Answer:
Convert grams of Mg to moles
Explanation:
In stoichiometric calculations, the first thing is always to balance the chemical reaction equation. However, in this particular instance, the equation is already balanced; 2Mg + O2 ---------->2MgO as shown in the question.
Hence, what Niven now has to do is to convert grams of Mg to moles so that the amount of MgO obtained can be calculated and subsequently converted to mass.
What is the volume of a balloon containing 0.75 moles of gas at STP?
Answer:
V = 16.81 L
Explanation:
Given data:
Number of moles = 0.75 mol
Temperature = standard = 273 K
Pressure = 1 atm
Volume of balloon = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will rearrange the formula.
V = nRT/P
V = 0.75 mol ×0.0821 atm.L/mol.K ×273 K / 1 atm
V = 16.81 atm.L/ 1 atm
V = 16.81 L
Substance A is tested to see if it is an acid or a base. A piece of iron is placed
in substance A and the iron starts to wear away over time (corrosive).
Substance A has a sour taste, and will produce a burning/tingling feeling
when touched with a bare hand. Is Substance A an acid or a base?
Answer:
[tex]\huge\boxed{\sf Acid}[/tex]
Explanation:
An acid has the following properties:
=> Is corrosive to Iron and reacts with it.
=> Has a sour taste.
=> Produces a burning sensation when touched.
So, Substance A is an acid.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807I like someone but I don't know how to actually talk to em. HELP!
Answer:
tell how you feel
Explanation:
don't be afraid to express your feeling.
Answer:
slowly approach them and tell your feelings
Which type of animal can breed on their own but have undergone physiological or behavioral changes due to captivity?
O Undomesticated animals
O Domesticated animals
O Semi-domesticated animals
O Tamed wild animals
What causes fireworks
Answer:
Explanation:
A
Which of the following are properties of ionic compounds?
A. hard solids with high melting and boiling points.
B. soft and good conductors of electricity.
C. both A and B
D. good conductors of electricity, but only when dissolved in water
Answer:a and d
Explanation:
The properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.
What are Ionic solids?Ionic solids are made up of ions joined together by ionic bonds. "Ionic bonding" is a type of chemical bond between a positive and a negatively charged ion where the transfer of electrons occurs.
They are too hard, and the ionic solids’ melting point is usually too high due to powerful forces between the anions and cations.
They are known as electrical insulators when they are in a solid-state. Apart from this, the molten salts do behave with electricity since the ions are not closed in the lattice.
Therefore, the properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.
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**WHOEVER SOLVES THIS GETS A LOT OF POINTS
***Look at img below
Answer:
what
Explanation:
I cant see your question yet
Answer:
the question really said :
What is the correct formula for Strontium Selenide?
Answer:
(SrSe) | SeSr - PubChem.
Explanation:
__________ occurs when a gas changes directly into a solid without going through a liquid phase. *
sublimation
vaporization
condensation
deposition
Answer:
Deposition
Explanation:
Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process. The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.
we need to use the table to provide the answer, help ;-;
a. The symbol [tex]\tt _{11}^{23}Na[/tex], [tex]\tt _{18}^{40}Ar[/tex], [tex]\tt _{15}^{31}P^{3-}[/tex], [tex]\tt _{13}^{27}Al^{3+}[/tex]
b. Isotope of Na
Further explanationAtomic number=number of protons=number of electrons(neutral atom)
Number of neutrons=mass number-atomic number
Mass number=protons+neutrons
B. atomic number=11, mass number=11+12=23⇒Sodium
[tex]\tt _{11}^{23}Na[/tex]
C. atomic number=18, mass number=18+22=40⇒Argon
[tex]\tt _{18}^{40}Ar[/tex]
D. atomic number=15, mass number=15+16=31, charge -3(electron-proton)⇒Phosphor
[tex]\tt _{15}^{31}P^{3-}[/tex]
E. atomic number=13, mass number=13+14=27, charge +3(proton-electron)⇒Aluminium
[tex]\tt _{13}^{27}Al^{3+}[/tex]
Isotope=the same atomic mass, different neutron(mass number)
So the atom⇒isotope of Sodium(Na)
Can someone help me please?
Answer:
I did this already
................
A wave with a higher frequency has a longer wavelength
TRUE
FALSE
Answer:
FalseA wave with a higher frequency have a shorter wavelength, the higher the sound it, the closer the arcs of the wavelength are, the faster the sound is, the shorter they are.
According to scied.ucar.edu ~ "The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength. Light waves have very, very short wavelengths."
Hope this helps
Explanation:
May I have brainliest please? :)
A wave with a higher frequency has a longer wavelength is a false.
Relation of frequency, energy and wavelengthA wave with a higher frequency has a longer wavelength is a false statement because shorter wavelength have higher frequency and also higher energy.
We know that longer wavelength of a wave having shorter frequency and shorter energy while on the other hand, the shorter wavelength of a wave having higher frequency and higher energy so we can conclude that the statement is false.
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A compound composed of only C and H contains 79.88 % C by mass. What is its empirical formula?
C a CH 3
Ob.CH 2
Oc CH 4
0 0 CH
Оe. Сэн
Answer:
a. CH3
Hope this helps.
Barium chlorate (Ba(ClO3)2) breaks down to form barium chloride and oxygen. What is the balanced equation for this reaction? When counting atoms in parentheses multiply all subscripts by the number outside the parentheses to get the number of atoms
Answer:
C
Explanation:
The balanced equation for breakdown of barium chlorate into barium chloride and oxygen as follows: [tex]\rm 2 Ba(ClO_3)_2 \rightarrow 2 BaCl_2 + 3 O_2[/tex]
In chemistry, a balanced equation is one that depicts a reaction in which there are the same numbers of atoms of each element on both sides of the equation. The idea that matter is neither generated nor destroyed during a chemical reaction is known as the conservation of mass.
It is possible to write the equation for the balanced breakdown of barium chlorate into barium chloride and oxygen as follows: [tex]\rm 2 Ba(ClO_3)_2 \rightarrow 2 BaCl_2 + 3 O_2[/tex] . The number of atoms must be taken into consideration in this balanced equation by multiplying the subscripts inside brackets by the coefficient outside of the brackets. With the same number and kinds of atoms on both sides of the reaction, this guarantees that the equation complies with the rule of conservation of mass.
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Calculate the energy and frequency of red light having a wavelength of 6.55 x 10⁻7m.
Answer:
E = 3.035× 10-¹⁹J = 1.9eV
f = 4.58 × 10¹⁴Hz
Explanation:
wavelength = 6.55 × 10-⁷m
c = 3 × 10⁸m/s
f = ?
E = ?
a) f = c/wavelength
f = 3 × 10⁸/6.55 × 10-⁷
f = 4.58 × 10¹⁴Hz
b) E = hc/wavelength
E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷
E = 3.035 × 10-¹⁹J
1ev = 1.6 × 10-¹⁹J
Therefore E = 3.035/1.6 = 1.9eV
Yo I need help with 1 and 2
Answer:
1-
A) H2O B) HCO3-
2-
A) NH3 B) SO3-2
Explanation:
25 pointss How do the plates and mantle interact at each type of plate boundary?
Answer:
what that girl said lol
Answer:
honestly.. idk lol
Explanation:
Ethanol is a:
A. substance
B. heterogeneous mixture
C. homogenous mixture
Answer: i think it is A
Explanation:
hope this helps!
Which set of coefficients would balance the following equation
Answer:
3Mg + 2AlCl3 --> 2Al + MgCl2
The source of alpha particles in a smoke detector is the
The source of alpha particles in a smoke detector is the Americium.
How can you separate sand, sugar and gravel
Answer:
Grating
Explanation:
I think you need to grate it
Answer: The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separate
Explanation:
Copper sulfate, when it is dissolved in water, has a blue color. When steel wool is mixed with a copper sulfate solution, the steel wool disappears, a brownish solid forms, and the color of the solution changes from blue to green.
Choose one answer that gives the best evidence that a chemical reaction took place.
A. The color change from blue to green happens in nature.
B. The disappearance of the steel wool shows that a new substance has formed.
C. The solid precipitate is a waste product in the reaction.
D. Energy is lost in this reaction like all other reactions.
Which answer did you choose? Explain your reasoning.
Answer:
A. The color change from blue to green happens in nature.
Explanation:
The color change is an indicator of a chemical reaction that has occurred. Although color changes are not necessarily good diagnostic tool to measure if a chemical reaction has occurred or not.
In this reaction, color changes is quite an effective tool Chemical changes usually involves the formation of a new product from the chemical reaction. Also, the steps are not easily reversible.For this reaction, color change is the most appropriate signal for a chemical change.The evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.
The electrochemical series is arrangement of elements in order of decreasing reactivity. It is important to note that the elements that are high up in the electrochemical series can displace the elements that are lower in the series from their aqueous solution.
Steel contains iron which lies above copper in the electrochemical series hence a chemical change occurs when steel dissolves in the copper solution.
Hence, the evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.
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Please help i don’t know what to say
Answer:
Explanation:
Groundwater spread over the years
A cat that weighs 55 N sits on the top of a cat tree. It is 2 m above a 110N dog. How does the mass of the animals relate to the force of gravity on them?
*sorry I can't give a full explanation.*
g = 9.8 m/s²
w = m*g
Weight of cat: 55 N = m*9.8
m = 5.61 kg
Weight of dog: 110 N = m*9.8
m = 11.22 kg
There is gravitational potential energy (GPE) acting on the cat since it's at the very top.
GPE of cat = m*g*h = 5.61*9.8*2 = 109.96 J
GPE of dog = m*g*h = 11.22*9.8*0 = 0 J (it's 0 m height because it's on the floor instead of in the tree)
But, if the dog was also 2 m up in the tree, its GPE would be 219.91 J.
As you can see, it's GRAVITATIONAL potential energy is bigger than the cat because it weighs more. Generally, if you were just trying to find the force which is w = m*g (since weight is a force), you would see that the bigger the mass, the bigger the force, and gravity stays the same.
Hope this helped
What is this please help
Answer:
I think the answer is A. I am only 50% sure I am correct, but hope it helps!
Explanation:
What is a covalent bond?
What 2 things define the state of matter?
Answer: gas are well separated with no regular arrangement.
liquid are close together with no regular arrangement.
solid are tightly packed, usually in a regular pattern.
its just gas liquid and solid pls make me brainliest
Explanation:
How many moles are in 35.0g of sodium (Na).
Answer:
2.5 I don't have a explanation
What is the relationship between plastic and gasoline?
Answer:
Explanation:
Both plastic and gasoline are products of pretroleum
which other metal can substitute (in place of) iron explain you answer.. Aluminum, copper or iron?
Answer+Explanation:
Titanium ( in place of iron)
Titanium could be an excellent replacement for iron when it comes to tensile strength versus weight. It would be the first choice as a building material metal and building skeletons/bridges would use titanium instead of iron.
Magnesium alloys (in place of aluminum)
Magnesium alloys potentially met the present demands for lighter and reliable construction. With comparable specific stiffness, higher specific strength and energy absorption magnesium alloys have the potential to replace steel and aluminum alloys.
aluminum (in place of copper)
Most non-copper metal cabling is aluminum, and it is often used in areas where copper is not a likely alternative. However, it is used more now as a replacement than it has ever been. It is cheaper than copper, and its relative density allows for more cable to be made from a ton of aluminum than a ton of copper.
hope it helps you