Answer:
The main hazard related to organic peroxides are their fire and explosion hazards. ... It is the double oxygen of the "peroxy" group that makes organic peroxides both useful and hazardous. The peroxy group is chemically unstable. It can easily decompose, giving off heat at a rate that increases as the temperature rises.
Explanation:
What are the periodic trends of ionic radii? Check all that apply. Ionic radii tend to increase down a group. Ionic radii tend to decrease across a period. Anionic radii tend to increase across a period. Cationic radii tend to decrease across a period. Ionic radii increase when switching from cations to anions in a period.
Answer:
What are the periodic trends of ionic radii? Check all that apply.
*Ionic radii tend to increase down a group.
Ionic radii tend to decrease across a period.
Anionic radii tend to increase across a period.
*Cationic radii tend to decrease across a period.
*Ionic radii increase when switching from cations to anions in a period.
Answer:
- Ionic Radii Tend To Increase Down A Group.
- Cationic Radii Tend To Decrease Across A Period.
- Ionic Radii Increase When Switching From Cations To Anions In A Period.
Explanation:
i got it correct on edge
CAn someone help me and give me an example of a process that you notice or use each day that obyes the law of conservation of mass and explain how this process work??? please answer I need a new example not burning fire or candle or paper different helppppppppppppppppppppppppppppppppppppppppp
Answer:
photosynthesis maybe
Explanation:
bare with me i may be wrong or i may be right it's been a while since i've been in a chem classroom. so basically during photosynthesis a plant is taking the energy from the sun, H2O, and CO2, this ends up being like 6CO2 + 6H20 + (energy), and it converts this energy to glucose (→ C6H12O6 + 6O2 ) so the energy is never used up in this process it is merely changed. i don't really know but i hope it at least helps some
Which of the following is NOT an indicator of a chemical
reaction?
O A. Breaking into small pieces
OB. Producing a solid
OC. Changing color
OD. Producing light
Answer:OD. Producing light
Explanation:
select all the correct answers. Which conditions are required for nuclear fusion to begin? The gas cloud must be very dense. Gravitational attraction must stop. Atoms must be stripped of their electrons. Helium atoms must break down into hydrogen. Temperatures must exceed 14 million Kelvin.
Answer:
The gas cloud must be very dense.Temperatures must exceed 14 million Kelvin
Nuclear fusion is the process in which atomic nuclei come together to form heavier nuclei, releasing large amounts of energy in the process. The correct statements are The gas cloud must be very dense, Atoms must be stripped of their electrons, and Temperatures must exceed 14 million Kelvin.
For fusion to occur, certain conditions must be met. The gas cloud or plasma must be dense enough to allow for a sufficient number of collisions between atomic nuclei. Gravitational attraction, on the other hand, is necessary to bring the atomic nuclei close enough together for the strong nuclear force to overcome the electrostatic repulsion between positively charged nuclei.
Atoms must be stripped of their electrons because, in a plasma state, the atoms are ionized, meaning they have lost or gained electrons and exist as charged particles.
Hence, the correct statements are The gas cloud must be very dense, Atoms must be stripped of their electrons, and Temperatures must exceed 14 million Kelvin.
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Philosophy ultimately seeks to discover ultimate truth
True or false
Answer:
True
Explanation:
Phislosophy does not accept something even though it is a khown fact unless it can proves it's true .
Descartes sais that in philosophy we must doubt the facts we khow , we must start from the beginning to reach the truth
A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion. B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. C. If Assertion is true statement but Reason is false. D. If Assertion is false and Reason is true i Assertion: .Burning of magnesium ribbon produce whitish powder called magnesium oxide. Reason : Magnesium is generally cleaned by rubbing it on sand paper
Answer:
C. If Assertion is true statement but Reason is false.
Explanation:
The burning of magnesium in air produces magnesium oxide as shown by the equation;
2Mg(s) + O2(g) -----> 2MgO(s)
The magnesium oxide solid is recovered as a white ash. This is a typical example of an oxidation reaction which is also a combustion reaction.
The reason has nothing at all to do with the assertion hence the answer given.
Magnesium oxide is basic just like the oxides of other metals and dissolves in water to yield an alkali.
Answer:
Answer:
C. If Assertion is true statement but Reason is false.
Explanation:
The burning of magnesium in air produces magnesium oxide as shown by the equation;
2Mg(s) + O2(g) -----> 2MgO(s)
The magnesium oxide solid is recovered as a white ash. This is a typical example of an oxidation reaction which is also a combustion reaction.
The reason has nothing at all to do with the assertion hence the answer given.
Magnesium oxide is basic just like the oxides of other metals and dissolves in water to yield an alkali.
Explanation:
How to get a catalyst back at the end of a chemical reaction?
Answer:
You should get the catalyst back already.
Explanation:
A catalyst shouldn't be used up during a chemical reaction. It is used to speed up a reaction, but it shouldn't disappear/be used up by a chemical reaction.
Study the following reaction: NH4+(g) + NO2⁻(g) ⟶ N2(g) + 2H2O(l) How does the rate of this reaction change when the temperature is increased? A) The rate decreases because a higher temperature means that particles move at higher speeds and there are more collisions in the system. B) The rate decreases because a higher temperature means that particles move at lower speeds and there are fewer collisions in the system. C) The rate increases because a higher temperature means that particles move at lower speeds and there are fewer collisions in the system. D) The rate increases because a higher temperature means that particles move at higher speeds and there are more collisions in the system.
Answer:
D). The rate increases because a higher temperature means that particles move at higher speeds and there are more collisions in the system.
Explanation:
The rate of the given chemical reaction would rapidly increase with an increase in temperature as the higher temperature will increase the kinetic energy possessed by the reactant molecules. This will lead to the movement of particles at a higher speed and more effective collisions will take place(as the greater proportion of molecules will have the energy required for collision). Thus, the last statement correctly justifies this description and hence, option D is the correct answer.
Determine the net iconic equation for the following chemical reaction: HCl(aq) + NH4OH(aq)———-> NH4Cl(aq) + H2O(I) Hint: HCl(aq) is strong acid NH4OH(aq) is a weak base
Answer : The net ionic equation will be,
[tex]H^{+}(aq)+OH^{-}(aq)\rightarrow H_2O(l)[/tex]
Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The given balanced ionic equation will be,
[tex]HCl(aq)+NH_4OH(aq)\rightarrow NH_4Cl(aq)+H_2O(l)[/tex]
The ionic equation in separated aqueous solution will be,
[tex]H^+(aq)+Cl^-(aq)+NH_4^+(aq)+OH^-(aq)\rightarrow H_2O(l)+NH_4^+(aq)+Cl^-(aq)[/tex]
In this equation, [tex]NH_4^+\text{ and }Cl^-[/tex] are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
[tex]H^{+}(aq)+OH^{-}(aq)\rightarrow H_2O(l)[/tex]
hurry I'm on a timer
Which term describes erosion?
O creates small particles
O hardens rock fragments
O transports solid materials
O dissolves rock components
Answer:
transports solid materials
Explanation:
Erosion is a process where solid materials are transported by natural forces such as wind or water.
Answer: c
Explanation:
in Analytical chemistry laboratory. Nickle(ppm)in water sample estimated by two different students was as ,student 1 (25 24 24 24 24 28 26 ) and student 2 (24 25 24 24 25 25 ), if the true valude on Nickle in water was 20 ppm estimate the precision and accuracy of both students
Answer:
Answers are in the explanation
Explanation:
Precision and accuracy are both statistical concepts. Precision is about how close are the measured values to each other. Accuracy is closeness of the measured values to a specific value or reference value.
There are many ways to calculate precision and accuracy, one is stimating precision as Relative Uncertainty and accuracy as Relative Error.
Formulas are:
Relative Uncertainty: Standard desviation / Measured value.
Relative Error: Measured Value - Expected Value / Expected value
Measured value is the aveage of the values.
For student 1:
Mean = 25
Standard desviation = 1.5275
Relative Uncertainty: 1.5275 / 25
Relative Uncertainty: 0.061
Relative Error: 25 - 20 / 20
Relative Error: 0.25
For student 2:
Mean = 24.5
Standard desviation = 0.5477
Relative Uncertainty: 0.5477 / 24.5
Relative Uncertainty: 0.02
Relative Error: 24.5 - 20 / 20
Relative Error: 0.225
As the student 2 has a low Relative error and uncertainty, you can say student 2 is more accurate and precise
(PLEASE HELP, LAST QUESTION I NEED! ) Describe to me the purpose of stoichiometry calculations.
Explanation:
Stoichiometry measures these quantitative relationships, and is used to determine the amount of products and reactants that are produced or needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry.
Which of the following describes what happens in a chemical reaction?
O A. Molecules change from one phase to another.
B. Molecules dissolved in solution are separated again.
O c. Chemical bonds are broken, and new ones are formed.
O D. Molecules mix without rearranging atoms.
Answer:
c. Chemical bonds are broken, and new ones are formed.
Explanation:
Hope this helps. :)
In a chemical reaction, chemical bonds are broken, and new ones are formed.
What is a chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Calculate the number of grams of HNO3 which must be added to 31.5 g of H20 to prepare a 0.950 m solution.
Answer:
1.89g of HNO3
Explanation:
Data obtained from the question include:
Mass of water = 31.5 g
Molality of HNO3 = 0.950 m
Mass of HNO3 =.?
Next, we shall determine the number of mole of HNO3 in the solution.
Mass of water = 31.5 g = 31.5/1000 = 0.0315 Kg
Molality of HNO3 = 0.950 m
Number of mole of HNO3 =..?
Molality is simply defined as the mole of solute per unit kilogram of solvent (water) i.e
Molality = mole /kg of water
With the above formula, the mole of HNO3 can be obtained as follow:
Molality = mole /kg of water
0.950 = mole of HNO3 /0.0315
Cross multiply
Mole of HNO3 = 0.950 x 0.0315
Mole of HNO3 = 0.03 mole
Finally, we shall convert 0.03 mole of HNO3 to grams. This is illustrated below:
Molar mass of HNO3 = 1 + 14 + (16x3) = 63g/mol
Mole of HNO3 = 0.03 mole
Mass of HNO3 =..?
Mole = mass /molar mass
0.03 = mass of HNO3 /63
Cross multiply
Mass of HNO3 = 0.03 x 63
Mass of HNO3 = 1.89g
Therefore, 1.89g of HNO3 is needed to prepare the solution.
Anyone know how to answer this?
Answer:
i metal
ii nonmetal
iii metal
iv nonmetal
Explanation:
If you look up what the element of a heater is, you get a picture of some sort of rod. It's the heating element of the heater, and must be some type of metal to conduct electricity and warm up. Fishing rods are made of either fiberglass, graphite, or carbon fibre. These are nonmetals. In order for a lightning rod to conduct electricity and bring the lightning down to the ground, it has to be metal. You wouldn't want a metal oven mitt, as that would burn your hand.
Gold and Platinum are found in free state in nature-Give reason.
Consider the equation below.
Zn + H2SO4 → ZnSO4 + H2
The mole ratio of zinc to zinc sulfate is
Answer:
1:1
Explanation:
There is one mole of zinc (Zn) and one mole of zinc sulfate (ZnSO₄).
The mole ratio is 1:1.
Hope this helps.
Answer:
1:1
Explanation:
Name one way chemicals can help the environment
Energy storage and transport. Chemical energy transport.
Answer:
to clean the water
Explanation:
Which missing item would complete this beta decay reaction?
Answer:
The answer is option A.Hope this helps you
While camping you light a small campfire, initiating the combustion of wood to produce heat and
light. What can you determine about this reaction?
O A. It is exothermic.
B. The bond making energy is more than 600 kJ.
OC. It is endothermic.
D. The bond breaking energy is more than 600 kJ.
Answer:
A. It is exothermic
Explanation:
Combustion is a chemical reaction in which a substance combines with oxygen present in air to produce carbon (iv) oxide and water as well release heat and light energy.Combustion is an exothermic process.
An exothermic reaction releases energy in the form of heat to the surroundings. The energy required to break bonds in the reactants is less than the energy required to form new bonds in the products in an exothermic reaction.
From the given options;
A. It is exothermic is determinable since the reaction is a combustion reaction
B. The bond making energy is more than 600 kJ is not certain because the mass of the wood being burnt is not given. Also, wood is not composed of a specific element that would be taking part in the reaction, rather it is composed of various substances.
C. It is endothermic. is wrong because combustion of wood is exothermic.
D. The bond breaking energy is more than 600 kJ is not certain because the mass of the wood being burnt is not given. Also, wood is not composed of a specific element that would be taking part in the reaction, rather is composed of many substances.
if 140cm3 of methane diffuse into air in 72 sec,how long will it take 210cm3 of sulphur dioxide to diffuse under the same condition ?
Answer:
time for sulphur dioxide to diffuse is 221.05 secs
The time for sulphur dioxide to diffuse is 108 sec.
Which gas diffuses twice quickly as SO2?Sulfur dioxide has a molecular weight of sixty-four and as a result, the square root is 8. since its inversely proportional, on the way to diffuse two times as fast, the rectangular root of the molecular weight should be 4, and subsequently the molecular weight might be 16. So the solution is methane (CH4).
Which gases diffuse the fastest?The charge of diffusion for a gas is inversely proportional to the rectangular root of its molecular mass (Graham's law). The gasoline with the lowest molecular weight will effuse the fastest. The lightest, and consequently fastest, fuel is helium.
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What is an exothermic reaction? Combustion of fuel is an exothermic process. Explain why by providing an example of a fuel. Give 3 examples of readily observable reactions that are considered exothermic. In each example, describe the reactants and the products.
Answer:
An exothermic reaction is a chemical reaction in which energy is given out to the surroundings in the form of heat or light or even sound.
Other explanations are given below.
Explanation:
An exothermic reaction is a chemical reaction in which energy is given out to the surroundings in the form of heat or light or even sound. In exothermic reactions, the energy content of the products are lower than that of the reactants and this excess energy is therefore released as the reaction proceeds towards formation of products.
Combustion of fuel is an exothermic reaction because the process involves the release of energy in the form of heat and light to the surroundings as the reactants (usually a fuel and oxygen) which are at a higher energy state combine to give the products which are at a lower energy state (usually CO₂ and water).
An example of a fuel is the gas propane found in cooking gas. It combines with oxygen found in air to produce the heat that is used to cook our foods.
Other examples of exothermic reactions include
1.Lighting firewood: In this process, wood which is a mixture of gaseous fuels like methane and solid fuel like charcoal combine with oxygen found in air to produce carbon (iv) oxide and water vapor while releasing heating the process.
2. Lighting a match: The head of safety matches are made of potassium chlorate, mixed with sulfur, fillers and glass powder. The side of the box contains red phosphorus, binder and powdered glass. When the match is struck, the friction generates heat which causes a small amount of red phosphorus to be converted to white phosphorus, which then ignites spontaneously in air. The heat produced initiates the decomposition of potassium chlorate to give oxygen and potassium chloride. The sulfur catches fire and ignites the wood which also burns in the air to release carbon (iv) oxide an water.
3. Burning of coal: Coal is solid carbon which combines with oxygen in air when ignited to produce carbon (iv) oxide and water vapor while also releasing heat and light energy.
How are the properties of metals and non-metals different?
Answer:
Explanation:
Properties of metals:
1. They have a lustre ( shine )
2. They have a silvery-grey or golden-yellow colour.
3. They conduct heat and electricity.
4. They are ductile ( can be drawn into wires ) .
5.They are malleable ( can be hammered into thin sheets ).
6. They are sonorous ( make a ringing sound when hit ).
Properties of non-metals:
1. They display a variety of colours.
2. They are poor conductors of heat and electricity.
3. They are not lustrous, ductile or malleable.
Hope it helps
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Calcium (Ca) has an atomic number of 20. It can form an ion by losing 2
electrons. What would its charge be?
A. 18
B. 22
C. 2+
D. 2-
Answer:
2+
Explanation:
Apex lolz
write down the new substance formed when ammonia react with hydrochloric acid
Answer: ammonium chloride
Explanation: The reaction equation among ammonia (NH3) and hydrochloric acid (HCl) is written as follows: NH3+HCl=NH4Cl. Ammonia is a susceptible base that reacts with hydrochloric acid, forming a compound referred to as ammonium chloride.
Based on the law of Conservation of Mass, what happens to the mass of a substance in a chemical change? A: the mass is always conserved B: The mass is either created or destroyed C: the reactant always has more mass D: the product always has more mass
Answer:
A.
Explanation:
The amount of mass always stays the same, matter cannot be created nor destroyed, it can only change forms. Thus, the answer is A.
In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.
I hope this helps..
Hi does anyone know how to do question 4?
Please show working out thanks.
answer:
a)1.274 g b) 0.013 mole
Explanation:
a) Mass of 1 mol of CuSo4. 5H20=
[tex]63 + 32 + (16 \times 4) + (7 \times 1) + (16 \times 5)[/tex]
=246g
no. moles of CuSo4. 5H2O=
[tex] \frac{mass}{mass \: of \: 1mole} [/tex]
so moles
=
[tex] \frac{3.14}{246} [/tex]
0.013 mole
in the equation
1 mole of sulphuric acid reacts to form 1 mole of CuSo4.5H2O
in other words
0.013 mole of sulphuric acid reacts to form 0.013 mole of CuSo4.5H2O
so mass of 1 mole (Mr) H2So4=
[tex](2 \times 1) + 32 + (16 \times 4)[/tex]
98g
mass of sulphuric acid= mole × mass of 1 mole
so mass= 0.013 × 98
1.274 g
b) In the equation
1 mole of sulphuric acid reacts to form 1 mole of copper(ll) oxide
in other words
0.013 mole of sulphuric acid reacts to form 0.013 mole of copper (ll) oxide
so 0.013 mole of copper(ll) oxide is reacted
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Which property of the isotopes must be different?
A) The atomic number
B) The electric charge
C) The element name
D) The mass number
How do you find the amount of electrons for any element?
Answer:
If you know the number of protons and neutrons you have to simply subtract the number of neutrons by number of protons the answer will be number of neutron
Explanation:
Answer:
We can find the amount of electrons through its Atomic number and with the help of electronic configuration
Acid rain is the direct result of acid released by burning fossil fuels.
Please select the best answer from the choices provided
ОТ
OF
Answer:
The answer is TrueHope this helps you