Answer:
the answer is d the nucleus
Explanation:
the nucleus is like in the middle of a cell and I think is the most important.
hope this helps :)
a student investigates the density of an aluminum cola can by submerging it in a measuring cylinder of water. When completely submerged, a full can of unopened cola displaces 337 ml of water. The student then empties the can, she finds that it holds 332 ml of cola and that the mass of the empty can is 13.5g when it's empty. Calculate the density of the aluminum used to make the can.
(I did 337-332= 5ml 13.5g/5ml= 2.7 g/cm^3 . I think I got it wrong)
The density of the can is 0.041 g/mL.
What is the density?The term density is the ratio of the mass to the volume of an object. We know that the volume is an intrinsic property of the substance. The volume does not change thus, it can be used to identify a substance.
Now we have that the volume of the liquid that the can could hold is 332 ml. This is the real volume of the aluminum can. The mass of the can is found to be 13.5g.
Density = mass/volume = 13.5g / 332 ml = 0.041 g/mL
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is a one time explanation of one observation a hypothesis and a scientific theory 100 points
One time explanation of one observation is a hypothesis.
Whenever, an assumption is made juts by observation and without proper testing then that is referred as an hypothesis.
For example- If my friend is late, so I might assume that he or she must have been stuck in traffic. So, this assumption is not tested yet and is made based on my observation. So, this is a hypothesis.
Whenever, a conclusion is given after several experiments and testing after observing something in science is referred as scientific theory.
For example- Atomic theory given by Dalton was based on several experiments. However, theories can also be proved wrong as Dalton's theory was proved wrong later on my JJ Thomson.
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How many moles of ammonia would be required to react exactly with 0.764 moles of copper(II) oxide in the following chemical reaction?
2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)
0.313 moles NH3 moles of ammonia would be required to react exactly with 0.764 moles of copper(II) oxide in the following chemical reaction.
What is a balanced equation?
A balanced equation is one for a chemical reaction where the overall charge and the number of atoms for each component are the same for both reactants and the products. In those other words, the weight and charge of both ends of the reaction are equal.
2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g) is a balanced equation.
The coefficients of the compounds give the mole ratios,
So 2 moles of ammonia (NH3) will react with 3 moles of copper(II) oxide, (CuO).
We use simple proportion or use dimensional analysis
By proportion: 2 mol NH3/3 mol CuO = x mol NH3/0.470 mol CuO and x = 0.313 moles NH3
By dimensional analysis: 0.470 mol CuO x 2 mol NH3/3 mol CuO = 0.313 moles NH3
Therefore, 0.313 moles of NH3 of ammonia would be required to react exactly with 0.764 moles of copper(II) oxide in the following chemical reaction.
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Alien data statements
A 39.2 g sample of copper took
up the 4.4 cm3 of space.
What is the density of the
copper piece in g/cm3?
[?] g/cm³
A 39.2 g sample of copper took up the 4.4 cm³ of space , so the Density of the copper sample is 8.9 g/cm³.
What is density?Density is the ratio of the mass of a substance and the volume occupied by that substance. Density measures how tightly-packed the particles in a substance are the more tightly packed the particles are, the denser the substance will be.
The formula for calculating the density of a substance is given below as:
Density = mass/volume
Given :
The mass of the copper sample = 39.2 g
The volume of the copper sample = 4.4 cm³
Hence, the density of the copper sample will be:
The density of copper sample = 39.2 g/4.4 cm³
The density of copper sample =8.9 g/cm³
Therefore, the density of the copper sample is 8.9 g/cm³
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Answer: 8.9
Explanation: sample of 39.2 grams sample of copper took up to 4.4 centimeters of space. And then you will get the density of the copper piece in g/cm3.
what is the mass of one sheet of paper in (g) of 500 sheets is 5 pounds? show in conversion factor
Answer:
1/5
Explanation:
1/5×500
=so guess this is the one
Guide Questions. 1.) What is the color of the Freshly cut apple/eggplant/potato in glass A and glass B? 2.) What is the color of the apple/ eggplant/potato After 48 hours in glass A and glass B? 3) What is the effect of the exposing the slice of the material in oxygen in glass A and glass B after 48 hours? 4) What is the effect of puting an Vitamin C (as antioxidant that prevents Further oxidantion of apple /eggplant in Glass B?
Freshly-cut eggplant, while uncovered to the air, quickly oxidizes and turns black, kind of the manner an apple goes brown after it is reduced and uncovered to air. the Apple inexperienced eggplant's outer skin is smooth, shiny, and maybe yellow or pale inexperienced.
Leaving slices of apples exposed to the air results in the apple turning an acquainted brown shade. This process, referred to as enzymatic browning, is due to the reaction of positive enzymes with phenolic compounds, both gift inside the apple, that occurs when they may be uncovered to oxygen inside the air.
The eggplant turns brown whilst uncovered to air because a reaction is occurring whilst a cut piece of fruit is exposed to oxygen. this is called enzymatic browning. The call enzymatic browning comes from the truth that an enzyme positioned inside the fruit reacts with oxygen from the air to turn the fruit brown.
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A(n) ___ is equal to the mass of a proton.
electron
nucleus
neutron
electron cloud
Answer:
neutron
Explanation:
A proton is one of three main particles that make up the atom. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms.
You mix 500.0 mL of 0.250 M iron(III) chloride solution with 475.0 mL of 0.350 M barium chloride solution. Assuming the volumes are additive, what is the molarity of chloride ion in the mixture
0.74 mol/lit
You mixed 500.0 mL of 0.250 M iron(III) chloride solution with 475.0 mL of 0.350 M barium chloride solution
As per given in the above statement,
volume of fecl3 = 5oo.ml
fecl3 = 0.250 M
= 0.250 mol/litre
volume of Bacl2, = 175.0mL
Bacl2 = 0.350M
= 0.350 mol/litre
we need to calculate moles of fecl3 and
Bacl2
first :
fecl3= 0.250 mol/litre (Molarity)
moles of FeCl3, = molarity * volume
= 0.250 * 500 ml
= 0.125 moles
moles of fecl3 = 0.125 moles
now, bacl2 = 0.350M
moles of bacl2 = molarity * volume
= 0.350 * 175/1000
= 0.061 moles
furthermore:
one mole of bacl2 will give one mole of ba^+2 and 3 moles of cl-
0.125 moles of fecl3 = 3 * 0.125 cl-
= 0.375 moles of cl-
similarly :
one mole of bacl2 will give one mole of ba^+2 and 2 mole of cl-
= 0.061 moles of bacl2 = 2 * 0.061
= 0.122 moles of cl-
total volume of solution :
= 500 ml + 1750 ml
= 0.675 litre
total number of moles of cl-
= 0.375 + 0.122
= 0.497 moles
now,
molarity of cl- = total moles of solute / volume of solution
= 0.497 moles/ 0.675 litre
= 0.74 mol/lit
molarity of cl- = 0.74 mol/lit
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which of the following is not a unit that could be used for density
A. g/cm3
B.g/mL
C.mL/g
D.kg/m3
Answer:
Explanation:
c
A cube of solid aluminum has a volume of 7.91×103 cm3 and a density of 2.699g/cm3. However, the cube was dropped and you were left with a chunk with a volume of 1.81×103 cm3. How many atoms of aluminum did you lose?
The number of aluminum atoms you lost, given the data from the question is 3.67×10²⁶ atoms
How to determine the number of aluminum atomsWe'll begin by obtaining the mass of the aluminum atoms lost. This is illustrated below:
Original volume = 7.91×10³ cm³ Density of aluminum = 2.699 g/cm³Volume remaining = 1.81×10³ cm³Volume lost = 7.91×10³ - 1.81×10³ = 6.1×10³ cm³Mass of aluminum lost =?Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of aluminum lost = 2.699 × 6.1×10³
Mass of aluminum lost = 16463.9 g
Finally, we shall determin the number of atoms of aluminum lost. This can be obtained as follow:
From Avogadro's hypothesis
1 mole of aluminum = 6.02×10²³ atoms
But,
1 mole of aluminum = 27 g
Thus,
27 g of aluminum = 6.02×10²³ atoms
Therefore,
16463.9 g of aluminum = (16463.9 g × 6.02×10²³ atoms) / 27 g
16463.9 g of aluminum = 3.67×10²⁶ atoms
Thus, 3.67×10²⁶ atoms of aluminum were lost
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Name the following aromatic hydrocarbon: A. chlorobenzene C. chlorohexane -Cl B. chlorohexyne D. benzene chloride
Answer:
A
Explanation:
benzene is an automatic chemical, so a answer A chlorobenzene, had to be the the aromatic hydrocarbon
You are boiling vegetables on the stove and notice the lid of the pot moving up and down Why?
Answer:
cause the pot is probably boiling over making a ton of bubbles and foam
Explanation:
Forensic scientist Samantha Monzon is collecting physical evidence at a crime scene where someone was murdered. What does this process MOST likely involve?
A.
She will place all items in an airtight, plastic container.
B.
She will have to leave weapons such as guns and knives at the scene.
C.
She will need to obtain a search warrant before she collects anything.
D.
She will collect anything that could be related to the crime.
The process which most likely involves collecting physical evidence at a crime scene is she collecting anything that could be related to the crime and is denoted as option D.
What is Crime?This is referred to as unlawful behavior which is punishable by the law of an area or country and examples include theft, murder etc.
When crime takes place such as in the case of a murder, a professional who is referred to as a forensic scientist is invited to the scene so as to collect anything that could be related to the crime as this will help in the investigations by the appropriate bodies and ensure that justice is served.
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Answer: D. She will collect anything that could be related to the crime.
Explanation:
how is the stellar spectrum of Betelgeuse different than the spectra of the other stars in the constellation Orion?
Due to the temperature of the stars the stellar spectrum of Betelgeuse different than the spectra of the other stars in the constellation Orion.
What are constellation Orion?Constellation Orion is defined as a prominent constellation of the orion which has been located on the equator of celestial and it can be visible throughout the whole world. It is the most identified constellations in the sky at night.
Constellation Orion is the most identified constellations in the sky at night. Constellation Orion is defined as a prominent constellation of the orion which has been located on the equator of celestial and it can be visible throughout the whole world.
Therefore, Due to the temperature of the stars the stellar spectrum of Betelgeuse different than the spectra of the other stars in the constellation Orion.
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Conductivity
If it conducts ____ or ____ it allows heat and electricity to ____ through ____
Based on the concept of conductivity, if it conducts heat or electricity, it allows heat and electricity to pass through it.
What is conductivity?Conductivity is the ability of certain materials to allow heat ad electricity to flow or pass through them easily.
Conductivity is the opposite or resistivity or insulation which is the property of material that makes them restrict the movement of heat or electricity through them.
Materials that allow heat and electricity to flow through them easily are called conductors.
Conductors are mostly metallic objects because metals allow heat and electricity to flow through them easily.
Other conductors are the electrolytes which are substances which when in molten form, allow electricity to easily pass through them.
In conclusion, conductivity denotes the ability of a material to allow heat and electricity to pass through it.
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Write the symbol for the ion depicted here
Answer:
can you repost with picture? I can help.
A piece of chalk (mainly calcium carbonate) is placed in 250. mL of 0.468 M HCI.
All the CaCO3 reacts, releasing carbon dioxide gas and leaving 250. mL of a clear solution.
20.00 mL of the solution is pipetted into another flask.
29.8 mL of 0.0576 M NaOH is required to titrate the HCI remaining in this 20.00-mL portion.
What was the original mass of CaCO3 in the piece of chalk
To calculate mass of CaCO3, individual mass of the elements is taken (Ca= 40.1g/mol, C= 12.0g/mol, O=16.0g/mol). So, 40.1+12.0+48.0 = 100.1gmol. Therefore, 100.1 g/mol is the answer.
What is calcium carbonate?Calcium carbonate is a source of calcium in the supplemental form. It is also present as a part of exoskeleton in certain animals. It is also found as a component in eggshells.
It is obtained from carbon resources. Calcium carbonate is industrially used in production of limescale and in plaster of paris for roofing. It is often used to treat hyperacidity and given as an antacid.
Thus, calcium carbonate has wide range of chemical applications.
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PLEASE HELP
What is the frequency of a photon whose energy (E) is 7.48 x 10 -6 J?
Answer:
1.128*10¹⁹ [GHz].
Explanation:
1) the initial formula is
E=hν, where ν - required frequency,
2) according to the formula above
[tex]\nu=\frac{E}{h};\\ \nu=\frac{748*10^{-8}}{663*10^{-36}}=1.128*10^{28}[Hz][/tex]
How would you prepare 1.00 L of a 0.50 M solution of each of the following?
NiCl2 from the salt NiCl2. 6H2O
1. To prepare 0.5 M NiCl₂ solution, dissolve 64.8 g of NiCl₂ in 1 L of water
2. To prepare 0.5 M NiCl₂.6H₂O solution, dissolve 118.8 g of NiCl₂.6H₂O in 1 L of water
How to prepare solution1. How to prepare 0.5 M NiCl₂ solution
We'll begin by obtaining the mole of NiCl₂. This can be obatined as follow:
Volume = 1 LMolarity = 0.5 MMole of NiCl₂ =?Mole = Molarity x Volume
Mole of NiCl₂ = 0.5 × 1
Mole of NiCl₂ = 0.5 mole
Finally, can obtain the mass of NiCl₂ needed to prepare the solution as follow:
Mole of NiCl₂ = 0.5 moleMolar mass of NiCl₂ = 129.6 g/molMass of NiCl₂ =?Mass = mole × molar mass
Mass of NiCl₂ = 0.5 × 129.6
Mass of NiCl₂ = 64.8 g
Thus, to prepare 0.5 M NiCl₂, dissolve 64.8 g of NiCl₂ in 1 L of water
2. How to prepare 0.5 M NiCl₂.6H₂O solution
We'll begin by obtaining the mole of NiCl₂.6H₂O This can be obatined as follow:
Volume = 1 LMolarity = 0.5 MMole of NiCl₂.6H₂O =?Mole = Molarity x Volume
Mole of NiCl₂.6H₂O = 0.5 × 1
Mole of NiCl₂.6H₂O = 0.5 mole
Finally, can obtain the mass of NiCl₂.6H₂O needed to prepare the solution as follow:
Mole of NiCl₂.6H₂O = 0.5 moleMolar mass of NiCl₂.6H₂O = 237.6 g/molMass of NiCl₂.6H₂O =?Mass = mole × molar mass
Mass of NiCl₂ = 0.5 × 237.6
Mass of NiCl₂.6H₂O = 118.8 g
Thus, to prepare 0.5 M NiCl₂.6H₂O dissolve 118.8 g of NiCl₂.6H₂O in 1 L of water
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Be sure to answer all parts.
Which monatomic ions would you expect rubidium (Z = 37) and phosphorus (Z = 15) to form?
rubidium (Z = 37)
phosphorus (Z = 15)
Answer:
Explanation:
z=36
f=88
c=66
Where should Franklin place this property in his table?
Answer:
to the left of his table :)
An exothermic reaction is a
reaction that produces heat.
Which would describe this
type of reaction?
A. A physical change
B. A chemical change
C. A solution change
An exothermic reaction is a reaction that produces heat this type of reaction is a chemical change.
The correct option is B.
What is an Exothermic Reaction?Exothermic reactions are chemical in nature and are distinguished by the release of energy in the form of heat or light. One instance of this kind of reaction, when the release is in the form of both heat and light, is lighting a match. An exothermic reaction causes the release of heat, which raises the temperature of the surrounding area. An exothermic process process that absorbs heat cools the environment.
What four exothermic reactions are examples?Polymerizations, combustion, thermite reactions, mixing potent acids and bases As an everyday example, hand warmers exploit the exothermic reaction brought on by iron oxidation.
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Why are nutrient molecules important?
Nutrient molecules are important because the body breaks down nutrient molecules into absorbable molecules that can produce energy in the body for carrying out daily tasks.
In order to sustain life and promote growth and health, our bodies need nutrients that are chemical components that can be found in food. Nutrients must come from our diet because the human body is unable to produce them.Three primary roles that nutrients play in the body include: supplying energy, supporting bodily structure, and controlling chemical reactions.Our body needs a variety of nutrients, including carbohydrates, protein, fat, minerals, vitamins, roughage, etc.Macronutrients are nutrients that must be present in large quantities. The three types of macronutrients are proteins, lipids, and carbohydrates. These might be metabolically converted into cellular energy.The body needs micronutrients in smaller levels, yet they are still necessary for performing basic activities. All of the necessary minerals and vitamins are considered micronutrients.Therefore, nutrient molecules are important for overall growth of our body.
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Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Zn2+, Al3+, Br−, S2−
The required empirical formula
Zn2+ ---> ZnBr2Al3+ --->ZnSBr− ---->AlBr3S2− ----> Al2S3This is further explained below.
What is the empirical formula?Generally, The empirical formula of a chemical compound is the most straightforward representation of the atom counts in the molecule as whole numbers.
As a straightforward illustration of this idea, consider the empirical formula of sulfur monoxide, which is denoted by the symbol SO, and compare it to the empirical formula of disulfur dioxide, which is denoted by the symbol S2O2.
Zn2+ ---> ZnBr2Al3+ --->ZnSBr− ---->AlBr3S2− ----> Al2S3Read more about the empirical formula
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If the mass of a crucible is 12.1 g and the mass of a crucible containing CuSO4 is 23.1 g, then what is the mass of the CuSO4?
If the mass of a crucible is 12.1 g and the mass of a crucible containing CuSO4 is 23.1 g, then the mass of the CuSO4 is 11 gram.
A basic characteristic of all matter, inertia can be quantified as mass. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application of a force. we know the mass of crucible and mass of crucible containing copper sulphate so to find out the mass of copper sulphate we will subtract mass of crucible from mass of crucible containing copper sulphate.Given,
mass of crucible is 12g
mass of crucible with copper sulphate is 23.1g
so the mass of CuSO4 = mass of crucible with copper sulphate - mass of crucible
= 23.1 g - 12.1g = 11 g
Therefore mass of CuSO4 is 11g
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When an electron moved from ground state to the excited state it
When an electron moved from the ground state to the excited state it gained energy and passed to a high level of energy.
What is an electron shell?An electron shell is a layer of the electrons that contains a given amount of energy and may pass to higher levels by excitation which also read to change the orbital from the ground state to the excited state.
In conclusion, when an electron moved from the ground state to the excited state it gained energy and passed to a high level of energy.
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what is the total length of two pieces of tubing which measure 4.5 cm and 3.222 cm? express the answer to the correct number of significant figures
The total length of the two pieces of tubing with correct number of significant figures is 7.7 cm.
There are certain rules regarding significant figures.
The rule about the addition of two quantities is that when two quantities are added then the number of digits after decimal in the sum of the two quantities should be equal to the least number of decimal places present in the given quantities.
In the above case, the two numbers are 4.5 cm and 3.222 cm and they contain 1 and 3 digits after decimal. So, the final answer should have only 1 decimal place.
Adding 4.5 cm + 3.222 cm = 7.722 cm
The answer should contain only 1 digit after decimal so the answer is rounded off to 7.7 cm.
Thus, the total length of the two pieces of tubing with correct number of significant figures is 7.7 cm.
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Consider the reaction, 2 C3H8O(g) + 9 O2(g) → 6 CO2(g) + 8 H2O(g).
a. When 12 mol O2(g) react, how many moles of CO2(g) form?
When 12 moles of O₂ (g) react with C₃H₈O (g) then 8 moles of CO₂ (g) is produced. This is the chemical combustion reaction of propanol producing vapor of CO₂.
How to calculate the amount of CO₂ produced?Alcohols undergo combustion reaction in the presence of oxygen gas to produce vapor of CO₂ and water.
In the given equation,
2 C₃H₈O (g) + 9 O₂ (g) → 6 CO₂ (g) + 8 H₂O (g)
To calculate the number of moles of CO₂ produced, first we have to balance the equation:
Divide the equation by 2
C₃H₈O (g) + 9/2 O₂ (g) → 3 CO₂ (g) + 4 H₂O (g)
Calculate the number of moles of CO₂ (g) produced with 1 mol of O₂ (g)
9/2 O₂ (g) → 3 CO₂ (g)
1 O₂ (g) → 3÷9/2 CO₂ (g) = 0.66 mol CO₂ (g)
For 12 mol of O₂ (g),
12 × 0.66 = 8 mol CO₂ (g)
Therefore, 8 mol of CO₂ (g) is produced from 12 mol of O₂ (g).
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Which of the following statements is TRUE about graphic scores?
A. Graphic scores can only be written on manuscript paper
B. The performer can interpret the score however he/she wishes
C. Graphic scores cannot show dynamic changes
D. The composer is not allowed to make suggestions regarding the performance
The performer can interpret the score however he/she wishes in a graphic score. The correct option is B.
What is graphic score?A graphic score is simply another method of notating music or sounds on a page, in addition to the more traditional 5-line stave.
They created graphic scores or graphic notation, a new way of visualizing music. Graphic scores are frequently distinct from traditional musical scores.
Graphic scores, as opposed to lines and dots on a musical stave, can use a variety of images and symbols to instruct the performer on what to play.
In a graphic score, the performer can interpret the score however he or she sees fit.
Thus, the correct option is B.
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