Answer:
1.8g/cm³
Explanation:
Density is defined as the ratio of the mass of a substance and the space this subtance occupies. It is usually given in g/cm³.
The mass of the block is 30g.
The volume this mass occupies is 1.5cm × 4.8cm × 2.3cm = 16.56cm³.
The density is:
30g / 16.56cm³ =
<h3>1.8g/cm³</h3>
The <span>ion that is formed by providing the second ionization to remove an electron is </span><span>N3-. The answer is letter B. The rest of the choices do not answer the question above.</span>
Answer:
x=1.4*10^9
or choice a
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Answer:
49.3% 81Br and 50.7% 79Br or 
81Br and 
79BR
Step-by-step explanation:
To get the fraction-of-occurrences of the isotopes we must write the following equation. x is the isotopic abundance of 81Br, we can use 1 - x to get the isotopic abundance of 79Br.
(78.918)(1 - x) + (80.916)(x) = 79.903
78.918 - 78.918x + 80.916x = 79.903
1.998x = 0.985
x = 0.493
0.493 × 100 = 49.3% 81Br
100 - 49.3 = 50.7% 79Br
49.3% 81Br and 50.7% 79Br or 81Br and 79BR
Answer:
The answer is B.
Explanation:
First of all, you can rule out options A and C because they are talking about covalent bonds. The cohesive property of water is given by intermolecular interactions, and covalent bonds are intramolecular (covalent bonds are the type of bonds that hold the atoms of a molecule together).
Now, you are left with options B and D. But option D is talking about bonds with different types of molecules, not with water. It is true that water can form hydrogen bonds with other molecules, but this property has nothing to do with its cohesivity. Cohesion is, by definition, the attraction of molecules of the same type. This leaves us with option B, which is talking about intermolecular interactions between water molecules, so this one is the only correct option.
