5.
5
19
Answer the following questions from the given table.
ELEMENT
MASS NUM...
5.
5
19
Answer the following questions from the given table.
ELEMENT
MASS NUMBER
ATOMIC
NUMBER
A
14
7
В.
9
C С
20
10
D
23
E
9
4
i) How many electrons are present in E?
ii) Which is an inert gas?
iii) Which element has valency of 3?
iv) How many neutrons are present in D?
iv) Which element will form a cation with one positive charge?
Answers: 1
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Asample of gas occupies 17 ml at –112°c. what volume does the sample occupy at 70°c a. 10.6 ml b. 27 ml c. 36 ml d. 8.0 ml you
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Chemistry, 22.06.2019 14:30
100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)
Answers: 1
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If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3
Answers: 2
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