Based on the given information, which of the following is the students' correct conclusion about their experiment?

Answers

Answer 1

Answer:kj

Explanation:nnn


Related Questions

6. There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu. What does this say about the relative abundances of the three isotopes?

Answers

Answer:

That means that the isotope that has a mass number of 28 is probably the most abundant. This is because your average atomic mass is 28.086 amu, which is closest to 28.

Formula used to calculate average atomic mass follows:

average atomic mass=(atomic mass of an isotope)*(fractional abundance)

we are given=

Three isotopes of Silicon, which are Si-28, Si-29 and Si-30.

Average atomic mass of silicon = 28.086 amu

As, the average atomic mass of silicon is closer to the mass of Si-28 isotope. This means that the relative abundance of this isotope is the highest as compared to the other two isotopes.

Percentage abundance of Si-28 isotope = 92.2%

Percentage abundance of Si-29 isotope = 4.7 %

Percentage abundance of Si-30 isotope = 3.1%

Hence, the abundance of Si-28 isotope is the highest as compared to the other isotopes.

A copper rod takes up 75 mL of space. With a density of 8.96 g/mL, what is the mass of the rod

Answers

5.73 is the mass of the rod

Which of the following is an example of Newton’s 2nd Law? A. A bowling ball requires more force to roll than a tennis ball B. Sitting in a chair C. A rocket blasting off D. All of the above

Answers

Answer:

The answer is A.

Explanation:

What is the molar mass of H2SO4?

Answers

Answer:

98.08g/mol is your answer

Explanation:

hope this helps

write this number in scientific notation 41, 820, 000

Answers

Answer:

4·1×10∧-7

Explanation:

[tex]\mathrm {Hey, there!}[/tex]

Let's solve your problem -

The answer to the question is 4.18 10^7.

Here is my clarification/explanation to support:

To convert a standard number to scientific notation, we have to move the decimal point up until we have a 1 digit number.

When we keep moving the decimal point, we get 4.18

Now, we will count the numbers after the 8 to get the 10 area.

There are five numbers after the 8, so we get 10^5.

Now, we will add 2 more to the 5, we get 10^7

Our answer will be: 4.18 10^7

[tex]\mathrm {Best, of, Luck!}[/tex]

A student investigated the time taken for amylase to breakdown a 10% starch solution into glucose at
37°C. The student repeated the investigation five times
Figure 11 shows the results
time taken for amylase to produce glucose (s)
Test 4
120
125
110
115
Figure 11
() Calculate the rate of amylase enzyme activity for the 10% starch solution.

Answers

Answer:

Phenolphthalein is an indicator. It is pink in alkaline solutions and turns colourless as the pH decreases.

It can be used to measure the activity of the enzyme lipase on the breakdown of lipids.

Samples of milk containing phenolphthalein were incubated with lipase at different temperatures.

The time taken for the phenolphthalein to turn colourless was recorded and used to calculate the rate of enzyme activity.

Figure 10 shows these results.

Picture

(a) (i) Explain why phenolphthalein turns colourless when lipase breaks down the lipids in milk. (2)

(ii) Describe the effect of temperature on the activity of lipase, as shown in Figure 10. (2)

(iii) Explain why the activity of lipase changes above a temperature of 40°C. (2)

(b) A student investigated the time taken for amylase to breakdown a 10% starch solution into glucose at 37°C. The student repeated the investigation five times.

Which statement describes how chemical formulas, such as H2O, represent compounds?

They show the types of molecules that make up an atom.
They show the elements that make up a compound.
They show the three-dimensional shape of a molecule.
They show the types of bonds that exist between elements.

Answers

Answer:  B. They show the elements that make up a compound

Explanation:

Answer:

B

Explanation:

How do you calculate wavelength and frequency?​

Answers

Answer:

Wavelength can be calculated using the following formula: wavelength = wave velocity/frequency. Wavelength usually is expressed in units of meters. The symbol for wavelength is the Greek lambda λ, so λ = v/f.

Explanation:

Just a formula that's commonly used in biology.

Which option is an Ionic Compound
A.LiCl
B.CO
C.No2
D.So3

Answers

Answer:

LiCI

Explanation:

CO and No2 are both covalent compounds and it was a 50 50 and I guessed the right answer.

The one that is an ionic compound is LiCl. The correct option is A.

What are ionic compounds?

Ionic compounds are those compounds that have one negative and one positive charge molecule. When this negative and positive charge joins together, the compound becomes neutral.  Electrostatic force joins these elements.

LiCl is a salt that is formed by the joining of lithium with chloride. Lithium is positively charged and chlorine is negatively charged. One identity of this compound is that it is a neutral salt, so it can be identified as an ionic compound. When they disjoint, they form a crystal-like structure.

An example of an ionic compound is sodium chloride, in which sodium is positive and chloride is negative.

Therefore, the correct option is A. LiCl.

To learn more about ionic compounds, refer to the link:

https://brainly.com/question/9167977

#SPJ2

3. How many moles are in 1.49 x 1023 molecules of iodine?

Answers

Answer:

The answer is 0.25 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{1.49 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1.49}{6.02} \\ = 0.247508305...[/tex]

We have the final answer as

0.25 moles

Hope this helps you

Continental waters are classified into two categories Lentic and Lotic. Ecosystem has flowing waters; such as creeks, streams, rivers, springs, brooks and channels. A lentic Ecosystem has still waters such as ponds, marshes,ditches, reservoirs, and lakes. The ecosystem of Lentic and Lotic waters includes biotic (Living) interactions between plants, animals and micro- organisms, and abiotic (non living) physical and chemical interactions.

A) Fish
B) algae
C) Bacteria
D) water flow

Answers

Answer:

it is D

Explanation:

Which of the choices is an example of an element?
O CO
O Co
O C2H2O2
O CO2

Answers

Answer:

Co(cobalt) is the answer

Explanation:

Cobalt is a chemical element with the symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth's crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.

different type of flatbread

Answers

All I know is Pita lol

The question asks me to classify the reaction
CO2 (g)+H20(1) H2CO3 (aq)​

Answers

H2O(l) + CO2(g)=H2CO3(aq)
It would be combination reaction.

How would you ask a girl out. I know that I can use my voice, but I don’t know what to say.

Answers

Answer:

Just go out there and be yourself brother!

Explanation:

If she doesn't like you, she doesn't like the real you, therefore you don't deserve her! lol

Mention any three ways of making salt. (please help me Asap)​

Answers

Solar Evaporation Method. This is the oldest method of salt production. ...
Rock Salt Mining Method. Morton also uses the second oldest method of producing salt – underground mining. ...
Vacuum Evaporation Method.

NEED HELP ASAP!!!!! PLEASE HELP!!!!! NEED HELP ASAP!!!!!

Directions: Name the covalent compound created.
EXAMPLE- Sr3P2= Tristrontium diphosphide

CH4 =
B2Si =
N2O5 =
CO2 =

Answers

Answer:

CH4 - Methane

B2Si - Diboron monosilicide

N2O5 - Dinitrogen pentoxide

CO2 - Carbon dioxide

Explanation:

When it comes to naming covalent compounds, there are several rules.

The name is derived based on the formula. For example, N2O5. The first element is nitrogen. To the name of the element, you add the prefix that tells us how many of its atoms are in the compound. In this case, there are two atoms, which means that the prefix will be di- (dinitrogen). The second element is oxygen. You are supposed to take only the root of the second element's name and then add the prefix denoting the number of its atoms and the suffix -ide (pentoxide). This is how we'll get dinitrogen pentoxide.

The only exception is methane (CH4), which is an organic compound. Organic compounds are named using the IUPAC nomenclature.

Which option will increase the rate of reaction?​

Answers

Answer:

Explanation:

there's no options that you put but usually if you add more of the reactant the rate will increase, adding a catalyst will increase the rate, and increasing the temperature if it's endothermic

Pleaseeesseeeeesssseredseeeesss

Answers

Answer:

B. Electrons travel through the sol

Explanation:

thats your answer :)

which best explains why a scientist would share these details in a conference?


a it tells the audience if the results support or contradict the hypothesis

b it tells the peers if the study is supported by mathematical models

c it informs the peers of the results are supported by other scientists

d it informs the audience if the study included controlled tests

Answers

The question is incomplete, the complete question is; During a conference presentation, a scientist described the materials that she used and how she performed her experiments.

Which best explains why a scientist would share these details in a conference?

It tells the audience if the results support or contradict the hypothesis.

It tells the peers if the study is supported by mathematical models.

It informs the peers if the results are supported by other scientists.

It informs the audience if the study included controlled tests.

Answer:

It informs the audience if the study included controlled tests.

Explanation:

Usually, scientific conferences involve presentation of papers by scientists. These paper presentations are actually the sharing of details of the scientific research carried out by other scientists.

Presenting the materials and methods section of the a research project  to a scientific conference informs the audience if the study included controlled tests.

The inclusion of controlled tests in a scientific study enhances the validity of the results obtained in the study.

BRAINLIEST! Please help me answer the following questions:

1) How do you find the valency of an element?

2) How do you determine if an element is nuetral/an isotope/ or an ion?


If you could help with 1 or both questions I would really appreciate it :)

Answers

Explanation:

1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.

if u looking for N it is from group 5A so its valency is -3

so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A

for the transition metals and simimetals other rules.

2) neutral if the element does not hold any charge like

H2, O2, N2, Fe, Au, Cu ...

isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.

if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)

F- then it is fluoride anion (-ion)

if u have any doubt just writ a comment ( ;

Tubbo or TommyInnit? Choose wisely.

Answers

Answer:

Tubbo

Explanation:

more informational

Tubbo is my top pick

:answer question number 10

Answers

Answer:

the last one

Explanation:

I'm pretty sure

Answer:

Particles on each are constantly moving (the last one)

Each atom of an element has the following electron configuration.

1s22s22p63s23p64s23d104p65s24d105p5

What is the name of the element?

Answers

That would be Iodine

What are the parts of an electron configuration?

Answers

Answer:

Explanation:

electronic confirmation=1s^2,2S^2,2P^6,3S^2

atomic no.is 12 therefore :- this is magnesium

Period=3

Block=s-block

Group=II A

Please answer it!! Would appreciate it!

Answers

[tex] \sf \: Answer \: 8 \: :[/tex]

→ During the formation of a chemical bond, heat is released.

[tex] \sf \: Answer \: 9 \: :[/tex]

→ Solution that contains all the solute it can hold at a given temperature is saturated.

[tex] \sf \: Answer \: 10\: :[/tex]

→ No. of neutrons present in Bromine are 44

Chemical bonding is the combining of elementa to form

-energy levels
-atoms
-electrons
-compounds

Answers

The answer is compounds.

A chemist titrates 100.0 mL of a 0.3065 M aniline (C6H5NH2) solution with 0.5774 solution at 25 . Calculate the pH at equivalence. The of aniline is .

Answers

Answer:

4.91

Explanation:

From the given information:

The millimoles of aniline = 100* 0.3065 = 30.65

30.65 millimoles HNO3 must be added to reach the equivalence point.

30.65 = V x 0.5774

V = 30.65/0.5774

V = 53.08 mL HNO3 must be added

Thus, total volume = 53.08 + 100 = 153.08 mL

[salt] = 30.65 /  153.08 = 0.20022 M

At equivalence point :

pOH = 1/2 [pKw + pKb + logC]

pOH = 1/2 [14 + 4.87 + log 0.20022 ]

pOH =9.086

pH = 14 - 9.086

pH = 4.914

pH ≅ 4.91 to 2 decimal places.

what is the ionic compound formula sodium nitride?​

Answers

Answer:

In ionic compounds, the charges of constituent ions must balance. This can be achieved by having three sodium ions per nitride ion. Therefore, the formula of sodium nitride is Na3N

Explanation:

Answer:

the charges of constituent ions must balance. This can be achieved by having three sodium ions per nitride ion. Therefore, the formula of sodium nitride is Na3N

Explanation:

WILL GIVE BRANLIEST!!

Carbon tetrachloride (CCl4) is
ionic
covalent

Answers

Answer:

Covalent

Explanation:

In the carbon tetrachloride molecule, four chlorine atoms are positioned symmetrically as corners in a tetrahedral configuration joined to a central carbon atom by single covalent bonds

Answer:

Carbon tetrachloride (CCl4) is ✔ covalent.

Answers to assignment question:

What properties would you expect for CCl4? Select all that apply.

It is likely a gas or liquid at room temperature.

It is likely soluble in water.

It will likely light up a bulb in a conductivity apparatus.

It will likely have a high melting point.

Calcium oxide (CaO) is ✔ ionic.

What properties would you expect for CaO? Select all that apply.

It is likely a gas or liquid at room temperature.

It is likely soluble in water.

It will likely light up a bulb in a conductivity apparatus.

It will likely have a high melting point.

Explanation:

all correct on edge! :D

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