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Norma-Jean [14]

3 years ago

8

You took a can of soda out of the refrigerator. After holding the can for a minute, how does your hand feel? Explain what happen

ed to cause this. Be sure to identify the method of transfer and the direction of heat flow.
HELP I HAVE MY FINALSSSS

1 answer:

Maurinko [17]3 years ago

5 0

Answer:

You hand will most likely feel cold and your body will feel the cold ness to

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Write word and formula equations for the reaction of naoh and h3po4

ValentinkaMS [17]

3 contraints depend on moles
naoh:h3po4
1:1 nah2po4
2:1 na2hp04
3:1 na3po4

6 0

3 years ago

What does it mean if an element has 8 valence electrons? O A. It has 8 protons. O B. It has a full octet. O O O O C. It reacts v

Goshia [24]

Answer:

i belive its c

Explanation:

Atoms of group 18 elements have eight valence electrons (or two in the case of helium). These elements already have a full outer energy level, so they are very stable. As a result, they rarely if ever react with other elements. Therefore, it is very reactive and gives up electrons in chemical reactions.

4 0

3 years ago

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The element antimony has an atomic weight of 122 and consists of two stable isotopes antimony-121 and antimony-123. the isotope

grin007 [14]

Answer:- 123 amu.

Solution:- The formula to calculate the average atomic mass of an atom is:

Average atomic mass = mass of first isotope(abundance of first isotope) + mass of second isotope(abundance of second isotope)

Note: The percent abundance is converted to decimals.

mass of Sb-121 is 121 amu and it's percent abundance is 57.3% and in decimal it is 0.573. Percent abundance of Sb-123 is 42.8% and in decimal it is 0.428. We are asked to calculate it's mass. The average atomic mass of Sb is given as 122.

Let's say the mass of Sb-123 is M and plug in the values in the formula and do calculations:

122 = 121(0.573) + M(0.428)

122 = 69.333 + M(0.428)

On rearrangement:-

M(0.428) = 122 - 69.333

M(0.428) = 52.667

$M=\frac{52.667}{0.428}$

M = 123

So, the mass of Sb-123 is 123 amu.

6 0

4 years ago

50 grams of acetic acid C2H4O2 are dissolved in 200 g of water. Calculate the weight % and mole fraction of the acetic acid in t

Len [333]

$50g$ $of$ $C_2H_4O_2$ $in$ $200g$ $H_2O$

so:

$\frac{50}{200+50}+100\%= \frac{50*100}{250}\%=20\%$

$MW of acid = 2*C+4*H+2*O = 2*12+4*1+2*16=$

$=24+4+32=60g/mol$

so:

$\frac{50g}{60g/mol}\approx0.83moles$

it means that

in $50g$ of acid there is $\approx0.83$ moles of acid

$MW of H_2O = 2*H+O=2*1+16=2+16=18g/mol$

so:

$\frac{200g}{18g/mol}\approx11.11moles$

it means that:

in $200g$ of water there is $\approx11.11$ moles of water

therefore:

$\frac{0.83mol}{11.11mol+0.83mol}= \frac{0.83mol}{11.94mol}=0.069$

So your answers are:

$20\%$

and the mole fraction is:

$0.069$

6 0

3 years ago

Which sentence describes two atoms that form a covalent bond?

marin [14]

Answer: A. The electronegativity of one atom is less than 1.7

8 0

3 years ago