What are the evidences of physical and chemical changes?

What are the evidences of physical and chemical changes? Common physical changes include melting, change of size, volume, color, density, and crystal form. The classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change. Is a change in texture physical or chemical? […]

Does nitrous oxide show up on drug tests?

Does nitrous oxide show up on drug tests? Inhaled nitrous oxide can be detected in blood or urine shortly after exposure20,21 using special techniques and precautions,14 but it is not detected on results of routine drug screening panels. Does nitrous oxide affect fertility? Our data suggest that exposure to high levels of unscavenged nitrous oxide […]

Are antibonding orbitals empty?

Are antibonding orbitals empty? Antibonding orbitals form upon out-of-phase orbital overlap, which is destructive interference. They always form alongside bonding orbitals, due to conservation of atomic orbitals. But, they are not always occupied. A new node forms between the antibonding orbitals, a region in which electrons cannot be. Do antibonding orbitals exist? Orbital symmetry must […]

Is the cat alive or dead?

Is the cat alive or dead? The Copenhagen interpretation of quantum mechanics implies that after a while, the cat is simultaneously alive and dead. Yet, when one looks in the box, one sees the cat either alive or dead, not both alive and dead. Did Schrodinger own a cat? Erwin Schrödinger doesn’t appear to have […]

Is lobster a crab or shrimp?

Is lobster a crab or shrimp? Crustaceans (Crustacea /krʌˈsteɪʃə/) form a large, diverse arthropod taxon which includes such animals as crabs, lobsters, crayfish, shrimps, prawns, krill, woodlice, and barnacles. What class are lobsters? Malacostracans Are lobsters related to roaches? While people often call lobsters the “cockroaches of the sea,” lobsters are not very closely related […]

What are the negatives of mountaintop removal?

What are the negatives of mountaintop removal? Toxic heavy metals such as cadmium, selenium, and arsenic leach into local water supplies, poisoning drinking water. This destructive practice, known as mountaintop-removal mining, sends carcinogenic toxins like silica into the air, affecting communities for miles around. How does burning coal contribute to climate change it releases? The […]

How do you calculate Joule-Thomson effect?

How do you calculate Joule-Thomson effect? The Joule-Thomson equation is μ = (T1 – T2) / (P1 – P2) where μ is the Joule-Thomson coefficient, T1 is the initial temperature, T2 is the final temperature, P1 is the initial pressure and P2 is the final pressure. How is the Joule-Thomson coefficient derived? Here we are […]

Do you drill wood fast or slow?

Do you drill wood fast or slow? Tip 3: choose the right RPM If you drill too fast, chances are your wood might burn. If you drill too slow, the drill hole might not turn out as nice. Should I lubricate drill bit? Lubricating the bit reduces friction and heat buildup, which makes drilling easier […]

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