which of the following are mixtures?
1. air (mostly n2 and o2)
2. salt (NaCl)
3. Salt Water
4. Water (h20)
is the answer 4 and 2 ?
air is a mixture and salt water is a mixture
No. H2O is a compound as is NaCl (tble salt). Air is a mixture. Salt water is hard to say since I don't know enough about the source. If you dissolve NaCl in H2O you get a solution; if you do this in ocean water it may be a mixture because there are solid particles in there also.
No, the answer is 1, 3, and 4.
1. Air: Air is a mixture because it consists of a combination of different gases, primarily nitrogen (N2) and oxygen (O2), along with other trace gases.
2. Salt (NaCl): Salt is a compound, not a mixture. It is made up of the elements sodium (Na) and chlorine (Cl) bonded together in a fixed ratio.
3. Salt Water: Saltwater is a mixture because it consists of a mixture of water (H2O) and dissolved salt (NaCl). It is commonly found in oceans, seas, and even in saltwater aquariums.
4. Water (H2O): Pure water, without any added substances, is a compound. However, in reality, water often contains impurities and dissolved substances, making it a mixture. So, water can be considered a mixture as well.
Yes, the answer is 2 and 4. Salt (NaCl) and water (H2O) are both considered mixtures.
To determine if a substance is a mixture, you need to understand its composition. A mixture is a material made up of two or more substances that are physically combined, where each substance retains its own properties.
In the given options, salt (NaCl) is a mixture because it is composed of sodium ions (Na+) and chloride ions (Cl-), which are chemically bonded together but can be dissociated when dissolved in water. This dissociation allows the salt to be separated into its individual components.
Water (H2O) is also considered a mixture because although it is a compound composed of hydrogen and oxygen atoms, it can exist in various forms such as liquid (water), solid (ice), or gas (water vapor). These different forms of water demonstrate that it can exist as a mixture of its components under different conditions.
On the other hand, air (mostly N2 and O2) and saltwater are not considered pure mixtures but rather solutions. Air is a mixture of gases, primarily nitrogen (N2), oxygen (O2), and trace amounts of other gases. Saltwater is a solution composed of water and salt (NaCl), where the salt is dissolved in the water.