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solniwko [45]
3 years ago
5

Which of the following is a chemical change?

Chemistry
1 answer:
ValentinkaMS [17]3 years ago
4 0
Answer: A - it is changing into a new substance

the other answers are just physical changes
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7 g of table salt is add to water in a dish. The dish is then heated until all the water evaporates. Assuming no chemical reacti
Aleks04 [339]

Answer:

7 grams

Explanation:

The water evaporates leaving the same amount of salt behind

hope this helps...

8 0
3 years ago
which periodic trend quantifies the amount of energy required to remove an electron from a neutral, gaseous atom? a) atomic radi
ahrayia [7]

Ionization energy is the energy needed to remove one electron from an atom in the gaseous state.

Ionization energy (IE) is the force needed to ionize a neutral atom or cation when it is in its gaseous state. Ionization potential is another name for IE. Ionization energy is conceptually defined as an element's affinity for its outermost electron (an electron it already has in its valence shell).

The least amount of energy needed to ionize an atom is needed to remove an electron from its ground state. Across the periodic table, there is a regular increase in ionization energy from top to bottom and left to right.

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5 0
2 years ago
How much do 15.26 moles of silver weigh in grams? Enter a number.
galina1969 [7]
15.26 miles of silver is 0.1414689408 grams
7 0
3 years ago
Read 2 more answers
Balance the equation in acidic conditions. phases are optional. equation: cu no_{3}^{-} -> cu^{2 } no cu no−3⟶cu2 no
d1i1m1o1n [39]

Cu + 2NO₃⁻  + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O this is the balanced chemical equation in acidic medium.

<h3>What is Balanced Chemical Equation ?</h3>

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the given equation

Cu + NO₃⁻ → Cu⁺² + NO₂

Here we can see that all atoms other than O and H are balanced.

In the given equation oxidation number of Cu changes from 0 to +2.

In the given equation oxidation number of N changes from 5 to 4.

Now multiply by 2 with NO₃⁻ and NO₂.

Cu + 2NO₃⁻ → Cu⁺² + 2NO₂

Now ad the water molecules in right hand side to balanced the O atoms.

Cu + 2NO₃⁻  → Cu⁺² + 2NO₂ + 2H₂O

Now add 4H⁺ on the left hand side to balance the H atoms.

Cu + 2NO₃⁻  + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O

Thus from the above conclusion we can say that Cu + 2NO₃⁻  + 4H⁺ → Cu⁺² + 2NO₂ + 2H₂O this is the balanced chemical equation in acidic medium.

Learn more about the Balanced Chemical Equation here: brainly.com/question/26694427

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8 0
2 years ago
if the central atom in a molecule is sp3 hybridized, how many different electronic geometries can it have?
jekas [21]

Tetrahedral molecular geometry is the only one that can exist for sp3 hybridized center atoms.

<h3>Which chemical contains an sp3 hybridized central atom?</h3>
  • An atom that is bound and a nonponding pair of electrons are the two different kinds of electron domains.All bonded atoms count as one electron domain on the center atom, regardless of whether they are connected by a single, double, or triple bond.
  • There are five fundamental geometries for electron domains. The core oxygen atom in the water molecule has six valence electrons.The 6 valence electrons of oxygen are arranged in hybridized sp3 orbitals, resulting in 2 paired and 2 free electrons.
  • One s orbital and three p orbitals combine to generate four sp3 orbitals, each of which has a 25% s character and a 75% p character. This process is known as sp3 hybridization.
  • An example of CO2 can be used to illustrate how lone pairs of electrons make up an SP3 hybrid orbital.We are only able to count bond pairs or lone bonds.

To learn more about sp3 refer

brainly.com/question/28359475

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6 0
1 year ago
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