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cupoosta [38]
3 years ago
11

Urgent!!

Chemistry
2 answers:
madam [21]3 years ago
6 0

Answer:

Harmony is correct, because Mendeleev’s model made predictions that came true.

Explanation:

Mendeleev published periodic table.

Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful.

Our answer is : Harmony is correct, because Mendeleev’s model made predictions that came true.

7nadin3 [17]3 years ago
4 0

Answer:

Harmony is correct, because Mendeleev’s model made predictions that came true.

Explanation:

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Use the periodic table to calculate the molar mass of each compound below. Give your answer to the correct number of significant
agasfer [191]
From the periodic table you get the atomic masses of each element.

These are the values that I have in my periodic table (use those numbers of your periodic table if your teache gave you a specific one)

Na: 23 g/mol
O: 16 g/mol
H: 1 g/mol
C: 12 g/mol
Ca: 40 g/mol
S: 32 g/mol
Mg: 24 g/mol
P: 31 g/mol

Now I will do some examples and you do the others:

1) NaOH: 1 atom of Na * 23 g/mol + 1 atom of O * 16 g/mol + 1 atom of H * 1 g/mol

=> 1*23g/mol + 1*16g/mol + 1*1g/mol = 40 g/mol

2) H2O

=> 2 atoms of H * 1 g/mol + 1 atom of O * 16 g/mol = 2*1g/mol + 1*16g/mol = 18 g/mol

3) Glucose: C6H12O6

6*12 g/mol + 12 * 1g/mol + 6*16 g/mol = 72g/mol + 12g/mol + 96 g/mol = 180 g/mol

4) CaSO4:

1*40 g/mol + 1*32g/mol + 4*16g/mol = 136 g/mol

Now you only have to do the last one by your own.


7 0
4 years ago
Read 2 more answers
Write the structure of a D-aldohexose that gives a meso compound on treatment with NaBH4 in water.
soldier1979 [14.2K]

Explanation:

Meso compounds are optically inactive stereoisomers. Despite of having chiral carbon, they do not show  optical activity because it has a plane of symmetry in its structure itself. It is superposable on its mirror image.

Aldo sugars on reaction which reducing agents such as , NaBH₄ reduces the carbonyl group in the sugar to alcohol and gives corresponding alditol.

<u>The D- aldohexose which on reduction gives a meso alditol are allose and galactose. </u>

<u>The structure is shown in the image below. Thus, in allitol and galactitol formed have internal plane of symmetry which makes the optically inactive.</u>

7 0
3 years ago
What is the purpose of strawberry seeds
Neporo4naja [7]

Answer:

The goal there is for the fruit to not get eaten, so that the seed can rely on the fruit's nutrients to support its growth.” Presumably, the strawberry went for evolutionary option number one – attract something to spread the seeds  

Explanation:

7 0
4 years ago
If you needed to make 100 mL of a 0.2 M fruit drink solution from the 1.0 M fruit drink solution, how would you do it? (Hint: Us
Studentka2010 [4]

Answer: We take 20 ml of 1.0 M fruit drink and add 80 ml of water to get 100 ml of 0.2 M solution.

Explanation:

According to the neutralization law,

M_1V_1=M_2V_2

where,

M_1 = molarity of stock solution = 0.2 M

V_1 = volume of stock solution = 100 ml

M_2 = molarity of resulting solution = 1.0 M

V_2 = volume of resulting solution = ?

Now put all the given values in the above law, we get the volume of resulting solution.

(0.2M)\times 100=(1.0M)\times (V_2)

V_2=20ml

Therefore, the volume of 1.0 M required is 20 ml.

We take 20 ml of 1.0 M fruit drink and add 80 ml of water to get 100 ml of 0.2 M solution.

7 0
3 years ago
In the reaction Mg (s) + 2HCl (aq) -&gt; H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 300 millilite
d1i1m1o1n [39]
Mg(s) + 2HCl(aq) = H₂(g) + MgCl₂(aq)

v=300 ml=0.3 l
c=4 mol/l

n(HCl)=vc

m(H₂)/M(H₂)=n(HCl)/2

m(H₂)=M(H₂)vc/2

m(H₂)=2.0g/mol·0.3 l · 4mol/l /2 = 1.2 g

1.2 grams of hydrogen gas will be produced
5 0
4 years ago
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