第1题 The two elements water is made are oxygen and hydrogen.A、that B、which C、of which D、with which 第2题 The crime was discovered till 48 hours later,gave the criminal plenty of time to get away.A、which B、that C、so D、what 第3题 The International Studies University,in 1951...
You probably know the element oxygen. It is the element that we b___in all the time. And elements can combine (结合) to make new things l___H2O. This is hydrogen and oxygen put together, also known as w___! Learning about these things helps us better understand the world we live ...
What are the elements that make up Group 18 in the periodic table? What is the collective term for them? Which three elements are likely to have similar chemical and physical properties? - boron, silicon, and germanium. - sodium, magnesium, and aluminum. - carbon, nitrogen, and oxygen. -...
Organic compounds are compounds that contain carbon in their structures. There a lot of organic compounds present in nature due to the versatility of carbon to form bonds with itself and with other elements. It can form bonds with hydrogen, oxygen, nitrogen, sulfur, etc.Answer an...
A substance which cannot be decomposed into different kinds of matter by any means at present employed; as, the elements of water are oxygen and hydrogen. Element One of the ultimate parts which are variously combined in anything; as, letters are the elements of written language; hence, also...
It does not easily corrode, which means that it doesn't break down easily when exposed to oxygen or water. This means that it can be used to make many useful objects because we don't have to worry that it will need to be replaced frequently. Zirconium pieces Because of this, ...
In order to make it from the elements, you need a chemical reaction, so then the elements are no longer elements (but the oxygen is still an oxygen). The confusion comes from the first part of the definition: An element is a species of atoms. We call those atoms that have 8 proto...
A chemistry major explores the complex ways the elements on the periodic table combine. Those elements can produce table salt, a combination of sodium and chloride, water, a combination of hydrogen and oxygen, and myriad other, more complicated compounds. In classroom- and laboratory-based coursewo...
When you think about what elements are needed to stay alive, oxygen probably comes to mind first. But oxygen can’t sustain life all on its own. Blood carries the oxygen from our lungs to other areas of our body.1 Delivering nutrients From the protein-packed dinner you just had to ...
Why is hydrogen important as a future clean energy source? A fuel is a chemical that can be ‘burnt’ to provide useful energy. Burning normally means that chemical bonds between the elements in the fuel are broken and the elements chemically combine with oxygen (often from the air). ...