6) Most infuriatingly, many of the decision-makers in the US Department of Defense are friends with the leadership of ULA, and ULA is a common place for DoD officials to work when they retire from government. So ULA is more likely to get a nod and a wink from the DoD than an audit...
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2H2O 4 2 How many hydrogen atoms are present? How many oxygen atoms are present? 2 The easiest way to count atoms: 1. Write down all of the symbols for all of the elements present in the formula 2. If there is a coefficient, write this number next to each of the symbols 3. Multi...
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A nucleus of each chemical element consists of protons, neutrons and electrons. The mass number of an element refers to the sum of the number of protons and neutrons. However, the majority of elements exists as isotopes. Isotopes have the same number of protons but they vary in the numbers...
Earth is made up of many elements that are a product of when the planet's atmosphere was first created billions of years ago. One of these elements is hydrogen, which is one of the least abundant elements on the planet. Hydrogen
H2O(l) ?H = -285.5 kJ c. C2H2(g) + 5O2(g) ? 4CO2(g) + 2H Consider the following reaction: 2Mg(s) + O2(g) to 2MgO(s); Delta H = -1204 kJ. a) Is this reaction endothermic or exothermic? b) How many grams of MgO are produced during an enthalpy change of -96.0 kJ?
How many unpaired electrons are present in the ground state of O+ ion? How many of the following elements have 2 unpaired electrons in the ground state: C, O, Ti, Si. a) 1 b) 3 c) 4 d) 2 Determine the number of unpaired electrons in the foll...
how should elements be colored? and how many bonds does an atom have? ask question asked 11 years, 1 month ago modified 7 years, 2 months ago viewed 1k times 15 i'm working on my own 3d molecule viewer for my ap chem class. so far everything's going together ni...
Elements are all around us. Iron is one of the commonest elements found within the Earth. 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, als...