What is the 17th element on the periodic table?

Answer : The correct option is hydrogen and oxygen gas combining to form water vapor.

Explanation :

Phase change : It is a change from one state to another state without changes in chemical composition.

Phase change such as solid to liquid, liquid to vapor, vapor to liquid, liquid to solid, vapor to solid, solid to vapor.

• Melting of snow is a fusion process in which phase changes from solid to liquid.

• Evaporation of water from the ocean is a evaporation process in which phase changes from liquid to vapor.

• Condensation of water vapor to form clouds  is condensation process in which phase changes from vapor to liquid.

• Hydrogen and oxygen gas combining to form water vapor, there is no phase change in this reaction because a gas combine with another gas to form a water vapor as a gas.

Answer:

The Flow of science keeps going because not everything is fully discovered yet. New things are discovered everyday and are also made better as well.

Explanation:

Answer: Option (a) is correct.

Explanation:

When an object moves from its initial position, it acquires some energy. This energy is called kinetic energy, as it is governed by the motion of an object.

The formula to calculate kinetic energy is as follows.

                   kinetic energy =

where,    

            m = mass of object

            v = velocity of object

Thus, it is concluded that kinetic energy is the energy an object has due to its motion.

Answer:

Explanation:

Overuse of antibiotics leads to bacteria's resistance against our drugs. This is increasing at an alarming rate and the reason is that overuse of antibiotics kills bacteria that lack the "resistance" gene or gene that can help them survive the antibiotics (similar is the case for insects that die to insecticides). But, some bacteria can have random mutations in their gene that can help them survive the antibiotic (similar is the case for some insects that can survive the insecticide), thus the surviving bacteria give rise to next generation of bacteria that are resistant to the given antibiotic (similar to how insects that survive the insecticide give birth to new insects that are resistant to insecticide too). Soon, every generation adds new antibiotic resistant bacteria (or new insecticide resistant insects in the case of insects) which is dangerous for all of life on this planet. Therefore, both are similar in the sense that new generations of these organisms will be resistant to our weapons against them.

The answer is: sucrose.

Polystyrene, nylon and PVC are examples of a polymer.

Sucrose or table sugar (C₁₂O₂₂O₁₁) composed of two monosaccharides. This monosaccharides glucose and fructose are linked with an ether bond between C1 on the glucosyl subunit and C2 on the fructosyl unit.

Polystyrene is a synthetic aromatic hydrocarbon polymer made from the monomer styrene.

Styrene (ethenylbenzene) is an organic compound with the chemical formula C₆H₅CH=CH₂. It is a colorless oily liquid.

Plastic PVC is organic polymers of high molecular mass derived from petrochemicals.

Final answer:

Among Polystyrene, Nylon, PVC, and Sucrose, the compound that is not a polymer is Sucrose because it is a smaller, simple molecule comprised of two monosaccharides and does not have a long chain of repeating units.

Explanation:

In considering the options provided, Polystyrene, Nylon, and PVC are all polymers. Polymers are made up of many similar units or monomers, and they typically have high molecular weights. Polystyrene, Nylon, and PVC, which stands for Polyvinyl Chloride, are large molecules made up of repeating subunits. The only one which does not fit this particular basis is Sucrose.

Sucrose, commonly known as table sugar, is a small, simple molecule. It is a disaccharide, meaning it is composed of two monosaccharides, glucose and fructose. Therefore, it is not a polymer because it does not contain a long chain of repeating units.

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