Write down the “Word chemical equation” for the following described chemical reaction. 1.When Harris dropped a lump of magnesium into a test tube of hydrochloric acid, the chemical magnesium chloride was formed. Harris also noticed a gas being formed. The gas formed was Hydrogen.

Answer:

Sr(OH)₂ will be the limiting reagent.

Explanation:

First of all, you should know the following balanced chemical equation:

2 H₂CO₃ + 2 Sr(OH)₂ → 4 H₂O + Sr₂(CO₃)₂

The balanced equation is based on the Law of Conservation of Mass, which says that matter cannot be created or destroyed. Therefore, the number of each type of atom on each side of a chemical equation must be the same.      

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

Now, you know the following masses of the elements:

So the molar mass of strontium hydroxide is:

Sr(OH)₂= 87.62 g/mole + 2*(16 g/mole + 1 g/mole)= 121.62 g/mole

You apply the following rule of three, if 121.62 grams of hydroxide are present in 1 mole, 12.5 grams in how many moles are they?

[tex]moles of strontium hydroxide=\frac{12.5 grams*1 mole}{121.62 grams}[/tex]

moles of hydroxide= 0.103 moles

On the other hand, you have 150 ml of 3.5 M carbonic acid. Since molarity is the concentration of a solution expressed in the number of moles dissolved per liter of solution, you can apply the following rule of three: if in 1 L there are 3.5 moles of carbonic acid, in 0.150 L (being 1 L = 1000 mL, 0.150 L = 150 mL) how many moles of acid are there?

[tex]molesofcarbonicacid=\frac{0.150 L*3.5 moles}{1 L}[/tex]

moles of carbonic acid= 0.525 moles

Finally, to calculate the limiting reagent, you can use a simple rule of three as follows: if by stoichiometry 2 mole of strontium hydroxide reacts with , how much moles of carbonic acid will be needed if 0.103 moles of strontium hydroxide react?

[tex]molesofcarbonicacid=\frac{0.103 moles of strontium hydroxide*2 moles of carbonic acid}{2 moles of strontium hydroxide}[/tex]

moles of carbonic acid= 0.103 moles

But 0.525 moles are available. Since more moles are available than you need to react with 0.103 moles of strontium hydroxide, Sr(OH)₂ will be the limiting reagent.

Statement of Dalton's theory which is no longer used today is that matter is composed of small tiny particles called atoms as there are sub-atomic particles which are discovered.

Matter is a substance which is made up of various types of particles  which occupy space and have inertia . All living things and objects  are made up of various types of particles  that occupy space and have inertia .

Depending on temperature and other factors matter is able to exist in different phases. Most common of which are solid, liquid and gas. Matter can exist in more than one state depending on the temperature  and pressure .

State of matter can be changed  by heating or cooling and even by changing the applied pressure.When a state changes matter does not break rather its state changes though its chemical composition remains same.

Physical characteristics of matter are shape, color, size and temperature. Every matter is made up of elements which  cannot be broken down further by ordinary chemical reactions.

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Answer:

Combined with Hydrogen

Explanation:

This might help you with your question.

This is a person who scientific researches to make more knowledge in a certain area of interest

Answer:

a) The temperature of the water will rise by maximum 100 K, steam by 143.9 K

b) The temperature of the water will rise by maximum 100 K, steam by 1077.45 K

c) The temperature of the water will rise by maximum 100 K, steam by 972.75 K

d) The temperature of the water will rise by maximum 100 K, steam by 1027.86 K

e) The temperature of the water will rise by maximum 100 K, steam by 902.6 K

Explanation:

a) ΔH for ethanol = 29.65 kJ/g therefore, burning 100 g will produce;

29.65 × 100 = 2965 kJ

The specific heat capacity of water = 4.184 J/(g·K)

Therefore, 2965000= 1000 × 4.184 × ΔT

ΔT = 2965000 ÷ (1000 × 4.184) = 708.65 K

Latent heat of water = 2260 kJ/kg will be absorbed when the temperature reaches the boiling point of water hence we have

2965 - 2260 = 705 kJ to heat the water of which a maximum of 418.4 will boil the water and the steam temperature will rise by (705-418.4)/1.996 = 143.59 K

b) For Hexane: ΔH = 48.29 kJ/g

100 g will produce 4829 kJ

∴ Temperature change for the 1 kg water is given as follows

ΔT = 4829000 ÷ (1000 × 4.184) = 1154.16 K

However

4829 - 2260 = 2569

2569 - 418.4 = 2150.6

2150.6 / 1.996 = 1077.45 K

The final steam temperature will rise by 1077.45 K

c) For Kerosene(C₁₂H₂₆): ΔH = 46.2 kJ/g

100 g will produce 4620 kJ

∴ Hypothetically the temperature change for the 1 kg water is given as follows

ΔT = 4620000 ÷ (1000 × 4.184) = 1104.21 K

However

4620 - 2260 = 2360

2360 - 418.4 = 1941.6

1941.6 / 1.996 = 972.75 K

The final steam temperature will rise by 972.75 K

d) For Car Fuel(90% octane): ΔH = 47.3 kJ/g

100 g will produce 4730 kJ

∴ Temperature change for the 1 kg water is given as follows

ΔT = 4730000 ÷ 4184 = 1130.5 K

However

4730 - 2260 = 2470

2470 - 418.4 = 2051.6

2051.6 / 1.996 = 1027.86 K

The final steam temperature will rise by 1027.86 K

e) For Diesel (C₁₂H₂₃): ΔH = 44.8 kJ/g

100 g will produce 4480 kJ

∴ Temperature change for the 1 kg water is given as follows

ΔT = 4480000 ÷ 4184 = 1070.75 K.

However

4480 - 2260 = 2220

2220 - 418.4 = 1801.6

1801.6 / 1.996 = 902.6 K

The final steam temperature will rise by 902.6 K.

Answer:

people as: it Is less expensive. easy to carry

Answer:

On the left side of calcium atom.

Explanation:

There are two dots are present on the left side of calcium atom which represents the unpaired electrons present in the outermost shell. This structure is presented by Lewis in order to show the number of unpaired electrons in the atom. if the calcium atom loses these two electron during a chemical reaction so the two dots disappear and the calcium atom is now stable.

Answer:

the electrons in the fourth shell

Explanation:

the Lewis electron dot diagram represents the valence electrons, in the case of calcium, the V.E. are in the fourth shell

Answer:

yes because I wouldn't do it

Answer:

Left.

Explanation:

A+B      -->      AB

reactants      product

Answer:

The chemical equation is;

Ca3(PO4)2 + 8C ———> Ca3P2 + 8CO

Explanation:

Here, we are interested in writing a chemical equation that is useful in the reduction of phosphorite.

We should understand that to be able to reduce phosphorite, there is need for a reducing agent.

Solid carbon can be used here.

The products formed are shown in the equation as follows;

Ca3(PO4)2 + 8C ———> Ca3P2 + 8CO

Answer:One carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms

Explanation:

Answer:

B

Explanation:

By using coulombs law meaning the amount of force between two stationary electrically charged particles

Answer:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The total ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and are represented as ions.

The net ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and do not show the spectator ions which are same in the reactants and the products.

a) zinc nitrate + calcium sulphide [tex]\rightarrow [/tex] zinc sulphide + calcium nitrate

balance equation : [tex]Zn(NO_3)_2(aq)+CaS(aq)\rightarrow ZnS(s)+Ca(NO_3)_2(aq)[/tex]

total ionic equation :

[tex]Zn^{2+}(aq)+2NO_3^-(aq)+Ca^{2+}(aq)+S^{2-}(aq)\rightarrow ZnS(s)+Ca^{2+}(aq)+2NO_3^-(aq)[/tex]

net ionic equation :

[tex]Zn^{2+}(aq)++S^{2-}(aq)\rightarrow ZnS(s)[/tex]

b) potassium + calcium chloride  [tex]\rightarrow [/tex] potassium chloride + calcium

balance equation : [tex]2K(s)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(s)[/tex]

total ionic equation :

[tex]2K(s)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca[/tex]

net ionic equation: [tex]2K(s)+Ca^{2+}(aq)+\rightarrow 2K^+(aq)++Ca[/tex]

Answer:

gold

Explanation:

Answer:

The equation is an example of combination/synthesis.

Explanation:

A + B → AB

The definition of synthesis is the act of simpler compounds being combined together to make a more complex compound. Both A and B are being combined to each other to make AB. So, the given equation shows a synthesis reaction.

Answer:

Active Transport

Explanation:

As the name suggests, in active transport you need energy to move materials in and out. Similar to how if you want to be active you need energy, same goes with movements in our cells as well.

Answer:

LPG -Liquefied Petroleum Gas. CNG-Compressed Natural Gas.

May this help you

Hey!!!

LPG=Liquified Petroleum Gas

Or,

Liquid petrol Gas

CNG=Compressed Natural Gas

Hope it helps....

Good luck on your assignment

Answer:

Final pressure = [tex]4.31atm[/tex]

Explanation:

According to Gay-Lussac's law the pressure of a given mass of gas varies directly with the absolute temperature of the gas, provided the volume is kept constant.

SEE THE ATTACHMENT BELOW FOR STEP BY STEP EXPLANATION

Answer:

The percentage yield is 80.36% (see calculations in attachment).

Explanation:

The theoretical  yield of the reaction is the amount of product that would result if all the  limiting reagent reacted. The theoretical yield is calculated using the balanced equation.

In practice, the actual yield, or the amount of  product actually obtained from a reaction, is almost always less than the theoretical  yield.

To determine how efficient this reaction is, we need to calculate the percent  yield, which describes the proportion of the actual yield to the theoretical yield. It is  calculated as follows:

[tex] %yield = actual yield ÷ theoretical yield × 100% [/tex]

First we need to make sure that the equation is properly balanced. In the question they provide the balanced equation.

Since water is in excess, we calculate the theoretical yield using PCl₃.

Answer: yes that is true

Explanation:

newtons first law does state that.

Answer:

1. An overall net force must be applied to an object before it can move.

2. Newton’s first law of motion is also known as the law of inertia.

3. Newton’s first law applies to an object whether it is moving or not.

Explanation:

Edge

Answer:

Liquids, because they flow, can occupy whatever shape their container has, so they do not have a fixed shape. Because the particles in liquids are very close together (barely further apart than in solids) liquids do not easily compress, so their volume is fixed. hope that helps love!

Answer:

H₂O + Na → NaOH + H₂

Explanation:

Firstly, a skeleton equation does not reflect the relative amount of reactants and products. A skeleton reaction only identifies the reactant and product by their chemical formula but it does not quantify them. A skeleton chemical equation is simply described as an unbalanced equation.

The question asked for the correct skeleton reaction of water and sodium to produce sodium hydroxide and hydrogen.

Let us represent them with their chemical formula

Water → H₂O

Sodium → Na

Sodium hydroxide → NaOH

Hydrogen → H₂

The skeleton reaction will be  

H₂O + Na → NaOH + H₂

Answer:

Heat of fusion

Explanation:

Answer:

58.33 g/mol

Explanation:

Answer:

D) Cyanidin indicator

Explanation:

Cyanidin indicator has to be used in order to get an emerald green color at a pH of 9.

Indicators are substances that change colour when they are added to acidic or alkaline solutions.

In nature, cyanidin is a reddish-purple (magenta) pigment. It is the major pigment in berries [4] and other red-coloured vegetables such as red sweet potato and purple corn. It appears as a blue-reddish or purple pigment in the plant.

Cyanidin indicator has to be used in order to get an emerald green colour at a pH of 9.

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Answer: .5m

Explanation:

Answer:

The concentration of the potassium ions in ppm is 137.5 ppm

Explanation:

Here, we are interested in calculating the concentration of the potassium ions in ppm.

Mathematically, the term ppm which is read as parts per million is = mg of solute/liter of solution

We already have the mg of solute as 55mg

all we need now is the liters of solution

But what we have is 400 ml which is read as 400 milliliters

Mathematically, 1000 ml = 1l

Thus 400 ml = 400/1000 L = 0.4 L

Now the ppm = 55mg/0.4L = 137.5 mg/L or simply 137.5 ppm

Answer:

The container will have a pressure of 8 atm when the temperature is 50 degrees Celsius

Explanation:

To calculate this temperature, we need a gas law that relates temperature and pressure.

This is the Gay Lussac’s law and we know from it that temperature and pressure are directly related

Thus;

P1/T1 = P2/T2

From the question;

P1 = 4 atm

T1 = 25 degrees celsius

P2 = 8 atm

T2 = ?

Substituting these values, we have;

4/25 = 8/T2

4T2 = 8 * 25

4T2 = 200

T2 = 200/4

T2 = 50 degrees Celsius

Answer:

0.816

Explanation:

1 mole of NaCN is

Na = 23

C  =  12

N =   14

Total = 49 grams / mole (just add 23 + 12 + 14)

moles when only 10 grams of NaCN are used.

moles = grams/molar mass

grams = 10

molar mass = 49

moles = 10  /  49

moles = 0.204 moles

Volume in Liters

250 mL = 250mL/1000 mL / Liter = 0.25 Liters

Molarity

M = m/V

M = 0.204/0.25 = 0.816