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Pachacha [2.7K]
2 years ago
11

Someone explain it plz ​

Chemistry
2 answers:
KIM [24]2 years ago
4 0
  • Two hydroxide ions means two OH^- ions .
  • The valency of reactants must be 2

Only possible with alkaline earth metals

Let's see an example

\\ \sf\longmapsto X(OH)_2

  • X belongs to group || i.e alkaline earth metals

The elements are

  • Magnesium (Mg)
  • Calcium (Ca)
  • Beryllium(Be)
  • Scandium(Sc)
  • Barium (Ba)
  • Renedium (Rn)

Option C is correct

docker41 [41]2 years ago
3 0

\rule{300pt}{1000000pt}

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Ik im not right.. or am i?
bearhunter [10]

Answer:

The correct answer is option C

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Explanation:

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What is the percent composition by mass of oxygen in ca(no3)2 (gram-formula mass = 164 g/mol)?a.9.8%b.29%c.48%d.59%?
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8 0
3 years ago
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The goose has a mass of 19.2 lb (pounds) and is flying at 7.10 miles/h (miles per hour). What is the kinetic energy of the goose
nata0808 [166]

Answer:

43.868 J

Explanation:

Kinetic energy of a body is the amount of energy possessed by a moving body. The SI unit of kinetic energy is the joule (kg⋅m²⋅s⁻²).

According to classical mechanics, kinetic energy = 1/2 m·v²

Where, m= mass in kg and v= velocity in m/s

Given: m = 19.2 lb and v = 7.10 miles/h

Since, 1 lb= 0.453592 kg

∴ m = 19.2 lb = 19.2 × 0.453592 kg = 8.709 kg

Also, 1 mi = 1609.34 m and 1 h = 3600 sec

∴ v = 7.10 mi/h = 7.10 × 1609.34 m ÷ 3600 sec = 3.174 m/sec

Therefore, <u>kinetic energy of the goose</u> = 1/2 m·v² = 1/2 × (8.709 kg)× (3.174 m/sec)² = 43.868 J

5 0
2 years ago
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