Answer:
B) weight
Thats it no explanation
Answer:
B) weight
Explanation:
Weight is gravity's pull on an object. This would change if you went to the moon. Gravitational
Mass is the amount of the object. This would stay the same if you went to the moon. Non-gravitational
Answer:
Second graph is more reactive.
Explanation:
I just did the lesson myself, chose the first graph, and obviously got it wrong.
Therefore I can tell you with 100% certainty that the correct answer is graph #2 in this case. Hope this helps.
sodium, nickel, carbon, or oxygen
Answer : Option A) Sodium
Explanation : Sodium is the element which is most reactive tin the given options.
Sodium has the atomic number as 11, which is distributed in the atomic shells as 2-8-1.
So, it is clear that the outermost valence shell contains only one electron in sodium. To give away one electron and attain the octet state is easy for sodium. If it donates the electron it becomes a cation which is very reactive, as it gets a positive charge on itself.
Compared to the valency of the other atoms given here, Nickel has 2 valence electrons so it will be less reactive than Sodium.
Carbon has 4 valence electrons which is less than sodium and oxygen needs 2 electrons to be an octet which is also less.
(2) Pb(CrO4)2 (4) Pb2(CrO4)3
Lead chromate and lead sulfate are found in the crystal Pb(Cr, S)O₄, which is a changeable solid mixed phase. This material is the end product of a co-precipitation reaction between lead and chrome salts (see the chapter on production and usage for further information). The correct option is 1.
Water does not dissolve lead chromate, which is produced by the double decomposition process. It is also used as a pigment and is referred to as chrome yellow. In a media that has been buffered with a solution of acetic acid and lead acetate, the lead precipitates as chrome.
There may be significant amounts of water-soluble lead compounds in lead chromate pigments. The formula that represents Lead (II) Chromate is PbCrO₄.
Thus the correct option is 1.
To know more about lead(II) chromate, visit;
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The measurement 0.025 g has two significant digits. Leading zeroes are not counted as significant.
The correct answer to the question is (b) 2. The number 0.025 g has two significant digits.
In Physics, a significant digit is any non-zero digit or any embedded or trailing zeroes in a number. Leading zeros, which are zeros at the beginning of a decimal number, are not considered significant digits. In the number 0.025 g, the leading zeros are not counted as significant because they only indicate the decimal place of the significant digits (in this case, the digits 2 and 5). Therefore, the number of significant digits is 2.
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