CHEMISTRY HIGH SCHOOL

A lahar is a type of mudflow that occurs?A. after a volcanic eruption
B. before a hurricane make landfall.
C. after a severe thunderstorm
D. during a tornado

Answers

Answer 1
Answer: A lahar is a type of mudflow that occurs after a volcanic eruption. It is a sort of mudflow or trash stream made out of a slurry of pyroclastic material, rough flotsam and jetsam, and water. The material streams down from a fountain of liquid magma, normally along a waterway valley. Lahar is the most deadly by-products of the eruption because of the speed they can travel.
Answer 2
Answer:

A lahar is a type of mud flow that occurs?  The answer is, A. after a volcanic eruption.

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What is the percent composition of hydrogen in NH4HCO3?
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An element X belongs to 4th period and 17th group. Write the formula of the compound formed when it reacts with Y( atomic no.-13, mass no.27.)

Why is calcium harder than potassium?

Answers

Because calcium atoms have smaller radii than potassium atoms since calcium atoms have a greater nuclear charge. Each calcium atom will be closer to the delocalized electrons. Thus, the bonds in calcium will be stronger than that in potassium.

I NEED HELP!!!!Which group contains elements that are most likely to have similar properties?
A. lithium, beryllium, and boron
B. nitrogen, arsenic, and antimony
C. potassium, calcium, and gallium
D. cesium, platinum, and radon

Answers

Answer: The correct answer is option B.

Explanation:

Elements which lie in the same group most likely have similar chemical properties.

From the given options:

Option 1: Lithium, beryllium and boron.

Lithium lies in Group 1, Beryllium in group 2 and boron in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Option 2: Nitrogen, arsenic and antimony

All these elements lie in Group 15 of the periodic table and hence will have the same properties.

Option 3: Potassium, calcium and Gallium

Potassium lies in Group 1, Calcium in group 2 and Gallium in Group 13. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Option 4: Cesium, Platinum and Radon.

Cesium lies in Group 1, Platinum in group 10 and Radon in Group 18. As, these elements do not lie in the same group and hence, the properties of these elements will not be the same.

Therefore, the correct option is Option B.
the answer would be B. Because elements in the same group have similar properties.

Describe what happens to a hydrogen bond between two water molecules

Answers

Explanation:

Hydrogen atoms of one water molecule are attracted towards the oxygen atom of a neighboring water molecule can be termed as an intramolecular bond.

Generally, the oxygen atom is partially negatively charged, and the hydrogen atom is partially positively charged, so an arttraction occurs which forms this hydrogen bond. The attraction of the O-H bonding electrons towards the oxygen atom leaves a deficiency on the far side of the hydrogen atom relative to the oxygen atom. The result is that the attractive force between the O-H hydrogen and the O-atom of a nearby water molecule is strong.

What is electronegativity

Answers

When first looking at the word electronegativity, we see the word electro at the beginning so it has to do with electrons which have a negative charge.

Electronegativity is a chemical property and it's how much an atom will be attracted to somebody else's electrons. An atom's electronegativity is affected by its atomic number which is the number of protons in its nucleus and how far away the valence electrons are from the nucleus. Valence electrons are the outermost electrons.

Electronegativity is a measure of the tendency of an atom to attack a boding pair of electrons


I hope that's help !

Which element in the second period has the largest atomic radius? a potassium (K) b neon (Ne) c carbon (C) d lithium (Li)

Answers

The element in the second period that has the largest atomic radius is the Lithium (Li). The answer is letter D. As you go down the periodic table, the atomic radius increases and as you go across the periodic table, the atomic radius decreases.

Answer:

d lithium (Li)

Explanation:

What is the percent by mass of carbon in C10 H14 N2?

Answers

Answer: The percentage by mass of carbon in the given compound is 45.8 %

Explanation:

We are given a chemical compound having chemical formula C_(10)H_(14)N_2

To calculate the percentage composition of an element in a compound, we use the equation:

\%\text{ composition}=\frac{\text{Mass of carbon element}}{\text{Mass of compound}}* 100

In 1 mole of given compound, 10 moles of carbon atoms are there.  

Mass of C_(10)H_(14)N_2= [(10* 12)+(14 * 1)+(2* 14)]=262g/mol

Mass of carbon element = [10* 12]=120g/mol

Putting values in above equation, we get:

\%\text{ composition of carbon}=(120)/(262)* 100=45.8\%

Hence, percentage of carbon in given compound is 45.8 %.
Multiply the number of each element by its mass on the periodic table.

Add them together.

Put the mass of carbon only over the total mass and multiply the result by 100 to get the percentage.
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