Forces and Motion:Question 2A student pushes a box to slide it across the floor. Which statement best explains why the box begins
to move?
Select one:
0 The weight of the box is less than the force of friction.
O
The weight of the box is greater than the force of friction.
The applied force is greater than the force of friction.
O
The applied force is less than the force of friction

Answers

Answer 1

Answer:

Answer:

the applied force is less than the force of friction.

Explanation:

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methane and hydrogen sulfide form when hydrogen reacts with carbon disulfide. identify the excess reactant and calculate how much remains after 36 L o fH2 reacts with 12 L of CS2 all at STP
This element has a complete outermost energy level and is found in the 4th period.
What happens when atoms of uranium split apart __?
Which of these elements has an electron configuration of [Kr]5s2?barium calcium rubidium strontium
21 Which mathematical expression represents the heat of reaction for a chemical reaction?(1) (the heat of fusion) – (the heat of vaporization)(2) (the heat of vaporization) – (the heat of fusion)(3) (the potential energy of the products) – (the potential energy of the reactants)(4) (the potential energy of the reactants) – (the potential energy of the products)

Describe the conditions under which a real gas is most likely to behave ideally

Answers

Answer:

The conditions under which a real gas is most likely to behave ideally is at low pressure and hight temperatures.

Explanation:

According to molecular kinetic theory, 1) gas particles (molecules or atoms) occupy a negligible fraction of the total volume of the gas, and 2) the force of attraction between gas molecules is zero.

Those two assumptions constitute the basis for the behavior of a gas and an ideal gas.

The lower the pressure and the higher the temperature the closer those assumptions are valid for real gases.

At low pressure, the particles of the gas will be more separated from each other and so the tiny volume they occupy will be a smaller fraction of the total volume.

At higher temperatures, the particles will have more kinetic energy, which means that they will have larger average speed, and so the forces between the molecules will count less.

So, you conclude that under low pressure and high temperatures a real gas is most likely to behave ideally.

Consider the equation below. Zn + H2SO4 mc010-1.jpg ZnSO4 + H2 The mole ratio of zinc to zinc sulfate is

Answers

Answer: The mole ratio of zinc to zinc sulfate is 1:1.

Explanation:

$Zn+ H_2SO_4\rightarrow ZnSO_4+H_2$

According to reaction,1 mole of zinc reacts with 1 mole of sulfuric acid to give 1 mole zinc sulfate and 1 mole of hydrogen gas .

So, the mole ratio of zinc to zinc sulfate is:

$\text{moles of}Zn:\text{moles of}ZnSO_4=1 mol:1 mol=1:1$

Hence, the mole ratio of zinc to zinc sulfate is 1:1.

Zn=65 grams/mole
20 grams/ (65 grams/mole)=0.31 moles of zinc
The molar ratio of Zn and H2 is 1 to 1, so 0.31 moles of H2 are also produced. The ratio is the same for the sulfuric acid. H2SO4=2*1+32+16*4=98 grams/mole
(98 grams/mole)*0.31 moles=30.4 grams of H2SO4.

a car traveling at 20 m/s starts to decelerate steadily it comes to a complete stop in 10s .what is its acceleration

Answers

A car traveling at 20 m/s starts to decelerate steadily it comes to a complete stop in 10s. The equation for the acceleration is velocity divided by time. So divide 20 m/s by 10 s and you will get an acceleration of 2 m/s2.

The of an element is the total number of protons and neutrons in the______________________ of the atom.

Answers

the nucleus of the atom ....

Why can liquid metal be poured into a block-shaped mold?Describe what happens to the shape and volume of the liquid
metal.

Answers

Answer:

yes

Explanation:

because

3 In the wave-mechanical model of the atom, an orbital is defined as(1) a region of the most probable proton location
(2) a region of the most probable electron location
(3) a circular path traveled by a proton around the nucleus
(4) a circular path traveled by an electron around the nucleus

Answers

(2) a region of the most probably electron location. The rest are all false. (1) and (3) are false obviously, because it denotes the location for the proton, which is in the nucleus, and protons don't travel around the nucleus, they are the nucleus, at least a part of it. (4) a circular path traveled by an electron around the nucleus is false because although there are s orbitals which have a spherical shape around the nucleus in its electron shell, it does not mean it travels circularly around the nucleus, nor does it mean it is the only type of orbital shape.

In wave mechanical model an orbital is defined as $\boxed{\left( {\text{2}} \right){\text{region of most probable electron location}}}{\text{.}}$

Further explanation:

Bohr's model could not account for duality of matter and also contradicted the Heisenberg uncertainty principle. To overcome these weaknesses, a wave mechanical model was developed. The basis of this model was the Schrodinger wave equation of hydrogen atom.

The salient features of the wave mechanical or quantum mechanical model are as follows:

A. The energy associated with electrons present in atoms can take only certain discrete values. This is known as the quantization of energy.

B. Such quantized energy levels are a consequence of wave characteristics of electrons and allowed values are dictated in accordance with the solutions obtained from the Schrödinger wave equation.

C. The exact position as well the velocity of an electron cannot be precisely determined as it obeys the Heisenberg’s uncertainty principle. This leads to an important concept that path of an electron can never be precisely defined. Therefore it is better to use the term probability of locating electron.

D. The region of space around the atom in which the probability of locating any electron is highest is known as the orbital. The physical significance of the orbital is that it can be described using the values of ${\psi }}$ . There are several possible values of ${\psi }}$ . as can be obtained from the solving of Schrodinger equation. So there are several numbers of orbitals associated with an electron.

E. The utility of ${\psi }}$ is that its square ${\left| {\mathbf{\psi }} \right|^{\mathbf{2}}}$ is directly proportional to the probability of locating an electron at a point within an atom. Hence the orbital is not a circular region of space but a region where the probability of locating an electron is highest.

Therefore, in the wave-mechanical model of the atom, a region of the most probable location is defined as orbital. Hence, the correct option is $\left( {\text{2}} \right)$ .

Learn more:

1. Calculation of volume of gas: brainly.com/question/3636135

2. Determine how many moles of water produce: brainly.com/question/1405182

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Bohr theory and quantum chemistry

Keywords: Wave mechanical model, Bohr model, wave mechanical model, Heisenberg’s uncertainty principle, Physical significance, orbital, Schrödinger wave equation and probability

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