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suter [353]
3 years ago
12

Which of the following statements is true?

Chemistry
2 answers:
VikaD [51]3 years ago
8 0

Elements are substances made of only one type of atom is true,

stepladder [879]3 years ago
5 0

Answer:

Elements are substances made of only one type of atom

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In the world of chemistry, a 'mole' is a number of something... a very large number of something.
valkas [14]
Mole is equal to 6.02*10^23 atoms, and you have 7.00*10^23 atoms
3 0
3 years ago
Describe the properties of alkali metals. Based on their electronic arrangement, explain whether they exist alone in nature.
bearhunter [10]

Answer:

- They are highly reactive metals

- They have low electro negativity

- They have low ionization energy

- They don't exist alone in nature

- They have low densities

Explanation:

Alkali metals are the elements in group 1 of the periodic table. They include Sodium, Lithium, Potassium e.t.c.

Due to the fact they have one atom in their outermost shell, they are very unstable because they easily react with other elements and are therefore don't exist alone in nature but combined with other elements for this same reason.

Since alkali metals don't easily attract other elements due to it's lone pair in the outer most shell, it can be said to have low electro negativity.

Also, they don't need energy to discharge their electrons since they are highly reactive due to their lone pair in the outermost shell and so we say they have low ionization energy.

Due to this reason, they also have low densities.

7 0
2 years ago
Which of the following molecules contains a covalent bond? (Use the electronegativity values from the periodic table to help you
AysviL [449]

Answer:

It’s B - CO

Explanation:

3 0
2 years ago
What kind of reaction is AgNO3+KI —> AgI+KNO3?
Scilla [17]

Answer:

Substitution reaction

5 0
3 years ago
If a buffer solution is 0.130 M in a weak acid (K_a = 1.7 x 10^-5) and 0.590 M in its conjugate base, what is the pH?
Serggg [28]
Use the Henderson-Hasselbach equation:
pH = pKa + log[base]/[acid]
pH = -log(1.7 x 10^-5) + log(0.590/0.130) = 5.43
8 0
3 years ago
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