Answer:
Aluminum hydroxide Al(OH)3
Explanation:
Sodium switches places with Aluminum and the new products are formed.
A balanced equation would look like this.
AlCl3 + 3NaOH → Al(OH)3 + 3NaCl
Answer: caffeine is a compound.
Explanation:
1) As stated c<span>affeine contains hydrogen, carbon, nitrogen, and oxygen atoms in a fixed ratio.
2) The definition of compound is a pure substance formed by chemical bonding of two or more fifferent elements. That means a defined ratio of the elements in the compound, which conferes uniform and equal properties to every part of the compound.
Some examples of compounds are salt (NaCl), water (H2O), vinegard (CH3 COOH).
A mixture combines several elements or compounds, not bonded by chemical bonds but mixed in ratios which may vary.
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Answer:
Gene - determines the trait (phenotype)
Boiling point
Explanation:
The likely dependent variable the student used in this experiment is boiling point temperature
The amount of heat supplied will determine when a substance will boil or not based on the intermolecular force in them.
- In an experiment, the dependent variable is treated as the effect produced.
- It is the variable that relies on the outcome of the experiment.
- The independent variable is responsible for the changes in the experiment.
- The cause is the independent variable. It does not rely on the outcome of the experiment.
- The dependent variable is the boiling point.
- The independent variable is the amount of heat supplied or temperature changes.
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Answer:
Incomplete question: A student prepares a 0.54 mM aqueous solution of butanoic acid...
The answer is: The percentage of dissociation is 15.4%
Explanation:
Given:
Ka = 1.51x10⁻⁵
Concentration = 0.54 mM = 0.54x10⁻³M
The reaction is:
C₄H₈O₂ = C₄H₇O₂⁻ + H⁺
I 0.54x10⁻³ 0 0
E 0.54x10⁻³(1-x) 0.54x10⁻³x 0.54x10⁻³x
Where x is the degree of dissociation
![Ka=\frac{[H^{+}][C_{4}H_{7}O_{2}^{-} }{[C_{4}H_{8}O_{2} } \\1.51x10^{-5} =\frac{0.54x10^{-3}x^{2} }{1-x} \\x^{2} +0.028x-0.028=0\\x_{1} =0.154\\x_{2} =-0.182](https://tex.z-dn.net/?f=Ka%3D%5Cfrac%7B%5BH%5E%7B%2B%7D%5D%5BC_%7B4%7DH_%7B7%7DO_%7B2%7D%5E%7B-%7D%20%20%20%20%20%7D%7B%5BC_%7B4%7DH_%7B8%7DO_%7B2%7D%20%20%20%7D%20%5C%5C1.51x10%5E%7B-5%7D%20%3D%5Cfrac%7B0.54x10%5E%7B-3%7Dx%5E%7B2%7D%20%20%7D%7B1-x%7D%20%5C%5Cx%5E%7B2%7D%20%2B0.028x-0.028%3D0%5C%5Cx_%7B1%7D%20%3D0.154%5C%5Cx_%7B2%7D%20%3D-0.182)
We will choose the positive value
x = 0.154
The percentage of dissociation is 15.4%
