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Which of the following is true about compounds?
they can be physically separated into their component elements.
In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?
Which of the following is true about subatomic particles?
the mass of a neutron nearly equals the mass of a proton.
An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are...
76 protons and 76 electrons.
How many protons, electrons, and neutrons does an atom with the atomic number 50 and the mass number 125 contain?
50 protons, 50 electrons, 75 neutrons.
If E is the symbol for an element, which 2 of the following symbols represent isotopes of the same element?
E: 20-10 &
In which of the following is the number of neutrons correctly represented?
238:92; U has 146 neutrons.
In Bohr's model of the atom, where are the electrons and protons located?
the electrons move around the protons, which are at the center of the atom.
How does the energy of an electron change when the electron moves closer to the nucleus?
The quantum mechanical model of the atom...
involves the probability of finding an electron in a certain position.
The atomic number of an element is the total number of which particles in the nucleus?
protons and neutrons.
An -ate or -ite at the end of a compound name usually indicates that the compound contains..
a polyatomic anion.
Which of the following shows correctly an ion pair and the ionic compound the two ions form?
Fe3 + O2- ; Fe2O3
Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
P(s)+O2(g) ---> P2O5(s)
When the following equation is balenced, what is the coefficient for HCl? Mg(s) + Hcl(aq) --> MgCl2 (aq) + H2 (g)
What are the missing coefficients for the skeleton equation below? Al2 (SO4)3(aq) --->Al(OH)3(aq)+K2 SO4(aq)
1, 6, 2, 3
What are the correct formulas and coefficients for the products of the following double-replacement reaction? Rb Oh + H2 PO4-->
H2 Rb+PO4 OH
Which of the following statements is NOT true about double-replacement reactions?
the reactant may be a solid metal.
The complete combustion of which of the following substances produces carbon dioxide and water?
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