CHEMISTRY HIGH SCHOOL

What is visible light?

Answers

Answer 1
Answer: It’s the portion of the electromagnetic spectrum that is viable to the human eye.


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A charged particle made up of several non-metallic atoms joined together is a(n) Select one: a. covalent ion b. polyatomic ion c. multivalent ion d. electron ion
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Which list of solutions is arranged in order from highest boiling point to lowest boiling point?

Objects 1 and 2 float as shown in the beaker below. Object 1 barely floats while 2 floats above surface. The density of the liquid in the beaker is 3.2 g/cc. Which of the densities given below are possible values for the densities of the two objects?

Answers

Object 1 is have more density than Object 2.

What is density ?

A material's density is a measure of how much stuff of a material has in a unit volume.

It is essentially a measured to see how tightly matter is crammed together or how a matter is compact.

For instance wood floats in water as it has lower density, while an anchor sinks as it has a higher density.

Helium balloons float in air as air has higher density than helium.

A specific gravity which is a related term to density otherwise called as relative density of a material.

It is the ratio of the density of a material to the density of water.

If the specific gravity of an object is less than one will float in water, where as  specific gravity greater than one means it will sink. Hence object 1 has more density.

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Objects 1 and 2 float as shown in the beaker below. Object 1 barely floats while 2 floats above surface. It means that Object 1 is denser than Object 2. 

How many images of a candle will be formed if it is placed between two plane mirrors inclined at an angle of 45?

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A candle placed between two plane mirrors inclined at an angle of 45 degrees will form 7 images. This is due to multiple reflections between the mirrors. The number of images depends on the angle between the mirrors.

In physics, when a candle is placed between two plane mirrors inclined at an angle of 45 degrees, 7 images will be formed. This happens due to multiple reflections between the mirrors. As per the formula for number of images n = 360/θ - 1, where θ is the angle between the mirrors, for an angle of 45 degrees, we get n = 360/45 - 1 = 7. The actual number of images can be less than this if they overlap each other.

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3. How many atoms are found in 0.000256 moles?

Answers

Answer:

1.54×10^20 atoms

Explanation:

It'sdonebyusingtherelation

N=n×Lwhere,

N=numberofentitiespresent

n=amountofsubstance (mole)

L=Avogadro'sconstantwhichis6.02×10^23

nowfromthequestion, given

n=0.000256

AndL=6.02×10^23

N=0.000256×6.02×10^23

N=1.54×10^20atoms

Which occurs when two fluorine atoms react to produce a fluorine molecule?(1) Energy is absorbed as a bond is broken.
(2) Energy is absorbed as a bond is formed.
(3) Energy is released as a bond is broken.
(4) Energy is released as a bond is formed.

Answers

The answer is 4. When atoms mix to create a compound, energy is continuously set off, and the compound has a lesser total energy. When a chemical reaction happens, molecular bonds are shattered and other bonds are made to create unalike molecules. For instance, the bonds of two water molecules are shattered to make hydrogen and oxygen.

The change that occurs when two fluorine atoms react to produce fluorine molecule is \boxed{\left( 4 \right){\text{ Energy is released as a bond is formed}}}.

Further Explanation:

The attraction between different atoms, molecules and ions is known as a chemical bond. Such bonds are responsible for the formation of chemical compounds.

An ionic bond is formed as a result of the interaction between a metal and a non-metal. Metals have the tendency to lose electrons while non-metals tend to gain electrons. Due to this, metal atoms form cations by loss of electrons and non-metals become anions with the gain of electrons.

A covalent bond is formed by the mutual sharing of electrons between the bonded atoms. It is also called molecular bond. Such bonds usually exist between two or more non-metals.

The atomic number of fluorine is 9 and it has a configuration of 1{s^2}2{s^2}2{p^5}. It is just one electron short of the stable configuration of neon. When two fluorine atoms approach each other, both share one of their valence electrons and form a single covalent bond. Since {{\text{F}}_{\text{2}}} formed has a complete octet, its stability is quite high. The two fluorine atoms tend to bond with each other to form fluorine molecule so energy is released during the process. Therefore option (4) is correct.

Learn more:

  1. Identification of ionic bonding: brainly.com/question/1603987
  2. What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: chemical bond, ionic bond, covalent bond, fluorine, 9, neon, stability, octet, configuration, electron, fluorine atoms, fluorine molecule. Energy.

The mass spectrum of a sample of a pure element is shown above. Based on the data, the peak at 26amu represents an isotope of which of the following elements? A) Al with 13 neutrons
B) Mg with 14 neutrons
C) Fe with 26 neutrons
D) Ti with 26 neutrons

Answers

The correct answer is option B: Mg with 14 neutrons

The mass spectrum shows the charge to mass ratio of atoms. I can be used to sort the isotopes of an element.

Isotopy is a phenomenon in which atoms of the same element have the same atomic number but different mass numbers.

The mass spectrum of atoms separates atoms on the basis of charge to mass ratio of the isotopes.

The isotopes of magnesium are;  24Mg atom which has 12 neutrons 25Mg which has 13 neutrons, and  26Mg which has 14 neutrons.

Hence, the peak at 26amu represents 26Mg which has 14 neutrons.

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Answer:

The answer is B

125 cm3 of a solution contains 0.25 moles of the solute. What is the concentration of the solution?

Answers

Answer:

Explanation:

125 cm3 -> 0.125 L

M = no. mole / volume (L)

M = 0.25 / 0.125 = 2 M
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