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mario62 [17]
4 years ago
10

Why aren't alkali metals found in pure form?

Chemistry
1 answer:
Llana [10]4 years ago
6 0
It mostly because they're so reactive and if they were in their pure form and touched water they would have a very violent reaction. They also want to be more stable so they look for more electrons and quickly bond.
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The specific heat of palladium is 0.239 J/g°C. How much heat (q) is released when a 10.0 g piece of platinum cools from 100.0°C
Andrej [43]

Answer:

119.5 J

Explanation:

First we <u>calculate the temperature difference</u>:

  • ΔT = 100 °C - 50 °C = 50 °C

Then we can <u>calculate the heat released</u> by using the following formula:

  • q = Cp * ΔT * m

Where q is the heat, Cp is the specific heat, ΔT is the temperature difference and m is the mass.

We <u>input the data</u>:

  • q = 0.239 J/g°C * 50 °C * 10.0 g
  • q = 119.5 J
7 0
3 years ago
What kind of chemical bond is an insulator most likely to have? A. covalent bonds B. ionic bonds C. hydrogen bonds D. metallic b
mars1129 [50]

Answer is:  A. covalent bonds.

Insulator most likely has covalent bonds, because it must have low electrical conductivity.

1) Substances with covalent bond not conduct an electric current in liquid and solid state, because they not have free ions or electrons.  

2) Substances with ionic bond conduct an electric current in liquid, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.

3) Substances with metallic bond conduct an electric current in liquid and solid state, because they have mobile electrons.

8 0
3 years ago
Read 2 more answers
Which of the following atoms has the largest atomic radius? Provide an explanation
trapecia [35]

Answer:

d Rubidium

Explanation:

The atomic radius of an atom is the distance from the center of the nucleus to its outermost electron.

The atomic radius of elements varies in the periodic table, it increases as you go down in a group and decreases along the period from left to right.  

All the elements listed: Hydrogen, Sodium, Lithium and Rubidium belong to the same group in the periodic table (group 1), Since atomic radius increases from top to bottom in a group, Rubidium has the largest atomic radius.

4 0
3 years ago
How many moles of oxygen are needed for the complete combustion of 12.6 moles of acetylene?
soldi70 [24.7K]

The moles of oxygen required to completely react with 1-mole acetylene is 2.5 mol.

The moles of reactant and product in a chemical reaction to the whole number ratio is given by the stoichiometric coefficient of the balanced chemical equation.

8 0
3 years ago
If i have about 68.2 grams of H2S, how many moles do i have?
natita [175]

Answer:

2.1 mol

Explanation:

68.1g / 34.1 g/mol = 2.1mol

6 0
4 years ago
Read 2 more answers
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