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3 years ago

Why are state symbols used in chemical equations?

Chemistry

1 answer:

Zolol [24]3 years ago

3 0

Answer:

Explanation:

The state symbols been referred to in the question are s,l,aq and g.

s stands for solid

l stands for liquid

aq stands for aqueous

g stands for gas

The major reason this symbols are used is to signify the state of the molecules involved in the reaction. This is because the state of a substance sometimes shows the type of a product that will be formed and some other times, a substance in a particular state might have a certain property (required for a reaction) and in some other state would not have the same property. Hence it helps in understanding a reaction better. The following example should assist in understanding better

ZnS04(aq) + Cu(s) → CuSO4(aq) + Zn(s)

The reaction above shows ZnSO4 to be aqueous in the reactant but ZnSO4 could also be solid, however, for this reaction to occur, the compound must be in it's aqueous form. This product been solid zinc also shows that the reaction is an electrolytic equation as zinc (Zn) has been displaced by copper (Cu) from the solution. This reaction will typically not proceed also if the ZnSO4 used is solid.

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Please help!!!!!!!!!!!!!!

Elden [556K]

Answer:

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Explanation:

4 0

3 years ago

What is the mass of 22.4L of H2 at stp

bazaltina [42]

Answer:

2.02 g H₂

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic Table
Using Dimensional Analysis
STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 K

Explanation:

Step 1: Define

22.4 L H₂ at STP

Step 2: Identify Conversions

STP - 22.4 L / mol

Molar Mass of H - 1.01 g/mol

Molar Mass of H₂ - 2(1.01) = 2.02 g/mol

Step 3: Convert

$22.4 \ L \ H_2(\frac{1 \ mol \ H_2}{22.4 \ L \ H_2} )(\frac{2.02 \ g \ H_2}{1 \ mol \ H_2} )$ = 2.02 g H₂

5 0

3 years ago

Is material that has a density of 0.2g/ml good for building a bridge or for making couch cushions

lisov135 [29]

D = 0.2 g / ml = 0.2 g / cm³
For example, density of steel is 7.85 g / cm³.
Density of pure water is 1.0 g/cm³. An object which has a density < 1.0 g/cm³ will float in water.
Answer: Material that has a density of 0.2 g/ml ( 0.2 g/cm³ ) is good for making couch cushions.

8 0

4 years ago

Read 2 more answers

Phosphoric acid (h3po4) is tribasic, with pka's of 2.14, 6.86, and 12.4. The charge of the ionic form that predominates at ph 3.

Annette [7]

Correct answer is $H_2PO_4^-$ .

Phosphoric acid is a polyprotic acid having 3 acidic hyrdogen therefore it will have 3 pka values.

The equations for the release of acidic hydrogen can be written as:

$\\H_3PO_4\rightleftharpoons H_2PO_4^-+H^+\text{ pka=2.14}\\H_2PO_4^-\rightleftharpoons HPO_4^2^-+H^+\text{ pka=6.86}\\HPO_4^2^-\rightleftharpoons PO_4^3^-+H^+\text{ pka=12.4}$

From the pka values we can judge the idea of pH as using Henderson-Hasselbalch Equation, we get the relation between pH and pka.

$HA\rightarrow H^-+A^-$

Using the following equation, relation of pH and pka is

$pH=pka+log\frac{[A^-]}{HA}$

Using this equation, we can find that the equation having pka= 2. 14 is closest to the pH=3.2 so the ionic form in this equation will be dominant at the same pH.

Therefore at pH=3.2 the ionic form $H_2PO_4^-$ of $H_3PO_4$ is dominant.

7 0

3 years ago

Read 2 more answers

Convert 1.39 x 10^24 atoms of carbon to moles of carbon

Nimfa-mama [501]

If 1mol ------- is ----------- 6,02×10²³
so x ------- is ----------- 1,39×10²⁴

$x=\frac{1,39*10^{24}*1mol}{6,02*10^{23}}\approx2,31mol$

8 0

3 years ago

Read 2 more answers