Which statement describes a physical change?a. A carton of milk souring
b. A piece of silver flatware tarnishing
c. Dry ice subliming into carbon dioxide
d. Two clear solutions forming a precipitate when mixed

Answers

Answer 1

Answer: The correct answer C. Dry ice subliming to carbon dioxide is an example of a physical change. This type of change is when only the appearance changed but the substance is still the same. It is the opposite of a chemical change where a new substance is formed from this change.

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What is the percent by mass of potassium in K3Fe(CN)6?16.96%
21.88%
25.53%
35.62%

Answers

The percent mass of potassium in K3Fe(CN)6 is 35.62%. The molar mass (Mr) of K3Fe(CN)6 is the sum of atomic masses (Ar) of its elements. Ar(K) = 39.1 g/mol, Ar(Fe) = 55.84 g/mol; Ar(C) = 12.01 g/mol; Ar(N) = 14.01 g/mol. Mr(K3Fe(CN)6) = 3Ar(K) + Ar(Fe) + 6Ar(C) + 6Ar(N) = 3 * 39.1 + 55.85 + 6 * 12.01 + 6 * 14.01 = 117.3 + 55.85 + 72.06 + 84.06 = 329.27 g/mol. There are 3 atoms of K, so total mass of K in K3Fe(CN)6 is: 3Ar(K) = 3 * 39.1 = 117.3 g/mol. In percents, this is: 329.27 : 100% = 117.3 : x. x = 100% * 117.3 : 329.27 = 35.62%

Answer:

%35.62

Explanation:

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Protons inside the nucleus of an atom are held together though they have the same charge because?

Answers

Answer: Protons inside the nucleus of an atom are held together despite having the same positive charge because of the strong nuclear force, also known as the strong nuclear interaction or simply the strong force. The strong force is one of the fundamental forces in nature, along with gravity, electromagnetism, and the weak nuclear force. It is responsible for binding protons and neutrons (collectively known as nucleons) together in the nucleus of an atom.

Explanation: The strong force is an extremely powerful force at very short distances, acting over a range of about 1 femtometer (10^-15 meters). This force is much stronger than the electrostatic repulsion between protons due to their positive charges. So, even though protons have the same positive charge and would naturally repel each other due to the electromagnetic force, the strong nuclear force overcomes this repulsion and binds them together within the nucleus, keeping the nucleus stable.

Final answer:

Protons inside the nucleus of an atom are held together by the nuclear force, also known as the strong nuclear force. This force is strong enough to override the repulsive electromagnetic force between protons.

Explanation:

Protons inside the nucleus of an atom, despite having the same positive charge and thus naturally repelling each other, are held together fundamentally due to a force called the nuclear force, sometimes referred to as the strong nuclear force or strong interaction.

This is one of the four basic forces of nature, the others being gravity, electromagnetic force, and the weak nuclear force. The nuclear force is so strong that it overrides the repulsive electromagnetic force between protons thereby holding the protons together inside the nucleus.

Learn more about Nuclear Force here:

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The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 3.00 g of butane?

Answers

First, calculate the number of mols of C4H10 in 3.00 g of C4H10.

3.00g C4H10 / 58.1 g C4H10 = .0516 mol C4H10
There are 4 atoms of carbon per mol of C4H10
Multiply .0516 mol C4H10 by 4 (number of atoms of carbon)=.20654 mol Carbon.
To convert to atoms, multiply that by avogadro's number, 6.022 x 10^23
which equals 1.2438 x 10^23 atoms of Carbon

Answer:

1.2433 *10^23 carbon atoms

Explanation:

First you need to calculate the grams of the empirical formula.

C4H10

Carbon = 12.01 g x 4

Hydrogen = 1.008 x 10

Sum those together to get = 58.12 g

Divide the 3.00g by the total g in the compound.

3.00/58.12 = 0.0516

Then times 0.0516 by the number of carbon atoms

0.0516 x 4 = .20646

Then multiple by Avogadro's number

.20646 x 6.022x10^23 = 1.2433x10^23

Rounded to 1.24x10^23 carbon atoms

Why can't there be a temperature lower than absolute zero?

Answers

At absolute zero, there would be no energy left, and negative energy is unknown to us, so you cannot go lower than a state with no energy. Atoms would stop moving.

A drop of vinegar ( a weak acid ) is placed on a sample of each of the materials below. Which will show the most active reaction? A. glass
B. marble
C. copper
D. steel

Answers

Answer: Option (B) is the correct answer.

Explanation:

Marble is also known as calcium carbonate and its chemical formula is $CaCO_(3)$ .

When it combines with vinegar then it results in the formation of calcium acetate which is a water soluble compound along with the release of carbon dioxide which occurs in the form of bubbles and water.

The reaction is as follows.

$CaCO_(3) + CH_(3)COOH \rightarrow Ca(CH_(3)COOH)_(2) + H_(2)O + CO_(2)$