Answer:
A. The color change from blue to green happens in nature.
Explanation:
The color change is an indicator of a chemical reaction that has occurred. Although color changes are not necessarily good diagnostic tool to measure if a chemical reaction has occurred or not.
In this reaction, color changes is quite an effective tool Chemical changes usually involves the formation of a new product from the chemical reaction. Also, the steps are not easily reversible.For this reaction, color change is the most appropriate signal for a chemical change.The evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.
The electrochemical series is arrangement of elements in order of decreasing reactivity. It is important to note that the elements that are high up in the electrochemical series can displace the elements that are lower in the series from their aqueous solution.
Steel contains iron which lies above copper in the electrochemical series hence a chemical change occurs when steel dissolves in the copper solution.
Hence, the evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.
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We cooleda water bottle so the volume was lowered to .050 L, then we heated it to 373 K and thevolume increased to .10 L. What was the initial temperature?
Answer:
[tex]186.5\ \text{K}[/tex]
Explanation:
[tex]V_1[/tex] = Initial volume = 0.05 L
[tex]V_2[/tex] = Final volume = 0.1 L
[tex]T_1[/tex] = Initial temperature
[tex]T_2[/tex] = Final temperature = 373 K
From the ideal gas law we have
[tex]PV=nRT[/tex]
So
[tex]V\propto T[/tex]
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\Rightarrow T_1=\dfrac{V_1}{V_2}\times T_2\\\Rightarrow T_1=\dfrac{0.05}{0.1}\times 373\\\Rightarrow T_1=186.5\ \text{K}[/tex]
The intial temperature is [tex]186.5\ \text{K}[/tex].
if compose means to put together then decompose means to what?
Answer:
Break apart
Explanation:
Decompose: to break down or cause to break down into component elements or simpler constituents.
What reaction would the chemical equation 2H2O→2H2+O2 represent?
combustion of water
decomposition of water
replacement of water
formation of water
Answer:
decomposition of water
Explanation:
The reaction will represent the decomposition of water. It usually carried by an electrolytic process in the laboratory.
Water molecule is broken down into its constituent hydrogen gas and oxygen gas components. The breaking down of one compound to give other compounds is decomposition. This is not a replacement reaction. In decomposition, we often start with a single reactant and results in one or more products.Answer:
decomposition of water
Explanation:
i took the quiz and it was right
Write down the names of compounds represented by the following formulae:
a. Al2(SO4)3
b. CaCl2
c. K2SO4
d. KNO3
e. CaCO3
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The compounds have been formed by the combination of molecules and atoms. The names are a. aluminum sulfate, b. calcium chloride, c. potassium sulfate, d. potassium nitrate, and e. calcium carbonate.
What is the chemical formula?The chemical formula has been defined as the representation of the chemical compound or molecules with the aid of symbols, letters, and coefficients to show the proportions, arrows, parentheses, signs, etc.
The chemical formulas are named as:
Al₂(SO₄)₃ - aluminum sulfate. It has been used in purifying water, sewage treatment, tanning, paper industries, etc.CaCl₂ - calcium chloride. It is an ionic compound used in making electrolytes and sports drinks.K₂SO₄ - potassium sulfate. It has been used for making fertilizers for tobacco and vegetable crops.KNO₃ - potassium nitrate. It is an oxidizer used for making explosives and fertilizers.CaCO₃ - calcium carbonate. It is used as a dietary product to satisfy the needs for calcium and vitamin D for bone strengthening and formation.Learn more about chemical formulas, here:
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