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tensa zangetsu [6.8K]
4 years ago
5

For a substance to change from a liquid to a solid, what must happen to its

Physics
1 answer:
JulsSmile [24]4 years ago
8 0

Answer:

C. They must lose enough of their kinetic energy so that the  attractions between them hold in place as they vibrate.

Explanation:

The "kinetic energy" refers to the energy of an object when it is moving. This is directly proportional to the object's "thermal energy." <em>If the kinetic energy of an object increases, </em><em>the thermal energy increases</em> and <em>if the kinetic energy decreases, </em><em>the object's thermal energy decreases</em><em> as well.</em>

Changing the phase of an object from liquid to solid means that the object will be subjected to low temperature. This means the thermal energy will decrease as well as the kinetic energy. This is known as "freezing." <u>The object needs to lose enough kinetic energy.</u> This results to its particles moving closer together in an attractive force.

So, this explains the answer.

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As science being dynamic many things will change and due to this changes many things and theories will be new to us. the model of the atom is not weak, it is just developing as time progress because in the early times it is not fully understood because of the lack of technology to study, what scientist do is just filling the knowledge gap of the previous studies.
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Marina86 [1]

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Skin

Explanation:

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Which identifies the energy transformations that take place in Anna’s body as this process takes place?
PtichkaEL [24]

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Chemical energy is converted to thermal energy and electrical energy.

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Given two vectors A--&gt; = 4.20 i^+ 7.20 j^ and B--&gt; = 5.70 i^− 2.40 j^ , find the scalar product of the two vectors A--&gt;
Arisa [49]

Answer:

\vec{A}\times \vec{B}=-51.12\hat{k}

\theta=83.2^{\circ}

Explanation:

We are given that

\vec{A}=4.2\hat{i}+7.2\hat{j}

\vec{B}=5.70\hat{i}-2.40\hat{j}

We have to find the scalar product and the  angle between these two vectors

\vec{A}\times \vec{B}=\begin{vmatrix}i&j&k\\4.2&7.2&0\\5.7&-2.4&0\end{vmatrix}

\vec{A}\times \vec{B}=\hat{k}(-10.08-41.04)=-51.12\hatk}\hat{k}

Angle between two vectors is given by

sin\theta=\frac{\mid a\times b\mid}{\mid a\mid \mi b\mid}

Where \theta in degrees

\mid{\vec{A}}\mid=\sqrt{(4.2)^2+(7.2)^2}=8.3

Using formula\mid a\mid=\sqrt{x^2+y^2}

Where x= Coefficient of unit vector i

y=Coefficient of unit vector j

\mid{\vec{B}}\mid=\sqrt{5.7)^2+(-2.4)^2}=6.2

\mid{\vec{A}\times \vec{B}}\mid=\sqrt{(-51.12)^2}=51.12

Using the formula

sin\theta=\frac{51.12}{8.3\times 6.2}=0.993

\theta=sin^{-1}(0.993)=83.2degrees

Hence, the angle between given two vectors=83.2^{\circ}

7 0
4 years ago
A 2.0-g piece of Mg reacts with HNO3. Which conditions would produce the GREATEST reaction rate
amid [387]

Answer:

1.0 M HNO3 at 40<em>°C</em>

Explanation:

Rate of chemical reaction: This can be defined as the number of moles of reactant, converted or product formed per unit time.

Factors that affect rate of chemical reaction:

(a) Temperature:  Generally, an increase in temperature increase the rate of chemical reaction by (1) increasing the number of particles with energy equal to or greater than the activation energy, (2) Increasing the average speed of all the reactant particles, due to greater kinetic energy, leading to higher frequency of collision.

(b) Concentration: An increase or decrease in the concentration of the reactant will  result to a corresponding increase or decrease in the effective collision of the reactant and hence in the reaction rate.

other factors that affect the rate of chemical reaction are

(i) Nature of the reactant

(ii) Surface area of reactant

(iii) presence of light

(iv) presence of catalyst.

From the question above,

<em>The condition with the highest temperature and concentration will produce the GREATEST reaction rate.</em>

<em>And that is  1.0 M HNO3 at 40 °C</em>

4 0
4 years ago
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