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2 years ago

Science need ko po ng help di mo ako kase matalino salamat po

Chemistry

1 answer:

Lorico [155]2 years ago

6 0

Answer:

1.An initial observation is the measurement that you take before you start any process that might cause a change. When you compare your subsequent observations with the initial one, you will see whether any change has taken place, and you will be able to measure the change.

Explanation:

D ko po alam yung iba

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Which statements correctly describe light? (Select all that apply.)

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1 year ago

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The chemical reaction that breaks the bonds between chains of monomers is called?

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Hydrolysis ! is the answer to your question!

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2 years ago

Copper(II) nitrate forms a series of hydrates with the formula Cu(NO3)2.xH2O. These hydrates decompose to form copper(II) oxide.

maria [59]

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One mole is defined as the amount of substance containing as many elementary entities (atoms, molecules, ions, electrons, radicals, etc.) as there are atoms in 12 grams of carbon-12 (6.023 x 1023). The mass of one mole of a substance equals its relative molecular mass expressed in grams. Also spelled as mol.

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2 years ago

How is molarity affected if some solution splashes out of the flask during titration?

Annette [7]

<span>If you used more water, the molarity would go down since molarity is moles/liter, and the opposite if you used more water.

If the acid absorbed water, the molarity would go down because the absorbed moisture will skew the weight of the acid up.

That would make the molarity go down since there would have been unreacted acid in the spilled liquid.</span>

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

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2 years ago

Give the number of protons and the number of neutrons in the nucleus of each ofthe following isotopes: (a) Aluminum-25 (b) Techn

NeTakaya

Answer:(a)Aluminium-Al has 12 protons and 13neutrons (b) Technetium-Tc has 43 protons and 52neutrons (c) Tin-Sn has 50protons and 70 neutrons (d) Mercury - Hg has 80protons and 120neutrons

Explanation:

All elements on the periodic table are are arranged in terms of atomic number.

For a neutral atom( uncharged atom) , atomic number is the same as proton number. And the sum of number of proton and number of neutrons gives mass number.

Isotopes exist as a result of difference in mass number of atoms but the same atomic number, which implies isotopes of an element always have the same number of protons but different neutron numbers.

(a) Aluminum-25 has a mass number of 25 with atomic number of 12.

Since its a neutral atom, number of protons is 12 while neutron number can be deduced as,

Mass number = neutron number+ proton number

Neutron numbers= mass number - proton number

Neutron number= 25-12=13neutrons

(b) Technetium -95 has a mass number of 95 with atomic number of 43.

Since its a neutral atom, number of protons is 12 while neutron number can be deduced as,

Mass number = neutron number+ proton number

Neutron numbers= mass number - proton number

Neutron number= 95-43=52neutrons

Since its a neutral atom, number of protons is 50 while neutron number can be deduced as,

Mass number = neutron number+ proton number

Neutron numbers= mass number - proton number

Neutron number= 120-50=70neutrons

(d) Mecury-200 has a mass number of 200 with atomic number of 80.

Since its a neutral atom, number of protons is 80 while neutron number can be deduced as,

Mass number = neutron number+ proton number

Neutron numbers= mass number - proton number

Neutron number= 200-80=120neutrons

7 0

3 years ago