Category: Physics

Is calcium carbonate a ionic compound? Calcium carbonate (CaCO3) has ionic bonding between calcium ion Ca2+ and a polyatomic ion, CO2−3, but within the carbonate ion (CO32-), the carbon and oxygen atoms are connected by covalent bonds (shown above). Why calcium carbonate has both ionic and covalent bond? Calcium carbonate is another example of a […]

Can concave lens produce real image? Convex (converging) lenses can form either real or virtual images (cases 1 and 2, respectively), whereas concave (diverging) lenses can form only virtual images (always case 3). Real images are always inverted, but they can be either larger or smaller than the object. What are the properties of lenses? […]

Which is the best power shower? The best power showers to buy Aqualisa Aquastream: The best all-round power shower. Mira Event XS: The best mid-range power shower. Triton AS2000SR: The best low-noise power shower. Mira Vigour Manual: The best budget power shower. Bristan Hydro Power 1500: A rock-solid, low-cost power shower. Can I use 6mm […]

Is iron rusting in the presence of moist air a physical change? Rust is a reddish-brown substance formed on iron when it has been exposed to fresh air and moisture for a long time. This process is a chemical change called rusting. What is the chemical reaction of rusting? Rusting is an oxidation reaction. The […]

How do you know which direction is north at night? Use the Big Dipper It’s Polaris, the North Star. Polaris is over the North Pole, so if you find it in the night sky, you’ll know where north is. How can you tell which direction you are facing? Method 1. Stand with your right arm […]

Do I have to memorize kinematic equations for MCAT? Kinematic equations are the foundation to mastering MCAT physics. Yes you have to ‘memorize’ and know the standard formulas, but it goes deeper than that. You have to understand the units, when to use which equation, and be VERY comfortable applying these concepts to the more […]

How do you do IV push medications? Scrub the end cap on your IV line for 15 seconds with a fresh alcohol pad and let it air dry. Twist the syringe of heparin or citrate into the end of your IV line. “Pulse flush” your IV line with the syringe of heparin or citrate. Before […]

How is temperature determined? Temperature is the quantity measured by a thermometer. Temperature is related to the average kinetic energy of atoms and molecules in a system. Absolute zero is the temperature at which there is no molecular motion. There are three main temperature scales: Celsius, Fahrenheit, and Kelvin. Does reheating meat kill bacteria? Proper […]

What will be the pulse rate during heart attack? A very high or very low heart rate may reveal your risk for heart attack. For most people, a heart rate that’s consistently above 100 beats per minute or below 60 beats per minute for nonathletes should prompt a visit to a doctor for a heart […]

What color of light has the highest frequency? Violet waves What is the depression of light? Dispersion of light is caused by the change of speed of light ray (resulting in angle of deviation) of each wavelength by a different amount. Note: White light comprises of seven visible colours (VIBGYOR) whereas black (or dark) signifies […]