What mass in grams of ethylene oxide is needed to react with 18 g of water?
Define monosaccharide disaccharide and polysaccharide give at least two examples of each. which of these is the
Monosaccharides, disaccharides, and polysaccharides are types of carbohydrates that consist of one, two, and many sugar molecules, respectively. Glucose and fructose are monosaccharides, sucrose and lactose are disaccharides, and starch and cellulose are polysaccharides.
Explanation:Monosaccharides are the simplest form of carbohydrates and consist of one sugar molecule. Examples include glucose and fructose. Disaccharides consist of two monosaccharide molecules bonded together. Sucrose (table sugar) and lactose (milk sugar) are examples of disaccharides. Polysaccharides are complex carbohydrates made up of many monosaccharides linked together. Starch and cellulose are examples of polysaccharides.
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What elemental trend exists as we move down a column on the periodic table?
Chemical reactivity of metals increases
Chemical reactivity of nonmetals increases
Chemical reactivity of metals remains unchanged
Chemical reactivity of nonmetals remains unchanged
Answer: The correct answer is chemical reactivity of metals increases.
Explanation:
Chemical reactivity is defined as the tendency of an element to loose of gain electrons.
Metals are the elements which looses electrons and hence, their chemical reactivity will be the tendency to loose electrons. Their chemical reactivity increases as we move from top to bottom in a group. This is so because, the electron get added up in the new shell. So, the electron in the outermost orbital gets far away from the nucleus. And hence, this will be lost easily. Thus, the chemical reactivity gets increases.
Non-metals are the elements which gains electrons and hence, their chemical reactivity will be the tendency to loose electrons. Their chemical reactivity decreases as we move from top to bottom in a group. As, the electrons get added up in the new shell. So, the the electron in the outermost orbital gets far away from the nucleus. And hence, the electron will be difficult to gain. Thus, the chemical reactivity of non-metals decreases.
Hence, the correct answer is chemical reactivity of metals increases.
The atomic number of sodium (na) is 11. how many electrons does a na atom have in its' valence shell?
a. 1
b. 2
c. 4
d. 8
what are the advantages of wind power?
If you had a sample of beryllium, would all of the atoms be identical. what about a sample of carbon
Final answer:
Atoms of an element are identical in atomic structure but can include different isotopes. Samples of beryllium and carbon can contain isotopes, but most atoms will be of the most common isotope. The presence of atoms with a mass number greater than 12 in a carbon sample indicates isotopes like carbon-13 or carbon-14.
Explanation:
If you have a sample of beryllium, the atoms within that sample would be identical in terms of their atomic structure, meaning each atom has the same number of protons, neutrons, and electrons. However, any sample of an element, including beryllium and carbon, can contain different isotopes, which means there can be atoms with different numbers of neutrons. For example, the most prevalent isotope of carbon is carbon-12, with 6 protons and 6 neutrons. In addition to carbon-12, we also find carbon-13, with an extra neutron, and carbon-14, with two extra neutrons.
When you analyze a sample of carbon and find that 6% of the atoms have a mass number greater than 12, you can conclude that 6% of the sample is comprised of carbon isotopes. This means the vast majority (94%) of your sample is carbon-12, the normal atomic mass of carbon, while the remaining part consists of isotopes like carbon-13 and the radioactive carbon-14. Carbon-14 is used in radiocarbon dating, a tool for archaeological studies.
A chemist is looking at an electrically neutral atom that has three valence electrons. If she knows the element is a metalloid, which one (or ones) is it?
The nucleus of an atom is dense and positively charged. What was observed when positively charged particles were radiated onto a gold atom during Rutherford's experiment because of this?
Negative charges were concentrated at the center of the atom.
Particles that struck the center of the atom were repelled.
Particles that struck the edges of the atom were repelled.
Positive charges were distributed all over the atom.
Answer:
Particles that struck the center of the atom were repelled.
Explanation:
In 1911, New Zealand physicist Ernest Rutherford carried out an experiment in order to deepen his knowledge of the atomic model hitherto adopted, which was that of Thomson; in which the atom would be a sphere of positive, non-massive electrical charge, encrusted with (negative) electrons, so that its total electrical charge would be zero.
To carry out such an experiment he bombed a very thin gold leaf (thickness of approximately 10-4 mm), through a beam of alpha particles (α), coming from a sample of polonium. The polonium was inside a lead block, with an orifice, through which only the emissions of alpha particles would be allowed out.
In addition, lead plates with holes were placed in their centers, which would orient the beam towards the gold blade. And, finally, a bulkhead covered with zinc sulfide, which is a fluorescent substance, was placed behind the slide, where it was possible to visualize the path taken by the alpha particles.
At the end of this experiment, Rutherford noticed that most of the alpha particles passed through the slide, did not deflect or retreat. Some alpha particles deflected, and very few receded. In addition, the particles that reached the center of the atom were repelled.
Based on these data, Rutherford concluded that, contrary to what Dalton thought, the atom could not be massive. But in reality, much of the atom would be empty and it would contain a very small, dense and positive nucleus.
explain why carbon-14 and nitrogen-14 are not considered isotopes.
Taking into account the definition of isotopes, carbon-14 and nitrogen-14 are not considered isotopes because they have have different atomic numbers.
First of all, all atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).
On the other side, the mass number tells us the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:
Mass number = (number of protons) + (number of neutrons)
Then, atomic number is defined as the number of protons or number in the atomic nucleus.
The same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
In this case, the elements carbon and nitrogen have different atomic numbers (this is different numbers of protons), and the same mass number. So, carbon-14 and nitrogen-14 are not considered isotopes.
In summary, carbon-14 and nitrogen-14 are not considered isotopes because they have have different atomic numbers.
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Atomic Number: 3
1s:
2s:
2p:
3s:
3p:
4s:
3d:
4p:
5s:
Answer: The configuration of lithium element is [tex]1s^22s^12p^03s^03p^04s^03d^04p^05s^0[/tex]
Explanation:
Electronic configuration is defined as the representation of electrons around the nucleus of an atom.
Number of electrons in an atom is determined by the atomic number of that atom.
We are given:
Atomic number = 3
The element having atomic number '3' is lithium
The electronic configuration of lithium element is [tex]1s^22s^1[/tex]
Hence, the configuration of lithium element is [tex]1s^22s^12p^03s^03p^04s^03d^04p^05s^0[/tex]
it all adds up worksheet
Which is generally true of enzymes in cells?
A) Enzymes allow reactions to proceed at body temperature.
B) Enzymes require co-enzymes to be effective.
C) Enzymes are organic compounds that the body needs in small amounts.
What 3 things can molecules moving with kinetic energy do?
Explanation:
Kinetic energy is defined as the energy obtained by the molecules of a substance because of their motion.
Hence, when a substance or object is moving from its initial position then it means it has some amount of kinetic energy.
So, if molecules are moving then they have possessed kinetic energy and 3 things these molecules will do are as follows.
They will collide with the walls of a container or object in which they are placed.Also, molecules tend to collide with each other.And, they are able to pass or move through a pore.the idea that light can act as packets led to what new field of science
The idea that light can act as packets led to the discovery of Quantum mechanics. The correct option is A.
What is quantum mechanics?Quantum mechanics is a field of science that deals with the behavior of light and matter. It explains the properties of matter. The electron, proton, and neutron constituency of a matter.
Light has dual nature, which means it can act like both waves and particles. Light is made up of particles that are called photons. Light can also act as quanta or packets, which revealed a new theory, quantum mechanics.
Quantum mechanics help in the field of many inventions, alike circuits, and lasers. Einstein never believed in the theory of quantum mechanics.
Thus, the correct option is A. Quantum mechanics.
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The question is incomplete. Your most probably complete question is given below:
A. Quantum mechanics
B. Nuclear mechanics
C. Electrical mechanics
D. Physical mechanics
which element belongs to the alkali metal family
The Alkali metals includes
Lithium, Sodium Potassium Rubidium CaesiumFrancium. What are alkali metal?
The alkali metals are the metal which react with water forms alkalies that is strong bases capable of neutralizing acids.
The alkali metals have the high thermal and electrical conductivity, lustre, ductility, and malleability all are the characteristic of metals. Each alkali metal atom contains a single electron in its outermost shell. This valence electron is much more weakly bound than those in inner shells.
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Write chemical equation for second step of a born - haber cycle. bai2
Answer:
The second step is the atomization (sublimation) of Ba
Ba(s) → Ba(g)
Explanation:
The Born Haber cycle allows one to determine the lattice energy of an ionic solid. Lattice energy or lattice enthalpy is the enthalpy change when 1 mole of an ionic solid is formed from its gaseous ions.
In the given example of BaI2 the corresponding steps as per the Born Haber cycle would be:
Step 1) Enthalpy of Formation of BaI2
Ba(s) + I2(s) → BaI2 (s)
Step 2) Atomization of Ba
Ba(s) → Ba(g)
Step 3) Atomization of I2
I2(s) → I2(g)
Step4) IOnization of Ba(g)
Ba(g) → Ba2+(g) + 2e-
Step 5) Electron affinity of I2
I2(g) + 2e- → 2I-(g)
Step 4) Lattice energy of BaI2
Ba2+ (g) + 2I-(g) → BaI2
Which of the following shows the path followed by nerve impulses in a reflex?
A.motor neurons → interneurons in brain → sensory neurons
B.sensory neurons → interneurons in brain → motor neurons
C.motor neurons → interneurons in spinal cord → sensory neurons
D.sensory neurons → interneurons in spinal cord → motor neurons
Sensory neurons, interneurons in spinal cord, motor neurons shows the path followed by nerve impulses in a reflex. Sensory neurons are the neurons that carry information from the environment externally to the central nervous system (CNS) mainly brain and motor neurons are those which carry information from CNS to other parts.
A human perceives something then by sensory neurons the information goes to CNS and that information is further passed by interneurons in spinal cord and is further passed by motor neurons from CNS to other parts to perform stimulus of perception.
The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 x 1014 Hz. What is the energy associated with this frequency?
Answer: The energy associated with blue light is [tex]49.65\times 10^{-20}J[/tex]
Explanation:
To calculate the energy of the light for a given frequency, we use the equation given by Planck, which is:
[tex]E=h\nu[/tex]
where,
E = energy of the light
h = Planck's constant = [tex]6.62\times 10^{-34}Js[/tex]
[tex]\nu[/tex] = frequency of the light = [tex]7.5\times 10^{14}s^{-1}[/tex]
Putting values in above equation, we get:
[tex]E=6.62\times 10^{-34}Js\times 7.5\times 10^{14}s^{-1}=49.65\times 10^{-20}J[/tex]
Hence, the energy associated with blue light is [tex]49.65\times 10^{-20}J[/tex]
[tex]\rm 49.65 \times 10^-^2^0\;J[/tex] is the energy associated with the frequency.
What is the frequency?The number of times a repeated event occurs per unit of time is known as frequency.
The frequency of the blue light is 7.5 x 1014 Hz
To calculate the energy of the light, we will use plank's equation
[tex]\rm E = hv[/tex]
Where E = energy
[tex]\rm Plank's \;constant = 6.62 \times 10^-^3^4 Js\\\\ Frequency \;of \;the\;light\;v = 7.5 \times 10^-^1^4 s^-^1[/tex]
Putting the values
[tex]\rm E =6.62 \times 10^-^3^4 \times 7.5 \times 10^-^1^4 = 49.65 \times 10^-^2^0\;J[/tex]
Thus, the energy associated with this frequency is [tex]\rm 49.65 \times 10^-^2^0\;J[/tex]
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When a fluorine atom reacts with a chlorine atom, the bond that forms between them should be
ionic covalent.
nonpolar covalent.
ionic.
polar covalent.
Answer: Polar covalent
Explanation:
If another scientist tests the substance using iodine, which macromolecule is the scientist testing for? question 27 options: carbohydrate lipid protein
What are two methods of writing a balanced formula?
The two methods used to balance a chemical equation are :
(a) Inspection method.
(b) Algebraic method.
Methods to balance a chemical equationA chemical equation must satisfy the rules of conservation of mass and constant proportions.The rules state that the reactant and product sides of the formula must have the same amount of atoms of each element, the balancing technique is important.(A) Inspection method – In this method, we examine the equation and find the right balance.
Example- [tex]NaCl + BeF_2 = NaF + BeCl_2[/tex]In the above equation, the quantity of chlorine is not the same on both sides. In the product, there are two molecules of chlorine and in the reactant, there is only one. So to balance it, we will put 2 in the reactant.[tex]2NaCl + BeF_2 = NaF + BeCl_2[/tex]
Now, the quantity of nitrogen is two in the reactants but only one in the product. So we put 2 in front of the NaF in the product.[tex]2NaCl + BeF_2 = 2NaF + BeCl_2[/tex].
Now it is balanced.(B) Algebraic method
This approach of balancing chemical equations includes assigning algebraic variables to each species in the imbalanced chemical equation as stoichiometric coefficients.Thus, these are the two methods of balancing a chemical equation.
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How much work (in j) is involved in a chemical reaction if the volume decreases from 5.00 to 1.26 l against a constant pressure of 0.857 atm?
The work done in the chemical reaction is 3.20 J.
Explanation:The work done in a chemical reaction can be calculated using the formula:
Work (W) = -P ∆V
Where P is the pressure and ∆V is the change in volume. In this case, the volume decreases from 5.00 to 1.26 L against a constant pressure of 0.857 atm. To calculate the work, we need to calculate the change in volume:
∆V = Vfinal - Vinitial = 1.26 L - 5.00 L = -3.74 L
Substituting the values into the formula, we have:
Work (W) = -P ∆V = -(0.857 atm) (-3.74 L) = 3.20 J
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The work done in the chemical reaction can be calculated using the formula W = P∆V, which gives the result as 292.1 Joules.
Explanation:Work done, especially in a process involving a gas, can be calculated when the pressure is constant and the volume changes. This is often referred to as pressure-volume work. In this particular case, we are given a process in a chemical reaction where the volume decreases from 5.00 to 1.26 L (a decrease of 3.74 L or 3.74 x 10^-3 m^3) against a constant pressure of 0.857 atm (which equals 0.857 x 1.01325 x 10^5 N/m^2). The formula to calculate work done is W = P∆V.
Inserting the given values into the formula, W = 0.857 x 1.01325 x 10^5 N/m^2 x 3.74 x 10^-3 m^3 which equals approximately 292.1 J (joules). Therefore the work involved in the chemical reaction is 292.1 J.
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Balance the equation and write the reaction-quotient expression, qc. u(s) + f2(g) ----> uf6(g)
The balanced equation with the reaction-quotient expression is;
U(s) + 3F₂(g) → UF₆(g)
Further Explanation:Chemical equations Chemical equations are equations showing reactions between reactants to form products. Chemical equations show the reactants or starting substances and products or substances formed during the reaction.Law of conservation of mass The law of conservation requires that when writing chemical equations, the mass of the reactants should be equal; to the mass of the products.This is done by making sure the number of atoms of each element involved in the chemical equation is equal on both sides of the equation.To ensure the law of conservation in chemical equations is observed we balance chemical equations.Balancing chemical equation:Balancing chemical equations is a try and error method that ensures the number of atoms in the side of the reactants is equal to the number of atoms in the side of products.Balancing chemical equations may also require inclusion of state symbols which shows the state of each compound or element involved in the chemical reactions.For example; the equation; U(s) + 3F₂(g) → UF₆(g) is balanced as the number of Uranium and Fluoride atoms are equal on both sides of the equation.Keywords: Chemical equations, balancing of chemical equations
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Subject: Chemistry
Topic: Chemical equations
Sub-topic: Balancing chemical equations
The balanced chemical equation is U(s) + [tex]3F_2[/tex](g) → [tex]UF_6[/tex](g), and the reaction-quotient expression is Qc = [[tex]UF_6[/tex]] /[tex][F_2]^3[/tex].
To balance the chemical reaction and write the reaction-quotient expression (Qc) for the equation U(s) + [tex]F_2[/tex] (g) → [tex]UF_6[/tex] (g), let's follow these steps:
Step 1: Balance the Chemical Equation
The unbalanced equation is:U(s) + [tex]F_2[/tex] (g) → [tex]UF_6[/tex] (g)
Notice that there are six fluorine atoms in the product (UF6) but only two in the reactant ([tex]F_2[/tex]). Therefore, we need 3 molecules of [tex]F_2[/tex] to balance the fluorine atoms:U(s) + [tex]3F_2[/tex] (g) → [tex]UF_6[/tex] (g)
Now the equation is balanced.Step 2: Write the Reaction-Quotient Expression, Qc
The reaction-quotient expression (Qc) is a ratio of the concentrations of the products to the reactants, each raised to the power of their coefficients in the balanced chemical equation. For the reaction U(s) + [tex]3F_2[/tex](g) → [tex]UF_6[/tex](g), the expression is:Qc = [[tex]UF_6[/tex]] / [tex][F_2]^3[/tex]
Since U is a solid, it is not included in the Qc expression.ConclusionAfter balancing the equation, U(s) + [tex]3F_2[/tex](g) → [tex]UF_6[/tex](g), the reaction-quotient expression is Qc = [[tex]UF_6[/tex]] / [tex][F_2]^3[/tex]. This helps assess the direction of the reaction to reach equilibrium in a given system.
What does the space-filling model of a water molecule tell you about the relative size of the atoms?
What are valence shell electrons
What is the difference between saturated and unsaturated fats answers?
what is the name and the chemical symbol for the gas that caused the professor's voice to change - from the movie flubber
Answer:
Helium gas, symbol He
Explanation:
The gas that causes voice to change upon inhalation is helium which belongs to the inert gas/noble gas series in the periodic table. The chemical symbol is He.
When He gas is inhaled it fills up the vocal tract and replaces some of the air present in the cavity. Now, the density of He is much lower than that of air as a result the speed of sound as it passes through the vocal cavity increases which leads to a change in voice.
Gymnasts often practice on foam floors, which increase the collision time when a gymnast falls. What effect does this have on collisions?
The change in momentum needed to stop the gymnast is increased.
The change in momentum needed to stop the gymnast is decreased.
The force exerted by the floor on the gymnast decreases.
The force exerted by the floor on the gymnast increases.
Answer:
The answer in b
Explanation:
Because if she falls the momentum pushes him/her.
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A syringe contains 0.65 moles of he gas that occupy 750.0 ml. what volume (in l) of gas will the syringe hold if 0.35 moles of ne is added? a syringe contains 0.65 moles of he gas that occupy 750.0 ml. what volume (in l) of gas will the syringe hold if 0.35 moles of ne is added? 1.9 l 4.9 l 2.1 l 0.87 l 1.2 l
Answer:
The correct answer from the given options is option 1.2 L.
Explanation:
Volume of the gases when 0.65 moles of gas are present = [tex]V_1=750 mL=0.750 L[/tex]
Volume of the gas when there 0.35 moles of gas are added= [tex]V_2[/tex]
[tex]n_1=0.65 moles,n_2=0.65+0.35 moles=0.10 moles[/tex]
According Avogadro law of gases:
[tex]\frac{V_1}{n_1}=\frac{V_2}{n_2}[/tex]
[tex]V_2=\frac{V_1\times n_2}{n_1}=1.15 L[/tex]
The closest answer from the given options is option 1.2 L.
From the explanation, we are given that:
The mole of gas [tex]{n_1}[/tex] = [tex] 0.65 moles[/tex]The volume it occupies [tex]{V_1}[/tex] = [tex] 750.0ml[/tex] = [tex]0.750L[/tex]Mole of Neon = [tex]0.35ml[/tex]The volume of gas it occupies when [tex]0.35moles[/tex] = [tex]{V_2}[/tex] (unknown)
Therefore we have:
[tex]{n_2}[/tex] = [tex]0.65[/tex] + [tex]0.35[/tex] = [tex]0.10moles[/tex] , [tex]{n_1}[/tex] = [tex]0.65moles[/tex]
Further ExplanationTo solve this question, we have to consider the Avogadro’s law, which state that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules”
The law can be expressed as:
[tex]\frac{V_1}{n_1}=\frac{V_2}{n_2}[/tex]
[tex]V_2=\frac{V_1\times n_2}{n_1}[/tex]
[tex]V_2=\frac{0.750\times 0.10}{0.65}[/tex] = [tex]1.15L[/tex]
[tex]1.2L[/tex]
Therefore, the correct answer is 1.2L
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A syringe contains 0.65 moles of he gas that occupy 900.0 ml. what volume (in l) of gas will the syringe hold if 0.35 moles of ne is added? brainly.com/question/6860167A syringe contains 0.65 moles of he gas that occupy 750.0 ml. brainly.com/question/6442444KEYWORDS:
molessyringeconvertlitresavogradro's lawThe molar mass of sodium chloride is 58 g/mol. how many grams of sodium chloride are in 0.5 mol of sodium chloride?
Answer:
[tex]29 g. NaCl[/tex]
Explanation:
we know that it's molar mass is [tex]58 \frac{g}{mol}[/tex]
This means that 1 mol of sodium chloride contains 58g of sodium chloride; now How many grams of [tex]NaCl[/tex] are in 0.5 moles?
[tex]1 mol \longrightarrow 58g\\ 0.5 mol\longrightarrow x\\ x=\frac{0.5mol.58g}{1mol}=29g[/tex]
In 0.5 mol of NaCl there will be 29 g of sodium chloride