Science

Refine Search

Why are hydrocarbons not soluble in water?

While water and hydrocarbons appear to mix initially, allowing the container to remain undisturbed results in the formation of two liquid layers. One is water and the other is the hydrocarbon. The densities of water and the hydrocarbon determine which floats on top of the other. Scientists use the word immiscible to describe this phenomenon.\nFor a solution to form, a molecule of the water must attract a molecule of the hydrocarbon with a greater strength than the hydrocarbon exhibits for the same molecule. With the polar and nonpolar mix, this does not occur and the two distinct layers form. ..

Continue Reading

What is NH4 in chemistry?

An ammonium ion is formed by a reaction between ammonia, or NH3, and a hydron ion, which is a positively charged hydrogen atom symbolized as H+. A pair of electrons forms the bond between the ammonia molecule and the hydrogen ion.\nAmmonium is often found in compound salts, such as ammonium chloride and ammonium carbonate. It has a molar mass of 18.03 grams per mole and an acidity level of 9.25.

Continue Reading

What type of rock makes up the continental crust?

The continental crust floats above the Earth’s mantle, as it is made up of a less dense material. The continental crust is also less dense than the oceanic crust, which is primarily made of basalt. However, the continental crust is up to 40 kilometers thicker than the oceanic crust, which is 7 to 10 kilometers thick. Around 40 percent of Earth’s surface is underlain by the continental crust.

Continue Reading

When do frogs lay eggs?

The frog eggs hatch into aquatic larvae with tails and gills. These larvae are called tadpoles. Not all frogs follow this pattern of egg laying. Some frogs have internal fertilization, and other frogs give birth to live young. Adult frogs have semi-permeable skin, which makes them susceptible to dehydration. This is why frogs live in moist or humid habitats.

Continue Reading

What can make a hurricane lose its power?

Hurricanes form when warm ocean waters heat the air above the surface. This causes evaporation of sea water into the atmosphere, which sets up the convection currents and rotation that fuel a hurricane. Over land or over cooler water, the hurricane's engine begins to lose power. In addition, areas of strong wind shear can disrupt the rotation and current, which causes the hurricane to die prematurely.

Continue Reading

What is some basic information about cells?

There are two main categories of cells: prokaryotic and eukaryotic cells. Prokaryotic cells are cells whose DNA is not separated from the cytoplasm. All known prokaryotes are single cells. Eukaryotic cells are cells whose DNA is separated from the cytoplasm. Some eukaryotes are single-celled entities, while others, such as plants and humans, are multicellular organisms.\nAll cells, whether eukaryotic or prokaryotic, share some features. These include DNA, plasma membrane, cytoplasm and ribosomes. DNA is responsible for the genetic information about an organism. It is located in the nonmembrane..

Continue Reading

What is the temperature range of Neptune?

Neptune's atmosphere is made up of a cloak of cold clouds that consist of about 80 percent hydrogen, 18.5 percent helium and 1.5 percent methane.\nNeptune is subjected to constant weather changes and has high-altitude clouds that consist of methane ice crystals. These massive clouds resemble cyclonic storms and are constantly circling the planet at speeds as high as 1,200 miles per hour. The severe wind speeds and dynamic atmosphere on Neptune are greatly influenced by its massive internal heat source. Neptune is a gas giant, is the eighth planet in the solar system, and has 13 known moon..

Continue Reading

How old is the oldest tree ever found?

The oldest individual tree is a bristlecone pine tree growing in an undisclosed location in the White Mountains of California. Methuselah, the world's second-oldest tree, is of the same species and in the same area. Methuselah is approximately 4,845 years old. Old Tjikko, a Norway spruce in the Dalarna province of Sweden, is roughly 9,550 years old. However, Old Tjikko is a clonal tree, meaning that its roots are the only part of the tree that has stayed alive, while the rest of the organism is vegetatively cloned.

Continue Reading

Why do objects weigh less in water?

Another way of explaining Archimedes' Principle is that an object in water has two forces acting on it at once. Gravity is pulling the object down, while buoyancy is pushing the object up, which makes the object feel lighter. If the object sinks, it still weighs less the amount of the water it has displaced.

Continue Reading

How are cheek cells and onion epidermal cells different?

Another difference is that the cytoplasm of a cheek cell is more granular, is denser and occupies a larger space than the cytoplasm of an onion epidermal cell. While both cells have a nucleus, the positioning is different, as it is at the periphery of an onion cells’ cytoplasm, while the nucleus of a cheek cell is positioned centrally. The vacuole of an onion cell is prominent, but it is very small in a cheek cell, and is absent in some other cells.\nWhile cheek cells are spherical, onion epidermal cells are rectangular. Cheek cells have lysosomes but onion epidermal cells do not. The two ce..

Continue Reading
Showing 7401 to 7410 of 10000 (1000 Pages)