The chart shows the percentage of different elements in the human body. Which element is the most prevalent in the human body?

nitrogen
hydrogen
carbon
oxygen

Answer:

C. Trigonal pyramidal

Explanation:

According to the valence shell electron pair repulsion theory, the shape of ammonia is trigonal pyramidal in nature.

The bond angle is 107° and it has bond pair of 3 and lone pair of 1.

A tetrahedral is exhibited by methane

Trigonal planar is exhibited by BF₃

The pH of a buffer solution : 4.3

Given

0.2 mole HCNO

0.8 mole NaCNO

1 L solution

Required

pH buffer

Solution

Acid buffer solutions consist of weak acids HCNO and their salts NaCNO.

[tex]\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}[/tex]

valence according to the amount of salt anion  

Input the value :

[tex]\tt \displaystyle [H^+]=2.10^{-4}\times\frac{0.2}{0.8\times 1}\\\\(H^+]=5\times 10^{-5}\\\\pH=5-log~5\\\\pH=4.3[/tex]

Answer:

Hi... Your answer is total force

Answer:

True................

Answer:

true

Explanation:

The letter in parentheses after a chemical formula indicates c) the physical state of the substance.

The letters can be:

→ (s) for solid.

→ (l) for liquid.

→ (g) for gazeous.

→ (aq) for an aqueous solution (like NaCl (aq) - NaCl is dissolved in water)

Answer:

Molecule

Explanation:

Answer:

molecule

Explanation:

............

Answer:

16.8768 g

Explanation:

The reaction that takes place is:

First we convert the mass of hydrogen and oxygen into moles, using their respective molar masses:

There are significantly less oxygen moles than hydrogen moles, so oxygen is the limiting reactant.

We calculate the produced moles of water, using the moles of the limiting reactant:

Finally we convert water moles into grams, using its molar mass:

Answer:

a) Soft

b) low density

c) low melting point

d)reactive with water

Answer:I need the options

Explanation:

Answer:

A, 4Fe 3O2 → 2Fe2O3

Answer:

[tex] \huge \boxed{TRUE}[/tex]

Explanation:

Liquid molecules have more room to slide past one another which is why they can easily change shape.

Answer:B

Explanation:

Answer: Option (A) is the correct answer.

Explanation:

When there occurs no change in the chemical composition of a substance then it is known as physical property.

For example, mass, volume, density are all physical properties.

Since, the mass of an electron is negligible and an electron holds a negative charge.

Therefore, negatively charged particle with very little mass accurately describes the physical properties of electrons in atoms.

Answer:

560000 cg

Explanation:

5.6 x 10^3 = 5600

1 g = 100 cg

5600 g = 560000 cg

Answer:

A small mass of positive charge was discovered in the center of the atom.

Explanation:

Atoms is the combination of protons, neutrons, as well as electrons particles. The particles that are in the centre of atom is Protons and neutrons, which made up the nucleus, this nucleus is surrounded by electron.

The discovery that directly caused scientists to revise this model of the atom is that A small mass of positive charge known as proton, and a positive charge particle was discovered by Ernest Rutherford, in the center of the atom in the year 1900. Ernest Rutherford through his research resulted to splitting of the atom during nuclear reaction and proton was discovered.

Answer:

The acceleration of the car will increase drastically

Explanation:

Based on newtons second law of motion, the force applied on a body is directly proportional to the product of its mass and acceleration;

     Force  = mass x acceleration

Since the mass of the car is constant, an increase in force will cause an increase in acceleration.

A decrease in the force will impact a lesser acceleration on the motor car.

This way, the change in velocity of the body per unit of time will increase drastically.

Answer:

Corrosion

Explanation:

Silver is known as a noble metal. Noble metals are those metals that are resistant to corrosion.

However, we can not say that silver is completely resistant to corrosion because silver can corrode when exposed to air and sulphur.

Exposure to air and  sulphur leads to the coating of the silver with a sulphide layer thereby making the metal to become tarnished and loose its metallic luster.

Answer:

A

Explanation:

Besides surface area and rock composition, the climate is the third main factor in determining how rock is affected by weathering. Therefore, option (C) is correct.

Weathering can be described as the deterioration of rocks, soils, and minerals through contact with water, gases, and biological organisms. Weathering takes place in situ and is distinct from erosion, which includes the transport of rocks and minerals by agents such as snow, water, ice, wind, waves, and gravity.

Weathering is divided into physical weathering and chemical weathering. Physical weathering includes the breakdown of rocks and soils through the mechanical effects of ice, heat, water, or other agents.

Chemical weathering includes the chemical reaction of water, gases, and biologically formed chemicals with rocks and soils. The materials left after the rock breaks combine with organic matter to form soil.

Many landforms and landscapes on the surface of the earth are the results of weathering processes.

Learn more about weathering, here:

https://brainly.com/question/14426457

#SPJ2

Answer:

There are 0.00047212 wig in 3.0099 dumps.

Explanation:

In this problem, we need to convert 3.0099 dumps to wigs.

6375.23 dumps = 1 wig (given)

1 dump = (1/6375.23) wig

To convert 3.0099 dumps to wigs, multiply 3.0099 by (1/6375.23).

3.0099 dumps = [tex]\dfrac{1}{6375.23}\cdot3.0099[/tex]

= 0.00047 wig

Hence, there are 0.00047212 wig in 3.0099 dumps.

Answer:

14 amu

Explanation:

The atomic mass is equal to the sum of protons and neutrons. There are 6 protons and 8 neutrons. 6+8=14amu

Answer:

The answer is 158.033949. I assume you are converting between grams KMnO4 and mole.

Explanation:

Answer:

128 grams of oxygen, O₂, is required for the complete combustion of 36 grams of pentane, C₅H₁₂ under standard conditions.

Explanation:

The balanced reaction is:

C₅H₁₂ + 8 O₂ ⇒ 5 CO₂ + 6 H₂O

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:

Being the molar masses of the compounds:

then, by stoichiometry, the following quantities of mass participate in the reaction:

Then you can apply the following rule of three: if by stoichiometry 72 grams of pentane react with 256 grams of oxygen, then 36 grams of pentane with how much mass of oxygen does it react?

[tex]mass of oxygen=\frac{36 grams of pentane*256 grams of oxygen}{72 grams of pentane}[/tex]

mass of oxygen= 128 grams

128 grams of oxygen, O₂, is required for the complete combustion of 36 grams of pentane, C₅H₁₂ under standard conditions.

Answer:

128 grams of oxygen, O₂, is required for the complete combustion of 36 grams of pentane, C₅H₁₂ under standard conditions.

Explanation:

Did the work trust!

Answer:

too simple question i don't have book pen now otherwise solved it

Answer:

The central and most important part of an object, movement, or group, forming the basis for its activity and growth.

Explanation:

hope this helps!

Answer:

atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. definition for science.

Explanation:

important part of an object, movement, or group

Answer: C. The number of atoms of each element is the same on each side of the equation.

Explanation:

The Law of Conservation of Matter shows that it is not possible for matter to either be created nor for it to be destroyed so the number of atoms of each element on the reactant side of the equation must equal the number of atoms in each element on the product side of the equation.

This is why the following equation is incomplete:

H₂ + O₂ ⇒ H₂O

The oxygen atoms are not the same on either side.

Equation will therefor have to be balanced which will make it:

2H₂ + O₂ ⇒ 2H₂O

Notice now that atoms are the same on both sides.

Answer:

v = m/D

Explanation:

Density is defined as the mass per unit volume, or D = m/v. Solve for Density equation for the variable v:

With this we are making v Which represents volume the subject so;

[tex]d = \frac{m}{v} [/tex]

With this you multiply both sides by ;

[tex]v[/tex]

[tex]v(d) = ( \frac{m}{v})v[/tex]

And then the v will multiply the d making it

“vd” and the ‘v’ will cancel the v making it;

[tex]vd = m[/tex]

So then we divide both sides by d to make v the subject.

[tex] \frac{vd}{d} = \frac{m}{d} [/tex]

So the d cancels the d leaving;

[tex]v = \frac{m}{d} [/tex]