Which elements have 8 valence electrons?

A cup of water at room temperature has a higher temperature than a cup of cold water. Therefore, a cup of water at room temperature would have more thermal energy. Therefore, option (C) is correct.

Thermal energy is generated when an increase in temperature causes atoms and molecules of a substance to move faster and as result, they collide with each other. The energy generated from the temperature of the heated material is called thermal energy.

Thermal Energy is due to the random motion of molecules, also known as internal Kinetic Energy. The thermal energy of a given material is directly proportional to the temperature.

The greater the temperature of a substance, the more the movement of molecules and the greater the thermal energy of that substance. Therefore, the cup of water has a higher temperature than the cup of cold water. The water molecules move faster in the cup of water at room temperature.

Therefore, a cup of room-temperature water has higher thermal energy.

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Answer:

i think that the best description of cirrus clouds is the the third option

Explanation:

i hope this helps you!

Answer:

Here are some questions that could be asked about the data:

Could the heat wave be attributed to other causes?

Are similar heat waves occurring in areas with similar climates?

How often are heat waves occurring compared to past periods?

Explanation:

Edmentum sample answer

Hope this helps :)

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Answer: 5 m/s 2 south

Explanation:

Vector quantities have both magnitude and direction.

Scalar quantities have only magnitude.

Distance is a scalar quantity. It refers only to how far an object has traveled. For example, 4 feet is a distance; it gives no information about direction. To say an object traveled 4 feet is somewhat ambiguous. To say the object traveled 4 feet west, for example, would be a displacement, and would then be a vector quantity. It gives a more complete picture of what happened.

Mass is a scalar quantity. Simply put, it refers to how much matter an object is made up of. It has magnitude but gives no indication of direction in any sense. The vector counterpart to mass is weight.

Weight is a vector quantity. Weight is a force, and forces are vectors, i.e. having both magnitude and direction. Perceived weight of an object at rest on earth is given by

W

=

→

F

g

=

m

g

, the product of the mass of the object and the free-fall acceleration constant,

g

, or simply equal to the force of gravity acting on the object. The force of gravity acts downward.

Time is a scalar quantity (as far as we are concerned at this level). It gives information about magnitude, i.e. how much time, but no information about direction.

Volume is a scalar quantity. It refers to the amount of space that an object occupies and therefore has magnitude, but gives no information about direction.

Density is a scalar quantity, having only magnitude and giving no information about direction. We can also reason that, because density is equal to mass divided by volume and both mass and volume are scalar quantities, density must also be a scalar quantity.

Speed is a scalar quantity, having only magnitude and giving no information about direction. For example,

40

m

s

is a speed, it tells us how fast an object is traveling, but nothing abut which direction the object is traveling in. The vector counterpart to speed is velocity.

Velocity is a vector quantity. Velocities have both magnitude and direction. For example,

40

m

s

NE is a velocity.

Acceleration is a vector quantity. Acceleration has both magnitude and direction. For example,

9.8

m

s

2

downward or

−

9.8

m

s

2

vertically is an acceleration.

Force is a vector quantity. Force has both magnitude and direction. Weight is an example of force given above. Another is the force of friction, which has some magnitude and acts in the direction opposite that of motion.

Temperature is a scalar quantity. A measurement of temperature has magnitude, but gives no information about direction.

Energy is a scalar quantity. It gives information about magnitude, e.g. how much energy an object has, but none about direction.

Note that certain quantities which are alone scalars can be represented as vectors when we discuss intervals or how the quantities change (e.g. measure of increase or decrease).

Resposta:

5 m/s2

a aceleração é a razão entre a variação de velocidade e a variação do tempo

Answer:

the name for CaCO3 is Calcium Carbnate, and its relations with coral reefs is that the process for making said compuond happens within coral, and is considered the building block for coral reefs.

Explanation:

hope this helps!

Answer:

large atoms

Explanation:

its kinda obvious

Answer:

large atoms (B)

Explanation:

The properties of all of these material vary from each other. Paper, cardboard and plastic are insulators and metals and conductors. Each of them has different physical properties.

The physical properties of a substance include properties which changes its physical structure, size, shape, phase etc. Solubility, conductivity, resistance etc. are also physical properties.

Here, paper, cupboard and plastic are insulators and they does not conduct electricity. Whereas, metals are very good conductors and they have wide range of applications in optoelectronic devices.

Each of these materials has different melting temperature and different uses. Their density also vary significantly. The paper is the less dense one here and metals are denser.

The applications of these materials are based on their physical properties.

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Answer:

A

Explanation:

Answer:

A becas hot air rising

Explanation:

Answer:

Important direct drivers include habitat change, climate change, invasive species, overexploitation, and pollution. Most of the direct drivers of degradation in ecosystems and biodiversity currently remain constant or are growing in intensity in most ecosystems

Explanation:

Important direct drivers include habitat change, climate change, invasive species, overexploitation, and pollution. Most of the direct drivers of degradation in ecosystems and biodiversity currently remain constant or are growing in intensity in most ecosystems

I believe number one has 2 valance electrons

number 2 has 1 valance electron

and number 3 has 8 valance electrons

valance electrons are the electrons on the outermost ring

Answer :

(a) The name of gas given off in the reaction is hydrogen gas.

(b) When we take the test tube containing zinc and sulfuric acid near a candle or a burner, we hear a pop sound. This shows the presence of hydrogen gas.

(c) The products formed in this reaction are zinc sulfate and hydrogen gas.

(d) When the evolution of hydrogen gas will stop.

(e) The word equation for this reaction is:

Zinc + Sulfuric acid \(\rightarrow\) Zinc sulfate +Hydrogen gas

Explanation:

As we know that when an acid reacts with a metal, then a salt and hydrogen gas are formed.

As per question, when sulfuric acid reacts with zinc metal then zinc sulfate and hydrogen gas are formed.

The word equation for this reaction is:

Zinc + Sulfuric acid \(\rightarrow\) Zinc sulfate +Hydrogen gas

The balanced chemical reaction is as follows:

\(Zn(s)+H_2SO_4(aq)\rightarrow ZnSO_4(aq)+H_2(g)\)

In this reaction, zinc metal displaces the hydrogen form sulfuric acid.

When we take the test tube containing zinc and sulfuric acid near a candle or a burner, we hear a pop sound. This shows the presence of hydrogen gas.

Answer:

a

Explanation:

just needed the points, sorry

Answer:

I'm confused what is this?

Explanation:

Answer:

When passing through a vacuum, all electromagnetic waves irrespective of their individual wavelengths must possess the same speed. This is called the speed of light in a vacuum. The speed of light in a given medium is a constant and applies to all electromagnetic waves irrespective of their frequency and wavelength.

Explanation:

Hope it helps :-)

Answer: the correct one would be option B.

Explanation:

Answer:

the answer is C hope I helped

Answer:

c

Explanation:

c. The atom becomes positively charged

if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom

Answer:

C

Explanation:

Answer:

4) Mixtures contain different substances with different properties and chemists can separate one item from the mixture by forcing it to undergo a chemical change.

Explanation:

Mixtures contain different substances with different physical properties, such as boiling point, melting point, solubility, density, and so on. These properties can be used to separate the individual substances in the mixture through various techniques. For example, distillation is a separation technique that relies on differences in boiling points of the substances in a mixture. When a mixture is heated, the substance with the lower boiling point will vaporize first, and it can be collected and cooled to form a pure substance. Similarly, other techniques such as chromatography, filtration, and crystallization also rely on differences in physical properties to separate mixtures.

On the other hand, chemical changes involve the rearrangement of atoms within a substance, resulting in the formation of a new substance with different properties than the original. While chemical changes can be used to synthesize new substances, they are not typically used to separate mixtures.

Answer:

sugar-water is a mixture not a compound.(homogeneous mixture.)

Explanation:

Compounds are substances formed by the chemical combination of two or more elements. Mixtures are substances formed by physically mixing two or more substances together.

The solution of sugar in water is considered a mixture not a compound because the particles of sugar and water are not completely dissolve nor mixed in a fixed proportion or ratio. hope this helped :)

Answer:

observations (2), (3), and (4) provide strong evidence that a chemical reaction occurred.

Explanation:

Observations (2), (3), and (4) are evidence of a chemical reaction because a precipitate formed, energy was released (the bottom of the beaker felt warm), and bubbles were formed in the water. Observation (1) indicates a physical change, not a chemical reaction.

Answer:

o.75

Explanation:

A train moving at a velocity of 15 m/s is accelerated to 24m/s over a 12 second period, time traveled by the train is 12 seconds.

The initial velocity u of the train is 15 m/s, the final velocity v is 24 m/s, and the time t is 12 seconds. The train is undergoing uniform acceleration.

We can use the kinematic equation to relate the initial velocity, final velocity, acceleration, and time:

v = u + at

Solving for t:

\(\[ t = \dfrac{v - u}{a} \]\)

Given that a is the acceleration and is calculated as:

\(\[ a = \dfrac{v - u}{t} \]\)

Substitute the given values:

\(\[ a = \dfrac{24 \, \text{m/s} - 15 \, \text{m/s}}{12 \, \text{s}} \]\)

\(\[ a = \dfrac{9 \, \text{m/s}}{12 \, \text{s}} \\\\= 0.75 \, \text{m/s}^2 \]\)

Now substitute the calculated acceleration back into the equation for \( t \):

\(\[ t = \dfrac{v - u}{a} \\\\= \dfrac{24 \, \text{m/s} - 15 \, \text{m/s}}{0.75 \, \text{m/s}^2} \]\)

\(\[ t = \dfrac{9 \, \text{m/s}}{0.75 \, \text{m/s}^2} \\\\= 12 \, \text{s} \]\)

Thus, the time traveled by the train is 12 seconds.

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Your question seems incomplete, the probable complete question is:

A train moving at a velocity of 15 m/s is accelerated to 24m/s over a 12 second period. Determine the time travelled​

Answer: B.) the sun is closer to the Earth

Answer:

C

Explanation:

the sun is really hot so that is why

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