How are self heating coffee cans dangerous?

Answer:

Single replacement

Explanation:

Zn replaces the halogen (Cl) from HCl

It is a single replacement reaction

Answer:

BaCl2(aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq)

Explanation:

Chemical reactions are of different types namely; combination reaction, displacement reaction, double displacement reaction etc. Double displacement/replacement reaction is that reaction in which an exchange of ions occur between two reacting ionic compounds to form new products.

In this chemical reaction/equation;

BaCl2(aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq)

2Cl- and SO42- are the ions exchanged in this reaction. Barium (Ba) displaces SO42-, while Sodium (Na) displaces 2Cl-, hence it is called DOUBLE DISPLACEMENT OR REPLACEMENT because the displacement involves two compounds/ions.

Answer:

0.4318 mol

Explanation:

moles = mass/molar mass

moles = 9.50/22

Answer:

10.3125 grams of carbon dioxide will be formed.

Explanation:

The balanced reaction is:

C₃H₈ + 5 O₂→ 3 CO₂ + 4 H₂O

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

Being the molar mass of the compounds:

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

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: If by reaction stoichiometry 44 grams of propane react with 160 grams of oxygen, 7.2 grams of propane react with how much mass of oxygen?

[tex]mass of oxygen=\frac{7.2 grams of propane*160 grams of oxygen}{44 grams of propane}[/tex]

mass of oxygen= 26.18 grams

But 26.18 moles of O₂ are not available, 12.5 grams are available. Since you have less mass than you need to react with 7.2 grams of propane, oxygen O₂ will be the limiting reagent.

Then you can apply the following rule of three: if by stoichiometry of the reaction 160 grams of oxygen form 132 grams of carbon dioxide, 12.5 grams of oxygen will form how much mass of carbon dioxide?

[tex]mass of carbon dioxide=\frac{12.5 grams of oxygen*132 grams of carbon dioxide}{160 grams of oxygen}[/tex]

mass of carbon dioxide= 10.3125 grams

10.3125 grams of carbon dioxide will be formed.

Answer:

magnesium + oxygen = magnesium oxide

Explanation:

the word equation for molecules of magnesium reacting with molecules of oxygen to produce molecules of magnesium oxide is magnesium  oxygen  magnesium oxide.

Answer:

I would describe it as a amount of water that builds up and jumps up into the air and then splashes back down into the water like it was never there.

Explanation:

Answer:

16.6 g of Al are produced in the reaction of 82.4 g of AlCl₃

Explanation:

Let's see the decomposition reaction:

2AlCl₃ →  2Al  + 3Cl₂

2 moles of aluminum chloride decompose to 2 moles of solid Al and 3 moles of chlorine gas.

We determine the moles of salt:

82.4 g . 1mol/ 133.34g = 0.618 moles

Ratio is 2:2. 2 moles of salt, can produce 2 moles of Al

Then, 0.618 moles of salt must produce 0.618 moles of Al.

Let's convert the moles to mass → 0.618 mol . 26.98g /mol = 16.6 g

Answer:

7.20

Explanation:

Answer:

a) pH = 9.82     b) pH = 1.65

a) pOH = 7.8     b) pOH = 4.45

Explanation:

pOH + pH = 14 for all of these solutions.

pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

3.a)Given;

pOH = 4.18

To Find;

pH = ?

We know that

pH + pOH = 14

pH = 14 – pOH

pH = 14 – 4.18

pH = 9.82

Thus, The pH of the solution is 9.82

b)Given;

pOH = 2.35

To Find;

pH = ?

We know that

pH + pOH = 14

pH = 14 – 2.35

pH = 14 – 2.35

pH = 11.65

Thus, The pH of the solution is 11.65

4. a)

Given;

pH = 6.2

To Find;

pOH = ?

We know that

pH + pOH = 14

pOH = 14 – pH

pOH = 14 – 6.2

pOH = 7.8

Thus, The pOH of the solution is 7.8

4. b)

Given;

pH = 9.55

To Find;

pOH = ?

We know that

pH + pOH = 14

pOH = 14 – pH

pOH = 14 – 9.55

pOH = 4.45

Thus, The pOH of the solution is 4.45

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Answer:

Pangea

Explanation:

Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and began to break apart about 175 million years ago. Forming into what we have today :)

Answer:

Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water

(b) Zinc + Silver nitrate → Zinc nitrate + Silver

(c) Aluminium + Copper chloride → Aluminium chloride + Copper

(d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chlorid

Explanation:

Answer:

Choice 3 (Density is a physical property)

Explanation:

An object can be larger but not more dense than a smaller object. The density will stay the same if an object is split because density is mass divided by volume. If you divide the density the mass and volume get divided by the same amount, so it is the same. Gravity does not affect density

Explanation:

i have done

see the picture

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Answer:

hi

Explanation:

Answer: C planets dont travel in perfect circles and they do not orbit earth they orbit the sun and they ellipse around the sun. this is the correct answer do not lsiten to the other person

Explanation:

The statement which is correct about planetary orbits is the planets travel in ellipses around the sun.

Orbits is the path of the motion, in which planets do revolutionary motion in a particular sequence.

In the solar system, sun is present at the center and all the planets do revolution around the sun in their orbits which are ellipse in their shape. Elliptical shape of the orbits is due the large distance of planets from the sun which reduces the speed due to less gravitational force of sun on that object.

Hence, option (C) is correct i.e. The planets travel in ellipses around the sun.

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Answer:

6.5x10⁻³M = [OH⁻]

Explanation:

The Kb of a Weak base as ethylamine is expressed as follows:

Kb = [OH⁻] [C₂H₅NH₃⁺] / [C₂H₅NH₂]

As the equilibrium of ethylenamine is:

C₂H₅NH₂(aq) + H₂O(l) ⇄ C₂H₅NH₃⁺(aq) + OH(aq)

The concentration of C₂H₅NH₃⁺(aq) + OH(aq) is the same because both ions comes from the same equilibrium. Thus, we can write:

Kb = [OH⁻] [C₂H₅NH₃⁺] / [C₂H₅NH₂]

6.4x10⁻⁴ = [X] [X] / [C₂H₅NH₂]

Also, we can assume the concentration of ethylamine doesn't decrease. Replacing:

6.4x10⁻⁴ = [X] [X] / [0.066M]

4.224x10⁻⁵ = X²

6.5x10⁻³M = X

The molar concentration of OH ions in a 0.066 M solution of ethyl amine is [tex]6.5x10^-^3M[/tex]

Molar concentration is the measure of the concentration of the chemical species present in any solution.

Step1: Calculating The Kb

[tex]Kb = [OH^-]\dfrac{ [C_2H_5NH_3^+] }{[C_2H_5NH_2]}[/tex]

As the equilibrium of ethyl amine is:

[tex]\rm C_2H_5NH_2(aq) + H_2O(l) <-> C_2H_5NH_2^+(aq) + OH(aq)[/tex]

[tex]Kb = [OH^-]\dfrac{ [C_2H_5NH_3^+] }{[C_2H_5NH_2]}[/tex]

[tex]6.4\times10^-^4 = \dfrac{ [X][X]}{[C_2H_5NH_2]}[/tex]

The concentration of ethyl amine does not decrease.

[tex]\rm 6.4\times10^-^4 = \dfrac{ [X][X]}{0.066\;M}[/tex]

[tex]4.224\times10^-^5 = X^2[/tex]

[tex]6.5x10^-^3M = X\\\\6.5x10^-^3M = [OH^-][/tex]

Thus, the molar concentration is [tex]6.5x10^-^3M[/tex]

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Answer:

Draw the example below

Hope this helps

Hope it helps.

If you have any query, feel free to ask.

Answer:What is used up in and stops a chemical reaction? (a) percent yield (b) limiting reactant (c) theoretical yield (d) excess reactant

The correct option is (b)

Explanation:

A chemical reaction is a chemical combination,rearrangement or disintegration of chemical substance(s) (called reactants) to form new chemical substance(s) (called products).

A limiting reactant is the reactant that is totally used up during the course of a reaction. When this reactant is used up, it limits the amount of products formed and eventually stops the chemical reaction.

Explanation:

The limiting reagent is the reactant that is used up completely. This stops the reaction and no further products are made. ... This method is most useful when there are only two reactants. The limiting reagent can also be derived by comparing the amount of products that can be formed from each reactant.

hope this helps have a nice day❤️

Answer:

Explained below.

Explanation:

From avogadro's number, we know that;

1 mole = 6.022 × 10^(23) atoms, molecules, protons e.t.c.

Now,to convert from atoms, compounds, formula units, etc to moles, what we will do is just to divide the amount of the particle value given in the specific units by avogadro's number.

For example, to convert 23 × 10^(20) atoms to moles, we will have;

Number of moles = (23 × 10^(20))/(6.022 × 10^(23)) moles = 0.00382 moles

Answer:

C

Explanation:

cell theory states:

all living things are made of 1 or more cells

all cells come from pre-existing cells

the cell is the basic unit of structure

The second quantum number (l) describes which sublevel the electron is in

Answer:

Yes it is a colligative Property

Explanation:

There is freezing point depression, boiling point elevation, Osmotic Pressure, Vapor Pressure Lowering

Answer:

H2SO3(aq) + KOH(aq) ---> 2H2O(l) + K2SO3(aq)

Explanation: