The number of neutrons in a nucleus affects the mass of the atom but not its chemical properties. Thus, a nucleus with six protons and six neutrons will have the same chemical properties as a nucleus with six protons and eight neutrons, although the two masses will be different.
Answer:
Reaction with water: Aluminum oxide is insoluble in water and does not react like sodium oxide and magnesium oxide.
Answer:
Plastics are large organic molecules called polymers.
Explanation:
Plastics can be defined as materials that can be shaped when soft and then hardened to keep their shape. They are synthetic (artificially made) or semi-synthetic, derived from materials found in nature, such as natural gas, oil, coal, minerals, and plants.
As they are derived from natural, organic materials, plastics also consist of organic molecules. Their molecules are very large and long and consist of many repeating subunits. Materials with this type of structure are called polymers.
This is why the second option is the correct one.
Answer:
[OH⁻] = 1.1 × 10⁻³ M
Explanation:
<em>An aqueous solution at 25°C has a H₃O⁺ concentration of 8.8 × 10⁻¹² M. Calculate the concentration of OH⁻. Be sure your answer has 2 significant digits.</em>
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Step 1: Given data
Concentration of H₃O⁺ ([H₃O⁺]): 8.8 × 10⁻¹² M
Concentration of OH⁻ ([OH⁻]): ?
Step 2: Calculate the concentration of OH⁻
Let's consider the self-ionization of water.
2 H₂O(aq) ⇄ H₃O⁺(aq) + OH⁻(aq)
The equilibrium constant for this reaction is:
Kw = [H₃O⁺] × [OH⁻] = 1.0 × 10⁻¹⁴
[OH⁻] = 1.0 × 10⁻¹⁴ / [H₃O⁺]
[OH⁻] = 1.0 × 10⁻¹⁴ / 8.8 × 10⁻¹²
[OH⁻] = 1.1 × 10⁻³ M
Explanation:
The cross-sectional area of the specimen is calculated as follows.
= 
= 
Equation of stress is as follows.
And, the equation of strain is as follows.
Hence, the Hook's law is as follows.
E = 
E = 
= 
or, 
= 
= 0.6554 m
or, 
= 655.4 mm
Thus, we can conclude that the maximum length of the specimen before deformation if the maximum allowable elongation is 0.48 mm is 655.4 mm.
