Chemistry, 12.10.2020 20:01 bonetanne7171
Click the blue words to correct the following statements.
Atoms are tiny pieces of matter that make up all the substances around you. All
atoms contain one or more positively charged particles called electrons, which are
found in an atom's nucleus. In many atoms, the nucleus also contains neutrons,
which have a positive electrical charge. There are also small, negatively charged
particles called protons found inside the nucleus. Together, these three types of
particles make up the structure of atoms.
When two atoms have the same atomic number, they have the same number of
neutrons, and they are are classified as the same chemical element. All known
chemical elements are arranged by atomic symbol in the periodic table. The
periodic table contains information about each element, often including a short
version of the element's full name called its atomic symbol.
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Chemistry, 21.06.2019 22:30
Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?
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Chemistry, 22.06.2019 14:00
The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.
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Where are the noble gases located in the periodic table? a. in the center b. on the left side c. in the upper right corner d. on the far right side
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Click the blue words to correct the following statements.
Atoms are tiny pieces of matter that make...
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