Answers
Answer:
45
Explanation:
Answer:
45 lol
Explanation:
Related Questions
is this right or wrong ? pls help rn
Answers
your answer is correct good luckk!!!:)
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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please help this makes no sense to me!!
Answers
Answer:
potassium nitrate= KNO3 ---> KNO2 + O2 and a gas evolution reaction
Explanation:
i think
is 4 Fe + 3 O2 --> 2 Fe2O3
balanced?
Answers
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
bonds. Carbon dioxide has a. Ionic b. Covalent c. Nonpolar covalent d. Polar covalent
Answers
Answer:
B
Explanation:
Covalent bond.
During which step of this procedure does a chemical change occur?
A. 1
B. 2
C. 3
D. 4
Answers
need help with this.............................................
Answers
Answer:
fossil layers
Explanation:
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 !!
Answers
Answer:
Explanation:
2.2 g/mL is the answer.
Rust has the same properties as iron
True
False
Answers
Answer:
false
Explanation:
Draw the Lewis structure for the polyatomic amide anion(NH2-). Be sure to include all resonance structures that satisfy the octet rule.
Answers
Answer:
Following are the solution to this question:
Explanation:
Following are the lewis structure of the [tex]NH_2^{-}[/tex]:
In the given element two H and one N are used, in which N has 5 valance electrons, and one H has 1 valence which is equal to 2 electrons valance. So, the graph for the given element is defined in the attached file.
The Lewis structure for the amide anion can be shown as in the given figure.
What is Lewis structure?
Lewis structures, also known as Lewis dot formulas, are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
In the given element two H and one N are used, in which N has 5 valance electrons, and one H has 1 valence which is equal to 2 electrons valance. The Lewis structure for the amide anion can be shown
Hence, this is the required answer.
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Describe a chemical property of iron that you observed.
Answers
Answer:
Iron can rust in damp conditions. Or, it can dissolve readily in dilute acids.
Explanation:
True or False
ATP energy is used to move muscles and build protein in your body
Answers
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 :)
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
Answers
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
Iron(III) nitrate + potassium sulfide product names
Answers
Fe(NO3)3 + K2S
Then, to determine the products use the AD+CB method to form your products:
A = Fe
B = (NO3)3
C = S
D = K2
Products: Fe2S3 + KNO3
Whole equation:
Fe(NO3)3 + K2S -> Fe2S3 + KNO3
Write the balanced chemical equation:
2 Fe(NO3)3 + 3 K2S -> Fe2S3 + 6 KNO3
Compare and contrast the mass of the object to the size of the object.
Answers
Help with this question pleasee
Answers
What is the total number of moles of oxygen atoms present in one mole of Mg(CIO3)2?
1. 5
2. 2
3. 3
4. 6
Answers
Nanananabxnjajakaz
Answer:
Of oxygen would be 6 moles (4).
Explanation:
Since it is in a bracket you have to multiply 3 and tge 2 to get 6 oxygens.
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.
Answers
Answer:
I think the answer is letter C
What do you need to know about stock solution on order to calculate a dilution?
Answers
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.
Answers
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.
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.
Answers
Which of these elements does not bond with other elements to form molecules?
Group of answer choices
Neon
Sulfur
Oxygen
Chlorine
Answers
Answer:
Explanation:b
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:
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.
Answers
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.
What do the rows in the Periodic Table tell us?
Answers
Answer:
The rows tell you how many shells there are of the atom.
Using the equation pH = -log [H+], determine the pH of a solution with a hydrogen ion concentration, or [H+], of 1x10-5. HINT: look at his HCl example!
pH = 7
pH = 1
pH = 5
pH = 2
Answers
Answer:
the answer is pH of 7 I don't no Hydrochloric hijinx work
The equation pH = -log [H+], the pH of a solution with a hydrogen ion concentration is 5. Hence option c is correct.
What is solution?Solution is defined as a continuous variation of two or more substances in their relative proportions up to what is known as the limit of solubility. Light beams do not disperse in the presence of a solution. In contrast, a suspension of particles might result in Tyndall or Rayleigh scattering. The amount of heat that is released or absorbed during the dissolving process is known as the enthalpy change of solution.
pH is defined as a measurement of how basic or acidic aqueous or other liquid solutions are. A solution's pH is a significant indicator of its chemical composition. The pH can affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.
pH = -log[H+]
pH = -log[1.0 x 10⁻⁵]
pH = 5
Thus, the equation pH = -log [H+], the pH of a solution with a hydrogen ion concentration is 5. Hence option c is correct.
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Which type of reaction is NaCl + AgNO3 → NaNO3 + AgCl?
synthesis
decomposition
oxidation
replacement
Answers
Answer:
replacement
Explanation:
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
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Stay motivated
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
Answers
Answer:
hi buddy!! here is ur ans: carbon atoms