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Chemistry, 22.06.2019 03:00
Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture
Answers: 1
Chemistry, 22.06.2019 10:00
3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?
Answers: 2
Chemistry, 22.06.2019 17:40
Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.
Answers: 1
Chemistry, 23.06.2019 01:30
Which statement accurately represents the arrangement of electrons in bohr’s atomic model?
Answers: 2
How elements are arranged in the groups of periodic table...
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