Answer:
I THINK IT IS TRUE BECAUSE THEY ERE FIRST FOUND TO DEMOCRITUS ARISTOTLE AND PLATO THE ROMANS AND GREEK CHEMISTS .
Explanation:
A(n) __________ occurs when the moon enters the umbral shadow of the earth without being entirely immersed in it.
partial lunar eclipse
total lunar eclipse
annular eclipse
Answer:
Partial lunar eclipse.
Explanation:
A lunar eclipse is a cosmological event by which, in the presence of the Earth between the Sun and the Moon, the latter does not receive the light of the Sun in the totality of its visible face, with which a part (or the totality ) of her is in the dark.
Thus, if the lunar eclipse implies an absence of sunlight in the entire lunar surface, the eclipse will be total, while if the eclipse implies an absence of light only in part, the eclipse will be partial (which is the most common event).
Find the percent composition for SF6
S =? %
F =? %
Answer:
S = 21.92 %
F = 78.08 %
Explanation:
To find the percent composition of each element in SF6, we must find the molar mass of SF6 first.
Molar mass of SF6 = 32 + 19(6)
= 32 + 114
= 146g/mol
mass of Sulphur (S) in SF6 = 32g
mass of Fluorine (F) in SF6 = 114g
Percent composition = mass of element/molar mass of compound × 100
- % composition of S = 32/146 × 100 = 21.92%.
- % composition of F = 114/146 × 100 = 78.08%.
This equation is not balanced. Click on the coefficient we should change first.
help ASAP
Answer: The coefficient we should change first is for [tex]NO_{3}[/tex].
Explanation:
The given reaction equation is as follows.
[tex]Al + Ni(NO_{3})_{2} \rightarrow Al(NO_{3})_{3} + Ni[/tex]
Here, number of atoms present on reactant side are as follows.
Al = 1Ni = 1[tex]NO_{3}[/tex] = 2Number of atoms present on the product side are as follows.
Al = 1Ni = 1[tex]NO_{3}[/tex] = 3To balance this equation, multiply Al by 2 and [tex]NO_{3}[/tex] by 3 on reactant side. Also, multiply [tex]Al(NO_{3})_{3}[/tex] by 2 and Ni by 3 on the product side.
Hence, the equation can be rewritten as follows.
[tex]2Al + 3Ni(NO_{3})_{2} \rightarrow 2Al(NO_{3})_{3} + 3Ni[/tex]
Now, number of atoms present on reactant side are as follows.
Al = 2Ni = 3[tex]NO_{3}[/tex] = 6Number of atoms present on product side are as follows.
Al = 2Ni = 3[tex]NO_{3}[/tex] = 6Since, the atoms on both reactant and product side are same. Hence, it is now a balanced chemical equation.
Thus, we can conclude that the coefficient we should change first is for [tex]NO_{3}[/tex].
Which of the following would be a correct conversion factor
relating carbon dioxide (CO2) and glucose (C6H1206) using the
balanced equation below?
6CO2 + 6H20C6H12O6 + 602
Answer:6CO2/1C6H12O6
Explanation:
what is the photo above showing
find the pH of
2.1 x 10-3 [HCI]
Answer: pH = 2.68
Explanation: pH = - log[H3O^+] .
HCl reacts with water : HCl + H2O -> Cl^- + H3O^+
So [H3O^+] = c(HCl) = 0.0021 M
pH = - log(0.0021) = 2.68
Which element has the largest nuclear charge?
Cs
Li
Mg
S
Answer:
Mg
Explanation:
I think Mg is correct not too sure tho
Balance the equation.
Fe + Cl2 → FeCl3
A. Fe + 3Cl2 + 2FeCl3
B. Fe + 3Cl2 → FeCl3
C. 2Fe + 3Cl2 + 2FeCl3
Answer:
C. 2Fe + 3Cl2 + 2FeCl3
Explanation:
Hello there!
In this case, according to the given chemical reaction:
Fe + Cl2 → FeCl3
It turns out possible to balance it via cross-multiplying the chlorine atoms as they do not result from a whole number multiplication; it means we get:
Fe + 3Cl2 → 2FeCl3
And we just balance Fe by placing a 2 on Fe:
2Fe + 3Cl2 → 2FeCl3
Thus, the answer is C. 2Fe + 3Cl2 + 2FeCl3
Regards!
The forces between ________ are examples of electric forces.
A.
charged particles
B.
neutrons
C.
masses
D.
photons
Answer:
The answer would be charged particles.
Explanation:
Electric force exists as one of the most fundamental forces in the universe, it occurs between all charged particles.
For each of the salts below, match the salts that can be compared directly, using Ksp values, to estimate solubilities.
a. Mg(OH)2
b. CaSO3
c. BaCrO4
d. CaS
1. copper (II) sulfide
2. zinc hydroxide
Answer:
1 - Salts required that can be compared directly, using Ksp values, to estimate solubilities for copper (II) sulfide are - [tex]CaSO_3[/tex] (Option b) ,[tex]BaCrO_4[/tex] (Option c) and [tex]CaS[/tex] (Option d)
2 - Salts that can be compared directly, using Ksp values, to estimate solubilities for zinc hydroxide are - [tex]Mg(OH)_2[/tex] (Option a)
Explanation:
[tex]K_s_p[/tex] values can be used to compare the solubility of salts that produce ions in a 1:1 ratio.
[tex]CuS[/tex] {copper (II)sulfide} dissociates with ions in ratio 1:1 .Because the salts [tex]CaSO_3[/tex] , [tex]BaCrO_4[/tex] and [tex]CaS[/tex] have a 1:1 ion ratio, the solubilities of options b, c, and d can be compared to salt 1.
[tex]K_s_p[/tex] Values can be used to compare the solubility of salts that produce ions in a 1:2 or 2:1 ratio.
2. [tex]Zn(OH)_2[/tex] dissociates into ions in ratio 1:2 .
Because the ions in the salt [tex]Mg(OH)_2[/tex] are in a 1:2 ratio, the solubility of salt 2 can be compared to that of salt 'a'.
Hence , Salt 1 is matched with options b , c , d.
Salt 2 is matched with option a.
3. How many grams of aluminum can be heated from 90°C to 120°C if 500 J of heat energy are applied?
(c = 0.900 J/g °C)
We are given:
Initial Temperature = 90°c
Final Temperature = 120°c
Heat applied(ΔH) = 500 Joules
Specific heat(c) = 0.9 Joules / g°C
Mass of Aluminium(m) = ?
Change in temperature:
ΔT = Final temp. - Inital Temp.
ΔT = 120 - 90
ΔT = 30°c
Calculating the mass:
We know the formula:
ΔH = mcΔT
replacing the values:
500 = m(0.9)(30)
500 = m(27)
m = 500/27
m = 18.52 grams
Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following:
(a) SO3
(b) N2O (N is central)
(c) CH2C12
Solution :
a). [tex]$SO_3$[/tex]
This compound is known as sulfur trioxide.
The molecular shape of sulfur trioxide is trigonal planer.
And the bond angle is 120°.
b). [tex]$N_2O$[/tex]
This compound is known as Nitrous oxide. Here, nitrogen is in the center. There is no lone pair around the nitrogen atom and it forms two sigma bonds with the other two atoms.
It is linear in shape.
The bond angle between them is 180°.
c). [tex]$CH_2Cl_{2}$[/tex]
This compound is known as the Dichloromethane.
The molecular shape of the compound is tetrahedral.
The bond angles is 120°
How many grams are in 2.0 x 10-5 moles of uranium?
Describe the De Borglie's hypothesis
Answer:
The De Broglie hypothesis proposes that all matter exhibits wave-like properties and relates the observed wavelength of matter to its momentum. After Albert Einstein's photon theory became accepted, the question became whether this was true only for light or whether material objects also exhibited wave-like behavior.
What sort of fossils would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole?
Answer:
Antarctic Peninsula, is one of the most important fossil sites on Earth.
hope this helps you ☺️☺️
Fossils that would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole is Antartica peninsula.
What are fossils?Fossils are the preserved remains, impression, or trace of any once-living thing from many years ago. Examples of the fossils include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants.
There are four different types of fossils-
Mold fossils
Cast fossils
Trace fossils or Ichnofossils
True form fossils
Imprints, tracks, and trails can also become fossilized and are called Trace fossils. Dinosaur footprints or worm burrows are the examples.
Living things when get decomposed from the so many years ago and become dirt and rocks are fossils.
Therefore, Fossils that would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole is Antartica peninsula.
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what is the vowel.????????????
Answer:
a e i o u
Explanation:
a e i o u
HELP ASAP CHEM!!!! Please
Answer:
The solubility of gases decreases with pressure as that of solids and liquids is not affected.
II. The student then takes a 1.00 M stock
solution of table sugar
(sucrose, C12H22011) and mixes 0.305 L
of stock solution with additional
distilled water to create a dilute
solution with a total volume of 1.25 L.
• Explain how the student can
determine the molarity of the
resulting solution. Show a valid
calculation for the final molarity.
Answer:
0.244 M.
Explanation:
From the question given above, the following data were obtained:
Molarity of stock solution (M₁) = 1 M
Volume of stock solution (V₁) = 0.305 L
Volume of diluted solution (V₂) = 1.25 L
Molarity of diluted solution (M₂) =?
The molarity of the diluted solution can be obtained by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
1 × 0.305 = M₂ × 1.25
0.305 = M₂ × 1.25
Divide both side by 1.25
M₂ = 0.305 / 1.25
M₂ = 0.244 M
Thus, the molarity of the diluted solution is 0.244 M
What information does a molecular formula give?
O A. The actual number of atoms in a molecule
OB. The percent composition of atoms in a molecule
O C. The lowest ratio of atoms in a molecule
O D. The order in which atoms are bonded in a molecule
Answer:
A. The actual number of atoms in a molecule
Explanation:
Molecular formula is simply defined as a type of chemical formula that describes the type and number of atoms present in a single molecule of a compound.
Looking at the options, the correct answer is option A.
Answer:
a
Explanation:
What are alleles? Are theys ame or different
Answer:
Kind of like DNA or a part of DNA
Explanation:
They are what make you a person, no they aren't the same
How many grams of sodium chloride are in 100 mL of 1.25 M sodium chloride?
Answer:
7.3125grams
Explanation:
Molarity is the measure of the molar concentration of a solution. It can be calculated using the formula as follows:
Molarity = number of moles (n) ÷ volume (V)
Based on the information given,
Molarity = 1.25 M
Volume = 100 mL = 100/1000 = 0.1 L
Molarity = n/V
1.25 = n/0.1
n = 1.25 × 0.1
n = 0.125mol
Using the below formula to calculate the mass of NaCl;
mole = mass/molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
0.125 = mass/58.5
mass = 0.125 × 58.5
mass = 7.3125 grams
Imagine that all microorganism suddenly disappeared from earth from what u have learned why do u think that animals would eventually disappeared from earth? Why would plant disappeared
Answer:
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When KCl(s) is dissolved in water, the resulting solution is classified as a
O heterogeneous compound
O homogeneous compound
O heterogeneous mixture
O homogeneous mixture
Answer:
O homogeneous mixture
Explanation:
When Kci is dissolved in water it becomes a solute in O homogeneous mixture
Magnesium metal reacts with hydrochloric acid to produce hydrogen gas and a solution of magnesium chloride. Write and balance the chemical equation for this reaction, and determine the volume of the hydrogen gas generated (at 1.00 atm, 25 °C) by reacting 10.0 g Mg with an excess of hydrochloric acid
Answer:
Mg + 2 HCl ⇒ MgCl₂ + H₂
10.1 L
Explanation:
Step 1: Write the balanced equation
Mg + 2 HCl ⇒ MgCl₂ + H₂
Step 2: Calculate the moles corresponding to 10.0 g of Mg
The molar mass of Mg is 24.31 g/mol.
10.0 g × 1 mol/24.31 g = 0.411 mol
Step 3: Calculate the moles of H₂ produced from 0.411 moles of Mg
The molar ratio of Mg to H₂ is 1:1. The moles of H₂ produced are 1/1 × 0.411 mol = 0.411 mol
Step 4: Calculate the volume occupied by 0.411 moles of H₂
0.411 moles of H₂ are at 1.00 atm and 25 °C (298 K). We can calculate the volume occupied using the ideal gas equation.
P × V = n × R × T
V = n × R × T / P
V = 0.411 mol × (0.0821 atm.L/mol.K) × 298 K / 1.00 atm = 10.1 L
When elements chemically combine with each other, what do they Form? A. electrons, B. compounds, C. atoms
Answer:
B
Explanation:
When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).
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What story does Ms. McDermid share about maggots helping identify a dead man?
Answer:
The maggots had traces of this man in them and the entomologists found out who he was just by using the DNA in the maggots.
Explanation:
Answer:
She shares how there were maggots found in an empty house and found cocaine on them. By this, they knew that the maggots had been feeding off human remains. They were then able to run more tests and find DNA that were on these maggots and they were able to discover who the victim was.
A perfect cube of aluminium metal was found to weigh 20.00g ,the density of the aluminium is 2.70g/ml ,what are the dimensions of the cube
Answer:
1.95cm x 1.95cm x 1.95cm
Explanation:
20.00g / 2.70g/mL = 7.41 mL = 7.41 cm^3
∛7.41 = 1.95cm
what is carboxylic acid
Carboxylic acids.
Answer:
Carboxylic acid is an organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid. It is used in the production of polymers, biopolymers, coatings, adhesives, and pharmaceutical drugs. They also can be used as solvents, food additives, antimicrobials, and flavorings.
Explanation:
Hope that helps.
What is said to have occurred when an object experiences a frequency equal to its natural frequency?
frequency
diffraction
resonance
amplitude
Answer: Resonance
Explanation:
A resonance is said to occur when an object experiences a frequency that is equal to its natural frequency.
A resonance refers to the sound that's produced by an object when the object vibrates at an identical rate as the sound waves that is coming from another object.
Therefore, the correct option is C
Which shows a triglyceride?
Answer:
A
Explanation:
A triglyceride (TG, triacylglycerol, TAG, or triacylglyceride) is an ester derived from glycerol and three fatty acids (from tri- and glyceride). Triglycerides are the main constituents of body fat in humans and other vertebrates, as well as vegetable fat.
The structure of option A shows a triglyceride.
What is triglyceride?Triglycerides are a kind of fat present in the blood. Triglycerides are the types of stored fats, which are not in use currently.
The structure of triglyceride is TRI esters containing glycerol bound to three fatty acid molecules.
Thus, the correct option is A.
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