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4 years ago

PLEASE HELP!! IM IN NEED!!

Chemistry

2 answers:

Svet_ta [14]4 years ago

7 0

Answer:

D) A giraffe's long tail

Explanation:

I'm guessing this is the right choice because:

a. Migration is a survival instinct and doesn't particularly help with energy.

b. A polar bear's thick fur is to protect it from the cold and helps to warm the animal, but it doesn't supply energy.

c. A monkey's long tail is indeed useful for hanging from branch and climbing, yet they have four other limbs that aid in the same process and again, it doesn't neccessarily supply energy.

d. A giraffe's long neck is used to eat from trees since giraffes are herbivores and eat from tall trees, which counts as energy. This is because when the eaten it is later converted into protein to be used energy.

I hope this helps!

VARVARA [1.3K]4 years ago

4 0

Answer:

a monkey long tail

Explanation:

i took the test; Edited

well idk anymore bc i tried the giraffe and it was wrong then the monkey and it said girafe was correct. Giraffe is correct guys.

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a blank in the speed of the molecules allows the attractions between atoms and a little closer together

anygoal [31]

Idk it’s there’s a picture(it won’t load or no picture) but when molecules move slow and are kidna packed together it is a solid

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4 years ago

8. What was the original concentration in the BHL sample, if the dilution is 1:500 and the concentration 0.07 mg/ml

Yakvenalex [24]

Answer:

The original concentration is "35 mg/ml".

Explanation:

According to the question,

The solution is diluted,

= 1:50

The initial volume,

V1 = 1 ml

Final concentration,

= 0.07 mg

then,

The final volume,

V2 = 500 ml

As we know,

⇒ $V_1N_1=V_2N_2$

or,

⇒ $N_1=\frac{V_2N_2}{V_1}$

On substituting the values, we get

⇒ $=\frac{500\times 0.07}{1}$

⇒ $=\frac{35}{1}$

⇒ $=35 \ mg/ml$

4 0

3 years ago

Find the number of atoms in 237g Cu (molar mass of Cu63.55g/mol)

MakcuM [25]

In order to find the amount of atoms you have to find the moles then multiply by Avogadro's Constant (L)

mol = $\frac{MASS}{Molar Mass}$

= $\frac{237 g}{63.55 g/mol} 
$

= 3.73 mol

Number of atoms of Cu = mol × L

= 3.73 mol × (6.02 × 10²³)

= 2.245 × 10²⁴ atoms of copper

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3 years ago

Given: 2H2O2 → 2H2O + O2 structure of H2O2: H–O–O–H Bond Bond Energy (kJ/mol) O–H 459 O=O 494 O–O 142 Based on the given bond en

ICE Princess25 [194]

Answer:

B. - 210 kJ

Explanation:

∵ ΔHrxn = ∑(bond energies)products - ∑(bond energies)reactants.

The bond formation in the products releases energy (exothermic).

The bond breaking in the reactants requires energy (endothermic).

The products:

H₂O contains 2 O-H (- 459 kJ/mol) bonds.

O₂ contain 1 O=O (- 494 kJ/mol) bond.

The reactants:

H₂O₂ contain 2 O–H (459 kJ/mol) bonds and 1 O–O (142 kJ/mol) bond.

∵ ΔHrxn = ∑(bond energies)products - ∑(bond energies)reactants.

∴ ΔHrxn = [2 (2 x (O–H bond energy) + (1 x (O=O bond energy)] - 2 [(2 x (O–H bond energy) + (1 x (O–O bond energy)] = [2 (2 x - 459 kJ/mol) + (1 x - 494 kJ/mol)] - 2 [(2 x 459 kJ/mol) + (1 x 142 kJ/mol)] = (- 2330 kJ) + (2120 kJ) = - 210 kJ.

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3 years ago

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AleksandrR [38]

B

explanation:
it’s common sense

4 0

3 years ago