All categories

3 years ago

Nearly all the energy from the earth receives from the sun is used in photosynthesis

Chemistry

1 answer:

dezoksy [38]3 years ago

4 0

Answer: It is false because we use alot of it to with solar power.

You might be interested in

Caculate the mass of a solid with a density of 14.2 g/cm cubed and a volume of 350 cm cubed

shepuryov [24]

Answer:

The mass of solid with density 14.2 g/cm3 and volume 350 cm3 is 4.97 Kg.

Explanation:

Formula for density is given below :

$density = \frac{mass}{volume}$

$volume = 350 cm^{3}$

$density = 14.2 g/cm^{3}$

Insert the values in the formula

$14.2 = \frac{mass}{350}$

on cross multiplication :

$mass = density\times volume$

$mass = 14.2\times 350$

$mass = 4970 g$

1 g = 0.001 Kg

$mass =4970\times 0.001 Kg$

mass = 4.97 Kg

Note : Check the units of volume and density carefully

8 0

3 years ago

If you see trapped bubbles ,you have to tap the cover slip using a

trapecia [35]

Answer:

?.............?...............

5 0

3 years ago

An atom has 13 protons and 14 neutrons. What is its mass number?

Hitman42 [59]

Protons have a mass of 1
Neutrons have a mass of 1

So 13*1 + 14*1 = Mass number 27

3 0

3 years ago

Read 2 more answers

Suppose that a certain atom possesses only four distinct energy levels. Assuming that all transitions between levels are possibl

olya-2409 [2.1K]

Answer:

Following are the response to the given question:

Explanation:

The number of shells

n = 4

Calculating the spectral line:

$= \frac{n(n-1)}{2}\\\\ = \frac{4(4-1)}{2} \\\\= \frac{4\times 3}{2}\\\\ = \frac{12}{2}\\\\ = 6$

4 0

3 years ago

A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration o

HACTEHA [7]

Answer:

1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Explanation:

From the question given above, the following were obtained:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Volume of solution = 20.4 mL

Concentration of solution =?

Next, we shall determine the mass of sodium hydroxide, NaOH. This can be obtained as as illustrated below:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Mass of NaOH =?

Mass of NaOH = (Mass Cylinder + NaOH) – (Mass of empty cylinder)

Mass of NaOH = 31.92 – 9.5

Mass of NaOH = 22.42 g

Finally, we shall determine concentration of the solution as follow:

Mass of NaOH = 22.42 g

Volume of solution = 20.4 mL

Concentration of solution =?

Concentration = mass /volume

Concentration of solution = 22.42 / 20.4

Concentration of solution = 1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Therefore, the concentration of the solution is 1.1 gmL¯¹

3 0

4 years ago