2HCl + Mg => MgCl2 + H2
which best describes nuclear energy?
A the energy that matter has due to the vibrations of its particles
B the energy an object has due to its chemical bonds
C the energy generated by a flow of electrons
D the energy stored inside the center of an atom
Answer:
The correct answer is - D. the energy stored inside the center of an atom.
Explanation:
Each atom has a small center in it called the nucleus and the energy that holds the nucleus or center of the atom together in the atom is known as nuclear energy.
It is the energy that is stored in the center of the atom and normally does not come out, however, in some radioactive atoms the sends some part of the energy as radiation.
Thus, the correct answer is - D. the energy stored inside the center of an atom.
Oxit bazơ có những tính chất hóa học nào?
Answer:
tác dụng với acid,
Explanation:
Magnesium and Hydrochloric acid (HCl) react to form magnesium chloride (MgCl2) and hydrogen gas. If you started with 65.8 g of magnesium and 45.7 g of hydrochloric acid. What is the limiting reactant? Ensure you post calculations to prove your answer. (3 marks)
Answer:
Cl
Explanation:
n for Mg=m:Mm
=65.8:24
=2.74mol
n for Cl=m:Mm
=45.7:70
=0.65mol
According to the number of moles we can say that the limiting reagent is Cl as it has few moles.
Limiting agents are the reactant that determines the amount of the product in a reaction. In the reaction between magnesium and hydrochloric acid, the limiting reagent is HCl.
What is a limiting reagent?A limiting reagent is a substance that restricts or determines the amount of product formation in a reaction. They are the reactants with less number of moles and get consumed in the reaction before the other reactant.
The reaction between magnesium and hydrochloric acid is given by,
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H2(g)
Here, 1 mole of Mg and 2 moles of HCl are required to produce 1 mole of magnesium chloride.
The moles of Mg,
= 65.8 g ÷ 24.305
= 2.707 mol
And, moles of HCl
= 45.7 g ÷ 36.458
= 1.253 mol
The stoichiometric ratio Mg : HCl = 1:2
Hence, Mg = 2.707 ÷ 1 = 2.707 and HCl = 1.253 ÷ 2 = 0.6265
Therefore, HCl is the limiting reagent.
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WM "Please write the molecular formula for the following by criss cross method. 1. Calcium nitrate 2. Sodium bicarbonate 3. Magnesium nitrite 4. Sodium chloride 5. Hydrogen sulphate 6. Hydrogen chloride T-Aluminium bisulphate 8 Aluminium chloride 9. Aluminium sulphate 10. Hydrogen Nitrate
Answer:
1 Ca(NO3)2
Calcium- Ca, Valency 2
Nitrate- NO3, Valency 1
AFTER CRISS CROSS:
Ca1(NO3)2
Ca(NO3)2
2 sodium bicarbonate = NaHCO3
Na = Sodium = (Na)+
HCO3 = bicarbonate = (HCO3) -
Na HCO3
3 magnesium nitrite
+2 _ 1
Mg2(NO3)2
4 Na Cl
+1 _1
formula NaCl
5 hydrogen sulphide
H SO4
+1 _2
formula H2SO4
6 H Cl
+1 _1
HCl
7 AL2 HSO4
+2 -2
AL2(HSO4)3
8 NH4 Cl
+1 _1
NH4Cl
9 NH4 SO4
+1 _2
(NH3)2SO4
10 H NO3
+1 _1
HNO3
which is the following is a vector quality?
ans:
1)mass
2)speed
3)time
4)plane area
Answer:
speed
Explanation:
hope it helps
keep smiling
How many chlorine (CI) atoms are in Methylene?
Answer:
None
Explanation:
Methylene is an organic compound and organic compounds consist of hydrogen atoms and Carbon atoms in n this case Methylene(CH2) has one carbon and two hydrogens .
Answer: methylene doesn't contain CL(chlorine) atoms
Explanation: the chemical formulae for Methylene is CH2
which means it contains only carbon and hydrogen atoms which is 1(one) carbon 2(two)hydrogen atoms
HOPE THIS HELPS!!
hii pls help me to balance the equation and state the symbols thanksss
Answer:
I hope that the link above will be helpful
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
[tex]\boxed{\pmb{\green{\sf{2Mg +H_{2}SO_{4}\dashrightarrow H _{2}+Mg_{2}SO_{4}}}}}[/tex]
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
list three factors that affect the rate of a chemical reaction
Answer: 1) temperature, 2) add a catalyst, and 3) concentrations
Explanation: A rise in temperature adds kinetic energy to the reactants, leading to more frequent, and energetic collisions, which will often accelerate the reaqction. A catalyst is an agent that helps the reaction move forward more quickly by offering a substrate that aids in orienting the reactants for more efficient reaction. A higher concentration increases the chances of collisons that result in products.
Between volume and mass which gives a larger source of error in the determination of density? Explain why.
Answer:
volume gives a larger source of error in determination of density
Answer:
Density and volume are inversely proportional. The greater the volume, the lower the density.
Density= Mass/ Volume
Explanation:
What is Density?Density= Mass/ Volume
A volume error may be due to the measuring instrument used. Different instruments have different resolutions, and therefore varying percentage uncertainties. An instrument with a higher resolution has a lower percentage error. A pipette will give a more accurate reading compared to a beaker. Density and volume are inversely proportional. The greater the volume, the lower the density.
Parallax error could also lead to inaccurate volume readings. The volume reading must be taken below the meniscus for a liquid such as water and above the meniscus for a liquid such as mercury.
Another source of error is the measurement of mass. Instruments that are used to determine mass have different percentage uncertainties. An electronic weighing scale is most likely to give an accurate reading. Density is directly proportional to mass. The greater the volume of the liquid, the greater its density.
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Usually scientists do not specialize and study one aspect of the
natural world, but will focus on many aspects to understand
why and how things happen.
TRUE
FALSE
Convert solar day into mintues
Answer:
There are 24*60 minutes in a day (ignoring the imperfections of the natural world, the Earth and Sun). So there are 24*60 valid 24 hour times (excluding seconds) on a digital clock.
A measure of time representing the interval between consecutive passages of the Sun across the meridian, averaged over one year. 1 day = 24 hr (86,400 sec) and 60 minutes.
hope it helps ya mate! :-P
How many Calcium (CA) Atoms are in Calcium Oxide
Calculate the amount of mole(s) of CoF2 required to react with 12.8 moles of HCI.
CoCl2 + 2HF --> CoF2 + 2HCI
Explanation:
here's the answer to your question
Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na and Cl- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt
Answer:
See explanation
Explanation:
The addition of an impurity lowers the melting point of a solid. If we add salt to ice, the melting point of the ice is lowered.
As this salty water is in contact with the ice, more of the salt dissolves to yield Na^+ and Cl^- and leads to the melting of more ice.
Freezing point is a colligative property hence it is affected by the presence of impurities. Hence, the addition of NaCl causes ice to melt faster.
How the amount of acid rain caused by the burning of fossil fuels can be reduced ?
Answer:
The amount of acid rain caused by the burning of fossil fuels can be reduced by creating nitrogen oxides in the process of burning coal and other fossil fuels, some power plants are changing the way they burn coal. A great way to reduce acid rain is to produce energy without using fossil fuels. Instead, people can use renewable energy sources, such as solar and wind power.
Temperature is measured in degrees C whereas heat is measured in
J
m
t
q
Answer:
J
Explanation:
Heat is measured in Joules (J)
A sample of a gas is kept at constant pressure while
its temperature is cooled from 100°C to 0°C. What
was its original volume if its final volume is 1.83 L?
Explanation:
here's the answer to your question
Temperature and kinetic energy have, what type of relationship
Answer:Calor y temperatura son dos conceptos diferentes pero estrechamente relacionados. Observa que tienen diferentes unidades: la temperatura típicamente tiene unidades de grados Celsius (^\circ\text C
∘
Cdegrees, start text, C, end text) o Kelvin (\text KKstart text, K, end text), y el calor tiene unidades de energía, joules (\text JJstart text, J, end text). La temperatura es una medida de la energía cinética promedio de los átomos o moléculas en el sistema. Las moléculas de agua en una taza de café caliente tienen una mayor energía cinética promedio que las moléculas de agua en una taza de té helado, lo que también significa que están moviéndose a una velocidad más alta. La temperatura también es una propiedad intensiva. Esto significa que no depende de qué tanta cantidad tengas de una sustancia (¡siempre y cuando esté toda a la misma temperatura!). Por esta razón, los químicos pueden utilizar el punto de fusión para poder identificar una sustancia pura: la temperatura a la cual se derrite es una propiedad de la sustancia que no depende de la masa de una muestra.
A nivel atómico, las moléculas en cada objeto están constantemente en movimiento y chocando entre sí. Cada vez que chocan, pueden transferir energía cinética. Cuando dos sistemas están en contacto, se va a transferir calor del sistema más caliente al más frío por medio de choques moleculares. La energía térmica va a fluir en esa dirección hasta que los dos objetos están a la misma temperatura. Cuando esto ocurre, decimos que están en equilibrio térmico.
Explanation:
Al calor a veces se le llama una magnitud de proceso, porque está definido en el contexto de un proceso por el cual se puede transferir energía. No decimos que una taza de café contiene calor, pero podemos hablar del calor transferido de la taza de café caliente a tu mano. El calor también es una propiedad extensiva, así que el cambio de temperatura que resulta al transferir calor a un sistema depende de cuántas moléculas hay en el sistema.
If a 10.0 g piece of metal required 100 cal to raise its temperature
by 20°C, what would you report as its specific heat?
a. 10 cal/g·°C
b. 200 cal/g·°C
c. 0.5 cal/g·°C
d. 2 cal/g·°C
Answer:
C. 0.5 cal/g°C
Explanation:
Using the following equation:
Q = m × c × ∆T
Where;
Q = amount of heat absorbed/released (calories)
m = mass of substance (g)
c = specific heat capacity (calg/°C)
∆T = change of temperature (°C)
According to the information provided in this question;
m = 10g
c = ?
∆T = 20°C
Q = 100cal
Using Q = m × c × ∆T
c = Q ÷ (m × ∆T)
c = 100 ÷ (10 × 20)
c = 100 ÷ 200
c = 0.5 cal/g°C
which is the answer?
Answer:
I could be wrong letter c
What's a third reaction? (Chemistry)
Explanation:
a chemical reaction in which the rate of reaction is proportional to the concentration of each of three reacting molecules
In ionic bonding Question 41 options: the electrons are shared between the atoms. the process of forming an ionic bond is highly endothermic overall. the bonding that occurs is usually between two nonmetal atoms. a noble gas configuration is formed for each element or ion. At least two of the above statements are correct.
Answer: In ionic bonding (a noble gas configuration is formed for each element or ion).
Explanation:
IONIC bonding, which is also called electrovalent bonding involves the complete transfer of electrons from one atom to another in order to attain a noble gas electron configuration.
The noble gases or group 0 elements have a completely filled outermost shell of eight electrons. This makes them generally very stable, that is, unreactive. There is a natural drive for other atoms to attain the electron configuration of group 0 (inert gases) elements. This usually results in atoms entering into chemical combinations by losing, gaining or sharing electrons.
Ionia compound such as sodium chloride
--> have high melting points because alot of heat energy is required to break the attractive forces between the ions;
--> are hard and brittle;
--> are soluble in water;
--> conduct electricity when in solution or molten form because the ions are able to move about, that is, they are electrolytes
A phase change from a solid to a gas is called:
Answer:
sublimation
Explanation:
Explain how the existence of ions relates to the number of electrons present in atoms of an element? (A.P.E.X)
Answer:
if you have options please include them, but I'll give you an idea.
Explanation:
The existence of ions happens when atoms lose or gain electrons.
if an atom gains an electron it will become a negative ion (because electrons are negative, and you gained more negativity.)
if an atom loses an electron it will become a positive ion (because it has lost negativity, which is the electron that we've lost).
I hope it helps, if it does please mark me brainliest!
if 1.35 g of aluminum occupies 0.500 cm^3. what is the density of aluminum
Answer:
2.7
Explanation:
Density= mass/volume
= 1.35/0.500
= 2.7
What is the hydronium ion concentration of a solution with a pOH of 7.20?
A - 1.56 × 10^−6 M
B - 1.79 × 10^−6 M
C - 1.58 × 10^−7 M
D - 2.78 × 10^−7 M
I think the correct answer is C, can anyone confirm this?
Answer:
C - 1.58 × 10^−7 M
Explanation:
The hydroxide ion concentration can be found from the pOH by the reverse mathematical operation employed to find the pOH. [OH-] = 10-pOH or [OH-] = antilog ( - pOH) Page 2 Example: What is the hydroxide ion concentration in a solution that has a pOH of 5.70? On a calculator calculate 10-5.70, or "inverse" log (- 5.70).
The concentration of hydronium ion C) - 1.58 × 10^−7 M
The concentration of hydronium ionif pOH is 7.20 than pH = 14-7.20∴pH=6.80
The hydroxide ion concentration can be found from the pOH by the reverse
How do you calculate concentration from pH?To calculate the pH of an aqueous solution we need to know the concentration of the hydronium ion in moles per liter (molarity).
The pH is then calculated using the expression:
pH = - log [H3O+]
-log[6.80]
- 1.58 × 10^−7 M
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Do cycloalkanes easily take part in addition reactions?
Answer:
The reactions of the cycloalkanes are generally just the same as the alkanes, with the exception of the very small ones - particularly cyclopropane. ... In the absence of UV light, cyclopropane can undergo addition reactions in which the ring is broken
Aluminum reacts with a certain nonmetallic element to form a compound with the general formula AlX. Element X is a diatomic gas at room temperature. Element X must be __________. Group of answer choices oxygen fluorine chlorine nitrogen sulfur
Answer:
It's nitrogen
Explanation:
cuz it has valence 3 and a diatomic gas at room temperature
Element X must be nitrogen.
Chemical reactionThe general formula AlX indicates that aluminum (Al) is reacting with a nonmetallic element represented by X to form a compound.
Since the compound AlX is said to be a diatomic gas at room temperature, it aligns with nitrogen (N2), which is a diatomic gas and a nonmetal.
Among the given options, nitrogen is the diatomic gas that best fits this description.
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Name the property of salt investigated in the above experiment
which experiment please involve a clip
The compound KOH is ________. insoluble, because all compounds containing K are insoluble insoluble, because all compounds containing OH- are in soluble soluble, because all compounds containing K are soluble soluble, because all compounds containing OH- are soluble insoluble, because KOH is insoluble
Answer:
soluble because all compounds containing K are soluble
Explanation:
Most metal hydroxides are insoluble. However, alkali metal hydroxides (such as KOH and NaOH) are very soluble.
In the case of KOH, the K cation is attracted to the electronegative oxygen on water. The OH anion is capable of hydrogen bonding to the water. (Notice how OH⁻ is simply the deprotonated form of water.)
The compound KOH is soluble insoluble, because all compounds containing K are insoluble insoluble, because all compounds containing OH- are in soluble soluble, because all compounds containing K are soluble soluble, because all compounds containing OH- are soluble insoluble, because KOH is insoluble
What are alkalis?Alkalis are bases which are soluble in water. The basic alkalis are as follows:
KOHNaOHCa(OH)2Mg(OH)2 is insoluble in water.
In conclusion, KOH is a soluble base
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