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Alexxx [7]
3 years ago
7

What rock has a hardness of 4,and has a dull luster. What is it?

Chemistry
1 answer:
gogolik [260]3 years ago
5 0

Answer:

Fluorite

Explanation:

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Explain the difference between commensalism,parasitism,and mutualism and give examples of each
vaieri [72.5K]
Commercialism is when one benefits while the other gets no harm nor benefit.
Example: the Remora rides attached to bigger types of fish or shark and eat the remains of meals left behind from the organism they are attached to. 

Parasitism is when benefits and the other is harmed. 
Example: A tape worm feeds off the intestines and eat what the host eats, killing the host because they are deprived of nutrients. 

Mutualism is when both benefit.
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6 0
3 years ago
The reaction of cr2+(aq) with cr2o2−7(aq) in acid solution to form cr3+(aq). calculate δg∘rxn.
Nat2105 [25]
The reaction is:
6 Cr²⁺ + Cr₂O₇²⁻ + 14 H⁺ → 8 Cr³⁺ + 7 H₂O

E₀ = 1.33 - (-0.5) = 1.83 V

ΔG = - n f E₀
      = - 6 * 96485  * 1.83
      = - 1059405.3 J / mol
      = - 1059.4 kJ / mol
8 0
3 years ago
Read 2 more answers
What is the molarity of a solution made by mixing 2.80 g of koh with enough water make 750 ml of solution?
Travka [436]
<span>Molarity is expressed as the number of moles of solute per volume of the solution. We calculate as follows:

2.80 g ( 1 mol / 56.11 g ) = 0.05 mol KOH

Molarity = 0.05 mol KOH / 750 mL ( 1 L / 1000 mL )
Molarity = 0.07 M

Hope this answers the question. Have a nice day.</span>
7 0
3 years ago
1. The Lewis structure for CO2 has a central ________ atom attached to __________ atoms.
maksim [4K]
Central "carbon" atom

2 oxygen atoms

held together by "covalent" bonds

has a "1s2 2s2 2px1 2py1 2pz0" electron
geometry

carbon atom is "sp" hybridized

8 0
3 years ago
3. 2.15 x 3.1 x 100 =
jeka94

Answer:

666.5

Explanation:

Multiply 2.15 and 3.1 to get 6.665.

6.665×100≈666.5

Multiply 6.665 and 100 to get 666.5.

666.5

3 0
3 years ago
Read 2 more answers
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