Answers
In approximately 5 billion years, the sun will begin the helium-burning process, turning into a red giant star. When it expands, its outer layers will consume Mercury and Venus, and reach Earth.
Related Questions
Selenium, an element required nutritionally in trace quantities, forms compounds analogous to sulfur. Name the following ions.
a. SeO_4^2-
b. Se^2-
c. HSe^-
d. HSeO_3^-.
Answers
b. selenide . (sulfide counterart)
c. hydroselenide . (hydrosulfide counterpart)
d. hydrogen selenite
The names of ion are:
[tex]Selenate = SeO_4^{2-}\\Selenide = Se^{-2}\\Hydroselenide = HSe^-\\Hydrogenselenite = HSeO_3^-\\[/tex]
Explanation:
Sulfur forms various compounds such as sulfates, sulfites, sulfides, hydrosulfides, hydrogensulfites.The symbols of these ions are:[tex]Sulfate = SO_4^{2-}\\Sulfite = SO_3^{2-}\\Sulfide = S^{-2}\\Hydrosulfide = HS^-\\Hydrogensulfite = HSO_3^-\\[/tex]
According to the question, selenium also forms compounds analogous to sulfur so the name of the given ions of selenium will be in analogy to that of the sulfur compound.
[tex]Selenate = SeO_4^{2-}\\Selenide = Se^{-2}\\Hydroselenide = HSe^-\\Hydrogenselenite = HSeO_3^-\\[/tex]
Learn more about sulfur and selenium here
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When a liquid is at its boiling point, the vapor pressure of the liquid
Answers
Which formula can be used to calculate the percent yield?
a.(Theoretical yield ÷ actual yield) x 100
b.(Actual yield ÷ theoretical yield) x 100
c.(Amount of reactants ÷ amount of products) x 100
d.(Amount of products ÷ amount of reactants) x 100
Answers
1. A substance with 1 or 2 electrons in the valence shell is called what?
A. Insulator
B. Conductor
C. Molecule
D. Semiconductor
Answers
Answer:
B. Conductor
Explanation:
Please help me out in this question am giving the brainliest
Answers
moles of NaOH = mass/Mr = 120g/(23+16+1) = 3moles
concentration of NaOH = 3moles/2L =1.5M
What is the correct clases for this drugs
Compazine
heelp me please
and
Promethazine
Answers
Answer:
Compazine belongs to a class of drugs called Antiemetic Agents; Antipsychotics, Phenothiazine.
Which direction does heat flow from
Answers
Answer:
A
Explanation:
hot to cold; jus took the quiz;)
when two atoms share four valence electrons the shared electrons form a/an ____
Answers
2 electrons from each atoms
lidocain có tính bazơ không
Answers
Answer:
Lidocain là cơ bản.
Tôi hy vọng câu trả lời của tôi là hữu ích cho bạn.
Identify whether the solubility of Ag_2CrO_4 will increase or decrease by adding the following agents.
a. Na2CrO4
b. HCl
c. NH3
Answers
b) with addition of HCl silver chromate solubility will increase as silver chromate reacts with HCl to produce silver chloride precipitate (white). silver chromate is red-brown color hence it can be easily distinguished
c) with NH3 silver chromate will form diamine complex and results in increased solubility of silver chromate
Which benzene derivative would be the least reactive in an electrophilic aromatic substitution reaction
Answers
example of electron withdrawing group are: NO2, carbonyls
A lab team places 0.250g of an unknown solid acid in an Erlenmeyer flask. They neutralize the solid acid with 15.0ml of 0.210 M Na(OH)(aq). One mole of the acid reacts with one mole of the base. Calculate the molar mass of the unknown solid acid O 158 g/mol 0 7.9 g/mol 79.4 g/mol 0 763 g/mol
Answers
Answer:
Molar mass of the unknown acid is 79 grams
Explanation:
We have to first get moles in 15.0 ml of sodium hydroxide solution:
[tex]{ \sf{1 \: l \: of \:NaOH \: contains \: 0.210 \: moles }} \\ { \sf{0.015 \: l \: of \: NaOH \: contain \: (0.015 \times 0.210) \: moles }} \\ { \underline{ = 0.00315 \: moles \: of \: NaOH}}[/tex]
since mole ratio of acid : base is 1 : 1, so;
moles of acid that reacted is 0.00315 moles of the unknown acid.
then we've to get molar mass:
[tex]{ \sf{0.00315 \: moles \: of \: acid \: weigh \: 0.250 \: g}} \\ { \sf{1 \: mole \: of \: acid \: weighs \: ( \frac{1 \times 0.250}{0.00315} ) \: g}} \\ { \underline{ = 79.4 \: g \approx79 \: grams}}[/tex]
3-4. When something interests you, how do you make a hypothesis?
5-6. Why is it important to take a good notes when you are conducting an experiment?
7-8. What is the last step in the scientific method? Explain.
9-10. Name one thing you want to investigate this year for a scientific project? Why?
Answers
Answer:
3-4. I think we should research the topic, and make a assumption based on what you learned.
5-6.There are times when a scientist is unable to answer his own question. If he has taken good notes, another scientist may come along later and use his notes to find the answer. Every year there is new knowledge. The scientific method is a step-by-step process.
7-8.The final step of the scientific process is to report your results. Scientists generally report their results in scientific journals, where each report has been checked over and verified by other scientists in a process called peer review.
9-10. I don't know this one.
How are electrons arranged around an atom?
Answers
Answer:
Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy.
Answer:
Electrons are placed in the lower energy level first and when this is completely filled, we move on to the second energy level and so on. The way the electrons are arranged in an atom is called the atom's electronic structure or electronic configuration. The maximum number of electrons that the first shell can contain is 2.
Explanation:
Water is placed into a sealed jar and has a mass of 22.0 grams. The jar is placed in the freezer and the water turns to ice. The jar of ice is measured. The mass should be:
a. Slightly less than 22.0 grams
b. Exactly 22.0 grams
c. Slightly more than 22.0 grams
Answers
exactly 22.0 grams
because freezing is a physical change not a chemicl change..so nothing is taken away or added
ANSWER;
exactly 22.0 grams
because freezing is a physical change not a chemicl change..so nothing is taken away or added
will it sink or float?
giving brainlist
Answers
Answer:
Air will Float
Ice will Float.
aluminium will sink
Lead. has to sink
Gold will sink
Ethanol it will nor sink or float. it is like neutral.
methanol will Float.
Explanation:
may it helps you.
Mark me brainlist if it helps youChoose the best possible answer for Q.No. A, B, and C.
The following is an acid-base reaction between sulfuric acid and aluminum hydroxide. Use the provided molar masses to answer the questions below:
molar
mass
3 H2SO4
+
2 Al(OH)3
⟶
Al2(SO4)3
+
6 H2O
g/mol
98.08
78.00
342.15
18.02
Note: You need to upload the documents for A, B, and C to show your work.
A. How many moles of sulfuric acid would be required to form 65.21g of Water?
moles of H2SO4 = ________
[ Select ]
B. How many grams of Aluminum Sulfate could be formed if 197.0g aluminum hydroxide reacts with sulfuric acid?
mass of Al2(SO4)3 = ________
[ Select ]
C. To determine the concentration of a sulfuric acid sample, a titration is performed with the above reaction. What is the concentration of the sulfuric acid if a 15.00mL sample reached its titration endpoint with 29.26mL of 0.2855M Al(OH)3?
Molarity of H2SO4 = ________
[ Select ]
Answers
Answer:
c i think
Explanation:
Nonmetallic materials that are strong, brittle, resistant to heat and attack by chemicals, and are typically made from clay are known as:________
Answers
Into what genre does a novel fit that
takes place in a made-up world and
has events that couldn't really
happen?
A. non-fiction
B. mystery
C. fantasy
Answers
Answer:
A. non fiction or a ajami to download
A sealed reaction vessel initially contains 1.113×10-2 moles of water vapor and 1.490×10-2 moles of CO(g).
H20(g) +CO(g) <==> H2(g) + CO2(g)
After the above reaction has come to equilibrium, the vessel contains 8.326×10-3 moles of CO2(g).
What is the value of the equilibrium constant Kc of the reaction at the temperature of the vessel?
Answers
Answer:
Kc =[tex]\frac{[8.326x10-3]^{1} }{[1.113x10-2]^{1}[1.490x10-2]^{1} }[/tex]
Kc = 50.2059
Explanation:
1. Balance the equation
2. Use the Kc formula
Remember that pure substances, like H2 are not included on the Kc formula
The value of the equilibrium constant Kc of the reaction at the temperature of the vessel is 0.05.
Calculation,
The balanced chemical equation is given as,
[tex]2H_{2}O[/tex] + [tex]2CO[/tex] → [tex]2H_{2}[/tex] + [tex]2CO_{2}[/tex]
At t=0 1.113×[tex]10^{-2}[/tex] 1.490×[tex]10^{-2}[/tex] 0
At [tex]t=t_{eq}[/tex] 1.113×[tex]10^{-2}[/tex]-8.326×[tex]10^{-3}[/tex] 1.490×[tex]10^{-2}[/tex]-8.326×[tex]10^{-3}[/tex] 8.326×[tex]10^{-3}[/tex]
The number of moles of [tex]H_{2}O[/tex] at equilibrium = 1.113×[tex]10^{-2}[/tex]-8.326×[tex]10^{-3}[/tex]
The number of moles of [tex]CO[/tex] at equilibrium = 1.490×[tex]10^{-2}[/tex]-8.326×[tex]10^{-3}[/tex]
The number of moles of [tex]CO_{2}[/tex] at equilibrium = 8.326×[tex]10^{-3}[/tex]
What is equilibrium constant?Equilibrium constant is calculated bt ratio of product of concentration of reactant by product.
K = [tex][H_{2}O]^{2}[/tex]×[tex][CO]^{2}[/tex]/[tex][CO_{2}]^{2}[/tex]
K =( 1.113×[tex]10^{-2}[/tex]-8.326×[tex]10^{-3}[/tex] )∧2× (1.490×[tex]10^{-2}[/tex]-8.326×[tex]10^{-3}[/tex])∧2/(8.326×[tex]10^{-3}[/tex])∧2
K = 0.049 ≈ 0.05
To learn more about equilibrium constant,
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PLEASE HELP!!!!!!!!! WILL MARK BRAINLIEST
Answers
Answer:
19.278049929737628457607385688801
Explanation:
Volume = L * W * H
Volume = 17.78 * 9.21 * 4.45 = 728.70441
Density = Mass / Volume
Mass = 14,048
14,048 / 728.70441 = 19.278049929737628457607385688801
Density = 19.278049929737628457607385688801
Explanation:
So density = mass/volume
Using this formula we'll solve the question.
mass = 14,048g/1000 = 14.048 kg
volume = 17.78/100 x 9.21/100 x 4.45/100
volume = 0.3143 m³
density = 14.048 kg/ 0.3143 m³
density = 44.69 kg/m³
round off to = 44.7 kg/m³
Write differences between reactants and products.
Answers
Reactants - The substance which participate in a chemical reaction are called reactants.
[tex] \rm \: Example - H_2 \: , \: O_2[/tex]
Product - The substance which are formed by chemical reaction between the reactants are called product.
[tex]\rm \: Example - H_2 O[/tex]
Explanation:
reactant is a substance that is present at
the start of a chemical reaction.
product is a substance
that is present at the end of a chemical
reaction.
Part A
In the year 2012, an estimated amount of 31.6 billion metric tons (1 metric ton = 1000 kg) of carbon dioxide (CO2) was emitted worldwide due to fossil fuel combustion
and cement production. Express this mass of CO2 in grams without exponential notation, using an appropriate metric prefix
Answers
The mass of CO₂ in grams without exponential notation and with the appropriate metric prefix is 31.6 Eg.
First, let's calculate the amount of mass in grams of 31.6 billion metric tons.
Knowing that 1 metric ton is equal to 1000 kg, 31.6 billion metric tons is:
[tex]m = \frac{1000 kg}{1 \: metric \: ton}*\frac{1000 g}{1 kg}*31.6 \cdot 10^{12} \: metric \: ton = 3.16 \cdot 10^{19} g[/tex]
The metric prefix that is close to the above result is exa (E), which is equal to 10¹⁸.
Therefore, the mass of CO₂ in grams without exponential notation and with the appropriate metric prefix is 31.6 Eg (exa-gram).
To learn more about metric prefixes go here: https://brainly.com/question/20712978?referrer=searchResults
I hope it helps you!
CHAPTER 8 FORCE AND MOTION
Choose the S.I. unit for pressure.
1. Watt
2. Joule
3. Pascal
4.Newton
Answers
The body of knowledge that deals with Earth and its place in the universe is called _____________?
Answers
Answer:
Cosmology is a branch of astronomy that involves the origin and evolution of the universe, from the Big Bang to today and on into the future. According to NASA, the definition of cosmology is "the scientific study of the large scale properties of the universe as a whole."
how to find the average speed of something
Answers
Answer:
if you want to find average speed so u need to use this formula
Average speed = [tex]\frac{Total Displacement}{Total Time}[/tex]
Question 18(Multiple Choice Worth 5 points)
(03.02 MC)
Which of the following elements has properties different than the rest?
H
K
N
O
Answers
Answer:
H
hydrogen have different properties
In the coordination compound [Pt(NH 3) 2Cl 2], the coordination number and oxidation number of the central atom are ________ and ________, respectively.
Answers
coordination number is 4 because there are 4 things that is attached/coordinated to the central atom Pt (2 NH3 molecule, 2 Cl- ion)
oxidation number is +2
what is the density of a 5 mL sample of 1.95g of Gold
Answers
Answer:
density=mass/volume
=1.95/5 = 0.39 g(mL)-¹
Metric system is also known as the (use the amount of letters in 16 across) WILL MARK BRAINLIEST:))
Answers
Answer:
Si System
hope this helped!