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blsea [12.9K]
3 years ago
15

1. The underlined portion of the chemical formula above is the _____ and it represents ____________________.

Chemistry
2 answers:
Mnenie [13.5K]3 years ago
3 0

1.Subscript,how many hydrogen molecules there are

2.No it is not balanced,oxygen is less than represented.

Allushta [10]3 years ago
3 0

1. The correct answer is B. Subscript; how many hydrogen molecules which are there  in that one molecule.

Chemical formula above is a superscript and it represents hydrogen molecules in one molecule.

2. The correct answer is C. No, the equation is not balanced. In the equation the oxygen it has less atoms which represents the products.

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. A dough that is high in fat and sugar, and sometimes eggs.
murzikaleks [220]

Answer:

LEAN DOUGHS

Explanation:

A lean dough is a dough low in fat and sugar. Hard crust breads and rolls such as French and Italian breads and pizza crusts. Other white and whole wheat breads and dinner rolls. These are higher in fat and sugar and sometimes contain eggs and milk solids, because they are richer, they have a softer crust.

3 0
3 years ago
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What kind of change is heating of mercuric oxide? ​
mario62 [17]

Answer:

Chemical change.

Explanation:

When it is heated it decomposes into mercury and oxygen gas. The mercury oxide reactant becomes the silver color of mercury. Hence, a color change can be noticed throughout the reaction.

7 0
3 years ago
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An unknown compound contains 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. what is the empirical formula of this compound
Softa [21]

Answer: Ca3(PO4)2

Explanation:

  • We assume that the sample is 100.0 g.
  • The sample contains 38.7 g of Ca, 19.9 g of P, and 41.2 g of O as the proportions show.
  • Then we can calculate the number of moles of each component (n = m/atomic mass).
  • The number of moles of Ca = 38.7/40.078 = 0.96 mol.
  • The number of moles of P = 19.9/30.97 = 0.64 mol.
  • The number of moles of O = 41.2/15.99 = 2.75 mol.
  • Now, we can get the molar ratios of different components (Ca, P, and O) in the sample by dividing the number of moles of each component by the lower number of moles, that we should divide the number of moles by (0.64).
  • Ca: P: O = (0.96/0.64) : (0.64/0.64) : (2.75/0.64) = 1.5 : 1 : 4.
  • To avoid the fraction of the ratios, we can multiply all ratios by 2.0.
  • Now, the ratio of Ca : P : O will be 3 : 2 : 8.
  • That main the empirical formula of the compound is Ca3P2O8 which can be expressed as calcium phosphate (Ca3(PO4)2).
8 0
3 years ago
An isotope contains 47 protons, 47 electrons, and 60 neutrons. What is the identity ok the isotope.
Gekata [30.6K]

Answer is: the identity of the isotope is silver (Ag-107).

p⁺(isotope) = 47; number of protons in isotope.

Z = p⁺; atomic number.

Atomic number is the number of protons, which is characteristic of a chemical element, silver is an element with atomic number 47.

n°(isotope) = 60; number of neutrons in isotope.

A = p⁺ + n°; mass number is the total number of protons and neutrons in a nucleus.

A = 47 + 60.

A = 107.

6 0
3 years ago
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Which statement defines activation energy?​
ehidna [41]

Answer:

The statement which defines activation energy is that it is the difference between reactant energy and maximum energy.J

Explanation:

A reaction that does not have activation energy will not take place at all.

3 0
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