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SIZIF [17.4K]
3 years ago
7

Unlike an animal's habitat, an animal's niche can be described by all of the following except A. the job the organism has within

its environment. B. the place in which the species lives. C. the way the species obtains what it needs to survive. D. the way the species obtains what it needs to reproduce.
Chemistry
2 answers:
Artemon [7]3 years ago
8 0
A niche is the role an organism fills within its environment. What and where an animal eats are considered part of its niche. For instance, some birds, such as woodpeckers, eat insects in trees. This limits the bug population and keeps bugs from overtaking the environment.
LenaWriter [7]3 years ago
6 0
The right answer is B. the place in which the species lives.

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Which solution has the lowest freezing point?
Leokris [45]
<span>Correct Answer: Option 3 i.e. 30 g of KI dissolved in 100 g of water.

Reason:
Depression in freezing point is a colligative property and it is directly proportional to molality of solution.

Molality of solution is mathematically expressed as,
Molality = </span>\frac{\text{Number of moles}}{\text{Weight of solvent (Kg)}}<span>

In case of option 1 and 2, molality of solution is 0.602 m. For option 3, molality of solution is 1.807 m, while in case of option 4, molality of solution is 1.205 m.

<u><em>Thus, second solution (option 2) has highest concentration (in terms of molality). Hence, it will have lowest freezing point</em></u></span>
3 0
4 years ago
Read 2 more answers
The temperature of 170 g of a material decreases by 20.0⁰C when it loses 3050 J of heat. What is its specific heat
qaws [65]

Answer:

0.897 J/g.⁰C

Explanation:

Given the following data:

m = 170 g (mass)

ΔT = 20.0⁰C (change in temperature)

q = 3050 J (amount of heat)

The amount of heat (q) is calculated as follows:

q = m x Cp x ΔT

Thus, we introduce the data in the mathematical expression to calculate the specific heat (Cp):

Cp = q/(m x ΔT) = 3050 J/(170 g x 20.0⁰C) = 0.897 J/g.⁰C

8 0
3 years ago
Given the two half-reactions, what must be done in the next step before the reaction can be balanced? Au3+ --&gt; Au I- --&gt; I
Artyom0805 [142]

Answer:

The balance equation is

2Au^{+3} + 6I^{-} → 2Au + 3I_{2}

Explanation:

first, we have to make sure that the atoms are balanced

Au^{+3} → Au^{}

2I^{-} → I_{2}

then we proceed to balance charges of each half-reaction

Au^{+3} + 3e^{-} → Au^{}

2I^{-} → I_{2} + 2e^{-}

Now we multiply the half-reactions to match the number of electrons in each one

(Au^{+3} + 3e^{-} → Au^{})x2

            (2I^{-} → I_{2} + 2e^{-})x3

and now we do the sum of the half-reactions

2Au^{+3} + 6e^{-} → 2Au^{}

              6I^{-} → 3I_{2} + 6e^{-}

2Au^{+3} + 6I^{-} → 2Au + 3I_{2}

note: the only atom that needed to be balanced was I

3 0
4 years ago
Read 2 more answers
How to distinguish physical changes from chemical changes.
Agata [3.3K]

Chemical changes is all that which occurs with the formation of new substances.

 Physical changes are all the transformations of matter without altering its chemical composition occurs. Is any phenomenon that occurs without the formation of new substances.

hope this helps!
8 0
3 years ago
How many grams of dry NH4Cl need to be added to 2.10L of a 0.700M solution of ammonia, NH3, to prepare a buffer solution that ha
dezoksy [38]
I got 9.25527 for the pKa 
<span>then for the Henderson-Hasselbalch equation: </span>
<span>9.00=9.25527+log(.600/acid) </span>
10^(-.25527)=(.600/acid)correct to this line. Then 
0.5556 = 0.6/acid and 
acid = 0.6/0.5556 = 1.08 which is the reciprocal of your number) 

<span>.5556/.600M=acid </span>
<span>acid=.925925...M </span>
<span>(.925925)*2.10L= Molarity</span>
4 0
3 years ago
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