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notsponge [240]
3 years ago
15

Explain why silicon dioxide does not conduct electricity.​

Chemistry
1 answer:
slamgirl [31]3 years ago
6 0

Answer:

Explanation:

Silicon dioxide doesn't have any mobile electrons or ions - so it doesn't conduct electricity either as a solid or a liquid.

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An aluminium kettle weighs 1.05 Kg.
Kipish [7]

Answer:Explained

Explanation:

Given

mass of aluminium kettle(m_k)=1.05 kg

(a)Heat capacity of the kettle=Heat capacity of Aluminium

C_{Al}=0.9 J/gm-K

(b)Heat is required to increase the temperature of this kettle from 23^{\circ} to 99 ^{\circ}

Q=m_kc_k\Delta T

Q=1.05\times 0.9\times 1000\times \left ( 99-23\right )

Q=71.82 kJ

(c)If kettle contains water 1.25 L of water i.e. 1.246 kg of water then heat required to raise the temperature from 23 to 99

Q=m_kc_k\left ( \Delta T\right )+m_wc_w\left ( \Delta T\right )

Q=1.05\times 0.9\times 1000\times \left ( 99-23\right )+1.246\times 4.184\times 1000\times \left ( 99-23\right )

Q=71.82+396.20=468.028 kJ

7 0
4 years ago
If a sample weighs 3500 mg, it is equivalent to : A) 35g B)0.0035kg C)3.5kg D)350g
Stels [109]
B) 0.0035 kg Hope this helps!
3 0
3 years ago
How many protons (p) and neutrons (n) are in an atom of sr? 38 p, 90 n 90 p, 38 n 38 p, 52 n 52 p, 38 n?
harina [27]
Sr will always have 38 protons because that is its atomic number. Normally Sr has 38 protons and 49 neutrons yielding an atomic mass of 87. unless you are dealing with an isotope of Strontium in which 3 additional neutrons would give you the 53 neutrons in your answer, (38p, 52n).
3 0
4 years ago
Hydrogen fluoride is used:
Simora [160]

Answer: The correct answer is option B)

in the synthesis of cryolite for aluminum production.

Explanation:

Hydrogen fluoride (HF) is used in synthesis of cryolite for aluminum production.

HF is a gas that dissolves in water to form hydrofluoric acid. However, HF also react with halogenated alkanes like trichloromethane CHCl3 to form organofluorine compounds that serves as precursors in the synthesis of cryolite, an Ore from which aluminum is produced

6 0
3 years ago
How many moles of aluminum is needed to react with 6.34 moles of Fe​3​O​4​ in the reaction below?
OLEGan [10]

Answer:

16.9 mol

Explanation:

8Al + 3Fe₃O₄ ⟶ 4Al₂O₃ + 9Fe

You want to convert moles of Fe₃O₄ to moles of Al.

The molar ratio is 8 mol Al:3 mol Fe₃O₄.     Calculate the moles of Al

Moles of Al = 6.34 × 8/3

Moles of Al = 6.34 × 2.667

Moles of Al = 16.9 mol Al

6 0
4 years ago
Read 2 more answers
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