What does physical change mean?

Answers

Answer 1

Answer: Physical change means - a change from one state ( solid,liquid or gas) to another state without change in chemical composition.

Answer 2

Answer: Physical change is when no new substances are formed. If there is a chemical substance then physical changes takes affect to its form, but not its chemical composition. Hope this helps.

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The vapor pressure of a liquid is 0.92 atm at 60°C. The normal boiling point of the liquid could be(1) 35°C (3) 55°C(2) 45°C (4) 65°C
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Select all that apply to the property of hardness.Hardness is a physical property
Hardness is indicative of the strength of chemical bonds between elements.
Hardness is determined through a complicated process that requires expensive instruments.
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.

Answers

The correct statements are:

Hardness is a physical property
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.

Answer:The properties of the Hardness are:

Hardness is a physical property
Hardness is indicative of the strength of chemical bonds between elements.
Diamond can scratch quartzExplanation:

Hardness is defined as resistance offered by a material when subjected to any kind of mechanical effort.It is a physical property

Hardness of a materiel indicates its strength that strength of its chemical bond between the atoms and their arrangement in space.

Mohs scale is a scale which measures the hardness of the materiel from 1 to 10. Materiel with higher Mohs scale number will able to scratch materiel with lower Mohs scale score.

The properties of the Hardness are:

Hardness is a physical property

Hardness is indicative of the strength of chemical bonds between elements.

Diamond can scratch quartz.

a 15.5g sample of x combine with 42.5g of y to from the compound XY3 what are the mass of reactant and product

Answers

Explanation:

Given parameters:

Mass of sample X = 15.5g

Mass of sample Y = 42.5g

Unknown:

Mass of reactant and product = ?

Solution:

We can solve this problem by applying the law of conservation of mass. The law states that "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another".

We expect that the sum of the mass of the reactant will be equal to that of the product;

Mass of reactant = mass of X + mass of Y = 15.5g + 42.5g = 58g

So, mass of XY₃ = 58g

What is the mass in grams of 1.73 moles CaH2

Answers

mass in grams = no. of moles multiply by molar mass
molar mass is 42 so by putting value we get 72.66 grams...

Occurs when the moon moves between the Earth and Sun and blocks the light

Answers

A Solar Eclipse happens when the moon is between Earth and the sun.

Butyric acid is responsible for the odor in rancid butter. A solution of 0.25 m butyric acid has a ph of 2.71. What is the ka for the acid?

Answers

Answer:

Ka = 1.5 -10^-5

Explanation:

Step 1: Data given

Molarity of the solution = 0.25 M

pH = 2.71

Step 2 The equation

C3H7COOH + NaOH ⇆ C3H7COONa + H2O

Step 3: Calculate pKa

pH = (pKa-log[acid])/2

2pH = pKa -log[acid]

pKa = 2pH +log[acid]

⇒with pH = 2.71

⇒with log[acid] = -0.60

pKa=2*2.71 -0.60

pKa = 5.42 - 0.60

pKa = 4.82

Step 4: Calculate Ka

pKa = -log(Ka)

Ka = 10^-4.82

Ka = 1.5 -10^-5

How does thermal energy travel?

Answers

Thermal energy travels by conduction, convection, and radiation. It occurs when a cooler and warmer object touches each other.

Thermal energy travels by conduction, convection, and radiation. Conduction occurs when two or more objects of different temperatures are touching each other. The heat flows from the warmer object to the cooler object, until the objects reach equal temperatures.
I hope this helps! :)

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