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jeyben [28]
2 years ago
9

What is the pattern of valence numbers on the periodic table?

Chemistry
1 answer:
const2013 [10]2 years ago
7 0

Answer:

In general, the number of valence electrons is the same within a column and increases from left to right within a row. Group 1 elements have just one valence electron and group 18 elements have eight, except for helium, which has only two electrons total.

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Carlos Santana is a popular Latin-rock and jazz musician. O True ○ False
Sauron [17]

Answer:

True

Explanation:

Carlos Santana

Carlos Santana is a famous <u>american - mexico musician</u> and even a guitarist  with some unique music categories like , jazz , Latin , salsa . He started off in late late 1960's with the brand name Santana , which consists of a fusion of rock and roll and even Latin American jazz . And then after his career grows and he became famous .

Hence , the statement is correct .

4 0
3 years ago
How much heat energy is required to boil 66.7 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.
pochemuha

Answer:

91.7 kJ

Explanation:

Step 1: Given data

  • Mass of ammonia (m): 66.7 g
  • Molar heat of vaporization of ammonia (ΔH°vap): 23.4 kJ/mol

Step 2: Calculate the moles (n) corresponding to 66.7 g of ammonia

The molar mass of ammonia is 17.03 g/mol.

66.7 g × 1 mol/17.03 g = 3.92 mol

Step 3: Calculate the heat (Q) required to boil 3.92 moles of ammonia

We will use the following expression.

Q = ΔH°vap × n

Q = 23.4 kJ/mol × 3.92 mol = 91.7 kJ

6 0
2 years ago
If you are given 1.709 moles of solute, and you dilute it to make 2.10 liters of solution, what is the resulting molarity (M)? (
azamat
Moles/MxL 

1.709moles/2.10L =<span>0.814M</span>
4 0
3 years ago
Explain how materials are classified on the basis of electrical conductivity. Give two uses of these materials in day to day lif
vitfil [10]

Answer: On the basis of electrical conductivity, materials are classified as conductors, semi-conductors and non-conductors. Conductors : Substances through which electricity can easily pass through are known as conductors. ... For example, glass, wood are non-conductors. Wood is used to make tables, desks etc.

3 0
2 years ago
A pet owner dropped some new fish into a pond. Several species of fish lived in the pond, but within a few months, only members
Daniel [21]

Answer: the correct answer is : too many fish caused an imbalance in the ecosystem, so the food web was affected.

Explanation:

8 0
3 years ago
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