In the Bohr model of the atom, an electron in an orbit has a fixed ____.a. position
c. energy
b. color
d. size

Answers

Answer 1

Answer:

In the Bohr model of the atom, an electron in an orbit has a fixed energy in which it revolves.

What is an atom?

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

Learn more about atom,here:

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Answer 2

Answer: The answer is C. an electron in an orbit has a fixed energy.

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To prevent accidental poisoning, you should NOT __________.a. mix chemicals in well ventilated areas
b. follow the instructions on the label
c. keep materials in unlabeled containers
d. use chemicals in well ventilated areas

Answers

Answer: option C. keep materials in unlabeled containers.

Justification:

Indeed, keeping materials in unlabeled containers is a risky, dangerous, bad practice.

Labels should be according to international standards. That is, further to the name of the product, labels must signal the danger associated with the product: whether it is poison, toxic, flammable, acid, caustic, explosive, or harmful to the body or the enviroment.

On the other hand, the other options, a. mix chemicals in well ventilated areas, b. follow the instructions on the label, and d. use chemicals in well ventilated areas, are good safety practices, among many others.

Answer: C

Explanation:

Keep materials in unlabeled containers

Ice does not need to melt into liquid water before it can return to the atmosphere as water vapor.Please select the best answer from the choices provided
T
F

Answers

Answer: The given statement is true.

Explanation:

When solid state of water changes directly into vapor state then this process is known as sublimation.

For example, when dry ice is placed at room temperature then it converts into vapor state without undergoing liquid state.

Also when we apply very high pressure or temperature at the solid state of water, it will change directly into vapor state.

Therefore, the statement ice does not need to melt into liquid water before it can return to the atmosphere as water vapor is true.

True!
Because if it has a high pressure, it can skip the liquid phase. The process is called sublimation.

Determine the pressure change when a constant volume of gas at 2.50 atm is heated from 30.0 °C to 40.0 °C.

Answers

Answer:

The pressure changes from 2.50 atm to 2.58 atm (an increase of approximately 0.08 atm) when the gas is heated from 30.0°C to 40.0°C.

Explanation:

As the given volume of gas is constant, we can use Gay-Lussac's law to solve this problem as it relates pressure to temperature.

Gay-Lussac's law

$\boxed{\sf (P_1)/(T_1)=(P_2)/(T_2)}$

where:

P₁ = Initial pressure
T₁ = Initial temperature (in kelvins)
P₂ = Final pressure
T₂ = Final temperature (in kelvins)

First, we need to convert the given temperatures from Celsius to Kelvin by adding 273.15:

$\implies \sf T_1=30+273.15=303.15\;K$

$\implies \sf T_2=40+273.15=313.15\;K$

Therefore, the values to substitute into the equation are:

P₁ = 2.50 atm
T₁ = 303.15 K
T₂ = 313.15 K

As we are solving for the final pressure, rearrange the equation to isolate P₂:

$\sf P_2=(P_1T_2)/(T_1)$

Substitute the values into the equation and solve forP₂:

$\implies \sf P_2=(2.50 \cdot 313.15)/(303.15)$

$\implies \sf P_2=(782.875)/(303.15)$

$\implies \sf P_2=2.58246742...$

$\implies \sf P_2=2.58\;atm\;(3\;s.f.)$

Therefore, the pressure changes from 2.50 atm to 2.58 atm (an increase of approximately 0.08 atm) when the gas is heated from 30.0°C to 40.0°C.

Calculate the volume in mL of a 0.708 M KOH solution containing 0.098 mol of solute

Answers

Molarity = mol/liter

0.708M = 0.098mol/L
Rearrange to find L:
0.098mol/0.708M = .138L

For every liter there is 1000 mL:
.138L • 1000mL =138mL KOH

The process of chemical cycling is known as a biogeochemical cycle. Why was it called biogeochemical cycle? A. absorbs the chemical involved from the sediment. B. takes place over a long period of time. C. involves both living and nonliving components. D. withdraws the chemical from the atmosphere as a gas.

Answers

I think the correct answer from the choices listed above is option C. Biogeochemical cycle is termed as such because these cycles involves both living and nonliving components. These cycles are the carbon cycle, water cycle, nitrogen cycle, phosphorus cycle, oxygen cycle, sulfur cycle and rock cycle.

What is the relationship
between different forms of energy?

Answers

Answer:

Energy exists in different forms, all of which can be classified as either potential energy or kinetic energy. Potential energy is energy stored in an object due to its position or arrangement. Kinetic energy is energy of an object due to its movement - its motion.

Explanation: