Which is easier to observe the physical or chemical properties of an object? Support your answer with evidence

Answers

Answer 1

Answer:

It is easier to observe the physical properties than the chemical properties because they can be seen directly by the eyes, but to see the chemical properties, we have to perform chemical reactions.

What are physical and chemical properties?

Physical properties are those properties that can be seen by seeing the object. These properties are color, texture, density, boiling point, and melting point, etc. They are easier to check out with normal reactions than chemical properties.

Chemical properties are those properties that show the chemical areas of the element or the object. These areas are heat, pH, chemical reactivity and stability, etc.

Thus, the ability to directly view physical properties makes them easier to observe than chemical properties, which require humans to execute chemical reactions in order to see.

To learn more about physical and chemical properties, refer to the link:

brainly.com/question/24632287

#SPJ2

Answer 2

Answer: The physical properties because when it is physically changed you can identify the change. In chemical changes it sometimes deals with chemicals and stuff that include the breaking of bonds with another element.

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Which element has the lowest electronegativity? Calcium(Ca) Gallium(Ga) Selenium(Se) Bromine(Br)

Using enthalpies of formation, calculate H.

Answers

ΔH° = -851.5 kJ/mol given that

$\begin{array}{cc}\textbf{Species}&{\bf {\Delta H_f\textdegree{}}}\n \text{Fe}_2\text{O}_3\;(s) & -824.2\;\text{kJ}\cdot\text{mol}^(-1)\n\text{Al}_2\text{O}_3\;(s) & -1675.7\;\text{kJ}\cdot\text{mol}^(-1)\end{array}$

(Source: Chemistry Libretexts.)

Explanation

Refer to a thermodynamic data table for the standard enthalpy of formation for each species.

Don't be alerted if the data for Al (s) and Fe (s) are missing. Why?

The standard enthalpy of formation of a substance measures the ΔH required to form each mole of it from the most stable allotrope of its elements under STP.
Both Al (s) and Fe (s) are already the most stable form of their element under STP (note that the state symbol matters.) There's no need to form them again.

As a result, $\Delta H_f\textdegree{} = 0$ for both Al (s) and Fe (s).

$\displaystyle \Delta H_{\text{rxn}}\textdegree{} = \text{Sum of }\Delta H\text{ for all }\textbf{Product} - \text{Sum of }\Delta H\text{ for all }\textbf{Reactant}}\n\phantom{\Delta H_{\text{rxn}}\textdegree{}} = (1* \Delta H_f\textdegree{}(\text{Al}_2\text{O}_3\;(s)) + 1* \Delta H_f\textdegree{}(\text{Al}\;(s)) \n \phantom{\Delta H_{\text{rxn}}\textdegree{}=}-(1* \Delta H_f\textdegree{}(\text{Fe}_2\text{O}_3\;(s)) + 1*\Delta H_f\textdegree{}(\text{Fe}\;(s))$

$\Delta H_{\text{rxn}}\textdegree{}} = (1 * (-1675.7)) - (1*(-824.2)) = -851.5\;\text{kJ}\cdot\text{mol}^(-1)$ .

The number "1" here emphasizes that in case there are more than one mole of any species in one mole of the reaction, it will be necessary to multiply the $\Delta H_f\textdegree{}$ of that species with its coefficient in the equation.

What are the five senses of the human body?

Answers

Sight, Smell, Taste, Hearing, Touch

sight
hearing
taste
smell
touch

Solids are usually more dense than:1. gases
2. liquids
3. plasmas
4. all of the above

Answers

4.all of the above is the answer

Answer:

All of the above

Explanation:

Hopes this helps, let me know if it's not.

1. How would the world be like if the element named Boron did not exist? 2. How would our lives be if the element Boron did not exist?

Answers

1. The world without boron would be like a "turtle hiding inside it's shell" Almost everything that we need biologically would not be supplied. There would be plant disorder because of lack of boron that is needed for plants growth. And it would be widespread around the world and causes large of scarcity of food production resulting to chain of reaction to other factors that is part of our daily lives. We are not that high-tech as now and the transition of technology would not be as what we would be expecting in the years to come. We may obtain some of it naturally but it would not be enough later on as the population keeps on growing.

2. Life is still life because we still have other resources we need but it would be quite different as Boron plays a vital role since the earth's formation. As it has many uses in the beginning of civilization as we relies on borates for almost everything. Probably, widespread of plant disorder, poor production of food, rampant of sickness may happen, increasing of pestilence that some of the key ingredient of household products relies on it.

Making observations is the first step in the scientific method. Why don't scientists stop with the first step when creating an experiment? *14 points
A. Scientists don't stop with the first step of their experiment because they don't think that just using their observations is a very good place to start to prove their hypothesis.
B. Scientists don't stop with the first step of their experiment because they not only want to observe but they want to test their observations to be sure they are correct.
C. Scientists don't stop with the first step of their experiment because they want other scientists' opinions because they may not trust their own observations.
D. Scientists don't stop with the first step of their experiment because they would rather plan and run experiments than just observe the world around them.

Answers

D will be the answer I hope that help good luck I hope. My answer help you

1.The ___________ energy in a mechanical system is determined by adding the potential and kinetic energy together.

total
massive
2.
The initial ___________ energy is equal to zero because the starting point is set at zero height to make things easier.

kinetic
potential
3.
In the example, the final kinetic energy is determined to be ___________ because at the peak height, the ball instantaneously stops.

positive
zero
negative
4.
In this system, potential and kinetic energy are ________________ proportional.

inversely
directly

Answers

The system has an energy that can be conserved in the system, and when work is performed, the energy has been converted to working energy.

The following sentences can be completed as:

The total energy in a mechanical system is determined by adding the potential and kinetic energy together.

Total energy = Potential energy + Kinetic energy

The initial Kinetic energy is equal to zero because the starting point is set at zero height to make things easier.

In the example, the final kinetic energy is determined to be zero because, at the peak height, the ball instantaneously stops.

In this system, potential and kinetic energy are inversely proportional.

For more information about kinetic and potential energy, refer to the link:

brainly.com/question/22228414

Answer:

1)total, 2)potential, 3)zero, 4)inversely.

Explanation:

1) The total energy in a mechanical system is determined by adding the potential and kinetic energy together.

2) The initial potential energy is equal to zero because the starting point is set at zero height to make things easier.

3) In the example, the final kinetic energy is determined to be zero because at the peak height, the ball instantaneously stops.

4) In this system, potential and kinetic energy are inversely proportional.

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