Answer: 70.0 g = .53 mol
Q = 250g (+ 1.02) 4.18
Q = 1065. 9 J / 1000 = 1.0659 kJ
1.0659/ .53 = 2.01 kJ/ mol
Answer: 2.01 kJ/ mol
Explanation:
Heat can be transferred from the hotter water to metal causing the metal to melt.
What is heat transfer?The question is incomplete but I will try to give you a general overview. Now, we know that heat can be transferred from one body to another.
Hence, heat can be transferred from the hotter water to metal causing the metal to melt. When the metal melts, the system will now attain an equilibrium temperature.
Learn more about heat transfer: https://brainly.com/question/9904853
What is one advantage that proteins derived from beans have over proteins derived from red meats
Answer: B. Proteins derived from beans have less saturated fat than proteins derived from red meats.
Do elements in the same group have same principle number?
The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. The elements in each group have the same number of valence electrons. As a result, elements in the same group often display similar properties and reactivity.
Answer:
Yes
Explanation:
The atomic number never changes because the number of protons for na elecment never change and if they do, they trn into a neww element
3. An energy pyramid is shown.
Red-
The energy lost at each level is consumed by organisms in
the top level.
tailed hawks
Mexican free-tailed bats
Energy is transferred from organisms in one level to those
in the level above.
Water boatmen
Energy is transferred down each level of the energy
pyramid
Algae
Which sentence best describes how energy flows through this pyramid?
The organisms at the bottom level provide energy directly
to organisms in all the other levels.
Answer: it’s c
Explanation:
What element is represented in this model if the atomic number is 3?
A.
lithium
B.
carbon
C.
nitrogen
D.
neon
Answer:
The answer is lithium
Answer:
A. Lithium
Explanation:
A plot of the Maxwell distribution of velocities for a number of different gases measured at the same temperature shows that
Answer:
as molecular mass increases, more molecules have speeds close to their average speed.
Explanation:
A plot of the Maxwell distribution of velocities for several different gases measured at the same temperature shows that "as molecular mass increases, more molecules have speeds close to their average speed."
This is evident in the fact that the Maxwell distribution of speeds for a given selection of gas at a given temperature shows certain traits if one of the main variables is changed, such as
1. Mass: The proportion of speeds for a given selection of gas is narrower and the average speed is lower for gas of higher molecular weight.
2. Temperature: The proportion of speeds for a given selection of gas is wider and the average speed is higher as the temperature of a gas increases.
which of the following acts as a catalyst in catalytic converters?
A. Wood
B. Metal
C. Water
D. Gas
Answer: B. Metal
Explanation: The catalyst used in the converter is mostly a precious metal such as platinum, palladium and rhodium Hope This Helped (=^･-･^=)
Which set of elements has physical and chemical properties similar to phosphorus?
Aluminum, silicon, sulfur, & chlorine, , ,
Carbon, selenium, iodine, & radon
Oxygen, germanium, indium & mercury
Nitrogen, arsenic, antimony & bismuth
Nitrogen, arsenic, antimony & bismuth
Explanation:
Phosphorus belongs to the 15th group, that is nitrogen family.
Natures are decided by the number of valence electrons.
In a family, all elements have same outer electronic configuration or you say number of electrons.
General electronic con.: ns²np³
A wooden plank has a mass of 100kg force of 20 n was used to move it what is its acceleration
Answer:
a= 0.2m/s²
Explanation:
Fnet = ma
20 = 100a (divide both sides by 100)
a = 0.2m/s²
A wooden plank has a mass of 100 kg force of 20 Nwllhave the acceleration of 0.2 m/s².
What is Acceleration ?Acceleration is the rate of change of the velocity of an object with respect to time.
Accelerations are vector quantities.
The orientation of an object's acceleration is given by the orientation of the net force acting on that object.
We know,
F= ma ,
where
F is force , M is mass , A is acceleration.For 100kg ,
20 = 100 x A
A = 20/100
A = 0.2 m/s².
Therefore, A wooden plank has a mass of 100 kg force of 20 Nwllhave the acceleration of 0.2 m/s².
leran more about Acceleration here ;
https://brainly.com/question/12550364
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definition of diameter?
Answer:
a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
Explanation:
a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
In Mexico City, what are the two things that are causing most of the pollution? If you answer with an explanation I will give you Brainlist PLEASE HELP ITS DUE IN 30minutes
what does the J.J.Thomson model represent?
Answer:
J.J. Thomsons model represents the structure of an atom.
J.J. Thomson's experiments with cathode-ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged particles.
Where is most of an atom's atomic mass?
Answer:
The nucleus contains the majority of an atom's mass because protons and neutrons are much heavier than electrons, whereas electrons occupy almost all of an atom's volume. The diameter of an atom is on the order of 10−10 m, whereas the diameter of the nucleus is roughly 10−15 m—about 100,000 times smaller.
Explanation:
Answer: Nucleus.
Explanation:
How many moles of O2will be produced from 6.2 moles of water?
Answer:
I hope This will help you....and please mark me as Brilliant
Explanation:
The formula, H2O tels us that there are the same number of moles of Oxygen as there are of water. The (understood )molecular coefficient of H2O is 1. The (understood ) coefficient of O in the formula is also 1. The number of moles of oxygen is the same as the number of moles of water. This is moles of oxygen atoms. If the question wants moles of oxygen gas, O2, then it will be half as many I think that is what they want, so I would answer 3.1 moles of O2.
Calculate the energy of interaction between a lithium ion and a magnesium ion at a distance of 4.55x10^-10 m
How do you study things you cannot see
Answer:
For things that we can not directly observe, we can use indirect observation – which studies the consequences of an action or process. For example, we cannot see the Earth's magnetic field, but we detect it by its effect on a compass.
Which of the following substances is a base?
5 points
a. Vinegar
b. Ammonia
c. Lemon juice
d. Distilled water
Answer:
D
Explanation:
water is used to delude just about anything
4NO + 3O2 + 2H2O = 2.4 moles of NO 2.4 moles of O2 and 2.4 moles of H2O react and 2.0 moles of HNO3 are recovered from the reaction. what is the percent yield of this reaction ?
Answer:
83%
Explanation:
Percent yield is 100 times the ratio between actual yield (2.0moles HNO₃) and theoretical yield. To find theoretical yield:
As you can see in the reaction:
4NO + 3O₂ + 2H₂O → 4HNO₃
4 moles of NO are required when 3 moles of O₂ and 2 moles of H₂O reacts. As equal moles of each reactant are added, the limiting reactant is NO because is the substance that requires more moles to react.
2.4 mol NO produce 2.4 mol HNO₃-Because 4 moles of NO produce 4 moles of HNO₃. That means theoretical yield is 2.4 moles and percent yield is:
2.0 moles / 2.4 moles * 100 = 83%
Instructions:
Balance chemical equations on bach side by multiplying the molecular or ionic compounds by a
coefficient.
_C3_H8
+
O2
CO2
H2O
Answer: the answer is b
Explanation:
Answer:
Explanation:
B answer
HELP THIS IS FOR CHEM!! If the pull force is 898N and the friction force is 335N what is the net force?
Answer:
Explanation:
Help me out please an thank you
Rust forming on a piece of iron is an example of which of the following? *
1The natural process of decay as metallic ions age
2 A physical change because the process can be reversed
3 A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms
4 A violation of the laws of physics because new mass has been created
What is the chemical equation of a covalent bond
Answer:
In my knowledge of chemistry, I believe there isn't chemical equation for covalent bond. There is only covalent formula
Explanation:
if a:b =2:3and b:c=6:10,find a:c.
Answer:
4:10
Explanation:
a:b
2:3
6:10
b:c
The common ratio is b
The lcm of 3 and 6 is 6.
Multiply the first ratio by 2 and the second one by 1
a:b:c
4:6:10
hence a:c = 4:10
What is the new volume if a piston starts at 25ml and 900 mm Hg and the pressure decreases to 750 mm Hg?
What is the starting pressure if an inner tube starts at 40L and then the volume decreases to 30L after the pressure is increased to 20 psi
What is the starting temperature if a balloon increases from 50ml to 70ml and the final temperature was 350K?
If a bubble cools from 300K to 200K and the final volume is 18ml, what volume did it start at?
Answer:
I screenshot and expained here
https://screenshot.best/A7QIKV.lnk
Explanation:
Calculate the following:)
Answer:
I think it's 1.55 x 10^40
Explanation:
i hope dis helps<3
Help plsssssss... 3C(s) + 2Fe2O3 (5) ► Fe
(s)
+ 3CO2 (g)
What type of chemical reactions is the chemical reaction described above?
Answer:
single displacement
Explanation:
the Fe was switched out with the C. they are the only ones that switched, making it a single displacement
Answer:
Single displacement.
Explanation:
This is because Iron (Fe) was "switched" with C and this being the only "switch" in the equation makes it a single displacement.
If using a microscope allows you to see substances in a mixture, that mixture is _____
Answer:
That means that mixture is HeteroGeneous.
Explanation:
Hope this Helps!
Darwin proposed the “theory of evolution by natural selection” in which he stated that certain members of species have adaptations to help them _____ while other members who don’t have the helpful adaptation die out.
PLS HELP ME! WHAT DOES IN THE MISSING BOX??!
ILL GIVE U 5 STARS JUST HELPPP
Answer:
survive
.............
Which is the correct molar mass for the
compound aluminum carbonate, Al2(CO3)3?
Answer:
molar mass for the
compound aluminum carbonate, Al2(CO3)3
233.99 g/mol
How many kinds of horses are there in the world? Give me a real number, plz its for a magazine article!
Answer:
784
Explanation:
Answer:
784 horse breeds