A light-year is a way to measure ______ in space.
O time
Odistance
PLS HELPPPPPPPPPPPPPPPPPPPPPPPPPLLLLLPL

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:

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: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:

salt i know the answer and even sugar is

Answer:

The experiment shows that oil is less dense than water

Explanation:

If an object is less dense than water, it will float when placed in water, if an object is denser than water it will sink when placed in water.

The experiment shows that oil is less dense than water and so, the oil and water separate, with the oil floating on top of the water as a student puts some cooking oil and some water in a boiling tube and shakes it.

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:

Atomic Nucleus

Explanation:

Atomic Nucleus

Answer:

it is positive

Explanation:

due to that is how it is

Answer:

The nucleus is a positively charged region at the centre of an atom . The particles are protons , which have a positive electric charge , an neutrons, which are neutral in electric charge.

An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons . The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral . The nucleus of an atom contains protons and electron .

Answer:

D

Explanation:

Cuz i got it wrong and this was the right answer : )

The best reaction  that would possibly make a good  airbag inflator is the reaction in which CO2 is produced.

An airbag refers to certain objects that are put into vehicles to ensure that the occupants of the vehicle do not bump against objects that are within or outside the vehicle when there is a collision.

Since a good airbag must contain substances that quickly react to produce a non-combustible gas that fills up the airbag in order to cushion the effect of a collision, the best reaction that would possibly make a good  airbag inflator is the reaction in which CO2 is produced.

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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                        

The mass of lithium hydride that participates in the chemical reaction is 6.35 grams.

The mass of a substance can be calculated by multiplying the number of moles by its molar mass as follows:

mass (g) = no of moles (mol) × molar mass (g/mol)

According to this question, the chemical formula for lithium hydride is LiH. A chemist determined by measurements that 0.0800 moles of lithium hydride participate in a chemical reaction.

Molar mass of LiH = 6.941 + 1 = 7.94g/mol

mass = 0.8mol × 7.94g/mol = 6.35grams

Therefore, 6.35g is the mass of the lithium hydride.

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Answer: Registered. My 65 pound dog and my 20 pound dog share an 18 pound bag of 4Health and it lasts them 3 and 1/2 weeks.

Explanation:

Answer:

Well it depends how much the bag weighs in LB and your strength.

Explanation:

Answer:

Oxygen and Carbon Dioxide

Explanation:

Study Island

Answer:

7.129

Explanation:

1.239+2.36.6.7800

Answer:

800 ml

marbel

flow

Explanation:

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:

I'm not totally sure but I think that it is C-carbon

Explanation:

because its in the area of +1+2+3 4 -3 -2 -1

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:

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."

hope this helped:)

brainliest?

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:

The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s.

Answer:

calcium chloride deihydrate

Answer:

100.5 J

Explanation:

Answer:

(D)=1.16g

Explanation:

Answer:

D) 1.16 g

I'm not sure about answer ..

The answer is B) Group 8 .

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:

Flash Flood

Explanation:

On July 31, 1976, during the celebration of Colorado's centennial, the Big Thompson Canyon was the site of a devastating flash flood that swept down the steep and narrow canyon, claiming the lives of 143 people, 5 of whom were never found.

Answer:

because u need one more assianment before it becomes 100

Explanation: