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
Question 5
2 pts
To determine the density of an irregularly shaped object, a student immersed the object in 32.2 mL of water in a graduated cylinder, causing the level of the water to rise to 37.8 ml. If the object had a mass of 12.4 g, what is the density of the object?
O 0.32 g/mL
O 1.4 g/mL
O 3.4 g/mL
O 2.2 g/mL
Help quick right answer gets brainliest !!
Answer:
Explanation:
2.2 g/mL is the answer.
How many minutes will it take to plate out 4.50 g of Cu from a solution of Cu(NO3)2 (aq) onto the cathode of an electrolytic cell when 8.00 A of current are used?
a. 28.5 min.b. 3.06 × 10^−9 min.c. 14.2 min.d. 1.82 × 10^3 min.
Answer:
a. 28.5 min
Explanation:
The computation of the number of minutes would it take to plate out is as follows:
Cu+2 +2e [tex]\rightarrow[/tex]Cu
The two moles of electrons could be generated for the copper i.e. deposited
Now
moles of copper is
= 4.5 ÷ 63.5
= 0.071
The 63.5 represents the atomic copper weight
Now mole of electrons deposited is
= 0.071 × 2
= 0.142
Now
quantitiy of electricity needed
= moles of electrons deposited × 96500
= 0.142 × 96500
= 13703 coulums
As per electricity quantity needed
= current × time(seconds)
= 13703 = 8 × t
t = 13703 ÷ 8
= 1713 seconds
= 1713 ÷ 60 minutes
=28.5 min
hence, the correct option is a.
Find the element:
1. A group 12 metal that was once used in thermometers, but now it’s know to be poisonous.
2. Has 3 valence electrons and 4 energy levels.
4. The only metalloid with 3 valence electrons.
5. It’s most common isotope has 5 neutrons.
Answer:
.
Explanation:
mercurygalliumboronberylliumHeat energy always moves in which direction?
Group of answer choices
Large objects to small objects
Dark objects to light objects
Warm objects to cool objects
Smooth objects to rough objects
Answer:
large object to small objects
Answer:
The answer is C or warm objects to cool objects
Explanation:
Heat is the thermal energy flows from one substance to another when the substances differ in temperature. When you drink hot chocolate the heat from the liquid will flow to your mouth.
Iron(III) nitrate + potassium sulfide product names
Compare and contrast the mass of the object to the size of the object.
need help with this.............................................
Answer:
fossil layers
Explanation:
According to the CDC, influenza is a respiratory illness caused by the flu virus. Some of the symptoms include cough, sore throat, muscle aches, and vomiting.
Which statement represents a reasonable claim about the effects of the flu virus on the body’s ability to maintain homeostasis?
A
Influenza affects one major system, which must work to restore homeostasis.
B
Influenza affects one system, but multiple systems must interact in order to restore homeostasis.
C
Influenza affects multiple systems and multiple systems must interact in order to restore homeostasis.
D
Influenza affects one major system and secondary systems, but the major system works to restore homeostasis.
Answer:
B. Influenza affects one system, but multiple systems must interact in order to restore homeostasis.
Explanation:
According to the CDC, influenza is a respiratory illness caused by the flu virus of which some symptoms include cough, sore throat, muscle aches, and vomiting.
The statement that represents a reasonable claim about the effects of the flu virus on the body’s ability to maintain homeostasis is that it affects one system which is the RESPIRATORY SYSTEM but multiple systems must intervene in other to maintain homeostatis.
*Homeostatis is the unique way a human body or organism stabilises its internal state despite the changes on the external.
In the case of a rigid rorator, i.e. two masses M1 and M2 placed on a rigid weightless rod, we start from the Schrodinger equation for two particles 1 and 2, and then we separate the movement of the center of masses. Give the formulas of both masses that we get as part of this procedure. Calculate these masses in atomic mass units for the HD molecule by approximating the masses H and D with their mass numbers.
Answer:
Masses in atomic mass units for the HD molecule by approximating the masses H and D with their mass numbers is explained below in complete detail.
Explanation:
Two volumes M1 and M2 are located on a rigid weightless rod in a rigid rotor position. Energy in a rigid rotator example: E = BJ(J+1) where, B = h/8pi2Ic, B is rotational regular, I is moment of inertia = ur2 where u is decreased mass = m1m2/m1+m2.
FOR HD MOLECULE: mass, u = mass of H*mass of D/mass of H + D. Atomic mass unit =1.67*10^-27 kg. So, u = 1*1.67*10-24 * 2*1.67*10-24 / 1.67*10-24+2*1.67*10-24 = 1.67*10-24*2/3 = 1.11*10-24 g.
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
Answer:
A
Explanation:
True or False
ATP energy is used to move muscles and build protein in your body
bonds. Carbon dioxide has a. Ionic b. Covalent c. Nonpolar covalent d. Polar covalent
Answer:
B
Explanation:
Covalent bond.
Which property of an ice cube will stay the same after the ice cube is melted?
A. Shape
B. Physical state
C. Mass
D. Texture
Answer:
C. Mass
Explanation:
Which type of reaction is NaCl + AgNO3 → NaNO3 + AgCl?
synthesis
decomposition
oxidation
replacement
Answer:
replacement
Explanation:
is 4 Fe + 3 O2 --> 2 Fe2O3
balanced?
Answer:
Yes the given equation is balanced.
Explanation:
Chemical equation:
Fe + O₂ → Fe₂O₃
Balanced chemical equation:
4Fe + 3O₂ → 2Fe₂O₃
There are four iron and six oxygen atoms on both side of equation thus the given equation is balanced.
The given reaction also follow the law of conservation of mass.
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
This reaction is synthesis reaction:
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
A + B → AB
Help with this question pleasee
Rust has the same properties as iron
True
False
Answer:
false
Explanation:
A. What is the frequency of light that has a wavelength of 6.2 x 10^-7 m?
B. Identify the color of this light.
C. Calculate the amount of energy given off by this atom.
Answer:
I think the answer is letter C
At room temperature, one of the molecules is a gas and one is a liquid. Identify which structure is a gas and which is a liquid.
Can someone plz help-
Answer:
The answer is 3 :)
Answer: 3. a bottle that was broken into many small pieces
Which of the following best defines an allotrope?
Question 1 options:
Crystalline forms
Carbon atoms
Different forms of the same element
Similar bonding arrangements between atoms
Answer:
hi buddy!! here is ur ans: carbon atoms
Why are standard electrode potentials usually measured at 1.0 M electrolyte concentration?
Answer:
To avoid variation due to concentration
Explanation:
Hope this helps :)
please help this makes no sense to me!!
Answer:
potassium nitrate= KNO3 ---> KNO2 + O2 and a gas evolution reaction
Explanation:
i think
is this right or wrong ? pls help rn
your answer is correct good luckk!!!:)
Directions: Read the paragraph and identify the correct words that fit in the given sentences
inside the box. Write your answer in a separate sheet of paper.
Elements
non-metal
chemical process components
metal
more
properties
metalloids
properties
Compounds
one
chemical
are made up of
Elements and Compounds are all around us. (1)
utumn or atoms of the same kind. They are the simplest type of matter and cannot
be broken down into components. Each element is made entirely from (2)
type of atom. Each element is unique and no two elements have the same set of
(3)
Some are in the same state but they have (4)
properties.
Some elements are (5) like iron, gold and silver. Others are (6) like
Nitrogen, Oxygen and Ilydrogen. There are elements that are (7)
like
Boron. Silicon and Germanium.
(8)
are combination of (9)
or (10)
elements
like water which is a combination of Hydrogen and Oxygen; salt which is made
up of sodium and chlorine; and rusts formed when an iron reacts with oxygen.
Compounds can be broken down into it's (11) through a (12)
process and formed when two elements are combined together. It has unique
properties that are different from the properties of the elements that make them
Answer:
1. Elements
2. one
3. properties
4. Chemical
5. metal
6. non-metal
7. metalloids
8. Compounds
9. one
10. more
11. components
12. chemical process
Explanation:
In the given paragraph a brief about the difference between element and compound is given.
Elements are made up of the same type of atoms and each element is made up of one atom, that is they cannot be broken down into any other substance. Each element is different from each other due to its properties, though some have the same physical properties but are different in chemical properties. Elements can be classified as metals such as iron and silver, non-metals such as oxygen and hydrogen, and metalloids such as boron and silicon.
Compounds are a combination of one or more elements such as water and salt. Compounds can be easily broken down into components through a chemical process.
Hence, the correct answer is:
1. Elements
2. one
3. properties
4. Chemical
5. metal
6. non-metal
7. metalloids
8. Compounds
9. one
10. more
11. components
12. chemical process
35. Which subatomic particle has almost no mass relative to the others: the proton, the neutron or the electron?
Answer:
electron
Explanation:
it has very little mass
how many moles is 8.72x10^24 atoms? can you solve the equation too?
Answer:
14.49 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.72 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.48504...[/tex]
We have the final answer as
14.49 molesHope this helps you
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
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.
To learn more about mass percentage, here:
https://brainly.com/question/27429978
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Which of these elements does not bond with other elements to form molecules?
Group of answer choices
Neon
Sulfur
Oxygen
Chlorine
Answer:
Explanation:b
During which step of this procedure does a chemical change occur?
A. 1
B. 2
C. 3
D. 4