Answer:5
Explanation:
5
Copper, sulfur, gold, iron, and aluminum are elements, as their symbols suggest. The other four substances are compound with two elements each.
How do you know if a reaction is exothermic? Enter your answer in the space provided
what is true about the about the structure or function of the plasma membrane
A. large molecules often cross the plasma membrane while inside vesicles
B. Hydrophobic molecules keep the cell from getting too much water
C. The bilayer structure forms a solid boundery that seperates the cell from its enviornment.
D. its made entirely of intregral protiens.
Which of these is an example of a physical change -baking a cake -toasting bread -grinding pepper -lighting up a grill
An example of a physical change is grinding pepper. Physical change is when there is no change in the chemical composition of the substance.
What are physical changes?Physical changes are those changes in which the physical composition of the substance changes but the chemical composition of the substance or compound remains the same.
Examples are ice melting into water. It is a physical change. Like here, the baking cake is a chemical change in which the substance changes into other substances.
And grill lighting is a chemical change. Toasting bread is a chemical change in which the bread substance is burning. Pepper grinding is a process of physical change because it's just crushing the pepper.
Therefore, an example of physical change is grinding pepper.
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How many atom of cd are in 3.00g of cadmium
You must first convert the supplied value to moles because the molar mass of cadmium is 112.41 grams. Divide 3 grams by the molar mass of 112.41 grams to accomplish that. Consequently, there are 1.601022 cadmium atoms in a 3.00 gram of cadmium.
What is the best way to find number of atom in an element?Using the periodic chart, calculate the element's molar mass. Divide the given mass in grams by the molar mass to get the number of moles.
Multiply the number of moles by Avogadro's number to obtain the total number of atoms.
The amount of units in one mole of any substance is known as Avogadro's number, and it is equal to 6.02214076 1023.
Depending on the substance and the nature of the reaction, the units may be electrons, atoms, ions, or molecules (if any).
Therefore, 3.00g of cadmium contain 1.60×1022 atoms.
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To find the number of atoms of cadmium in 3.00 grams, divide the mass by the molar mass of cadmium to get moles and then multiply by Avogadro's number. The calculation reveals there are approximately 1.61 x 10²² atoms of Cd in 3.00 grams.
To determine how many atoms of cadmium (Cd) are in 3.00 grams of cadmium, we use Avogadro's number and the molar mass of cadmium. The first step is to find the number of moles of cadmium in 3.00 grams.
Calculate the number of moles of cadmium: Number of moles = mass (in grams) / molar mass (in grams per mole). The molar mass of cadmium is approximately 112.411 g/mol.
Multiply the number of moles by Avogadro's number (6.022 x 10²³ atoms/mol) to obtain the number of atoms.
Here's the calculation:
Number of moles = 3.00 g / 112.411 g/mol = 0.0267 mol
Number of atoms = 0.0267 mol x 6.022 x 10²³ atoms/mol = 1.61 x 10²² atoms of Cd
Which of the statements correctly describes the reactivity of halogens, according to the octet rule?
They have two electrons in their valence shell, so halogens are very unreactive. They have seven electrons in their valence shell, so halogens are very unreactive. They have seven electrons in their valence shell, so halogens are very reactive. They have two electrons in their valence shell, so halogens are very reactive.
Answer:
They have seven electrons in their valence shell, so halogens are very reactive.
Explanation:
The halogens are the elements of the group 17 (or 7A) of the periodic table, all the elements have the valence shell [tex]s^{2}p^{5}[/tex], so they have 7 electrons in their valence shell.
These elements need only one electron to be stable according to the octet rule, so they are very reactive, they can react with metals, non-metals, hydrogen and with themselves.
What is the mass of 3.25 moles of fluorine which has a molar mass of 18.998 g per mole
Explain how the temperature of a substance is related to the kinetic energy of its molecules.
When an article is in motion then the measure of energy stored in it is called kinetic energy.
Kinetic energy is required to speed up the body of the given mass so that it moves from the resting state. It is present only when the object is moving.The kinetic energy of the object can be calculated by the unit Joules and by the formula:[tex]\text{Kinetic}\; \text{Energy} &= \dfrac{1}{2}\; \text{mv}^{2}[/tex]
where, m = mass of the article in kg
v = velocity in [tex]\dfrac{\text{meter}}{\text{seconds}}[/tex]
The temperature of any object is relevant to the kinetic energy that the object possesses.When the temperature of an object is increased some of the temperatures gets consumed in the form of energy while the remaining energy is used in increasing the movement of the object.
Therefore, the kinetic energy is directly proportional to the temperature.
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What is an organ that absorbs water and vitamin K from digested food
The organ that absorbs water and vitamin K from digested food is the small intestine.
The small intestine is a long, coiled tube that is located in the abdomen. It is responsible for the absorption of nutrients from digested food. The small intestine is divided into three parts: the duodenum, the jejunum, and the ileum.
The duodenum is the first part of the small intestine. It is about 10 inches long and is located just below the stomach. The duodenum is where most of the digestion of food takes place. The jejunum is the middle part of the small intestine. It is about 8 feet long and is where most of the absorption of nutrients takes place. The ileum is the last part of the small intestine. It is about 12 feet long and is where the remaining nutrients are absorbed.
Water and vitamin K are both absorbed in the small intestine. Water is absorbed throughout the small intestine, but it is absorbed more rapidly in the jejunum. Vitamin K is absorbed in the ileum.
Other nutrients that are absorbed in the small intestine include carbohydrates, proteins, fats, minerals, and vitamins. The small intestine is a very important organ for digestion and absorption of nutrients.
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Which statement contrasts the two types of mixtures? A. A heterogeneous mixture has a uniform composition, whereas a homogeneous mixture has visually distinguishable parts. B. A heterogeneous mixture has visually identifiable parts, whereas a homogeneous mixture has a uniform composition. C. A solution is composed of a fixed ratio of elements forming a compound, and a heterogeneous mixture has a uniform composition. D. A solution contains a solute and a solvent, whereas a heterogeneous mixture contains a mixture of solvents.
How reactive is an atom of Sodium(Na) and why?
Question 1 options:
Sodium (Na) is very reactive because it does not have a full valence shell.
Sodium (Na) is very reactive because it does not have enough protons in the nucleus.
Sodium (Na) is not very reactive because it does not have a full valence shell.
Sodium (Na) is not very reactive because it can only bond with Chlorine (Cl) to become salt.
PLz plz plz plz help
true or false there are more electrons than protons and negatively charged atom
The explosions that take place during a fireworks show are an example of which of the following?Image of fireworks exploding in air
Chemical change
Chemical property
Physical change
Physical property
Answer:
Chemical change
Explanation:
A chemical change is a change that cannot be reversed. It results in the formation of a new product. For example, the combustion of wood gives carbon dioxide and water and sometimes suit. In other words, in a chemical change, the products are always different from the reactants. The following equation generally governs a chemical change:
[tex]Reactants = Products (solid, liquid, or gas)[/tex]
Which state of matter does this image represent? Image of lightning Solid Liquid Gas Plasma
balance the combustion eqation; __C5H + __O2 ---> __CO2+__H2O
how is the growth of a living thing different from the growth of a nonliving thing
Growth is a permanent and Irreversible increase in the size of a living organism. In Living organisms, growth is from Inside. Where as in Non-living objects like Mountains and sand mounds, growth occurs by accumulation on of material on the outer surface.
What is Growth ?Growth is the increase in mass and size of a body or organs which typically occurs by the multiplication of cells and an increase in intracellular substance.
Development means the physiological and functional maturation of the organism.
Living organisms undergoes growth from Inside. Where as Non-living objects like Mountains and sand mounds undergo growth by accumulation on or of material on the outer surface.
Therefore, Growth is a permanent and Irreversible increase in the size of a living organism.Where as in Non-living objects like Mountains and sand mounds, growth occurs by accumulation on of material on the outer surface.
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Which term is described as a flat expanse of ocean floor
the answer is guyots
Is Ca + O --> CaO a balanced chemical equation? Is it obeying the law of conservation of matter? Question 5 options: Yes it is balanced. It has the same number of Ca and O on both the reactant side and the product side. No it is not balanced. It has more Ca on the product side than the reactant side. No it is not balanced it has more O on the reactant side than the product side.
Answer is: Yes it is balanced. It has the same number of Ca and O on both the reactant side and the product side.
According to principle of mass conservation, number of atoms must be equal on both side of chemical reaction.
There is one calcium atom atom and one oxygen atom on both side of reaction, so chemical reaction is balanced.
There are more protons than electrons in a negatively charged atom.true or false. it is false, pretty sure
Answer: false
Explanation:
I got it right
Relate the statement “You can’t get something for nothing” to the law of the conservation of mass.
Which of the following explains why metals are able to be pounded, extruded, bent, and shaped without breaking?
The reason the metals are malleable, is because they have mobile electrons in their s orbitals.
The ions create a lattice-like structure held together by the metallic connections. Metallic bonds are what allow metals to flex without breaking and conduct electricity.
What is metallic bond ?Chemical bonds known as metallic bonds are produced by the electrostatic attraction of positively charged metal ions and conduction electrons. The sharing of free electrons among a structure of positively charged ions could be used to characterize it.
Metal atoms form metallic connections. Ionic bonds link metals to non-metals, whereas metallic bonds link many metal atoms. Metallic bonding can be observed in action on copper wires and sheets of aluminum foil.
When the charge is dispersed over a broader area than the size of a single atom in a solid, metallic bonds are created. Most left-handed elements in the periodic table form metallic bonds.
Thus, Metallic bonds are what allow metals to flex without breaking and conduct electricity.
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As you travel from a solid to a gas, energy is being absorbed or given off?
This is a type of element that has many valence electrons, not a conductor.
The type of elements that have many valence electrons and are not good conductors are called nonmetals. They are known for their hard and brittle nature with high to very high melting points. While they can conduct electricity as a liquid, in solid state they are poor conductors.
Explanation:The elements referred to in the question are called nonmetals. These elements, which are often found on the right side of the periodic table, have many valence electrons and are poor conductors of electricity. Some examples of nonmetals include nitrogen, oxygen, and the noble gases.
Nonmetals have various physical and chemical properties that distinguish them from metals. For instance, they are usually hard and brittle, and can conduct electricity as a liquid but not as a solid. Additionally, nonmetals have high to very high melting points. All these features are due to their electrons being more tightly bound to their nuclei than in metals.
Another category closely related to nonmetals are the metalloids, like boron, silicon, germanium, arsenic, antimony, and tellurium. These elements exhibit properties of both metals and nonmetals. Although they may appear metallic, they do not conduct electricity as well as metals and hence can be considered as semiconductors. Their chemical behavior also falls between that of metals and nonmetals.
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which is the most accurate description of metals a. dull and brittle b. non reactive gases C. liquid at room temperature d. good conductors of electricity
The correct answer is option (d). The most accurate description of metals are good conductors of electricity.
Metals are generally known for their ability to conduct electricity efficiently. This is due to the presence of free electrons in their structure, which can move easily through the metal, carrying electrical current.
Option a, dull and brittle, does not accurately describe metals. While some metals can be brittle, many are ductile and malleable. Additionally, metals can have a shiny appearance, which contradicts dull.Option b, non reactive gases, is incorrect because metals are not gases, and many metals are known for their reactivity, especially with acids and oxygen, leading to oxidation or corrosion.Option c, liquid at room temperature, is also incorrect because most metals are solids at room temperature, with mercury being a notable exception as it is a liquid at room temperature.A farmer wants to determine if a new fertilizer gives a better crop yeild than her old fertilizer. she spreads the old fertilizer in field A, which crop had a brand new irrigation system. she spreads the new fertilizer in field B, which has a irrigation system that will be repaired next season. at the end of growing season, field A has a better yeild. the farmer determines that her old fertilizer is the better fertilizer. this an example of which of the following A. cultural bias B. personal bias C. data presentation error D. experimental bias
Answer: D. experimental bias
Explanation:
An experimental bias is the condition in which the experimenter manipulate the experimental procedure, equipment and even the results so as to obtain the desired outcome.
The given situation is an example of experimental bias this is because of the fact that field A was supplied with old fertilizers and brand new irrigation system but field B was supplied with new fertilizers and irrigation system which will be repaired in next season. Hence, a experimental bias is done so as to show that the old fertilizer is better than the new one.
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Which describes interactions between substances and stomata during photosynthesis? Check all that apply.
Oxygen enters stomata.
Oxygen is released through stomata.
Carbon dioxide enters stomata.
Carbon dioxide is released through stomata.
Hydrogen enters stomata.
Hydrogen is released through stomata.
Carbon dioxide enters the stomata and Oxygen is released through the stomata during photosynthesis.
What is photosynthesis?Photosynthesis is the process that takes place in plants through photosynthetic pigments such as chlorophyll. All green plants utilize photosynthesis to produce nutrients by using water, carbon dioxide, and sunlight. The side product of the photosynthesis process in plants is oxygen.
The photosynthesis process is also used by algae to change solar energy into chemical energy. Photosynthesis takes place when plants use sunlight to convert carbon dioxide and water into glucose and oxygen.
There are a large number of tiny pores on the surface of the leaves of plants known as stomata. The carbon dioxide (CO₂) enters the leaves of the plant through the stomata and oxygen leaves through the stomata present on the surface of the leave.
Therefore, options (B) and (C) are correct to describe interactions between substances and stomata.
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Which scenario suggests that the results of an experiment are reliable?
A. The hypothesis is supported by the results.
B. Repeating the experiment gives the same results.
C. The results are posted on many websites.
D. New questions come up because of the results.
Density is an intensive property in that increasing the amount of a substance _________ increase its density.
Density is the mass-to-volume ratio of a substance and is an intensive property, meaning it does not change when the amount of substance is increased.
Explanation:The density (d) of a substance is an intensive property that is defined as the ratio of its mass (m) to its volume (V). Density is an important characteristic of substances and plays a critical role in phenomena such as whether an object will sink or float in a fluid.
Increasing the amount of a substance does not increase its density because density is proportional to the mass and volume of a substance. Since both mass and volume are extensive properties (meaning they depend on the amount of the substance), when they are increased proportionally, their ratio, which is density, remains constant. Thus, the density of a substance is independent of the amount of substance present at a given temperature and pressure.
Final answer:
The density of a substance, a ratio of mass to volume, remains constant irrespective of the amount, making it an intensive property.
Explanation:
Density is an intensive property of a substance, which means it is characteristic of the substance itself and does not depend on the amount of the substance present. The density (d) of a substance is defined as the mass (m) of the substance divided by its volume (V).
Even though mass and volume are extensive properties (they depend on the amount of substance), the reason their ratio (density) is an intensive property is that it remains constant for a substance regardless of how much of it you have. This ratio measures how much mass exists in a given unit volume and, at a given temperature and pressure, this value does not change, no matter the sample size.
This distinction is important in physics and engineering, as density plays a critical role in determining whether an object will sink or float in a fluid, among other applications.
Determine the electronegativity difference between the probable bond type and the more electronegative atom with respect to bonds formed between the pairs of atoms Se and S
Final answer:
The electronegativity difference between selenium (Se) and sulfur (S) is 0.03, indicating a nonpolar covalent bond. Sulfur (S) is slightly more electronegative than selenium (Se).
Explanation:
To determine the electronegativity difference and predict the bond type between selenium (Se) and sulfur (S), we need to look at their individual electronegativities. Typically, Se has an electronegativity of about 2.55 and S has an electronegativity value of about 2.58. To find the electronegativity difference (AEN) for a bond between Se and S, we subtract these values:
[tex]AEN = X_{S} - X_{Se}[/tex]
= 2.58 - 2.55 = 0.03
Since this difference is very small, the Se-S bond would be classified as nonpolar covalent. The more electronegative atom in this pair is sulfur (S), but because the difference is so minor, there would be little to no polarity in the bond, and both atoms would share the bonding electrons approximately equally.
Final answer:
The electronegativity difference between Se and S is 0.03, indicating a nonpolar covalent bond with Sulfur being slightly more electronegative.
Explanation:
The question asks to determine the electronegativity difference and probable bond type, focusing on a bond between Se and S atoms. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. To estimate the character of the bond as ionic or covalent, we can calculate the difference in electronegativity between Se and S. The electronegativity of Se (Selenium) is about 2.55, and the electronegativity of S (Sulfur) is about 2.58. The difference is 2.58 - 2.55 = 0.03.
This small difference indicates that the bond between Se and S would be nonpolar covalent as the difference in electronegativity is very small. Additionally, since Sulfur is slightly more electronegative than Selenium, it would be the more electronegative atom in this bond. For example, a C-H bond with an electronegativity difference of 0.4 is considered nonpolar covalent, showing that the Se-S bond, with an even smaller difference, is also nonpolar covalent.
if your sample contained a volatile impurity what value would be in error, the mass of the anhydrous salt or the mass of the water?
The presence of a volatile impurity would cause the calculated mass of anhydrous salt to be too low, as the impurity would evaporate along with water, leading to an overestimation of the mass of water lost.
Explanation:If a sample contains a volatile impurity, the value that would be in error is the mass of the anhydrous salt. When heating a hydrated salt to drive off water and obtain the mass of the anhydrous salt, the presence of a volatile impurity means that along with the water, the impurity could also evaporate. This would lead to a recorded mass that is less than the actual mass of the anhydrous salt. So, the calculated mass of anhydrous salt would be too low, and conversely, the mass of water recorded would be too high because the loss of mass of the volatile impurity would be erroneously attributed to the water mass.
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