Answers
Answer:
A
Explanation:
Related Questions
A teacher demonstrates a chemical reaction. A student
observes that the test tube in which the reaction occurs
becomes warm. What is the source of the thermal
energy generated by the reaction?
Select one:
A. potential energy absorbed by the reaction
B. breaking bonds of the reactants
C. kinetic energy absorbed by the reaction
D. energy stored in the reactants
Answers
Answer: B, breaking bonds of the reactant.
Explanation:
This reaction is taking in energy and we know this because it says it 'becomes warm'.
Endothermic reactions take in heat/energy from the surroundings and bond breaking occurs during an endothermic reaction.
B. breaking bonds of the reactants which emits heat energy.
The test tube in which the reaction occur is warm because the heat energy is released due to the making of new bonds. When the new bonds are formed, energy is released in the form of heat.
Energy is needed to break bonds so it absorbed the bonds so we can say that bond-breaking is an endothermic process while on the other hand, energy is released when new bonds form so we can say that bond-making is an exothermic process.
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Heat from the sun moves through space by the process of
es
A)
circulation.
B)
conduction
C)
convection.
D)
radiation
Answers
I gave brainlest:: answer this .....
Answers
Mercury is a liquid at room temperature, gallium will melt if held in your hand, and aluminum is a solid that has a high melting point. All three are metals. How can you explain these observations using information about the strength of metallic bonds?
Answers
Answer:
the solid is so hard
Explanation:
yan na po sana makatulong po heheheh
Metals such as Gallium and mercury are different from that of other metals like aluminium because they are liquid at room temperature. This is because of valence electrons which are relatively free in these metals.
What are Metals?
All the metals except mercury and gallium are solids at room temperature. These metals are liquids because of both the high electrical conductivity and the thermal conductivity which come from the fact that one or more valence electrons is relatively free in these atoms to travel throughout the solid metal. This has been formalized in the Wiedemann-Franz law.
Both Gallium and mercury are unique elements (metals) which occur in the liquid state at near the room temperature. It is important here to note that mercury is essentially a liquid at room temperature while gallium becomes liquid at temperature near to room temperature. They both melt very easily due to the low melting temperature values.
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How many liters of solution would it take to make a 0.250 M solution when you have 3.52 moles of solute?
Answers
Answer:
The volume of solution in liters required to make a 0.250 M solution from 3.52 moles of solute is 14.08 liters of solution
Explanation:
The question relates to the definition of the concentration of a solution which is the number of moles per liter (1 liter = 1 dm³) of solution
Therefore we have;
The concentration of the intended solution = 0.250 M
Therefore, the number of moles per liter of the required resolution = 0.250 moles
Therefore, the concentration of the required solution = 0.250 moles/liter
The volume in liters of the required solution that will have 3.52 moles of the solute is given as follows;
The required volume of solution = The number of moles of the solute/(The concentration of the solution)
∴ The required volume of solution = 3.52 moles/(0.250 moles/liter) = 14.08 liters
The required volume of solution to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.
Therefore the number of liters required to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.
What percent of FeSO4 is Fe
Answers
Answer:
About 36%
Explanation:
why ammonia is a identified as a weak base?
can you explain what it is meant by it only ionise partially?
Answers
Answer:
Ammonia doesn't contain any hydroxide ions to begin, but it's dissolved in water acquires hydrogen ion from the water to produce hydroxide as well as ammonium ions. However ammonia doesn't fully convert into hydroxide and ammonium ions in solution that's why ammonia is a weak base.
___MgCl2(s) +___ MiCO3(s)
Answers
Answer:
MgCl2 (s) + Li2CO3 (s) ==> MgCO3 (s) + 2LiCl (aq)
Double Replacement
Explanation:
MgCl2 (s) + Li2CO3 (s) ==> MgCO3 (s) + 2LiCl (aq)
Double Replacement
Halogens are Soluble
Carbonates are Insoluble
This reaction DOES take place.
help pleaseee
find the molecular formula of a compound with a molar mass of 70.0 g/mol and an empirical formula of CH2.
Answers
Answer:
In order to find the molecular formula from an empirical formula you must find the ratio of their molecular masses.
We know that the molecular mass of the molecule is 70
gmol-1
. We can calculate the molar mass of
CH2
from the periodic table:
C=12.01
gmol−1
H=1.01
gmol−1
CH2 =14.03
gmol−1
Hence we can find the ratio:
14.03
70
≈
0.2
what trend does the first ionization energy follow, going down the periodic table?
Answers
Answer:
going down the periodic table atomic size increases,electronegativity and ionization decreases going down
How many liters are in 100g of CoCl2?
Answers
Answer:
0.77018342688495
Explanation:
I did this
Plzzzzz helpppp meee
Answers
Answer:
2 and 5
Explanation:
When making a cup of ramen with boiled water, which of the
following example is conduction?
a Stirring the soup to make it cooler
b Smelling the soup outside the kitchen
C Feeling heat from holding the cup
d The powdery soup dissolving in water
e The soup releasing hot steam
Answers
Answer:
C. Feeling the heat from holding the cup
Explanation:
Conduction is the process by which heat or electricity is directly transmitted through a substance to another substance that has different levels of heat or electricity.
Therefore, the only logical answer is C. Feeling heat from holding the cup.
This is because the heat from the cup is being directly transmitted to the hand of the person.
Hope this helps!!
- Kay :)
Could someone please help me? You can ignore number 3:)
Answers
Answer:
Question 2: Because the elements could be unstable, forming elemental compounds.
Question 1: Water is made up of Hydrogen and oxygen, which is namely called H2^o What makes it a pure substance is the little mass and molecules it's made up of.
what are the elements of the liquids in the periodic table?
Answers
Answer:
bromine,mercury ,caesium,gallium,rubidium and francium
Explanation:
Answer:
Mercury
Bromine
Caesium
Rubidium
Francium
Gallium
These all are liquid elements
Explain how steam causes burns by describing the transfer of heat.
Answers
Answer:
It will be : (in simple terms)
Condensation of hot steam or hot vapor on the cooler skin releases the water's latent heat of vaporization, rapidly raising the temperature of the skin which will result in steam burns.
Hope it helped
All the best!!
which of the following choices are the characteristics of life
Answers
2) Which liberates the most energy?
A) F(g) + e ➡️ F-(g)
B) N(g) +e- ➡️ N-(g)
C) O(g) +e ➡️ O-(g)
D) C(g) +e ➡️ C-(g)
Answers
Answer: [tex]F(g)+e^-\rightarrow F^-(g)[/tex]
Explanation:
Electron gain enthalpy is defined as energy released on addition of electron to an isolated gaseous atom.
The amount of energy released will be maximum when the tendency to attract electrons is maximum. As flourine has atomic number of 9 and has electronic configuration of 2,7. It can readily gain 1 electron to attain stable noble gas configuration and hence liberates maximum energy.
[tex]F(g)+e^-\rightarrow F^-(g)[/tex]
How cold is it on Uranus
Answers
Answer:
-371 degrees f
Explanation:
-371 degrees F.
speeds on Uranus range from 90 to 360 mph and the planet's average temperature is a frigid -353 degrees F. The coldest temperature found in Uranus' lower atmosphere so far is -371 degrees F., which rivals Neptune's frigid temperatures.
(hope this helps can i plz have brainlist :D hehe)
Rock whose texture, mineralogy, or chemical
composition has been altered without melting it.
Answers
Answer:
I believe it would be C or B
Lunar phases include the waxing and waning phases. The waxing phases have light on the _______ side of the moon as we look at it from Earth *
A. Top
B. Left
C. Right
D. Bottom
Answers
Answer:
Explanation:
The light is on the right side of the moon from Earth's perspective. The light will never be on the bottom or top. Its either waxing or waning; left or right
State the numbers of protons, neutrons & electrons in an atom of Carbon-14
Answers
Answer:
Neutral carbon-14 contains six protons, eight neutrons, and six electrons; its mass number is 14 (six protons plus eight neutrons). These two alternate forms of carbon are isotopes.
I hope it's helpful!
These are incorrect please put the right answer on the blanks\
for brainiest:)
Answers
Answer:
1. condensation
2. Temperature
3. evaporization
4. kinetic energy
5. sub limation
6. thermal energy
7. deposition
8. vaporization
Growing salt crystals from evaporated sea water is an example of a chemical reaction.
True
False
Answers
Answer:
false
Explanation:
This is not a chemical reaction.
what number repersents the subscript 5H2
Answers
if 3 mol of fe2o3 reacts with 5 mol al what is the maximum amount of fe that was produced. Explanation please!
Answers
Answer:
Queso es yummy. If you give me below 5 stars u like sucking on rocks.
Explanation:
Why does the periodic table have the shape it has
Answers
Answer: The arrangement of electrons in atoms is responsible for the shape of the periodic table.
Explanation: Electron configurations can be predicted by the position of an atom on the periodic table.
O_O O_O O_O
Add me as a freind!!! <3
The periodic table has the shape it has because the elements are arranged according to their atomic number, which is the number of protons in the nucleus of an atom.
The chemical elements are arranged in a periodic table in ascending order of atomic number, allowing one to observe trends in the elements' properties.
Here are some of the reasons why the periodic table has the shape it has:
The number of protons in the nucleus of an atom determines its chemical properties. Elements with similar numbers of protons have similar chemical properties, so they are grouped together in the periodic table.The number of electron shells in an atom determines its size and its reactivity. Elements with the same number of electron shells have similar sizes and reactivities, so they are grouped together in the periodic table.The number of valence electrons in an atom determines its chemical bonding. Elements with the same number of valence electrons have similar chemical bonding properties, so they are grouped together in the periodic table.The periodic table is a valuable tool for understanding the chemical properties of the elements.
Therefore, above mentioned are some of the reasons why periodic table has the shape it has.
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Al+hcl=alcl3+H balance
Answers
Answer:
Explanation:
Kindly answer the way I have written.
A 100.-gram sample of H2O(l) at 22.0°C absorbs 830. joules of heat. What will be the final temperature of the water?
Answers
Answer:23.976
Explanation:830j = 197.6 cal. 197.6/100g=1.976 degrees. plus 22 degrees =23.976
1)How does the cut on your finger heal ? (1 mark )
2)Why is Rayon different from synthetic fibres? ( 1 mark )
3)What are synthetic fibres called? (1 mark )
4)Give examples which indicate that nylon fibres are very strong. (1 mark )
5) Explain why plastic containers are favoured for storing food . (3 marks )
6) Explain the difference between thermoplastic and thermosetting plastics. ( 3 marks)
Answers
Answer:
3) Some fibres are called synthetic because they are not made from natural fibres. Instead, they are made by chemical processing of petrochemicals. The synthetic fibres are made up of very large units called polymers. Some of the synthetic fibres are - nylon, rayon, acrylon
4) is used for making parachutes, rock climbing ropes, fishing nets, seat belts. A nylon thread is actually stronger than steel wire.
5) for the following reasons:
1. Plastic containers do not react with food
2. Plastic containers are light weight so they are easy to handle.
3. The price of plastic containers is very less as compared to other containers.
4. They have strong strength.
5.. Plastic containers are durable
6) (thermosetting plastic) have primary bonds between molecular chains and held together by strong cross-links
(Thermoplastics) have secondary bonds between molecular chains