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3 years ago

Which statement describes a scientific theory?

2 answers:

7 0

Best Answer
C) is the best description, although a scientific theory is not necessarily a "fact". They are, however, based on evidence.

A) is complete garbage.

B) is a good description of a scientific "law"- something that predicts how a certain event will occur without explaining why this is (for instance, the law of gravity accurately describes the gravitational forces between two bodies, but does not explain why these forces are there).

D) is a scientific "hypothesis"- an explanation for an observed phenomena that is yet to be proven.

anyanavicka [17]3 years ago

5 0

The correct statement is C) A theory changes based on new observations and testing.

<h3>FURTHER EXPLANATION</h3>

A) A theory states how something behaves without explaining why.

FALSE because a theory is actually a statement that explains why an observed phenomenon happens. A statement or an observation of how something behaves without explanation is a scientific law, not a theory.

B) A theory is a proven fact that cannot be changed.

FALSE because a theory may be changed or proven false if new evidence that contradicts or debunks the existing theory comes to light. An example is the development from Classical Mechanics to Special Relativity to the Theory of General Relativity with each subsequent theory providing explanations to situations the preceding could not.

C) A theory changes based on new observations and testing.

TRUE because a theory is only valid when a lot of data support it. If new observations challenge the theory, then it may be changed or abandoned.

D) A theory is based on a single hypothesis or observation.

FALSE because a theory is considered as the best explanation for a phenomenon so far. For it to be considered the “best” it has to have been peer-reviewed and repeatedly tested and verified by the scientific community.

<h3>LEARN MORE</h3>

hypothesis brainly.com/question/2681563
scientific method brainly.com/question/550083
scientific law brainly.com/question/942536

Keywords: theory, scientific method

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The ksp of calcium carbonate, caco3, is 3.36 × 10-9 m2. calculate the solubility of this compound in g/l.

maw [93]

CaCO₃ partially dissociates in water as Ca²⁺ and CO₃²⁻. The balanced equation is,
CaCO₃(s) ⇄ Ca²⁺(aq) + CO₃²⁻(aq)
Initial Y - -
Change -X +X +X
Equilibrium Y-X X X

Ksp for the CaCO₃(s) is 3.36 x 10⁻⁹ M²

Ksp = [Ca²⁺(aq)][CO₃²⁻(aq)]
3.36 x 10⁻⁹ M² = X * X
3.36 x 10⁻⁹ M² = X²
X = 5.79 x 10⁻⁵ M

Hence the solubility of CaCO₃(s) = 5.79 x 10⁻⁵ M
= 5.79 x 10⁻⁵ mol/L

Molar mass of CaCO₃ = 100 g mol⁻¹

Hence the solubility of CaCO₃ = 5.79 x 10⁻⁵ mol/L x 100 g mol⁻¹
= 5.79 x 10⁻³ g/L

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3 years ago

Science 7 Grade 7. Can anyone please help me answer these science questions?

masha68 [24]

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2 years ago

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Galina-37 [17]

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3 years ago

Write an equation for the reaction that takes place during the laboratory preparation of dry hydrogen

olya-2409 [2.1K]

Answer:

Zn+2HCl→ZnCl2+H2

Explanation:

Hydrogen gas is prepared in the laboratory by reacting dilute HCl with granulated zinc.

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3 years ago

The thermite reaction reacts iron (III) oxide, Fe2O3, with aluminium powder,Al, the form aluminium oxide, Al2O3 and iron, Fe.

lara [203]

Answer:

<u><em>This answer assumes that the strated "16.0g of iron" was meant to be 16.0 grams of iron(III) oxide.</em></u>

Explanation:

To start, the thermite equation must be balanced.

I find:

1Fe2O3 + 2Al = 1Al2O3 + 2Fe

This tells us we need 2 moles of Al for every 1 mole of Fe2O3.

Now calculate the moles of each reactant:

Moles Fe2O3: 16.0 g/159.7 g/mole = <u>0.100 moles Fe2O3</u>

Moles Al: 8.1 /26.98 g/mole = <u>0.300 moles Al</u>

The balanced equation says that in order to react all of the Fe2O3 we'd need twice that amount (in moles) of the Al. (0.100 moles Fe2O3)*(2) = 0.200 moles Al.

<u>Which of the two reactants is the limiting reagent?</u>

We have more than enough moles of Al to react with 0.10 moles of Fe2O3. (We have 0.300 moles Al and all we need is 0.200 moles to react with the 0.10 moles of Fe2O3. <em>Fe2O3 is the limiting reagent.</em>

<u><em>Calculate the maximum mass of iron of iron that could be formed using these quantities of reactants.</em></u>

The balanced equation tells us that we will obtain 2 moles of Fe for every 1 mole of Fe2O3 consumed. Since Fe2O3 is the limiting reagent, we will assume that it completely reacts. That means 0.1 moles of Fe2O3 is reacted. Since we expect twice that many moles of Fe, we should obtain 0.200 moles of Fe. At 55.85 g/mole, we should obtain:

(0.200 moles Fe)*(55.85 g Fe/mole Fe) = 11.2 grams Fe

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1 year ago