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vivado [14]
3 years ago
13

Which phrase describes a scientific theory?

Chemistry
1 answer:
torisob [31]3 years ago
3 0

Answer:

C

Explanation:

Answer: C. A thoroughly tested and widely accepted explanation. Explanation: A scientific theory is a coherent statement or set of ideas that explains observed facts or phenomenon and are thoroughly tested and widely accepted.

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Explain why iron sulfide has different properties from a physical mixture of the elements iron and sulfur?
Ulleksa [173]
"Iron and sulfur are both elements from the periodic table of elements.  As such, each one has its own unique set of physical and chemical properties.  Iron is a metal, while sulfur is a nonmetal.  When these two are heated together, the iron atoms combine with the sulfur atoms to make a compound known as iron sulphide.  A compound is different from elements in that it is made from the chemical union of two or more elements.  Iron sulphide is not iron or sulfur; it is a pure substance with its own set of distinguishing physical and chemical characteristics.  A mixture, on the other hand, is what you get by combining two or more elements, but not chemically combining them.  In the case of the iron and the sulfur, if you mix them and provide no heat, you simply have a mixture of iron and sulfur.  Mixtures are different from compounds in that they are easily separated.  A magnet could be used to separate the iron from the sulfur, because iron is attracted to magnets, while sulfur is not." https://www.enotes.com/homework-help/explain-why-iron-sulphide-compound-not-just-336735 - I hope this helps! :)
3 0
3 years ago
Read 2 more answers
"How many grams of CaCl2 would be dissolved in 1.0 L of a 0.10 M solution of CaCl2? "
lukranit [14]

Answer:

2365 g

Explanation:

6 0
3 years ago
The thermal stability of group 2 hydroxides increases down the group ? give reasons​
VladimirAG [237]

ANSWERS:

Group 2 metal carbonates, nitrates and hydroxides decompose to heat to give the corresponding metal oxide and release CO2, NO2 and O2, and H2O respectively. The thermal stability increases down the group as theionic character of the compounds increases down the group.

3 0
3 years ago
The number of grams of H2 in 1470 mL of H2 gas. ​
Lorico [155]

Answer:

0.1313 g.

Explanation:

  • It is known that at STP, 1.0 mole of ideal gas occupies 22.4 L.
  • Suppose that hydrogen behaves ideally and at STP conditions.

<u><em>Using cross multiplication:</em></u>

1.0 mol of hydrogen occupies → 22.4 L.

??? mol of hydrogen occupies → 1.47 L.

∴ The no. of moles of hydrogen that occupies 1.47 L = (1.0 mol)(1.47 L)/(22.4 L) = 6.563 x 10⁻² mol.

  • Now, we can get the no. of grams of hydrogen in 6.563 x 10⁻² mol:

<em>The no. of grams of hydrogen = no. of hydrogen moles x molar mass of hydrogen</em> = (6.563 x 10⁻² mol)(2.0 g/mol) = <em>0.1313 g.</em>

5 0
2 years ago
Why is a lot of energy needed to break covalent bonds
gulaghasi [49]

Answer:

The strength of a bond between two atoms increases as the number of electron pairs in the bond increases.

Explanation:

6 0
2 years ago
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