Answer:
Each time an excited helium atom falls back from an excited state to its ground state or to a lower energy state, it emits a photon of radiation that shows up as this specific line-emission spectrum.
Explanation:
Help asap, A student produced this results table to show the reactivity of the halogens. Explain what the results show.
Explanation:
The results shows the reactivity of the halogens and how they displace one another from any solution of their compounds.
The oxidizing power of the halogens decreases from top to down on the group. This explains why the more powerful oxidizing halogens displaces the less powerful one from simple salts.
We see that chlorine is able to displace Bromine and iodine
Bromine is only able to displace Iodine
Iodine cannot displace bromine or chlorine
Plz help asap What can you conclude about the iron(ii) and iron(iii) ions?
Answer:
The chemistry of iron is dominated by the +2 and +3 oxidation states i.e. iron(II) and iron(III) complexes e.g. Fe2+ and Fe3+ complex ions with selected ligands, usually of an octahedral shape, a few tetrahedral iron(III) complexes are mentioned too. The reactions of the aqueous ions iron(II) and iron(III) with ammonia, sodium hydroxide and sodium carbonate are described and explained as are complexes of iron(III) with the chloride ion and cyanide ion.
principal oxidation states of iron, redox reactions of iron, ligand substitution displacement reactions of iron, balanced equations of iron chemistry, formula of iron complex ions, shapes colours of iron complexes, formula of compoundsExplanation:
The products of chemical industries that are used to care for the skin and make people look more attractive are
Answer:
Cosmetics
Explanation:
The products of chemical industries that are sued to care for the skin and make people more attractive are cosmetics.
Cosmetics are chemical products used for beauty enhancement.
A broad range of materials or substances are generally grouped as cosmetics. They are often classified as health and beauty products. To make cosmetics, some natural products are used in combination with artificial materials that have synthesized. Examples are deodorants, perfumes, lip stick, lip gloss etc.“An electron is found only in specific energy levels around the nucleus of the atom.”
what is the evidence
Answer:
Hibhibihbhubhibhbuhbuhbhub
Explanation:
1.004 mol Arsenic is how many atoms?
Answer: [tex]6.047\times 10^{23}[/tex] atoms in 1.004 mol of arsenic
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the atoms, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}[/tex]
[tex]1.004=\frac{x}{6.023\times 10^{23}}[/tex]
[tex]x=1.004\times 6.023\times 10^{23}=6.047\times 10^{23}[/tex]
Thus there are [tex]6.047\times 10^{23}[/tex] atoms in 1.004 mol of arsenic
A company develops a new synthetic product and prepares to sell it to the public. Customers ask questions about how to properly dispose of the product. Which word is related to disposal? A. cost B. performance C. productivity D. profitability E. recyclability
Answer:
recyclability
Explanation:
recyclability
Explanation:
hope this helps
Wood burning has a ___________ (physical or chemical) property of _________ because... helpppp
Answer:
Wood burning would be a chemical change
Explanation:
You cannot undo the change, since the burn will be permanent.
(Hope this helps! If it does not try specifying)
Help if you can please.
Answer:
I think it's Nuclear
HELP!!
CaCO3(s) + 2HCl(aq) CaCl2(aq) + H2O( ) + CO2
(g)
What is the total number of moles of CO2 formed
when 20. moles of HCl is completely consumed?
A) 5.0 mol B) 10. mol
C) 20. mol D) 40. mol
The total number of moles of CO2 formed : 10
Further explanation
Given
Reaction
CaCO3(s) + 2HCl(aq) ⇒CaCl2(aq) + H2O( ) + CO2 (g)
20. moles of HCl
Required
moles of CO2
Solution
The reaction coefficient in the chemical reaction equation shows the mole ratio of the elements in the reactants and products
From the equation, mol ratio of HCl : CO2 = 2 : 1, so mol CO2 :
= 1/2 x mol HCl
= 1/2 x 20
= 10 moles
helpppppp plzzzzz lol
I belive it is A. or B. because During the day it gets really hot and during the night it gets really cold. Mercury has no tilt, so its seasons are caused by its highly elliptical path around the Sun. Venus is the second closest planet to the Sun. Its orbit does not cause the seasons because it is nearly circular.
Answer:
I am guessing B, but I am not so sure.
Explanation:
And could luck in NWEA tests. They are so annoying.
can someone please help me, i'll give you a 5 star rating and brainliest answer
Which substance has a melting point greater than room temperature
O A. argon
O B. oxygen
O
C. mercury
O D. aluminum
Aluminum is solid at room temperature and will, therefore, have a melting point that is above room temperature.
Melting pointThe room temperature is about 25 degrees Celsius.
Argon and oxygen are gases at room temperature.
Mercury is a liquid at room temperature.
Aluminum, on the other hand, is solid at room temperature. Hence, its melting point is definitely somewhere above room temperature.
More on melting points can be found here: https://brainly.com/question/25777663
___co+__ Na2s--> ___ Na+ ___ cos2
Answer: [tex]Co+2Na_2S\rightarrow 4Na+CoS_2[/tex]
Explanation:
According to law of conservation of mass, mass can neither be created nor be destroyed. The atoms on the reactant side must be equal to the number of atoms on the product side so that the mass remains the same on reactant and product side. Thus the reactions are balanced.
Single displacement reaction is one where a more reactive element replaces the lesser reactive one.
The balanced chemical reaction will be:
[tex]Co+2Na_2S\rightarrow 4Na+CoS_2[/tex]
The concept of energy can be calculated in multiple ways. Which units are used for energy? Check all that apply.
Answer:
NEWTONS,
Explanation:
Answer:
kilogram meters2/seconds2
joules
kilojoules
Explanation:
How many carbon atoms are represented by the model below?
Answer:
3
Explanation:
"30 mph north" is an example of:
O velocity
speed
distance
O displacement
Answer:
distance velocity displacement, all three
Explanation:
2Mg + O2 → 2MgO
If you are burning 5.8332 g of Mg, how many grams of MgO will this make?
9.6724 g MgO
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Stoichiometry
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] 2Mg + O₂ → 2MgO
[Given] 5.8332 g Mg
Step 2: Identify Conversions
[RxN] 2 mol Mg = 2 mol MgO
Molar Mass of Mg - 24.31 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of MgO - 24.31 + 16.00 = 40.31 g/mol
Step 3: Stoichiometry
Set up: [tex]\displaystyle 5.8332 \ g \ Mg(\frac{1 \ mol \ Mg}{24.31 \ g \ Mg})(\frac{2 \ mol \ MgO}{2 \ mol \ Mg})(\frac{40.31 \ g \ MgO}{1 \ mol \ MgO})[/tex]Multiply/Divide: [tex]\displaystyle 9.67241 \ g \ MgO[/tex]Step 4: Check
Follow sig fig rules and round. We are given 5 sig figs.
9.67241 g MgO ≈ 9.6724 g MgO
Answer:
9.6730
Explanation:
i just did the quiz
1. What's the difference between a proton and a positively charged hydrogen ion?
Answer:
Theoretically not directly describing, .Atoms vs Ions an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion. When an ion is formed, the number of protons does not change.
Neutral atoms can be turned into positively charged ions by removing one or more electrons. A neutral sodium atom, for example, contains 11 protons and 11 electrons. By removing an electron from this atom we get a positively charged Na+ ion that has a net charge of +1.
Atoms that gain extra electrons become negatively charged. A neutral chlorine atom, for example, contains 17 protons and 17 electrons. By adding one more electron we get a negatively charged Cl- ion with a net charge of -1.
The gain or loss of electrons by an atom to form negative or positive ions has an enormous impact on the chemical and physical properties of the atom. Sodium metal, for example, which consists of neutral sodium atoms, bursts into flame when it comes in contact with water. Neutral chlorine atoms instantly combine to form Cl2 molecules, which are so reactive that entire communities are evacuated when trains carrying chlorine gas derail. Positively charged Na+ and negatively charged Cl- ions are so unreactive that we can safely take them into our bodies whenever we salt our food.
Explanation:
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4. Why is it important to neutralize an acid spill
before attempting to clean it up?
Answer:
It the acid easier to handel
Consider the following reaction:
10 KCIO3 + 3 P4 → 3 P4010 + 10 KCI
Given 30 moles of P4 and 86 moles of KCIO3, which would act as the limiting reactant?
Answer: [tex]KClO_3[/tex] is the limiting reactant in the given reaction.
Explanation:
Limiting reagent is defined as the chemical specie which gets totally consumed in the reaction and the formation of product is dependent on this reagent.
We are given:
Moles of [tex]P_4[/tex] = 30 moles
Moles of [tex]KClO_3[/tex] = 86 moles
The given chemical equation follows:
[tex]10KCIO_3+3P_4\rightarrow 3P_4O_{10}+10KCI[/tex]
By Stoichiometry of the reaction:
If 10 moles of [tex]KClO_3[/tex] reacts with 3 moles of [tex]P_4[/tex]
Then, 86 moles of [tex]KClO_3[/tex] will react with = [tex]\frac{3}{10}\times 86=25.8moles[/tex] of [tex]P_4[/tex]
As, given amount of [tex]P_4[/tex] is more than the required amount. So, it is considered as an excess reagent.
Therefore, [tex]KClO_3[/tex] is considered as a limiting reactant because it limits the formation of product.
Describe the processes that have led to the formation of the soufriere hills volcano
Answer:
The Soufriere Hills volcano has formed where magma is actively seeping up from the mantle to the surface. Soufriere Hills volcano is part of an island chain that formed at the boundary where two oceanic plates converge. One plate subducts beneath the plate with the island chain, and the subducting plate melts in the mantle and creates magma that rises and fuels the Soufriere Hills volcano.
Explanation:
How many protons, neutrons, and electrons are present in an atom of zinc, Zn, with a mass
number of 65?
What is the correct number of digits to express a measurement
Answer:
Examples of measured numbers: The diameter of a coin, such as 10.2 mm. The weight of an object, such as 8.887 grams. The length of a pen, such as 12 cm.
Explanation:
Answer:
It completely depends on what you are measuring, what instrument you are using, and the uncertainty associated with your measurement.
Explanation:
When expressing a measurement, there is always going to be a part that you know, and a part that you guess. They both make up known numbers collectively called significant figures (commonly shortened to "sig figs"). For instance, imagine you are measuring the length of a pencil. Let's say it is a typical ruler with divisions of 0.1 cm (picture for reference). You measure the pencil, and to your eyes it looks like it is about 9 cm and 5 small tick marks (so, 0.5 cm), so we'll call that 9.5 cm. Now, this is a known value, so you are certain that it is a least 9.5 cm. However, it may be true that there is one more decimal place that can be known. The general rule is that you want to add one more uncertain digit to the rightmost side of the number, and how many digits depends on the divisions of the instrument. Our ruler has divisions of 0.1 cm (the small tick marks), and so we will go one more place out, and add another digit. Now, let's say our eyes are pretty good, so let's say it's 9.5 cm, and then add that one uncertain digit, a 0 to the smallest division of 0.1, so, 0.10. The final measurement we record is 9.50 cm. Now, it may seem like we are simply guessing or even being unreasonable in our assessment of how long this pencil is. I can promise you that not knowing the actual measurement of this pencil will not make a spaceship crash because of a specification that was not the "right measurement". For those life-or-death measurements, much more precise measurement machines are used; this is just a pencil. Also, it would be unreasonable to say that it is 9.500000 cm or 9.500001 cm. We do not have that kind of certainty with this ruler, only divisions of 0.1 cm, so we can only estimate out to one more decimal place.
In short, find the smallest division of a ruler or whatever device (like a chemical beaker) you are using, and then add one uncertain digit to the end of that. If it's 0.1 cm, then add one digit to that. (example: 5.6 --> 5.63; 3 because that is what it looks like on the ruler). If it's 1 cm, then add an extra .1, so the measurement is 1.1 cm. And of course, it's not always cm you are using, that was just an example. Best of luck!
21. For each of the following precipitation reactions,
complete and balance the equation, indicating
clearly which product is the precipitate. If no reaction
would be expected, so indicate.
a. (NH4)2SO4(aq) + Ba(NO3)2(aq) →
b. HS(aq) + NiSO4(aq) →
c. FeCl3(aq) + NaOH(aq) →
describe the relationship between potential and kinetic energy
We know potential energy is position relative, and kinetic energy is motion relative. The primary relationship between the two is their ability to transform into each other. In other words, potential energy transforms into kinetic energy, and kinetic energy converts into potential energy, and then back again.
how are waves reflected, absorbed, and transmitted through various materials
Answer:
Electromagnetic Radiation
Explanation:
When light shines on an object, it is reflected, absorbed, or transmitted through the object, depending on the object's material and the frequency (color) of the light. However, because light can travel through space, it cannot be a matter wave, like sound or water waves.
Need help with this question please I’m really really going to appreciate it
Answer:
Alpha
Explanation:
^4 _2 He = alpha
^0 _-1 b = beta
^0 _0 y = gamma
Sex cells are produced by the process of mitosis.
True
False
Answer:
True is the Answer.
Explanation:
True.
w 17. Which of the following is the atomic number of a halogen? A. O 10 B. 136 C. 17 D. 13
Answer:
C. 17
Explanation:
The question above is related to the "Periodic Table of Elements." The Halogen group is located on the right side of the table. It consists of six elements: Fluorine, Chlorine, Bromine, Iodine, Astatine and Tennessine.
The "atomic number" of an element refers to the number of protons that can be found in the element's nucleus. Among the halogens, "Chlorine" is the only one with an atomic number of 17. Halogens do not have an atomic number of 10, 136 and 13.
This is the question!!!
Answer:
I think it's G
Explanation:
Answer:
eieaowjhfpowwohfawohfawhfae
Explanation: