Elements are now organized by increasing atomic mass. Hence, option B is correct.
What is a periodic table?The periodic table is a tabular array of chemical elements organized by atomic number.
Mendeleev's periodic table orders the elements based on their atomic mass whereas the Modern periodic table orders the elements based on their atomic number.
Hence, option B is correct.
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A solution of potassium nitrate is made when potassium nitrate dissolves in water.
Describe a method you could use to obtain crystals of potassium nitrate from
potassium nitrate solution.
You should include an explanation of the process by which the crystals are produced
from the solution.
[6 marks]
Answer:
Boil the water and stir in potassium nitrate. If it doesn't all dissolve, you can cook it on the stove or microwave it until the water boils again. Remove the solution from heat, but let it cool slowly for the best crystal formation.
(i) Give the two dyes that are mixed to make brown hair dye.
Answer:
green n yellow and white and black and white sq
Which statement is true about A nickel-cadmium dry cell?
Answer:
The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.
What is the increment of change in a series of straight-chain alkanes?
CH
CH3
CH4
CH2
What is the increment of change in a series of straight-chain alkanes?
CH
CH3
CH4
CH2
Answer:
CH2
Random molecular motion of a substance is the greatest when the substance is
Answer: a gas
The gas phase is the phase where particles are packed the least tightly together.
The ph of an acidic solution containing a [h] of 7.23 x 10-m
Answer:
the pH of a solution if h+ 1.0 x 10-9 M
5
Explanation:
Concentration (mol/L)[H3O+]pHpOH1 x 10-8861 x 10-9951 x 10-10104
Which of the following chemical reactions represents an acid-base reaction?
HBr + KOH -> KBr + H2O
ZnCl2 + MgSO4 -> ZnSO4 + MgCl2
H2SO4 + CaCl2 -> CaSO4 + HCl
NH4OH + KCl -> KOH + NH4Cl
Answer:
HBr + KOH -> KBr + H₂O
Explanation:
Acid-base reactions always produce a salt [KBr] and water [H₂O].
Out of the given reactions, the reaction HBr + KOH -> KBr + H₂O is an acid base reaction.
An acid–base reaction is a chemical reaction that occurs between an acid and a base and results in the formation of salt and water.
Here in this reaction HBr + KOH -> KBr + H₂O, HBr is an acid and KOH is a base, together they undergo a neutralization reaction to form a salt KBr and water .
An acid-base reaction involves the transfer of protons (H⁺) between an acid and a base. Acids are the substances which can donate protons, while bases are substances that can accept protons.
In an acid-base reaction, the acid donates a proton (H⁺) to the base, forming water (H₂O) and a salt. The salt is typically formed by the cation of the base combining with the anion of the acid.
In this reaction, HBr donates a proton (H⁺) to KOH, which acts as a base and accepts the proton to form water (H₂O), while KBr is formed as a salt. This is a classic example of an acid-base reaction, where an acid and a base react to form a salt and water.
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Jason and yolanda both drew a simple random sample from a non-normally distributed population of 25,000. Jason’s sample consisted of 0. 24% of the population, while yolanda’s sample consisted of 0. 32% of the population. Whose sample can be used to make inferences about the population?.
Both the samples can be used to make inferences about the population.
What is Non-Normal Distribution?A non-normal distribution is when the data is concentrated on one side with decreasing amount streaming off to the left or right side
It is given in the question that
Total number of population = 25000
% of a sample of Jason = 0.24%
% of the sample of Yolanda's = 0.32%
According to the Jason's Sample
the number of the population is given by
0.24 * 25000 / 100
60
According to the Yolanda's Sample
The number of the population is given by
0.32 * 25000 / 100
80
Both the samples can be used to make inferences about the population.
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what did early atomic theory accomplish
Answer:
The concept of the atom (Greek: atomos, "indivisible"), an indivisible particle of matter, goes back to ancient Greece and a man named Democritus, a rival of Aristotle. Democritus held that all matter could be subdivided only until some finite particle was reached.Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties. Dalton based his theory on the law of conservation of mass and the law of constant composition. The first part of his theory states that all matter is made of atoms, which are indivisible.Atomic theory established that all matter is made of tiny particles, a discovery that led to amazing scientific breakthroughs in areas from modern chemistry to nuclear energy.Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.This atomic model has changed over time. Scientists used the model to make predictions. Sometimes the results of their experiments were a surprise and they did not fit with the existing model. Scientists changed the model so that it could explain the new evidence.Atomic theory originated as a philosophical concept in ancient India and Greece. The word "atom" comes from the ancient Greek word atomos, which means indivisible. According to atomism, matter consists of discrete particles. However, the theory was one of many explanations for matter and wasn't based on empirical dataEverything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms.Dalton's atomic theory suggested that the atom was indivisible and indestructible. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of this aspect of Daltons atomic theory.
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Forrest spills some acid on the lab floor. He notifies his teacher and begins to look for baking soda to neutralize the acid on the floor.
Who should be notified next?
The other students in the lab should be notified next in this type of scenario.
What is an acid?This is a substance which donates protons and is very corrosive. It also turns blue litmus paper red.
When it was spilled and baking soda was used to neutralize it on the floor , it is best to inform the other students too so as to prevent them from being exposed by mistake thereby reducing risk of injury.
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Question 7 (5 points)
(08.02 mc)
what is the mass of naci required to make 140 grams of a 12% solution of nach in water? (5 points)
12 grams
14 grams
oc
12 grams
od
18 grams
Answer: 18 g
Explanation:
[tex]0.12=\frac{\text{mass of NaCl}}{140}\\\text{mass of NaCl}=(0.12)(140)=16.8 \text{ g}[/tex]
The option closest to this is 18 g
Calculate the temperature change of copper metal that has a mass of 43.2 g and is allowed to absorb 1,345 J of heat. The specific heat capacity of copper is 0.385 J/°c g.
Answer: 80.9 K
Explanation:
[tex]Q=mc \Delta T\\\\1345=(43.2)(0.385) \Delta T\\\\\Delta T=\frac{1345}{(43.2)(0.385)} \approx \boxed{80.9 \text{ K}}[/tex]
can someone help me here please
Answer:
3) 670.7 °C (nearest tenth)
4) 818.2 torr (nearest tenth)
Explanation:
Question 3Charles's Law[tex]\sf \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\quad \textsf{(when pressure is constant and temperature is in kelvin)}[/tex]
where:
[tex]\sf V_1[/tex] = initial volume[tex]\sf V_2[/tex] = final volume[tex]\sf T_1[/tex] = initial temperature[tex]\sf T_2[/tex] = final temperatureGiven values:
[tex]\sf V_1[/tex] = 3 L[tex]\sf V_2[/tex] = 10 L[tex]\sf T_1[/tex] = 10°CConvert the temperature in Celsius to kelvin by adding 273.15:
⇒ [tex]\sf T_1[/tex] = 10 + 273.15 = 283.15 K
Substitute the given values into the formula and solve for T₂:
[tex]\implies \sf \dfrac{3}{10}=\dfrac{283.15}{T_2}[/tex]
[tex]\implies \sf 3 \cdot T_2=283.15 \cdot 10[/tex]
[tex]\implies \sf T_2=\dfrac{2831.5}{3}[/tex]
[tex]\implies \sf T_2=943.83333...\:K[/tex]
Converting kelvins back to Celsius:
[tex]\implies \sf T_2=943.83333...-273.15=670.68333...\:C^{\circ}[/tex]
Therefore, the final temperature will be 670.7 °C (nearest tenth).
Question 4Gay-Lussac's Law[tex]\sf \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\quad \textsf{(when volume is constant and temperature is in kelvin)}[/tex]
where:
[tex]\sf P_1[/tex] = initial pressure[tex]\sf P_2[/tex] = final pressure[tex]\sf T_1[/tex] = initial temperature[tex]\sf T_2[/tex] = final temperatureGiven values:
[tex]\sf P_1[/tex] = 760 torr[tex]\sf T_1[/tex] = 27°C[tex]\sf T_2[/tex] = 50°CConvert the temperature in Celsius to kelvin by adding 273.15:
⇒ [tex]\sf T_1[/tex] = 27 + 273.15 = 300.15 K
⇒ [tex]\sf T_2[/tex] = 50 + 273.15 = 323.15 K
Substitute the given values into the formula and solve for P₂:
[tex]\implies \sf \dfrac{760}{300.15}=\dfrac{P_2}{323.15}[/tex]
[tex]\implies \sf 760 \cdot 323.15=P_2 \cdot 300.15[/tex]
[tex]\implies \sf 245594=300.15 \cdot P_2[/tex]
[tex]\implies \sf P_2=\dfrac{245594}{300.15}[/tex]
[tex]\implies \sf P_2=818.23754...\:torr[/tex]
Therefore, the new pressure is 818.2 torr (nearest tenth).
Wave particle duality is most apparent in analyzing the motion of.
Answer:
Wave particle duality is most apparent in analyzing the motion of. an electron. A photon of which electromagnetic radiation has the most energy.
Wave particle duality is most apparent in analyzing the motion of an electron.
What is wave-particle duality used for?Wave-Particle duality used to realize the particle and wave nature of light. Based on the idea that light and all other electromagnetic radiation may be considered a particle or a wave nature, in 1923 physicists Louis De Broglie suggested that the same kind of duality must hold to matter.
For example, an electron that produced part of an electric current in a circuit behaves like a particle moving in unison with other electrons inside the conductor. The same electron acts as a wave when it passes over through with a solid crystalline structure and forms a diffraction image.
A photon of which electromagnetic radiation has the most energy.
Thus, Wave particle duality is most apparent in analyzing the motion of. an electron.
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What is the organic compound?
Answer:
propa-1-nol
Explanation:
easy clapp
calculate the moles of 70g of Li
[tex]\text{No. of moles} = \dfrac{\text{Mass of substance(Li)}}{\text{Molar mass of of substance(Li)}}\\\\\\~~~~~~~~~~~~~~~~~=\dfrac{70}{6.94}\\\\\\~~~~~~~~~~~~~~~~~=10.08~ \text{mol.}[/tex]
Predict the products.
nabr (aq) + mgcl2 (aq) ----> __ + __.
will the reaction occur?
Answer:
MgBr
NaCl
Explanation:
If a solution is made by using 0.45 moles of NaCl and dissolving it with water so that the total volume is 0.750 liters, what will the concentration of that solution be in molarity?
Answer:
.6 M
Explanation:
.45 moles / .750 liters = .6 M
What happens when a solid is dissolved into a liquid?
Solid particles float toward the surface layer of liquid particles.
O Solid particles sink down toward the bottom layer of liquid particles.
Solid particles become evenly dispersed among liquid particles.
Solid particles become suspended in the middle of liquid particles.
Answer:
C
Explanation:
chem ed 2022
When a solid is dissolved into a liquid,
Solid particles become evenly dispersed among liquid particles.So, option C is correct is one.
What is solution?When solid dissolve in liquid and form intimate mixture called solution.A solid mix completely in liquid by breaking solid particles into smaller one and dissolves in liquid.The minor part generally solid present in solution is called solute.The major part generally liquid in the solution is called solvent .learn about solid,
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I-131 undergoes beta-minus decay. The chemical symbol for the new element is.
The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.
What is a beta minus decay?A beta minus decay is one in which an electron is changed into a proton. The atomic number of the daughter nucleus will increase by one unit and is one place after the parent in the periodic table.
The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.
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In an electroplating apparatus, where does the reduction reaction occur?
On the surface of the anode
On the surface of the battery
In the solution
On the surface of the cathode
Answer:
on the surface of the cathode
Why is it important for scientists to use common units such as the metric system?
A. so they can effectively communicate their findings
B. so they can double check their data
C. so they can form similar hypotheses
D. so they can conduct controlled experiments
Answer:
The correct answer is A, or "so they can effectively communicate their findings.
Explanation:
The metric system is the international system of weights and measures, which is used universally in the scientific community. Scientists benefit from the metric system so that they can communicate theories, ideas and most importantly data in a way everyone understands. It is virtually impossible to comprehend any modern, data-rich research in the natural or physical sciences without referring to the metric system and being able to contextualize the numbers and units it includes.
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Strontium bromide contains only strontium and bromine. What is the formula for this compound?.
[tex]SrBr_{2}[/tex]
Explanation:Chemical formulas are a way to show the elements and the amount of each element present in a compound.
Element Symbol
To write a chemical formula you need to use their chemical symbols. So, we need to find the symbols for strontium and bromide.
Strontium is SrBromine is BrCharges
However, elements do not combine in random ratios. The ratios are based on charges so that all compounds have a neutral charge. Elements will have different subscripts to ensure that compounds have a neutral overall charge. So, to correctly write the formula we need to know the charges Sr and Br have when they became ions.
Sr gains a charge of +2Br gains a charge of -1To cancel the positive 2 out, we must have 2 bromines. That means the final formula for strontium bromide is [tex]SrBr_{2}[/tex]. Now, the compound has a charge of 0.
How do hollow bones improve the survival of birds? (1 point )
Answer:
Hollow bones allow the birds to fly. They're quite dense, and that density allows for flight! Because we humans do not have hollow bones, our bodies are much too heavy to fly on our own. If we did, we'd probably be able to fly.
Explanation:
For group 1a metals, which electron is the most difficult to remove?
The periodic table contains groups and periods that include the elements. For group 1 metal lithium is least likely to lose an electron.
What are group 1 metals?Group 1 metals are the alkali metals that include, Li, Na, K, Rb, and Cs. They show the property exhibited by the metals. The chemical trends of group 1 show that cesium loses an electron more easily than the other elements.
When going down the group the tendency to lose electrons increases as the atomic radius increases. The electron gets far away from the nucleus making it easy to get removed.
Therefore, lithium being the first element of the group has the smallest radii and is least likely to lose an electron.
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How to draw ethyl pentanoate?
What is the energy of a photon of infrared radiation with a frequency of 2.53 × 1012 Hz? Planck’s constant is
6.63 × 10–34 J • s.
Answer: C, 1.68 x 10^-21
Explanation: Edge 2022
Which type of isomers are o-xylene, m-xylene, and p-
Xylene?
A.optical isomers
B.structural isomers
C.geometric isomers
The o-xylene, m-xylene, and p-Xylene are constitutional isomers. The correct option is D.
What are isomers?Isomers are the elements or polyatomic elements that have similar molecular formula.
All options are attached here:
A.optical isomers
B.structural isomers
C.geometric isomers
D.constitutional isomers
Thus, the correct option is D.constitutional isomers.
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Consider the balanced reaction
below:
2AI+ 3Cl₂ → 2AICI 3
->>
How many grams of aluminum are
required to produce 8.70 moles of aluminum chloride?
The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g
What is the use of aluminium chloride ?
Aluminum chloride is useful for the treatment of palmar, plantar, and axillary hyperhidrosis.
Aluminum chloride has also been reported to be useful in facial and scalp hyperhidrosis
The balanced chemical equation represents the mole ratio in which the chemicals combine.
In this case, illustrates that 2 mol Al produces 2 mol Al Cl₃, hence these 2 chemicals are in a 1:1 ratio.
Thus, to produce 8.70 mol aluminium chloride, it will require 8.70 mol aluminium.
But this quantity of Al has a mass in grams of
m = n × Mr
= 8.70 mol × 27g/mol
= 234.9 g
Hence, The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g
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Which is the correct label of the parallel lines? Parallel lines a and b are shown. Points A and B lie on line a while points C and D lie on line b. The letters a and b are separated by two vertical lines. There is a horizontal line with arrows on either end over the letters A A. There is another horizontal line with arrows on either end over the letters C B. A vertical line with a horizontal line intersecting it at the bottom separates the two pairs. There is a horizontal line over the letter A with one arrow on the right end. There is a horizontal line over the letter B with one arrow on the right end. The letters are separated by two vertical lines. There is a horizontal line with arrows on either end over the letters A A. There is another horizontal line with arrows on either end over the letters C B. A vertical line with a horizontal line intersecting it at the bottom separates the two pairs. Question 5(Multiple Choice Worth 1 points) (01.01 LC) Anna draws an angle in her notebook. In how many points do the rays intersect? 2 0 1 3 Question 6(Multiple Choice Worth 1 points) (01.01 MC) Is the image an example of perpendicular lines? line AB intersects with another line at 90 degrees Yes; the lines intersect. Yes; the lines intersect at a right angle. No; the lines never touch. No; the lines are one-dimensional. Question 7(Multiple Choice Worth 1 points) (01.01 LC) Which term best describes the geometric figure? A location is labeled A. Line Point Ray Segment Question 8(Multiple Choice Worth 1 points) (01.01 LC) Which undefined term is needed to define a circle? Point Radius Line Ray Question 9(Multiple Choice Worth 1 points) (01.01 LC) Which of the following is a flat surface that extends infinitely, has length and width, but does not have depth? Angle Circle Plane Segment Question 10(Multiple Choice Worth 1 points) (01.01 MC) James defines an angle as "a figure consisting of two rays." His statement is not precise enough because he should specify that the rays must be
Answer: B) the answer is CD with the line on top
Explanation: