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What is a chemical change?

Chemical reactions can either be exothermic or endothermic. Exothermic reactions produce heat, while endothermic reactions require heat for the reaction to occur. When a chemical reaction occurs, the atoms are rearranged, and an energy change also occurs as new products are produced. These new products have different chemical properties from the substances used to cause the reaction.\nA change in color, odor or composition can indicate that a chemical change has occurred. For example, paper turns to ash when burned. A change in energy, such as the loss or production of heat or the decompositio..

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Which organelle in the cell produces lipids?

The endoplasmic reticulum is made up of membranous sacs and tubules. It has two different portions: the smooth endoplasmic reticulum and the rough endoplasmic reticulum. The rough endoplasmic reticulum is studded with ribosomes and produces proteins that are incorporated into cellular membranes outside of the cell.\nThe smooth endoplasmic reticulum lacks ribosomes on its cytoplasmic surface. It is especially important in muscle cells, where the specialized sarcoplasmic reticulum stores calcium ions, which are needed for triggering contraction of muscle cells.

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What are some characteristics of the kingdom Eubacteria?

Eubacteria all have cell walls made of peptidoglycan, a different substance than the cellulose found in plant cell walls. Not all have flagella for moving around, but those that do are quite different from those found in eukaryotes, and are made from a single large protein filament. Their DNA is also often found in just one chromosome, which can be quite large. Bacteria reproduce by binary fission, which is a much simpler process than the mitosis by which eukaryotic cells divide.\nEubacteria fit differently into different taxonomic naming schemes. The group is often referred to as a kingdom, b..

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Can a pit bull mate with a Chihuahua?

All dogs, no matter what the breed, are members of the species Canis lupus familiaris. Scientists consider the dog to be a subspecies of the gray wolf. Selective breeding by humans is responsible for the remarkable number and variety of different breeds. Regardless of their size and appearance, all dogs are theoretically capable of interbreeding and producing offspring.

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What is the function of glass rod?

Glass stirring rods are primarily used in science laboratories for chemistry or biology experiments. Stirring rods are important because stirring a solution, which is also known as agitation, causes a reaction to happen faster.\nGlass rods are also used to spread liquid substances on a solid surface. It is preferable to a metal rod because glass is not a good conductor of heat and metal is. Metal has free electrons. Therefore, in metals, conduction takes place due to the atomic vibration and the drift of the free electrons. Glass on the other hand, being a non-metal, does not have free electro..

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What is the melting point for coconut oil?

To melt coconut oil for recipes, the oil and its container can be placed near a heating duct or run under warm water. However, these methods can take a long time to melt the oil if there is a large amount of it in the container. To quicken the melting time, remove the amount of coconut oil needed for a recipe, and melt it over the stove or in the microwave.

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What happens after a volcano erupts?

The ash from the volcano often settles in rivers and streams, forming temporary and unstable dams that cause water levels to increase. If the unstable material breaks free, flooding occurs downstream. The unstable ash also causes landslides, especially during heavy rains. The pressure release affects nearby landforms and may result in shifting of plates to cause earthquakes. Lava is extremely hot, causing ignition of organic materials, including trees. In highly forested areas, forest fires often follow volcanoes.\nThe ash in the air continues to affect humans in the area. Those with asthma an..

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What role does ATP play in photosynthesis?

Chemiosmosis is the process by which plant cells produce ATP. A group of protons hurries over a membrane, and ATP molecules synthesize as a result. The process of passing over the membrane causes energy to leach out of the protons, and that energy creates the high-energy bonds within ATP.\nAfter the second phase of photosynthesis begins, ATP provides the energy for the development of phosphoglycerate molecules and the conversion of those molecules into organic compounds. These organic compounds eventually combine to form six-carbon glucose. The plants then store glucose in different ways. Some..

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What are some facts about the Canadian Shield?

Other names for the Canadian Shield include the Precambrian Shield and the Laurentian Plateau. It is made of primarily of granite and covers 1.7 million square miles. In addition to granite, it contains deposits of iron, gold, silver, uranium, platinum, nickel and copper. Diamonds are also found in the Canadian Shield and are mined in Canada's Northwest Territories. Some of the world's oldest-known fossils lie in the Canadian Shield; fossil bacteria and algae in the region date back about 2.2 billion years.\nFour mountain ranges rise from the Canadian Shield: the Adirondack Mountains..

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How many valence electrons does molybdenum have?

The symbol for molybdenum is Mo. It is classified as a transition metal and placed in group 6 or d-block and period 5 of the periodic table of elements. Its atomic mass is 95.96 grams per mole, and it has a density of 10.2 grams per centimeter cubed. It is a solid at room temperature and melts at 4,753 degrees Fahrenheit. Molybdenum was discovered by Carl Scheele in 1778 and later isolated by Peter Hjelm in 1781.

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