Answer:
formula of concentration ion.
What temperature scale is used in gas law calculations.
Answer: You used the Kelvin scale.
Explanation: this is because its multiplied by the temperature im not sure.
what could have caused the change in the rock layers.
Answer: Changes in the environment
Explanation: the rocks are subjected to extreme heat and pressure, volcanic activities or movements on the Earth's surface.
Hydrogen peroxide and potassium permanganate balanced equation
Answer:
2 KMnO4 + H2O2 → 2 MnO2 + 2 O2 + 2 KOH - Balanced equation
Make a prediction about what will happen in this chemical reaction.
1. Add about 5 mL of Copper (II) sulfate solution into a small beaker.
2. Add a small bundle of steel wool (iron).
3. Leave to sit while you complete the rest of your reactions, but be sure to keep an
eye on this one throughout the lab.
Since iron is more reactive than copper, when steel wopl is placed in a solution of copper (II) sulfate solution into a small beaker, it dissolves and copper metal is produced.
What is a displacement reaction?A displacement reaction is one in which a more reactive element displaces another from its compound.
Reactive metals displace less reactive metals from their solutions.
Iron is a more reactive metal than copper and will displace copper from a solution of its salt.
Therefore, when steel wool is placed in a solution of copper (II) sulfate solution into a small beaker, the iron dissolves and copper metal is produced.
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Select all the correct answers.
What do scientists use to communicate extremely small measurements?
unit prefixes
A. base units
B. physical models
C. graduated cylinders
D. scientific notation
D
This is when very large or very small numbers must be written. They come in the format or 5.43 x 10^3 or can be written as 8.26E6. The numbers will vary depending on your number.
Which statement best describes the use of a chemical indicator in a titration? It must be measured to the nearest 0. 01 mL. It must be colored in the acid solution. It must measure pH directly at all pH values. It must change color near the equivalence point.
The statement that best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.
What are indicators?Indicators are those compounds which are used in the titration process to estimate the presence of chemical entities in it.
In the titration process, indicator is added in the titration solution which changes its color when the reaction mixture goes towards the equivalence point and becomes disappear at that point.
Hence option (4) is correct.
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What types of R groups can exist in amino acids? (Choose all that apply)
Acidic
Non-polar
Basic
Polar
Answer:
acidic,non polar,basic
Explanation:
that’s the ones I put and I got a 100% on my test just now
The types of R groups that can exist in amino acids include acidic, non-polar, basic, and polar groups.
1. Acidic R groups: These groups have a negative charge and can donate a proton (H+). An example of an amino acid with an acidic R group is aspartic acid (Asp) or glutamic acid (Glu).
2. Non-polar R groups: These groups are hydrophobic and do not have a charge. They are composed mainly of carbon and hydrogen atoms. Examples of amino acids with non-polar R groups include alanine (Ala), valine (Val), and phenylalanine (Phe).
3. Basic R groups: These groups have a positive charge and can accept a proton. An example of an amino acid with a basic R group is lysine (Lys) or arginine (Arg).
4. Polar R groups: These groups are hydrophilic and have a partial charge. They can form hydrogen bonds with other polar molecules. Examples of amino acids with polar R groups include serine (Ser), threonine (Thr), and asparagine (Asn).
Thus, types of R groups that can exist in amino acids include acidic, non-polar, basic, and polar groups.
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What enables humans to "see" light in the infrared range of the electromagnetic spectrum?
RF technology
UV converter
microwave sensor
night-vision goggles
Night vision Goggle's help human to see light in the infrared range of the electromagnetic spectrum.
What is Night vision Goggle's?Night-vision device Goggle is an optical device that is use to view images and allows images to be produced or refracted at different levels of lnfrared light approaching from electromagnetic spectrum.
Therefore, Night vision Goggle's help human to see light in the infrared range of the electromagnetic spectrum
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Which of these describes an ethical dilemma that drug designers could face?
a. whether people should take medicine or if instead they should
seek alternative treatments.
b. a drug lowers blood pressure but can cause severe coughing
spells.
c. a new drug is effective in preventing cancer cells from
reproducing
o d. a drug for blood pressure is absorbed in the colon. it is effective,
but occasionally it can erode the colon walls.
The statement 'whether people should take medicine or if they should seek alternative treatments' describes an ethical dilemma that drug designers face.
What is drug development?Drug development refers to all the processes from target drug identification to drug validation and commercialization.
Drug development involves different stages of development including preclinical and clinical trials.
Ethical dilemmas in drug development include the release of a drug that is ineffective when compared to parallel treatments.
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Answer:
A drug for blood pressure is absorbed in the colon. It is effective, but occasionally it can erode the colon walls.
Explanation:
i just took the test and got it right.... i hope this helps :)
if 146.5 g of chromium(lll) chlorate decomposes, what mass of oxygen can be produced?
Answer:
The Equation for this reaction is as follow,
2 Cr(ClO₃)₃ → 2 CrCl₃ + 9 O₂
According to eq,
604.68 g (2mole) of Cr(ClO₃)₃ produces = 288 g (9 moles) of O₂
So,
146.5 g of Cr(ClO₃)₃ will produce = X g of O₂
Solving for X,
X = (146.5 g × 288 g) ÷ 604.68 g
X = 69.77 g of O₂
How is an element called if the number of neutrons exceed the number of protons?.
Answer:
In a heavier nucleus, the repulsive force between the protons is very high. For stability, the nuclear force must dominate this electrostatic repulsive force. This is possible if the number of neutrons is greater than number of protons.
help ty! I just need help with the third one
Answer:
D
Explanation:
because if a flea is on a dog that is a parisite to host relashionship
Answer:
for number 3 is D
Explanation:
but i am not 100% sure of that
What is ∆H for the reaction of sulfur dioxide with oxygen?
2SO2(g) + O2(g) → 2SO3(g)
(∆Hf0 SO2(g) = –296.8 kJ/mol; ∆Hf0 SO3(g) = –395.7 kJ/mol)
A.)–98.9 kJ
B.)–197.8 kJ
C.)1.385 × 103 kJ
D.)197.8 kJ
Answer:
B.) –197.8 kJ
Balanced equation : 2SO₂(g) + O₂(g) → 2SO₃(g)
Given:
SO₂(g) = –296.8 kJ/molSO₃(g) = –395.7 kJ/mol================================================================
products : 2 ( –296.8 ) + O₂ = -593.6 kJ/mol + O₂reactant : 2 ( –395.7 ) = -791.4 kJ/molproducts energy = reactant energy
-593.6 + O₂ = -791.4
O₂ = -791.4 - ( -593.6)
O₂ = –197.8 kJ
During Taylor's second test of a car with a mass of 200 grams, she recorded 11 seconds, 11.4 seconds, and 11.2 seconds for her 3 trials. What would be the mean value she would use to compare with the other cars?
11 seconds
33.6 seconds
11.2 seconds
11.53 seconds
Answer:
the answer is 11.2 seconds. I listened to the other person and picked 33.6 but that was wrong.
Explanation:
took test
Which of the following are duplicated during cell division in a human cell?.
All cell constituents are duplicated during cell division in a human cell i.e. mitosis and meiosis type of cell division.
What are duplicated during cell division in a human cell?During mitosis, a cell duplicates all of its internal parts and formed two identical daughter cells. During duplication, all parts have two sets which is equally distributed into two daughter cells in mitosis type of cell division.
While on the other hand, during meiosis, a cell divides into four daughter cells having haploid chromosomes i.e. half number of chromosomes.
So we can conclude that cell constituents are are duplicated during cell division in a human cell.
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The percentage of keys you type correctly is A. accuracy B. correctness C. exactness D. precision WHO EVER GETS THIS EARNS BRAINLIST!
A chemist is studying a chemical compound that
has equal numbers of carbon atoms and hydrogen atoms. She calculates that the
carbon atoms have a mass of 24 grams. What is the mass of the hydrogen atoms?
Explain your reasoning.
The mass of hydrogen atoms in the compound would be 2 grams.
Stoichiometric calculationThe carbon atoms in the compound have a mass of 24 grams.
One carbon atom has a mass of 12 grams. Thus, there are two (12 x 2 = 24) carbon atoms in the compound.
This means that there are also two hydrogen atoms in the compound. One hydrogen atom weighs 1 gram. Hence, the mass of the hydrogen atoms in the compound will be 2 grams.
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A solute is added to water and a portion of the solute remains undissolved. When equilibrium between the dissolved
Answer:
are you to measures how much solute dissolved with the water or trying to measure how much more water you need the solute to dissolve in ?
The solute is a component of the solution that is added to a solvent to make a solution. when equilibrium is attained then the solution will be saturated.
What is a saturated solution?A saturated solution is a solution that contains the maximum amount of dissolved solute particles in it and cannot further dissolve solutes added additionally.
When the solute is added and does not get dissolved then the equilibrium between dissolved and undissolved is reached and the solution becomes saturated.
Therefore, the solution is saturated.
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Sample data from titration lab:
Amount of analyte; (HCI): 19.54 mL
Amount of titrant: (NaOH): 12.33mL
Molar concentration of NaOH: 0.5 mol
The molarity of the HCl would be:
VM
The numbers I used are probably wrong
Based on the volumes of HCl and NaOH reacted, the molarity of HCl is 0.3 M
What a titration?A titration is a process in volumetric analysis in which the given volume of a substance of known concentration reacting with a volume another solution of unknown concentration is used to determine the unknown concentration of another solution
In the titration given, an unknown concentration of HCl reacts with 0.5 M NaOH solution.
The equation of the reaction is given below:
HCl + NaOH -----> NaCl + H2OAt equivalence point, 1 mole of HCl reacts with 1 moles of NaOH
moles of NaOH = 12.33 × 0.5 = 6.165 moles
moles of HCl = 19.54 × M
From above, moles of HCl = 6.165 moles
Molarity of HCl, M = 6.165/19.54
Molarity of HCl = 0.3 M
Therefore, the molarity of HCl is 0.3 M
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Answer:
0.317
Explanation:
right on edge
Does electronegativity affect replacement reactions
Elecetronegativity will affect the replacement reactions as it attracts the bonded electrons towards itself.
What is replacement reaction?Replacement reactions are those reactions in which replacement of any one element from any compound is done by any other element.
Electronegativity is the attracting power of any element to hold the bonded electron towards itself so that they will bear a partial negative charge on itself. If in any reaction replacement of anion is required and any compound have more electronegative element which bounded the bonded electron strictly and will not allow the formation of anion then it affects the activity of the reaction.
Hence electronegativity affect the replacement reactions.
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which elements are not likely to bond with other elements? and why
Answer:
Helium, Neon, Argon, Krypton, Xenon, Radon, and Oganesson
Explanation:
they have full outer shells
Justify why sound cannot travel through space.
Answer:
Sound does not travel at all in space. The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound.
rate brainliest!
Review the map that shows earthquake zones as yellow lines and active volcanoes as red dots. what pattern can you determine about the focation of the volcanoes and the earthquake zones? also explain why the earthquake zones are long lines on the globe. write 3 to 5 sentences.
A map that shows the location of volcanoes is called a Geologic Map. This kind of map contains information about the geological history and condition of volcanic sites.
What do Geologic Maps indicate?
Geologic maps indicate the following:
Note that the map specific to the question is unavailable hence the general response.
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what is the best "determiner" for identifying if it is a metal?
I need the answer please
Answer:
determiner is a word that introduces a noun or provides information about the quantity of a noun.
Explanation:
The metal cans are recyclable. (determiner before the adjective describing a plural noun to specify which cans)
Metal cans are recyclable. (no determiner because it's optional for plural nouns and noun phrases)
Please help with this question
Answer these questions based on 234. 04360 as the atomic mass of thorium-234. The masses for the subatomic particles are given. Round the mass defect to the 5th decimal place. Mass of a proton: 1. 00728 amu mass of a neutron: 1. 00866 amu How many protons does Thorium have? How many neutrons does Thorium-234 have? Calculate the mass defect for the isotope thorium-234 = amu.
The mass defect for the isotope thorium-234 if given mass is 234.04360 amu is 1.85864 amu.
How do we calculate atomic mass?Atomic mass (A) of any atom will be calculated as:
A = mass of protons + mass of neutrons
In the Thorium-234:
Number of protons = 90
Number of neutrons = 144
Mass of one proton = 1.00728 amu
Mass of one neutron = 1.00866 amu
Mass of thorium-234 = 90(1.00728) + 144(1.00866)
Mass of thorium-234 = 90.6552 + 145.24704 = 235.90224 amu
Given mass of thorium-234 = 234.04360 amu
Mass defect = 235.90224 - 234.04360 = 1.85864 amu
Hence required value is 1.85864 amu.
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A footprint of a Tyrannosaurus rex has been found in New Mexico. What type of fossil is this
imprint?
Cast?
Tar seep?
Answer:CAST!!!!!!!!!!!!!!!
Explanation:
Devise a three‑step synthesis of the product from 1‑methylcyclohexene
The three step synthesis of the product from 1-methyl cyclohexane includes the addition of;
C6H5CO3H in CH2Cl2C6H5Li in etherPCC in CH2Cl2.Three step synthesis from 1 methyl cyclohexeneThe three steps reaction involves the use of Reagannts such as;
Reagent 1: C6H5CO3H in CH2Cl2.Reagent 2: C6H5Li in ether.Reagent 3: PCC in CH2Cl2.Each step in the synthesis is arranged in the order:
Step 1: Epoxide formationStep 2: Nucleophilic additionStep 3: Oxidation of OH group.Read more on three step synthesis;
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Three step synthesis of the product from 1‑methylcyclohexene includes epoxide formation, nucleophilic attack and oxidation of -OH group.
What is synthesis reaction?Synthesis reactions are those reactions in which formation of new product takes place by the rearrangement or combination of reactant molecules.
Given question is incomplete so the complete pic of the question is attached below. In the given reaction reagents 1, 2 and 3 are used is C₆H₅CO₃H in CH₂Cl₂, C₆H₅Li in ether and PCC in CH₂Cl₂ respectively.
In the tree step synthesis process, in the first step formation of epoxide takes place, in the second step attack of nucleophile on epoxide takes place and finally in the third step oxidation of hydroxyl group to ketone group takes plce.
Hence 3 step synthesis includes epoxide formation, nucleophilic attack and oxidation of -OH group.
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The equation for the burning of hydrogen is:
2H2(g) + O2(g) → 2H2O(g)
One mole of hydrogen gas is mixed with one mole of oxygen gas and burnt. What will
be present after the reaction?
Hurrrryyyyy pls
Based on the experiment below, what was the dependent variable?
Bean
Soil
Bean
Soil
Bean
Soil
Height 20.4 cm
Mass: 159
Height: 45.7 cm
Mass: 6.19
Height: 46.5 cm
Mass: 6.69
LI
Daily water 10 mL
A Daily water 50 mL
B
Daily water 100 mL
С
Answer:
The growth of the plant
Explanation:
The growth of the plant from the bean soil is the dependent variable I believe. This is because it could change depending on many factors for e.g. the amount of light or water