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3 years ago

Which values are written in proper scientific notation? Check all that apply.

Chemistry

2 answers:

Korolek [52]3 years ago

7 0

3.50 × 10–4 is written in proper scientific notation

evablogger [386]3 years ago

4 0

The answers are numbers 3, 5 and 6

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Naming covalent CH4 + 20. CO₂ + 2H₂O

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3 years ago

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

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4 years ago

Why are cleaning compounds often bases?

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