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3 years ago

Please help me solve this USING DIMENSIONAL ANALYSIS! :

Chemistry

1 answer:

Amanda [17]3 years ago

5 0

Answer:

Explanation:

Given: 1 dietary Calorie = 1000 calories

1 calorie = 4.184 Joules

But,

1 dietary Calorie = 1 Kcalorie

= 1000 x 4.184 Joules

= 4184 Joules

= 4.184 KJoules

1 dietary Calories contains 4.184 KJ of energy.

A bottle of Coca cola contains 42 Kcalories; thus,

1 Kcalorie = 1000 calories

= 4.184 KJoules

Energy = 42 x 1 dietary Calories

= 42 x 4.184 KJoules

= 175.728 KJoules

Energy ≅ 176 KJ

So that;

In my bottle of coca cola, there are 176 KJ of energy.

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A sample of O2 gas occupies a volume of 571 mL at 26 ºC. If pressure remains constant, what would be the new volume if the tempe

Vlad1618 [11]

Answer: The new volume at different given temperatures are as follows.

(a) 109.81 mL

(b) 768.65 mL

(c) 18052.38 mL

Explanation:

Given: $V_{1}$ = 571 mL, $T_{1} = 26^{o}C$

(a) $T_{2} = 5^{o}C$

The new volume is calculated as follows.

$\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{571 mL}{26^{o}C} = \frac{V_{2}}{5^{o}C}\\V_{2} = 109.81 mL$

(b) $T_{2} = 95^{o}F$

Convert degree Fahrenheit into degree Cesius as follows.

$(1^{o}F - 32) \times \frac{5}{9} = ^{o}C\\(95^{o}F - 32) \times \frac{5}{9} = 35^{o}C$

The new volume is calculated as follows.

$\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{571 mL}{26^{o}C} = \frac{V_{2}}{35^{o}C}\\V_{2} = 768.65 mL$

(c) $T_{2} = 1095 K = (1095 - 273)^{o}C = 822^{o}C$

The new volume is calculated as follows.

$\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{571 mL}{26^{o}C} = \frac{V_{2}}{822^{o}C}\\V_{2} = 18052.38 mL$

8 0

3 years ago

How is hydrogen in heavy water different from hydrogen in normal water?

tatyana61 [14]

Answer:

I'd say the correct answer is A

Explanation:

hope this helps:)

sorry if its wrong:(

6 0

3 years ago

Evaluate each scenario to determine whether it represents a chemical reaction.

vova2212 [387]

Explanation:

A chemical reaction is one in which a chemical change occurs.

During a chemical change;

The process is irreversible
New kinds of matter produced
There is a change in mass

Based on these premise;

Baking cake batter is a chemical reaction because you cannot reverse the process

Shredding a paper is not a chemical reaction because no new kind of matter is produced.

Twisting of a metal wire is not a chemical reaction

Yellowing of newspaper in sunlight is a chemical change. The process cannot be reversed

8 0

3 years ago

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When an atom gives off energy in the form of light, a. it becomes excited. b. it becomes more stable. c. it returns to ground st

egoroff_w [7]

Answer is only B.
<span>it becomes more stable</span>

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3 years ago

If an atom has an electron configuration of 2.8.2, what will it be most likely to bond with?

Kipish [7]

Answer:

B. Two chlorine atoms

Explanation:

This electronic configuration shows that the given atom is magnesium.

Electronic configuration of magnesium:

Mg¹² = 1s² 2s² 2p⁶ 3s²

There are two valance electrons of magnesium that's why it would react with two atoms of chlorine. Chlorine is present in seventeen group. It has seven valance electrons. It required just one electron to get complete octet. While magnesium needed to lose two electrons to get complete octet. That's why two chlorine atoms bonded with one magnesium atom. Thus both would get complete octet.

Mg + Cl₂ → MgCl₂

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3 years ago