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12345 [234]
4 years ago
8

When Dimitri Mendelev first developed the periodic table, one of the most important features that he introduced was starting a n

ew row at a certain point. What factor was most important to Mendelev in knowing when to end a row (period) and start a new one? A) The reactivity of the elements changed drastically. B) The state of the elements went from solid to liquid. C) The boiling point of the elements decreased dramatically. D) The size of the elements jumped from very large to very small.
Chemistry
2 answers:
sashaice [31]4 years ago
6 0

Answer:

A

Explanation:

Phantasy [73]4 years ago
3 0

At the end of a period we get an inert gas which is  very unreactive compared with the previous element ( a halogen).

The answer is A.

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Every morning, Jeremiah uses a blender to make a smoothie for breakfast. Which of the
Studentka2010 [4]

Answer:

D

Explanation:

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3 years ago
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What is the molarity of a 250.0 milliliter aqueous solution of sodium hydroxide that contains 15.5 grams of solute? 6.2 M
Alchen [17]
Moles = 15.5 g / 40 g/mol = 0.3875 mol

M = 0.3875 mol / 0.250 L = 1.55M
8 0
4 years ago
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Calculate the total energy, in kilojoules, that is needed to turn a 46 g block
neonofarm [45]

Answer: The total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.

Explanation:

Given: Mass = 46 g

Initial temperature = -25^{o}C

Final temperature = 100^{o}C

Specific heat capacity of ice = 2.05 J/g^{o}C

Formula used to calculate the energy is as follows.

q = m \times C \times (T_{2} - T_{1})

where,

q = heat energy

m = mass

C = specific heat capacity

T_{1} = initial temperature

T_{2} = final temperature

Substitute the values into above formula as follows.

q = m \times C \times (T_{2} - T_{1})\\= 46 g \times 2.05 J/g^{o}C \times (100 - (-25))^{o}C\\= 11787.5 J (1 J = 0.001 kJ)\\= 11.787 kJ

Thus, we can conclude that the total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C is 11.787 kJ.

7 0
3 years ago
If 0.5 moles of Aluminum react, how many grams of Aluminum Oxide are produced?
Marysya12 [62]

Answer:

210438+28+5+8+2+2+8+30+5+8+6+8+2+5+3+82+8+9+2+8+8+5+5+5+6+9+2+56+5+6+5+-3+8+8+58+5+6+8+5+8+5+35+6+3+8+5+3+68+6+8+6+88+8+!?=8+5+55+5+5+5+5+5+5+5+5+5+2+58+0+80=0=0=00=

3 0
3 years ago
3. The dry air in the Alps helped to prevent damage to the cells in the Iceman's body.
Sever21 [200]

Answer:

False

Explanation:

because they do not prevent damage they make damage

3 0
3 years ago
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