A constant in any experiment is a variable that remains constant for the entire experiment, this constant helps to identify the other variables of the experiment and come to a conclusion. Here, in this experiment the number of days remains constant for the entire experiment which is 5 days as given in the options. Along with that the type of the plant, water amount, sunlight, 30 days of the whole experiment, and the number of plants remains the same for the entire experiment.
Answer 2) Independent Variable : Option a) length of time of fish stick aging.Explanation:In the experiment the independent variable is the length of the old fish sticks aging , as per the study done by the experimenters the age of the old sticks will produce more compost which will result into taller eggplants. This will be independent of other variables in the experiment, as the decomposition of the fish sticks will be increased by everyday and the quality of the compost will also increase according to it, which will also produce taller eggplants. Here, the independent variables are 3, 6, 12 months .
Answer 3) Hypothesis : Option D) older fish stick compost will produce taller eggplants Explanation:The experiment which is considered for proving the hypothesis is that older fish sticks will give good quality of compost that will result into high production of taller eggplants. This will be supported by the experimental results by different individuals.
Answer 4) Dependent Variable : Option b)Growth of the eggplant.Explanation :The growth of eggplant is the dependent variable in this experiment as it will be greatly influenced by other variables of the experiment. The variable which depends on other factors of experiment is called as the dependent variable. Here, in this case the height i.e. growth of th eggplant is the dependent variable which will be the result of other varying factors of the controlled experiment.
How many hydrogen atoms are in 2.30 mol of ammonium sulfide
1] Find out how many moles
2] Use Avagadro's number to find number of molecules
1] [2.3 g (NH4)2SO4] x [1 mol (NH4)2SO4] / [132.14g(NH4)2SO4 )] = 0.017406 moles (NH4)2SO4
2] 0.017406 moles x 6.022 x 10^23 molecules/mole = 1.05 x 10^21 molecules (NH4)2SO4
A board has a mass of 750 g. If you ground the whole board down to sawdust, what would be the mass of the pile of sawdust?
The law of conservation of mass states that mass can neither be created nor destroyed. For example in an isolated system, mass of the reactants is equal to the mass of the products. Thus, mass or the quantity of the system under consideration will remain unchanged through any physical or chemical process.
In the given example, the board initially has a mass of 750 g. It is physical transformed to sawdust by grinding. Based on the conservation of mass, the pile of sawdust would still weigh 750 g.
Jon performs the following calculation. (1)(2.0)(3.00)(4.000) Which value from his calculation most strongly affects the number of significant figures in the answer?
Jon should report his answer to one significant digit only.
When several numbers are multiplied, the number of significant digits in the final answer is determined by the number that has the least number of significant digits.
In this case, 1 has only one significant digit, whereas 2.0 has two, 3.00 has three, and 4.000 has four significant digits. Hence, 1 strongly affects the number of significant figures in the answer.
Answer: A. for those who dont like to read
Explanation:
help me nowww please and thanks
The answer to your question is Gallium, or GA. The trick is to always check if they are along the same vertical column. This indicates that they have the same Valence electrons, which is involved in all the bonding and define the electronegative status of the atom.
Remark
I can't understand why this was reported. It's a perfectly straight forward question, unless someone recognized it as part of a test.
I know that the answer is supposed to be Ga, but in many ways Boron resembles Carbon than it does Ga. Be that as it may, the answer you want is Ga.
Which process must occur for a muscle to be able to relax? A. The concentration of calcium in the myofibril must decrease. B. The amount of ATP in the neuromuscular junction must increase. C. a nerve must initiate an action potential in the muscle fiber. D. Myosin and actin must attach to each other.
The correct option is A. which is the concentration of calcium in the myofibril must decrease.
Explanation:Calcium allows the actin, myosin, and ATP to interact, causing cross bridge formation and muscle contraction. Muscle relaxation occurs when calcium is pumped back into the sarcoplasmic reticulum, away from the actin and myosin. When calcium moves in this way, the actin and myosin cannot interact, and the muscle relaxes.So according to above information all option are wrong except A option.Consider the reaction.

At equilibrium, the concentrations of the different species are as follows.
[H2O] = 0.077 M
[Cl2O] = 0.077 M
[HClO] = 0.023 M
What is the equilibrium constant for the reaction at this temperature?
0.089
0.26
3.9
11
Answer:
0.089.
Explanation:
For the equilibrium reaction:Cl₂O + H₂O ⇄ 2HClO,
Kc = [HClO]²/[Cl₂O][H₂O].
[H₂O] = 0.077 M , [Cl₂O] = 0.077 M , [HClO] = 0.023 M.
∴ Kc = [HClO]²/[Cl₂O][H₂O] = (0.023 M)²/(0.077 M)(0.077 M) = 0.08922 ≅ 0.089.
Answer:
A
Explanation:
It told me
Electron A falls from energy level X to energy level Y and releases blue light. Electron B falls from energy level Y to energy level Z and releases red light. Which transition, from X to Y or from Y to Z, has a greater energy difference? Explain your answer and how you arrived at it. Use a diagram of the electromagnetic spectrum.
Answer: Transition from X to Y will have greater energy difference.
Explanation: For studying the energy difference, we require Planck's equation.
[tex]E=\frac{hc}{\lambda}[/tex]
where, h = Planck's Constant
c = Speed of light
E = Energy
[tex]\lambda[/tex] = Wavelength of particle
From the equation, it is visible that the energy and wavelength follow inverse relation which means that with low wavelength value, energy will be the highest and vice-versa.
As electron A falls from X-energy level to Y-energy level, it releases blue light which has low wavelength value (around 470 nm) which means that it has high energy.
Similarly, Electron B releases red light when it falls from Y-energy level to Z-energy level, which has high wavelength value (around 700 nm), giving it a low energy value.
Energy Difference between X-energy level and Y-energy level will be more.
When two plates with continental crust converge, why are neither of them subducted
Neither plate subducts because the crust have approximately the same density. Instead, the rocks are smashed together causing them to recrystallize due to the intense heat and pressure from the colliding plates.
An unknown substance has hydrogen ion concentration of [H+]=3.1*10^-8M. Find the pH and classify the substance as acidic or basic
pH = 7.51. The substance is basic.
[H⁺] = 3.1 × 10⁻⁸ mol·L⁻¹.
pH = -log[H⁺] = -log(3.1 × 10⁻⁸) = 7.51
The substance is basic because pH > 7.
Final answer:
The pH of the substance with a hydrogen ion concentration of 3.1*10^-8M is 7.51, indicating that the solution is basic.
Explanation:
The pH of a substance can be calculated using the formula pH = -log[H+], where [H+] is the concentration of hydrogen ions in moles per liter (M). Given that the hydrogen ion concentration of the unknown substance is [H+]=3.1*10^-8M, we can calculate the pH as follows:
pH = -log(3.1*10^-8)
pH = 7.51
As the pH is higher than 7, the substance is classified as basic.
Alfred wegener suggested that earths continents are moving. Which evidence support this theory
Close geometric correspondence of continental coastlines.
Explanation:The main supporting clues that Wegener used were the geomorphological shape of the opposing continents across the Atlantic. Further evidence derived from the study of the continental shelf below the sea; the matching geometry is even better than the one of the emerged shoreline.Another strong supporting evidence is the presence of rocks of identical geological origin on different continents. It is actually possible to follow the strata limits on landmasses that now are separated by oceans. It is a strong clue that once these masses belonged to the same continent.Answer:
As explained below
Explanation:
Alfred Wegener was the first to give the continental plate theory in 1912 and IT gained popularity in 1950 onwards when the publication came from the geologist and other scientists that proved that continent are spreading and as seafloor is itself moving and the evidence that he gave doe the theory are given as below.1. Drifting away from the continents due to the pole wandering forces.
2. Jigsaw ft puzzle that coasts of South America and those of Africa have the same geologic and tectonic origin.
3. Presence of large and long mountain chains of mountains and ranges present in all the contents that form a chain.
4. Floral and Faunal evidence found in the lands of South America and Africa and the opening of the s-shaped Atlantic ocean that separated them apart.
5. Presence of similar climatic zones over the continents of the Gondwanaland and the northern Laurentia continent.
The seafloor spreading supports the evidence by the study of paleomagnetism and the age of rocks.On a potential energy diagram, what is true about activation energy?
Activation energy is the same for both endothermic and exothermic reactions.
Activation energy is greater for endothermic reactions.
Activation energy is greater for exothermic reactions.
Activation energy is represented by a negative slope.
Why hello there!
The correct answer to your question is C because exothermic energy is based of on using heat and heat acts like the activation !
If my answer helped please mark me as brainliest i really want to rank up thank you and have the best day ever!
Answer:
I think the answer is B
Identify three areas of energy research that scientists are working on today.
Answer:
wind, solar, bioproduction
Explanation:
The wind energy, since in some places the wind reaches fast velocities, the scientist try to implement new technology to improve how to convert wind energy in electricity for example.
The solar energy, even we have by now the solar panels, there is still an area to research to obtain again the mayor quantity of energy with less materials.
The bioproduction, since the mammals we produce liquid and solid wastes, how to convert it into energy like gas, electricity, etc.
An atom’s lewis dot structure has two dots, which element could it be, and why?
Final answer:
An atom's Lewis dot structure with two dots indicates that it is Helium (He), which has two valence electrons in its outermost shell, achieving a stable electronic arrangement and typically not forming chemical bonds.
Explanation:
An atom’s Lewis dot structure with two dots indicates it has two valence electrons. The element that fits this description is Helium (He). The number of dots around an element's Lewis symbol represents its valence electrons, which are crucial for forming chemical bonds. Helium's electron configuration is 1s2, meaning it has two electrons in its outermost shell, both of which are depicted as dots in its Lewis dot structure. This structure is a visually simple method to represent valence electrons and predict bonding behavior. Helium, with its two valence electrons completely filling its first and only energy level, achieves a stable electronic arrangement, thus typically does not form chemical bonds with other elements.
Final answer:
An atom's Lewis dot structure with two dots likely represents helium (He), as the number of dots indicates valence electrons, and helium has two valence electrons, completing its outer shell.
Explanation:
An atom's Lewis dot structure with two dots could represent the element helium (He). This is because the number of dots in a Lewis dot structure indicates the number of valence electrons an atom has. Helium is in Group 18 of the periodic table, which is known as the noble gases. These elements are characterized by having a full outer shell of electrons. For helium, which is in the first period of the periodic table, having two valence electrons fills its outer shell, as it only has one shell. Therefore, its Lewis dot structure is represented with two dots, signifying its two valence electrons.
Which molecules shown on the graph above are likely candidates for evaporation?
1. molecules under the left end of the curve
2. molecules under the apex of the curve
3. molecules under the right end of the curve
4. all molecules under curve "T2"
Answer : The correct option is, (3) molecules under the right end of the curve
Explanation :
Evaporation : It is type of process in which the phase changes from liquid state to gaseous state below the boiling temperature of the liquid.
As we know that the higher the temperature of the liquid [tex](T_2)[/tex], the more will be the molecule escaping into the gaseous phase than the lower temperature [tex](T_1)[/tex].
So, the molecules under the right end of the curve are likely candidates for evaporation.
Hence, the correct option is, (3)
Answer: molecules under the right end of the curve
Explanation: smart
Which element is oxidized in the following reaction: CuO(s) + H2 (g) → Cu(s) + H2O (l)
Start by determining the oxidation numbers of each element on both sides of the equation CuO(s) + H2 (g) → Cu(s) + H2O (l)
Let's start with the reactants.
In the compound CuO(s), the oxidation number of O is -2 and the oxidation number of Cu is +2. (Remember, oxygen's oxidation number is -2 unless it's in a peroxide)
In H2(g) the oxidation number of H is 0 because it is in its elemental form.
Now onto the products
The oxidation number of Cu(s) is 0 because it is in its elemental form
In H2O(l) the oxidation number of oxygen is -2, and the oxidation number of H is +1.
Now let's summarize the change in the oxidation numbers of each element.
Cu: started as +2 and became 0
O: started as -2 and became -2 (didn't change)
H: started as 0 and became +1
To determine which element was oxidized, we look at which element lost electrons, and thus became more positive. So, we can determine that H was oxidized in this reaction, because it started with the oxidation number 0 and became +1.
Answer: you are a god
Explanation:
25pts! which of the following has the largest atomic radius mg mg2+ ca or ca2+
Ca has the largest atomic radius because it is further down the periodic table than Mg, and its cation, Ca²⁺, is still larger than Mg²⁺ because it retains an extra shell of electrons.
The atomic radius tends to increase as you move down a group in the periodic table because each successive element has an additional energy level, or shell. Conversely, atomic radius generally decreases as you move from left to right across a period because the effective nuclear charge increases, pulling the electrons closer to the nucleus. In the case of ions, cations (positively charged ions) are smaller than their neutral atoms because they have lost one or more electrons, reducing electron-electron repulsion and allowing the electrons to be pulled closer to the nucleus.
In comparing Mg, Mg²⁺, Ca, and Ca²⁺, we must remember that the neutral atoms will have a larger atomic radius than their respective cations. Between Mg and Ca, Ca is larger because it is lower on the periodic table. However, for the cations, Ca²⁺ is larger than Mg²⁺ because even though they have both lost two electrons, the calcium ion still has an additional shell of electrons compared to magnesium.
Therefore, among the given species, Ca has the largest atomic radius followed by Mg, then Ca²⁺, and finally Mg²⁺ having the smallest atomic radius.
Answer: ca
Explanation: .
What are the natural components of water?
two hydrogen atoms and one oxygen atom. hope this helped.
How can we increase the rate of collisions between the reactants in this reaction?
Mg + 2HCl → MgCl2 + H2
A.
Increase the concentration of H2 in the reaction mixture.
B.
Decrease the temperature of the reactants in the reaction mixture.
C.
Increase the concentration of Mg in the reaction mixture.
D.
Decrease the temperature of the entire reaction mixture.
E.
Decrease the concentration of HCl in the reaction mixture.
Answer: Option (C) is the correct answer.
Explanation:
According to collision theory, more is the number of collision between the reactant molecules more will be the rate of reaction.
For example, [tex]Mg + 2HCl \rightarrow MgCl_{2} + H_{2}[/tex]
When we increase the concentration of reactants then it means there is increase in number of molecules. Hence, more is the number of molecules more will be the number of collisions.
Thus, we can conclude that by increasing the concentration of Mg in the reaction mixture we increase the rate of collisions between the reactants in this reaction.
Answer:
C. Increase the concentration of Mg in the reaction mixture.
Explanation:
A student mixes four reagents together, thinking that the solutions will neutralize each other. The solutions mixed together are 50.0 ml of 0.100 m hydrochloric acid, 100.0 ml of 0.200 m of nitric acid, 500.0 ml of 0.0100 m calcium hydroxide, and 200.0 ml of 0.100 m rubidium hydroxide. Is the resulting solution neutral? If not, calculate the concentration of excess h or oh? Ions left in solution.
Answer: Resulting solution will not be neutral because the moles of [tex]OH^-[/tex]ions is greater. The remaining concentration of [tex][OH^-][/tex]ions =0.0058 M.
Explanation:
Given,
[HCl]=0.100 M
[tex][HNO_3][/tex] = 0.200 M
[tex][Ca(OH)_2][/tex] =0.0100 M
[RbOH] =0.100 M
Few steps are involved:
Step 1: Calculating the total moles of [tex]H^+[/tex] ion from both the acids
moles of [tex]H^+[/tex] in HCl
[tex]HCl\rightarrow {H^+}+Cl^-[/tex]
if 1 L of [tex]HCl[/tex]solution =0.100 moles of HCl
then 0.05L of HCl solution= 0.05 [tex]\times [/tex]0.1 moles= 0.005 moles (1L=1000mL)
moles of [tex]H^+[/tex] in HCl = 0.005 moles
Similarliy
moles of [tex]H^+[/tex] in [tex] HNO_3[/tex]
[tex]HNO_3\rightarrow H^++NO_3^-}[/tex]
If 1L of [tex]HNO_3[/tex] solution= 0.200 moles
Then 0.1L of [tex]HNO_3[/tex] solution= 0.1 [tex]\times [/tex] 0.200 moles= 0.02 moles
moles of [tex]H^+[/tex] in [tex]HNO_3[/tex] =0.02 moles
so, Total moles of [tex]H^+[/tex] ions = 0.005+0.02= 0.025 moles .....(1)
Step 2: Calculating the total moles of [tex][OH^-][/tex] ion from both the bases
Moles of [tex]OH^-\text{ in }Ca(OH)_2[/tex]
[tex]Ca(OH)_2\rightarrow Ca^2{+}+2OH^-[/tex]
1 L of [tex]Ca(OH)_2[/tex]= 0.0100 moles
Then in 0.5 L [tex]Ca(OH)_2[/tex] solution = 0.5 [tex]\times [/tex]0.0100 moles = 0.005 moles
[tex]Ca(OH)_2[/tex] produces two moles of [tex]OH^-[/tex] ions
moles of [tex]OH^-[/tex] = 0.005 [tex]\times [/tex] 2= 0.01 moles
Moles of [tex]OH^-[/tex] in [tex]RbOH[/tex]
[tex]RbOH\rightarrow Rb^++OH^-[/tex]
1 L of RbOH= 0.100 moles
then 0.2 [RbOH] solution= 0.2 [tex]\times [/tex] 0.100 moles = 0.02 moles
Moles of [tex]OH^-[/tex] = 0.02 moles
so,Total moles of [tex]OH^-[/tex] ions = 0.01 + 0.02=0.030 moles ....(2)
Step 3: Comparing the moles of both [tex]H^+\text{ and }OH^-[/tex] ions
One mole of [tex]H^+[/tex] ions will combine with one mole of [tex]OH^-[/tex] ions, so
Total moles of [tex]H^+[/tex] ions = 0.005+0.02= 0.025 moles....(1)
Total moles of [tex]OH^-[/tex] ions = 0.01 + 0.02=0.030 moles.....(2)
For a solution to be neutral, we have
Total moles of [tex]H^+[/tex] ions = total moles of [tex]OH^-[/tex] ions
0.025 moles [tex]H^+[/tex] will neutralize the 0.025 moles of [tex]OH^-[/tex]
Moles of [tex]OH^-[/tex] ions is in excess (from 1 and 2)
The remaining moles of [tex]OH^-[/tex] will be = 0.030 - 0.025 = 0.005 moles
So,The resulting solution will not be neutral.
Remaining Concentration of [tex]OH^-[/tex] ions = [tex]\frac{\text{Moles remaining}}{\text{Total volume}}[/tex]
[tex][OH^-]=\frac{0.005}{0.85}=0.0058M[/tex]
1. Define fission and fusion. Give an example of fission and fusion reflecting in real life application.
Answer :
Nuclear fission : In nuclear reaction, the nucleus of a larger atom breaks into two or more smaller nuclei. In fission process, protons and neutrons are produced and larger amount of energy is released.Example : In nuclear power plant, the energy released from the process of nuclear fission which is converted into electrical energy that is used in our homes and factories.
Nuclear fusion : In nuclear reaction, the nuclei of two or more smaller atoms combine together to form single larger molecule. In fusion process, the mass of the resulting nuclei is more as compared to the starting nuclei and large amount of energy is also released.Example : This process occurs in the sun and stars. In this, the isotopes of Hydrogen, Tritium and Deuterium combine together to form a neutron and a helium atom under high pressure and temperature.
Classify the properties based on whether they describe metals or nonmetals. They are good conductors of heat and electricity. They are brittle and break into sharp pieces. They are flexible and can be made into wires. They are mostly solids at room temperature. They are poor conductors of heat and electricity. They are solids, liquids, or gases at room temperature. Reset Next
Classified based on the properties of metals
They are good conductors of heat and electricityThey are mostly solids at room temperatureThey are flexible and can be made into wiresClassified based on the properties of nonmetals.
They are brittle and break into sharp piecesThey are poor conductors of heat and electricityThey are solids, liquids, or gases at room temperatureWhat are metals and non-metals?Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances.The metals of antiquity are the seven metals that humans had identified and found use for in prehistoric times: gold, silver, copper, tin, lead, iron, and mercury.Aluminum, cadmium, chromium, copper, iron, lead, nickel, tin, zinc, or any combination of these elements are considered common metals.Non-metals are natural materials that do not produce heat or electricity and that are structurally brittle (can not be easily rolled, molded, extruding, or pressed). Hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic, and selenium are the non-metallic elements in the periodic table.To learn more about metals and nonmetals refer:https://brainly.com/subject/chemistry
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Answer: I just took the test and it was right!
Explanation:
What is the mass in grams of 100 atoms of carbon?
(Enter the number in scientific notation with units!)
Hello!
To find the mass in grams of 100 atoms of carbon, we need to use Avogadro's number, which is 6.02 x 10^23 grams, and divide that by the total number of atoms.
Next, we would need to find how much one mole of carbon weighs. In this case, it is exactly 12 grams.
1. Divide by Avogadro's number
100 / (6.02 x 10^23) ≈ 1.66 x 10^-22
2. Multiply by one mole of carbon
(1.66 x 10^-22) x 12 ≈ 2.0 x 10^-21
Therefore, the mass of 100 atoms of carbon is equal to about 2.0 x 10^-21 grams.
How many hydrogen atoms are in 6.90 mol of ammonium sulfide?
(NH4)2S this is chemcial formula of ammonium sulfide
in 1 mole of ammonium sulfide there are 4*2 = 8 moles of H atoms are present
but in 0.69 moles of ammonium sulfide = 8 * 0.69 = calculate it
Answer : The number of atoms of hydrogen are [tex]3.32\times 10^{25}[/tex]
Explanation : Given,
Moles of ammonium sulfide = 6.90 moles
The chemical formula of ammonium sulfide is, [tex](NH_4)_2S[/tex]
In ammonium sulfide, there are 2 atoms of nitrogen, 8 atoms of hydrogen and 1 atom of sulfur.
As we know that,
1 mole of substance always contains [tex]6.022\times 10^{23}[/tex] number of atoms.
As, 1 mole of ammonium sulfide contains [tex]8\times 6.022\times 10^{23}[/tex] number of hydrogen atoms
So, 6.90 mole of ammonium sulfide contains [tex]6.90\times 8\times 6.022\times 10^{23}=3.32\times 10^{25}[/tex] number of hydrogen atoms.
Therefore, the number of atoms of hydrogen are [tex]3.32\times 10^{25}[/tex]
The burning of the magnesium becomes uncontrolled (it burns brightly). oops! will the reported mole ratio of magnesium to oxygen be too high or too low as a result of this technique error? explain.
Answer:
The answer is Less oxidation will happen while its consuming, so the proportion to O² to magnesium would be substantially higher than common.
Explanation:
At the point when decrease happens, a component picks up electrons and its oxidation number declines or is diminished. To decide whether a red ox response has happened and to distinguish the component oxidized and the component decreased: Assign oxidation numbers to all iotas in the equation.In ionic and free extreme responses, oxidation and decrease are characterized as procedures by which a component experiences a net misfortune or gain of electrons, separately. ... In reference to natural particles, oxidation is a procedure by which a carbon iota picks up bonds to more electromotive components, most usually oxygen.
Uncontrolled burning of magnesium leads to more oxygen being consumed than that needed for a perfect stoichiometric reaction. Hence, this would result in the mole ratio of magnesium to oxygen to be reported lower than it would be if the magnesium burning was controlled. The reaction with other substances like nitrogen or carbon dioxide can also influence the mole ratio.
Explanation:If magnesium burns uncontrolled, it will consume more oxygen than required for the stoichiometric reaction with magnesium. As a result, the mole ratio of magnesium to oxygen will be reported lower than it actually is. In the reaction 2Mg(s) + O2(g) → 2MgO(s), one mole of oxygen reacts with two moles of magnesium. However, if magnesium burns uncontrollably, it will react with more than the required amount of oxygen.
Thus, an abundance of oxygen implies a decrease in the mole ratio of magnesium to oxygen. Apart from this, an uncontrollable burning of magnesium might lead to its reaction with nitrogen or carbon dioxide, which can further lower the reported mole ratio of magnesium to oxygen.
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How does chromatography separate substances
Chromatography is actually a way of separating out a mixture of chemicals, which are in gas or liquid form, by letting them creep slowly past another substance, which is typically a liquid or solid. ... As the mobile phase moves, it separates out into its components on the stationary phase
Answer:
Chromatography is really a method for isolating out a blend of synthetics, which are in gas or fluid shape, by giving them a chance to crawl gradually past another substance, which is regularly a fluid or strong.
Explanation:
Chromatography can be utilized to isolate blends of hued mixes. Blends that are reasonable for division by chromatography incorporate inks, colors and shading operators in nourishment. Basic chromatography is completed on paper. ... Diverse parts of the blend will move at various rates.There are four primary sorts of chromatography. These are Liquid Chromatography, Gas Chromatography, Thin-Layer Chromatography and Paper Chromatography. Fluid Chromatography is utilized on the planet to test water tests to search for contamination in lakes and waterways.
What kind of reactions provide a star with energy?
The nuclear fusion reaction is the source of energy in a star. In nuclear fusion reactions, the nuclei of two atoms combine to create a new atom with the release of a lot of energy. The nuclear fusion reaction takes place in the core of the star where two hydrogen atoms fuse to become one helium atom.
²₁H + ³₁H --> ⁴₂He + ¹₀n + 17.59 MeV
In the fusion reaction above deuterium fuses with tritium to form helium and releases ~18 mega electron volt of energy.
Which of these accurately describes the products of a reaction?
Question 2 options:
new substances that are present at the end of a reaction
substances that were not used up in a reaction
substances that are used in a reaction
substances that do not participate in a reaction
Out of the following, which element has properties of both metal and nonmetal?
A.
Ce
B.
Be
C.
Te
D.
Ne
1. Find the elements magnesium, cesium, and nitrogen on the periodic table. a. What monoatomic ions would each form? Write this with the appropriate symbol abbreviation. Be sure to use subscripts or superscripts as necessary. Example: Al3+ (5 points) b. Then, given what you know about chemical bonding, give the formulas for the types of ionic compounds they would produce with each other. Be sure to use subscripts or superscripts as necessary. Explain how you determined this. No credit without an explanation. (10 points)
a. Monatomic ions
Cs is in Group 1. It has one valence electron that it can lose to form a Cs⁺ ion.
Mg is in Group 2. It has two valence electrons that it can lose to form an Mg²⁺ ion.
N is in Group 15. It can gain three valence electrons to complete its octet and form an N³⁻ ion.
b. Ionic compounds
In an ionic compound there must be the same number of positive and negative charges.
It takes three Na⁺ ions to balance the charge on one N³⁻ ion, so the formula of sodium nitride is Na₃N.
It takes three Mg²⁺ ions (charge = +6) to balance the charge on two N³⁻ ions
(charge = -6), so the formula of magnesium nitride is Mg₃N₂.
Magnesium forms a Mg²⁺ cation, cesium forms a Cs⁺ cation, and nitrogen forms an N³⁻ anion. Magnesium nitride, cesium nitride, and magnesium ceside are the ionic compounds formed, with formulas Mg₃N₂, Cs₃N, and MgCs₂, respectively. Ionic compounds must have balanced total charges.
1. (a). First, let's identify the ions that each element forms:
Magnesium (Mg) is in Group 2 of the periodic table and forms a cation by losing two electrons: Mg²⁺. Cesium (Cs) is in Group 1 and forms a cation by losing one electron: Cs⁺. Nitrogen (N) is in Group 15 and forms an anion by gaining three electrons: N³⁻.
1. (b). Next, let's determine the formulas of the ionic compounds these ions can form:
Magnesium Nitride (Mg₃N₂): Magnesium (Mg²⁺) and nitrogen (N³⁻) combine in a 3:2 ratio to balance the total charges.Cesium Nitride (Cs₃N): Cesium (Cs⁺) and nitrogen (N³⁻) combine in a 3:1 ratio to balance the total charges.Magnesium Ceside (MgCs₂): Magnesium (Mg²⁺) and cesium (Cs⁺) combine in a 1:2 ratio to balance the total charges.To determine the formulas, I considered the need for ionic compounds to be electrically neutral, meaning the total positive and negative charges must equal zero.
How do the major and minor scale divisions relate the precision of measurements taken with a metric ruler or graduated cylinder?
Answer: Major scale and minor scale both relate the precision of measurements with more true value of measurement.
Explanation:
Major scale in a measuring device is maximum unit value on the scale that can be measured.
Minor scale in a measuring device is a least unit value on the scale that can be measured.
In a metric ruler major scale is 1 cm and minor scale is 0.1 mm which means one can measure accurate value up-to one decimal point and in 10 ml of graduated cylinder major scale division is 1 ml minor scale division is 0.01.