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3 years ago

Why is the puddle underneath a melting ice cube as cold as the ice cube itself

Chemistry

2 answers:

neonofarm [45]3 years ago

5 0

It's not, if it were it would be ice. The water is a bit warmer.

Juli2301 [7.4K]3 years ago

3 0

Because the electrons in a solid, in this case the ice, are only vibrating. And so when it heats up, the electrons vibrate more. Imagine a scale from 1 to 150, 1 to 50 is a solid, 50 to 100 is a liquid, and 100 to 150 is a gas. If the ice has just been melted, then the electrons are only just in the beginning stages of moving enough to be a liquid, and the movement of electrons determines the temperature because it creates energy. I hope this was the answer you were looking for, let me know if I confused you

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How are subatomic particles measured?

DiKsa [7]

subatomic particles are measured using amu (atomic mass unit)

hope this helps!

have a great day :)

7 0

3 years ago

3.5g of a Certain compound X, known to be made of carbon, hydrogen, and perhaps oxygen, and to have a molecular molar mass of 15

shutvik [7]

Answer:

C₅H₁₀O₅

Explanation:

1. Calculate the mass of each element in 2.78 mg of X.

(a) Mass of C

$\text{Mass of C} = \text{5.13 g CO}_{2}\times \dfrac{\text{12.01 g C}}{\text{44.01 g }\text{CO}_{2}}= \text{1.400 g C}$

(b) Mass of H

$\text{Mass of H} = \text{2.10 g H$_{2}$O}\times \dfrac{\text{2.016 g H}}{\text{18.02 g H$_{2}$O}} = \text{0.2349 g H}$

(c) Mass of O

Mass of O = 3.5 - 1.400 - 0.2349 = 1.87 g

2. Calculate the moles of each element

$\text{Moles of C = 1400 mg C}\times\dfrac{\text{1 mmol C}}{\text{12.01 mg C }} = \text{116.6 mmol C}\\\\\text{Moles of H = 234.9 mg H} \times \dfrac{\text{1 mmol H}}{\text{1.008 mg H}} = \text{233.1 mmol H}\\\\\text{Moles of O = 1870 mg O} \times \dfrac{\text{1 mmol O}}{\text{16.00 mg O}} = \text{116 mmol O}$

3. Calculate the molar ratios

Divide all moles by the smallest number of moles.

$\text{C: } \dfrac{116.6}{116.6}= 1\\\\\text{H: } \dfrac{233.1}{116.6} = 1.999\\\\\text{O: } \dfrac{116}{116.6} = 1.00$

4. Round the ratios to the nearest integer

C:H:O = 1:2:1

5. Write the empirical formula

The empirical formula is CH₂O.

6. Calculate the molecular formula.

EF Mass = (12.01 + 2.016 + 16.00) u = 30.03 u

The molecular formula is an integral multiple of the empirical formula.

MF = (EF)ₙ

$n = \dfrac{\text{MF Mass}}{\text{EF Mass }} = \dfrac{\text{150 u}}{\text{30.03 u}} = 5.00 \approx 5$

MF = (CH₂O)₅ = C₅H₁₀O₅

The molecular formula of X is C₅H₁₀O₅.

8 0

4 years ago

An atom is a small building block that forms matter. Many different models of an atom have been made over the years. Which of th

puteri [66]

Answer:

The correct option is A) The atom has changed over the years.

Explanation:

Option A is not correct because an atom does not change. It remains the same always. The structure of an atom will always contain neutrons, protons and electrons.

Scientific theories tend to change over time as new information is brought up. Novel techniques lead to more advanced experiments and results. As a result, a scientific theory is subjected to change whenever evidence is found for a new theory which challenges the older one.

The atomic theory has changed many times due to novel scientific techniques and experiments.

8 0

3 years ago

Are moles larger than atoms?

nataly862011 [7]

Answer:

YES BC ATMONS ARE THE SMALLEST UNIT sorry for caps

Explanation:

3 0

3 years ago

Read 2 more answers

Which of the following is used to show sound waves?

Ipatiy [6.2K]

I think it’s c bc it makes more sense

3 0

3 years ago