The reaction, 4Fe (s) + 3O2 (g) à 2 Fe2O3 (s), is the rusting of iron. What occurs as the reaction proceeds? a precipitate is formed the color of the solid will change a new odor is given off the solution bubbles
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Answer: the color of the solid will change
Explanation:
A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Oxidation of iron to ferric oxide is a chemical change.
Here iron which is grey in color changes first to green and then turns brownish red.
Characteristics of a chemical reaction:
1. change in color
2. heat is gained or lost
3. evolution of gas
4. formation of precipitate
Related Questions
Every substance melts at 0 degrees Celsius and boils at 100 degrees Celsius.True False
2Al + 6HCl → 2AlCl3 + 3H2 If 3.0 grams of H2 were produced, how many grams of Al reacted? (Molar mass of Al = 27 g/mol, molar mass of H2 = 2.0 g/mol) ___ grams
The average atomic mass of oxygen is 15.9994 amu. The atomic masses of its three isotopes are as follows: O-16: 15.995 amu; O-17: 16.999 amu; O-18: 17.999 amu Which isotope is most likely to have the greatest abundance in nature?
What is the relationship between concentration and rate of reaction
False
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just because she is being paid by him does not mean anything unless the planner is cheating and or she has some reason to be inaccurate
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Answer:
Option B. Add 1.46 g of NaCl to 250 mL of H₂O
Explanation:
Analyse the data given: 250 mL and 0.10 M
The molar concentration and the volume of solution can indicate the moles of solute that were used.
Let's convert the volume from mL to L → 250 mL . 1 L /1000mL =0.250L
M . volume = moles → 0.10 mol/L . 0.250L = 0.025 moles
If we convert the moles to mass, we'll know the mass of solute:
0.025 mol . 58.4 g/mol = 1.46 g
Answer:
We have to solve 1.46 grams of NaCl in 250 mL H2O (option B)
Explanation:
Step 1: Data given
Volume = 250 mL = 0.250 L
Molarity NaCl solution = 0.10 M
Molar mass of NaCl = 58.4 g/mol
Step 2: Calculate moles NaCl
Moles NaCl = molarity * volume
Moles NaCl = 0.10 M * 0.250 L
Moles NaCl = 0.025 moles
Step 3: Calculate mass NaCl
Mass NaCl = moles NaCl * molar mass NaCl
Mass NaCl = 0.025 moles * 58.4 g/mol
Mass NaCl = 1.46 grams
We have to solve 1.46 grams of NaCl in 250 mL H2O (option B)
TrueFalse
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Answer:
False
Explanation:
it contains pepsin and hydrochloric acid
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Its chemical formula is : CH3COOH or HC2H3O2.
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The proper name for vinegar is vinegar.
It consists of roughly 15% acetic acid and 85% water, with a small amount of natural vegetable colorants and volatiles (hence the differences in colours and odours between brown vinegar, white vinegar, cider vinegar, balsamic vinegar, etc.)
The acid in vinegar is indeed acetic acid; however, 90 percent of all the acetic acid on the market is made in chemical plants. Almost all of that - 83 percent of the total - is made by reacting methanol and carbon monoxide in the formula
CH3OH + CO -> CH3COOH
The rest is made by oxidizing either acetaldehyde or ethylene.
Vinegar is always made by fermenting fruit juices. It is a two-stage process, in which yeasts convert fruit juice to wine, then acetobacter bacteria convert the alcohol in wine to acetic acid. Because many nations' food laws prohibit the use of vinegar in edibles that is not made through the fermentation of fruit juice, they are very careful to only call fruit juice-derived acetic acid "vinegar."
2NO2 (g) --> N2 (g) + 2O2 (g)
C5H12 (g) + 8O2 (g) --> 5CO2 (g) + 6H2O (g)
2NaClO3 (s) --> 2NaCl (s) + 3O2 (g)
2Na (s) + Cl2 (g) --> 2NaCl (s)
CH3OH (l) --> CH3OH (g)
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Answer:
(i) ΔS° < 0 or negative
(ii) ΔS° > 0 or positive
(iii) ΔS° > 0 or positive
(iv) ΔS° > 0 or positive
(v) ΔS° < 0 or negative
(vi) ΔS° > 0 or positive
Explanation:
Entropy is a state function and extensive property of the system.
It's the measurement of degree of randomness..
Entropy of the system decreases as follows
Gas > Liquid > Amorphous solid > Crystalline solid.
In case for chemical reaction
(i) Ba²⁺ (aq) + SO₄²⁻ (aq) --> BaSO₄ (s)
Total entropy change ΔS° < 0 or negative
During this reaction aqueous i.e liquid phase converted into solid phase.
So randomness decreases and hence entropy also decreases.
(ii) 2 NO₂ (g) --> N₂ (g) + 2 O₂ (g) ΔS° > 0 or positive
Since no. of gaseous moles increases from reactants to products.
(iii) C₅H₁₂ (g) + 8 O₂ (g) --> 5 CO₂ (g) + 6 H₂O (g) ΔS° > 0 or positive
Since no. of gaseous moles increases from reactants to products.
(iv) 2 NaClO₃ (s) --> 2 NaCl (s) + 3 O₂ (g) ΔS° > 0 or positive
Since no. of gaseous moles increases from reactants to products.
(v) 2 Na (s) + Cl₂ (g) --> 2 NaCl (s) ΔS° < 0 or negative
Since no. of gaseous moles decreases from left to right so entropy also decreases.
(vi) CH₃OH (l) --> CH₃OH (g) ΔS° > 0 or positive
Because during this phase transition Liquid to gaseous randomness increases and hence entropy also increases.