The elements of Group 1 (the alkali metals) have the most reactive metals.
Cesium (Cs) is so reactive that it reacts explosively with water.
The alkali metal family contains the most reactive metals, with sodium (Na) as an example of a highly reactive alkali metal.
The most reactive metals are found in the alkali metal family, which is located in group 1 of the periodic table. The reactivity of metals in this group increases as you move down the group. An example of an alkali metal is sodium (Na), which is known for its high reactivity, especially with water, often producing hydrogen gas and a strong exothermic reaction.
Apart from alkali metals, the alkaline earth metals in group 2 are also relatively reactive but less so than alkali metals. For instance, calcium (Ca) is an alkaline earth metal that reacts with water, albeit less vigorously than sodium or other alkali metals. In contrast, the noble gases in group 18, such as helium (He) and neon (Ne), are known for their lack of reactivity, hence the term 'inert gases.'
What is a possible quantum number set for an electron in the 2s orbital of a beryllium (Be) atom?
Answer is: 2,0,0,±1/2.
1) n = 1. The principal quantum number (n) is one of four quantum numbers which are assigned to each electron in an atom to describe that electron's state.
2) l = 0. The azimuthal quantum number is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital.
3) ml = 0. Magnetic quantum number specify orientation of electrons in magnetic field and number of electron states (orbitals) in subshells.
Magnetic quantum number (ml) specifies the orientation in space of an orbital of a given energy and shape . Magnetic quantum number divides the subshell into individual orbitals which hold the electrons, there are 2l+1 orbitals in each subshell.
4) The spin quantum number, ms, is the spin of the electron; ms = +1/2 or -1/2.
The possible quantum number set for an electron in the 2s orbital of a beryllium (Be) atom is n=2, l=0, ml=0, and ms=+1/2 or -1/2.
Explanation:The possible quantum number set for an electron in the 2s orbital of a beryllium (Be) atom can be described as follows:
Principal quantum number (n): 2Azimuthal quantum number (l): 0Magnetic quantum number (ml): 0Spin quantum number (ms): +1/2 or -1/2These quantum numbers represent the energy level, shape, orientation, and spin of the electron in the 2s orbital.
DIMENSIONAL ANALYSIS PLSSSS
convert 19 inches to feet(show work)
19 in = 1.6 ft
You know that
12 in = 1 ft
If you divide both sides by 12 in, you get the conversion factor: 1 = 1 ft/12 in.
If you divide both sides by 1 ft, you get the conversion factor: 12 in/1 ft = 1.
Both are conversion factors because they both equal one and multiplying a measurement by one does not change its value.
You choose the conversion that gives you the correct dimensions for your answer. It must have the correct dimensions on top (in the numerator),
Thus, to convert 19 in to ft, you use the conversion factor with “ft” on the top.
∴ Length = 19 in × (1 ft/12 in) = 1.6 ft
what is the electron configuration for iodine
Hello!
To find electron configuration for Idoine we need to understand the following steps:
Finding the Atom's Atomic Number (tells us the specific number of electrons)Determining the Charge of the Atom Understanding the orbitals (Set S [Contains 2], P [Contains 3, Holds 6], D [Contains 5, Holds 10], F [Contains 7, Holds 14], and there are some theoritical ones.) [Overall the sets go SPDFGHIKUnderstanding notations in configuartion. The notations display the number of electrons in the atom and set.In this case, for Iodine. If we follow these rules we can see that the electron configuration is [Kr] 4d^10 5s^2 5p^5. We use Krytpon in front because that is the last full and stable noble gas before this particular element. Atoms are just trying to be stable so the goal is to achieve that full shell.
The electron configuration for a neutral iodine atom is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵, and for an iodine anion (I⁻), it gains one more electron, resulting in 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶.
Explanation:The electron configuration of iodine (I), which is a halogen with the atomic number 53, follows the aufbau principle and Hund's rule, filling orbitals in order of increasing energy. For a neutral iodine atom, the electron configuration is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵.
When iodine forms an anion with a 1- charge, such as when it's added to table salt as an essential dietary element to prevent goiter, it gains an extra electron. The electron configuration for the iodine anion (I⁻) is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶.
two scientists work together on an experiment but they have different hypothesis when the scientist look at experimental results they interpret the data in different ways and come up with different conclusions which of the following does this situation best illustrate
a) scientific consensus
b) peer view
c) selection bias
d) confirmation bias
Answer: Option (d) is correct.
EXplanation:
The susceptibility to search for interpreted data in such a way that confirms the hypothesis is known as confirmation bias.
Scientific consensus is the collective decision or opinion of scientists in an experiment or study.
Peer view is the collective view of two or more persons in an experiment that will lead to a collective conclusion.
Selection bias is the bias that occurs because of selection of data due to which proper results are not obtained.
Therefore, when two scientists work together on an experiment but they have different hypothesis and when the scientist look at experimental results they interpret the data in different ways and come up with different conclusions, this situation is a confirmation bias.
Thus, out of the given options, option (d) is correct.
Which of the following best describes technology
IMPROVES RESULTS APEX!!!!1
The following best describes technology is:
C. the application of engineering to create useful products.
Technology is the application of scientific knowledge to solve practical problems. It is the use of tools, machines, and other methods to do things more efficiently and effectively. Technology can be used to create products, services, and systems that improve our lives.
Engineering is the discipline that applies scientific principles to design and build structures, machines, and other products. Engineers use their knowledge of science and mathematics to solve problems and create new products.
When engineers apply their knowledge to create useful products, they are using technology. For example, engineers used their knowledge of physics and chemistry to create the first computers. They also used their knowledge of engineering to design and build the machines that are used to manufacture computers.
So, technology is the application of engineering to create useful products. It is the use of scientific knowledge to solve practical problems and improve our lives.
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The complete question is:
Which of the following best describes technology
A. Something created for only scientists to use
B. the method of thinking that scientists use.
C. the application of engineering to create useful products.
D. A scientific idea
A student titrates a 25 ml of an unknown concentration of hcl with 35 ml of a 0.890 m solution of koh to reach the equivalence point. what is the ph of the hcl solution? A) 1.2 B) -0.10 C) 0.10
Hello!
The chemical equation for the neutralization of HCl with KOH is the following:
HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)
To calculate the concentration of the unknown solution, we can apply the following equation for the equivalence point:
So, the concentration of the HCl solution is 1,246 M
Have a nice day!
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In which two types of reactions do opposite chemical changes occur
Hello!
Before I can answer your question we need to know the different types of chemical reactions that can occur:
Single ReplacementDouble ReplacementSynthesisDecompositionCombustionCombustion is an answer that can usually be ruled out unless oxidation is occuring in the chemical equation (hyrdrogen occuring with oxygen to react)
Synthesis reaction, also known as a Combination reaction, is when the reactants combine to form a single product.
Decompostion is when a single reactant is deconstructed to form multiple products, or the opposite of Synthesis.
With these definitions alone, since they are opposite types of reactions, the answer would be Synthesis and Decomposition reactions !
Hope this helps and if you need anymore clarification feel free to ask.
Answer: Synthesis and decomposition
do you think rayon when burnt will stick to the body like other synthetic fibres? why? pleeeeeeeaaaaaassseeeeee answer this question. half of the nerds in my class say yes and the other half say no. somebody pleaaaassseeee tell me the answer, 10 points for this
As mentioned in its properties, one of the properties of synthetic fibres is that it will stick to the body if in contact with fire, or high temperatures. Hence, as the answer follows, rayon, being a synthetic fibre, will stick to the body.
Is frying something a physical or chemical change?
i believe it is chemical change.
hope it helps
Which of the following is the correct name for the compound KBrO3? Potassium bromate Potassium (II) bromate Potassium (I) bromate Dipotassium monobromate
The correct name of the compound is potassium bromate.
KBrO₃ contains a metal, so it is an ionic compound.
The name of an ionic compound is: name of metal cation + name of anion .
Name the metal
The name of the cation is the name of the metal — potassium
The ion has only one charge (+1), so the name of the ion does not use a Roman numeral in parentheses.
Name the anion
BrO₃⁻ is an oxyanion. Name = (stem)ate = bromate.
Name the compound
The names of salts do not use multiplying prefixes like mono- or di-.
∴ metal ion + anion → potassium bromate
The correct name for the compound KBrO3 is potassium bromate.
Explanation:The correct name for the compound KBrO3 is potassium bromate. It is a chemical compound that was formerly used as a food additive in baking to improve dough elasticity and bread volume. It acts as a strong oxidizing agent. However, due to concerns about its potential carcinogenicity, many countries have banned or restricted its use in food products.
Potassium bromate can potentially break down into bromide, which can react with other compounds in baking to form brominated byproducts. As a result, safer alternatives like ascorbic acid (vitamin C) and potassium iodate are now commonly used in the baking industry to achieve similar results without health risks.
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A layer of sediment goes through a series of steps on its way to becoming sedimentary rock. These steps are summarized below. Read the steps carefully, and then place them in the correct order. The sediment is gradually buried and compacted. The sediment is deposited by wind, flowing water, or other natural processes. Dissolved minerals completely cement the sediment together.
Answer:
1. The sediment is deposited by wind, flowing water, or other natural processes.
2. The sediment is gradually buried and compacted.
3. Dissolved minerals completely cement the sediment together.
Explanation:
Weathering is the breakdown of rock by agents such as wind and water. Erosion is the transporting of the broken rock material, or sediments, to a new location, where it is deposited.
As more sediment is deposited, it stacks up in layers. Eventually, the upper layers put pressure on the lower layers. This causes sediments to pack closer together in a process called compaction.
Through the process of cementation, minerals from groundwater form between sediment grains, connecting the grains together to form rock.
The rocks formed from deposition, compaction, and cementation of sediment are sedimentary rocks.
The sediment goes through a series of steps to become sedimentary rock, which includes deposition, burial and compaction, and cementation.
Explanation:The correct order of the steps in which a layer of sediment becomes sedimentary rock is as follows:
The sediment is deposited by wind, flowing water, or other natural processes. The sediment is gradually buried and compacted. Dissolved minerals completely cement the sediment together.
As the speed increases how does the potential kinetic and total energy levels change
Hello,
As the speed increases the Energy does not change. This is because of Law of conservation of mass. Energy can be created or destroyed.
Thus the energy levels will stay the same but the form in which the energy is presented may change.
Hope this helps! Have a great day.
The electron's potential energy declines and its kinetic energy rises as its speed increases. The system's overall energy, however, doesn't change, since the increase in kinetic energy makes up for the decrease in potential energy.
What is potential energy ?Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is compressed or stretched, its potential energy increases. If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy.
The square of the object's velocity determines the kinetic energy. In other words, when an object's velocity twice, its kinetic energy quadruples.
The mechanical energy of an object is the total of its potential and kinetic energies. A falling object loses potential energy while gaining kinetic energy. The difference between the increase in kinetic energy and the decrease in potential energy is exact. Work is a further crucial idea.
Thus, the increase in kinetic energy makes up for the decrease in potential energy.
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You are doing chores to earn your allowance. For each chore you do, you earn $3.00. What is the independen variable?
What is the purpose of drawing a Bohr model of an atom
What are two parts of the peripheral nervous system
Answer:
The Somatic nervous system and The autonomic nervous system
are two parts of the peripheral nervous system.
Explanation:
The peripheral nervous system is a part of the nervous system which is present outside the spinal cord and the brain.
Its function is to link the central nervous system to the organs and limbs.
The peripheral nervous system is of two types
Somatic nervous system: its main function is to regulate the body movements and the control of voluntary muscular activity is called reflex arcs
The autonomic nervous system: its function is to control all the body functions like digestion, urination.heart rate, pupillary response, and respiratory rate.
What is the concentration (in M) of a 225ml potassium sulfate solution that contains 4.15g of potassium?
The concentration of solution in M or mol/L can be calculated using the following formula:
[tex]C=\frac{n}{V}[/tex] .... (1)
Here, n is number of moles and V is volume of solution in L.
The molecular formula of potassium sulfate is [tex]K_{2}SO_{4}[/tex] thus, there are 2 moles of potassium in 1 mol of potassium sulfate.
1 mol of potassium will be there in 0.5 mol of potassium sulfate.
Mass of potassium is 4.15 g, molar mass is 39.1 g/mol.
Number of moles can be calculated as follows:
[tex]n=\frac{m}{M}[/tex]
Here, m is mass and M is molar mass
Putting the values,
[tex]n=\frac{(4.15 g}{(39.1 g/mol}=0.1061 mol[/tex]
Thus, number of moles of [tex]K_{2}SO_{4}[/tex] will be [tex]0.1061\times 0.5=0.053 mol[/tex].
The volume of solution is 225 mL, converting this into L,
[tex]1 mL=10^{-3}L[/tex]
Thus,
[tex]225 mL=0.225 L[/tex]
Putting the values in equation (1),
[tex]C=\frac{(0.053 mol}{0.225 L}=0.236 M[/tex]
Therefore, concentration of potassium sulfate solution is 0.236 M.
Darwin called this idea of certain traits being selected in order for an organism to reproduce sexual selection. In crickets and frogs, males call to attract mates and females are attracted to superior males by characteristics of their calls. How can this also be a disadvantage to survival of the species? A) Only the superior male traits are passed to the next generation. B) Female choice for mating reflects only the genes of the superior males. C) Calling can be hazardous because it also attracts parasites and predators. D) Inferior males intercept the females from the superior males and mate anyway.
Th correct answer is option C. Calling can be hazardous because it also attracts parasites and predators.
The mating call is used by the males to attract females for sexual reproduction. By using vocal sounds males are not only making themselves attractive to females, they are also making themselves vulnerable to predators.
Thus the mating call can have a disastrous effect on the survival of the species.
Answer: C.
Calling can be hazardous because it also attracts parasites and predators.
Explanation:
how many grams of oxygen is needed to completelt react with of 9.30 of aluminum
Hey there!
Given the reaction:
4 AI + 3O2 ------> 2 AI2O3
4 moles Al --------- 3 moles O2
9.30 moles Al --------- ?? moles O2
9.30 * 3 / 4 => 6.975 moles of O2
Molar mass O2 => 32.0 g
Therefore:
6.975 * 32.0 => 223.3 g of Oxygen
Hope that helps!
Denver wonders if adding salt to water will make it boil at a lower temperature. What should he do next in order to follow the steps of inquiry?
In order to follow the steps of inquiry Denver should add some salt to water taken in vessel and heat it. Once the water comes to a boil, Denver should insert a thermometer into the boiling water and measure the temperature of it. Pure water boils at 100°C. Denver will have to note if the salt water boils at a higher or lower temperature than 100°C.
Answer:
Impurities decrease the boiling point of a liquid, hence the boiling point of the salt solution will be less than that of pure water.
Explanation:
If Denver wants to know if adding salt to water will reduce the boiling point of water, Denver needs to set up the apparatus for the inquiry as follows;
A boiling tube
A Bunsen burner with wire gauze
A thermometer
A test tube holder
The thermometer is placed inside the boiling tube while the salt solution his allowed to boil. The boiling point is observed using the thermometer. Impurities decrease the boiling point of a liquid, hence the boiling point of the salt solution will be less than that of pure water.
Arctic animals often expand their hunting territory during the winter when the ice cap expands to cover more of the ocean surface. What property of water contributes most to their ability to do so?*
Explanation: During winters, there is decrease in temperature which leads to the freezing of water molecules.
The state change occurs from liquid state to solid state.
In case of water, the inter-molecular forces between the molecules decreases which leads to the increase in volume.
Which in turn leads to the decrease in the density of solid (ice). This increase in density tends to the floating of ice on water.
[tex]Density=\frac{Mass}{Volume}[/tex]
Thus, on freezing, the water expands and hence, there will be more space for the arctic animals to hunt in winters.
The distance between happyville and Giggleland is 60 miles. How far is this kilometers
96.56064 is the kilometers for 60 miles.
The distance between Happyville and Giggleland is approximately 96.56 kilometers when converted from miles.
Explanation:To convert distance from miles to kilometers, we utilize the conversion factor of 1 mile = 1.60934 kilometers. Given that the distance between Happyville and Giggleland is 60 miles, you will multiply 60 by 1.60934.
So, Giggleland is approximately 96.56 kilometers from Happyville.
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which of these equations are balance a) 3 H2SO + 2AI = AI2(SO4)3 3H2 b) 2KCI + Pb(NO3)2 = 2KNO3 + PbCI2
Both equations are balanced.
a) 3H₂SO₄ + 2Al ⟶ Al₂(SO₄)₃ + 3H₂
On the left On the right
6H 6H
3S 3S
12O 12O
2Al 2Al
b) 2KCl + Pb(NO₃)₂ ⟶ 2KNO₃ + PbCl₂
On the left On the right
2K 2K
2Cl 2Cl
1Pb 1Pb
2N 2N
6O 6O
A study was done to find it different tire treads affect the braking distance of a car which is independent variable which is a dependent variable and the constant.
The dependent variable is the breaking distance. The independent variable is the tire treads. The constant variable is the type of vehicle.
In an experiment, the independent variable is the variable that is being manipulated and the dependent variable that changes value as the independent variable is manipulated.
In this case, the breaking distance changes as the tire tread changes. This means that changes in the tire tread determines the breaking distance. Thus, the tire tread is the independent variable and the breaking distance is the dependent variable.
The experiment must be performed using the same type of car or vehicle. This is the constant variable.
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The independent variable in a study examining the impact of different tire treads on braking distance is the tire tread condition, while the dependent variable is the braking distance itself. Constants include factors that are kept the same throughout the experiment.
Explanation:In the context of a study aiming to determine whether different tire treads affect the braking distance of a car, the independent variable is the type or condition of the tire treads being tested, because this is what the experiment changes to see its effect. The dependent variable is the braking distance, since it depends on the condition of the tire treads. The constants in such an experiment might include the make and model of the car, the driver, speed at which the brakes are applied, and environmental conditions like weather, if you can control and keep them the same throughout the testing. By maintaining constants, the study can ensure that any changes in the braking distance are likely due to the changes in the tire tread, which is the independent variable.
which atom in each pair has the larger atomic radius Li or K?
Potassium (K) has a larger atomic radius than lithium (Li) because it is located further down in Group 1 of the periodic table, indicating it has more electron shells.
To determine which atom has a larger atomic radius between lithium (Li) and potassium (K), we need to look at the periodic table. Atomic size increases as we move down a group because each successive element has an additional electron shell. Thus, lithium, which is located at the top of Group 1, has fewer electron shells compared to potassium that is found further down the same group.
Lithium is in the second period and contains only two electron shells, while potassium is in the fourth period and contains four electron shells. This additional number of shells in potassium means its electrons are held further away from the nucleus compared to lithium. Therefore, potassium has a larger atomic radius than lithium.
Ben's dog is 2 m^3 and 10 kg/m^3. How many kg is she? Question 2 options: 20
10
0.2
5
The mass of Ben’s dog is 20 kg.
Mass = 2 m³ × (10 kg/1 m³) = 20 kg
Which of the following is true for all chemical reactions? The total mass of the reactants increases. The total mass of the reactants equals the total mass of the products. The total mass of the products is greater than the total mass of the reactants. The total mass of the products is less than the total mass of the reactants.
The total mass of the reactants equals the total mass of the products, because matter is not created or destroyed in the reaction.
solve first image
second image am i correct
other choices
1.fact
2.hypothesis
3.theroy
dropdown 2
1.conduct electricy
2.generate hypothesis
3.hold different opinons
1. Plasma is "the state..." because plasma is rarely natural on earth (only lightning strikes) and has the highest temp
gas is "particles move freely" they do move freely
liquid is "it expands to fill volume" they do not have definite boundaries so they fill up the container
solid is "it retains its shape" yup dis is pretty obvious ig
2.
I agree with your answers.
it wouldnt be hypothesis or theory because they are basically the same thing and they explain facts. fact would be the best answer
conduct experiments would be the most logical here because you can gain new knowledge from conducting experiments instead of the rest.
Atoms are electrically because they have the same number of protons and electrons. A. charged B. neutral
what could JJ Thomson conclude from his experiments?
A. atoms are empty space
B. Most of the mass of the atom is concentrated in the center
C. Atoms must balance positive and negative particles
D. Atoms are indivisible
Answer:
A
Explanation:
JJ Thomson concluded that atoms must balance positive and negative particles.
Explanation:From his experiments, JJ Thomson concluded that atoms must balance positive and negative particles. He proposed a model known as the 'plum pudding' model, in which atoms were described as a positively charged mass with an equal amount of negative charge in the form of electrons embedded in it. This model suggested that atoms are made of thousands of electrons swimming around in a nebulous mass of positive charge.
Substance A undergoes a first order reaction A B with a half- life of 20 min at 25 °C. If the initial concentration of A ([A]◦ ) in a sample is 2.7 M, what will be the concentration of A after 60 min?
The concentration of A will be 0.34 mol·L⁻¹ after 60 min.
In a first-order reaction, the formula for the amount remaining after n half-lives is
[tex]\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\[/tex]
If [tex]t_{\frac{1}{2}} = \text{20 min}\\[/tex]
[tex]n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}[/tex]
∴ [tex]\text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}[/tex]