CHEMISTRY MIDDLE SCHOOL

How many moles of hydrogen gas are generated when 4.0 moles of water react with excess calcium

Answers

Answer 1

Answer:

2moles of H2

Explanation:

First, let us generate a balanced equation for the reaction between calcium and water. This is illustrated below:

Ca + 2H20 —> Ca(OH)2 + H2

From the equation,

2moles of H2O produced 1mole of H2.

Therefore 4moles of H2O will produce = 4/2 = 2moles of H2.

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19. Which atom in a water molecule has the greatest electronegativity?a. one of the hydrogen atoms
b. both hydrogen atoms
c. the oxygen atom
d. There is no difference in the electronegativities of the atoms in a water molecule.

Answers

The oxygen atom in a water molecule has the greatest electronegativity. Therefore, the correct option is option C.

What is electronegativity?

The tendency of an atom of a particular chemical element could attract shared electrons while forming a chemical bond is represented by the symbol. The electronegativity of an atom is determined both by its atomic number as well as the distance between its valence electrons and the charged nucleus.

The higher the related electronegativity, the more electrons an atom or substituent group attracts. Electronegativity is a simple approach to quantify bond energy as well as the sign and degree of a bond's molecular polarity, that describes a bond all along continuum between covalent through ionic bonding. The oxygen atom in a water molecule has the greatest electronegativity.

Therefore, the correct option is option C.

To learn more about electronegativity, here:

brainly.com/question/1163776

#SPJ6

Answer:

The Oxygen Atom

Explanation:

Which of these is most likely to become a carbon film?O a dinosaur leg bone
O a sea creature's shell
O a flowering plant
O a tree trunk

Answers

A flowering plant

A sea creatures shell

Answer:

C- FLOWERING PLANT

Explanation:

100% on edge

A gas occupies 0.105 L at 105 K. At what Celsius temperature will its volume be 0.140 L? Assume that pressure remains constant. It would be great if you could show work!

Answers

This problem can be solved using the Combined Gas Law. The formula for it is

$(P_(1) V_(1) )/(T_(1) ) = (P_(2) V_(2) )/(T_(2) )$

Let's go ahead and plug in the known values. Since pressure remains the same, it does not matter what value we plug in, so let's assume 1 atm for both sides.

$((1 atm) (0.105 L))/((105 K)) = ((1 atm) (0.140 L) )/(x K)$

Now, we just need to solve for the unknown. Start by simplifying the left side and right numerator.

0.001 = $(0.140 L)/(x K)$

Multiply both sides by x.

0.001x = 0.140

Divide both sides by 0.001.

x = 140 K

Convert that to Celsius (K = C + 273)

140 = C + 273

C = -133

So, the volume of your gas will be 0.140 L at -133° C.

Compared to the physical and chemical properties of the compound NO2 the compound N2O has(1) different physical properties and different chemical properties

(2) different physical properties and the same chemical properties

(3) the same physical properties and different chemical properties

(4) the same physical properties and the same chemical properties

Answers

Answer: option (1) different physical properties and different chemical properties.

Justification:

1) Any chemical compound has its unique physical and chemical properties.

2) Although formed by the same elements, N and O, NO₂ and N₂O are different compounds, so each will have its proper physical and chemical properties.

3) The union of the atoms by chemical bonds confere the properties to a matter, so being the bonds in N₂O different to the bonds in N₂O means they are different compounds.

The periodic table is organized left to right by __________.Metals, nonmetals, metalloids

Metals, metalloids, nonmetals

Metalloids, nonmetals, metals

Nonmetals, metalloids, metals