The basic building block of chemistry is known as the atom. The smallest particle of an element that still retains all the properties of the element is known as the atom. The correct option is C.
What is an atom?The atom can be considered as the basic building blocks of matter which possess the properties of the chemical element. An atom don't exist independently, instead they form ions and molecules which in turn combine in large numbers to form matter.
An atom is an indivisible particle and it contains the sub-atomic particles like protons, electrons and neutrons. The positively charged particles are called protons, the negatively charged particles are called electrons. The neutrons are chargeless particles.
All atoms of the same element are identical but different elements have different types of atoms. The chemical reactions occur when the atoms are rearranged.
Thus the correct option is C.
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Describe how the periodic table differentiates between metals and nonmetals. what type of element is most abundant: metals, nonmetals, or metalloids? give the names and symbols of three metalloids from the periodic table. identify items in your life that are made of each type of element: metal, nonmetal, and metalloid. for each item, explain why the properties of that type of element are necessary for the function of that item. prezi
1. Elements of the periodic system are divided into three groups of metals, nonmetals, and metalloids. Metals in the periodic table are separated of nonmetals by metalloids. Metals are located on the left side and the nonmetals on the right side of the periodic table. On a periodic table often is showed a stair-step line from boron to polonium which represents metan-nonmetal border. The only exception is hydrogen that is nonmetal although it is situated on the left side.
2. The most numerous elements in the periodic system are metals. At the moment, there are a total of 94 metals. There are 38 transition metals, 15 lanthanides, 15 actinides, 6 alkali metals, 6 alkaline earth metals, and 14 post-transition Metals. As regarding nonmetals, their number in the periodic table is 17 and there are 7 metalloids.
3. Metal: I would choose a copper wire, made as the name suggests from a copper that has the ability to perfectly conduct electricity.
Metalloid: I would choose a smartphone that contains computer chips made from silicon that has the property of a semiconductor.
Nonmetal: I would choose a camera flash that contains xenon, a gas which produces a white flash light when it is electrically excited.
4. Boron is a metalloid with the chemical symbol B and a serial number 5. In the periodical system, it is located in the 13th group and 2nd period.
Silicon is a metalloid with the chemical symbol Si and a serial number 14. In the periodical system, it is located in the 14th group and 3rd period.
Antimony is a metalloid with the chemical symbol Sb and serial number 51. In the periodical system, it is located in the 15th group and 5th period.
When NaOH is added to water, the hydroxide concentration increases. What can you conclude about NaOH?
Answer:
NaOH dissociates into ions.
Explanation:
Hydroxide is one of the ions that compose NaOH, therefore the NaOH must dissociate into its constituent ions:
NaOH ⇒ Na⁺ + OH⁻
Calculate the mass of aluminum in 250 g of Al(C2H3O2)3
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted. if 0.500 moles of a monoprotic weak acid (ka = 5.0 × 10-5) is titrated with naoh, what is the ph of the solution at the half-equivalence point?
How does size influence the appearance of a star? Give an example in your response
ILL GIVE 40PTS
When the size of a star increases, the brighter it gets.
The color of the star is determined by the temperature.
If the temperature of the star is lower, that means the star is an orange/red color.
If the star's temperature is higher, that means the star is an blue/white color.
the variable that a scientist changes when conducting an experiment is called the _____variable.
a. dependent
b.responding
c.manipulated
Answer: The correct answer is option (a).
Explanation:
Dependent variables are the variables whose value depend on another variable. Its value changes as the independent variable changes.
Independent variables are the variables which do not depend on any other variable beside . Its value does not change with a change in other dependent variables.
While conducting experiment scientist changes dependent variable in order to record observations.
In a chemical reaction, it is determined that the equilibrium constant is 0.213. Which of the following is a correct statement regarding this reaction?
There are more products than reactants at equilibrium.
The reaction will continue until no reactant remains.
There are more reactants than products at equilibrium.
The reaction has stopped completely.
Final answer:
The correct statement for a chemical reaction with an equilibrium constant of 0.213 is that there are more reactants than products at equilibrium.
Explanation:
Given that the equilibrium constant is 0.213 for a chemical reaction, we can make certain determinations about the state of the reaction at equilibrium. When the equilibrium constant (K) is less than 1, this generally means that the ratio of products to reactants at equilibrium is small and the reaction system favors the reactants. Therefore, the correct statement is that there are more reactants than products at equilibrium.
It is important to understand that when equilibrium is reached, the reaction has not stopped; rather, it is a dynamic state where the forward and reverse reactions continue at the same rate, maintaining constant concentrations of reactants and products. The idea that the reaction continues until no reactant remains is incorrect because a reaction at equilibrium does not favor complete conversion to products unless the equilibrium constant is significantly greater than 1.
20 points
Choose all the answers that apply. Which of the following is an example of an ion?
Na+
Cl-
Ar
F+
na+ cl- and f+ is the answer
If the concentration of cucl2 drops from 1.000 m to 0.655 m in the first 30.0 s of the reaction, what is the average rate of reaction over this time interval?
The average rate of reaction is calculated by dividing the change in concentration of a reactant or product by the time interval. For CuCl₂ decreasing from 1.000 M to 0.655 M in 30.0 s, the average rate of reaction is 0.0115 M/s.
The average rate of reaction over a given time interval can be determined by calculating the change in concentration of a reactant or product and dividing by the time interval over which the change occurred. In the scenario provided, the concentration of CuCl₂ decreases from 1.000 M to 0.655 M over a period of 30.0 seconds. To calculate the average rate of reaction, we follow these steps:
Identify the initial concentration and final concentration of CuCl₂. In this case, [tex]C_{i}[/tex]= 1.000 M and [tex]C_{f}[/tex] = 0.655 M.Calculate the change in concentration (ΔC) using the formula ΔC = [tex]C_{f}[/tex]- [tex]C_{i}[/tex]. Therefore, ΔC = 0.655 M - 1.000 M = -0.345 M. The negative sign indicates a decrease in concentration.Determine the time interval (t) over which the change in concentration has occurred, which is given as 30.0 s.Calculate the average rate of reaction (Rate) using the formula Rate = ΔC / t. The correct answer is thus Rate = -0.345 M / 30.0 s = -0.0115 M/s.The negative sign in rate typically indicates the consumption of a reactant. However, when discussing rates of reaction, it is common to report them as positive values, so the average rate of reaction from this calculation would be 0.0115 M/s.
A solution was prepared by dissolving 25.0 g of kcl in 225 g of water. calculate the mass percent of kcl in the solution.
Final answer:
The mass percent of KCl in the solution is calculated by dividing the mass of KCl by the total mass of the solution and then multiplying by 100%, resulting in a mass percent of 10%.
Explanation:
To calculate the mass percent of KCl in the solution, you can use the formula: (mass of solute ÷ mass of solution) × 100%. First, calculate the mass of the solution by adding the mass of KCl and the mass of water. In this case, it would be 25.0 g of KCl + 225 g of water, which equals 250.0 g of solution.
Now, take the mass of KCl (25.0 g) and divide it by the mass of the solution (250.0 g). Multiply the result by 100% to get the mass percent of KCl in the solution.
So, the calculation is (25.0 g ÷ 250.0 g) × 100% which equals 10%. Therefore, the mass percent of KCl in the solution is 10%.
Starting with acetylene and bromoethane, show how you would use reagents from the table to synthesize 4-methyl-3-hexanone. (enter your choices as a string of letters without punctuation, i.e. ace.)
The average rate of consumption of br− is 1.86×10−4 m/s over the first two minutes. what is the average rate of formation of br2 during the same time interval?
The average rate of formation of Br₂ during the first two minutes is 1.12×10⁻⁴ M/s.
This was calculated using the stoichiometric relationship between Br⁻ and Br₂ in the given reaction. The rate of formation is obtained by multiplying the rate of disappearance of Br⁻ by the stoichiometric ratio (3/5).
The chemical reaction in question is:
5Br⁻(aq) + BrO₃⁻(aq) + 6H⁺ (aq) → 3Br₂(aq) + 3H₂O(l)
Given that the average rate of consumption of Br⁻ (bromide ions) is 1.86×10⁻⁴ M/s, we need to determine the average rate of formation of Br₂ (bromine) during the same time interval.
This reaction shows that for every 5 moles of Br− consumed, 3 moles of Br₂ are produced. Therefore, the rate of formation of Br₂ will be:
Rate of Br₂ formation = (3/5) × Rate of Br⁻ consumption
Using the given rate of Br− consumption:
Rate of Br₂ formation = (3/5) × 1.86×10⁻⁴ M/s = 1.12×10⁻⁴ M/s
Thus, the average rate of formation of Br₂ during the first two minutes is 1.12×10⁻⁴ M/s.
Kia is doing an experiment in science lab. She is given a beaker containing 100 g of liquid. The beaker has markings on the side for measuring volume. The water comes up to the 100 mL mark. Kia puts the liquid on a hot plate by mistake. By the time she realizes the mistake, half of her liquid has evaporated.
Kia still needs 100 g of liquid for her experiment. To find out how much liquid she has to replace, she needs to re-weigh her liquid. However, the balance she used before is now broken. The teacher tells Kia that she can tell how much water is left by looking. The water now comes up to the 50 mL mark.
How much mass does Kia's remaining water have?
The correct answer is 50g.
I need help on all of these
An example of kinetic energy continuously being changed to potential energy and back again might be -
f electric charges moving in a straight path
g a train moving down a track
h a plate sitting on the edge of a table
j a girl swinging on a swing
what is the number of electrons shared between the atoms in I2 molecule (That is an i not a 1)
1) 7
2) 2
3) 8
4) 4
I2, or iodine, is a diatomic molecule held together by a single covalent bond. In this bond, two electrons are shared. Therefore, the answer is 2.
Explanation:The molecule of I2, or iodine, is a diatomic molecule; that is, a molecule consisting of two iodine atoms. This molecule is held together by a single covalent bond. Covalent bonds are formed when atoms share electrons. In a single covalent bond, two electrons are shared - one from each atom involved. Therefore, in an I2 molecule, the number of electrons shared between the atoms is 2.
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A sample of c3h8 has 4.56 Ã 1024 h atoms. how many carbon atoms does the sample contain?
how many grams of glucose, C6H12O6, in 2.47 mole?
One of the most important industrial sources of ethanol is the reaction of steam with ethene derived from crude oil: c2h4(g) + h2o(g) â c2h5oh(g)δh o rxn = â47.8 kjkc = 9.00 à 103 at 600. k at equilibrium, the partial pressure of ethanol (c2h5oh) is 200. atm and the partial pressure of water is 400. atm. calculate the partial pressure of ethene (c2h4).
Using the given data, calculate the rate constant of this reaction.
Which of these is an element?
A. Oxygen
B. Sodium Chloride
C. Water
D. Air
is a measure of the quantity of matter in an object. A) Volume B) Mass C) Density D)Weight
Answer:
Mass is a measure of the quantity of matter in an object
Explanation:
If a 3.00-l flask contains 0.400 mol of co2 and 0.100 mol of o2 at equilibrium, how many moles of co are also present in the flask?
The equilibrium constant is the proportion of the equilibrium concentration of the product to the reactants. The moles of CO present in a flask is 1.89 moles.
What are moles?Moles are the product of the molar concentration and the volume of the solution. It is given in mol.
The balanced chemical reaction can be shown as:
[tex]\rm 2CO(g) + O_{2}(g) \rightarrow 2CO_{2}(g)[/tex]
The equilibrium constant is given as,
[tex]\rm K_{c} = \dfrac{[CO_{2}]^{2}}{[CO_{2}]^{2} [O_{2}]}[/tex]
The concentration of carbon dioxide is calculated as:
[tex]\dfrac{0.4 \;\rm mol}{3\;\rm L} = 0.13[/tex]
The concentration of oxygen is calculated as:
[tex]\dfrac{0.1 \;\rm mol}{3\;\rm L} = 0.03[/tex]
Substituting values in the formula of the equilibrium constant:
[tex]\begin{aligned}{1.4 \times 10^{2} &= \rm \dfrac{0.13^{2}}{ [CO]^{2} \times 0.03}\\\\\rm [CO] &= \sqrt{0.004} \\\\&= 0.63 \end{aligned}[/tex]
The moles of carbon monoxide will be [tex]0.63 \times 3 = 1.89\;\rm moles.[/tex]
Therefore, 1.89 moles of carbon monoxide are present in the flask.
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The correct answer is that there are 0.200 moles of CO present in the flask at equilibrium.
To solve this problem, we need to consider the chemical equilibrium of the reaction involved, which is the decomposition of carbon dioxide (CO2) into carbon monoxide (CO) and oxygen (O2). The balanced chemical equation for this reaction is:
[tex]\[ \text{CO}_2(g) \rightleftharpoons \text{CO}(g) + \frac{1}{2}\text{O}_2(g) \][/tex]
According to the stoichiometry of the balanced equation, for every mole of CO2 that decomposes, one mole of CO is produced and half a mole of O2 is produced.
Given that we have 0.400 moles of CO2 and 0.100 moles of O2 in the flask, we can use the stoichiometry of the reaction to find out how many moles of CO are present. Since the reaction produces one mole of CO for every mole of CO2 that decomposes, we can calculate the moles of CO produced by the decomposition of CO2 as follows:
[tex]\[ \text{Moles of CO produced} = \text{Moles of CO2 decomposed} \][/tex]
However, we also know that the reaction produces half a mole of O2 for every mole of CO2 that decomposes. Therefore, the moles of O2 produced can be calculated as:
[tex]\[ \text{Moles of O2 produced} = \frac{1}{2} \times \text{Moles of CO2 decomposed} \][/tex]
Since we have 0.100 moles of O2, we can set up the equation:
[tex]\[ 0.100 = \frac{1}{2} \times \text{Moles of CO2 decomposed} \][/tex]
Solving for the moles of CO2 decomposed, we get:
[tex]\[ \text{Moles of CO2 decomposed} = 0.100 \times 2 = 0.200 \][/tex]
This means that 0.200 moles of CO2 have decomposed to produce 0.200 moles of CO and 0.100 moles of O2. Therefore, the moles of CO present in the flask at equilibrium is 0.200 moles.
A 14.01 g sample of n2 reacts with 3.02 g of h2 to form ammonia (nh3). if ammonia is the only product, what mass of ammonia is formed? 17.01 g 1.10 g 14.01 g 3.02 g 23.07 g
Final answer:
The mass of ammonia formed when 14.01 g of N2 reacts with 3.02 g of H2 is the sum of the reactant masses, which equals 17.03 g of NH3.
Explanation:
The question involves a chemical reaction where nitrogen gas (N2) reacts with hydrogen gas (H2) to form ammonia (NH3). The balanced equation for the formation of ammonia is:
N2(g) + 3H2(g) → 2NH3(g).
In the scenario provided, 14.01 g of N2 reacts with 3.02 g of H2. Given the stoichiometry of the reaction and the law of conservation of mass, the mass of the reactants equals the mass of the product. Therefore, if you start with 14.01 g of N2 and 3.02 g of H2, the mass of ammonia formed would be the sum of the masses of nitrogen and hydrogen, which is 17.03 g NH3.
number of moles in 3.70 x 10^-1 g of boron
Answer:
0.0342 mol
Explanation:
The molar mass of boron is 10.81 g/mol, that is, 1 mole of boron (6.02 × 10²³ molecules of boron) has a mass of 10.81 grams. This is the ratio that we will use to find the number of moles in 3.70 × 10⁻¹ g, using a conversion fraction.
3.70 × 10⁻¹ g B × (1 mol B / 10.81 g B) = 0.0342 mol B
To find the number of moles in Boron, you divide the given mass by the molar mass of Boron. Given the mass of Boron as 3.70 x 10^-1 g and the molar mass as 10.8 g/mol, the result is approximately 0.034 moles.
Explanation:To find the number of moles in a sample, we use the formula: Moles = mass / molar mass. We already know the mass of boron, which is 3.70 x 10^-1 g. The average atomic mass of boron, considering its isotopes, is approximately 10.8 amu. Converting this into grams gives you 10.8 g/mol (since 1 amu = 1 g/mol).
Therefore, the number of moles of boron is calculated to be Moles = 3.70 x 10^-1 / 10.8 = approximately 0.034 moles.
Note that an atomic mass unit (amu) is basically the mass of one atom, on a scale where the carbon-12 atom is exactly 12.0 amu. However, no single boron atom weighs exactly 10.8 amu; 10.8 amu is the average mass of all boron atoms, considering the isotopes.
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what is the representative particle for silicon
Final Answer:
The representative particle for silicon is the silicon atom.
Explanation:
Silicon, a chemical element with the symbol Si and atomic number 14, is a metalloid commonly found in nature. The representative particle for silicon is the silicon atom, which serves as the fundamental building block of silicon-based materials. At its core, silicon has 14 protons and electrons, and its atomic mass is approximately 28.09 atomic mass units (amu). The electronic configuration of a silicon atom is 1s² 2s² 2p⁶ 3s² 3p², indicating the distribution of electrons in its various energy levels and orbitals.
Silicon's unique atomic structure contributes to its versatile properties, making it a crucial element in the field of electronics and semiconductor technology. The outermost electron shell of a silicon atom contains four electrons, allowing silicon to form covalent bonds with other atoms, particularly other silicon atoms.
This ability to form strong covalent bonds is essential for the creation of the crystalline structure that characterizes silicon in its solid state. Silicon's role as a semiconductor arises from its ability to conduct electricity under certain conditions, making it an integral component in the production of microchips and other electronic devices.
In summary, the silicon atom, with its specific atomic number, mass, and electron configuration, serves as the representative particle for silicon. Understanding the properties of the silicon atom is fundamental to grasping the unique characteristics that make silicon a cornerstone of modern technology.
A mole of silicon contains 6.02 × 10²³silicon atoms.
A representative particle is the smallest unit in which a substance naturally exists. For the majority of elements, the representative particle is the atom. Silicon (Si), with an atomic number of 14 and an atomic mass of 28.09, is no exception to this rule. Therefore, the representative particle for silicon is the atom. This means a mole of silicon contains 6.02 × 10²³ silicon atoms, as determined by Avogadro's number.
A solution has an initial concentration of 0.0100 m hclo (ka = 3.5×10−8 ) and 0.0300 m naclo. what is the ph after the addition of 0.0030 mol of solid naoh to 1.00 l of this solution? assume no volume change.
What mass (in grams) of iron(iii) oxide contains 58.7 g of iron? iron(iii) oxide is 69.94 % iron by mass?
Calculate the theoretical yield of ammonia produced by the reaction of 100g of H2 gas and 200g of N2 gas
Describe how the law of conservation of energy is demonstrated in this laboratory activity.
Law of conservation of energy can be evidenced by the total heat energy of reaction and mechanical energy of dynamic system. And the energy transfer into mass during a nuclear reaction.
What is law of conservation of mass?According to energy conservation law, energy can neither be created nor be destroyed. Therefore, the total energy in a system is conserved.
However, energy can be transformed from one form to the other such as conversion of electrical energy to chemical energy, electrical energy to mechanical energy etc.
The sum of kinetic energy and potential energy is called mechanical energy. If kinetic energy of a body increases, its potential energy decreases. Thus, total mechanical energy is constant.
This can be well explained by ,measuring the kinetic and potential energy of the a moving pendulum when it is at rest and on motion.
Similarly in chemical reactions, the total heat energy will be constant and if we take the nuclear reactions, where the energy of the product side and reactant side will be equal.
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