Answer:
Starch reacts with Iodine in the presence of Iodide ion to form an intensely colored blue complex, which is visible at very low concentrations of Iodine, making it a very good indicator in both direct and indirect lodometric titrations.
Explanation:
hope this helps
what is the molecular geometry of AsCl3?
Molecules' general shape, as well as bond lengths, bond angles, torsional angles, and any other geometrical factors that affect each atom's position, are revealed by their molecular geometry. The molecular geometry of AsCl₃ is trigonal pyramidal.
Molecule geometry is the study of the three-dimensional configuration of the atoms that make up a molecule. Because the shared pairs of electrons remain localized in a specific location between the nuclei of the involved atoms, covalent molecules have directed bonds.
The arsenic atom is surrounded by 4 regions of electron density which means that it has a steric number equal to 4. According to VSPER Theory, the molecular geometry will be trigonal pyramidal, AX₃E₁.
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13. Which has the largest atomic radius?
A. fluorine B. chlorine C. bromine
D. a bromine anion with a charge of 1-
Answer:
bromine
Explanation:
Which list correctly compares how adding energy affects a substance during a phase change and not during a phase change?(1 point)
during a phase change: particles overcome forces of attraction and temperature stays the same
not during a phase change: particles become closer together
during a phase change: particles overcome forces of attraction and temperature stays the same
not during a phase change: temperature rises
during a phase change: particles overcome forces of attraction and temperature rises
not during a phase change: particles become closer together
during a phase change: particles overcome forces of attraction and temperature rises
not during a phase change: temperature rises
Which action happens at the microscopic scale as the temperature of a substance decreases and it eventually freezes?(1 point)
Particle motion decreases, and electrostatic forces pull particles closer together.
Particle motion increases, and the particles overcome electrostatic forces.
Particle motion decreases, and the particles overcome electrostatic forces.
Particle motion increases, and electrostatic forces pull particles closer together.
Which statement describes how a macroscopic property of gases provides information about microscopic gas particles?(1 point)
Gases fill their container, showing that gas particles are strongly attracted through electrostatic forces.
Gases have a fixed volume, showing that gas particles are strongly attracted through electrostatic forces.
Gases fill their container, showing that gas particles are not tied together and can move far apart.
Gases have a fixed volume, showing that gas particles are not tied together and can move far apart.
Answer:
1) during a phase change: particles overcome forces of attraction and temperature stays the same not during a phase change: temperature rises 2)Particle motion decreases, and electrostatic forces pull particles closer together.
3) Gases fill their container, showing that gas particles are not tied together and can move far apart.
Explanation:
true or false in a chemical reaction the same number of each type of atom will always be present before and after the reaction takes place
Answer:
True
Explanation:
True because of the law of conservation of mass, the same same amount of atoms will be on both sides of the reaction.
the empirical mass is a whole number multiple of the molar mass true or false?
Answer:
True
Explanation:
1 gallon is how many mm
Answer:
0.133681 (cubic foot)
Explanation:
true or false in a chemical reaction some of the atoms will be changed into different type of atoms
Answer:
It's false
Explanation:
What is the pH of a solution with a 3.2 x 10−5 M hydronium ion concentration? (5 points)
Select one:
a.4.3
b.4.5
c.11
d.12
Answer:
b. 4.5
Explanation:
Since it is hydronium ion concentration, that means it is an acid.
pH formula = -log[H3O+]
-log(3.2 x 10^{-5} = 4.5
Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 15.4 u.
Answer:
N, B, Be, C
Explanation:
N (Nitrogen) has 14.0067 B (Boron) has 10.81 Be (Beryllium) has 9 and C (Carbon) has 12
The symbols for every chemical element that has atomic number greater than 3 and atomic mass less than 15.4 u are C, N, O, F, and Ne.
To find elements with atomic number greater than 3 and atomic mass less than 15.4 u, we'll consider the periodic table. Elements with atomic numbers 4 (Be) and higher meet the atomic number criterion. For the atomic mass, we'll look at elements with atomic masses below 15.4 u.
The chemical elements that fulfill both criteria are: Carbon (C) with atomic number 6 and atomic mass 12.01 u, Nitrogen (N) with atomic number 7 and atomic mass 14.01 u, Oxygen (O) with atomic number 8 and atomic mass 16.00 u, Fluorine (F) with atomic number 9 and atomic mass 18.99 u, and Neon (Ne) with atomic number 10 and atomic mass 20.18 u.
These elements meet the conditions of having atomic number greater than 3 and atomic mass less than 15.4 u. Therefore, the symbols for these elements are C, N, O, F, and Ne.
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How many atoms of copper in 3. 11 g of copper
Hope you could get an idea from here.
Doubt clarification - use comment section.
What does Bromine-80 decays by beta decay to?
Answer:
beta to Kr-80 or Se-80
Explanation:
sorry if wrong
What is one advantage of asexual reproduction?
O A. It is advantageous in a changing environment.
B. It is the slowest way to reproduce.
O C. It results in genetically different offspring.
D. It requires only one parent.
Answer: D.
Explanation:
Asexual reproduction requires only one parent, making it more efficient and take a shorter amount of time than sexual reproduction.
determine the gram-formula mass of stearin acid C17H35COOH
Answer:
284.48 g/mol
Explanation:
You can find the molar mass of any molecule by looking at a periodic table and adding up all of the masses of each element. When you do this with stearic acid, you get somewhere around 284.5 g/mol. Hope this helped!
which of the following forces could be used in electronic devices?
spring
gravitational
applied
magnetic
Answer:
Explanation:
poop
chemist wished to find the volume of a large barrel and had no equipment for measuring the amount of water needed to fit it. He added of 400g of pure sodium chloride barrel and filled with chlorine free water. After thorough mixing a 100 ml sample of the solution re
Answer:
Place the object in the graduated cylinder, and record the resulting water volume as "b." Subtract the volume of the water alone from the volume of the water plus the object. For instance, if "b" was 50 milliliters and "a" was 25 milliliters, the volume of the irregularly shaped object would be 25 milliliters.
I need the skeleton equation for the following sentence!
Carbon dioxide gas and solid calcium oxide are produced in the decomposition of solid calcium carbonate.
Answer:
A. CaCO(s)+SO(g)+O(g) --> CaSO(s)+CO(g)
A. CaCO(s)+SO(g)+O(g) --> CaSO(s)+CO(g)
What is a proofreading tip you should use to double check that your work is error free
How you can check to make sure your work is error-free is by:
Placing a ruler under each line as you are reading itIf you are able to, try checking your work when you are the most alert so it can be easier to track a mistakeTry to read it out loud if you are comfortable with thatYou can have a friend, family member, or teacher help read it and check over itThink about the common mistakes you makeIf your work is computer written then you can use a spell checker app such as GrammarlyRead over your work at least two or three timesHope this Helps
1) Convert the following:
900g to kg
2.87L to uL
Answer:
0.9 kg
2870000 uL
there is a conversion calculator online
What is the name of the compound K3N
A chemical compound is a material made up of several types of molecules. Therefore, potassium Nitride is the name of the compound K[tex]_3[/tex]N.
What is chemical compound?A compound is indeed a substance that is composed of two or more separate chemical elements mixed in a defined ratio in chemistry. When the elements combine, they react and generate chemical connections that really are hard to break. These bonds occur as a result of atoms sharing or exchanging electrons.
A chemical compound is a material made up of several types of molecules (or molecular entities) that include atoms from much more than one chemical element and are bound together by chemical bonds. Potassium Nitride is the name of the compound K[tex]_3[/tex]N.
Therefore, potassium Nitride is the name of the compound K[tex]_3[/tex]N.
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One student made the incomplete diagram shown below to represent the relationship between Magma, Igneous Rocks, and Metamorphic Rocks.
Which of these is the correct next step to complete the diagram?
A. Put an arrow labeled deposition and lithification, pointing from Igneous Rocks to Magma.
B. Put an arrow labeled heat and pressure, pointing from Magma to Igneous Rocks.
C. Put an arrow labeled heat and melt, pointing from Metamorphic Rocks to Magma.
D. Put an arrow labeled cools and crystallizes, pointing from Igneous Rocks to Metamorphic Rocks.
Answer:
the answer is B
Explanation:
this shows the next step and shows how magma turns into igneous rocks by heat and pressure
Help asapp plzz!!!!
Answer:
Determining what data to collect.
Explanation:
Another fact that many organisms are " linked " together is
Answer:
Individual organisms live together in an ecosystem and depend on one another. ... Some organisms can make their own food, and other organisms have to get their food by eating other organisms. An organism that must obtain their nutrients by eating (consuming) other organisms is called a consumer, or a heterotroph.
Explanation:
How many oxygen do we have in the FE2(so4)3
Explanation:
What do you mean by 'how many oxygen'?
oxygen atoms? or oxygen percentage?
if oxygen atoms is 12 atoms
*WILL GIVE BRAINLIEST* Which of the following best approximates the percentages of sand, clay, and silt in a sandy loam? Use the soil texture table below to answer.
A. Sand 40
Clay 30
Silt 30
B. Sand 60
Clay 10
Silt 30
C. Sand 20
Clay 60
Silt 20
D. Sand 25
Clay 15
Silt 60
At a certain temperature, the equilibrium pressures of NO2 and N2O4 are 1.4 bar and 0.46 bar, respectively. If the volume of the container is doubled at constant temperature, what would be the partial pressures of the gases when equilibrium is re-established?
The partial pressure of NO₂ at equilibrium is 0.70 bar and the partial pressure of N₂O₄, at equilibrium is 0.23 bar.
Let x be the mole fraction of NO₂ and x' be the mole fraction of N₂O₄.
The total pressure according to Dalton's law of partial pressure is the sum of the partial pressures of each gas.
Let P be the total pressure of the gases, P' be the partial pressure of NO₂ = 1.4 bar and P" be the partial pressure of N₂O₄ = 0.46 bar.
So, P = P' + P"
= 1.4 bar + 0.46 bar
= 1.86 bar
Since P' = xP
x = P'/P
= 1.4 bar/1.86 bar
= 0.753
Also, P" = xP
x' = P"/P
= 0.46 bar/1.86 bar
= 0.247
Now, since the volume of the container is doubled at constant temperature, we use Boyle's law to determine the new pressure. P₁.
Boyle's law states that the pressure of a given mass of gas is inversely proportional to its volume provided the temperature remains constant. It is written mathematicaly as PV = constant
So, PV = P₁V₁
P₁ = (V/V₁)P
Since V/V₁ = 1/2
P₁ = (V/V₁)P
P₁ = P/2
P₁ = 1.86/2 bar
P₁ = 0.93 bar
So, the new partial pressure of NO₂, P₂ = xP₁
= 0.753 × 0.93 bar
= 0.70 bar
The new partial pressure of N₂O₄, P₃ = x'P₁
= 0.247 × 0.93 bar
= 0.23 bar
So, the partial pressure of NO₂ at equilibrium is 0.70 bar and the partial pressure of N₂O₄, at equilibrium is 0.23 bar.
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15. Explain the advantage of using spectral analysis in the identification of an elemental
species over that of using FLAME TESTS?
Answer:
to identify the element by using flame tests
Choose the correct interpretation for the statement below:
"Relative atomic mass of T is 2"
A) The mass of one mole of T is two.
B) The mass of one T atom is double compared to the mass of one carbon-12 atom.
C)Mole ratio of T atom to 1/12 of carbon-12 atom is two.
D)The ratio of the mass of one T atom to 1/12 of the mass of one carbon-12 atom is two.
Answer:
b
Explanation:
4.
TRUE OR FALSE?
Frequency is how often a wave occurs in a given time period.
Group of answer choices
True
False
Answer:
The answer to this question is True
the name of this fatty acid is caprylic acid :
CH3(CH2)6COOH ??
Explanation:
Are you asking if that is the formula for caprylic acid? The answer is yes. CH₃(CH₂)₆COOH is the correct formula.
Caprylic acid, also known as C8 or octanoic acid, is a medium chain triglyceride (MCT) primarily found in coconut oil. It's the shortest of all the MCTs, making it the easiest for the body to break down into fuel. Once it is consumed, C8 is instantly digested and converted into ketones.
true or false
a. very little oxygen and nitrogen are found in air.
b. oxygen is the main cause of the formation of rust in iron.
c. impure air is odourless.
d. plants take in oxygen gas during respiration.
e. air contains water vapour.
Answer:
true or false
a. very little oxygen and nitrogen are found in air. false
b. oxygen is the main cause of the formation of rust in iron. false
c. impure air is odourless true
.d. plants take in oxygen gas during respiration. true
e. air contains water vapour. true
Explanation: