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Svetlanka [38]
3 years ago
10

Behind your house, there's a gorgeous pond filled with frogs. You notice that the frogs behind Mr. Archer's house often have thr

ee legs. You start wondering if the fertilizer that Mr. Archer uses for his lawn is causing the deformities in the frogs. You collect 10 frogs and put the special fertilizer in their container (Group A). You put another 10 frogs and place them in a different container with just water (Group B). A week later, 7 out of 10 of the frogs in group A grew only three legs. The frogs in group B grew four legs.
What was the control group?
Chemistry
1 answer:
borishaifa [10]3 years ago
4 0

Answer:

Group B is the control group

Explanation:

In an experiment, a control group is the standard to which comparisons are made in an experiment.

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Explanation:

3 0
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Read 2 more answers
Given: N2H4(l) + O2(g) LaTeX: \longrightarrow⟶ N2(g) + 2H2O(g) ΔH°1 = –543 kJ·mol–1 2H2(g) + O2(g) LaTeX: \longrightarrow⟶ 2H2O(
kakasveta [241]

Answer:

Explanation:

Given reaction

N₂H₄ + O₂ ⇒ N₂ + 2H₂O   ΔH₁ = -543 KJ ---------- ( 1 )

2H₂ + O₂ ⇒ 2H₂O              ΔH₂ = -484 KJ ---------- ( 2 )

N₂ + 3 H₂ ⇒ 2NH₃              ΔH₃ = -92 KJ  -----------( 3 )

( 1 ) -  ( 2 ) +( 3 )

N₂H₄ + O₂ - 2H₂ - O₂ +N₂ + 3 H₂ ⇒ N₂ + 2H₂O - 2H₂O +2NH₃  

                                                         ΔH =       -543 + 484 -92 = -151 KJ

     N₂H₄ + H₂ ⇒ 2NH₃     ΔH  = -151 KJ .

2NH₃ ⇒ N₂H₄ + H₂     ΔH  = + 151 KJ

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