when a substance melts the kinetic energy

A Decreases then increase

B Decrease

C Stays the same

D Increase

The electronegativitie of the period-3 element are lited on the tranparency.. Si and Cl  is 0.7, . Mg and S is 1.3,  Si and S is 1.7, Al and P is 1.6.

The electronegativity of the atoms that make up the bond determines whether it is nonpolar or polar covalent. An atom's propensity to draw electrons (or electron density) in its direction is measured by its electronegativity. It controls how the shared electrons between the two atoms in a bond are distributed. The more an atom's electronegativity, the more strongly the electrons in its bonds are drawn to it. In a polar covalent bond, electrons are pushed in the direction of the more electronegative atom; as a result, the atom with the partial negative charge is the more electronegative atom. The electron distribution becomes increasingly polarised and the atoms' partial charges increase with increasing electronegativity differences.

Learn more about electronegativity here:

https://brainly.com/question/29810769

#SPJ4

The reason for the difference in the conclusions of Bohr and Rutherford is because they had different focuses in their experimental process. Option B

The atom is the smallest unit of a substance which can take part in a chemical reaction. Now we know that many of the early scientists worked hard to be able to understand the structure of the atom. This led to the development of many theories about the structure of the atom.

It is worthy of note that in the search for the exact nature of the structure of the atom, the focus of different scientists were not the same. As such, the reason for the difference in the conclusions of Bohr and Rutherford is because they had different focuses in their experimental process. Option B

Learn more about atomic model:https://brainly.com/question/9145431

#SPJ1

Answer:

Conduct more trials

Explanation:

Theoretical Probability can be defined as what someone is expecting to happen

Experimental Probability on the other hand, is defined as what actually happens.

Probability is usually calculated in the same way for experimental probability and that of theoretical probability. You divide the total number of possible ways in which a particular outcome can happen, by the total number of outcomes itself.

In Experimental probability, the more times a probability is tried, it gets closer and even more closer to theoretical probability.

So, for the question, Jamie should improve the number of tries more, so as to get his experimental probability results to be closer to the theoretical probability result.

Answer:

A. He can increase the number of trials

Explanation:

If you added 0.5 g of sample 1 instead of 2.0 g, the freezing point temperature of the solution would decrease.

When a solute is added to a solvent, it disrupts the formation of the solvent's crystal lattice structure, lowering the freezing point of the solution. The extent to which the freezing point is lowered depends on the concentration of the solute particles in the solution. In this case, by reducing the amount of sample 1 from 2.0 g to 0.5 g, the concentration of solute particles in the solution would decrease.

Since the freezing point depression is directly proportional to the concentration of solute particles, a decrease in the amount of sample 1 would result in a smaller decrease in the freezing point temperature compared to if 2.0 g were added. In other words, the solution would experience a less significant decrease in freezing point temperature with only 0.5 g of sample 1.

Learn more about: freezing point depression

brainly.com/question/30389524

#SPJ11

Answer:

\(\boxed {\boxed {\sf 104 \%}}\)

Explanation:

Percent ratio is the ratio of the actual yield to the theoretical yield. The formula is below.

\(Percent \ Yield} = \frac{{Actual \ Yield}}{{Theoretical \ Yield}} \times 100 \%\)

The reaction of sodium and chlorine should theoretically yield 12.5 grams, but the actual yield was 13.0 grams.

Substitute these values into the formula.

\(Percent \ Yield} = \frac{{13.0 \ g }}{{12.5 \ g}} \times 100 \%\)

Divide.

\(Percent \ Yield} = 1.04 \times 100 \%\)

Multiply.

\(Percent \ Yield= 104 \%\)

For this reaction, the percent yield is 104%

Answer:

yes

Explanation:

it change everything

im pretty sure the awnser is yes

Answer:

Know this

1mole of a substance contains 6.022x10²³molecules

Now

8.55x10^-15moles x 6.022x10²³molecules/1mole

=5.15x10^9molecules.

Answer:

B,C

Explanation:

#4, answer: a This is because the Earth is spinning towards the east. The Earth spins about its axis, an imaginary line that runs through the middle of the Earth between the North and South poles.

#5 a, answer: c

Answer:

A

Explanation:

A compound machine is a combination of two or more simple machines.

The Diels-Alder reaction is a [4+2] cycloaddition reaction, where a conjugated diene and an alkene react to form a cyclic compound. The reaction occurs under thermal conditions and proceeds through a concerted mechanism. The reaction results in the formation of a cyclohexene derivative as shown below.

In the given reaction, the conjugated diene is 1,3-butadiene, which is shown below:And the alkene is ethylene, which is shown below:Now, let's draw the reactants that would react to form this cyclohexene derivative in a Diels-Alder reaction:Note that the stereochemistry of the product is not relevant since it is a racemic mixture. Thus, any stereochemical configuration can be used for the reactants. The reactants are shown below:Thus, the reactants that would react to form this cyclohexene derivative in a Diels-Alder reaction are 1,3-butadiene and ethylene.

To know more about Diels-Alder reaction, visit:

https://brainly.com/question/30751490

#SPJ11

The answer Is Alpha particle

Explanation:

:D

Answer:

Tectonic plates

Explanation:

All the natural disasters like earthquakes, volcanoes and geysers appear throughout the region of New Zealand because of the movement of tectonic plates underneath the surface. New Zealand rests on the edges of two tectonic plates including the Pacific and the Australian plates.

Answer:

B

Explanation:

it will not be waterproof anymore

Answer:

water

Explanation:

because it's capable of dissolving more substances

Answer:

B. water  It can dissolve more substances

Explanation:

Answer:

When we are on an airplane above the clouds, it can appear as if we're passing each cloud slowly because there is no frame of reference to judge our speed. Our eyes can't detect any movement on the ground, and there are no other objects in the sky to provide a sense of speed or motion. Additionally, clouds are often quite large, so it can take several minutes to pass over one even at high speeds. This can create the illusion that we're moving slowly, even though we're actually traveling at several hundred miles per hour. Our brains are not accustomed to seeing objects at such a high altitude and speed, so it can be difficult to accurately judge our motion relative to the clouds.

Answer:

0.105 KCl

Explanation:

(Step 1)

If the solution is 32.7% KCl, we can assume that there are 32.7 grams KCl in the solution. This means that there would be 67.3 grams H₂O (100% - 32.7% = 67.3%) in the solution.

32.7% KCl = 32.7 g KCl

67.3% H₂O = 67.3 g H₂O

(Step 2)

Now, we need to convert both the solute (KCl) and the solvent (H₂O) into moles. This can be done by multiply the grams of each substance by their molar masses.

32.7 g KCl              1 mole
------------------  x  --------------------  = 0.439 mole KCl
                               74.55 g

67.3 g H₂O           1 mole
------------------  x  -----------------  =  3.74 moles H₂O
                             18.016 g

(Step 3)

Finally, we can calculate the mole fraction of KCl using the following equation. The final answer should have 3 sig figs to match the given value with the lowest amount of sig figs (32.7 g).

                                             moles of solute
Mole Fraction  =  -----------------------------------------------------  
                              moles of solute + moles of solvent

                                            0.439 mole KCl
Mole Fraction  =  ------------------------------------------------------  
                              0.439 mole KCl + 3.74 moles H₂O

Mole Fraction  =  0.105 KCl

Answer:

true

Explanation:

Carbon dioxide (CO2) makes up the vast majority of greenhouse gas emissions from the sector, but smaller amounts of methane (CH4) and nitrous oxide (N2O) are also emitted. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.

The universal gas constant, R, has different values and units in cgs units depending on the class of problems. For mass-related problems, R has a value of 8.31 × 10^7 erg/(mol·K). For heat-related problems, R has a value of 1.987 cal/(mol·K) or 8.314 J/(mol·K).

(i) For mass-related problems, such as changes in pressure, volume, or number of moles, the universal gas constant, R, in cgs units has a value of 8.31 × 10^7 erg/(mol·K). The cgs unit system uses the erg as the unit of energy, and the mole (mol) as the unit of the amount of substance. The Kelvin (K) is used for temperature. This value of R allows for the calculation of changes in pressure, volume, or number of moles in these types of problems in the cgs unit system.

(ii) For heat-related problems, where the amount of heat required to heat up a given mass or volume is considered, the universal gas constant, R, in cgs units has a value of 1.987 cal/(mol·K) or 8.314 J/(mol·K). In this context, the cal (calorie) or the J (joule) is used as the unit of energy, the mol represents the amount of substance, and K stands for Kelvin. This value of R enables the calculation of the amount of heat required in caloric or joule units for heating processes involving a given mass or volume in the cgs unit system.

Learn more about pressure: brainly.com/question/30673967

#SPJ11

Answer:

it's because the liquid in the bottle is supercooled

Answer:

122 gm

Explanation:

54 days is 2 half lives :    ( 27 * 2 = 54)

  1/2   * 1/2 = 1/4 will be left

      1/4 * 488 = 122 gm

The 1.591 moles of boron trichloride will be produced when 4.772 moles of hydrochloric acid react completely in this reaction.

To determine how many moles of BCl3 are produced from 4.772 moles of HCl, we can use the following calculation:

4.772 moles HCl × (2 moles BCl3 / 6 moles HCl) = 1.591 moles BCl3

Hydrochloric acid is a strong, highly corrosive, colorless and pungent-smelling acid that is commonly used in various industries and laboratory settings. Its chemical formula is HCl, and it is a diatomic molecule consisting of hydrogen and chlorine atoms.

Hydrochloric acid has a pH of around 1, which makes it highly acidic and able to dissolve many metals, including iron, zinc, and aluminum. It is also used in the production of various chemicals, such as vinyl chloride, which is used to make PVC. In the human body, hydrochloric acid is found in the stomach and is essential for the digestion of food, particularly proteins. It works by breaking down food into smaller particles, which can then be absorbed by the body.

To learn more about Hydrochloric acid visit here:

brainly.com/question/24586675

#SPJ4

The temperature along the H-R-x-axis. A's Growing from left to right.

Moreover, the temperature can be seen to drop as one moves further to the right along the x-axis. Moreover, the H-R diagram can be broadly divided into four quadrants. The stars in the top-left quadrant are warm and brilliant, while those in the top-right quadrant are cool and bright.

If you can interpret what each axis in the HR diagram implies, it's really simple to understand. The star's surface temperature is measured along the horizontal axis in Kelvin. The stars on the right are significantly cooler and redder in hue than the stars on the left, and they are 3000 Kelvin in temperature.

To know more about H-R Diagram visit:

https://brainly.com/question/18231216

#SPJ4

The number of revolutions each tire make is ;  693.62 revs/km

Using the given data:

Diameter of bicycle tires = 27.1 inches

Radius ( r ) = 27.1 / 2 = 13.55 inches

distance covered by bicycle = 1.5 km

determine number of revolutions made by each tire

Number of revolutions = distance covered / circumference of tire

circumference = 2 π r

                        = 2 * π * 13.55 = 85.14 inches

∴ number of revs = 1.5 km / 85.14 inches  = 693.62 revs

Hence we can conclude that the number of revolutions each tire make =  693.62 revs/km

Learn more : https://brainly.com/question/24713579

Answer:

Depends on what you're doing, you could be running and it goes higher, temperature isn't too much of a difference.

Explanation:

Equilibrium is a state in a chemical reaction where the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in the concentrations of reactants and products. It is represented by a double arrow (⇌) in chemical equations. In the given equation: H₂O (g) + CO (g) ⇌ H₂(g) + CO₂(g) + 42 KJ

To shift the equilibrium to the right, one or more of the following could occur:

Increasing the concentration of H₂ or CO₂

Decreasing the concentration of H₂O or CO

Increasing the pressure

Removing some of the products (H₂ and CO₂)

Decreasing the temperature

To shift the equilibrium to the left, one or more of the following could occur:

Decreasing the concentration of H₂ or CO₂

Decreasing the pressure

Increasing the temperature

If pressure is increased, the equilibrium will shift in the direction that produces fewer moles of gas. In this case, since there are fewer moles of gas on the right side of the equation (H₂ and CO₂), the equilibrium will shift to the right. If heat is added, the equilibrium will shift in the endothermic direction to absorb the additional heat. In this case, the forward reaction is endothermic (42 KJ on the right side), so the equilibrium will shift to the right to consume the added heat.

If CO is added, the equilibrium will shift to the right to consume the additional CO.The concentration of H₂O and CO₂ will increase, while the concentrations of H₂ and CO will decrease until a new equilibrium is reached.

for such more questions on reaction

https://brainly.com/question/11231920

#SPJ8

In the following redox reaction, the reducing agent is MnO2 (option D). Details about reducing agent can be found below.

A reducing agent in a redox reaction is any substance that reduces, or donates electrons to another, hence, it becomes oxidized.

According to this question, a redox reaction is given as follows: MnO2(s) + 4H+(aq) + 2Cl–(aq) = Mn2+(aq) + 2H2O(l) + Cl2(g)

As shown in the equation, MnO2 is oxidized into Mn2+, therefore, it is the reducing agent.

Learn more about reducing agent at: https://brainly.com/question/2890416

#SPJ1

There are 7.23 × 10²⁴ particles in 12 moles of sand.

The mole is defined as "The amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12" . It is represented by the symbol "mol".

A mole is the amount of material which consists of 6.022 × 10²³ particles. This number is known as Avogadro's number.

Number of particles in 1 mole of any substance= 6.022 × 10²³

So, 1 mole of sand contains  6.022 × 10²³ particles

12 moles of sand will contain

= 12 × 6.022 × 10²³ particles

=7.23 × 10²⁴ particles

To know more about moles here

https://brainly.com/question/17256481

#SPJ4