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3 years ago

Please help!!!! Best answer will get brainliest

Chemistry

1 answer:

Margarita [4]3 years ago

3 0

Answer:

covalent network

Explanation:

trust me on this one

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If 2g of an isotope has a half life of 7days,the half life of 1g of sample will be?

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7 days i think. but not sure about this answer.

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3 years ago

What is the identity of the element with the electron configuration of

Nataly [62]

Zinc

Explanation:

Electron configuration:

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²

To decipher this atom, we must understand what each of the letters and number represents;

1s²

1 is the principal quantum number

s is the azimuthal number or the subshell

2 superscript is the number of electrons

Using the number of electrons, we can deduced the atom:

2+2+6+2+6+10+2 = 30 electrons

The element with 30 electrons on the periodic table is Zinc

Learn more:

Periodic table brainly.com/question/1704778

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2 years ago

A 62.6-gram piece of heated limestone is placed into 75.0 grams of water at 23.1°C. The limestone and the water come to a final

alekssr [168]

Answer:

208.7°C was the initial temperature of the limestone.

Explanation:

Heat lost by limestone will be equal to heat gained by the water

$-Q_1=Q_2$

Mass of limestone = $m_1=62.6 g$

Specific heat capacity of limestone = $c_1=0.921 J/g^oC$

Initial temperature of the limestone = $T_1=?$

Final temperature = $T_2$ =T = 51.9°C

$Q_1=m_1c_1\times (T-T_1)$

Mass of water= $m_2=75.0 g$

Specific heat capacity of water= $c_2=4.186 J/g^oC$

Initial temperature of the water = $T_3=23.1^oC$

Final temperature of water = $T_2$ =T = 51.9°C

$Q_2=m_2c_2\times (T-T_3)$

$-Q_1=Q_2$

$-(m_1c_1\times (T-T_1))=m_2c_2\times (T-T_3)$

On substituting all values:

$-(62.6 g\times 0.921 J/g^oC\times (51.9^oC-T_1))=75.0 g\times 4.186 J/g^oC\times (51.9^oC-23.1^oC)$

$T_1=208.7^oC$

208.7°C was the initial temperature of the limestone.

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2 years ago

How many moles are equal to 89.23 g of calcium nitrate?

DanielleElmas [232]

Answer:

Explanation:

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