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Related Questions
Help with this question pleasee
Answers
How many molecules of glucose (C6H12O6,M=180.18g/mol) are contained in 144mL of 0.280 M glucose solution?
Answers
Volume of Glucose solution = 144 mL OR 0.144 L
Molarity of Glucose solution = 0.280 M
Number of moles of Glucose in the solution:From the definition of Molarity, we know that:
Molarity = number of moles / volume(in L)
in this equation, multiplying both sides by Volume, we get:
number of moles = Molarity*Volume(in L)
replacing the variables
Number of moles = 0.280*(0.144L)
Number of moles = 0.04
Number of Molecules in the solution:
We know that:
Number of molecules = Number of Moles * Avogadro's number
Number of molecules = 0.04 * 6.022 * 10²³
Number of molecules = 0.24088 * 10²³
Number of molecules = 2.4088 * 10²²
Therefore, there are 2.4088 * 10²² molecules of Glucose in the given solution
The percent by mass of Ca in CaCl2 is equal to
1. (40/111) x 100
2. (111/40) x 100
3. (3/1) x 100
4. (1/3) x 100
Answers
Answer:
(40/111)×100Here is a bonus Answer✍️✍️Percent composition by elementElement Symbol Mass PercentChlorine Cl 63.888%Calcium Ca 36.112Mass percentage does not have any unit as numerator and denominator contains the same unit. The percent by mass of Ca in CaCl[tex]_2[/tex] is equal to (40/111) x 100. The correct option is option A.
What is percentage by mass?Mass percentage represents the the percentage of each element that is making a particular compound.
Mathematically,
Percentage of mass = (component’s mass ÷ total mass) x 100%
Atomic weight of different element of calcium chloride{ CaCl[tex]_2[/tex]} are
Ca = 40 ; Cl = 35
Total mass of Calcium element in calcium chloride = 40g/mol
Total mass of Chlorine atom in calcium chloride = 35× 2= 71g/mol
Total molar mass of calcium phosphate = 40 +71= 111g/mole
Percentage of calcium in calcium chloride =40÷111 = 36%
Therefore, the percent by mass of Ca in CaCl2 is equal to (40/111) x 100. The correct option is option A.
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ADD NOTE
O QUESTION
1. A student notices that the moon is full one evening. Which sequence of moon phases
will the student observe over the next eight days?
O
Full, waxing gibbous, new, waning crescent
O
Full, waning gibbous, first quarter, waning crescent
O
Full, new, waning gibbous
O
Full, waning gibbous, third quarter
CLEAR AL
oooo
Answers
Shifts in the rock layer locations cannot account for gaps in the rock record
true or false
Answers
Answer: That would be false because it is the contact between two layers representing a gap in the geologic record, usually from the erosion of the layers which would normally be expected to appear.
Explanation:
Have a good day
I hope this helps if not sorry :(
Stay motivated
Explain how kingdoms and domains are different.
Answers
Answer: A domain is a taxonomic category above the kingdom level. The three domains are: Bacteria, Archaea, and Eukarya, which are the major categories of life. Essentially, domains are superkingdoms. A kingdom is a taxonomic group that contains one or more phyla. The four traditional kingdoms of Eukarya include: Protista, Fungi, Plantae, and Animalia.
Explanation:
Answer:
A domain is a taxonomic category above the kingdom level. The three domains are: Bacteria, Archaea, and Eukarya, which are the major categories of life. ... A kingdom is a taxonomic group that contains one or more phyla. The four traditional kingdoms of Eukarya include: Protista, Fungi, Plantae, and Animalia.
Explanation:
hope you get a good grade lol I'm in FLVS and this was one of my questions :D
How many significant figures
are in this number?
21.00
Answers
Answer:
4
Explanation:
the significant figures are 2 1 0 0
What are new substances formed in a chemical reaction called?
Answers
Answer:
Products
Explanation:
Reactants → Products
Chemical reactions are characterized by the formation of new products, and the making and breaking off strong chemical bonds.
Answer: They are the PRODUCTS of the reaction.
Explanation: In a chemical reaction, there are the REACTANTS and the PRODUCTS.
The reactants are the "ingredients" in the chemical formula. They are what are being chemically combined in a way.
The products are the "meal," or what the reactants combined to create.
For example, when creating salt or NaCl, this is essentially the formula:
Na + Cl = NaClIn this formula, Na (sodium) and Cl (chlorine) are the reactants. NaCl (sodium chloride, aka salt) is the product.
I hope this clears things up, and I hope this was the context in which the question was asked!
need help with this........................................................
Answers
Identify each of the following:
most metallic Ge or Sb
largest atomic radius Sn or Bi
highest ionization energy Cl or Sb
Answers
Largest atomic radius: Bi
Highest ionization energy: Cl
Could you mark me as brainliest?
How many mL of O2 at STP are produced from 1.5 g KClO3
Answers
Answer:
64.2 L
i watch videos about this stuff because my grades were very low now im bringing the up
Explanation:
In order to be able to calculate the volume of oxygen gas produced by this reaction, you need to know the conditions for pressure and temperature.
Since no mention of those conditions was made, I'll assume that the reaction takes place at STP, Standard Temperature and Pressure.
STP conditions are defined as a pressure of
100 kPa
and a temperature of 0∘C
. Under these conditions for pressure and temperature, one mole of any ideal gas occupies
22.7 L
- this is known as the molar volume of a gas at STP.
So, in order to find the volume of oxygen gas at STP, you need to know how many moles of oxygen are produced by this reaction.
The balanced chemical equation for this decomposition reaction looks like this
2KClO3(s]heat×−−−→2KCl(s]+3O2(g]↑⏐
Andesitic rock is an igneous rock with a composition in between that of basaltic and granitic igneous rock.
true or false
Answers
Which equation best represents the balanced net ionic equation for the reaction that occurs when aqueous solutions of lithium phosphate and magnesium nitrate are mixed?
Answers
Answer:
2 PO₄³⁻(aq) + 3 Mg²⁺(aq) ⇒ Mg₃(PO₄)₂(s)
Explanation:
Let's consider the molecular equation that occurs when aqueous solutions of lithium phosphate and magnesium nitrate are mixed.
2 Li₃PO₄(aq) + 3 Mg(NO₃)₂(aq) ⇒ 6 LiNO₃(aq) + Mg₃(PO₄)₂(s)
The complete ionic equation includes all the ions and insoluble species.
6 Li⁺(aq) + 2 PO₄³⁻(aq) + 3 Mg²⁺(aq) + 6 NO₃⁻(aq) ⇒ 6 Li⁺(aq) + 6 NO₃⁻(aq) + Mg₃(PO₄)₂(s)
The net ionic equation includes only the ions that participate in the reaction and insoluble species.
2 PO₄³⁻(aq) + 3 Mg²⁺(aq) ⇒ Mg₃(PO₄)₂(s)
Why are standard electrode potentials usually measured at 1.0 M electrolyte concentration?
Answers
Answer:
To avoid variation due to concentration
Explanation:
Hope this helps :)
what does the changing the Aperture do when taking a photo? *
4.What effect can you get from using a slow shutter speed? *
5.What effect can you create by using a quick shutter speed
Answers
Answer:
Slower shutter speeds like 1/60 second and slower cause a blurring effect. If you want to take a picture using a slow shutter speed, it is best to mount the camera on a tripod and use image stabilization (such as SteadyShot® technology) to reduce the chance of any unwanted camera movement.
The first big effect of it is motion blur. If your shutter speed is long, moving subjects in your photo will appear blurred along the direction of motion. ... If you use an especially fast shutter speed, you can eliminate motion even from fast-moving objects, like birds in flight, or cars driving past.
Explanation:
Magnesium bromide is an ionic compound with the chemical form MgBr2 what does the 2 tell you
Answers
Answer:
The number of Bromine combining magnesium
Explanation:
The subscript gives the number of atom/s combining to form a compound. For this problem, 1 atom of Mg combines with 2 atoms of Br.
To form the ionic combine, Mg will lose two electrons. A bromine atom requires just one electron to have a complete octet. So, two bromine atoms will be needed to complete the bonding process.
Therefore, Mg loses two electrons to two Br atoms and the electrostatic attraction from the charges created forms the ionic bond.
The number 2 represents the number of bromine atoms.
An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).The element losing electron (metal) forms a positive ion known as a cation while the element gaining electron (non-metal) forms a negative ion known as an anion.Magnesium bromide is formed by the combination of magnesium (metal) and bromine (non-metal).
The valency of magnesium is 2 while that of bromine is 1. To form a neutral compound 2 moles of bromine ion combines with 1 mole of magesium ion.
Thus, the number 2 represents the number of bromine atoms.
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35. Which subatomic particle has almost no mass relative to the others: the proton, the neutron or the electron?
Answers
Answer:
electron
Explanation:
it has very little mass
Copper(I) complexes tend to be tetrahedral rather than octahedral or square planar. Why is this the case? Explain your reasoning.
Answers
Answer:
The ion is d^10
Explanation:
Tetrahedral geometry is one in which the central atom/ion is located at the center of four ligands positioned at the corners of a tetrahedron.
It is different from a square planar complex wherein the ligands are positioned at the corners of a square with the central atom/ion at the center of the square.
Tetrahedral complexes are more common with d^10 species.The electronic configuration of Cu I is [Ar]3d104s1. Hence, a tetrahedral geometry is preferred over a square planar geometry.
In metallic bonding, the electrons A. are unable to move. B. are shared between two single atoms. C. are given to one atom by another atom. D. are in a "sea" around the protons of all the metal atoms.
Answers
Answer: I think it’s A.
Explanation:
Tell me if it’s wrong sorry, I am only in middle school level science.
is na2o a element or compound
Answers
Answer:
Its a compound :PP
Explanation:
have a good day
Answer:
Compound
Explanation:
What word is used to refer to a group of organ systems working together? organism cell tissue organ
Answers
Organism word is used to refer to a group of organ systems working together. Hence, option A is correct.
What is a cell?In biology, the smallest unit can live on its own and that makes up all living organisms and the tissues of the body.
An organ system is two or more organs working together to perform a specialized function.
Hence, organism word is used to refer to a group of organ systems working together.
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CAN YOU PLZ HELP ME ITS TIMED BRAINLIEST!
ONLY ANSWER IF YOU KNOW THE ANSWER PLZ!
The diagram shows two chromosomes paired up.
Which process is being shown?
sexual reproduction
independent assortment
crossing over
chromosome separation
Answers
Answer:
the sexual reproduction
Explanation:
What do you think is the common link between each of the phenomena shown?
Answers
Answer:
sounds wave
Explanation:
From alarm, microwave, laser, TV, water waves and a musical instrument, everything release sounds.
(Not the same)
If it convinced you please add this in the brainlist
Why is it important to know which category of microorganism has caused an infection?
Select one:
a. Treatment depends on which kind of organism caused the infection.
b. Probiotic infections can actually worsen some conditions.
c. Some infections can indicate cancer.
d. Some types of infections are highly contagious.
PLEASE ANSWER QUICKLY
Answers
Answer:
A
Explanation:
Use scientific notation to express the number 355000 to:
1) one significant figure
2) two significant figures
3) three significant figures
4) four significant figures
5) six significant figures
Answers
Answer:
1) 4*10^5
2) 3.6*10^5
3) 3.55*10^5
4) 3.550*10^5
5) 3.55000*10^5
Explanation:
1) 4 x [tex]10^5[/tex]
2) 3.6 x [tex]10^5[/tex]
3) 3.55 x [tex]10^5[/tex]
4) 3.550 x [tex]10^5[/tex]
5) 3.55000 x [tex]10^5[/tex]
What is scientific notation?A number is written in scientific notation when there is a number greater than or equal to 1 1 11 but less than 10 10 1010 multiplied by a power of 10 10.
Significant figures are the number of digits in a value, often a measurement, that contributes to the degree of accuracy of the value.
1) 4 x [tex]10^5[/tex]
2) 3.6 x [tex]10^5[/tex]
3) 3.55 x [tex]10^5[/tex]
4) 3.550 x [tex]10^5[/tex]
5) 3.55000 x [tex]10^5[/tex]
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FeO+ PdF2 ---> FeF2+PdO balance please worth 50 points
Answers
Answer: FeO
Explanation:
Answer:
This is not worth 50 points liar
Explanation:
How many moles of aluminum are equivalent to 4.816 × 1024 atoms?
A.12.5
B.8
C.1.25
D.08
Answers
Answer:
6.591
Explanation:
= 6.951 moles
Answer: 8
Explanation:
Which best describes a difference between energy transformation in power plants and dams?
Answers
Answer:
Which best describes a difference between energy transformations in power plants and dams? Only power plants use fossil fuels to transform energy. Only dams use fission to generate thermal energy. ... Only dams use mechanical energy to produce electricity.
Explanation:
HOPE THIS HELP
PICK ME AS THE BRAINLIEST
Help lol please lol thank you :)
Answers
Answer:
45
Explanation:
Answer:
45 lol
Explanation:
List three things, other than the name, symbol, atomic number, and average atomic mass, you can discover about an element using the periodic table in Figure 6.9.
Answers
Answer: State of matter, Subcategory in the metal-metalloid-nonmetal trend, and electrons per shell.
Explanation: