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aniked [119]
4 years ago
14

Choose all the answers that apply. Which of the following will decrease reaction rate? increase in pressure. decrease temperatur

e. increase concentration. decrease concentration
Chemistry
2 answers:
zloy xaker [14]4 years ago
4 0
Decrease temperature and decrease of concentration will decrease reaction rate, because less molecules will be able to react.
Oksana_A [137]4 years ago
4 0

Answer:

Decrease temperature and decrease of concentration will decrease reaction rate, because less molecules will be able to react.

Explanation:

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The valency of metal 'm' 1+. give the formula of its oxide​
Vinvika [58]

Answer:

M_{2}O

Explanation:

Anything oxide is a compound with oxygen, and since oxygen is -2, it requires two of the metal's +1 to make it zero

In other words:

2(+1) + (-1) = 0

7 0
3 years ago
Most of the mass of an atom is contained:
vovikov84 [41]
Most of the mass of an atom is in the Nucleus.
8 0
3 years ago
Compounds X, C9H19Br, and Y, C9H19Cl, undergo base-promoted E2 elimination to give the same single alkene product, Z. Catalytic
Pavlova-9 [17]

Answer:

Compound X= 4-bromo-2,3,3-trimethylhexane

Compound Y= 5-chloro-2,3,3-trimethylhexane

Explanation:

The first step is set up the problem. That way we can obtain some clues. If we check figure 1 we can obtain some ideas:

-) If we have E2 reaction is not possible a <u>methyl or hydride shift</u>.

-) If we have an E2 reaction we will need an H in <u>anti position</u> to obtain the double bond. Therefore a double bond with the quaternary carbon (the carbon bonded to the 2 methyl groups).

The second step is to solve the alkene structure. We have to put the <u>leaving group</u> near to carbon that has more possible <u>removable hydrogens</u>.  That's why the double bond is put it between carbons 5 and 4 of the alkane (Figure 2).

The third step is the structure of the <u>alkyl bromide</u> structure. To do this we have to check the alcohol produced by the alkene. In the <u>hydration of alkanes</u> reaction we will have a <u>carbocation</u> formation. Therefore we can have for the alkene proposed a methyl shift to obtain the most stable carbocation. With this in mind, we have to do the same for the Alkyl bromide that's why the Br is put it carbon 4 of the alkane. If we put the Br on this carbon we can have the chance of this <u>methyl shift</u> also, to obtain the same alcohol (figure 3).

Finally, for the <u>alkyl chloride</u>, we only have 2 choices because to produce the alkane we have to put the <u>leaving group</u> on one of the 2 carbons of the double bond. If we choose the same carbon on which we put the Br we can have the same behavior of the alkyl bromide (the <u>methyl shift</u>), therefore we have to put in the other carbon.

7 0
3 years ago
Isotope Atomic Mass (amu) Percent Abundance
exis [7]

Answer:

The average atomic mass is closer to Si- 28 because this isotope is present in more percentage in the sample.

Explanation:

Given data:

Atomic mass of silicon= ?

Percent abundance of Si-28 = 92.21%

Atomic mass of Si-28 = 27.98 amu

Percent abundance of Si-29 = 4.70%

Atomic mass of  Si-29 = 28.98 amu

Percent abundance of Si-30 = 3.09%

Atomic mass of  Si-30 = 29.97 amu

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)+(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass = (92.21×27.98)+(4.70×28.98)+(3.09×29.97) /100

Average atomic mass =  2580.04 +136.21+92.61 / 100

Average atomic mass = 2808.86 / 100

Average atomic mass  = 28.08amu.

The average atomic mass is closer to Si- 28 because this isotope is present in more percentage in the sample.

7 0
3 years ago
Read 2 more answers
Select all that are true
kipiarov [429]
I think it’s B not quite sure ! Sorry
8 0
3 years ago
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