Select one or more:
a. Chlorine forming a solid precipitate
b. Bubbles forming from hydrogen gas production
c. Solid zinc dissolving
d. Bubbles forming from chlorine gas production
Three main approaches are available for observational research: controlled observations, naturalistic observations, and participant observations. The two categories of observation are qualitative and quantitative. The correct option is A.
The observation approach entails watching, either manually or mechanically, what people actually do or what happens when they buy or consume something. Information is gathered by watching processes in action. Observations might be either qualitative or quantitative. Scientists make both qualitative and quantitative observations to acquire knowledge.
Observations that describe something's "qualities" are referred to as qualitative observations. These wouldn't involve counting or measuring and would instead contain qualities like texture, color, and shape. Utilizing standard scales to count or measure is a requirement for quantitative observations.
Thus the correct option is A.
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The correct answer is:
qualitative and quantitative.
Explanation:
Observation is the rapid retrieval of information from a first source. In living beings, observation contracts the senses. In science, observation can also include the recording of data via the use of scientific tools. Qualitative observation is a personal process of collecting data or knowledge while quantitative observation is an objective process of accumulating data or information.
B. 1/1 H
C. 0/1 H
D. 2/1 H
(2) 3.0 grams of HCl per mole of solution
(3) 3.0 moles of HCl per liter of solution
(4) 3.0 moles of HCl per mole of water
Answer : The correct option is, (3) 3.0 moles of HCl per liter of solution
Explanation :
Molarity : It is defined as the number of moles of solute present in one liter of the solution. The S.I unit of molarity is mole per liter.
It is represented as,
where,
V = volume of solution in liter
As we are given 3.0 M HCl(aq) solution this means that 3.0 moles of HCl present in one liter of solution.
Hence, a 3.0 M HCl(aq) solution contains a total of 3.0 moles of HCl per liter of solution.
B) 2NaCl + F2 → 2NaF + Cl2
C) 2AlBr3 + 3K2SO4 → 6KBr + Al2(SO4)3
D) 2K + MgBr2 → 2KBr + Mg
Answer:
The correct answer is option C.
Explanation:
Double displacement reaction is defined as the reaction in which exchange of ions takes place to give a product.
Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.
From all the given options the reaction which is classified as Double displacement reaction is :
Where as other reactions are the examples of Single displacement reaction.