Sodium hydroxide (like soda)
Reason - has strong alkaline sodium hydroxide and hydrogen gas when reacted. This is an exothermic reaction-Sodium is heated and may catch on fire and burn with a orange flame.
The formation of rust (equation above) is an example of both combustion and Synthesis
<h3>What is a synthesis reaction?</h3>
- A synthesis reaction is a classification of responses in which multiple reactants connect to form a single product.
- If we observe the equation, no replacement is accepted place hence, single and double replacements are wrong choices.
- In decomposition reaction there is only one reactance which gets disintegrate and form multiple product.
- Synthesis reactions are reactions that occur when two additional atoms or molecules interact to form a separate molecule or compound. Most of the time, when a synthesis reaction occurs, energy is discharged and the reaction is exothermic. However, an endothermic consequence is also feasible.
learn more about synthesis reaction, refert o:
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Answer:
1620 cm⁻¹·M⁻¹
Explanation:
<em>Beer's Law </em>states that:
A = ε * b * C
Where A is the absorbance, ε is the Molar Absorptivity coefficient, b is the path length, and C is the molar concentration.
<u>Use the given data</u>:
0.405 = ε * 0.5 cm * 5x10⁻⁴ M
And <u>solve for ε</u>:
ε = 1620 cm⁻¹·M⁻¹
So the Molar Absorptivity coefficient of Compound X at this 265 nm is 1620 cm⁻¹·M⁻¹.
Answer:
32 mL
Explanation:
<em>A chemist must prepare 500.0mL of hydrobromic acid solution with a pH of 0.50 at 25°C. He will do this in three steps: Fill a 500.0mL volumetric flask about halfway with distilled water. Measure out a small volume of concentrated (5.0M) stock hydrobromic acid solution and add it to the flask. Fill the flask to the mark with distilled water. Calculate the volume of concentrated hydrobromic acid that the chemist must measure out in the second step. Round your answer to 2 significant digits.</em>
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Step 1: Calculate [H⁺] of the dilute solution
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -0.50 = 0.32 M
Step 2: Calculate [HBr] of the dilute solution
HBr is a strong acid that dissociates according to the following equation.
HBr ⇒ H⁺ + Br⁻
The molar ratio of HBr to H⁺ is 1:1. The concentration of HBr is 1/1 × 0.32 M = 0.32 M.
Step 3: Calculate the volume of the concentrated HBr solution
We will use the dilution rule.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂ / C₁
V₁ = 0.32 M × 500.0 mL / 5.0 M
V₁ = 32 mL
