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4 years ago

8

HELP FAST 20 POINTS

2 answers:

schepotkina [342]4 years ago

8 0

D) Transportation is the correct answer

Naddik [55]4 years ago

7 0

The answer is D because it’s the movement of food substance from the stems to growing tissues and storage tissues,
The answer A is incorrect because it talks about the cycle

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If carbon-15 has a half-life of 2.5 seconds, % of the sample would still be

kramer

Answer:

After 5 second 25% C-15 will remain.

Explanation:

Given data:

Half life of C-15 = 2.5 sec

Original amount = 100%

Sample remain after 5 sec = ?

Solution:

Number of half lives = T elapsed / half life

Number of half lives = 5 sec / 2.5 sec

Number of half lives = 2

At time zero = 100%

At first half life = 100%/2 = 50%

At second half life = 50%/2 = 25%

Thus after 5 second 25% C-15 will remain.

8 0

4 years ago

Express the following numbers in scientific notation:

uranmaximum [27]

Answer :

(a) The number in scientific notation is, $6.0200\times 10^4L$

(b) The number in scientific notation is, $4.520\times 10^3J$

(c) The number in scientific notation is, $6.00\times 10^{-3}mg$

(d) The number in scientific notation is, $1.023\times 10^{-2}km$

(e) The number in scientific notation is, $8.070\times 10^1mL$

Explanation :

Scientific notation : It is the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.

For example :

5000 is written as $5.0\times 10^3$

889.9 is written as $8.899\times 10^{-2}$

In this examples, 5000 and 889.9 are written in the standard notation and $5.0\times 10^3$ and $8.899\times 10^{-2}$ are written in the scientific notation.

$8.89\times 10^{-2}$ this is written in the scientific notation and the standard notation of this number will be, 0.00889.

If the decimal is shifting to right side, the power of 10 is negative and if the decimal is shifting to left side, the power of 10 is positive.

(a) As we are given the 60200 L in standard notation.

Now converting this into scientific notation, we get:

$\Rightarrow 60200L=6.0200\times 10^4L$

As, the decimal point is shifting to left side, thus the power of 10 is positive.

Hence, the correct answer is, $6.0200\times 10^4L$

(b) As we are given the 4520 J in standard notation.

Now converting this into scientific notation, we get:

$\Rightarrow 4520J=4.520\times 10^3J$

As, the decimal point is shifting to left side, thus the power of 10 is positive.

Hence, the correct answer is, $4.520\times 10^3J$

(c) As we are given the 0.00600 mg in standard notation.

Now converting this into scientific notation, we get:

$\Rightarrow 0.00600mg=6.00\times 10^{-3}mg$

As, the decimal point is shifting to right side, thus the power of 10 is negative.

Hence, the correct answer is, $6.00\times 10^{-3}mg$

(d) As we are given the 0.01023 km in standard notation.

Now converting this into scientific notation, we get:

$\Rightarrow 0.01023km=1.023\times 10^{-2}km$

As, the decimal point is shifting to right side, thus the power of 10 is negative.

Hence, the correct answer is, $1.023\times 10^{-2}km$

(e) As we are given the 80.70 mL in standard notation.

Now converting this into scientific notation, we get:

$\Rightarrow 80.70mL=8.070\times 10^1mL$

As, the decimal point is shifting to left side, thus the power of 10 is positive.

Hence, the correct answer is, $8.070\times 10^1mL$

5 0

3 years ago

1 Which best defines concentration?A ratio that describes the amount of solute divided by the amount of solvent or solutionB rat

Alenkasestr [34]

1 Which best defines concentration?A ratio that describes the amount of solute divided by the amount of solvent or solutionB ratio that describes the amount of solvent or solution divided by the amount of solute C ratio that describes the mass of solute divided by the mass of solvent D ratio that describes the amount of solvent in a solution

ANSWER: (A) ratio that describes the amount of solute divided by the amount of solvent or solution

2 Which contributes to the dissolution of sugar in water?A the dissociation of an ionic compound in waterB a strong pull of water molecules on an ionic compoundC the dissociation of a polar covalent compound in waterD a strong pull of water molecules on a polar covalent compound

ANSWER: (D) a strong pull of water molecules on a polar covalent compound

4 0

3 years ago

Alicia cashed her paycheck and used half her earnings to take 3 friends to dinner. She spent $42.15 on dinner and she brought ho

MariettaO [177]

Alicia took half of her salary which is $42.15. So the total amount of her salary is $84..30.

Therefore, x-$42.15 ≥ $20.00

$84.30/x ≥$62.15

7 0

4 years ago

Read 2 more answers

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH

weeeeeb [17]

Answer:1)1.99 M

Explanation:

Molarity is given as = moles solute/Liter solution

The solute which is LiOH is already given in moles as 1.495 moles

Given that solution is 750 mL, we convert to liters.

Liters of the solution= mL of the solution x (1 L/1000 mL)

750 mL x (1 L/1000 mL)

0.75 L

Molarity = moles solute/Liter solution

Molarity = 1.495 moles of LiOH/0.75 L of solution

Molarity = 1.99M

The molarity of this solution is 1.99M (moles per liter).

5 0

3 years ago