1. What is the bond angle between the hydrogen atoms in an ammonia (NH3) molecule? 2. What is the bond angle between the oxygen atoms in the carbon dioxide molecule? 3. What is the molecular geometry of a methane (CH4) molecule?

Answers

Answer 1

Answer:

The answer is 107 degrees. The geometric shape for ammonia is Trigonal Pyramidal, even though its electron geometry is “Tetrahedral”. This is because ammonia has a lone pair of electrons that occupy its space like the other 3 hydrogens in the geometric structure.

The answer 180 degrees. This is because of the linear geometric structure of carbon dioxide. The oxygen atom is on either side of the carbon atom, each is bound by a double covalent bond. All the atoms are involved in the bond and there are no one pair electrons.

The answer is tetrahedral geometry. This is because all the 4 valence electrons of the carbon are involved in a bond with a hydrogen atom. The angles in a tetrahedral geometric arrangement, such as in methane, is 109.5 degrees, where the hydrogen atoms are as far apart, from each other, as possible .

Answer 2

Answer: 1. 107 degrees
2.180 degrees
3.Tethahedral

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A tennis ball with a speed of 15.7 m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 14.444 m/s. If the ball is in contact with the wall for 0.0099 s, what is the average acceleration of the ball while it is in contact with the wall? Take "toward the wall" to be the positive direction. Answer in units of m/s 2 .

According to Ohm's law, what are the two variables that affect the amount of current in a circuit?

Answers

According to Ohm's law, the two variables that affect the amount of current in a circuit are: voltage and resistance. Ohm's law states that the current is directly proportional to the voltage, and inversely proportional to the resistance of an element.

Final answer:

The two variables that affect current in a circuit according to Ohm's law are voltage and resistance. If voltage increases, current increases assuming resistance remains constant. Conversely, if resistance increases, current decreases.

Explanation:

According to Ohm's law, the two variables that affect the amount of current in a circuit are voltage and resistance. If the voltage in a circuit is increased, according to Ohm's law, so is the current, providing the resistance doesn't change. On the other hand, if the resistance in a circuit is increased, the current is reduced.

For instance, if we consider a simple electric circuit with a battery and a light bulb. If the voltage of the battery is increased, more current will flow, and the light bulb will shine brighter. However, if the resistance (for example by adding another light bulb in series) is increased, less current will flow, and the bulbs will be dimmer.

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Sound travels fastest in _____.

Answers

Answer:

Sound travels fastest in solids

Explanation:

Sound is a type of mechanical waves. Mechanical waves are produced by the oscillations of the particles in the medium the wave is travelling through.

The speed of a mechanical wave depends on the density of the medium: the higher the density, the higher the speed. This is because in a medium with higher density, atoms/molecules are closer together, so they collide more frequently and therefore the wave can be transmitted faster and more efficiently.

Since solids have higher density than liquids and gases, this also means that mechanical waves (so, sound as well) travel faster in solids than liquids or gases.

Sound travels fastest in solids,than liquids, and faster in liquids, than in gases.

A child sliding down the slide at a park is an example ofA. positive acceleration
B. negative acceleration
C. no acceleration
D. velocity

Answers

C, no acceleration will occur because he is an object at rest

The amplitude of a transverse wave on a string is 3.0 cm. The ratio of the maximum particle speed to the speed of the wave is 3.9. What is the wavelength (in cm) of the wave?

Answers

Answer:

Therefore the wavelength of the particle is 4.83 m.

Explanation:

Transverse wave: A transverse wave is a moving wave whose direction of wave and oscillation are perpendicular to each other.

Amplitude:The amplitude of a wave is the maximum the distance from its rest position covered by a particle.

Here amplitude (A) = 3.0 cm

The ratio of maximum speed to the speed of the particle is 3.9

The maximum speed of the particle $C_(max)$ = A×ω

The speed of the particle C= f×λ

Then,

$(C_max)/(C) =(A* \omega)/(f* \lambda)$

$\Rightarrow (C_max)/(C) =(A* 2\pi * f)/(f* \lambda)$ [∵ω=2πf]

$\Rightarrow (C_max)/(C) =(A* 2\pi )/( \lambda)$

$\Rightarrow 3.9=(3* 2\pi )/( \lambda)$

$\Rightarrow \lambda=(3* 2\pi )/( 3.9)$

$\Rightarrow \lambda = 4.83$ m

Therefore the wavelength of the particle is 4.83 m

Which of the following countries was NOT an Axis power?A. Japan
B. Germany
C. Portugal
D. Italy

Answers

Portugal was not an axis power

What causes flaming combustion to occur?Select one:
a. A solid fuel mixes with an adequate amount of liquid fuel to be able to sustain an open burning flame.
b. A gaseous fuel mixes with an adequate amount of oxygen and heats to ignition temperature.
c. A solid fuel encounters an open flame and entrains enough air to ignite.
d. A gaseous fuel encounters an external heat source and experiences piloted ignition.

Answers

The option that is correct as regards flaming combustion from the question is A solid fuel mixes with an adequate amount of liquid fuel to be able to sustain an open burning flame.

Combustion can be regarded as exothermic redox chemical reaction which occurs at high temperature between fuel as well as an oxidant.

This oxidant is usually atmospheric oxygen, and the results are mixture of gases which do appear as smoke.

For this flaming combustion to occur, there should be mixture of solid fuel as well as liquid fuel so that the burning flame can be sustained.

Flaming combustion takes place when both visible flames as well as plume of a fire are visible.

Therefore, option A is correct.

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Answer is A(Soild Fuil

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