4 years ago

ANSWER CORRECTLY FOR BRAINLY, 3 QUESTIONS

Chemistry

1 answer:

uysha [10]4 years ago

7 0

Answer:

2 up and to the right

Explanation:

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The mass number of 3 isotopes of magnesium are 24,25,26.what is the mass number of the most abundant isotope of magnesium.

Anarel [89]

Answer:

24.4 amu or g/mole

Explanation:

24 x 0.790 = 19.0 amu

25 x 0.100 = 2.50 amu

26 x 0.110 = 2.86 amu

(Because of the 19.0, the sig figs go only to the 1/10 decimal place)

19.0 + 2.5 + 2.9 = 24.4 amu or g/mole

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3 years ago

Which of phase changes requires an input of energy

Reika [66]

Melting requires an input of energy to convert a solid to a liquid.

Hope this helped!

Good luck :p

Brainliest is always appreciated :)

~ Emmy

4 0

3 years ago

Solid magnesium reacts with aqueous Iron(III) chloride to produce aqueous magnesium chloride and solid iron.

luda_lava [24]

Answer:

9÷2Mg2+2FeCl3 =3Mg3Cl2 +2Fe

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4 years ago

Which of these acids occurs naturally in the body and performs important regulatory functions? carbonic acid acetic acid magnesi

Svetach [21]

Answer: Carbonic acid occurs naturally in the body and performs important regulatory functions.

Explanation: Carbonic acid ( $H_2CO_3$ ) is an acid formed from the carbon dioxide present in the body. It is also known as the respiratory acid as it helps in the transport of carbon dioxide in the body.

With the help of enzyme Carbonic Anhydrase, carbon dioxide is converted into carbonic acid. This acid is an unstable intermediate which gets dissociated into bicarbonate ions ( $HCO_3^-$ ) and $H^+$ ions. immediatley.