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leonid [27]
3 years ago
12

Which of the following observations NOT likely describes a chemical change? a A white solid was exposed to ultraviolet light and

turned brown. b Two clear liquids were mixed together and a yellow solid formed c A solid was added to water and the mixture was stirred until the solid was no longer visible d A piece of metal was added to a liquid and bubbles formed on the surface of the metal
Chemistry
1 answer:
kiruha [24]3 years ago
7 0

Answer:

The correct answer would be - c.  A solid was added to water and the mixture was stirred until the solid was no longer visible

Explanation:

Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.

when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.

When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.

Thus, the correct answer is option C.

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PLSSSSSSSS help !!!!! One mole of an element contains which of the following?
irina [24]

Answer:

6.02 × 10²³ atoms

Explanation:

The number 6.02 × 10²³ is called Avogadro number. It is the number of atoms,  ions and molecules in one gram atoms of an element, one gram ions of substance and one gram molecule of a compound.

For example:

32 g of oxygen = one mole = 6.02 × 10²³  atoms O.

1.008 g of hydrogen = one mole = 6.02 × 10²³  atoms of H.

or

18 g of H₂O =one mole = 6.02 × 10²³  molecules of H₂O

44 g of CO₂ = one mole = 6.02 × 10²³  molecules of CO₂

or

62 g of NO₃⁻ = one mole of NO₃⁻ = 6.02 × 10²³  ions of NO₃⁻

5 0
3 years ago
What are some ways a child could make money?<br> (pls help this is part of school)
Damm [24]

Answer:

you could get a job if you are of age if not ask your parents if you could do chores for allowance

5 0
3 years ago
If zinc has an atomic number of 30 and a mass number of 65 what is the correct number of protons neutrons and electrons ?
ioda

Answer:

Explanation:

Name                 Zinc

Atomic Mass            65.39 atomic mass units

Number of Protons   30

Number of Neutrons      35

Number of Electrons      30

4 0
3 years ago
Read 2 more answers
What happens when an electron falls to a lower energy level?
olasank [31]
The electron releases energy.
4 0
3 years ago
you have an object with mass of 86 g and volume of 10 cm^3 (cubed). calculate density, show your work, and identify which materi
sleet_krkn [62]

Answer:

8.6g/cm³ (BRASS)

Explanation:

Given the following :

Mass of object = 86g

Volume of object = 10cm³

The density of an object is calculated using the formula :

Density(g/cm³) = mass(g) / volume(cm³)

Inputting our values :

Density = 86g / 10cm³

Density = 8.6g/cm³

According to the table provided, the object which corresponds to having a density of 8.6g/cm³ is BRASS

6 0
3 years ago
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