Is praseodymium man made? He was correct about lanthanum being a new element, but he was wrong about didymium. This new “element” turned out to be a mixture of two other new elements, now called neodymium and praseodymium. The man who made this discovery was Auer. How was praseodymium named? Discovery: Swedish chemist Carl Gustav […]
What are the significant figure rules?
What are the significant figure rules? To determine the number of significant figures in a number use the following 3 rules: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. Which value from his calculation most strongly affects […]
What is the freeze/thaw cycle?
What is the freeze/thaw cycle? What is a freeze-thaw cycle? A freeze-thaw cycle is when the temperature fluctuates from above freezing (32F), to below freezing, and then back to above freezing. This is considered one freeze-thaw cycle, and Minneapolis, Minnesota experiences several freeze-thaw cycles each year. What do freeze/thaw cycles result in? Freeze-thaw cycles can […]
What is the universal system of measure?
What is the universal system of measure? The International System of Units (SI, abbreviated from the French Système international (d’unités)) is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world. What metric unit would you use to measure the […]
How do you bond valence electrons?
How do you bond valence electrons? Ionic bonds are formed through the exchange of valence electrons between atoms, typically a metal and a nonmetal. The loss or gain of valence electrons allows ions to obey the octet rule and become more stable. Ionic compounds are typically neutral. Therefore, ions combine in ways that neutralize their […]
What are 5 non-renewable resources?
What are 5 non-renewable resources? There are four major types of nonrenewable resources: oil, natural gas, coal, and nuclear energy. Oil, natural gas, and coal are collectively called fossil fuels. Fossil fuels were formed within the Earth from dead plants and animals over millions of years—hence the name “fossil” fuels. How can we save renewable […]
Can Exercise change your face shape?
Can Exercise change your face shape? Redistribution of fat: Regular exercise can help to move fat deposits within your body. This can make the face appear more toned and full. Decreased inflammation: When you move more, the body produces chemicals that lower inflammation, one reason why you look and feel healthier when exercising regularly. Does […]
Is JustAnswer a legitimate website?
Is JustAnswer a legitimate website? We appreciate your feedback. JustAnswer is a membership website similar to Hulu or Netflix and we offer a $5 trial membership where you can ask questions to verified professionals in their fields. You have topics available for everything from Legal, Medical, Car Repair, and Taxes to Dream Interpreters. How much […]
What are the base units the SI units are based on number?
What are the base units the SI units are based on number? It comprises a coherent system of units of measurement starting with seven base units, which are the second (the unit of time with the symbol s), metre (length, m), kilogram (mass, kg), ampere (electric current, A), kelvin (thermodynamic temperature, K), mole (amount of […]
Como es el uso de energias limpias que realiza Colombia?
¿Cómo es el uso de energías limpias que realiza Colombia? Al ubicarse en la zona ecuatorial y contar con climas y ecosistemas variados, Colombia cuenta con un gran potencial para desarrollar energías limpias a partir del agua, el viento, el sol y de los residuos de biomasa como los de la caña de azúcar, aceite […]