When a chemical reaction takes place, the starting substances (substances that will undergo the change) are called _____.
Question 2 options:
products
mixtures
reactants
yeilders
The group of elements that tend to be found as toxic gases or liquids in their pure form including chlorine, bromine and iodine are called alkali metals true or false
Final answer:
The group of elements including chlorine, bromine, and iodine are called halogens, not alkali metals. Halogens are highly reactive nonmetals in Group 17, while alkali metals are reactive metals in Group 1.
Explanation:
The statement that the group of elements including chlorine, bromine, and iodine are called alkali metals is false. These elements actually belong to a group known as the halogens, which are part of Group 17 in the periodic table. The halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At), and are notorious for being highly reactive nonmetals. The term halogen means "salt-former," which indicates their tendency to react with alkali metals and alkaline earth metals to form halide salts. Chlorine exists as a toxic gas, bromine as a liquid, and iodine as a solid at room temperature.
In contrast, the alkali metals make up Group 1 in the periodic table and include elements such as lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). These elements are quite different from the halogens, as they are highly reactive metals. With the exception of hydrogen, which is often placed in Group 1 but is not a metal, alkali metals tend to combine with halogens to form compounds like table salt (sodium chloride).
Find the ratio of the volume divided by the temperature for the first data pair. Use significant figures.
V / T = 0.72/276
From the pair of values given, the ratio of the volume to the temperature for the first data pair is, 0.0026 cm^3/K
What is a ratio?A ratio is a comparison betweentwo quantities showing how much one quantity cobtains another.
From the data provided, the first data pair is as follows:
temperature = (276 K)volume = 0.72 cm^3Ratio of volume to temperature = volume/temperature
Ratio = 0.72/276
Ratio = 0.002608 cm^3/K
The significant rule for division is the least number of significant figures used in the operation.
The least significant figure of the values given is 2.
Therefore, the ratio of the volume to the temperature for the first data pair is 0.0026 cm^3/K
Learn more about ratio at: https://brainly.com/question/25927869
Answer:
They're both 0.0026
Give an example of something that is observable but does not contain matter.
Explain.
The best example I can give that is observable but does not contain matter is:
sunlight or simply light
Light does not contain matter because it is a beam of energy or to be specific made up of packet of photons.
Nacl , or halite, dissolves in water. which type of bond is most abundant which allows it to dissolve?
How many grams of c2h5oh must be burned to raise the temperature of 400.0 ml of water from 20.0 ∘c to 100.0 ∘c? (the specific heat of water is 1.00 cal/g⋅∘c or 4.184 j/(g⋅∘c)?
The diagram below shows the different phase transitions that occur in matter.
Which best describes the process that arrow 1 represents?
Molecules are speeding up during boiling.
Molecules are depositing as ice on a surface.
Molecules are slowing down during condensing.
Molecules are moving from stationary positions.
Answer : Option A) Molecules are speeding up during boiling.
Explanation : As shown in the above image it is clearly observed that the molecules are been transformed from liquid to gaseous state. Which means that the intermolecular distance between the molecules is increasing as they are boiling and getting transformed into gaseous form. They are speeding up to form gas from liquid state and achieve stability as the heat is supplied in greater amount. Boiling of liquid is causing the liquid molecules to speed up and get transformed into gaseous molecules.
Oxygen has an atomic number of 8 and most commonly, a mass number of 16. thus, what is the atomic mass of an oxygen atom?
The elements in group 7a are known by what name? transition metals halogens alkali metals alkaline earth metals noble gases
The elements in group 7A of the periodic table are known as halogens, which include fluorine, chlorine, bromine, iodine, and astatine.
Explanation:The elements in group 7A of the periodic table are known as halogens. This group includes fluorine, chlorine, bromine, iodine, and astatine. In the periodic table, various groups have specific names. For example, group 1 elements are called alkali metals, group 2 elements are known as alkaline earth metals, group 18 elements are termed noble gases, and similarly, group 7A elements are named as halogens. Halogens have similar properties as they all have seven electrons in their outermost shell and readily gain an electron to achieve a stable electron configuration.
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On the periodic table the number of protons in an atom of an element is indicated by its
A beer maker is using yeast to make his favorite brew. how does yeast produce ethanol? through the reduction of acetaldehyde, derived from pyruvate through the oxidation of acetaldehyde, derived from pyruvate through the direct reduction of pyruvate, similar to lactic acid fermentation directly from the reduction of glucose through the reduction of lactic acid
During which stage of technological design are prototypes built
Answer:
option A, implement a solution.
Explanation:
[03.04]Based on the electronegativity values shown in the table below, which element would you expect to form a nonpolar covalent compound when combined with chlorine (Cl)? Pauling scale periodic table showing Cl is 3.0; Cu is 1.9; F is 4.0; Li is 1.0; N is 3.0 Cu F Li N
Answer:
C. Nitrogen
Explanation:
Nonpolar covalent bonds are a type of bond that occurs when two atoms share a pair of electrons with each other. An example of a nonpolar covalent bond is the bond between two hydrogen atoms because they equally share the electrons.
A bond between 2 nonmetal atoms that have the same electronegativity and therefore have equal sharing of the bonding electron pair.
The element with the same electronegativity value aas Cl is the correct option.
This is Nitrogen.
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Which characteristic of four different dinosaur fossils makes a dinosaur most similar to the present-day birds?
A- Flexible Wrist
B- Flapping ability
C- Flight Feathers
D- Primitive Feathers
If a solid forms when two ionic solutions are mixed together in a test tube, what does this indicate?
What are the major organic molecules?
A.
lipids, minerals, proteins, sulfuric acid
B.
carbohydrates, lipids, proteins, nucleic acids
C.
nutrients, nucleic acids, carbon, oils
D.
carbohydrates, nucleic acids, vitamins, minerals
Answer:
The answer is option B
Explanation:
The major organic molecules are considered as the building blocks for larger larger and more complex molecule that sustain life. These organic molecules are better known by the term "Biological Macromolecules".
Now, there are 4 categories of Biological macromolecules which are referred to as lipids, proteins, nucleic acids, and carbohydrates. The word organic is used to refer to the fact that his molecules contain the carbon element as is contained, indeed, by most molecules in any living entity.
Each macromolecule serves a vital function in a living cell. Proteins serve the point of quickening requisite chemical reactions and providing a structure to the cell. Lipids are involved in providing long term energy sources to the body by building up fat for example. Carbohydrates provide short-term energy as opposed to lipids for example in the form of cellulose. Nucleic acids are the conduits for genetic information and are contained in DNA fibers.
why scientists use mass instead of weight for their measurements
Which is the most accurate description of ionic and covalent bonding?
The most accurate description of ionic and covalent bonding is that option C. Ionic bonds happen when valence electrons are transferred between ions. Whereas, in covalent electrons are shared.
Ionic bonding involves the complete transfer of one or more electrons from one atom to another.
This transfer creates ions, atoms with a net electric charge due to the loss or gain of one or more electrons. The ions are held together by strong electrostatic forces due to the attraction between positive and negative charges.In contrast, covalent bonding involves the sharing of electrons between two atoms.
The shared electrons create a stable balance of attractive and repulsive forces between atoms. Typically, covalent bonds form between nonmetals, where both atoms involved have similar electronegativities.The complete question is as follows:
Which is the most accurate description of ionic and covalent bonding?
A. Both bonds happen when valence electrons are shared between atoms.
B. Both bonds happen when valence electrons are transferred between ions.
C. Ionic bonds happen when valence electrons are transferred between ions.
D. Ionic bonds happen when valence electrons are shared between atoms.
A mixture of 0.220 moles co, 0.350 moles f2 and 0.640 moles he has a total pressure of 2.95 atm. what is the pressure of co?
The partial pressure of CO is 0.536 atom.
Further ExplanationDalton's Law of Partial Pressure states that the total pressure of a mixture of non-reacting gases is equal to the sum of the partial pressures of the individual gases. Mathematically, it can be represented as follows:
[tex]P_{total} \ = P_{1} + P_2 + P_3+...P_n[/tex]
If the total pressure is known as well as the number of moles of the gases in the mixture, the partial pressure of a component as can be calculated using the equation below:
[tex]P_x = P_{total} \times \frac{n_x}{n_total}[/tex]
where:
Pₓ is the partial pressure of gas X
P(total) = total pressure of the mixture
nₓ = number of moles of gas X
n(total) = total number of moles of gas
To solve the problem, first sort the given:
n(total) = 0.220 mol CO + 0.350 mol F₂ + 0.640 mol He = 1.21 molesn(CO) = 0.220 molP(total) = 2.95 atmThen we plug in the given values into the equation above:
[tex]P_{CO} = 2.95 \ atm \times \frac{0.220 mol CO}{1.21 \ mol}\\\\\boxed {\boxed {P_{CO} = 0.536 \ atm}}}[/tex]
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The pressure of CO is [tex]\boxed{{\text{0}}{\text{.536 atm}}}[/tex] .
Further explanation:
Dalton’s law:
According to this law, the total pressure of the gaseous mixture is the sum of partial pressure of each gas. The given mixture contains CO, [tex]{{\text{F}}_2}[/tex] and He. The expression to calculate partial pressure of CO is,
[tex]{P_{{\text{CO}}}} = {X_{{\text{CO}}}}\cdot {P_{{\text{total}}}}[/tex] ….. (1)
Here,
[tex]{P_{{\text{CO}}}}[/tex] is the partial pressure of CO.
[tex]{P_{{\text{total}}}}[/tex] is the total pressure of the mixture.
[tex]{X_{{\text{CO}}}}[/tex] is the mole fraction of CO.
The mole fraction of CO is calculated as follows:
[tex]{X_{{\text{CO}}}} = \frac{{{\text{Number of moles of CO}}}}{{{\text{Total number of moles}}}}[/tex] …… (2)
The formula to calculate total number of moles in the mixture is as follows:
[tex]{\text{Total number of moles}}={\text{Moles of}}\;{\text{CO}}+{\text{Moles of }}{{\text{F}}_2}+{\text{Moles}}\;{\text{of}}\;{\text{He}}[/tex] …… (3)
Substitute 0.220 mol for the moles of CO, 0.350 mol for the moles of [tex]{{\text{F}}_2}[/tex] and 0.640 mol for the moles of He in equation (3).
[tex]\begin{aligned}{\text{Total number of moles}}&={\text{0}}{\text{.220 mol}}+{\text{0}}{\text{.350 mol}}+{\text{0}}{\text{.640 mol}}\\&={\text{1}}{\text{.21 mol}}\\\end{aligned}[/tex]
Substitute 0.220 mol for the moles of CO and 1.21 mol for the total number of moles in equation (2).
[tex]\begin{aligned}{X_{{\text{CO}}}}&=\frac{{{\text{0}}{\text{.220 mol}}}}{{{\text{1}}{\text{.21 mol}}}}\\&= 0.1818\\\end{aligned}[/tex]
The value of [tex]{X_{{\text{CO}}}}[/tex] is 0.1818.
The value of [tex]{P_{{\text{total}}}}[/tex] is 2.95 atm.
Substitute these values in equation (1).
[tex]\begin{aligned}{P_{{\text{CO}}}}&=\left({0.1818}\right)\left({{\text{2}}{\text{.95 atm}}}\right)\\&=0.{\text{53631 atm}}\\&\approx0.{\text{536 atm}}\\\end{aligned}[/tex]
So the partial pressure of CO is 0.536 atm.
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Answer details:
Grade: Middle School
Subject: Chemistry
Chapter: Gases and the kinetic-molecular theory
Keywords: moles, pressure, 0.220 mol, 0.640 mol, 0.0350 mol, 0.536 atm, 2.95 atm, He, CO, F2, moles of CO, moles of F2, moles of He, Dalton law and pressure of CO.
Is soda an element compound heterogeneous mixture or solution?
If the o2 is collected over water at 25 c (298 k) and 724.0 mm hg total pressure, how many mols o2 will a 1.00 l sample of collected gas contain?
Which of the following describes the characteristics of a gas?
Made up of particles packed closely together, having both definite shape and definite volume
Made up of particles packed relatively close together, having an indefinite shape but a definite volume
Made up of particles that are far apart from each other, having both indefinite shape and indefinite volume
Made up of positively charged particles and negatively charged electrons, having both indefinite shape and indefinite volume
Answer: The correct statement is made up of particles that are far apart from each other, having both indefinite shape and indefinite volume
Explanation:
There are 4 states of matter:
Solid state: In this state of matter, the particles are closely packed and they do not have any space between them. Thus, this state of matter has the highest intermolecular forces of attraction between them.This state have a definite shape and volume.
Liquid state: In this state of matter, the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. The intermolecular forces between the particles are less as compared to the solid state.This state have a definite volume but does not have a fixed shape and they can take up the shape of container in which they are kept.
Gaseous state: In this state, the particles are loosely arranged and have a lot of space between them. Thus, this state of matter has the lowest intermolecular forces of attraction between them.This state have indefinite volume as well as shape. It can take up the volume and shape of the container in which they are kept.
Plasma state: In this state of matter, a hot ionized gas consisting of equal number of positively charged ions and negatively charged electrons are present.This state have indefinite volume as well as shape.
Hence, the correct statement is made up of particles that are far apart from each other, having both indefinite shape and indefinite volume
A 0.08541 g sample of gas occupies 10.0-ml at 288.5 k and 1.10 atm. upon further analysis, the compound is found to be 13.068% c and 86.932% br. what is the molecular formula of the compound? (order: c, x)
PV = mRT: gas law.
M = [tex]\frac{n}{m}[/tex] : molecular mass
Use: M = [tex]\frac{mRT}{PV}[/tex]
Where
m = 0.04343 g
P = 1.10 atm
V = 0.0100 L
R = 0.08205746 (14) L atm K mole
T = 293.0 K
M: the molecular mass of the gas.
Then take the mass of this molecule, the molecular mass of the atom (C & Cl), and also the proportion of mass given to search out the amount of moles per mole of gas.
Further explanation
The chemical formula is a component of a formula, that has associate understanding of a substance that determines the kind and a relative range of atoms that area unit in this substance. Or in different languages, a formula are often given that contains data concerning the atoms that form up a selected chemical composition.
Chemical formula is split into 2 specifically chemical formula and formula. The formula announces that the formula mentioned will prove the molecules of the mix atoms. whereas the formula is that the original formula of a composition. The chemical formula are often determined if the relative molecular mass is thought.
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Details
Class: highschool
Subject: Chemistry
Keywords: Mole, Formula, Mass
Why is a very small amount of cerium oxide nanoparticles need: A) the nanoparticles are elements
B) the nanoparticles are very reactive
C) the nanoparticles have a high surface area of volume ratio
A very small amount of cerium oxide nanoparticles is needed due to their high surface area to volume ratio, which enhances reactivity and efficiency in chemical applications such as catalysis.
The answer is C) the nanoparticles have a high surface area to volume ratio. This high surface area to volume ratio is significant because it provides more active sites for reactions to occur. In the field of nanotechnology, substances like cerium oxide nanoparticles demonstrate different and often enhanced properties when compared to their bulk counterparts due to their tiny size (between 1 and 100 nm). As particles become smaller, their surface area becomes larger in comparison to their volume, which is particularly significant for chemical reactions which typically occur on surface sites.
The properties that arise from this high surface area to volume ratio include lower melting points, higher vapor pressures, and increased reactivity. Specifically, nanoparticles like cerium oxide are highly efficient in applications such as heterogeneous catalysis, where reactions occur at the surface of the catalyst. A small amount of these nanoparticles can provide a large surface area, thus making reactions more efficient and reducing the amount of material required.
1 What do strong acids and strong bases have in common?
A They both partially dissociate, with reverse reactions occurring.
B They both dissociate completely, with little or no reverse reactions.
C They both remain intact when placed in water, with no dissociation taking place. D They both dissociate completely, with reverse reactions constantly taking place.
Answer: Option (B) is the correct answer.
Explanation:
Strong acids are the acids which completely dissociate in a solution of water. Similarly like strong acids, strong bases also dissociate completely into a solution of water.
For example, [tex]HCl \rightarrow H^{+} + Cl^{-}[/tex]
[tex]NaOH \rightarrow Na^{+} + OH^{-}[/tex]
Also, there is little or no reverse reactions when strong acids and bases completely dissociate into ions.
Thus, we can conclude that strong acids and strong bases have in common that they both dissociate completely, with little or no reverse reactions.
What metric unit is used for measuring an eyelash?
What determines the horizontal arrangement of the periodic table?
In the carbon-oxygen cycle, carbon dioxide is used for _____ and oxygen is used for _____. respiration, photosynthesis ozone, respiration photosynthesis, respiration evaporation, condensation
photosynthesis ozone and condensation good day
What 2 groups of rocks are formed from all 3 kinds of rocks?
In theory, all 3 can make
up each Sedimentary, Metamorphic, and Igneous rocks.
However, the progression of metamorphosis is really kind of
linear, and it is only possible to metamorphose a Metamorphic rock further, so
the answer to this question would be:
Igneous and Metamorphic rocks
What are the subatomic particles that are responsible for comprising the atom's atomic mass?