CHEMISTRY HIGH SCHOOL

A 10.0-gram sample of which element has the smallest volume at STP?(1) aluminum (3) titanium
(2) magnesium (4) zinc

Answers

Answer 1
Answer: Since all of these elements are under the same conditions, volume only varies based on the number of atoms present. You can find the number of atoms in a given sample by dividing the weight of the sample by the molar mass.

Aluminum has a molar mass of 26.9 so 10/26.9 = .371 moles

go on to get Ti= 10 /  47.88 =.209 moles

Mg = 10.0 / 24.3 = 0.412 moles

Zn = 10 / 65.37 = .153 moles

Since there are less moles of Zn, it has the smaller volume at STP than the other elements.

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Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO 2Hg + O2 The molar mass of HgO is 216.59 g/mol. The molar mass of O2 is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O2? 3.906 7.813 15.63 73.87

Answers

Answer:

15.63

Explanation:

250g O2 x 1 mol O2 x 2mol HgO / 32 g O2 x 1 mol O2

Which process represents a chemical change?(1) melting of ice(2) corrosion of copper(3) evaporation of water(4) crystallization of sugar

Answers

Answer:

             Corrosion of Copper is a chemical change.

Explanation:

                   Copper like Iron when come in contact with moisture and oxygen oxidized and corrodes according to following equation,

                                             4 Cu  +  O₂    →   2 Cu₂O

This corrosion results in lost of conductivity, strength and luster of copper. As in this reaction two substances i.e Cu and O₂ are reacting to produce a completely new substance i.e. Cu₂O hence, it is declared as chemical change.

The process which represents a chemical change is (2) corrosion of copper.

FURTHER EXPLANATION

Matter may undergo two types of changes: physical or chemical change.

Physical change involves changes in appearance, size, and other physical properties of a substance. There is no change in the composition or identity of the substance. Examples of physical changes are changes of state and change in size.

Chemical changes are changes wherein the composition or identity of the substance is altered. The properties of the substance changes. This involves formation of a new substance due to the rearrangement of atoms. Examples of chemical change are burning and rotting.

  1. Melting of Ice is a physical change. It is only a state change from solid to liquid.
  2. Corrosion of copper is a chemical change. A new substance forms when copper is corroded and there is a change in the property of the substance. Copper is a conductor but copper oxide is not.
  3. Evaporation of water is a physical change. It is a state change from liquid to vapor.
  4. Crystallization of sugar is a physical change. The composition of sugar remains the same and no new chemical bonds are formed.

LEARN MORE

  1. chemical and nuclear reaction brainly.com/question/9566647
  2. rusting brainly.com/question/973790

Keywords: physical change, chemical change

In a chemical change, the same atoms are recombined into a new substances,
True
Or False

Answers

True. In a chemical change, the same atoms are recombined into a new substances,

What happens in a chemical change

In a chemical change, also known as a chemical reaction, the atoms of the reactants are rearranged and recombined to form new substances with different chemical properties.

While the atoms themselves are not created or destroyed, their arrangement and bonding patterns change, resulting in the formation of new molecules or compounds. This process involves breaking and forming chemical bonds, leading to the creation of different substances with distinct properties from the original reactants.

Learn more about chemical change

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Atoms from DIFFERENT elements can combine to make a new substance so I would say that one is false sorry if Iam wrong :( i think it’s right because it produces a new substance with different or new atoms

The reaction of a Lewis acid with a Lewis base would most likely be accompanied by an increase in which item?covalent bonds

hydronium ions

electron pairs

hydroxide ions

Answers

The correct option is COVALENT BONDS.

A Lewis acid is defined as a substance which accept a pair of electron while a Lewis base refers to a substance that donate an unshared pair of electrons to another chemical specie with which it shared the donated pair of electrons.

Lewis acid and Lewis base react together to form salt and water. This type of reaction is called neutralization reaction. The neutralization reaction of Lewis acid and Lewis base involves electron pairs transfer, thus, there is an increase in the number of covalent bonds during this reaction.

Answer:

The correct answer is "covalent bonds".

Explanation:

A covalent coordinated or dative bond is formed when two atoms are linked together, sharing a pair of electrons. But only one of these atoms is the one that brings the pair of shared electrons. For this type of bond to occur, it is required that the donor atom has a pair of free electrons in an outer orbital and the acceptor atom has the capacity to receive that pair of electrons in its last valence layer.

On the other hand, a Lewis base is a substance that can share or donate a pair of electrons, because they have a pair of solitary electrons. A  Lewis acid is that substance that accepts or takes a pair of electrons because they have their last electron layer incomplete.  

It is then possible to say that an Lewis acid-base reaction is formed by the Lewis acid and base joined by a coordinated covalent bond.

So, the correct answer is "covalent bonds".

What does mitochondrial exactly mean ?

Answers

mitochondrial is a disease that has long-term side effects that is often inherited. Due to this, your body may fail to produce energy effectively.

When both forward and reverse changes are physical changes, the resulting equation represents a _____. a. physical equilibrium
b. chemical equilibrium
c. reversible reaction
d. none of the above

Answers

When both forward and reverse changes are physical changes, the resulting equation represents a physical equilibrium. The correct answer is A. 

Answer:

1.A

2.FALSE

3.C

100%
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