Explanation:
You may not realise it, but you come across aldehydes and ketones many times a day. Take cakes and biscuits, for example. Their golden, caramelised crust is formed thanks to the Mailliard reaction. This is a process that occurs at temperatures above 140° C, when sugars with the carbonyl group in foods react with nucleophilic amino acids to create new and complex flavours and aromas.
Another example is formaldehyde. Correctly known as methanal, it is the most common aldehyde in industry. It has multiple uses, such as in tanning and embalming, or as a fungicide. However, we can also react it with different molecules to make a variety of more useful compounds. These include polymers, adhesives and precursors to explosives. But how do aldehydes and ketones react, and why?You should remember from Aldehydes and Ketones that they both contain the carbonyl functional group , . This is a carbon atom joined to an oxygen atom by a double bond. Let's take a closer look at it.
If we compare the electronegativities of carbon and oxygen, we can see that oxygen is a lot more electronegative than carbon.
Answer:
CaC2 + 2H20 ⇋Ca(OH)2 + C2H2
Explanation:
CaC2 + A H20 ---> Ca(OH)2 + A C2H2
This is calcium carbide reacting with water to produce calcium hydroxide and ethyne commonly called acetylene.
Let's now balance the equation.
CaC2 + 2H20 ⇋Ca(OH)2 + C2H2
The amount of matter inside an object is called the object’s mass.
Answer:
B. Quartz represents an element as SiO2
Explanation:
A chemical element is a substance composed of only one kind of atom that determines its own unique properties that are different from that of other elements. An element cannot be broken down further as it represents the simplest form a substance can attain.
Chemical elements are usually labelled using symbols. These symbols contain only one capital letter for each element, which cannot excede two alphabets. For example, Silicon is an element with the symbol, Si while Calcium is an element with symbol Ca.
Note: in this question, Quartz (SiO2) is not an element but rather a compound because it is composed of two elements, forming a compound.