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Alina [70]
4 years ago
10

If the unknown elements on the periodic table are "unknown" how did they end up in the periodic table in the first place? *think

ing emoji face*
Chemistry
1 answer:
mezya [45]4 years ago
8 0

Answer:

The periodic table is a marvel of organization, with each column and each row showing all ... Scientists identified the rest of them in the first half of the 20th century. ... They created in their lab a synthetic, previously unknown element. ... The Berkeley scientists did this for weeks on end, and produced a tiny amount of curium.

Explanation:

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Which of the following elements is in the same family as fluorine?
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Answer:

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Explanation:

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What is the molarity of a solution prepared by dissolving 2.5 grams of LiNO3 in sufficient water to make 60.0 mL of solution?​
Murrr4er [49]

Answer: hope this helps

To make molar NaCl solutions of other concentrations dilute the mass of salt to 1000ml of solution as follows:

0.1M NaCl solution requires 0.1 x 58.44 g of NaCl = 5.844g.

0.5M NaCl solution requires 0.5 x 58.44 g of NaCl = 29.22g.

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Explanation:

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Classify the chemical reaction shown here:
lesantik [10]

Answer:

Single-Replacement Reaction

General Formulas and Concepts:

<u>Chemistry - Reactions</u>

  • Synthesis Reactions: A + B → AB
  • Decomposition Reactions: AB → A + B
  • Single-Replacement Reactions: A + BC → AB + C
  • Double-Replacement Reactions: AB + CD → AD + BC

Explanation:

<u>Step 1: Define RxN</u>

Mg + H₂SO₄ → MgSO₄ + H₂

<u>Step 2: Identify RxN</u>

Mg + H₂SO₄ → MgSO₄ + H₂

Single-Replacement Reaction A + BC → AB + C

  • A = Mg
  • BC = H₂SO₄
  • AB = MgSO₄
  • C = H₂
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3 years ago
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