Directions: Fill in the 12 steps in the decay of U-235 in the diagram below.

Begin with U-235 and finish with an
isotope of lead. The particles emitted in each step are listed below. Use the periodic table to find information about
mass numbers, atomic numbers, and chemical symbols. Place the correct symbol in the space corresponding to the
correct mass number and atomic number.

A balanced chemical equation obeys the law of conservation of mass. In a balanced chemical equation the mass of the reactants and products are equal. The correct option is true.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called coefficients. They are found in front of formulas.

According to law of conservation of mass, mass can neither be created nor be destroyed. But it can be transformed from one form to another.

In a balanced chemical equation, the total mass of the reaction remains constant. The mass of the reactants before reaction is equal to the mass of products after reaction.

Thus the given statement is true.

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Answer:

B) increases

higher temperature = higher pressure

Answer:

Explanation:

The answer is D

Answer:

limiting reactant

Answer: B) limiting reagent

Answer:

Exposed surface area

Explanation:

The powdered calcium carbonate will react faster with hydrochloric acid than calcium carbonate chips due to the exposed surface area.

Powdered calcium carbonate has a larger surface area compared to the chips. And, the larger the surface area exposed on a body, the faster the reaction it will undergo.

For the same masses of a solid substance, the smaller the particle size of each form, the larger the surface area exposed to reaction.

The surface area exposed proportionally affects the rate of reaction.

Answer:

A

Explanation:

This is because of the law of conservation of mass.  This means that even if a reaction occurs, the mass will remain the same.

New atoms will not be formed, but new compounds will.

Answer:

You have to put equator in middle, trade winds on which ever side they are trading the items on, probaly north, and westerlies west, and jet streams around blue at the bottom, red at top and green in the middle.

Explanation:

I cant really explain it right because I don't know how to put the picture. I mean paste the picture on here

CAN YOU TELL ME HOW TO PUT PICTURE

Answer:

No

Explanation:

My sister uses this all the time and it is perfectly safe

Answer:

no

Explanation:

as long as you change it up a little and word it to look like your own

Answer:

1300 ppm

Explanation:

for ppm, calculate fractional ration =(part/total) and multiply by 1 x 10⁶ => ppm

for ppb, calculate fractional ration =(part/total) and multiply by 1 x 10⁹ => ppb

Parts Per Million (ppm)

Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3g/1000g)(10⁶) = 1300 ppm

Parts Per Billion (ppb)

or if ppb is needed do the same calculation but multiply by 10⁹ ... That is,

Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3/1000g)(10⁹) = 1300000 ppb = 1.3 x 10⁶ ppb

Parts per Hundred (pph) is the same as percent (%) ... Calculate fractional ratio and then multiply by 100%

Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3g/1000g)(100%) = 0.13%

[H₃O⁺] = 8.86 x 10³ M

The dissociation of water :

H₂O(l)⇒H⁺+OH⁻

Hydrogen ions H⁺ bond with H₂O to form H₃O⁺ ions(hydronium ion)

When acid(Hbr acid) is in the presence of water(dissociates), the H⁺ ions bond with water molecules to form hydronium, the reaction :

HBr(aq)+H₂O→H₃O+(aq)+Br−(aq

So Ionization of HBr :

[tex]\tt HBr\rightarrow H_3O^++Br^-[/tex]

[HBr]= 8.86 x 10³,

From equation ratio [H₃O⁺] : HBr = 1 : 1, so

[tex]\tt [H_3O^+]=8.86\times 10^3[/tex]

Answer is 2

4Fe + 3O2 –> 2Fe2O3

Heat would be required  : 1,670 J

Given

mass of H₂O=5 g

Required

Heat to melt

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Lf=latent heat of fusion

The heat of fusion for water at 0 °C : 334 J/g

Input given values in formula :

[tex]\tt Q=5\times 334=\boxed{\bold{1,670~J}}[/tex]

Answer:

in vinyl chloride there exist a partial  double bond between chlorine and carbon atoms.this partial double bond increases  the strength of bond between  carbon and chlorine.

Explanation:

Answer:

1-because of mesomerism in carbon-halogen bond result to formation of a degree of double bond

Explanation:

[ Methylene=CH_X ] [ (-)Methylene_CH=X(+) ]

2- their preparation from ethylene dihalide

Answer:

13 minutes

Explanation:

For the endothermic reaction to reach 0°C, it will take 13 minutes.

 Let us follow the process step by step;

 Rate of decrease is 2°C per minute.

  Start is 26°C

    Time                   temperature

     0 min                    26°C

      1 min                     24°C

      2 min                     22°C

     3 min                      20°C

    4 min                       18°C

   5 min                        16°C

     6 min                      14°C

     7 min                      12°C

     8 min                     10°C

    9 min                       8°C

     10 min                      6°C

     11 min                       4°C

     12 min                      2°C

      13 min                      0°C

Answer:

The appropriate alternative is "Option D".

Explanation:

All those other options aren't relevant to the situation in question. So the above alternative becomes the right one.

Answer:

It starts to move because of Newtons first law "An object will not change it's motion unless a force acts on it"

Explanation:

Meaning ball B is that force acting upon ball A

Answer:

D. The granularity of locks.

Explanation:

X-locks is one of the locks used in locking database in what is known as adaptive server. Other types of locks for locking database are the S-lock, IS-locks, and the IX- locks. The locks are used mainly for control purpose[ that is when a data is been used by a lot of people, the locks make sure that there is consistency in the data.  

The option D is correct that is; ''The moment that X-locks are released will determine the granularity of the locks'' The granularity of the locks simply means the amount in which the data can be locked at the same time.

Answer:

Explanation:

The answer is Option D, The Granularity of locks:

In computer science granularity locking is a locking method used in database management systems (DBMS) and relational databases, and granularity of locks in a database refers to how much of the data is locked at one time and it is determined when S locks are released which means Shared Locks.

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Answer:

417

Explanation:

50um is

50000nm

50000:120=417

Answer:

Answer is shown on the paper :D

Explanation:

Remember to follow sig-figs.

Answer:

C. Electrons flow from an outlet into a toaster, causing it to heat a

slice of bread.

Explanation:

Current produces a heating effect. Current may be used to produce a heating effect in appliances such as the electric pressing iron, toaster, oven etc.

When electrons flow from an outlet into a toaster and the current thus obtained heats a slice of bread, current is said to flow from the outlet into the toaster.

Let us remember that current refers to the flow of electrons in a circuit.

Answer:

CaCO₃

Explanation:

Calcium ion is written as Ca²⁺

Carbonate ion is written as CO₃²¯

During bonding, the +2 ions from the calcium and the –2 ions from the carbonate will cancel out given a net charge of zero as shown below:

Ca²⁺ + CO₃²¯ —> CaCO₃

Thus, the correct formula for the ionic compound that forms when oppositely charged ions of calcium and carbonate attract is CaCO₃.

Explanation:

Depositional landforms are the visible evidence of processes that have deposited sediments or rocks after they were transported by flowing ice or water, wind or gravity. Examples include beaches, deltas, glacial moraines, sand dunes and salt domes.

hope it helps!

Answer:

See detailed explanation.

Explanation:

Hello!

In this case, for the reaction:

[tex]I_2+H_2\rightleftharpoons 2HI[/tex]

It is known that the equilibrium constant tends to be greater than 1; therefore, it is a reaction that tends to go rightwards towards the formation of hydrogen iodide.

a) Here, since the reaction tends to form the product, it is clear that the initial concentration of iodine and hydrogen will decrease as the reaction reaches equilibrium in order to increase the concentration of hydrogen iodide.

b) Yes, it stops at the point in which the following expression:

[tex]\frac{[HI]^2}{[I_2][H_2]}[/tex]

Equals the equilibrium constant.

Best regards!

Answer:

D

Explanation:

Answer:

For me

Explanation:

it's carbon because it's part of our regular respiration

Answer:

I would guess that the MA of the screwdriver is 120N.

Explanation:

I think this because you are adding 30 and 90, since there are two forces being acted on the same place in the same direction.

#teamtrees #WAP (Water And Plant)

The volume = 309.04 ml

Given

Specific gravity=-1.28 and strength =24.7% by mass of H₂SO₄

mass 125g of ZnC0₃

Required

The volume of H₂SO₄ Solution

Solution

Reaction

ZnCO₃ + H₂SO₄ → ZnSO₄ + CO₂ + H₂O

mol of ZnCO₃(MW=125.4 g/mol) :

[tex]\tt mol=\dfrac{125}{125.4}=0.997[/tex]

From equation, mol ZnCO₃ : H₂SO₄= 1 : 1 so mol H₂SO₄=0.997

mass of H₂SO₄ (MW=98 g/mol) :

[tex]\tt mass=mol\times MW=0.997\times 98=97.706~g[/tex]

mass of solution :

[tex]\tt \dfrac{100}{24.7}\times 97.706=395.57~g[/tex]

Volume of solution :(density of solution=1.28 g/ml for the reference substance is water(density=1 g/ml)

[tex]\tt V=\dfrac{395.57}{1.28}=309.04~ml[/tex]

Answer:

What ever the other person said

Explanation:

Answer:

Phosphorus

Explanation:

Lewis Dot Structure is a structural representation of a molecule that shows valence electrons of a molecule.

The element in group 15, period 3 is Phosphorus (P). Phosphorus has an atomic number 15 and valence electrons are 5. So, the lewis structure will show 5 dots around P atom.

Answer:

hydrocarbons

Explanation:

hope this is right.. if not sorry:)