Why syringe and needles have pointed ends? Needle are meant for piercing things. So, the pointed tips allows the needle to exert high pressure on the surface to be pierced. So, for small surface area, ie. For pointed tips small force can produce large pressure. Why do we make needles sharp and pointed? When a […]
Is chemistry better than physics?
Is chemistry better than physics? Understanding is more effective in physics than is memorization. If you pick experimental physics or chemistry you will crunch a lot of data and use statistics a lot. Apart from the statistics, physics requires more advanced levels of mathematics than chemistry. What is the hardest topic in chemistry? Most of […]
Is it dangerous to drive a car with a gas leak?
Why do I feel drained after an MRI?
Why do I feel drained after an MRI? Gadolinium, a rare earth metal, is used to as a “contrast agent” to improve the quality of images in around 30% of MRI scans. But some patients claim they have experienced debilitating pain, chronic fatigue and involuntary muscle spasms after being injected with the chemical. How much […]
How did the cotton gin impact the growth and harvesting of cotton?
How did the cotton gin impact the growth and harvesting of cotton? Although the introduction of the cotton gin meant that cotton processing became less labor-intensive, it allowed planters to increase their profits substantially. This, in turn, prompted them to add more cotton acreage, which led to the need for more workers because the cotton […]
What eventually happened to the gaps in the periodic table?
What eventually happened to the gaps in the periodic table? What eventually happened to these gaps? Mendeleev left gaps in between his periodic tabel as he knew that no exisiting (undiscovered) element could fill the gap and that there has to be an element. The gaps were eventually filled when new elements were discovered. What […]
What amino acids are found on the surface of proteins?
What amino acids are found on the surface of proteins? These are serine (Ser), threonine (Thr), cysteine (Cys), asparagine (Asn), glutamine (Gln), and tyrosine (Tyr). These amino acids are usually found at the surface of proteins, as discussed in the Proteins 2 module. How do you know if an amino acid is hydrophobic? Hydrophobic amino […]
How can food be protected from enzymatic browning?
How can food be protected from enzymatic browning? Adding citric, ascorbic or other acids, such as vinegar, lowers the pH and prevent enzymatic browning. The water reduces contact with oxygen and prevents enzymatic browning. • Cooking fruits or vegetables inactivates (destroys) the PPO enzyme, and enzymatic browning will no longer occur. What factors influence the […]
How does the distance of stars determine their size and brilliance?
How can we increase power?
How can we increase power? To increase power: Increase alpha. Conduct a one-tailed test. Increase the effect size. Decrease random error. Increase sample size. What three factors can be decreased to increase power? What three factors can be decreased to increase power? Population standard deviation, standard error, beta error. How can I increase my brain […]