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3 years ago

14

Many organisms in an ecosystem copete with each other for resources. What might different species of trees in a forest ecosystem

compete for?

2 answers:

sineoko [7]3 years ago

4 0

Territory and energy sources

Sliva [168]3 years ago

3 0

the answer is C. Water

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Which describes what a velocity/time graph would look like with no acceleration?

Gwar [14]

Answer:

Explanation:With no acceleration the graph would be flat.

5 0

3 years ago

Read 2 more answers

Please help me on Q2 <br> I’ll be so incredibly grateful!!

eimsori [14]

Answer:

No. of neutrons = 27 - 13 = 14

No. of protons = No. of electrons = 13

Hope it helps you

4 0

3 years ago

Consider a galvanic cell based on the reaction Al^3+_(aq) + Mg_(s) rightarrow Al_(s) + Mg^2+ _(aq) The half-reactions are Al^3+

grin007 [14]

<u>Answer:</u> The standard cell potential of the cell is -0.71 V

<u>Explanation:</u>

The half reactions follows:

<u>Oxidation half reaction:</u> $Mg\rightarrow Mg^{2+}+2e^-;E^o_{Mg^{2+}/Mg}=-2.37V$ ( × 3)

<u>Reduction half reaction:</u> $Al^{3+}(aq.)+3e^-\rightarrow Al(s);E^o_{Al^{3+}/Al}=-1.66V$ ( × 2)

The balanced cell reaction follows:

$2Al^{3+}(aq.)+3Mg(s)\rightarrow 2Al(s)+3Mg^{2+}(aq.)$

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

Putting values in above equation, we get:

$E^o_{cell}=-2.37-(-1.66)=-0.71V$

Hence, the standard cell potential of the cell is -0.71 V

8 0

3 years ago

If two electrically charged objects repel one another, which statement must be true? One object has more electrons, and the othe

mel-nik [20]

Answer:

The two objects have the same electric charge.

Explanation:

Electrically charged objects repel if they are both of the same charge, ie plus plus or minus minus.

4 0

3 years ago

For the reaction of 2Na2O, if you have 18.0 g of Na, how many grams of O2 are needed for reaction?

geniusboy [140]

Answer: -

6.26 grams

Explanation: -

Atomic Mass of sodium Na = 23 gram

Mass of Na = 18 g

Atomic mass of oxygen O = 16 gram

Molar mass of O2 = 16 x 2 = 32 gram

The balanced chemical equation for the reaction is

4 Na + O2 -- > 2 Na 2 O

From the balanced chemical equation, we see

4 Na requires 1 O2

4 x 23 gram of Na requires 32 gram of O2

18 g of Na gives $\frac{32 g O 2 x 18 g Na}{4 x 23 gram Na}$

= 6.26 grams of O2

For the reaction of formation of Na2O, for 18.0 g of Na, 6.26 grams of O2 are needed for reaction.

8 0

3 years ago