Students are investigating the relationship between pressure and temperature in gases. They have blown up a balloon with carbon dioxide from an air tank and connected the balloon to a pressure gauge. The balloon is then submerged in ice or water baths at various temperatures in order to observe the pressure level after several minutes. What is the flaw in the student’s investigation, and how can the students improve their investigation to correctly determine the relationship?
A.
The volume and density of the air in the balloon can change, therefore they need to use several different balloons at different volumes to account for how density and volume affects pressure.
B.
The volume of the balloon can change, therefore they need to use several different balloons at different volumes to account for how volume affects pressure.
C.
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.
D.
To keep the volume of the balloon from changing, so they can focus on temperature and pressure they need to use a container that does not expand like a balloon. A constainer made of plastic or metal to hold the air.
Answer:
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.
Explanation:
1. All the individuals of one type of clownfish ( e. species) living in a reef compose which level of organization?
314.5g HBr (MMHBr = 80.91g/mol), is mixed into 4.50L solution. Find Molarity (M) of the
solution.
Answer:
[tex]\boxed {\boxed {\sf M \approx0.864 \ M \ HBr}}[/tex]
Explanation:
The molarity of a solution is the moles per liter. It is found using this formula:
[tex]M=\frac { moles \ of \ solute}{liters \ of \ solution}[/tex]
First we must calculate moles, since we are given grams. To convert from grams to moles, the molar mass is used. This is also given to us, it is 80.91 grams per mole. We can use it as a ratio.
[tex]\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]
Multiply by the given number of grams.
[tex]314.5 \ g \ HBr *\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]
Flip the fraction so the grams of HBr cancel.
[tex]314.5 \ g \ HBr *\frac {1 \ mol \ HBr}{80.91 \ g \ HBr}[/tex]
[tex]\frac {314.5 \ mol \ HBr}{80.91 }=3.88703497714 \ mol \ HBr[/tex]
Now we know the moles, and can calculate the molarity.
There are 3.88703497714 moles of solute and 4.50 Liters of solution.
[tex]M= \frac {3.88703497714 \ mol }{ 4.50 \ L}[/tex]
[tex]M= 0.863785550476 \ mol/ L[/tex]
The original measurements have 4 and 3 significant figures, so we use the lowest number of 3 for our answer. For the number we calculated, that is the thousandth place.
The 7 in the ten thousandth place tells us to round the 3 to a 4.
[tex]M \approx 0.864 \ mol/ L[/tex]
[tex]M \approx 0.864 \ M \ HBr[/tex]
The molarity of the solution is about 0.864 M HBr.
what is the ratio of aluminum chloride to lithium sulfate
During reaction between calcium and oxygen valence electrons
A. are transferred from atoms of calcium to atoms of oxygen to form Ca+ and O- ions
B. are shared between atoms of calcium and atoms of oxygen
C are transferred from atoms of calcium to atoms of oxygen to form Ca+2 and O-2 ions
D. are transferred from atoms of oxygen to atoms of calcium to form Ca- and O+ ions
Answer:
C are transferred from atoms of calcium to atoms of oxygen to form Ca+2 and O-2 ion
Explanation:
Calcium is a meta and Oxygen is a non metal. The bond that forms between a metal and a non metal is an ionic bond. In an ionic bond, the metal loses electrons while the non metal gains the electrons; hence there is transfer of electrons.
Calcium belongs to group 2 and oxygen needs 2 more electrons to complete it's electronic configuration.
Calcium would lose two electrons to form Ca+2 and oxygen would gain two electrons to form O-2 ion
The correct option is;
C. are transferred from atoms of calcium to atoms of oxygen to form Ca+2 and O-2 ion
calcium + zinc nitrate ------->
a) zinc + calcium chloride
b) there will be no reaction
c) zinc + calcium nitrate
d) calcium + zinc nitrate
Answer:
c
Explanation:
there will be displacement reaction taking place
Answer:
there will be no reaction
Explanation:
there will be no reaction since calcium does not displace zinc
in the following acid-base reaction, h20 is the____ hci(g)+h2o(I) = h3o+(aq)+ci-(aq)
Answer:
B: Base
Explanation:
Correct
In acid-base reaction, h20 is the Base.
The reaction HCl(aq) + H2O(l) H3O+(aq) + Cl(aq) - HCl gives water a proton. HCl is an acid as a result. A proton is taken up by H2O from HCl. H2O is a base as a result.
Acid–base reactionIn most acid-base reactions, there will always be water and salts. For example, hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to form sodium chloride (NaCl) salt and water (H2O).What are bases and acids?Any hydrogen-containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.Learn more about Acid–base reaction brainly.com/question/15209937
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What is the lanthanide with least mass, periodic table?
Answer:
Europium/Eu ( not really sure )
The lanthanide element with the least mass is Lutetium (Lu)
Lutetium (Lu) is a member of the lanthanide series, which is a group of 15 elements located in the f-block of the periodic table. The lanthanide series starts with the element Lanthanum (La) and ends with Lutetium (Lu). Lutetium is the heaviest and most dense element in the lanthanide series. Lutetium has an atomic number of 71, indicating that it has 71 protons in its nucleus. It has a relatively high atomic mass of approximately 174.97 atomic mass units (u) according to the periodic table.
Hence, lutetium is the lanthanide element with the least mass.
Learn more about lanthanide elements here:
https://brainly.com/question/28305751
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As current flows through a system, what happens to the voltage available at each load?
Answer: voltage drops in each resistor ΔU= RI
Explanation: if lamps or other resistor which cause load are in series in
Electric circuit, current I passing circuit is same. Voltage decreases
In every resistor
complete the bolded items in each box below
Show the bolded items and the boxes.
Which of the following elements is the most reactive?
A. Ba
B. Cs
C. Hf
D. Lu
Answer: Cs because its further to the right on the table, meaning its more reactive.
Explanation:
Answer:
Cs
Explanation:
This element is the farthest right, and lowest meaning that its reactivity is very high.
1. valence electrons and electronegativity
2. Both reactivity and electronegativity decrease down a group.
3. Electronegativity decreases down a group and reactivity increases down a group.
4. The number of valence electrons increases from left to right.
5. Cs
{quizlet: captncrun}
A scientists who studies how water moves around is called......
Answer:
A scientists who studies how water moves around is called "Hydrologist".
what is the effect of light on valence electrons?
Answer:
When a small amount of external energy in the form of light is applied to the conductor, the valence electrons gain enough energy from the light to break the bonding with the atom and they jumps into the conduction band.
The effect of light on valence bis absent negative charges in the valence band, correspond to electrons elevated to the conduction band. When the semiconductor is lit, current flow is increased by both electrons and holes.
Why are valence electrons important?The outermost or valence shell electrons, known as valence electrons, are crucial because they shed light on an element's chemical characteristics and are the ones that are acquired, lost, or shared during a chemical reaction.
In general, when an atom's outermost electron shell is full, it is at its most stable and least reactive.
Thus, The valence electrons get enough energy from the light to break their link with the atom and move into the conduction band when a modest amount of external energy in the form of light is delivered to the conductor.
To learn more about the valence electron, follow the link;
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A force of 25 newtons is exerted over an area of 50 square meters. Calculate
the pressure exerted in pascals.
Answer:
the pressure exerted in pascals is 0.5 Pa
Explanation:
The computation of the pressure exerted in pascals is shown below:
As we know that
Pressure = force ÷ area
= 25 ÷ 50
= 0.5 Pa
Hence, the pressure exerted in pascals is 0.5 Pa
We simply applied the above formula so that the correct pressure could come
In a chemical reaction between copper metal and silver nitrate, 12.7 g of copper(II) and 64.5 g of silver nitrate react, and 38.1 g of Silver is produced. 21) Predict the products and write the balanced equation and include the physical state of each. 22) What type of chemical reaction is this? 23) Which is the limiting reactant? You must include the work for this to receive full credit. 24) What mass of excess is used up, and what mass is left over? 25) Calculate the percent yield.
Answer:What should you do if you realize during research that your original theory is wrong
Explanation:
In what way is heat transferred to the tubes? (Hint “touching’”)
Please help
I will give you Brainliest
Answer:
in heat transfer, as the fluid flows along the tube, the wall layers are heated or cooled. temp. variation occurs in the wall layers.
good luck :)
i hope this helps
have a great day !!
How many molecules of CrCl₃ are produced when 2.89 moles of CuCl₂ react? *
2Cr+3CuCI2-2CrCI3+3Cu
Explanation:
The reaction is CaCO
3
+2HCl→CaCl
2
+H
2
O+CO
2
.
Thus, 2 moles of HCl reacts with one mole of calcium carbonate to produce one mole each of calcium chloride, water and carbon dioxide respectively.
Hence, 3 moles of HCl will react with excess of calcium carbonate to produce 3×
2
1
=1.5 mol of carbon dioxide
- A compound contains 4.56g. of Pb, 2.3g Cl, and 3.1g 0. What is the percent
composition for each element?
please show work
Why does nobody fking answer my questions.
How did stromatolites contribute oxygen to the early atmosphere?
through methane degradation
through photolysis
by weathering of rocks
through photosynthesis
Answer:
by wearing of rocks
Explanation:
earths gravity your welcome
Answer:
weathering of rocks is the answer to your question
Question 7 of 10
The Sun has a diameter of about 865,000 miles.
Suppose you were making a scale model of the
solar system with a scale of 1 inch:1,000 miles.
How wide would the Sun be in your model?
A. 865,000 inches
B. 865 inches
C. 86.5 inches
O D. 8.65 inches
Answer:
you have to decide 865,000 with 1000 and the answer is 865
What kind of reaction is 2H202 → 2H20 + O2?
O A. Decomposition
O B. Single-replacement
C. Double-replacement
O D. Synthesis
Answer:
this reaction is so the answer should be A
When Acid Rain falls on limestone, the rock is eroded and carbon dioxide is produced.
Write a balanced equation for the reaction between calcium carbonate and nitric acid.
The formula of calcium carbonate is CaCO3
The formula of nitric acid is HNO3.
When put together:
CaCO3 + HNO3 = Ca(NO3)2 + CO2 + H2O
The balanced equation:
CaCO3 + 2HNO3 = Ca(NO3)2 + CO2 + H2O
What causes the periodic (recurring)
patterns seen in the periodic table?
In general, the Hippocratic Oath requires physicians to do all of the following EXCEPT which action?
treat every ill patient
do no harm
help their patients as best they can
maintain the privacy of their patients
Answer:
Physicians do not have to treat every ill patient. However they must uphold their ethics (eg. do no harm, confidentiatlity, etc.).
Explanation:
Primary source:
Hippocratic Oath (translation since it's originally in Greek)
I swear by Apollo the physician, and Asclepius, and Hygieia and Panacea and all the gods and goddesses as my witnesses, that, according to my ability and judgement, I will keep this Oath and this contract:
To hold him who taught me this art equally dear to me as my parents, to be a partner in life with him, and to fulfill his needs when required; to look upon his offspring as equals to my own siblings, and to teach them this art, if they shall wish to learn it, without fee or contract; and that by the set rules, lectures, and every other mode of instruction, I will impart a knowledge of the art to my own sons, and those of my teachers, and to students bound by this contract and having sworn this Oath to the law of medicine, but to no others.
I will use those dietary regimens which will benefit my patients according to my greatest ability and judgement, and I will do no harm or injustice to them.
I will not give a lethal drug to anyone if I am asked, nor will I advise such a plan; and similarly I will not give a woman a pessary to cause an abortion.
In purity and according to divine law will I carry out my life and my art.
I will not use the knife, even upon those suffering from stones, but I will leave this to those who are trained in this craft.
Into whatever homes I go, I will enter them for the benefit of the sick, avoiding any voluntary act of impropriety or corruption, including the seduction of women or men, whether they are free men or slaves.
Whatever I see or hear in the lives of my patients, whether in connection with my professional practice or not, which ought not to be spoken of outside, I will keep secret, as considering all such things to be private.
So long as I maintain this Oath faithfully and without corruption, may it be granted to me to partake of life fully and the practice of my art, gaining the respect of all men for all time. However, should I transgress this Oath and violate it, may the opposite be my fate.
1. The chemical formula of caffeine is C8H10N4O2. Determine the percent composition of the molecule.
Show work please
Answer:
we find the mass for each element in one mole by multiplying the number of atoms in one molecule with the atomic mass
mC=8Ac=8*12=96g
mH=10AH=10*1=10g
mN=4AN=4*14=56g
mO=2AO=2*16=32g
by adding the masses together we find the molar mass of the molecule
M=mC+nH+mN+mO=96+10+56+32=194g/mole
we apply the rule of threes to find the percentage of each element
194g..96gC..10gH...56gN....32gO
100g....a...........b...........c.............d
a=(100*96)/194=49.48%C
b=(100*10)/194=5.19%H
c=(100*56)/194=28.85%N
d=(100*32)/194=16.48%O
Explanation:
PLSS helppp
i know how to report btw
Answer:
first one
Explanation:
What is the highest level of organization for living and nonliving things?
Community
Ecosystem
Family
Population
✨And give a explanation ✨
In the electrolysis of molten lead bromide, what is the product at the anode?
Answer:
it is the second one. Lead
explain why a total lunar eclipse appears red.
I
Answer:
During a total lunar eclipse, the Earth lies directly between the sun and the moon, causing the Earth to cast its shadow on the moon.
Explanation:
how should baking pizza be categorized
Answer: The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy
Explanation:
Answer:
endothermic; the dough absorbs heat
Explanation:
EDG2020