Answer:
average speed = 32
Explanation:
the formula is speed = distance / time
so s = d / t
s = 16 m / 0.5 s
s = 32 meter per second
Solid calcium carbide, cac2, reacts with water to form an aqueous solution of calcium hydroxide and acetylene gas, c2h2
Solid calcium carbide, cac2, reacts with water to form an aqueous solution of calcium hydroxide and acetylene gas, c2h2
CaC2(s)+2H2O(l)→Ca(OH)2(aq)+C2H2(g)
A solution is a homogeneous mixture of two or more components with particle sizes less than 1 nm. Common examples of solutions are the sugar in water and salt in water, soda water, etc. All components appear as one phase in the solution.
Examples of solutions include salt water, rubbing alcohol, and sugar dissolved in water. If you mix salt and water and look closely, you will not see any salt particles and you will have a homogeneous mixture.
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When the ____________ group of fatty acids reacts in a dehydration synthesis reaction with the ____________ group of glycerol, fats or oils are formed.
When the carboxyl group of fatty acids reacts in a dehydration synthesis reaction with the hydroxide group of glycerol, fats, or oils are formed.
Fats and oils are made up of fatty acids and glycerol.
A fatty acid has a carboxyl group attached to a long chain of carbon atoms.
Based on the presence or absence of double bonds, fatty acids are of two types, saturated (without double bond) or unsaturated (with one or more C=C double bonds), as shown in the adjoining diagram.
Glycerol is chemically trihydroxy propane. It has three hydroxyl groups.
When the carboxylic group of fatty reacts in a dehydration synthesis reaction with the hydroxyl group of glycerol, fats or oils are formed. When these groups react, an ester bond is formed.
This reaction is illustrated in the adjoining diagram.
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A student in chm 11500 lab measured a 10. 00-ml sample of deionized water into a pre-weighed erlenmeyer flask using a 50-ml buret and recorded the mass as 9. 95 g. The temperature of the sample was 24 °c. The percent error in the volume measurement was __________________.
The percent error in the volume measurement was 0.238 %.
d(water) = 0.99738 g/ml; density of the water at 24°C
V(water) = 10.00 m; volume of the water sample
m(water) = d(water) × V(water)
m(water) = 0.99738 g/ml × 10.00 ml
m(water) = 9.9738 g; mass of the water sample
error = (9.9738 g - 9.95 g) ÷ 9.9738 g · 100%
error = 0.238 %
The percent error is an error between an observed value and the true value of a measurement.
In this problem, an observed value is 9.95 grams and the true value of a measurement is 9.9738 grams.
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The molecules in a sample of solid so2 are attracted to each other by a combination of?
The molecules in a sample of solid so2 are attracted to each other by a combination of London forces and dipole-dipole interactions.
What are London forces?Other names for London dispersion forces include dispersion forces, London forces, fluctuation induced dipole bonds, instantaneous dipole-induced dipole forces, and weakly van der Waals forces. Since the electrons are often arranged symmetrically with regard to the nucleus, they serve as a form of electrically symmetric force between atoms and molecules.
What are dipole dipole interactions?Dipole-dipole interactions, which result from the close association of induced or permanent dipoles, are weak interactions. Van der Waals interactions are the name given to these forces taken as a whole. These interactions are widespread in proteins and range widely in strength.
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A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.01 atm and a volume of 12.5 l to a final volume of 29.3 l. (a) what is the final pressure of the gas?
By ideal gas approximation, the final pressure is 2.14 atm.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
V1 = 12.5 L
V2 = 29.3 L
P1 = 5.01 atm
When the initial and final temperature is the same, we can use the ratio of pressure and volume as
P1 . V1 = P2 . V2
5.01 . 12.5 = P2 . 29.3
P2 = 2.14 atm
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how are wavelength, frequency and energy related in an electromagnetic wave?
There are actually two models of electromagnetic radiation. One is the wave model, of course, and the other is the particle model, which postulates that radiation is made up of a stream of discretely sized particles called light quanta.
Different ideas about the energy connected to radiation are produced by the two theories.
The energy is stored in the EM fields that are moving through a region when the radiation is thought of in the wave model as an EM wave.
The wave oscillations in the wave model hold the energy.
Conceptually, the particle model differs slightly. Since each discrete particle in radiation has a specific amount of energy, the total energy of the radiant beam is determined by the number of discrete particles that make up the radiation.
In this scenario, the energy of each quantum is denoted by the formula E = h v, where h is Planck's constant.
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N the secondary structure of a protein, what bonds, other than peptide bonds, are formed?
In secondary structure of a protein, other than peptide bonds, hydrogen bond are formed.
The secondary structure contains regions of amino acid chains that are stabilized by hydrogen bonds from the polypeptide backbone. arrangement of hydrogen bonds between the peptide it is an arrangement nitrogen's and the peptide carbonyl oxygens of different amino acid residues. the most common types of secondary structures are the α helix and the β pleated sheet. both structures are held in shape by hydrogen bonds, which form between the carbonyl O of one amino acid and the amino H of another.
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The hydrogens and oxygen of a water molecule are held together by ______ bonds. select all that apply.
The hydrogens and oxygen of a water molecule are held together by covalent bonds.
What are covalent bonds?A covalent bond is an electron exchange that causes the production of electron pairs between atoms. Covalent bonding is a stable equilibrium of the attractive and repulsive forces between two atoms that occurs when they share electrons.
Bonding pairs or sharing pairs are other names for these electron pairs. Because electrons are shared among several molecules, each atom can reach the equivalent of a full valence shell, resulting in a stable electronic state.
In organic chemistry, covalent bonds are much more common than ionic bonds. Covalent bonds unite the atoms in a single water molecule, whereas hydrogen bonds join two water molecules. Water develops a covalent bond when oxygen shares an electron with each hydrogen atom.
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If you separated a gypsum stone cast from an alginate impression beyond the optimum time interval, you could expect the cast to be?
The 12-hour time of contact between alginate and therefore the plaster cast is not recommended because it influences the quality of the plaster cast
What is gypsum cast?Gypsum may be a resource that is found by doing a variety of activities. Gypsum are often crafted into Gypsum Orbs, which may then be turned into special caches is called Gypsum Casts. Gypsum Casts are gear type specific, and when opened, guarantee an Expertise bump for that sort of gear as well as an item of that type.
Is gypsum utilized in cast?Gypsum products are one among the most broadly utilized dental materials for fabrication of dental casts and dies which are used as for further construction of indirect dental restorations
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Bubbling during a chemical reaction is an indicator that a ______
I has been produce
Answer: gas
Explanation:
Which type of bond exemplifies a weak chemical bond? covalent bonds in solution hydrogen bonds in solution ionic bonds in solids nonpolar covalent bonds in solids
Covalent bonds in solution, hydrogen bonds in solution, ionic bonds in solids, nonpolar covalent bonds in solids- the weakest bond is hydrogen bond.
What is a chemical bond?
A chemical bond is a strong bond that can be formed between atoms, ions, or molecules to create chemical compounds. In covalent bonds, the electrons are shared, whereas in ionic bonds, the electrostatic attraction of two ions with opposing charges forms the link. Strong bonds, also known as primary bonds, include covalent, ionic, and metallic ties. Weak bonds, also known as secondary bonds, include dipole-dipole interactions, the London dispersion force, and hydrogen bonds.
Since there is no necessity for an electron exchange during formation, the hydrogen bond is weak. As a result, it is simpler to break apart a hydrogen connection between two molecules.
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if correct will mark brainliest
The beaker and the graduated cylinder are both holding liquids. The beaker has lemonade and the cylinder has grapefruit juice. What statement best compares the two liquids? (2 points)
a tall narrow cylinder and a short wide beaker with one hundred milliliters of yellow liquid in them
Group of answer choices
The mass of the liquid does not change if the volume of the liquid changes.
The volumes of the two liquids are exactly the same.
The volume of the liquid in the beaker is greater because it is short and round.
The volume of the liquid in the graduated cylinder is greater because it is taller and narrower.
Answer:
Same amount of liquid and take up same amount of liquid but they are in different containers
Explanation:
How many seconds in a year? (Assume 30 days in an average month)
What type of bond forms when the sulfur atoms in two adjacent protein chains are joined together?what type of bond forms when the sulfur atoms in two adjacent protein chains are joined together?
Disulfide bond forms when the sulfur atoms in two adjacent protein chains are joined together.
What kinds of side bonds are there in proteins?When the sulfur atoms in two adjacent protein chains come together, strong chemical side bonds form. Weak physical side bonds are caused by the attraction of opposite electrical charges. Polypeptide chains that are coiled. Chemical bonds that connect amino acids end to end in long chains.
How do peptides join together to form proteins?These peptide subunits can form complex structures by bonding with other peptides. Chemical bonds of various types hold proteins together and bind them to other molecules. Examine the chemical bonds that are responsible for protein structure. A protein's primary structure is made up of amino acids linked together in a chain.
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O Macmillan Learning
A hydrate of cobalt(II) chloride had a mass of 238.0 g before heating. After heating, the anhydrous CoC1, weighed 130.7 g.
What is the mass of the water that was removed by heating?
mass of the water =
How many moles of water were removed by heating?
moles of the water =
How many moles of anhydrous CoCl, remain?
moles of CoCl₂ =
What is the hydration number (moles of water per mole of compound)?
hydration number=
mol
mol
A hydrate of cobalt(II) chloride had a mass of 238.0 g before heating. After heating, the anhydrous CoC1, weighed 130.7 g.
from above statement, we found that,
before heating cobalt(II) chloride = 238.0g
Mass of hydrated cobalt(II) chloride After heating = 130.7 g
Mass of water = (1238.0 - 130.7) g = 107.39g
moles H2O = 107.39× 1 mole H2O÷18g H2O
= 5.96 mol H2O.
moles of anhydrous CoCl, remain = given mass of CoCl÷ molar mass of CoCl
=130÷94.5
= 1.375 mole
moles of CoCl₂ = given mass of CoCl₂÷ molar mass of CoCl₂
= 130÷ 130
= 1 mole.
hydration number = moles of water÷ mole of compound
= 5.96 mol÷ 1
= 5.96 hydration number
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Describe how plants promote mechanical and chemical weathering but inhibit erosion.
Rocks are wedged apart by plant roots that grow through fissures in quest of water and minerals. Additionally, some fungus, lichens, and plants create acids and other substances that help the chemical weathering of earth minerals. Root systems restrain by adhering to and stabilizing rocks and soils.
How do plants promote mechanical and chemical weathering?
Chemical and mechanical weathering can be brought on by plants. Plants' roots penetrate rocks and cause them to fracture as a result of mechanical weathering. It may also occur on sidewalks or in streets. Plants produce chemical weathering by releasing acids or other chemicals through their roots onto rocks, causing the rocks to fracture and develop fissures.Chemical weathering is also brought on by animals and plants. Plant roots draw components from the minerals as they absorb nutrition. The rock undergoes a chemical alteration as a result.
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How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons?
About a century ago, in 1911, Rutherford discovered the atomic nucleus, then in 1919, he witnessed the proton.
For a long time, people believed that Atom was the final particle and the building block of every other component in the universe. However, in the year 1911, Rutherford's atomic model depicting the presence of nucleus shattered the argument that atom is the ultimate unbreakable particle.
Rutherford's experiment also approved that there must be more than just protons in the nucleus. For example, it was previously known that helium had an atomic number of 2, but a mass number of 4.
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A solution of iron (III) chloride has a density of 1.118 g/mL. What volume of solution would have a mass of 1.75 kg?
The volume of a solution of iron (III) chloride is 1565.29 mL when it has a density of 1.118 g/mL and a mass of 1.75 kg.
What is Density?Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.
In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.
According to the question,
The density of iron chloride solution = 1.118 g/mL.
The mass of iron chloride solution = 1.75 kg.= 1750 g.
The formula for calculating the density is as follows:
Density = mass/volumeVolume = mass/density.Volume = 1750 g/1.118g/mL = 1565.29 mL.
Therefore, the volume of a solution of iron (III) chloride is 1565.29 mL when it has a density of 1.118 g/mL and a mass of 1.75 kg.
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Earth is made mostly of metals and rocks. where did the elements (carbon, silicon, iron, etc.) that make up these materials form?
Earth is made mostly of metals and rocks. the elements (carbon, silicon, iron, etc.) that make up these materials form, and they were produced by nuclear fusion in stars.
Metals are materials that, when freshly worked, polished, or crushed, have a lustrous appearance and are relatively good conductors of electricity and heat. Metals are typically ductile and malleable. These properties are the result of metallic bonding between the atoms or molecules of the metal.
Metal is very useful material. Metals have many properties such as B. Strength, toughness, and stiffness. When heated, the metal can be shaped into anything from tiny paper clips to giant airplanes. It is also an excellent conductor of electricity and heat, making it useful for electricity and cooking pots.
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why is lightning categorized as plasma? A. It consists of tightly packed particles B. it has a definite volume. C. it has no definite shape D. it has extremely high levels of energy
Lightning is categorized as plasma because it has extremely high levels of energy.
When the electrons are freed from their host atoms for a short time, due to high temperatures, it is plasma. An electrical discharge consisting of moving electrons and ions, is lightning. Lightning strikes create plasma via a very strong jolt of electricity.
By the passage of electricity through a gas, the plasma was created. An electrical discharge through air and it ionizes the atoms when this happens. The electrons from the atoms strips and leaves positively charged ions in the gas, is lightning.
Lightning as an example of plasma present at Earth's surface. Plasma temperatures approaches 30000 K and electron densities may exceed 10²⁴ m−³.
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Why does a smaller atomic radius lead to higher electronegativity.Please explain conceptually
The electrons are more closely linked the closer they are to the nucleus, enhancing the atom's electronegativity.
The ability of an atom to polarise electron density in its own direction is measured by electronegativity. As a result, it is USUALLY a function of the nuclear charge's symbol, atomic number Z. The most electronegative elements are fluorine and oxygen, which are located to the right of the Periodic Table.
These elements have smaller atomic radii and greater electronegativity due to their higher atomic numbers. The distribution of electrons around an atom's nucleus determines its size, so it makes sense that there would be a link between electronegativity and radius. The electrons are more closely linked the closer they are to the nucleus, enhancing the atom's electronegativity.
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What type of bonds occurs between neighboring amino acids in a secondary structure in creating alpha helices and beta pleats?.
Hydrogen bonds occur between neighboring amino acids in a secondary structure in creating alpha helices and beta pleats.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
Protein is composed of amino acid linked with peptide bond, secundary structure can be α-helices and beta pleated sheet.
In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone.
Fluorine atom has greater electronegativity than oxygen atom in carbony group, so the hydrogen bond with hydrogen atom is shorter and strands are closer.
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Which molecule in each pair has the greater dipole moment? give the reason for your choice. a) so2 or so3
SO2 has a larger dipole moment than SO3 molecule in each pair has the greater dipole moment
Dipole moment (μ) measures the net molecular polarity, which is the product of charge Q and the distance r between the charges μ=Q×r thus, the larger the difference in electronegativities of bonded atoms, the larger the dipole moment. the SO3 molecule has zero dipole moment SO3 (sulfur trioxide) molecule has the highly symmetrical trigonal planar geometry and each one of the individual S-O bond in the species is equally polar. trigonal planar with each O double bonded to S. so no dipole moment inSO3.
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______ suspends lipids in the watery chyme in the small intestine so that lipids can be more easily digested by lipase enzymes.
Bile suspends lipids in the watery chyme in the small intestine so that lipids can be more easily digested by lipase enzymes.
Enzymes are proteins that accelerate metabolism and chemical reactions in the body. Build some substances and break down others. All living things have enzymes. Our bodies naturally produce enzymes. However, enzymes are also found in finished products and foods.
According to the International Union of Biochemists (I U B), enzymes are divided into six functional classes, classified according to the types of reactions used to catalyze them. The six enzymes are hydrolases, oxidoreductases, lyases, transferases, ligases, and isomerases.
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Which of the following correctly describes an oxidation-reduction reaction?
A.The element that is oxidized increases in electronegativity, and the element that is reduced decreases in electronegativity.
B.The element that is oxidized decreases in electronegativity, and the element that is reduced increases in electronegativity.
C.The element that is oxidized loses electrons, and the element that is reduced gains electrons.
D.The element that is oxidized gains electrons, and the element that is reduced loses electrons.
Answer:
C. The element that is oxidized loses electrons, and the element that is reduced gains electrons.
Explanation:
When an element is oxidized, it loses electrons. But when an element is reduced, it gains electrons. However, an oxidizing agent oxidizes something else, and gets reduced, therefore gaining electrons
Which compound would be most easily formulated as an aqueous solution used to quickly provide energy to an athlete?
The compound would be most easily formulated as an aqueous solution used to quickly provide energy to an athlete is carbohydrate.
carbohydrate strategy is used for athletes to maximize the storage of energy , in form of glycogen, in muscles. simple carbohydrates are simple sugar such as fructose and glucose.Every athletes anywhere should consume 3 - 12 gm per kilo weight throughout the day, depending on their training routine.
Carbohydrates provide energy for the body including muscles , brain, nerves and other tissues present in body.thus, carbohydrates acts a master fuel in body.
carbohydrates are used for energy (glucose). athlete drinks contain carbohydrates ans electrolytes.
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An element that has the electron configuration 1s22s22p 4 has how many electrons?
Electrons ruminate around the nucleus in particular circular path known as orbit called shell.
Electronic configuration is the dispense of electrons.
Electronic configuration is also known as electronic structure.
Also termed as spatial methodize.
More than one orbital in the electron shell is known as subshell, they have similar energy level.
In Electronic configuration there are four shell present namely k,l,m,n and there are 4 sub-shell namely s,p,d,f.
As we know that every subshell fills gradually s max 2 electrons p - 6 , d - 10 and f - 14.
So,
According to questions,
Thge element has configuration 1s2 2s2 2p4 hence 8 electrons.
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organized cells:tissues as organ system or organism
Explanation:
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
What are the approximate temperatures for southern great britain and northern newfoundland (white arrows)?
High temperature: 58 °F
Low Temperature: 43 °F
50 °F is the average temperature.
Precipitation: 3.12"
79% humidity
44 °F Dew Point
Wind speed: 9 mph
29.96 mmHg pressure "Hg
12-mile visibility
The average summer temperature on the island of Newfoundland is 16°C (61°F), while the winter temperature is around 0°C (32°F). The winter climate in Labrador is somewhat harsher, but temperatures can reach 25°C (77°F) during the short but pleasant summers.Southern Great BritainGreat Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. It is the largest of the British Isles, the largest European island, and the ninth-largest island in the world, with a total area of 209,331 km (80,823 sq mi). It is characterized by a maritime climate with a narrow temperature range.
Northern NewfoundlandNorthern Bay has about 290 permanent residents and is located on Route 70 between the neighboring communities of Gull Island and Ochre Pit Cove. It stretches from the "south side" of Northern Bay, where the beach is, to what was once known as the "Lower Rooms."
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Anunknown carbon sample (z = 6) was found to contain two isotopes 12c and 14c, and measured to have an atomic mass of 12.8 amu, what is the fraction of 12c in the sample?
The fraction of 12c in the sample is 60% or 0.6
What are Isoptes?Isotopes are two or more different atom types that share the same atomic number and are placed in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers. Or, any of two or more types of atoms of a chemical element that have the same atomic number and essentially the same chemical behavior, but have distinct atomic masses or mass numbers and different physical properties. Isotopes are atoms that are part of the same element and have the same atomic number Z but a different mass number A. For instance, three isotopes of the element carbon, with respective masses of 12, 13, and 14, are carbon-12, carbon-13, and carbon-14.
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