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3 years ago

Can you help me with this one pls

Chemistry

1 answer:

sweet-ann [11.9K]3 years ago

6 0

Answer:

a. IV - Different Colored Light Bulbs used on tomato plants

b. DV - Growth, and effects that occur to plant

c. Control = The 5th plant that goes under a typical white light bulb.

d. 3 Constants Include:

-Amount of time plants are under each light (12 hr period)

-Same amount of water given to each plant

-Same type and amount of soil given to each plant.

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Many trials are not needed before a hypothesis can be accepted

aalyn [17]

Your hypothesis is at the biggenning or the end of you summary

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4 years ago

45. most abundant metal in the earth's crust<br> 46. first discovered in light coming from the sun

Yanka [14]

Answer:

45. Aluminum

46. helium

Explanation:

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3 years ago

NEED HELP ASAP; PLEASE SHOW YOUR WORK.

Sindrei [870]

Answer:

n = 0.3 mol

Explanation:

Given data:

Volume of gas = 8.0 L

Temperature of gas = 45 °C (45+273 = 318 K)

Pressure of gas = 0.966 atm

Moles of gas present = ?

Ideal gas constant = R = 0.021 atm.L/mol.K

Solution:

Formula:

PV = nRT

P = Pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

Now we will put the values:

0.966 atm × 8 L = n × 0.0821 atm.L/mol.K × 318 K

7.728 atm.L = n × 26.12 atm.L/mol

7.728 atm.L / 26.12 atm.L/mol = n

n = 0.3 mol

5 0

4 years ago

You have 16.0 g of some compound and you perform an experiment to remove all of the oxygen, 11.2 g of iron is left. What is the

oksian1 [2.3K]

The empirical formula of this compound is equal to $Fe_{2}O_3$ .

<h3>Empirical formula</h3>

To calculate the empirical formula of a compound, it is necessary to know the number of moles present.

Therefore, we will use the molar mass of iron and oxygen to find the amount of moles, so that:

$MM_O = 16g/mol\\MM_Fe = 55.8g/mol$

$MM = \frac{m}{mol}$

Oxygen

$16 = \frac{4.8}{mol}$

$mol = 0.3$

Iron

$55.8 = \frac{11.2}{mol}$

$mol = 0.2$

Finally, as the empirical formula is composed of integers numbers of moles, just multiply the values by the smallest common factor to transform into an integer, so that:

O => $0.3 \times 10 = 3moles$

Fe => $0.2 \times 10 = 2moles$

So, the empirical formula of this compound is equal to $Fe_{2}O_3$

Learn more about empirical formula in: brainly.com/question/1363167

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3 years ago

Observe the concentrations of the hydronium ions(H3O+), hydroxide ions(OH-), and water (H2O) in the “Water Components” chart on

tia_tia [17]

FOLLOWING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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3 years ago