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3 years ago

Please help me, will mark brain whoever answers the fastest!

Chemistry

2 answers:

inna [77]3 years ago

7 0

Grass, Grass Hopper, Frog, Snake, then Hawk.

For the food web question, it would be the third option because most organisms eat more than one thing.

The original source of energy in most ecosystems is the sun.

The owl would receive the least amount of energy because each level of the food chain only gains 10% of the organisms energy.

iogann1982 [59]3 years ago

3 0

Page 1

1: The grass

2: The grasshopper

3: The frog

4: The snake

5: The eagle

Page: 2

The answer is the 2nd one

Page: 3

The owl would because its at the end it would have almost no more sun energy left in whatever it eats.

Hope This Helps :)

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1,670,000,000 in<br> scientific notation pleaseeee

noname [10]

Answer:

1.67 × 10^9

Explanation:

6 0

3 years ago

Read 2 more answers

at a given tempature gas with a pressure of 150 kpa has volume of 0.8 l if the pressure decreases to 75kpa and the temperature r

vova2212 [387]

<span>P*V/T=constant
so P*V= constant*T
if T doesn't change then
P*V= constant
so 150kPa*0.8L=75kPa*xL
xL=150kPa*0.8L/75kPa=1.6L
hope it help</span>

8 0

3 years ago

A sample of hydrogen gas was collected over water. If the total pressure

Brut [27]

It would 47.7 because you would have to both minus the number together.

7 0

2 years ago

A person's heartbeat is 73 beats per minute. If his heart beats 3.1e9 times in a lifetime, how long does the person live?

tiny-mole [99]

Answer: The person lived for 80.66 years.

Explanation:

Heart beat of the person = 73 beat /min

Number of total heart beats = $3.1\times 10^{9}$

Life span of the person : $\frac{\text{Total heart beats of the person}}{\text{Heart beat per minute}}=\frac{3.1\times 10^{9} beats}{73 beat/min}$

1 year =525600 mins

Life span = $0.0424\times 10^{9} min=80.66 years$

The person lived for 80.66 years.

7 0

2 years ago

Why cant (NaCl) light the bulb until the NaCl is dissolved in water. *

Aneli [31]

Answer:

NaCl will only conduct electricity in solutions

Explanation:

For electrical conduction, free mobile electrons as seen in most metals must be present or ions which are charged particles must be available for solutions and molten substances.

Sodium chloride is an ionic compound without free mobile electrons or ions despite being ionic.
It will maintain a subtle and unique charge stability when in solid form.
In solid, the ions are not free to move and remain locked up in the solid mass.
When introduced into a solution, the ions becomes free to move and this will aid electrical conduction.

6 0

3 years ago