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3 years ago

All the noble gases have similar chemical properties. True or false?

Chemistry

1 answer:

zhenek [66]3 years ago

3 0

<span>True , all noble gases have filled outer electron shells, and are nonreactive with other atoms.</span>

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What molecule is responsible for chemical digestion.

padilas [110]

Answer:

Amylase.

Explanation:

The process of digestion begin to start in mouth when food mix with saliva. An enzyme is released which is called Amylase help in digestion of carbohydrates.

8 0

3 years ago

The K sp for barium fluoride, BaF2, is 2.45 × 10-5. What is the molar solubility of barium fluoride?

lilavasa [31]

Answer: The molar solubility of barium fluoride is 0.0183 moles/liter.

Explanation:

The equation for the reaction will be as follows:

$BaF_2\rightarrow Ba^{2+}+2F^$

By Stoichiometry,

1 mole of $BaF_2$ gives 2 moles of $F^-$ and 1 mole of $Ba^{2+}$

Thus if solubility of $BaF_2$ is s moles/liter, solubility of $Ba^{2+}$ is s moles/liter and solubility of $F^-$ is 2s moles/liter

Therefore,

$K_sp=[Ba^{2+}][F^{-}]^2$

$2.45\times 10^{-5}=[s][2s]^2$

$4s^3=2.45\times 10^{-5}$

$s^3=6.12\times 10^{-6}moles/liter$

$s=0.0183moles/liter$

Thus the molar solubility of barium fluoride is 0.0183 moles/liter.

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4 years ago

Bicycles that have been left outside in the summer will rust faster than bicycles kept inside. What causes the bicycles that are

professor190 [17]

Bikes that are kept outside are not used as often, speeding up the chemical reaction of metal rusting.
Heat energy from the sun slows down the chemical reaction of the metal rusting.
Moisture and oxygen cause oxidation, which speeds up the chemical reaction of the metal rusting.
Wind energy outside speeds up the chemical reaction of the metal rusting.

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3 years ago

What is the approximate age of the oldest fossils of early human ancestors?

Vesna [10]

Answer:approx 300,000 years ago

Explanation:

Fossils attributed to H. sapiens, along with stone tools, dated to approximately 300,000 years ago, found at Jebel Irhoud, Morocco yield the earliest fossil evidence for anatomically modern Homo sapiens

7 0

3 years ago

Read 2 more answers

Classify each of the four compounds as a conjugated, isolated, or cumulated diene. Compound A: Two alkenes are joined by a sigma

Lina20 [59]

Explanation:

Conjugated diene is the one that contains alternate double bonds in its structure. That means both the double bonds are separated by a single bond.

Cumulated diene is the one that contains two double bonds on a single atom. This means it has two double bonds continuously.

Isolated double-bonded compound has a single bond isolated by two to three single bonds.

Compound A: Two alkenes are joined by a sigma bond.

For example:

$-CH_2=CH-CH=CH2-$

It is a conjugated diene.

Compound B: Two alkenes are joined by a C H 2 group.

It is a cumulative diene.

Compound C: Two alkenes are joined by C H 2 C H 2.

Then it is an isolated alkene.

Compound D: A cyclohexene has a double bond between carbons 1 and 2. Carbon 3 is an sp 2 carbon that is bonded to another s p 2 carbon with an alkyl substituent.

Hence, compound D is a conjugated diene.

8 0

3 years ago