How much should your heart rate increase when you stand up? A person’s heart rate is usually about 70 to 80 beats per minute when resting. Normally, the heart rate increases by 10 to 15 beats per minute when standing up, and then it settles down again. Why does my heart beat faster when I […]
Is the liquid inside glow sticks dangerous?
Is the liquid inside glow sticks dangerous? Ingestion of a mouthful of the liquid from a glow stick is considered minimally toxic, causing only minor mouth or throat irritation. If glow stick liquid is squirted into the eyes, it can cause eye injury because the eyes are more sensitive than the skin in the mouth […]
Is an example of an elements and is an example of a compound?
Is an example of an elements and is an example of a compound? Compounds are substances made from atoms of different elements joined by chemical bonds. They can only be separated by a chemical reaction. Common examples are water (H2O), salt (sodium chloride, NaCl), methane (CH4). It is possible for a molecule to be an […]
What is the theory of general relativity in simple terms?
What is the theory of general relativity in simple terms? General relativity is a theory of space and time. The central idea of general relativity is that space and time are two aspects of spacetime. Spacetime is curved when there is matter, energy, and momentum resulting in what we perceive as gravity. The links between […]
Where is phosphorus used?
Where is phosphorus used? Uses of Phosphorus Phosphorus is used in the manufacture of safety matches (red phosphorus), pyrotechnics and incendiary shells. Phosphorus is also used in steel manufacture and in the production of phosphor bronze. Phosphates are ingredients of some detergents. What happens if you eat too much phosphorus? High phosphorus levels can cause […]
What are 4 chemical energy examples?
What are 4 chemical energy examples? the energy which is stored in the bonds of chemical compounds (molecules and atoms). It is released in the chemical reaction and mostly produces heat as a by-product, known as an exothermic reaction. The examples of stored chemical energy are biomass, batteries, natural gas, petroleum, and coal. Why am […]
Are g cm3 and g mL the same?
How does the fetus attach to uterus?
How does the fetus attach to uterus? First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes. Does […]
What two organs work together?
What two organs work together? Two systems that work very closely together are our cardiovascular and respiratory systems. The cardiovascular system includes your heart and blood vessels, which function to remove deoxygenated blood from and return oxygenated blood throughout your body. Which organs work together? When groups of tissues work together, they are called organs. […]
What is the difference between a polar and nonpolar covalent bond?
What is the difference between a polar and nonpolar covalent bond? Bonds that are partly ionic are called polar covalent bonds. Nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal. The result is a bond where the electron pair is displaced toward the more […]