10²³ atoms

Therefore, there are approximately 66.242 x 10²³ atoms in one mole of Pb(C₂H₃O₂)₂.

To learn more about the mole, follow the link:

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1 mole of atoms is in Pb(C2H3O2)2?

the formula of aluminium sulphide is Al₂S₃. Explain why the formula has a ratio of two aluminium ions for every three sulphide ions.

Answers

Molar mass of Al = 27.0 g/mol
Molar mass of S = 32.1 g/mol
Molar mass of Aluminium sulfide = 27.0 x 2 + 32.1 x 3 = 150.3 g/mol
% of Al (there are 2 Al atoms) in Aluminium sulfide = $(54.0)/(150.3) * 100 = 35.9%$
% of S (there are 3 S atoms) in Aluminium sulfide = $(96.3)/(150.3) * 100 = 64.1%$
Assume the percentages to be masses, so:
In 100.0 g of Aluminium sulfide, n (Al) = $(35.9)/(27.0) = 1.33 mol$
In 100.0 g of Aluminium sulfide, n (S) = $(64.1)/(32.1) = 2.00 mol$
Convert values to a molar ratio,
1.33 : 2.00
Divide by smallest ratio value,
1 : 1.50
Multiply each ratio value by a factor of 2 to eliminate the decimal,
2 : 3

Hence why the empirical formula of Aluminium sulfide is $Al_(2) S_(3)$

Select all that apply.Hydraulic systems work because _____.
liquids are incompressible
pressure is transmitted equally throughout a liquid
gases are incompressible
pressure and force are the same thing

Answers

Answer;

Liquids are incompressible
Pressure is transmitted equally throughout a liquid

Explanation;

-Hydraulic systems works on the idea that, unlike gasses, liquids cannot be compressed. Therefore, a system that transfers pressure through liquid to aid in the lifting of an object can be created.

-Force that is applied at one point is transmitted to another point using an incompressible fluid. This force is created on the piston which generates or creates a pressure that will be transmitted equally to all parts of the system, then to the load and this pressure creates a force that will lift the load on the load piston.

because liquids are incompressible

What is the freezing point of an aqueous solution that boils at 105.0 ∘C? Express your answer using two significant figures.

Answers

The boiling point of standard water is 100 degree Celsius, with the addition of solute the boiling point is elevated. The freezing point of the solution will be -18.04 degree Celsius.

What is boiling point?

The boiling point is the temperature at which the liquid is converted to vapor. The change in boiling point of the aqueous solution gives the molality of the solution as:

$\rm \Delta T=ebuliloscopic constant\;*\;molality\;*\;von't\;hoff\;factor\n105^\circ C-100^\circ C=0.512^\circ C.kg/mol\;*\;1\;*\;m\n9.7\;mol/kg=m$