HELP ASAP 20 OR MORE POINTS!!!!
In Brian Greene's "A Physicist Explains Why Parallel Universes May Exist", what reason does Greene give for why he believes parallel universes may exist?
Question 1 options:
Worm holes make traveling between parallel universes possible.
There are only so many ways matter can arrange itself within that infinite universe.
He has seen a parallel universe himself.
Scientists have already proven the existence of parallel universes.
Answer:
B: There are only so many ways matter can arrange itself within that infinite universe.
The idea of a parallel universe was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
A parallel universeMatter is anything that has mass and occupy space. The universe as we know it is filled with matter. The theory of multiple universe holds that there could be another universe apart from this one that we know.
This theory was supported by Brian Greene on the basis that there are only so many ways matter can arrange itself within that infinite universe.
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Water cannot dissolve all substances that are made from ionic bonds. This is probably because
A.
Water needs to be stirred to dissolve all ionic substances
B.
Some ionic bonds are too strong for the attractions of water molecules to pull them apart
C.
Some water molecules are not as strong as others
Water cannot dissolve all substances that are made from ionic bonds probably because some ionic bonds are too strong for the attractions of water molecules to pull them apart.
WATER AS A UNIVERSAL SOLVENT:Water is a unique molecule often referred to as a universal solvent because it can dissolve almost all solutes. Water is capable of dissolving polar substances i.e. substances that have an unequal distribution of positive and negative ions.However, some ionic bonds formed from ions of elements are unable to be dissolved by water and this is probably attributed to the fact that those bonds are too strong to be pulled apart by water molecules.
Learn more about at ionic compounds at: https://brainly.com/question/9167977
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20 pts and brainliest
Name the Following Binary Ionic Compounds:
a. AgCl
b. ZnO
c. CaBr2
d. SrF2
Explanation:
a.Silver chloride
b.zinc Oxide
c.calcium Bromide
d.strontium difluoride
Static electricity happens when electrons pass from one object to another, such as from your hair to a comb as you comb your hair. If you were to comb your hair and then hold the comb near your hair, strands of hair would move forward and appear to stick to the comb. How could the interaction between the hair and the comb be described?
They repel each other because they have opposite charges.
They repel each other because they have the same charges.
They attract each other because they have opposite charges.
They attract each other because they have the same charges.
The volume of 3.2 moles of nitrogen gas inside a canister is 1.5L. The canister
volume is reduced to 0.3L. How many moles of nitrogen were released?
Answer:
2.56 moles of nitrogen was released.
Explanation:
We'll begin by calculating the final moles of nitrogen in the canister. This can be obtained as follow:
Initial mole (n₁) = 3.2 moles
Initial volume (V₁) = 1.5 L
Final volume (V₂) = 0.3 L
Final mole (n₂) =?
V₁/n₁ = V₂/n₂
1.5 / 3.2 = 0.3 / n₂
Cross multiply
1.5 × n₂ = 3.2 × 0.3
1.5 × n₂ = 0.96
Divide both side by 1.5
n₂ = 0.96 / 1.5
n₂ = 0.64 mole
Finally, we shall determine the number of mole of nitrogen that was released. This can be obtained as follow:
Initial mole (n₁) = 3.2 moles
Final mole (n₂) = 0.64 mole
Amount released =?
Amount released = n₁ – n₂
Amount released = 3.2 – 0.64
Amount released = 2.56 moles
Thus, 2.56 moles of nitrogen were released.
What are cells made of?
Answer: All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.
Explanation: please mark as brainliest
URGENT PLS I NEED THIS OR I WILL FAIL AND HAVE TO DO SUMMER SCHOOL
Carbon monoxide gas and oxygen gas combine to form carbon dioxide
gas in the following equation:
2CO(g) + O2(g) → 2CO2(g)
The enthalpy value for gaseous carbon monoxide is -110.5, and gaseous
carbon dioxide is -393.5, calculate the enthalpy change (AH) for the
reaction.
Answer:
ΔHr = -566kJ/mol
Explanation:
Based on Hess's law, the ΔH of a reaction is the sum of the ΔH's of products times its coefficient subtracting the ΔH of reactants. For the reaction:
2CO(g) + O2(g) → 2CO2(g)
ΔH is:
ΔHr = 2*ΔH CO2 - (2ΔH CO + ΔH O2)
As ΔH CO2 = -393.5kJ/mol; ΔH CO = -110.5kJ/mol and ΔH O2 = 0kJ/mol
ΔHr = 2*-393.5kJ/mol - (2*-110.5kJ/mol)
ΔHr = -566kJ/molOne molecule of a compound weighs 2.93 10–22 g. The molar mass of this compound is:
A)
2.06 g/mol
B)
567 g/mol
C)
168 g/mol
D)
176 g/mol
E)
none of these
Answer:
176 g/mol
Explanation:
To get this, multiply the weight of the molecule by Avogadro's number:
(2.93×[tex]10^{-22}[/tex]) × (6.022×[tex]10^{23}[/tex]) = 176.44 g/mol
Using the information in the passage, rank the types of galaxies by their ability to form new stars, from most to least activity.
Answer:
The correct answer is number 2. Elliptical, Spiral, Irregular.
Explanation:
Unfortunately, you did not attach the passage. Without the passage, we do not know what its content is.
So we are going to answer this question with our own knowledge.
The types of galaxies by their ability to form new stars, from most to least activity are "Elliptical, Spiral, Irregular."
That is the way astronomers classify galaxies in scientific terms. These scientists consider that the smallest galaxies or dwarf galaxies have approximately 100 million stars. On the other hand, giant galaxies have billions or trillions of stars. That immense is our universe.
Scientists still studying the universe and the galaxies to understand the way galaxies are formed.
How many moles of mercury are equivalent to 3.46 x 1023 atoms?
Answer:
3.02 X1023 atoms Ag limol. - - 0.50 1 moles. 6.02241023 atoms.
what electrolyte is used in a lead storage battery?
A. hydrochloric acid
B. sulfuric acid
C. lead acetate
D. lead nitrate
Answer:
Hi ,
Answer :
Sulfuric acid
how many protons are in phosphorous
Answer:
There are 15 protons in phosphorous.
~Hoped this helped~
~Brainiliest?~
Gold is classified as what type of element?
Why are isotopes with short half-lives not useful for dating very old rocks?
-because not enough of the parent isotope remains to measure accurately
-because not enough of the daughter product has formed to be detectable
-because neither the parent isotope nor the daughter product will be detectable
-because very old rocks would never have contained these isotopes
Answer:
because not enough of the parent isotope remains to measure accurately. because not enough of the daughter product has formed to be detectable.
Explanation:
Hope it helps
Which environment is BEST for an organism that sleeps during the day and digs holes in the ground for shelter?
A
Which Chemical Reaction is balanced?
Answer:
A
Explanation:
The letter A is the correct answer
your friend says that there is a kind of fue that only dries when it is exposed to a special type of light.can light cause glue to dry?
Answer:
No. Light is not a physical thing, so it cannot change physical things like glue.
Explanation:
Light is not effective at all to glue, it doesn't do anything at all.
Which person do you agree with the most?
A Casey: The human population had been fairly constant throughout
Earth's history.
Allayna: Population size is increasing at a significant rate due to
advances in technology, medicine, and sanitation.
© Karl: Population size has been decreasing over time because people
are having fewer children.
Describe the two methods to increase the rate at which a substance dissolves.
an elephant puts a force of 30,000 N on its four feet,
which have a total area of 7,500 cm². What is the pressure
it puts on the ground
Explanation:
pressure is Force/area
30000/0.75
Find the density of an object that has a mass of 12.69 grams and a volume of 3.5cm3
Answer:
3.62 g/cm³
Explanation:
density = mass ÷ volume
Therefore, do 12.69 divided by 3.5
Please help with this
Benzoic acid contains 68.8% carbon, 4.95% hydrogen, and 26.25% oxygen. Find the empirical formula of benzoic acid.
Answer:
C7H6O2
Explanation:
Let;
68.8% of Carbon represents 68.8g
4.95% of Hydrogen represents 4.95g
26.25% of Oxygen represent 26.25g
Next, we convert each gram value to mole value by dividing by their respective molar mass {C = 12, H = 1, O = 16}
C = 68.8/12 = 5.73 mol
H = 4.95/1 = 4.95 mol
O = 26.25/16 = 1.64 mol
Next, we divide each mole value by the smallest (1.64mol)
C = 5.73 ÷ 1.64 = 3.49
H = 4.95 ÷ 1.64 = 3.02
O = 1.64 ÷ 1.64 = 1
Next, we multiply each ratio by 2 to obtain our simplest whole number ratio (empirical formula)
C = 3.5 × 2 = 7
H = 3.02 × 2 = 6
O = 1 × 2 = 2
Hence, the ratio of C, H and O is 7:6:2 and the empirical formula of benzoic acid is C7H6O2
A buffer solution is prepared by adding NaH2PO4
to a solution of H3PO4 (phosphoric acid).
H3PO4(aq) = H+ (aq) + H2PO4 - (aq)
What happens if HCl is added?
In the case when the HCI should be added so it should be shifted to reactants.
What is a buffer solution?It is the solution that should be considered as the aqueous solution that comprise of the mixture of the weak acid and the conjugate base.
Here the ph level should be change very less at the time when the small amount of the strong acid should be added.
Therefore, it should be shifted to reactants.
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Ideal gas law:
If 6.3 moles of a gas in a 20 L cylinder have a pressure of 5.5 atm, what is the temperature?
Answer:
212. 9 degree celcius
Explanation:
From PV =nRT
T= PV/nR
T= (5. 5x20)/(6. 3x0. 082)
T= 110/0. 5166
T= 212. 9 degree celcius
WILL GIVE BRAINLIEST
Calculate the number of moles of AL2O3 that are produced when 0.25 moles of fe is produced
2AL(s) + 3FeO(s)-----> 3Fe(s)+ Al2O3(s)
Which substance is a binary acid?
1,)hydrochloric acid
2.)phosphoric acid
3.)nitrous acid
4.)sulfuric acid
Answer:
1. Hydrochloric acid
Explanation:
Hydrochloric acid
Answer:
4)
Explanation:
formula:H2 SO4
there are 2 H+ ions in 1 molecule of sulfuric acid
thus it has a basicity of 2
If people had not extracted fossil fuels from Earth to use as energy, would this carbon be "cycling" within the global carbon cycle we have defined today?
Answer: The answer is YES. There would still be recycling of carbon even if it wasn't extracted as fossil fuels for energy use.
Explanation:
Carbon is an element in the periodic table with the atomic number of 12. It has 4 electrons on its outermost shell in the electronic configuration. These are valence electrons which are used to form bonds in a wide range of both organic and inorganic compounds, giving rise to simply molecules like carbondioxide.
CARBON CYCLE is a natural process through which carbon and it's compounds are kept fairly constant through recycling. They are found in fossils fuels such as oil, coal, and natural gas. When these fossil fuels are burnt and used as energy, carbon is released in form of carbondioxide. This is just one of the ways carbon is returned to the atmosphere. Other ways include:
--> respiration of plants and animals
--> decomposition of organic substances
--> action of dilute acids and heat on trioxocarbonates (V) and hydrogen trioxocarbonates (IV).
Carbon is then removed from the atmosphere through:
--> plants in photosynthesis
--> rain water as weak trioxocarbonate (IV) acid.
Therefore, there would still be recycling of carbon even if it wasn't extracted as fossil fuels for energy use because the burning of fossil fuels is not the only way carbon is returned to the atmosphere during carbon cycle.
please help! science 10 acid and bases!
Complete and balance the following neutralization reactions.
(a) H,SOA + NaOH
(b) HNO3 + KOH
(c) HCl + Ca(OH)2
(d) H PO, + Ba(OH)2
() CH,COOH + NaOH
(1) HNO3 + Sr(OH)2
(g) HF + Fe(OH)3
(h) HBr + Sn(OH)4
Answer:
See explanation
Explanation:
Recall that a neutralization reaction is one in which an acid reacts with a base to yield salt and water only. The equation is only balanced when the number of each atom on the reactant side is the same as the number of the same atom on the product side.
Let us now complete and balance each reaction equation;
(a) H2SO4 + 2NaOH --------> Na2SO4 + 2H2O
(b) HNO3 + KOH ---------> KNO3 + H2O
(c) 2HCl + Ca(OH)2 -------> CaCl2 + 2H2O
(d) 2H3PO4 + 3Ba(OH)2 ------> Ba3(PO4)2 + 6H2O
() CH3COOH + NaOH --------> CH3COONa + H2O
(1) 2HNO3 + Sr(OH)2 --------->Sr(NO3)2 + 2H2O
(g) 3HF + Fe(OH)3 ------> FeF3 + 3H2O
(h) 4HBr + Sn(OH)4 --------> SnBr4 + 4H2O