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2 years ago

what was happening to the H20 when the lines on the graph were mostly flat? What kind of energy was being added to the system?

2 answers:

8 0

Answer: A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it.

The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.

Water has a high boiling point because of the strong hydrogen bonds between the water molecules; it is both a strong hydrogen bond donor and acceptor.

The first change of phase is melting, during which the temperature stays the same while water melts. The second change of phase is boiling, as the temperature stays the same during the transition to gas

Explanation:

bearhunter [10]2 years ago

6 0

That's latent heat of vaporization.

Water boils at 100°C
The graph increases still 100°C
once it reaches boiling point it yields a straight line because of latent heat after all molecules are evaporated then the graph rises back

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26. All atoms area. positively charged, with the number of protons exceeding the number of electronsb, negatively charged, with

user100 [1]

(26) All atoms area...<span><span>with the number of protons equaling the number of electrons

</span>(27) </span>The particles that are found in the nucleus of an atom are...<span> protons and neutrons.

(28) </span>As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true?...<span>Protons. electrons, and neutrons are evenly distributed throughout the volume of the atom.

(29) </span>The nucleus of an atom is...<span>the central core and is composed of protons and neutrons</span>.

7 0

3 years ago

Michela and Simone are camping in a tent during some hot weather. They

eimsori [14]

Answer:

i think that the wet cloth will keep the coolness inside the water instead of evaporating and getting warm

Explanation:

8 0

3 years ago

Help please ;( really don’t understand Chemistry would really appreciate it if can explain to me thank you!

Tanya [424]

Answer:

b) O₂

d) CH₄

Explanation:

In a chemical equation, the <u>reactants</u> are the substances that are written on the <u>left side</u>. The reactants react to produce the products. On the right side, the products are written.

The arrow => is used to separate the reactants from the products.

To the left of the arrow, you can see this written:

CH₄ + 2O₂

The plus sign + is used to separate each reactant.

In 2O₂ you can ignore the big 2 because it is a coefficient, which is written to balance the equation.

The reactants are CH₄ and O₂

7 0

3 years ago

A sample of chlorine gas is held at a pressure of 1023.6 kPa. When the pressure is decreased to 8114 kPa the

eduard

Answer:

T₁ = 39 K

Explanation:

Given data:

Initial pressure = 1023.6 kpa

Final pressure = 8114 kpa

Final temperature = 36°C (36+ 273= 309K)

Initial temperature = ?

Solution:

P₁/T₁ = P₂/T₂

T₁ = P₁×T₂ /P₂

T₁ = 1023.6 kpa × 309 K /8114 kpa

T₁ = 316292.4 K. Kpa /8114 kpa

T₁ = 39 K

Thus original pressure was 39 k.

3 0

3 years ago

How old is a bone if it now .3125 of C-14 when it originally had 80.0g of C-14

Taya2010 [7]

<h3>Answer:</h3>

42960 years

<h3>Explanation:</h3>

<u>We are given;</u>

Remaining mass of C-14 in a bone is 0.3125 g
Original mass of C-14 on the bone is 80.0 g
Half life of C-14 is 5370 years

We are required to determine the age of the bone;

Using the formula;

Remaining mass = Original mass × 0.5^n , where n is the number of half lives.

Therefore;

0.3125 g = 80.0 g × 0.5^n

3.90625 × 10^-3 = 0.5^n

Introducing logarithm on both sides;

log 3.90625 × 10^-3 = n log 0.5

Solving for n

n = log 3.90625 × 10^-3 ÷ log 0.5

= 8

Therefore, the number of half lives is 8
But, 1 half life is 5370 years
Therefore;

Age of the rock = 5370 years × 8

= 42960 years

Thus, the bone is 42960 years old

7 0

3 years ago