Sara wanted to perform a scientific experiment relating the effect of ultraviolet (UV) light on the survival rate of microscopic protists in pond water. She went to a local pond and collected a large bucket of pond water, then poured 500 milliliters of the pond water into each of two identical glass jars. She viewed a small sample of the pond water under a compound light microscope to verify that the water contained multiple species of microscopic protozoa. She was also able to get a rough count of the organisms in her sample using a special microscope slide. To set up her experiment Sara took one of the glass jars with pond water and protists, labeled it “100”, and placed it 10 centimeters under a lamp that transmits 100% UV light. The other jar, she labeled “O” and placed it 10 centimeters under a lamp that transmits 0% UV light. After the pond water/protist mixture in both jars was exposed to the lights for 8 hours, she collected samples from both jars. She used the same procedure as before and made a 2nd count of the microorganisms to compare to her first count.

12. If Sara were to graph her data using a bar graph, what should her axes be labeled?
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Answer:

Explanation:

Hey there!

From question;

The molecular mass of NH₄OH is 35.

Avogadro number = 6.023*10²³ molecules.

Then,

From mole concept,

Molecular mass =  Avogadro number

So, 35 grams contains  6.023*10²³ molecules.

1 gram contains [tex]\frac{ 6.023*10^{23} }{35}[/tex] molecules.

52.1 grams contains [tex]\frac{6.023*10^{23} }{35} *52.1[/tex] molecules.

Therefore, 52.1 grams contains 8.96*10²³ molecules.

Hope it helps!

TRUE  CO(OH)₂ will precipitate from the solution if the pH of a 0.020 M solution of CO(NO₃)₂ is adjusted. ; ( TRUE )

Given that:

Ksp of CO(OH)₂ =  1.3 * 10⁻¹⁵

Chemical reaction

CO⁺² + 2OH  ---->  CO(OH)₂

First step : determine the pOH value

pOH of solution = 14 - pH

                          = 14 - 8.5 = 5.5

Also

pOH = - log [ OH⁻ ] = 5.5

Therefore :  [OH⁻] = - Antilog ( 5.5 )

                              = 3.16 * 10⁻⁶

[CO⁺²] = 0.02 given that it is obtained from 0.02 M solution of cobalt nitrate

Next step : determine the Ionic product of cobalt hydroxide

Ionic Product ( IP ) = [CO⁺²] [OH⁻]²

                              = 0.02 * ( 3.16 * 10⁻⁶)²

                              = 1.99 * 10⁻¹¹

Given that the Ionic product is greater than the Ksp of CO(OH)₂ therefore CO(OH)₂ will precipitate

Hence we can conclude that TRUE  CO(OH)₂ will precipitate from the solution if the pH of a 0.020 M solution of CO(NO₃)₂ is adjusted. ; ( TRUE )

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Answer: Zr or Zirconium

Explanation: Neon has 10 Protons and four times ten is 40. And Zirconium has 40 protons the symbol for Zirconium is Zr

Neon has 10 protons, the element which has four times more protons than Neon in its nucleus is Zirconium(Zr).

To learn more about Proton, refer to https://brainly.com/question/1805828

#SPJ2

Answer:

539.35 g

Explanation:

molar mass of Mg = moles of Ag * molar mass of Ag

x = 5 * 107.87

x = 539.35 g

Answer:

2.408 moles of hydrogen are in the sample.

Explanation:

Molecular formula of acetic acid =CH3COOH

Ratio of carbon to hydrogen :2/4:1/2

Measured  number of moles of carbon atoms = 1.204

Let the moles of hydrogen be = x

Number of carbon atoms in 1.204 mol = 1.204mol*Avogadro number

Number of hydrogen atoms in x mol = x*Avogadro number

As we know that ratio of carbon to hydrogen atoms is 1:2.

1/2=1.204mol* avogadro/ x* avogadro

x = 2.408 moles

2.408 moles of hydrogen are in the sample.

Answer:

9.033 × 10²³ molec C₂HF₃O₂ x (2 O atoms / 1 molec C₂HF₃O₂) = 1.8066 x 10²⁴ O atoms

There are 3.01 × 10^23 atoms of oxygen in 1.51×10^23 molecules of trifluoroacetic acid, C2HF3O2.

The formula of trifluoroacetic acid is C2HF3O2

Number of moles of the trifluoroacetic acid(C2HF3O2)is given using the approach;

1 mole of the compound contains 6.02 × 10^23 molecules

x moles of the compound contains 1.51 × 10^23 molecules

x = 1.51 × 10^23 molecules × 1 mole /6.02 × 10^23 molecules

x = 0.25 moles of  trifluoroacetic acid.

Now;

Number of O atoms in the sample = 0.25 × 2 × NA

Where; NA = Avogadro's number

Number of O atoms in the sample = 0.25 × 2 × 6.02 × 10^23 atoms

= 3.01 × 10^23 atoms

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Sn(ClO3)2 -> SnCl2 + 3O2

Explanation: There should be equal amounts of each element on both sides. This assumes it’s referring to Sn 2+, and not Sn 4+.

The balanced chemical equation will be:

[tex]\rm \bold{(SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;3\;O_2}[/tex]

Stannous chlorate has been also known as Tin chlorate. The compound has been a white crystalline powder and has been used for the sensitization of the metal.

The decomposition of Stannous chlorate under the influence of heat has resulted in the formation of stannous chloride and oxygen gas.

The reaction can be given as:

[tex]\rm (SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;O_2[/tex]

The number of atoms on the reactant and the product side is not equal. By putting the coefficient to the compound, the reaction can be balanced. The balanced chemical equation will be:

[tex]\rm \bold{(SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;3\;O_2}[/tex]

For more information about the balanced chemical equation, refer to the link:

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Answer:

that not of i grade sorry

Explanation:

Answer:

no

Explanation:

Weight is a measure of how much gravity pulls on a mass or object. On the moon, there is less gravity pulling on objects, so they weigh less. ... But does its mass changejust because it is on the moon? No, it is still the same size and looks the same, it just has less gravity pulling on it, so it weighs less.

This indicates that in the compound QT the bond is principally ionic in character. It is a fundamental type of chemical bond.

An ionic bond is a type of chemical bond between two atoms due to the attraction between two opposite ions.

These opposite ions in an ionic bonding are referred to as negative ions and positive ions.

An ionic bonding only occurs when the electrons (e-) of a given atom can be transferred to other atoms in the compound.

Learn more about ionic bonds here:

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Answer:

Your question will be shared anonymously with online publishers who may be interested in answering it

Explanation:

make me as brain

Answer:

indeed it 1s22s22p63523p645230104p5 is bromine

elements increase in reactivity as they go down in groups and up in periods!!

Answer:

NO3-

Explanation:

edge2020

no3-Edg 2020

Explanation

Brainliest

Answer:

Explanation:

The protein comprises of two 60-kD polypeptides and two 40-kD polypeptides. Each one of the 40-kD chains has a disulfide-bond which is directly bonded to a 60-kD chain.

The 100-kD units attach noncovalently to produce a protein with a molecular mass of 200 kD. The interaction among the different subunits in the protein is not affected by the Gel filtration chromatography.

Hence, the protein seems to be 200 kD in size. When SDS-PAGE takes place samples are being subjected to heat and therefore undergoing denaturation conditions. The aftermath effect of this causes disorganization in the 100 kD units.

However, the reducing agent (BME) main task is the reduction of disulfide bonds in a protein.

It implies that BME is responsible for the reduction between the R1-S-S-R2 bond between 40 kD and 60 kD to R1-SH and R2-SH, resulting in seperate proteins.

Answer:

d) It incorrectly describes the two processes

Hope it helps you

And please mark it as the brainliest answer

Answer:

The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.

Explanation:

Solubility is affected by temperature due to heatness.

Answer:

francium

Explanation:

the atomic radius increases from top to bottom in a group, and decreases from left to right across a period.

Explanation:

Nitride ion > Fluoride ion > Magnesium ion > Aluminum ion

Answer:

Allotrope of carbon.

High melting point.

Explanation:

Answer:

Density lower than that of diamond.

It has soft, slippery feel.

Answer:

Explanation:

fe-45 and O-15 im sure :)

Answer:

Triphorphorus Pentanitride

Explanation:

since there are three phosphorus use the prefix tri-, since there are five nitrogen use the prefix penta. tri=3, penta=5. then add a suffix -ide to the end of nitrogen. that will give you triphosphorus pentanitride.

Answer: As air is heated its density decreases because its mass remains constant but its volume increases. As air is cooled, its density increases because its mass remains constant but its volume decreases. ... The decrease in density as air is heated causes it to rise above cooler, more dense air. Hope this helped.

Answer:

They experiment, and study

Explanation:

Repeat your experiments several times to make sure that the first results weren't just an accident.

Answer:

Explanation:

In this problem, we have 50.0 g of solute and 150.0 g of water. The total mass of the solution will thus be 50.0 g + 150.0 g = 200.0 g. The mass percent will be 50.0g/200.0 g (x100%) = 25.0 %.

Mass percent of a solution can be defined as grams of solute per 100 grams of solution.  In this problem, we have 50.0 g of solute and 150.0 g of water.  The total mass of the solution will thus be 50.0 g + 150.0 g = 200.0 g.  The mass percent will be 50.0g/200.0 g (x100%) = 25.0 %.  You can also look at it another way.  Since you have 50 g solute in 200 g solution, you will have 25 g solute in 100 g solution.  By the definition provided above, this is a 25% by mass solution.

Answer: Chemistry is the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.

Explanation:

Answer:

The scientific study of the structure of substances and what happens to them in different conditions or when mixed with each other is known as Chemistry.

Each element is given its own chemical symbol, like H for hydrogen or O for oxygen. Chemical symbols are usually one or two letters long. Every chemical symbol starts with a capital letter, with the second letter written in lower case. For example, Mg is the correct symbol for magnesium, but mg, mG and MG are wrong...

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Answer:

15.5343

Explanation:

Answer:

Changes can occur to physical properties of a substance, but the chemical composition of the substance remains