Answer:
See below.
Explanation:
The children feel cold on touching the ice block as the temperature of it is much less than body temperature.
How many copper atoms are in a pure copper statue with a mass of 198 kg?
Answer:
No.of copper atoms= no.of moles x No x atomicity
(No - avagardro's number )
= wt / atomic mass x No x 1
= 198 x 10 ^3 g / 63.5 x No
= 3.118 x 10^3 x 6.02 x 10^23
= 18.77 x 10^26 atoms.
6. 0.465 mole sample of gas exerts 4.43 atm of pressure in a 2.25 L container. What is the temperature of the gas in the container?
Answer:
T = 262KExplanation:
n = 0.465
P = 4.43 atm
V = 2.25 L
T = ?
Follow this equation below
PV = nRT4.43 x 2.25 = 0.465 x 0.08206 x T
9.97 = 0.038 x T
(Dividing both sides by 0.038 to get rid of it)
T = 262K or you could say 262.4K
Hope this helps!!
Which of the following is a possible pH for distilled water that has lime (a base) dissolved in it?
a. 1
b. 3
c. 7
d. 9
Answer:
Explanation:
Distilled water has a pH of 7. Anything below that is acidic. One is very acidic. So a b and c cannot be the answer.
Lime is a base. That means that when it is put in water, the pH is going to be greater than 7,
The only possible answer is D
Eutrophication causes loss of Biodiversity”. Substantiate the statement
Eutrophication causes loss of biodiversity because many species need light to survive. It affects light penetration in the water body.
What is eutrophication?Eutrophication is a phenomenon where an aquatic environment (e.g., a lake) is enriched with minerals and nutrients.
The most common nutrients associated with eutrophication are nitrogen and phosphorus.
Eutrophication can severely affect light penetration in the water body, thereby affecting the survival of producer organisms (plants) and causing a loss of biodiversity across all trophic levels.
Learn more about Eutrophication here:
https://brainly.com/question/8499582
1
This question is about the Earth and its atmosphere.
Figure 1 shows the Earth and its atmosphere billions of years ago.
The boiling point of water is 100°C.
Suggest one reason why there was no liquid water on the Earth's surface billions of
years ago.
Earth's early
atmosphere of:
• carbon dioxide
• water vapour
• methane
• ammonia
Answer:
water vapour
Explanation:
allow the Earth’s surface
temperature was too/very hot
or water evaporated/ boiled
or turned to steam/gas
allow because of heat from
volcanoes
ignore the Earth’s surface
was covered by volcanoes
ignore water turned to water
vapour
Which of these statements accurately describes polymers?
Polymers are macromolecules.
Polymers are simple molecules.
Polymers are made of metal atoms.
Polymers contain double bonds.
Answer:
Its A.) Polymers are macromolecules
Explanation:
Answer:
The correct answer that you are looking for is A.) Polymers are macromolecules.
Read this excerpt from the play An Adventure for Detective Dennis:
Stars twinkle in the windows of the library.
What element of a play is shown in this text?
Cast of characters
Dialogue
Scene
Setting description
Answer:
the answer is Scene
Explanation:
because it is describing the atmosphere of where the book/play is taking place
Answer:
the answer is Scene
Explanation:
which of the following provides the best analogy for an electron in an atomic orbital
Answer:
a
Explanation:
the answer is a i'm pretty sure it might be wrong tho i'm sorry
FIFTEEN POINTS HELP!!!!! The gravitational strength on Earth is less than the gravitational strength on Jupiter. What will happen to a satellite when it travels from Earth to Jupiter?
Its mass will increase.
Its mass will decrease.
Its weight will increase.
Its weight will decrease.
Answer:
I think it is c.
Explanation:
the weight will increase
because Jupiter has a greater gravitational strength then earth, and the mass does not change wherever you go. So the only awnser that makes sense is c, Its weight will increase.
Please tell me if I'm right or wrong, thanks :)
80+80
help
pelase
80+2-0
Answer:
the first one would be 160 and the second 82 :)
Explanation:
Answer:
160 and 82?
Explanation:
80 plus itself is 160 and 80 plus 2 is 82 minus 0 is 82.
4. A student heats copper metal over a flame, and it begins to react with oxygen gas (diatomic
molecule 02) in the air. A green flame is seen. Copper (11) Oxide is formed.
Word
Explanation:
Since Oxygen and Copper combine to form Copper Oxide. Therefore, this is a combination reaction
Hope this helps
What is the specific heat of titanium if the temperature of a 36.7 g sample of titanium is increases by
4.8 °C when 91.6 J of heat is added?
Answer:
what is the initial temperature? i can answer once I know. if it doesnt say, then I dont know and I'll delete this
Imagine a campfire on a cold day. At first, the temperature of each log is as cold as the air around it. A few hours after the fire has burned out, the temperature of the ashes will also be cold. But in between, when the fire is burning, the temperature of the logs and surrounding air is very hot. What is the source of this thermal energy? For the answer, begin by identifying the reactants and products for the overall chemical reaction of burning wood. Wood is mostly carbohydrates, the bulk of which is cellulose. Cellulose is made up of hundreds to thousands of glucose groups connectected by oxygen molecules. The chemical formula for cellulose is (C6H12O6)n, where n is the number of glucose groups. For more manageable models, carbohydrates will be modelled as glucose with a chemical formula of C6H12O6.
Answer:
See explanation
Explanation:
According to the first law of thermodynamics, energy can neither be created nor destroyed, but can be transformed from one form to another.
The thermal energy observed in the hot air while the fire rages is obtained from the chemical energy stored in carbohydrates(cellulose) that compose the wood material. As the wood is burnt, this chemical energy stored in chemical bonds of the wood material is converted to heat. The chemical reaction in the combustion of wood can be simply modeled as the combustion of n moles of glucose.
nC6H12O6(s) + 6nO2(g) ===> 6nCO2(g) + 6nH2O(g)
Note that n may even be thousands of glucose molecules that combine to form cellulose present in wood.
Arrange the missing steps in the correct order.
Answer:
There's nothing to arrange l
Does respiration release or absorb energy?
Answer:
it releases energy
Explanation:
Answer:
It releases energy
Explanation:
The reactions involved in respiration are catabolic reactions, which break large molecules into smaller ones, releasing energy because weak high-energy bonds, in particular in molecular oxygen, are replaced by stronger bonds in the products.
A student dissolves 73 g of sodium nitrate, NaNO3, in 100 mL of water and observes a clear, colorless
solution. The student begins to add more sodium nitrate to the solution and it instantly becomes a cloudy,
heterogeneous mixture. The original solution the student prepared is best described as
unsaturated
saturated
immiscible.
supersaturated
How many moles of molecular oxygen will be needed for
the complete combustion of 100.0 g of sulfur dioxide? The product of this reaction
is sulfur trioxide.
A. 0.7804 moles
B. 1.561 moles
C. 0.641 moles
D. 1.281 moles
Answer:
The answer is A. 0.7804 moles
Electromagnetic radiation emitted from a hot object reaches it's peak at a wavelength of 8.5 x 10-7 m. What is the frequency of this radiation
Answer:
the frequency is 18
Explanation:
please mark me as the branlest hope it helps please
Describe the changes in membrane permeability that occur at the point of stimulation on the axon.
Answer:
The permeability of a membrane is affected by temperature, the types of solutes present and the level of cell hydration. Increasing temperature makes the membrane more unstable and very fluid.
Explanation:
Can someone tell me this? I’m rlly lost i -
Answer:
A Golgi Body
B Vacuole
C Mitocondrian
D Nucleus
E Cell membrane
Explanation:
What is carbon sink and how it effects our environment?
Answer:
Explanation:
Carbon sink is basically anything that absorbs carbon from the atmosphere. Particularly, the soil, trees, plants and the ocean absorb the most carbon, which helps with greenhouse emission.
whats the biggest thing in the whole universe
Answer:
The biggest thing in the universe is a supercluster known in the universe is the Hercules-Corona Borealis Great Wall.
Explanation:
Which of the following properties of pure solvents increase when a solute is added?
a. Freezing point
b. Vapor pressure
c. Boiling point
d. Cohesion
hello people ~
Which of the following groups contain only synthetic fibres?
A. Nylon, Terylene, Wool
B. Cotton, Polycot, Rayon
C. PVC, Polythene, Bakelite
D. Acrylic, Silk, Wool
Answer:
PVC,polythene,Bakelite
Explanation:
PVC stands for polyvinyl chloride used in pipes Polythene used as bags.Bakelite used in switchesChoose the correct products for the double replacement reaction below. Click here to access the solubility rules to determine which product, if any, forms a solid precipitate in the reaction. AgNO3 KCl Upper K l Upper Pb (Upper N Upper O Subscript 3) Subscript 2 Baseline right arrow. ? K O2 NCl KNO3 AgCl AgK ClNO3 K2NO3 AgCl2.
In both cases, the precipitates were AgCl and PbI2 respectively.
What is a precipitate?A precipitate is a solid product obtained from the reaction of two aqueous phase species. Let us now consider the two reactions listed in the question;
AgNO3(aq) + KCl(aq) ----> AgCl(s) + KNO3(aq)2KI(aq) + Pb(NO3)2 (aq) ----->PbI2(s) + 2KNO3(aq)We can see that in both cases, the precipitates were AgCl and PbI2 respectively.
Learn more about precipitates: https://brainly.com/question/24846690
Answer:
B and B
Explanation:
edge 2022
Pearls are made of calcium carbonate and can be broken down ( or dissolved ) by Hcl according to the following balanced equation :
CaCo3 + 2 HCl -> CaCl2 + H2O + CO2
What volume of 0.400 M HCl would be needed to dissolve a CaCO3 pearl which weighs 0.400 grams?
[tex]\boxed{\sf Molarity=\dfrac{Moles}{Vol\:in\:L}}[/tex]
Moles of CaCO_3:-
0.4/100=0.004mol1 mol Calcium carbonate need 2 mol HCl0.004 mol will need 0.004(2)=0.008mol HClCome to formula stated first
[tex]\\ \tt\Rrightarrow Volume=\dfrac{Moles}{Molarity}[/tex]
[tex]\\ \tt\Rrightarrow volume=\dfrac{0.008}{0.4}[/tex]
[tex]\\ \tt\Rrightarrow volume=0.02\ell=20m\ell[/tex]
A 1 kg object accelerates at a rate of 5 m/s2.
Answer:
5 N.
Explanation:
We can calculate the net force on the object by using Newton's second law of motion:
F is the net force on an object
m is the mass of the object
a is its acceleration
For the object in this problem, we have
m = 1 kg is its mass
is its acceleration
Substituting into the equation, we find the net force:
How much energy is required when a 142.1 gram sample of aluminum goes from 25.5°C to 46°C? (the specific heat of aluminum is 0.90 J/g °C).
Answer:
2621.75 j heat is required to increase the temperature 25.5°C to 46°C.
Explanation:
Given data:
Mass of sample = 142.1 g
Initial temperature = 25.5°C
Final temperature = 46°C
Specific heat capacity of Al = 0.90 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 46°C - 25.5°C
ΔT = 20.5°C
Q = 142.1 × 0.90 J/g.°C × 20.5°C
Q = 2621.75 j
Thus, 2621.75 j heat is required to increase the temperature 25.5°C to 46°C.
reaction of ethene with H2
Answer:
The hydrogenation of ethene
Ethene reacts with hydrogen in the presence of a finely divided nickel catalyst at a temperature of about 150°C. Ethane is produced. This is a fairly pointless reaction because ethene is a far more useful compound than ethane!
Explanation:
4) What type of reaction is the following?
exothermic
endothermic
not enough information given
Answer:
Endothermic
Explanation:
Notice that heat is written as part of the reactants. Therefore, heat is necessary for the reaction to proceed.
In other words, the reaction is endothermic.
Conversely, if the heat is written as part of the products, heat is released as the reaction proceeds and hence the reaction is exothermic.