The empirical formula of the metal iodide is Cr2I.
Mass of Chromium = 23.98
Molar Mass of Chromium = 51.9961
= 0.461 mol
Molar Mass of iodide = 126.9
= 199.6-23.88/126 = 1.394
The ratio between
Chromium and iodinei is1:2.So, the empirical formula is therefore Cr2I
Empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.[1] A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2. Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.
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What organelle surrounds and supports plant cells to give them support and structure?
Group of answer choices
Cell Wall
Nucleus
Cell membrane
Answer:Cell membrane
Explanation:Plant cells don’t have cell wall
To make a water-insoluble substance water-soluble, a chemist could add groups with bonds between.
To make a water insoluble substance water soluble, a chemist can add groups with bonds between atoms with different attraction for electrons.
A water soluble drug or substance is easier to be taken up in your digestive system.
Positive and negative are attracted which makes a cohesive structure. When polar compounds or ions gets added to the water, these compounds breaks down or degrades into smaller components. They also might dissolve to become the part of the solution.
The partial charges of water attracts the various parts of a compound. When attraction occurs, it gets more soluble in the water.
Thus, by adding groups with bonds between atoms with different attraction for electrons, substance can become water soluble.
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Which atoms in the amino acids become the h2o molecule produced by their action in model?
Atoms in the amino acids become the h₂O molecule produced by their action in the model and come off from the central carbon and nitrogen but not from the carboxyl, R side chain, or amine.
An amino acid is a group of organic molecules that consist of a basic acidic carboxyl group (―COOH), amino group (―NH2), and an organic R group (or side chain) that is different from each amino acid. Amino acid, the term is a short form of α-amino [alpha-amino] carboxylic acid.
Whereas, the peptide bond is the chemical bond which is a chemical bond formed between two molecules when the carboxyl group of a particular molecule reacts with the amino group of the other molecule, leading to releasing a molecule of water (H2O).
Each molecule consists of a central carbon atom referred to as the α-carbon, to which both a carboxyl group and amino are attached. The remaining two bonds of the α-carbon atom are generally occupied by the R group and a hydrogen (H) atom .
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. Describe how liquid changes to gas using the following terms at least once.
Word Bank: particle speed, thermal energy, particle spacing, liquid, gas, evaporation!
(please give an answer quickly!)
What is the mass of an object with a density of 1.35 g/ml & a volume of 24 ml?
The mass of an object with a density of 1.35 g/ml & a volume of 24 ml is 32.4 g/ml.
What is mass?
Mass is the quantity of matter in a physical body.
The product of the molar mass of the compound and the moles of the substance are defined as mass.
Density is the mass per unit volume. Volume is the space taken by an object. Density, mass, and volume are interrelated to each other.
Given, that the density is 1.35 g/ml
The volume is 24 ml
The formula is
mass = volume x density
mass = 24 x 1.35 = 32.4
Thus, the mass of the object is 32.4 g/ml.
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Rick is a biologist who hypothesized that squid would swim faster in warm water than in cold water. rick conducted his experiment. he discovered that squid swim at the same rate in warm and cold temperatures. what should rick do next?
Scientific investigations can be used to reach the solution to the problem. The hypothesis of the experiments can be performed and the results and findings should be reported. Thus, option A is correct.
What is Scientific investigation?Scientific investigations have been defined as the series of steps that are used to solve the question and test the hypothesis to reach the solution. It uses logical means to experiment and research the topic.
After conducting an experiment the observed data, results, and findings must be reported so the process and the technical results can be used to define the issue or the problem that acts as a conclusion.
Therefore, option A. Rick must report his findings.
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Your question is incomplete, but most probably your options were,
A. Report his findings.
B. Throw away his experiment notes.
C. Report that squid swims faster in warm water.
D. Change his hypothesis.
Which name is inconsistent with iupac nomenclature rules? 2-ethyl-4-methylhexane 2,3-dimethyl-4-propyldecane 4,5-dimethyloctane 3,3,5-triethyl-3-methylheptane 3,4-dimethyl-4-propyloctane
The correct answer is 4-ethyl-2-propylhexane.
Nomenclature is a device for giving names to matters within a specific career or field. For instance, you may additionally have heard of binomial nomenclature in biology class. It refers to the way of referring to living matters via two names, like calling people Homo sapiens.
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A ball-and-stick model of a molecule of formaldehyde, ch2o, is made from the following components: what do the sticks represent?
In chemistry, the ball-and-stick model is a molecular ideal of a chemical matter which is to expose both the three-dimensional position of the atoms and the bonds among them. The atoms are normally symbolise by spheres, join by rods which shows the bonds.
Formaldehyde forms formaldehyde structure bond it shares double bond with O2 atoms.
Formaldehyde also known as methanol .
Methanol is colourless.
It is flammable.
It is gas at room temperature.
Methanol having pungent odor and it is a volatile organic compounds.
It is made by the composition of Hydrogen, oxygen, and carbons.
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You have just started brewing beer at home, and your first batch is now ready. You used the yeast saccharomyces cerevisia, which can perform both aerobic cellular respiration and fermentation. When you test the beer, you determine that the alcohol content is almost zero. What could have been present in the fermentation reaction apparatus that caused this problem?.
The oxygen present in the fermentation reaction apparatus has caused this problem.
The biological process that produces beer is fermentation. The yeast used to make beer, Saccharomyces cerevisiae, is capable of both fermentation and cellular respiration.
Saccharomyces cerevisiae would engage in aerobic cellular respiration in the presence of oxygen, converting glucose to carbon dioxide and producing energy. However, without oxygen, the yeast engages in fermentation and turns the glucose into ethanol (alcohol).
If the alcohol concentration is almost zero following the brewing method, oxygen may be present in the fermentation reaction apparatus. Thus, the Saccharomyces cerevisiae will perform aerobic cellular respiration rather than fermentation in the presence of oxygen.
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Calculate the number of atoms per cubic meter in aluminum. the density of al is 2.71 g/cm3, while its atomic weight is 26.98 g/mol.
The number of atoms per cubic meter in aluminum is 6.04 x 10²².
What is density?"Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume."
The density of Al is 2.71 g/cm3
The atomic weight of Aluminum is 26.98 g/mol.
The Avogadro's number is 6.023 x 10²³
To find the number of atoms per cubic meter
N = ρNa / A
N = 2.71 x 6.023 x 10²³ / 26.98 = 6.04 x 10²²
Thus, the number of atoms per cubic meter in aluminum is 6.04 x 10²².
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Cobalt-60 is produced by neutron activation. in this process, one neutron is absorbed by the nucleus of the parent isotope. what is the parent isotope? give both the mass number and atomic number.
The parent isotope is cobalt-59 (see the picture below).
The mass number is 59 and atomic number is 27 of the parent isotope.
Neutron activation is the process in which atomic nucleus capture free neutron or neutrons.
Cobalt-60 is produced in nuclear reactors in process of neutron activation from parent isotope cobalt-59 (see the picture below).
Atomic number (Z) is total number of protons and mass number (A) is total number of protons and neutrons in a nucleus.
Cobalt-59 and cobalt-60 are the isotopes of chemical element cobalt.
Isotopes are chemical elements with same atomic number (Z), but different mass number (different number of neutrons).
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In this lab experiment, you will react copper(ii) chloride and aluminum. you will look for clues as to which substance was in excess and which limited the reaction
How can you identify the reactant that is restricting a chemical reaction while watching it take place? ”
What is the real purpose of scientific study?Building scientific knowledge, or discovering rules and positing ideas that may explain natural or social occurrences, is the aim of scientific study. It is crucial to recognize that this knowledge might be inaccurate or perhaps quite distant from the truth.
An experiment is what?A hypothesis, or an anticipation about how a certain process or phenomena operates, is typically the subject of an experiment. However, an experiment may also seek to address a hypothetical issue or support earlier findings without having any preconceived notions about what would be revealed.
Complete question -
In this lab experiment, you will react copper(ll) chloride and aluminum. You will look for clues as to which substance was in excess and which
limited the reaction. Write an investigative question that describes the
scientific goals of this experiment. Make sure that your question applies to any reaction. Investigative Question:
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Hydrogen+peroxide+used+as+a+6%+solution+is+used+to+clean+wounds+on+skin+as+a(n)+__________,+and+it+is+also+used+as+a+stronger+solution+(>30%)+as+a(n)+__________.
Hydrogen peroxide used as a 6% solution is used to easy wounds on pores and skin as an antiseptic ,and it is also used as a stronger answer (>30%) as an antimicrobial agent and an oxidizing agent.
Hydrogen peroxide (H2O2) is a topical antiseptic utilized in wound cleaning which kills pathogens through oxidation burst and nearby oxygen manufacturing. H2O2 has been said to be a reactive biochemical molecule synthesized by means of various cells that impacts biological behavior thru multiple mechanisms: alterations of membrane potential, technology of latest molecules, and changing intracellular redox balance, which leads to activation or inactivation of different signaling transduction pathways.
As an disinfectant, it additionally treats wounds. Hydrogen peroxide capabilities as an oxidizing element in personal care merchandise, which includes colorants and toothpastes, and gives a lightening/whitening impact.
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an electrical conductor is in a strong magnetic field. how is the conductor affected if it is connected to a battery so that current flows through the conductor?
When placed in a magnetic field, a current-carrying conductor experiences a mechanical force that can cause the conductor to move.
How does the magnetic field impact current?
Current and magnetic force are directly inversely connected in a homogeneous magnetic field for a straight current-carrying wire. As a result, the force is inversely related to the size of the current. This translates to: If the current is doubled, the force on the conductor will also double.
How do the fields of electricity and magnetism interact?Electric fields are created by differential voltages; the stronger the voltage, the stronger the resulting field. Magnetic fields are produced by electric current, and the stronger the current, the stronger the magnetic field. There will always be an electric field present even when there is no current flowing.
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Rubidium lies below potassium in Group 1. Predict the approximate value for the melting point of rubidium. Give a reason for your answer.
Rubidium's valence shell electron, "(ns(1))," is more loosely bound than in potassium due to the larger atomic size of rubidium. As a result, Rubidium is found in Group 1 below potassium.
A valence shell electron is what?When an atom's outer shell is open, a valence electron, which is an electron attached to it, can take part in the creation of a chemical bond.
To form a shared pair in a single covalent bond, each atom in the bond contributes one valence electron.
an atom's valence shell electron, which is its outermost shell and which can be shared or transferred to another atom.
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What is the actual order that information follows as it travels through a neuron?
Dendrites -> Soma -> Axon -> Terminal buttons
is the actual order that information follows as it travels through a neuron
What is neuron?Neurons are messengers of information. Between various brain regions and between the brain and the rest of the nervous system, information is transmitted using electrical impulses and chemical signals. Without the action of neurons and their supporting cells, the glial cells known as oligodendrocytes and astrocytes, humans would not be able to think, feel, or act.
A cell body, an axon, and two extensions called a dendrite make up the three basic components of a neuron. There is a nucleus inside the cell body that regulates the cell's functions and houses its genetic material. The axon, which resembles a long tail, delivers signals from the cell. Dendrites serve as the cell's messengers and resemble the tree's branches.
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The property of water whereby molecules tend to stick to objects is called? cohesion surface tension dissolving ability adhesion viscosity
The property of water whereby molecules tend to stick to objects is called adhesion. The correct option is d.
What is adhesion?Adhesion is a property of a molecule to join its molecule with the surface of the other object. This happens due to the attraction of force between the surface of two substances.
So, when water molecules stick to the surface of other objects, it is adhesion. When the water molecules are attracted towards is called cohesion. This happens with water due to the reason that water is a polar substance.
Thus, the correct option is d. adhesion.
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ASAP!!! SCIENCE ITS DUE TOMZ
Answer:
1.
Groups - Verticle columns in the periodic table, signifies the number of valence electrons in the element.
vs.
Periods - Horizontal rows in the periodic table, signifies the number of shells in the element.
2. Because the group number corresponds to the number of valence electrons in an atom an element in group 5 (like Phosphorus) has 5 valence electrons.
Added information: a Valence electron is an electron in the outermost shell of an atom.
Sugar is a compound made of the elements hydrogen, carbon, and oxygen. Which element is left on the spoon after the sugar is heated?
Answer:
carbon is the element left on the spoon after the sugar is heated.
The carbon element is left on the spoon after the sugar is heated.
What are compounds?Compounds is defined as a material formed by chemical bonding between two or more chemical element.
Elements are defined as a species of atoms that has given number of protons in their nuclei, including pure substance consisting only of that species.
Elements are fundamental materials of which all the matter is composed.
Sugar is a compound made up of hydrogen, carbon and oxygen are the elements present in it.
Thus, the carbon element is left on the spoon after the sugar is heated.
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What is the approximate power per area emitted by the inside wall of an oven when baking a cake in w/m2?
The approximate power per area emitted by the inside wall of an oven when baking a cake in w/m2 is 6 x 3^4.
What is power per area?Comparing the surface power density of various industrial energy sources is crucial. Geographer Vaclav Smil popularised the idea. In the pertinent literature, the phrase is sometimes abbreviated to "power density," which may cause confusion with similar or homonymous concepts.
The power obtained per square metre of Earth's surface area utilised by a particular energy system, including all supporting infrastructure, manufacturing, fuel mining (if relevant), and decommissioning, is expressed in W/m2. Due to the high power density of fossil fuels and nuclear energy, substantial amounts of electricity may be produced in very small spaces at power plants.
6 x 3^4 (for reference Humans are about 300 K)
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What is the nitrogen source of for the carbamoyl phosphate in pyrimidine synthesis? tetrahydrofolate glutamine orotate urea ammonium iron
Glutamine is the nitrogen source of the carbamoyl phosphate in pyrimidine synthesis.
Carbamoyl Phosphate generates when enzyme bound carbamate reacts with second ATP, with release of free enzyme, and ADP.
The atoms of pyrimidine ring comes from the aspartic acid and carbamoyl phosphate (CP). The first step of the pathway is the formation of former or latter molecule. The enzyme named carbamoyl phosphate synthetase II catalyses the latter molecule. Glutamine is used by this enzyme as the nitrogen source.
N-acetylglutamate activates this mitochondrial enzyme carbomoyl phosphate synthetase but it is not an allosteric activator. It is located in the cytoplasm.
CPS II catalyzes the synthesis of carbamoyl phosphate which is ATP dependent synthesis from glutamine or ammonia.
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What is the atomic number of Gold
Which observation most likely indicates that only a chemical change has taken place?(1 point)The change cannot be reversed.
The shape changes
States of matter changes.
A reaction occurs.
Answer:
Correct answer is “a reaction occurs” because in the readings it says specifically chemical changes can be reversed but it’s not easy.
Explanation:
H2po4-1 has a pka of 6.86. if the concentration of h2po4-1 is 0.622 mm and the concentration of h1po4-2 is 0.038 mm what is the ph of the solution?
H2po4-1 has a pka of 6.86. if the concentration of h2po4-1 is 0.622 mm and the concentration of h1po4-2 is 0.038 mm the ph value in the solution is 8.3
pH stand for potential hydrogen the pH of a solution also can be determined by finding the pOH. determine the concentration of the hydroxide ions by dividing the molecules of hydroxide by the volume of the solution and here to find pH value in the solution here the formula is
pH=pka log acid/base
ph=pka log h2po4-1/h1po4-2
ph=6.86×log0.622/ 0.038
ph=6.86×log16.36
ph=6.86×1.21
ph=8.3
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if correct I will mark brainliest
When a solid, such as a truck, moves from one place to another, the volume of the truck stays the same. What would be true about the shape of the truck? (2 points)
Group of answer choices
The truck changes its shape.
The truck decreases its shape.
The truck increases its shape.
The truck keeps its shape.
Answer:
Explanation:
The option that would be true about the shape of the truck is that the truck keeps its shape. Thus, the correct option is D.
What is the volume of solid?
The volume of a solid may be defined as the process of measuring the overall space that an object takes up in its physical structure.
The volume of any solid alters with respect to its shape. If its shape increases, the volume definitely increases, while if its shape decreases, the volume ultimately reduces.
Therefore, the option that would be true about the shape of the truck is that the truck keeps its shape. Thus, the correct option is D.
A 0.50-quart jar contains 2.0 pounds of honey. what is the density of the honey in g/ml?
A 0.50-quart jar contains 2.0 pounds of honey. 1.9 g/ml is the density of the honey.
Population density (in agriculture, forest stand, or plant density) is a measure of population per unit area or, exceptionally, per unit volume. It is a quantity of type number density. It applies to living things in general, mainly humans. It's an important geographical term. Simply put, population density is the number of people living per square kilometer.
Urban populations, especially urban areas, strongly depend on the definition of "urban area" used. It is almost always denser only in the center than when it includes suburban settlements and intervening rural areas, such as agglomerations and metropolitan areas. Area (the latter may include neighboring cities).
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In the experiments conducted by avery, mccarty, and macleod, which hypothetical result would indicate that protein, not nucleic acid, was griffith's transforming substance?
The hypothetical result that would indicate Griffith's transforming substance is only the extracts from heat-killed cells treated with RNAS are unable to transform nonvirulent bacteria into virulent bacteria.
What is an experiment?An experiment is a scientific experiment that is conducted by scientists to prove a hypothesis.
In the experiments conducted by the scientists, the pure cells did not produce favorable findings, but they did exhibit transform ants that were quite similar to DNA.
Thus, the correct option is A, Only the extracts from heat-killed cells treated with RNAS are unable to transform nonvirulent bacteria into virulent bacteria.
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The question is incomplete. Your most probably complete question is given below:
Only the extracts from heat-killed cells treated with RNAS are unable to transform nonvirulent bacteria into virulent bacteria.
All the extracts from heat-killed cells are able to transform to nonvirulent bacteria.
Only the extracts from heat-killed cells treated with D.
The RNA of the bacteria used in this experiment was degraded.
A 10 mg mosquito-sized insect needs a mere millimeter of total foot edge to be supported by surface tension. how about a 60 kg man?
A 60 kg man would need a 8000 meters of total foot edge to be supported by surface tension.
Many insects can walk on the water, because of the surface tension at the water surface.
Surface water molecules attract more strongly to the water molecules around them and create a high surface tension with smaller surface area of a water.
The water molecules at the surface do not have other water molecules to form hydrogen bonds, only below and to either sides, like other water molecules that hydrogen bond with other water molecules on all sides.
The surface tension at the water surface is not strong enough to support man on the water.
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If 247.65 grams of barium hydroxide react completely, how many grams of water should theoretically be produced?
If 247.65 g of barium hydroxide react completely, the grams of water produced theoretically should be 52.03 g.
The balanced chemical equation for reaction is :
2HNO₃ + Ba(OH)₂ → 2H₂O + Ba(NO₃)₂
To calculate number of moles, we will use the equation:
Number of moles = Given Mass g
Molar Mass g/mol
Moles of Ba(OH)₂ -
Number of moles = 247.65 g = 1.4454 moles
171.34 g/mol
Stoichiometry is defined as the number before chemical formula in a balanced reaction.
According to stoichiometry, the limiting reagent is barium hydroxide as it limits the formation of product. Yields can only be found using limiting reagent.
1 mole of Ba(OH)₂ produces = 2 moles of H₂O
Therefore, 1.4454 moles of Ba(OH)₂ requires = 2.891 moles
Mass of H₂O is = moles × molar mass
= 2.891 × 18 = 52.03 g
Thus, the theoretical yield produced is 52.03 g
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When a liquid changes to a solid
what happens to it's density?
Answer:
When a liquid is remained a liquid the the particles are loose but as the liquid turns into solid the particle get more compact and closer together. So in that case the liquid will have lower density.
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