Answer:Artificial light from cities has created a permanent "skyglow" at night, obscuring our view of the stars. Here's their map of artificial sky brightness in North America, represented as a ratio of "natural" nighttime sky brightness. In the black areas, the natural night sky is still (mostly) visible.
Explanation:
The pH of solution A is 7 and the pH of solution B is 5. Solution A has ____ times ______ hydrogen ion concentration compared to solution B.
Answer: 100, less
Explanation:
What substances are produced when an acid reacts with a base?.
Answer:
Acid + Base ------> Salt + Water
Example:
HCl + NaOH ------> H2O + NaCl
Balance the equation using the
correct coefficient:
lithium + water produces lithium
hydroxide + hydrogen gas
[ ? ]Li + 2H2O → LiOH + H2
Enter
Answer:
[tex]2\; {\rm Li} + 2\; {\rm H_{2} O} \to 2\; {\rm LiOH} + 1\; {\rm H_{2}}[/tex].
Explanation:
Assume that the coefficient of [tex]{\rm LiOH}[/tex] is [tex]1[/tex]:
[tex]?\; {\rm Li} + ?\; {\rm H_{2} O} \to 1\; {\rm LiOH} + ?\; {\rm H_{2}}[/tex].
The product side of this equation would include:
[tex]1[/tex] [tex]{\rm Li[/tex] atom.[tex]1[/tex] [tex]{\rm O}[/tex] atom.The number of [tex]{\rm H}[/tex] atoms on the product side is not known since the coefficient of [tex]{\rm H_{2}}[/tex] is not yet found.By the conservation of atoms, the reactant side of this equation should also include:
[tex]1[/tex] [tex]{\rm Li}[/tex] atom, and[tex]1[/tex] [tex]{\rm O}[/tex] atom.The only reactant that includes [tex]{\rm Li}[/tex] atoms is [tex]{\rm Li}\![/tex]. Thus, the coefficient of the reactant [tex]\!{\rm Li}[/tex] should be [tex]1[/tex] to ensure that the reactant side of this equation includes exactly [tex]1\![/tex] [tex]{\rm Li}\!\![/tex] atom.
Likewise, the only reactant that includes [tex]{\rm O}[/tex] atoms is [tex]{\rm H_{2}O}[/tex], with one [tex]{\rm O}\![/tex] atom in each formula unit of [tex]{\rm H_{2}O}\![/tex]. There needs to be [tex]1\![/tex] [tex]\!{\rm O}[/tex] atom on the reactant side of this equation. Therefore, the coefficient of the reactant [tex]{\rm H_{2}O}\!\![/tex] should also be [tex]1[/tex]:
[tex]1\; {\rm Li} + 1\; {\rm H_{2} O} \to 1\; {\rm LiOH} + ?\; {\rm H_{2}}[/tex].
The reactant side of this equation now include:
[tex]1[/tex] [tex]{\rm Li}[/tex] atom.[tex]1[/tex] [tex]{\rm O}[/tex] atom.[tex]2[/tex] [tex]{\rm H}[/tex] atoms.By the conservation of atoms, the product side of this equation should also include:
[tex]1[/tex] [tex]{\rm Li}[/tex] atom.[tex]1[/tex] [tex]{\rm O}[/tex] atom.[tex]2[/tex] [tex]{\rm H}[/tex] atoms.The product [tex]1\; {\rm LiOH}[/tex] alone would account for [tex]1\; {\rm Li}[/tex] atom, [tex]1\; {\rm O}[/tex] atom, and [tex]1\; {\rm H}[/tex] atom. Thus, there would be only [tex]1[/tex] more [tex]{\rm H}[/tex] atom for the other product, [tex]{\rm H_{2}}[/tex]. However, since there are [tex]2[/tex] [tex]{\rm H}\![/tex] atoms in every formula unit of [tex]{\rm H_{2}}\![/tex], the coefficient of [tex]\!{\rm H_{2}}[/tex] would need to be [tex](1/2)[/tex]:
[tex]1\; {\rm Li} + 1\; {\rm H_{2} O} \to 1\; {\rm LiOH} + (1/2)\; {\rm H_{2}}[/tex].
Atoms of each element are indeed conserved in this equation.
Eliminate the fractions by multiplying all coefficients by [tex]2[/tex] (least common denominator of all coefficients in this equation):
[tex]2\; {\rm Li} + 2\; {\rm H_{2} O} \to 2\; {\rm LiOH} + 1\; {\rm H_{2}}[/tex].
Isabella travels 17 miles north, 3 miles east, and then 10 miles south. What is the total distance that Isabella has traveled?
Answer:
30 miles
Explanation:
Just add the numbers.
What Scientist presented the theory of Continental Drift?
A.Albert Einstein
B.Sir Isaac Neutron
C.Henry Ford
D.Alfred Wegener
Answer:
d
Explanation:
Alfred Wegener was the one who proposed the idea although he wasn't believed until after he died
The scientist who presented the theory of Continental Drift is Alfred Wegener. The correct option is D.
What was continental drift theory?The continental drift idea provided an explanation for why the continents had moved from their original places. Once linked as a single entity, called a "Subcontinent."
Since continental rocks are too light to sink to the ocean floor, the common belief that mountains were to blame for their sinking was later disproved.
Alfred Lothar Wegener is a climatologist. He discovered the continental drift theory. The science of plate tectonics has now supplanted the theory of continental drift. The scientist Alfred Wegener is most closely identified with the hypothesis of continental drift. He referred to it as continental drift.
Therefore, the correct option is D. Alfred Wegener.
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According to Avogadro's law, why does the volume of a gas need to increase as the number of particles increases in order to maintain a constant
pressure?
A food web is
a. many food chains linked together
b. a web with only one food chain
c. a simple food chain
Answer: A
Explanation:
A food web is just a bigger picture idea and more complex version of a food chain.
Answer:
a. many food chains linked together
Explanation:
A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem.
A gaseous substance turns directly into a solid. Which term describes this change?.
Answer:
Deposition
Explanation:
Deposition: The gaseous substance turns directly into a solid without undergoing the liquid phase
which material will correctly complete the chart
Answer:
carbon
Explanation:
because it is part of many different molecules
Answer:
Salt
Explanation:
Substances can be classified into elements, compounds or mixtures in chemistry.
Elements, compounds and mixturesElements are simple substances which cannot be broken down any further. Elements can be found in the periodic table of elements.
On the other hand, compounds and mixtures are made up of two or more elements.
When the atoms of different elements are chemically combined, they are known as compounds. The different components of a mixture can be separated by physical means, such as filtration.
For example, sodium and chlorine are elements. When chemically combined, the compound is known as sodium chloride. An example of a mixture would be sand in water.
WorkingGold, nitrogen and carbon are elements which can be found in the periodic table as Au, N, and C respectively. Whether the element is shiny, found in the atmosphere or found in different molecules does not change the fact that they are only made of one type of atom and are thus elements.
Salt is indeed made up of two types of elements, and they are chemically combined. Table salt is known as sodium chloride (NaCl) and the 2 elements are sodium and chlorine.
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Show how you would prepare a 0.1 M solution of potassium hydroxide with .0025 moles of potassium hydroxide.
Show all work !
Answer:
0.025 L KOH
Explanation:
Because you gave molarity and moles, I am assuming that you are looking for volume via the molarity equation. I simply plugged the given values into the molarity equation and rearranged to isolate the liters variable.
Molarity (M): 0.1 M
Moles: 0.0025 moles
Volume (L): ? L
Molarity (M) = moles / liters (L)
0.1 M KOH = (0.0025 moles KOH) / (? L KOH)
(0.1 M KOH) x (? L KOH) = 0.0025 moles KOH
? L KOH = (0.0025 moles KOH) / (0.1 M KOH)
? L KOH = 0.025 L KOH
What is the concentration of a solution made by diluting 55 mL of 6.0 M HCl to a final volume of 750 mL
Answer: Ernest Z. The concentration would be 0.76 mol/L.
How many moles of nitrate are dissolved in water if 6.15 mole strontium nitrate dissolve?
***hint: how many nitrate ions are found in the compound?
The number of moles of nitrate dissolved in water if 6.15 mole of strontium nitrate is : 12.3 moles
Given data :
Moles of strontium nitrate = 6.15 moles
Ionization of Strontium NitrateWhen strontium nitrate ( [tex]Sr(NO_{3} )_{2}[/tex] ) is placed in water it will dissociates into its ions because strontium nitrate is an ionic compound.
Next step : Represent the ionization of strontium nitrate
[tex]Sr ( NO_{3} )_{2} (aq) --- > Sr^{2+} (aq) + 2NO_{3} ^{-} (aq)[/tex]
From the Stoichiometry of the chemical reaction
I mole of strontium nitrate = 2 moles of Nitrate ions
6.15 mole of strontium nitrate = 2 * 6.15
= 12.3 moles of Nitrate
Hence we can conclude that The number of moles of nitrate dissolved in water if 6.15 mole of strontium nitrate is : 12.3 moles.
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PLEASE HELP IM TAKING A TEST!!! Consider the reaction 4FeS2 + 11O2 → 2Fe2O3 + 8SO2. If 8 moles of FeS2 react with 15 moles of O2, what is the limiting reactant?
a
FeS2
b
Fe2O3
c
O2
d
SO2
Answer:
c-)O2
Explanation:
A gas cylinder under constant pressure, such as one with a moveable piston, initially contains 0.25 moles of neon in 5.0 L. If 0.50 moles of helium are added to this gas cylinder, what will be the final volume
Answer:
15L will be the final volume
STEPS:
.50 + .25 = .75
.25/5 ÷ .75/x
(.75*5=3.25)
.25x = 3.25
x=15
quizlet
Hello people ~
By reacting with which of the following, primary amines can be separated from secondary and tertiary amines?
a) Chloroform alone
b) Methyl iodide
c) Chloroform and alcoholic KOH
d) Zinc dust
Answer:
C. Chloroform and alcoholic KOH
Explanation:
Secondary and tertiary amines do not react with CHCl3 and alc. KOH generates isocyanide, whereas primary amine does.
The state of matter with an indefinite shape and definite volume is:.
Liquid. It's volume stays the same but liquid changes shape based on what it's contained in
When you normally go to Dunkin Donuts you order a large coffee with Two Sugars which is really sweet and just how you like it today was really hot out so you decided to get a large iced coffee. Explain why the large iced coffee doesn't taste as sweet as you like it even though you added two sugar packets to it.
Answer:
I thank it is because of the cold It doesn't really taste sweet because the temperature is lower hence the sugar does not dissolve properly.
Dissolution of a solute
the equilibrium concentration of hydroxide ion in a saturated iron(ii) hydroxide solution is 1.2 x 10^-5 M at a certain temperature. calculate ksp of fe(oh)2 at this temperature
From the calculation as shpwn in the procedure below, the equilibrium constant of the substance is 6.9 * 10^-15.
What is equilibrium constant?The equilibrium constant for the solubility of aa solid in solution is called the solubility product Ksp. The Ksp shows the extent to which a solid is dissolved in solution.
Given that;
Fe(OH)2 ⇄Fe^2+ + 2(OH)^-
Ksp = s(2s)^2
We have s as 1.2 x 10^-5 M
So
Ksp = 4s^3
Ksp = 4( 1.2 x 10^-5 )^3
Ksp = 6.9 * 10^-15
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10. Circle the letter of each sentence that is true about how ocean currents influence climates.
a. Ocean currents influence many marine climates.
b. Only warm ocean currents influence climates.
c. The North Atlantic Drift gives Ireland a warm climate for its latitude.
d. The California Current gives the West Coast a warm climate for its latitude.
Answer:
a. Ocean currents influence many marine climates.
c. The North Atlantic Drift gives Ireland a warm climate for its latitude.
a & c
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what are the products of the neutralization reaction between HNO3 and Ca(OH)2?
HNO3+Ca(OH)2= Ca(NO3)2+H2O.Answer:
Explanation:hope this helps <3
in an aerosol spray can with a volume of 456 ml contains is 3.18g of propane gas as a propellant If the can is at 23° C and 50 ATM what volume will be the propane occupy at STP
Answer: Answer:
21.03L
Explanation:
V1 = 456mL = 0.456L
T1 = 23°C = (23 + 273.15)K = 296.15K
P1 = 50atm
V2 = ?
T2 = 273.15K
P2 = 1.0atm
Note : P2 and T2 are at STP which are 1.0atm and 273.15K
To find V2, we have to use the combined gas equation,
(P1 × V1) / T1 = (P2 × V2) / T2
P1 × V1 × T2 = P2 × V2 × T1
V2 = (P1 × V1 × T2) / (P2 × T1)
V2 = (50 × 0.456 × 273.15) / (1.0 × 296.15)
V2 = 6227.82 / 296.15
V2 = 21.029L
Final volume of the gas is 21.03L
Explanation:
An ion contains 54 electrons after its atom gained 1 electron to form a stable electron
structure. Write the name and symbol of the ion.
Answer:
Iodine has an atomic number of 53 meaning 53 electrons and it gain 1 electron when reacting with a metal. We know the element is a non metal as is gains an electron
Ion is fluoride (F⁻), gaining 1 electron for a stable electron structure like noble gas neon (Ne).
Fluorine (F) is an element with 9 electrons in its neutral state. By gaining 1 electron, it forms the fluoride ion (F⁻) with 10 electrons. This allows the ion to achieve a stable electron configuration, following the octet rule.
Fluoride ions are highly reactive due to their electron configuration and tend to form ionic compounds. They play essential roles in various chemical and biological processes, such as dental health, where fluoride compounds are added to prevent tooth decay.
Fluoride ions' stability and reactivity make them important in various industrial and scientific applications, including the production of fluorine-containing compounds used in refrigerants, plastics, and pharmaceuticals.
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DETERMINE THE REACTANTS AND PRODUCTS AND WRITE THE CHEMICAL EQUATION COMPLETE WITH CORRECT FORMULAS AND SYMBOLS FOR THE CHEMICAL CHANGE BELOW
NOTE: USE YOUR KNOWLEDGE OF CHEMICAL FORMULA WRITING FROM THE GRADE 9 LESSON
1)SOLID POTASSIUM CHLORATE DECOMPOSES TO FORM SOLID POTASSIUM CHLORIDE AND OXYGEN GAS
REACTANT(S): ______________
PRODUCT(S): _______________
CHEMICAL EQUATION
2) WATER IS ELECTROLYZED TO FORM HYDROGEN AND OXYGEN GAS (Note: Hydrogen and Oxygen are diatomic elements)
REACTANT(S): ______________
PRODUCT(S): _______________
CHEMICAL EQUATION
Answer:
2KClO3(s) = 2KCl(s) + 3O2(g)
Explanation:
2KClO3(s) = PRODUCT
2KCl(s) + 3O2(g)=REACTENT
A solution that has a high amount of hydroxide ions is called.
Answer:
.... is called acidic solution
Answer:
It is called acidic solution
is math involved in basketball? and how?
Answer:
yes
Explanation:
math is used constantly to improve one's performance. Achieving the objective of shooting a basketball includes using percentages and angles. By finding the most consistent percentage of shots made while using a certain angle, you can find out which player will score the most baskets.
a boulder of shore is slowly broken apart by the force of the water it is a change or it is a example
Answer:
I think that this would be an example of erosion
Liquid Ethyl Alcohol has a specific heat capacity of 2. 40J/g*C. Calculate the heat change that would take place as 25. 7 of liquid Ethyl alcohol are cooled from 55. 2C to 30 C
Taking into account the definition of calorimetry, the heat change that would take place as 25.7 g of liquid Ethyl alcohol are cooled from 55.2 °C to 30 °C is -1554.336 J.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
Heat changeIn this case, you know:
Mass= 25.7 gInitial temperature= 55.2 °CFinal temperature= 30 ºCSpecific heat= 2.40 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
Q= 2.40 [tex]\frac{J}{gC}[/tex]× 25.7 g× (30 °C - 55.2 °C)
Solving:
Q= -1554.336 J
Finally, the heat change that would take place as 25.7 g of liquid Ethyl alcohol are cooled from 55.2 °C to 30 °C is -1554.336 J.
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How many grams of carbon dioxide are produced from 6.95 moles of oxygen in the following reaction?
2CH4 + 4O2 → 2CO2 + 4H2O
Answer:
153 g CO₂
Explanation:
To begin, the reaction is not in its simplest form. The coefficients can be divided by two. However, this will not change the answer.
CH₄ + 2 O₂ --> CO₂ + 2 H₂O
You can find the grams of CO₂ by taking the moles of O₂, using the mole to mole ratio of O₂ to CO₂ (via the coefficients), then converting moles of CO₂ to grams. You will need the molar mass of CO₂ since you want to convert it from moles to grams. This is calculated using the values on the periodic table. The ratios should be written in a manner that allows for the cancellation of units. The answer should have 3 sig figs.
12.011 g/mol + 2(15.998 g/mol) = 44.007 g/mol CO₂
6.95 moles O₂ 1 mol CO₂ 44.007 g CO₂
---------------------- x ------------------- x ------------------------- = 153 g CO₂
2 mol O₂ 1 mol CO₂
How to make caramel out of sweetened condensed milk?.
Answer:
Preheat oven to 425°F.
Pour one can of sweetened condensed milk into a casserole dish or pie plate. Cover with foil.
Place in a larger pan and fill to ¾" with water. ( Fill water as needed while baking)
Bake 60-90 minutes or until condensed milk has reached a golden brown color.
Cool completely.
Explanation:
hope this helps :D
Water (H2O) is a liquid at room temperature (22 °C) while methane (CH4) is a gas. Which BEST explains the difference in their phases of matter at room temperature?
Answer:
Explanation:
Methanes boiling point would be higher than water's
Water is a liquid because particles are held close to one another by hydrogen bonds, whereas methane is a gas because the weak IMF lets particles to spread out.
What is methane ?Hydrocarbon methane ( CH4 ) is a main constituent of natural gas. Because methane is a greenhouse gas (GHG), its presence in the atmosphere has an impact on the planet's climate and temperature.
A range of anthropogenic (influenced by humans) and natural sources release methane into the atmosphere.
The significant difference in polarity between oxygen and hydrogen causes the water molecules to be dipolar. As a result, a strong hydrogen bond forms between the H and O of nearby water molecules, packing the water molecules so closely together that water is a liquid at ambient temperature.
Thus, water is a liquid because particles are held close to one another by hydrogen bonds, whereas methane is a gas because the weak IMF lets particles to spread out.
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