Which of the following items would improve the experiment? Add more types of plants Test one plant with no fertilizer Use different soils for each plant Expose all six plants to green light

Answer:

fkv  SFHHHHHHHHHCB FSSSSZCHJjjjb .SFFHHHHHHHHC

Explanation:

What do you notice about the relationship between the force strength and the size of the velocity change?

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Answer:

6.976%

0.0152 M

Explanation:

Step 1: Write the balanced chemical equation

Ba²⁺(aq) + H₂SO₄(aq) ⇒ BaSO₄(s) + 2 H⁺(aq)

The balanced net ionic chemical equation is:

Ba²⁺(aq) + SO₄²⁻(aq) ⇒ BaSO₄(s)

Step 2: Calculate the moles corresponding to 0.5376 g of BaSO₄

The molar mass of BaSO₄ is 233.39 g/mol.

0.5376 g × (1 mol/233.39 g) = 2.303 × 10⁻³ mol

Step 3: Calculate the moles of Ba²⁺ that produced 2.303 × 10⁻³ moles of BaSO₄

The molar ratio of Ba²⁺ to BaSO₄ is 1:1. The moles of Ba²⁺ are 1/1 × 2.303 × 10⁻³ mol = 2.303 × 10⁻³ mol.

Step 4: Calculate the mass corresponding to 2.303 × 10⁻³ moles of Ba²⁺

The molar mass of Ba²⁺ is 137.33 g/mol.

2.303 × 10⁻³ mol × 137.33 g/mol = 0.3163 g

Step 5: Calculate the mass percent of barium in the original sample

0.3163 g of barium ion were in a 4.534 g-sample. The mass percent of barium ion is:

0.3163 g/4.534 g × 100% = 6.976%

Step 6: Calculate the molar concentration barium in the 152 mL of solution

2.303 × 10⁻³ moles of barium ion were in 152 mL (0.152 L) of solution. The molarity of barium ion is:

M = 2.303 × 10⁻³ mol/0.152 L = 0.0152 M

Answer:

Mushroom cells

Explanation:

They are mushroom cells because they are together.

Answer:

coochie man? lol it's probably D or B :D

Answer:

drill bits

Explanation:

I don't think that you would use gemstones in anything else.

Answer:

1.7

Explanation:

The formula to be used here is;

pH = -log[H⁺]

To determine the concentration of H⁺ of the nitric acid (HNO₃), formula for molarity is used

Molarity = number of  moles/volume (in dm³ or L)

number of moles (n) = given mass/molar mass

Molar mass of HNO₃ = 1 + 14 + (16 x 3)

= 63g

given mass (in grams) = 320mg⇔0.32g (where 1000mg = 1g)

Thus; n = 0.32/63

n = 0.0051 moles

Volume of acid = 290 mL ⇔ 0.29 L (where 1000 mL = 1L)

Molarity = n/volume;

0.0051/0.29

Molarity = 0.018M

pH = -log 0.018

pH = 1.7

Answer:

Quantitative Observations

Explanation:

Answer:

The mass of object is 0.5 Kg.

Explanation:

Given data:

Acceleration of object = 12.0 m/s²

Force on object = 6.0 N

Mass of object = ?

Solution:

Formula:

F = m×a

F = force

m = mass

a = acceleration

Now we will put the values in formula.

6.0 N = m  × 12.0 m/s²

m =  6.0 N / 12.0 m/s²  

   ( N = kg.m/s²)

m = 0.5 kg

The mass of object is 0.5 Kg.

Answer:

there are three different subatomic particles inside them: the protons, neutrons, and electrons

Answer:

1 × 10⁻² M

Explanation:

Step 1: Given data

Absorptivity of a dye (ε): 1 × 10² cm⁻¹M⁻¹

Absorbance (A): 1.0

Length of the cuvette (l): 1 cm

Concentration of a dye (C): ?

Step 2: Calculate the concentration of the dye

We will use Beer's Law.

A = ε × l × C

C = A / ε × l

C = 1.0 / 1 × 10² cm⁻¹M⁻¹ × 1 cm

C = 1 × 10⁻² M

The concentration of the dye is 1 × 10⁻² M.

Answer:

Yes

Explanation:

Or maybe i dont really know what it mean

Explanation:

Label A: oceanic - oceanic

Label B: oceanic - continental

Label C: continental - continental

Answer:

Oceanic-continental convergence---- letter B.  

Oceanic-oceanic convergence ---- letter A.

Continental-continental convergence ---- letter C

plz mark brainliest

Answer:

The total number of atoms is 12 + 22 + 11 = 45, so carbon atoms are 12/45 of the total.

Explanation:

Answer:

20 degree and 4000000N

Answer:true

Explanation:

The neutrons and the protons are what stay there

Answer:

Hope it help you

Stayhomestaysafe

Plz mark my answer brainliest✍️✍️

Explanation:

Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes. Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat.

REAL NAME - SHRESTH DUBEY

Answer:

Can be used to do work,and it can be converted to potential.

Explanation:

Answer: can it be used to do work

Explanation:

Answer:

There are 40.25 days in 5.75 weeks

Answer: 40.25

Hope this helped! :)

Answer:

0.840

Explanation:

The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.

The moles can be defined as the mass of the compound with respect to the molecular mass. The moles can be given as:

Moles = [tex]\rm \dfrac{weight}{Molecular\;weight}[/tex]

The molecular weight has been the mass of the constituents of the atoms present in the compound.

The compound KBr has a molecular mass of 119 g/mol.

The given mass of the compound has been 100 grams.

The moles of KBr can be given as:

Moles of KBr = [tex]\rm \dfrac{100}{119}[/tex]

Moles of KBr = 0.84 moles.

The 100 grams of KBr have been equivalent to 0.84 moles. Thus, option A is correct.

For more information about the moles, refer to the link:

https://brainly.com/question/2437143

Answer:

Number of molecules = 2.61  x 10²³

Explanation:

Given:

Volume of tetra-chloride = 42 ml

Density = 1.59 g/ml

Find:

Number of molecules

Computation:

Mass = Volume of tetra-chloride x Density

Mass = 42 x 1.59

Mass = 66.78

Molecular mass of tetra-chloride = 154 g/mol

Moles = 66.78 / 154

Moles = 0.4337

0.4337 mole = 0.4337 x Avogadro number

0.4337 mole = 0.4337 x 6.022 x 10²³

Number of molecules = 2.61  x 10²³

Answer:

1.  Can help in development of effective medications

2.  Can help explain genetic diseases

3.  Composed of about 19,000 genes

Explanation:

The other answer options are misleading.

Genetic code of humans can help with understanding more than just human genetics.

Human genetics is composed of 23 chromosome pairs, for a total of 46 chromosomes.

Answer:

Mass = 89.97 g

Explanation:

Given data:

Number of moles of chloride ions = 1.98 mol

Mass in grams of MgCl₂ present = ?

Solution:

we can see that 1 mole of MgCl₂ contain 2 moles of chloride ions. Thus 1.89 moles of chloride ions contain moles of MgCl₂ are,

                  Cl₂          :        MgCl₂

                   2            :          1

                  1.89        :        1/2×1.89 = 0.945

Thus, 1.89 moles of chloride ions are provided by 0.945 moles of MgCl₂.

Mass of MgCl₂:

Mass = number of moles × molar mass

Mass = 0.945 mol × 95.211 g/mol

Mass = 89.97 g

Answer:

a. First order.

b. [tex]k=3.7x10^{-3}s ^{-1}[/tex]

c. [tex]t_{1/2}=187.3s[/tex]

d. [tex][A]=0.111M[/tex]

Explanation:

Hello.

a. In this case since the slope is in s⁻¹ we can infer that the lineal form of the rate law is:

[tex]ln[A]=-kt+ln[A]_0[/tex]

Which is also:

[tex]y=mx+b[/tex]

It means that the reaction is first-order as slope equals the negative of the rate constant which also has units of first-oder reaction.

b. Since the slope is −3.7 x 10−3 s−1 the rate constant is:

[tex]k=-m\\\\k=-(-3.7x10^{-3}s ^{-1})\\\\k=3.7x10^{-3}s ^{-1}[/tex]

c. For first-order reactions, the half-life is:

[tex]t_{1/2}=\frac{ln(2)}{k}\\ \\t_{1/2}=\frac{ln(2)}{3.7x10^{-3}s^{-1}}\\\\t_{1/2}=187.3s[/tex]

d. In this case, since the integrated first-order rate law is:

[tex][A]=[A]_0exp(-kt)[/tex]

The concentration once 220 seconds have passed is:

[tex][A]=0.250Mexp(-3.7x10^{-3}s^{-1}*220s)\\\\[/tex]

[tex][A]=0.111M[/tex]

Regards.

Answer:

Extraction is the action of removing something.

Explanation:

Answer:

the answer is 18,927,06.

Explanation:

I just took the test ; )

Answer:

hi

Explanation:

how r u today

Answer: it should be 2.8

Explanation:

Answer: Here is why,

Explanation: Burning of wood is a example of both physical and chemical change. ... Another example is digestion of food ,first the food is chewed into small pieces this is a chemical change while in the actual digestion process it is chemically broken with the help of digestive enzymes and saliva

Answer:

- The two gases will mix and react.: FALSE.

- The two gases will remain separate and will not mix: FALSE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the -two bulbs will be 6.50 atm.: FALSE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm.: TRUE.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm: FALSE.

Explanation:

Hello.

In this case, given the options, since the total volume of the container includes the both of them, we find that:

- The two gases will mix and react: FALSE, since we do not know the identity of the gases which could be the same or two different inert gases.

- The two gases will remain separate and will not mix: FALSE, since as the valve is opened, the total gas will occupy the entire volume as the volume of a gas is the same to the container based on its constant molecules movements.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 6.50 atm: FALSE, since in this case, by using the Boyle's law for the first compartment we obtain the pressure of the gas there:

[tex]P_2V_2=P_1V_1\\\\P_2=\frac{P_1V_1}{V_2} =\frac{2.00atm*2.00L}{5.00L} =0.8atm[/tex]

Now, we reuse it for the gas at the 3.00-L bulb to find its final pressure:

[tex]P_2V_2=P_1V_1\\\\P_2=\frac{P_1V_1}{V_2} =\frac{2.00atm*3.00L}{5.00L} =2.7atm[/tex]

So the final pressure is:

[tex]P_{TOTAL}=0.8atm+2.7atm\\\\P_{TOTAL}=3.5atm[/tex]

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.50 atm: TRUE considering the total pressure computed above.

- The two gases will occupy a volume of 5.0 L and the final pressure in the two bulbs will be 3.25 atm: FALSE since the final pressure is 3.5 atm.

Regards.