Please help. I’m really struggling. No wrong answers please, if you don’t know it please don’t answer, I’m already failing the class.

Explanation:

Picture A which shows an overall negative charge represents an anion. Anion are formed when an atom gains an electron. In doing that, the total number of electrons (negative charge) is greater than the number of protons (positive charge), hence it would have an overall negative charge.

Picture B which shows a neutral charge represents a neutral atom. In an atom, the number of electrons equals the number of protons.

Picture C which shows an overall positive charge represents a cation. Cation are formed when an atom loses an electron. In doing that, the total number of electrons (negative charge) is less than the number of protons (positive charge), hence it would have an overall positive charge.

The temperature : 154.73 K

Given

mass = m = 5 g of Cl2

P = 900 mmHg = 1,18421 atm

V = 0.75 L

Required

Temperature

Solution

mol Cl2 = mass : MW = 5 : 71 = 0.07

Ideal gas law : PV = nRT

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.082 L.atm / mol K  

T = temperature, Kelvin  

T = PV/nR

Input the value :

T = 1.18421 x 0.75 / 0.07 x 0.082

T = 154.73 K

Answer:

crumpling of a piece of paper

Explanation:

chemical change cannot be reversed or gootten back

Answer:

Baking brownies!

Explanation:

The mixture of the ingredients undergoes a chemical change when it's heated and the substance changes very much so, melting a candle may seem like a similar change, but the wax is the exact same when it cools back down

Answer: It’s C

Explanation:

Answer:

B: Helium is 0.316x faster

If equal amounts of helium and argon are placed in a porous container and allowed to escape, helium will diffuse 3.16x faster than argon.

According to Graham's law of diffusion of gases, the rate of diffusion of a gas is inversely related to the square root of its molecular weight.

Mathematically, when two gases are being compared;

            r1/r2 = √m2/√m1

Where r1 = diffusion rate of gas 1, r2 = difussion rate of gas 2, m1 = molar weight of gas 1, and m2 = molar weight of gas 2.

Molar weight of helium = 4

Molar weight of argon = 39.9

Hence,

              r helium/r argon = √39.9/√4

                                      = 6.317/2

                                        = 3.16

Therefore, 3.16 x r argon = r helium.

In other words, helium will diffuse 3.16x faster than argon.

More on diffusion rate of gases can be found here: https://brainly.com/question/2967915

Answer: Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb. Your saliva has digestive enzymes in it

Explanation:

Answer:

See explanation

Explanation:

A reaction in which heat and light are produced is a combustion reaction. Combustion is said to have occurred when a substance is burnt in oxygen.

The balanced equation of the reaction is;

4Li(s) + O2(g) ------->2Li2O(s)

This reaction is exothermic because heat was produced. The reaction has a low activation energy as the metal easily burst into flames in oxygen. A catalyst is not needed in this reaction because it has a low activation energy.

According to the law of conservation of mass. Atoms are neither created nor destroyed in a chemical reaction. What this means is that in a chemical reaction, the number of atoms of each element on the left hand side must be the same as the same as the number of atoms of the same element on the right hand side.

Answer:

C. Involves a metal and a nonmetal.

Explanation:

Ionic compound involves a metal and a non-metal. Ionic compounds have electrovalent bonds between them.

These compounds are usually made up of metals and non - metals combining to form a unit.

Answer:

electrical power. nnnnnnn

Answer:

1.57 x 10⁷m

Explanation:

Given quantity is;

          1.57 x 10¹⁴nm

Now;

            1 nm  = 10⁻⁹

So, let us convert this given quantity;

         1 nm          =             10⁻⁹

  1.57 x 10¹⁴nm  will give 1.57 x 10¹⁴ x 10⁻⁹  = 1.57 x 10⁷m

Answer:

²⁰²Hg₈₀ ----> ²⁰²Tl₈₁ + ⁰₋₁e

Explanation:

The radioactive decay of the atom of an element by the emission of a beta-particle is equivalent to the splitting of a neutron in the nucleus of the radioactive element into an electron and a proton. The proton is retained by the nucleus whereas the electron is emitted as a beta-particle. This retention of the proton results in an increase of the atomic number by 1. A beta-particle is an electron. The electron is a very light particle and its loss makes no significant change in the mass number of the atom involved.

The beta decay of Hg-202 results in an increase of the atomic number from 8-0 to 81. Hence, Hg-202 is transformed to Tl-202. the balanced nuclear equation is given below:

²⁰²Hg₈₀ ----> ²⁰²Tl₈₁ + ⁰₋₁e

Answer: C - The iron becomes harder and stronger

Explanation:

The pure iron when mixed with the carbon then steel is formed which is the interstitial alloy of iron. About 0.002%- 2.1% (m/m) of carbon. The carbon atoms being smaller than the iron atom occupy the interstitial spaces or interstices in between the iron atoms. Thus these carbon atoms introduce imperfections in the iron crystal layer. The iron crystal layers become harder and they slide past one another and the iron becomes harder.

Answer:

Nonmetals and Nonmetals

Explanation:

Covalent bonding is when atoms share valence electrons. Nonmetals typically have 4, so two atoms can bond to have the total of 8.

Covalent bonds are most likely to form between atoms of this type of chemical elements: D. non-metals and non-metals.

A covalent bond can be defined as a bond that exists in chemical compounds and it typically involves the sharing of electrons between the atoms of a non-metallic chemical element.

In Chemistry, there are two (2) main types of covalent bond and these include:

Generally, a covalent bond is a type of bond that is commonly formed between two (2) non-metals while an ionic bond is usually formed between metals and non-metals.

Read more on covalent bond here: https://brainly.com/question/10429880

Answer:

k

p

p

k

k

I believe.. ............

Answer:

I have no clue sorry

Explanation:

good luck

Water and carbon dioxide are byproducts. Notice that photosynthesis and respiration are essentially the opposite of one another. Photosynthesis removes CO2 from the atmosphere and replaces it with O2. Respiration takes O2 from the atmosphere and replaces it with CO2.

Answer:

It is most of the time cheaper and more fresh than regular store bought food.

Explanation:

Answer:

C. It increases to 4 times its original magnitude.

Explanation:

If the distance between two objects is cut in half, the gravitational force between them is increased by 4 times the original magnitude.

From Newton's law of universal gravitation, the gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional the the square of their masses.

lt the original distance  = 4

Fg  = [tex]\frac{x }{4^{2} }[/tex]

New distance  = 3

  Fg = [tex]\frac{x}{2^{2} }[/tex]  

So;

          [tex]\frac{x}{2^{2} }[/tex]  /    [tex]\frac{x }{4^{2} }[/tex]  = 4

Answer:

30.06904

Explanation:

C3H4: Mass % C = 36.033 x 100 / 40.0641 = 89

Answer: the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. At the lowest energy level, the one closest to the atomic center, there is a single 1s orbital that can hold 2 electrons

Explanation:

Answer: the answer is think it yourself

Explanation:

Answer:

4Fe  +  3O₂   →   2Fe₂O₃

Explanation:

The chemical reaction is given as:

          Fe  +  O₂   →   Fe₂O₃

To balance an equation implies that the number of atoms and moles must be conserved.

  using the coefficients a,b and c, let use a mathematical approach to balance the expression;

           aFe  +  bO₂   →   cFe₂O₃

Conserving Fe: a  = 2c

                     O: 2b  = 3c

let c  = 1, a  = 2 , b  = [tex]\frac{3}{2}[/tex]  

  multiply through by 2 ;

         a  = 4, b  = 3 and c = 2

                  4Fe  +  3O₂   →   2Fe₂O₃

Answer:

Molarity = 0.002 M

Explanation:

Given data:

Mass of calcium chloride = 0.321 g

Volume of water = 1.45 L

Molarity of solution = ?

Solution:

Molarity = number of moles / volume in litter.

We will calculate the number of moles of calcium chloride first.

Number of moles = mass/molar mass

Number of moles = 0.321 g/ 110.98 g/mol

Number of moles = 0.003 mol

Molarity:

Molarity = 0.003 mol / 1.45 L

Molarity = 0.002 M

Answer:

Explanation:

Love the pfp

Answer:

Oxygen and positive charge.

Explanation:

The value of electronegativities of oxygen is higher than hydrogen due to which a slight negative charge occur on its oxygen atom and a slight positive charge on its hydrogen atoms of water molecule. The water is polar in nature because oxygen attract the shared pair of electron that leads to partial negative charge on oxygen while on the other hand, the hydrogen atom has acquire partial positive charge.