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2 years ago

10

1 (

2 answers:

Annette [7]2 years ago

4 0

Answer:

b) Pine Tree

Pine trees need wind for fertilization to occur.

VashaNatasha [74]2 years ago

3 0

Answer:

Gymnosperm, So in reality its Pine Tree. ;):)

Explanation:

Gymnosperm Fertilization The female gametophyte contains several archegonia, where the egg cells originate and develop. Fertilization occurs when pollen grains (male gametophytes) are carried by the wind to the open end of an ovule, which contains the eggs, or female gametophyte.

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Perform the following operation

jolli1 [7]

Answer:

coefficient green : 2.4865

exponent (yellow) : 16

Explanation:

3 0

3 years ago

The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent.

kotegsom [21]

Answer:

The percentage is k $= 20.8$ %

Explanation:

From the question we are told that

The mass of the stibnite is $m_s = 5.86 \ g$

The volume of KBrO3(aq) is $V = 26.6 mL = 26.6 *10^{-3} \ L$

The concentration of KBrO3(aq) is $C = 0.125 M$

Now the balanced ionic equation for this reaction is

$BrO_3 ^{-}+ 3Sb^{3+} + 6H^{+} \to Br^{1-} + 3Sb^{5+} + 3H_2O$

The number of moles of $BrO_3 ^{-}$ is

$n = C *V$

substituting values

$n = 26.6*10^{-3} * 0.125$

$n = 0.003325 \ mols$

from the reaction we see that 1 mole of $BrO_3 ^{-}$ reacts with 3 moles of $Sb^{3+}$

so 0.003325 moles will react with x moles of $Sb^{3+}$

Therefore

$x = \frac{0.003325 * 3}{1}$

$x = 0.009975 \ mols$

Now the molar mass of $Sb^{3+}$ is a constant with a values of $Z = 121.76 \ g/mol$

Generally the mass of $Sb^{3+}$ is mathematically represented as

$m = x * Z$

substituting values

$m = 1.215 \ g$

The percentage of Sb(antimony) in the overall mass of the stibnite is mathematically evaluated as

k $= \frac{1.215}{5.85 } * 100$

k $= 20.8$ %

4 0

3 years ago

Read 2 more answers

Crude oil is derived from which of the following materials

Aleks04 [339]

Answer:

Fossil Fuel

Explanation:

Im not sure if this is the correct answer for your assignment but it is the answer i know

5 0

3 years ago

Read 2 more answers

A mixture is ( is/is not ) a chemical combining of substance?

Nuetrik [128]

Not a chemical combination. A mixture can be easily separated

3 0

4 years ago

Read 2 more answers

15 points + brainliest pls help :(

Komok [63]

Answer:

27 g

Explanation:

M(C6H12O6) = 6*12 + 12*1 + 6*16 = 180 g/mol

100 mL = 0.1 L solution

1.5 M = 1.5 mol/L

1.5 mol/L * 0.1 L = 0.15 mol C6H12O6

0.15 mol * 180 g/1 mol = 27 g C6H12O6

6 0

3 years ago