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hammer [34]
3 years ago
10

The photograph shows one of the boats in a science club's toy boat race. All the boats were powered by identical

Chemistry
2 answers:
romanna [79]3 years ago
6 0

Answer:

boat p

Explanation:

____ [38]3 years ago
4 0

Answer:

Boat p

Explanation:

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What trends were seen in medeleevs periodic table
Paraphin [41]

Answer:

groups are based on how many electrons to become stable

Explanation:

8 0
3 years ago
Click on the box to choose which compound has a greater difference in electronegativities of its members. Use the
4vir4ik [10]

Answer:

See the example below.

Explanation:

Let us make an example with a group of compounds to apply the general <em>trends of electronegativities</em> within families to find which compound has a greater difference in electronegativities.

Use this group.

  • a. HBr
  • b. HI
  • c. HF
  • d. HCl
  • e. H₂

Br, I, F, and Cl belong to the halogen family (group or column 17 of the periodic table).

Electronegativity is a relative measure of how strong an atom atracts the bonding electrons in a compound.

Since the strength of attracion of the valence electrons by the nucleus of an atom decreases as the size of the atom incease, in a family of elements (same group) the electronegativity decreases as you go down in the group.

The order of the halogens from top to bottom in the column in the periodic table is F, Cl, Br, and I.

Thus, the order of their electronegativiies is: F > Cl > Br > I. F is the most electronegative atom, and all those elements have higher electronegativy than H. (The electronegativiy of I is 2.66 and the electronegativity of H is 2.2). Thus, including H, the rank of the electronegativities is F > Cl > Br > I > H.

Thus, the greater difference in electronegativities is for HF (option a.).

Note, that the difference in electronegativites of the atoms of the molecule H₂ is zero, since both atoms have the same electronegativity.

3 0
3 years ago
Read 2 more answers
Which answer best describes the continental shelf?
Ilya [14]
It’s not the surf area along coastlines
5 0
3 years ago
Read 2 more answers
A 100g piece of iron at 150oC is emersed in 268.5 g of water at 20oC. the temperature of both iron and water became 25oC. If the
borishaifa [10]

Answer:

cW = 4.2J/g.k

Explanation:

Heat gained = Heat lost

iron(mc∆€) = water(mc∆€)

mi= 100g

ci = 0.449

∆€i= 150-25 = 125

...

mw= 268.5g

cw = ?

∆€w=25-20 = 5

...

100×0.449×125= 268.5×cw×5

5612.5= 1342.5cw

cw = 5612.5/1342.5

cw= 4.18 ~ 4.2J/g.K

4 0
2 years ago
Sodium and water react according to the equation
elena55 [62]

2Na(s) + 2 H2O (liquid) -> 2 NaOH (aq) + H2 (g)


1) 2 reactants are given, so we have to find which of them is an excess reactant and which of them will react completely.

Convert gram of Na and H2O into moles.

M(Na) =23.0 g/mol

10.0 g Na*1 mol Na/23.0 g Na≈0.4349 mol Na


M(H2O) = 2*1.0 +16.0 = 18.0 g/mol

50.0 g H2O*1 mol H2O/18.0 g H2O =2.778 mol H2O


2Na(s) + 2 H2O (liquid) -> 2 NaOH (aq) + H2 (g)

from equation 2 mol 2 mol

given 0.4349 mol 2.778 mol


We can see that H2O is an excess reactant, so we are going to find amount of H2 using Na.


2)

2Na(s) + 2 H2O (liquid) -> 2 NaOH (aq) + H2 (g)

from equation 2 mol 1 mol

given 0.4349 mol x mol


x=(0.4349*1)/2 =0.21745 mol H2


3) mass of H2

0.21745 mol H2 * 2.0 g H2/1 mol ≈ 0.435 g H2


Answer : 0.435 g H2.


7 0
3 years ago
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