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denis-greek [22]
2 years ago
10

2 When enough heat is added to liquid water, it boils, and bubbles of water vapor rise to the surface and into the air. Which ty

pe of change is this and why? A. a chemical change, because gas is produced B. a chemical change because heat is produced C. a physical change because the identity of the substance changes D. a physical change because the substance changes state.3
4. A sample of aluminum has a volume of 3.0 cm3 and a mass of 8.1 g. Which is the density of aluminum?
A. 2.7 g/cm3
B. 5.1 g
C. 11.l cm3
D. 24.3 g/cm3

I only need two question fast
Chemistry
1 answer:
Molodets [167]2 years ago
6 0

Answer:

In the first paragraph, name a theme of Paul Laurence Dunbar's poem "Sympathy," and explain how it develops, citing specific examples

Explanation:

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Opal is a hydrated form of silica. If a laboratory analysis of a sample of opal reveals it to contain29.2% Si, 33.3%O, and 37.5%
ZanzabumX [31]
Let us assume that there is a 100g sample of Opal. The masses of each element will be:
29.2g Si
33.3g O
37.5g H2O
Now we divide each constituent's mass by its Mr to get the moles present
Si: (29.2 / 28) = 1.04
O: (33.3 / 16) = 2.08
H2O: (37.5 / 18) = 2.08
Now we divide by the smallest number and obtain:
Si: 1
O: 2
H2O: 2
Thus, the empirical formula of Opal is:
SiO2 . 2H2O
8 0
3 years ago
What happens when sodium trioxocarbonate (IV) decahydrate is heated
PSYCHO15rus [73]

Answer:

the simplest answer is it loses the water (decahydrate) because it evaporates

5 0
2 years ago
Light is released when an excited electron moves from higher energy level back down to its lower, more stable energy level. The
podryga [215]
<span>The light spectrum that results from the light produced by an excited electron moving from a higher energy level back down to a lower energy level is an emission spectrum. The emission spectrum is formed by the electromagnetic radiation released by the transition in energy state.</span>
7 0
3 years ago
Read 2 more answers
In Universe , recently discovered by an intrepid team of chemists who also happen to have studied interdimensional travel, quant
tiny-mole [99]

Answer:

Check the explanation

Explanation:

When talking about our universe there are 5 d orbitals. The element of first transition series moves away from the universal principles of Hund's rule and Aufbav's principle. So in order to attain stability these elements tend to form half or full filled orbitals.

In our universe the ground state electronic configuration of sixth transition metal, Iron (Fe) :  [Ar] 3d^{6} 4s^{2}

and the electronic configuration of seventh transition metal, Cobalt (Co) :  [Ar] 3d^{7} 4s^{2}

=================================

=================================

In universe L there are seven orbitals.

Ground state electronic configuration of sixth and seven transition element.

Sixth transition metal: [Ar] 3d^{7} 4s^1 or [X] 3d^{7} 4s^1

Seventh transition metal: [Ar] 3d^{7} 4s^{2}or [X] 3d^{7} 4s^{2}

7 0
3 years ago
When cyclohexene is treated with KMnO4, H2O, the syn-1,2-diol is produced. What reaction occurs when benzene is similarly treate
Ulleksa [173]

Answer:

No reaction is observed

Explanation:

The benzene ring is aromatic. Being an aromatic ring, the benzene ring is remarkably stable to all reactions that destroy the aromatic ring.

Alkenes are oxidized to alkanols in the presence of KMnO4 but this reaction does not occur with benzene. However, substituted benzenes having hydrogen atoms attached to the substituent carbon atom can be oxidized to the corresponding carboxylic acid.

7 0
3 years ago
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