CHEMISTRY HIGH SCHOOL

Density is a measure of an object's _____ per unit _____.

Answers

Answer 1
Answer: Density is a measure of an object's mass per unit volume.

I hope you have a wonderful day! :D
Answer 2
Answer: Density is a mesjre of an objects mass per u it volume

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Which statement describes a chemical propertyof sodium?(1) Sodium has a melting point of 371 K.(2) Sodium has a molar mass of 23 grams.(3) Sodium can conduct electricity in the liquidphase.(4) Sodium can combine with chlorine to producea salt.
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Which of the following statements describes a scientific law?a. A scientific law explains a set of events.
b. A scientific law describes what occurs every time in a situation.
c. A scientific law is constantly modified.
d. A scientific law is developed without experimentation.

Answers

The correct answer is B.

scientific law which describes what occurs every time in a situation. Scientific law always applies under same condition.


Laws differs from scientific theory because they does not posit explanation of phenomena.

Different laws takes mathematical forms. Scientific law is being associated with natural science but social sciences also contains laws.


A good example of scientific law in social sciences is Zipf's law.

Answer:

B. a law is a proven fact that cannot be changed.

Explanation:

Bromine, a liquid at room temperature has a boiling point of 58 degrees celsius and a melting point at -7.2 degree celsius bromine can be classified as a

Answers

Hello!


Bromine can be classified as a pure substance.


Why?


Bromine is an element with atomic number 35 on group 17 of the Periodic Table. That's the first sign that shows us that it is a pure substance.


But the fact that it has a clear and defined boiling and melting point is a sign that we are in the presence of a pure substance. Pure substances are characterized by defined boiling and melting points.


Mixtures usually have a range of temperatures in which they melt and boil.


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Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding? a. The valence electrons are easily delocalized.
b. The valence electrons stay in a single orbital.
c. The valence electrons break free of the crystals.
d. The valence electrons move closer to the nuclei.

Answers

Answer: The valence electrons are easily delocalized. As the ionization energy increases the energy required to remove the valance electrons from the atom also increases. So the valance electrons move closer to the nuclei. But low ionization energy makes the atom to lose valance electrons much easier.

Answer: THE answer is A

Explanation: took the exam

Which observation illustrates the law of conservation of mass?a. Burning 10 g of propane produces twice as much carbon dioxide as burning 5 g of propane.
b. The C:O mass ratio of one compound is exactly double that of another compound.
c. When 3 g of carbon reacts with 8 g of oxygen, 11 g of carbon dioxide is produced.
d. The C:O mass ratio of a particular compound is the same, regardless of the size or source of the sample.

Answers

I believe that the answer is C. 

Number of protons in uranium 340

Answers

Answer:

it is 92

Explanation:

Atomic Mass 238.029 atomic mass units

Number of Protons 92

Number of Neutrons 146

Number of Electrons 92

Answer:

92

Explanation:

because it is the 92nd element on the table it has 92 protons

Given the speed of light (3.00 × 108 m/s) and a wavelength 5.9 × 10-7 m, what is the frequency?

Answers

Wavelength x Frequency = Speed

So, 5.9 x 10^-7 x F = 3 x 10^8

Rearranging the equation, we get:
F = (3 x 10^8)/(5.9 x 10^-7) = 5.08 x 10^14 Hz

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