What are the characteristics of Group 4 elements? They have a high affinity for oxygen. They mainly have +4 oxidation state which is mainly due to the loss of all four ns2(n − 1)d2 valence electrons. The group 4 elements become denser, higher melting, and more electropositive as we move down the column in the […]
Who was the first person to describe a reflex?
Who was the first person to describe a reflex? René Descartes Did Socrates believe knowledge is born with us? Answer Expert Verified Socrates believed that c) knowledge grows from experience. He is the person known for the quote “I know that I know nothing” and believed that wrongdoings and non-virtuous behavior came from people being […]
Why does pressure increase when volume decreases?
Why does pressure increase when volume decreases? Decreasing the volume of a gas increases the pressure of the gas. Because the volume has decreased, the particles will collide more frequently with the walls of the container. Each time they collide with the walls they exert a force on them. More collisions mean more force, so […]
What is a example of contraction?
What is a example of contraction? A contraction is a word made by shortening and combining two words. Words like can’t (can + not), don’t (do + not), and I’ve (I + have) are all contractions. People use contractions in both speaking and writing. What is the difference between thermal expansion and contraction? Thermal expansion […]
How do unicellular organisms move?
How do unicellular organisms move? Unicellular organisms can move in two distinct ways—movement and locomotion. Movement enables an organism to change its form or shape. Unicellular organisms achieve locomotion using cilia and flagella. By creating currents in the surrounding environment, cilia and flagella can move the cell in one direction or another. How long can […]
Is black a good reflector of radiation?
Is black a good reflector of radiation? The amount of energy absorbed and radiated is decided by the colour. White is a good reflector while black is a good absorber of heat. Among other colours there is a gradation of temperature. Why is a good emitter a good absorber? Prior to Kirchhoff’s studies, it was […]
How do hydrothermal vents form?
How do hydrothermal vents form? Hydrothermal vents are the result of seawater percolating down through fissures in the ocean crust in the vicinity of spreading centers or subduction zones (places on Earth where two tectonic plates move away or towards one another). The cold seawater is heated by hot magma and reemerges to form the […]
Are Hot Springs dangerous?
Are Hot Springs dangerous? Hot-spring water is usually fairly safe from the standpoint of carrying disease-causing organisms, but some is not (see below under “Stay healthy”), and the surface water that cools a scalding spring to usable temperatures will be prone to the same bugs and pathogens as any other surface water. Why do hot […]
What determines the rate at which energy is delivered by a current?
What determines the rate at which energy is delivered by a current? Answer: The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which energy is delivered by a current is the power of the appliance. How do you calculate appliance consumption? Once you have those […]
Does sunlight through glass help with SAD?
Does sunlight through glass help with SAD? Even if you don’t develop SAD, increasing your exposure to natural light is a great way to reduce your stress levels. Because sunlight helps to regulate sleep and production of chemicals like melatonin and serotonin, it can also help decrease your body’s stress levels. Does vitamin D go […]