To most geologists, the term "acid test" means placing a drop of dilute (5% to 10%) hydrochloric acid on a rock or mineral and watching for bubbles of carbon<span> dioxide gas to be released. The bubbles signal the presence of carbonate minerals such as</span>calcite<span>, </span>dolomite<span>, or one of the minerals listed in Table 1.</span>
The given question is incomplete, the complete question is:
Which of these can be considered a system? Check all that apply.
O a computer
O a car
O a bicycle pedal
O a pencil
O a coffeemaker
Answer:
The correct options are a computer, a car, and a coffeemaker.
Explanation:
An array of rules or the group of things, which function together to attain a specific goal is termed as a system. When these things are considered individually, they are insignificant and are just components of something. However, when these things get associate and get monitored with an array of rules, they start to function towards a specific goal.
In the given question, similarly, the car, computer, and a coffeemaker are considered as systems, as they exhibit distinct components that function in combination to achieve a cumulative goal. While a pencil and the pedal of a bicycle are just parts.
The reactants of the reaction of single replacement that produces ZnCl₂ and H₂ is Zn + 2HCl
Explanation
In a single replacement reaction is a chemical reaction whereby an element react with compound and take the place of another element in that compound.
zn displaces H from HCl to form ZnCl₂ and H₂ according to below equation.
Zn +2HCl → ZnCl₂ + H₂
Cobalt is a solid, it’s a hard metal, it’s magnetic and brittle.
