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Is a year exactly 365.25 days?

Is a year exactly 365.25 days? Background: The true length of a year on Earth is 365.2422 days, or about 365.25 days. We keep our calendar in sync with the seasons by having most years 365 days long but making just under 1/4 of all years 366-day “leap” years. How many days are there left […]

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Where is the fulcrum on the triple beam balance?

Where is the fulcrum on the triple beam balance? Where and what is a fulcrum on a triple beam balance? The fulcrum is somewhere between the pan and the beams, as the other gents have said. The fulcrum is usually referred to as a “knife edge” in balances. From memory, they are often agate in […]

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Is nickel a solid liquid or gas?

Is nickel a solid liquid or gas? Nickel is a chemical element with symbol Ni and atomic number 28. Classified as a transition metal, Nickel is a solid at room temperature. What state is nickel found in? Nickel was discovered by the Swedish chemist Axel Fredrik Cronstedt in the mineral niccolite (NiAs) in 1751. Today, […]

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Is there a genetic link to skin cancer?

Is there a genetic link to skin cancer? Several genes and hereditary syndromes are associated with the development of skin cancer. Basal cell nevus syndrome (BCNS, caused by pathogenic variants in PTCH1 and PTCH2) is associated with an increased risk of BCC. Is skin cancer more common in males or females? Men are more likely […]

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What is the name of silver ore?

What is the name of silver ore? argentite Which is the chief ore of copper? Copper pyrite What is chief ore of iron? Ferruginous rock containing one or more minerals from which metallic iron may be profitably extracted. The chief ores of iron consist mainly of the oxides: hematite, Fe2O3 ; goethite, alpha -FeO(OH); magnetite, […]

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How would you respond to a fire in your laboratory?

How would you respond to a fire in your laboratory? With a fire, people should first evacuate the lab. Once safe, they should close doors, pull the fire alarm, and call emergency services. Anyone who is on fire should stop, drop, and roll. Fighting fires is about cutting off oxygen. What should you do in […]

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What is the independent variable definition?

What is the independent variable definition? Answer: An independent variable is exactly what it sounds like. It is a variable that stands alone and isn’t changed by the other variables you are trying to measure. For example, someone’s age might be an independent variable. What is the variable you keep the same? Essentially, a control […]

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Which of the following can form compounds with xenon?

Which of the following can form compounds with xenon? Xe has least ionisation enthalpy among the noble gases except radon which is radioactive and hence xenon forms chemical compounds particularly with O2 and F2. How do I get xenon? Xenon is present in the atmosphere at a concentration of 0.086 parts per million by volume. […]

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