We may have many differences among us; different classes, beliefs, countries, occupations, and even tastes, but one thing that all of us have in common is our microscopic blueprint… we are all made of atoms. This isn’t just shared among fellow humans; rather, it is the case for every...
Atoms (原子) are all around us. They are the bricks of which everything is made. Millions of atoms are held in just one grain of salt, but in spite of their small size they are very important. The way an everyday object acts depends on what kind of atoms are...
Water is made up of two elements, hydrogen and oxygen. How many hydrogen atoms are there in one molecule of water? A. One B. Two C. Three D. Four 相关知识点: 试题来源: 解析 B。解析:一个水分子的化学式是H₂O,这表示一个水分子由两个氢原子和一个氧原子组成,所以答案是B。A选项一...
61. When did scientists come to realize how the atoms and molecules on the Earth combined to make living thing? A. 4 billion years ago. B.1953. C. After seven days.D. Many years later. 62. Scientists figured out that human bodies are basically made of . ...
Red is the lowest-energy visible light, so in a red-hot object the atoms are just getting enough energy to begin emitting light that we can see. Once you apply enough heat to cause white light, you are energizing so many different electrons in so many different ways that all of the ...
These researchers feel that intelligence is a combination of many factors. One theory that tries to provide a more complete view of intelligence is Howard Gardner's theory of multiple intelligences (MI). According to Gardner, there are seven types of intelligence: Linguistic Logical-mathematic ...
Whether or not they have wings, some insects might get the chance to fly if selected to go in space and become part of the space-farming research. Though many plant parts are inedible for humans, they make a delicious meal for insects. Insects can convert much of this inedible material in...
Evolution of the Periodic Table When Mendeleev first published the original periodic table in 1869, it contained only 63 elements — about half as many as there are today. His table had gaps to leave room for elements that had not been yet discovered, and Mendeleevused the position of these...
Atom smashers, like CERN, are large tunnels lined with powerful supermagnets that circle around to propel atoms at near-light speeds. When an atom is sent through this accelerator, it slams into a target, creating particles. Some of these particles are antiparticles that are separated out by ...
That's compared to hundreds of billions of gallons of tap water, but it's still an impressive market share for a product costing 10,000 times more than its municipal counterpart. How many bottles do we drink a year? Let’s start with how many bottles of water are in a gallon. ...