Select the correct answer from each drop-down menu.
An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons, the net charge on the atom will be_____. If the atom gains 4 electrons, the net charge will be_____.

Answer:c

Explanation:

As the combined mass of the HCl and NaOH is 15 grams before the reaction. Therefore the mass after the reaction will be 15 grams according to the law of conservation of mass. Therefore, option (C) is correct.

Matter can be transformed form via physical changes and chemical changes from one form to another form, during any of these changes, the total mass is conserved. The same quantity of matter exists before and after the chemical or physical as none of the matter is created or destroyed.

The balanced equation between the reaction of HCl and NaOH:

[tex]HCl +NaOH \longrightarrow H_2O +NaCl[/tex]

According to the law of conservation of mass, the mass of HCl and NaOH will be equal to the mass of the products water and NaCl.

As mentioned in the question the combined mass of HCl and NaOH measured before the reaction is 15 grams. Therefore, the mass of the products in the closed container will be equal to 15 grams as well.

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Your question was incomplete,  most probably the complete question was,

Fernando places 15 ml of HCl and 50 ml of NaOH in 100 ml of a beaker. He places them on a scale together and measures the combined mass of 15 grams.

After the HCl and NaOH react, Fernando measures the mass again. Using the mass before the reaction, what is the mass after the reaction? Remember, It is in a closed system.

A. 5.00 grams

B. 10.00 grams

C. 15.00 grams

D. 20.00 grams

Answer:

16 mol

Explanation:

                                 3Cl2 (g) + 8NH3 (g) → N2 (g) + 6NH4Cl (s)    

from reaction                             8 mol                        6 mol

given                                           x mol                       12 mol

8 : x = 6 :12

6x = 12*8

x = 12*8/6 =16 mol                        

Answer:B

Explanation:

The summary which expresses the main points of the Gravitational force best is the second one.

Gravitational force is a attraction force which is present between two objects and represented as:

F = gm₁m₂ / r², where

g = gravitational constant

m₁ = mass of one object

m₂ = mass of another object

r = distance between two objects

Because of gravity all objects will have a accurate position and particular order.

Hence second paragraph expresses best.

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Answer:

800 ml

marbel

flow

Explanation:

Answer:

(D)=1.16g

Explanation:

Answer:

D) 1.16 g

I'm not sure about answer ..

The answer is B) Group 8 .

d) 0.

5 out of 8 would be paired already because it has 5 electrons, then the other 3 would be filled by the 3 hydrogens.

Answer:

The  electronegativity   of fluorine  compare  to the  electronegativity   of oxygen and chlorine as below

Explanation:

Fluorine  has the highest electronegativity than oxygen, and  chlorine.

 Explanation

Generally  the  electronegativity  increase   across the period ( from the left to the right)  and  decreases down  the group.

Both oxygen and fluorine  are in period 2   in  periodic   table. since  fluorine is on  fur  right side as compared to oxygen , fluorine has higher  electronegativity than  oxygen.

On the  other side  Fluorine  and  chlorine are  in the same group in periodic table. fluorine  is at  the top of  the group  while chlorine  is at  the bottom therefore fluorine has  higher electronegativity  than chlorine.

Answer:

15 mol.

Explanation:

trust

Mole measure the number of elementary entities of a given substance that are present in a given sample. Thereofre,  the number of moles of each element in 1.25 mol C6H12O6. 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen.  

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole =given mass ÷ molar mass

1.25 mol C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex], contains 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen. So, total sum of mol of each element is equal to 4.5 mol.

Therefore,  the number of moles of each element in 1.25 mol C6H12O6. 1.25 mol of carbon, 1.25 mol of hydrogen and 1.25 mol of oxygen.  

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Answer:

N203 is a chemical compound some chemical names for N203 are Nitrogen trioxide. It is aka Dinitrogen trioxide, or nitrogen sesquioxide.

Explanation:

I searched it up

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Answer:

Potential energy is stored energy. An object has a measurable amount of potential energy depending on where it’s located and how it relates to other objects around it — the energy of position.[1]  

An apple on the floor has very little potential energy. Lift it to the top of a skyscraper, and suddenly it has a lot of potential energy. It can fall to the ground under the force of gravity. It can also interact with other objects on its descent, such as striking a flying bird or landing on a car roof and damaging it.  

When the apple is descending, its potential energy has become kinetic energy, which is the energy of motion. Kinetic energy is the energy a person or an object has due to its motion — in this example, the falling apple. A parked bike on top of a hill has potential energy, which becomes kinetic energy once you start riding it downhill.  

Both of these energies are measured in joules. Energy is never destroyed or lost when changing from potential energy to kinetic energy — it is merely transformed from one energy type to another. This is known as the law of conservation of energy.[2]  

The potential energy of an object cannot be transferred to another entity – you cannot suck the potential energy out of the apple atop a skyscraper. Kinetic energy is transferable, as witnessed with the falling apple’s kinetic energy damaging a car or hitting a bird.  

What Is the Relationship Between Potential and Kinetic Energy?  

Relationship Potential and Kinetic Energy explained | Waterfall energy image

The relationship between potential energy and kinetic energy is that potential energy can transform into kinetic energy.  

Potential energy is position relative. In other words, it changes depending on an object’s height or distance and the mass of the object. Kinetic energy changes depending on an object’s speed and its mass.  

If we think about a waterfall, some still water at the top of the waterfall has potential energy. It isn’t moving and hasn’t gone over the edge. The water flowing from the waterfall has kinetic energy as it flows.[3]  

A pendulum is an excellent example of this relationship. As the pendulum swings ever higher upwards, its potential energy increases until it reaches its optimum at the highest point of the swing. At the top of the arc, the potential energy turns into kinetic energy as it swings back down.[4]  

What Are Examples of Potential Energy?  

There are two primary types of potential energy: gravitational potential energy and elastic potential energy.  

The gravitational force of the Earth causes gravitational potential energy. When a person jumps from a high dive board, they land with much force (and a splash) into the swimming pool below.  

The Earth’s gravity uses the diver’s gravitational force (their weight) to produce the kinetic energy (movement) that brings the diver into the pool. At the top of the diving board, we can talk about the diver’s gravitational potential energy.  

This is the same for apples on trees, bikes on top of a hill, a roller coaster waiting to descend, and a skydiver in a plane — all examples of the potential to do an amount of work.[5]  

Elastic potential energy occurs when you stretch or compress something. A rubber band left on a sideboard has little potential energy. If you pick it up and stretch it, you have increased its potential to do some work.  

If you release the rubber band, it may fly across the room or scare the cat. You manipulated the rubber band to increase its potential energy, which was then released as kinetic energy as it traveled (motion) across the room. An archer pulling back a bow and coiling a spring are further examples of potential energy.[6]  

Explanation:

Average atomic mass of Chlorine = 35.45 amu

The percentage of isotopes is the percentage abundance.

This is given by;

Average atomic mass = (Mass of isotope * Percentage abundance of 35/17 Cl) + (Mass of isotope * Percentage abundance 37/17 Cl)

Let percentage abundance of 35/17 Cl = x

Then percentage abundance of 37/17 Cl = 1 - x

Putting the values in the equation;

35.45 = (35 * x)   + (37 * (1-x))

35.45 = 35x + 37 - 37x

35.45 - 37 = 35x - 37x

- 1.55 = -2x

x = 1.55 / 2 = 0.775

Percentage abundance of 35/17 Cl = 0.775 * 100 = 77.5%

Percentage abundance of 37/17 Cl = (1 - 0.775) * 100 = 22.5%

Answer:

calcium chloride deihydrate

Answer:

11.76% by weight in salt

Explanation:

concentration = mass of solute / mass of solute + mass of solvent

mass of solute = 20 grams

mass of solvent = 150 grams

mass of solute + mass of solvent = 20g + 150g = 170g

concentration (weight %) =  (20g / 170g)100% = 11.76% by weight in salt.

Answer:

99.8%

Explanation:

Answer: 99.8%

Explanation:

Sun Facts. The Sun is the largest object within our solar system, comprising 99.8% of the system's mass. The Sun is located at the center of our solar system, and Earth orbits 93 million miles away from it. Also the sun is the hottest star in the ENTIRE galaxy :)

Answer:

1, 1, 2

Explanation:

You need to have the same amount of atoms of everything element on both the products and reactants side

Reactants:

Na=2

O=2

H=2

Products:

Na=2

O=2

H=2

Answer:

salt i know the answer and even sugar is

Answer:

v = 16 m/s

Explanation:

Given that,

Distance, d = 400 m

Time taken, t = 25 s

We need to find the speed of the horse. Speed is equal to distance covered divided by time taken. So,

[tex]v=\dfrac{d}{t}\\\\v=\dfrac{400\ m}{25\ s}\\\\v=16\ m/s[/tex]

So, the speed of the horse is 16 m/s.

Answer:

The nucleus consists of 4 protons (red) and 5 neutrons (orange). Four electrons (white) occupy available electron shells (rings). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Subatomic particles are particles that are smaller than the atom. Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P."

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A beryllium atom has atomic number 4 where its nucleus has 4 protons  and 5 neutrons  and 4 electrons revolving around the nucleus in in the shells.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include the elements iron, nickel, and cobalt, and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone.

Gravitational force is is a force that attracts two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. Every object, including you, is pulling on every other object in the entire universe!

An example of gravitational force in the real world is the force that holds the gases in the sun. The force that causes a ball you throw in the air to come down again. The force that keeps the Earth and all of the planets in line in the proper position in their orbits around the sun.

Answer:

Oxygen and Carbon Dioxide

Explanation:

Study Island

Answer:

SEE EXPLANATION

Explanation:

A)

1) The balanced  chemical reaction is;

Fe2O3 + 3H2O------> 2Fe(OH)3

2) C12H22O11------> 12 C + 11H2O

B)  1 is a combination reaction

     2 is a decomposition reaction

C) The molar mass of NH3 is 14 + 3(1) = 17 g/mol

Percentage composition of N = 14/17 * 100/1 = 82. 4 %

D) 1 mole of O2 contains 6.02 * 10^23 particles

E) For (NH4)3 PO4

We have 3(14 + 4(1)) + 31 + 4(16) = 149 g/mol

F) 1 mole of CaCO3 contains 100g of CaCO3

1.25 moles of CaCO3 contains 1.25 * 100/1 = 125 g of CaCO3

Answer:

Chlorine,Argon

Explanation:

All the elements of group 18 and group 17

The periodic table depicts the various elements arranged based on the increasing order of their atomic numbers. Argon and chlorine will have more valence electrons than sulfur.

A valence electron is an electron of an atom present in the outermost shell that participates in bond formation. The valence electrons are the same in elements placed in the same group or family.

The number of valence electrons increases in a horizontal row called the period of the periodic table. As when one moves from left to right in a period the valence electron increases.

The number of valence electrons in a sulfur atom is 6, whereas in chlorine is 7 and in argon is 8. As chlorine and argon are placed after sulfur in a period will have more valence electrons.

Therefore, argon and chlorine have more valence electron than sulfur.

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Answer:

distance and time are needed to find velocity