Lana is testing her hypothesis that marigolds grow faster in red light than in yellow light. If the plants in yellow light grow faster during her experiment what should Lana do next? A. Assume that she made a mistake during the experiment B. Report that her hypothesis was useless C. Conclude that the experiment did not work D. Repeat the experiment to confirm the result​

Answer:

B, Gas B.

Explanation:

The empirical formula for a compound : ZnO

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

Determine the mass ratio of the constituent elements of the compound.  

Determine the mole ratio by by dividing the percentage by the atomic mass

Percentage Oxygen :

100\%-80.2%=19.8\%

mol ratio for Zn : O =

[tex]\tt \dfrac{80.2}{65.38}\div \dfrac{19.8}{16}\\\\1.227\div 1.238\rightarrow divide~by~smallest(1.227)\\\\1\div 1[/tex]

Answer:

The uncertainty of inventiveness and futuristic ideas usually deal with science and technology. ... This is usually linked to futuristic ideas, which may not fit in today's society, but which impose improvements, or not, for societies in the future.

Answer:

The solubility of calcium phosphate is

2.21x10−4g/L.

Explanation:

Answer:

24.5g

Explanation:

Given parameters:

Mass of oxygen gas = 21.8g

Unknown:

Mass of water  = ?

Solution:

This problem deals with the decomposition of water;

    Reaction equation;

                  2H₂O →  2H₂  +  O₂

2 mole of water will produce 1 mole of oxygen gas

First find the number of mole of the oxygen gas given;

          Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

    molar mass of O₂   = 2(16) = 32g/mol

  Number of moles of O₂  = [tex]\frac{21.8}{32}[/tex]   = 0.68moles

    1 mole of oxygen gas will be produced from 2 mole of water

     0.68moles of oxygen gas will be produce from  0.68 x 2 moles of water;   = 1.36moles of water

Mass of water = number of moles x molar mass

  Molar mass of water = 2(1) + 16  = 18g/mol

Mass of water  = 1.36 x 18  = 24.5g

Explanation:

The Brønsted–Lowry theory is an acid–base reaction theory which was proposed independently by Johannes Nicolaus Brønsted and Thomas Martin Lowry in 1923

Given that :

Reaction equation ; [tex]HB_{r} + KOH ---> KBr + H_{2}O[/tex]

A) and B)  Determine the Initial pH before addition of titrant

First step : compute the value of pOH

pOH = - log ( [OH⁻])

        = -log ( 0.320 ) = 0.50

∴ Initial pH before the titrant is added = 14 - pOH

                                                               = 14 - 0.5 = 13.5

C ) Determine the pH of solution after 5 mL titrant is added

First step : determine the reacting moles of each substance

n kOH = 0.025 mL * 0.320 mol/L = 0.00800 mol

n HBr = 0.005 * 0.750 mol/L = 0.00375 mol

next step : compute the value of the concentration of OH⁻ in final solution

n kOH ( remaining ) = 0.00800 - 0.00375 = 0.00425 mol

final solution = 25.00 mL + 5.00 mL = 30.00 mL

∴ The value of the concentration of [ OH⁻] in 30.00 mL

  = [ OH⁻] = ( 0.0042 mol / 0.0300 mL )

                = 0.142 M

 hence pOH = - log (0.142) = 0.849

Final step; The pH of the solution after 5 mL of titrant is added

= 14 - pOH

= 14 - 0.849 = 13.15

Hence we can conclude that the initial pH before titrant was added is 13.50 and the pH after is as listed above.

Learn more : https://brainly.com/question/23313870

Answer:

Explanation:

Intermolecular forces are the forces that hold the molecules together in a substance. The state in which this substance will be at normal atmospheric conditions, and other physical properties such as boiling and melting points, are a consequence of the intermolecular forces.

The type of intermolecular force that happens in nonpolar compounds is dispersion forces. The atom or nonpolar molecule will be disturbed by the proximity of an ion or a polar molecule, thus shifting its electron cloud. The atom or nonpolar molecule will be an induced dipole.

In these tetrahedral molecules, which are not polar, the attractive forces will be London forces, which arise as a consequence of temporary induced dipoles.

Since these forces depend on proximity (the closer the proximity the larger the attraction) those molecules with a higher molar mass will have a larger electron cloud, which will be more susceptible to the effect of an induced dipole in the surroundings (the electrons are on the outer layers will be less attracted by the nuclei).

CF₄  > CCl₄ > CBr₄ >Cl₄

--------------------------------> Increasing size

--------------------------------> Increasing melting point

The melting point increases as the molecules get bigger, that is, as the number of molecules in the molecule increases.

Answer:

Elements

Explanation:

I did a quiz I'm 11 hope it helps\

Answer:

try a dude ummm yes ok yeah

Answer: A and D

Explanation:

I hope this helps. Sorry if I’m wrong

Answer:

Region D

Explanation:

The region is on the tectonic plate boundaries.

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{5 \times 633}{920} = \frac{3165}{920} \\ = 3.440217...[/tex]

We have the final answer as

Hope this helps you

Answer:

* [tex]HI (aq) +NaOH (aq) \rightarrow NaI(aq)+H_2O(l)[/tex]

* [tex]H_2CO_3 (aq) + Sr(OH)_2\rightarrow SrCO_3(s)+2H_2O(l)[/tex]

* [tex]Ca(OH)_2 (s) +H_2SO_4 (aq)\rightarrow CaSO_4(aq)+2H_2O(l)[/tex]

Explanation:

Hello!

In this case, since neutralization chemical reactions are carried out when an acid and a base react to produce a salt and water, for the first reaction, HI (aq) and NaOH (aq), we can write:

[tex]HI (aq) +NaOH (aq) \rightarrow NaI(aq)+H_2O(l)[/tex]

Whereas the salt, sodium iodide remains aqueous and water liquid. Next, when carbonic acid and strontium hydroxide react, strontium carbonate as the salt precipitates out and water is also produced:

[tex]H_2CO_3 (aq) + Sr(OH)_2\rightarrow SrCO_3(s)+2H_2O(l)[/tex]

Finally, when calcium hydroxide and sulfuric acid react, the compound calcium sulfate as the salt and water are produced as shown below:

[tex]Ca(OH)_2 (s) +H_2SO_4 (aq)\rightarrow CaSO_4(aq)+2H_2O(l)[/tex]

Best regards!

Answer:

a simple covalent structure

Explanation:

its has a few non-metal atoms?

Explanation:

that u know right .........................

Answer:

all for it 8) !! i have several friends that are trans in fact.

Explanation:

ppl that don't support trans peeps are going to get punted into the sun with no mercy

im nonbinary, but also identify as trans too (the white stripe on the transgender flag is actually "for those who are transitioning or consider themselves having a neutral or undefined gender," according to Monica Helms, who made the most commonly seen trans flag. :]  they don't all identify as trans but can if they want to.

also, a common misconception is that all nonbinary people have to/use they/them pronouns, which is not true. they can use whatever they want because pronouns do not equal gender in most cases. also because they don't have to be put into a strict box of what you can and can't use.

Answer:

A) species

Explanation:

Of the Linnaeus's groupings, organisms at the species level are the most closely related to one another.

The species level is the lowest level of classification in the Linnaean system of classification.

Answer: 68.6 mL

Explanation:

We need to use the equation M1V1=M2V2. Molarity's units are in L so we need to convert the 50 ml into L (divide by 1000).

.05(.298)=(x)(.2173)

x = .068 L

to convert to mL we multiply by 1000

.068*1000=68.6 mL

Answer:

Explanation:

2N₂O(g) → 2N₂(g) + O₂(g)

molecular weight of N₂O = 44

∆Hº = –166.7 kJ/mol

44 g of N₂O decomposes to give 166.7 kJ of heat

2.25 g of N₂O decomposes to give 166.7 x 2.25 / 44 kJ of heat

= 8.51 kJ of heat .

Answer:

Please mark as brainliest

Explanation:

Ans: Kinetic energy

Another example of kinetic energy is the energy associated with the constant, random bouncing of atoms or molecules. This is also called thermal energy – the greater the thermal energy, the greater the kinetic energy of atomic motion, and vice versa

The energy associated with the random motion of particles in a gas is kinetic energy.  

• A form of energy, which an object or a particle possesses due to its motion is known as kinetic energy.  

• It is a characteristic of a moving particle or object and relies not only upon its motion but also on its mass.  

• The particles of solid are closely packed and thus they cannot move around, therefore, they possess the least kinetic energy.  

• The particles of a liquid are less closely clustered, thus they move around and therefore possess more kinetic energy in comparison to solids.  

• The gas particles are very loosely packed and possess the tendency to move around spontaneously, and therefore, possess very large kinetic energy.  

Thus, kinetic energy is a form of energy associated with the random motion of gas particles.

To know more about:

https://brainly.com/question/2604319

Answer:

1.47 x 10⁻¹⁹J

Explanation:

Given parameters;

Frequency of wave  = 2.22 x 10¹⁴/s

Unknown:

Energy of the photon = ?

Solution:

The energy of a photon can be mathematically derived using the expression below;

        E = hf

  E is the energy

 h is the Planck's constant = 6.63 x 10⁻³⁴m²kg/s

 f is the frequency  

Insert the parameters and solve;

 E = 6.63 x 10⁻³⁴m²kg/s x  2.22 x 10¹⁴/s  

 E = 14.7 x 10⁻²⁰J or 1.47 x 10⁻¹⁹J

Given :

The pressure of 50.0 mL of oxygen gas at 100 ºC increases from 735 mm Hg to 925 mm Hg.

Temperature remains constant.

To Find :

The final volume.

Solution :

735 mm Hg = 0.967 atm

935 mm Hg = 1.230 atm

We know, at constant temperature :

[tex]P_iV_i=P_fV_f\\\\V_f=\dfrac{P_iV_i}{P_f}\\\\V_f=\dfrac{0.967\times 50}{1.230}\\\\V_f=39.31 \ mL[/tex]

Therefore, final volume is 39.31 ml.

Hence, this is the required solution.

Answer:

inertia

Explanation:

Answer:

7.79 × 10³ L

Explanation:

Step 1: Calculate the total number of moles of carbon dioxide released

50 moles of carbon dioxide are released per hour. The moles released in a six-hour period is:

6 h × 50 mol/1 h = 300 mol

Step 2: Convert the temperature to the Kelvin scale

When working with gases, we need to consider the absolute temperature. We can convert from Celsius to Kelvin using the following expression.

K = °C + 273.15

K = 35 °C + 273.15 = 308 K

Step 3: Convert the pressure to atm

We will use the conversion factor 1 atm = 760 Torr.

740 Torr × 1 atm/760 Torr = 0.974 atm

Step 4: Calculate the volume of the gas

We will use the ideal gas equation.

P × V = n × R × T

V = n × R × T / P

V = 300 mol × (0.0821 atm.L/mol.K) × 308 K / 0.974 atm

V = 7.79 × 10³ L

Answer:

2.938 mol Pb(NO₃)₄

Explanation:

Step 1: Given data

Step 2: Write the balanced equation

4 (NH₄)₃PO₄ + 3 Pb(NO₃)₄ = Pb₃(PO₄)₄ + 12 NH₄NO₃

Step 3: Calculate the number of moles of Pb(NO₃)₄required to produce 11.75 moles of NH₄NO₃

The molar ratio of Pb(NO₃)₄ to NH₄NO₃ is 3:12.

11.75 mol NH₄NO₃ × (3 mol Pb(NO₃)₄/12 mol NH₄NO₃) = 2.938 mol Pb(NO₃)₄

The element you are looking for is Scandium, the 4th element in the third group.

Atomic bombs use much higher enrichment material with over 90% of U235 to create a massive chain reaction and produce a large amount of energy at one time. The control rods in a nuclear reactor are used to control the speed of the chain reaction and can capture free neutrons before they collide with U235 atoms.

you can thank safari. ♥

Answer:

Atomic bombs use much higher enrichment material with over 90% of U235 to create a massive chain reaction and produce a large amount of energy at one time.

Explanation:

Answer:

a. K = [H+][NO2-]/[HNO2]

Explanation:

The computation of the expression of the equilibrium constant is shown below:

Given that the weak acid is HNO_2 that exist in the solution that aqueous

The dissociation equation of [tex]HNO_2[/tex]

[tex]HNO_2(aq) \rightarrow NO_{2}^{-} (aq) + H^{+}(aq)[/tex]

Now

Acidionization constant i.e.

[tex]k_a = \frac{[NO_{2}^{-}][H^{+}]}{HNO_{2}}[/tex]

Therefore the correct option is a.

Hence, the same is to be considered

Answer:

3.37kg of NaCl is the salt content of the dead sea

Explanation:

A concentration of 33.7% means there are 33.7g of NaCl in 100mL of solution.

To solve this question we need to convert 10.0L to mililiters, and then, solve for the mass of NaCl in grams and convert it to kg:

Volume in milliliters:

10.0L * (1000mL / 1L) = 10000mL

Mass of NaCl:

10000mL * (33.7g NaCl / 100mL) = 3370g NaCl

In kg:

3370g * (1kg / 1000g) =

Answer:

it is a chemical change

Explanation:

Common physical changes include melting, change of size, volume, color, density, and crystal form. The classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.