Approximately how many joules of heat energy are released when 50 grams of water are cooled from 70°C to 60°C?
Answer:
Q = -2090 J
Explanation:
Given that,
Mass, m = 50 g
Water is cooled from 70°C to 60°C.
We need to find how many heat energy are released. Heat released is given by :
[tex]Q=mc\Delta T[/tex]
c is the specific heat of water, [tex]c=4.18\ J/g-C[/tex]
Putting all the values,
[tex]Q=50\times 4.18\times (60-70)\\\\Q=-2090\ J[/tex]
So, the heat energy released is 2090 J and negative sign shows heat is released.
Answer:
it is 2,100J
Explanation:
Alexandra is preforming this combustion reaction i lab: C3H8 + 5O2 + 3CO + 4h20. If she carefully measures out 220 g of C3H8 and discovers she has produced 660 g of carbon dioxide and 360 g of water, how many grams of oxygen must have been required to react with the C3H8?
Answer:
800 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
C3H8 + 5O2 —> 3CO2 + 4H2O
Next, we shall determine the masses of C3H8 and O2 that reacted from the balanced equation. This is illustrated below:
Molar mass of C3H8 = (12×3) + (8×1)
= 36 + 8
= 44 g/mol
Mass of C3H8 from the balanced equation = 1 × 44 = 44 g
Molar mass of O2 = 16 × 2 = 32 g/mol
Mass of O2 from the balanced equation = 5 × 32 = 160 g
From the balanced equation above,
44 g of C3H8 reacted with 160 g of O2.
Finally, we shall determine the mass of O2 needed to react with 220 g of C3H8. This can be obtained as follow:
From the balanced equation above,
44 g of C3H8 reacted with 160 g of O2.
Therefore, 220 g of C3H8 will react with = (220 × 160)/44 = 800 g of O2.
Thus, 800 g of O2 is needed for the reaction.
PLZ ANSWER WILL GIVE BRAINLIEST ASAP
Given the data below, what substance does not show a reaction for any of the tests? Hint: (+)= reaction occurred, (-)= no reaction
unknown
salt
Corn starch
Gelatin
Answer:
Salt
Explanation:
It has all -
the density of titanium metal is 4.51 g/cm at 25°C. what mass of titanium displaces 125.0mL of water at 25°C?
Answer:
The answer is 563.75 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 125 mL = 125 cm³
density = 4.51 g/cm³
We have
mass = 125 × 4.51
We have the final answer as
563.75 gHope this helps you
What is the mass (g) of 6.50 moles of water (H2O)? While using moleconversion
Answer:
Mass = 117 g
Explanation:
Given data:
Moles of water = 6.50 mol
Mass in gram = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of water = 18 g/mol
Now we will put the values in formula.
6.50 mol = mass/ 18 g/mol
Mass = 6.50 mol×18 g/mol
Mass = 117 g
Please answer quick
2. Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g ofSubstance A to the first beaker, and 50 g of Substance B to the second beaker. After stirring both beakers, there is a small pile Substance A at the bottom of the first
beaker. None of Substance B is visible in the second beaker. Which of the following statements is true?
A. Substance A is less soluble in water than Substance B.
B. Substance A is more soluble in water than Substance B.
C. Substance A is not soluble in water,
D. Substance B is not soluble in water,
Answer:
A. Substance A is less soluble in water than Substance B.
Explanation:
Solubility: The term "solubility" is described as a specific property determining the capability of a particular solute, substance to get dissolve in a "solvent". Thus, solubility is being measured with respect to the "maximum amount" of a specific solute that is dissolved or mixed in a solvent at "equilibrium". After the given process, the resultant solution is referred to as a saturated solution.
In the question above, the correct answer is option-A.
Lewis diagrams of molecules of three different hydrocarbons are shown above. Which of the following claims about the molecules is best supported by the diagrams?
Answer:
D
Explanation:
Seeing the Lewis formula for each of the molecules, we can attempt to write the condensed structural formula for each.
What we notice is that while there are purely single bonds between the carbon atoms in the first molecule, there is a double bond in the second molecule and a triple bond in the third
What we can deduce from this is that these are alkanes , alkenes and alkynes
The alkynes have the strongest of the three bonds and thus they have the strongest bonds in the mix
Since molecule 3 is an alkyne, then we can say that it has the strongest of the bonds
The correct claim about the molecules that best supports the diagrams is :
( D ) The strongest carbon to carbon bond occurs in molecule 3
The first molecule ( molecule 1 ) is an alkane because the molecule is made up of only single bonds connecting the carbon atoms.
while the second mole ( molecule 2 ) is an alkene because of the presence of a double bond connecting carbon atoms.
and the third molecule ( molecule 3 ) is an alkyne because of the presence of a triple bond connecting carbon atoms.
Therefore Alkynes have the strongest of of bonds between its carbon atoms because of the presence of a triple connecting carbon atoms.
Hence we can conclude that The strongest carbon to carbon bond occurs in molecule 3
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which element would most likely be a shiny solid at room temperature and a good conductor of electricity?
a. Co
b. I
c. F
d. Cl
Answer:
A
Explanation:
rest are nonmetals and they are not shiny
TRUE OR FALSE!!
All solids have a closely packed, fixed arrangement of particles.
A. True
B. False
this is a test, help!!
Answer:
false
Explanation:
jk true
List and describe six forms of energy.
Answer:
Gravitational energy, electric energy, magnetic energy, nuclear energy, thermal energy, chemical energy.
Explanation:
gravitational energy - the energy resulting from the attraction of two masses to each other
electric energy - energy from a static or moving electrical charge.
magnetic energy - energy from the attraction of opposite magnetic fields, repulsion of like fields, or from an associated electric field
nuclear energy - energy from the strong force that bonds protons and neutrons in an atomic nucleus
thermal energy - also called heat, this is energy that can be measured as temperature. It reflects the kinetic energy of atoms and molecules
chemical energy - energy contained in chemical bonds between atoms and molecule
mechanical energy - the sum of the kinetic and potential energy
radiant energy - energy from electromagnetic radiation, including visible light and x-rays (for example)
I WILL MARK BRAINLIST TO WHOEVER SHOWS FULL STEPS PLEASE LOOK AT THE IMAGE ABOVE
Answer:
+47°C
Explanation:
ΔT means change in temperature. If the change is positive, it means that heat was added and the temperature went up.
ΔT = final temp - initial temp
ΔT = 86°C -39°C = + 47°C
A brief explanation to this question: "Why are neon signs/fireworks different colors? Please help me. Do not look up internet
Answer:
when lit, the atoms of different chemical compounds inside the firework absorb energy, when the electrons fall back to lower energy levels, they give off colored light. Depending upon the chemical used, different colors are produced. neon lights or signs are glass tubes filled with neon gas. When the light is plugged in, the electrical energy causes the electrons of neon to jump to higher energy levels, when they go to lower levels, colored light is given off. The neat thing is that the neon never gets used up. The only thing that gets used up is the electricity. The electrons don't get destroyed and can be used over and over again jumping levels. Neon glows with an orange light, but you know that neon signs can be lots of different colors. The variations come when different gases other than neon are used such as argon, or krypton or when the tube is painted so that with the light produced it produces a certain color.
Explanation:
After being excited by high levels of electrical energy (as in neon signs) or heat energy, various elements and molecules will emit their own specific colors of light.
What are basis behind fireworks?Metals burn in a variety of colors. When a copper compound is lit, for example, the flame is blue-green.
Calcium burns red, while potassium burns purple. Metals are combined to produce various colors in fireworks.
The appearance of each firework is determined by the type of stars it contains, as well as the size and quantity of these pellets.
Some stars contain metal salts, which produce brilliant colors, while others contain a variety of chemical compounds that produce dazzling light effects such as strobing, sparkling, and others.
Various elements and molecules will emit their own specific colors of light after being excited by high levels of electrical energy (as in neon signs) or heat energy (as in the fireworks).
Thus, the neon signs or fireworks provide different colors.
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A compound has an empirical formula of CH2 and a molar mass of 56 g. What is its molecular formula?
O C5H10
O C4H8
O C3H6
O C2H4
Answer:
C4H8
Explanation:
First find the molar mass of CH2;
2(1.01) + 1(12.01) = 14.03g
Now divide the molar mass of the compound by the molar mass of CH2;
56g/14.03g = 3.9914 Round to nearest whole number = 4
Multiply CH2 by 4 to get the molecular formula;
CH2* 4 = C4H8
Answer:
C4H8
Explanation:
calculate the amount of grams each formula turns out to be
C5 = 60.05g well C5 is already larger than 56g so its not A
C4= 48.04g and H8= 8.08g, 48.04 + 8.08 = 56.12 so this is really close to our answer
C3 = 36.03g and H6= 6.06g, 36.03 + 6.06 = 42.09
C2 = 24.02g and H4 = 4.04g, 24.02 + 4.04 = 28.06
so the answer would be C4H8
Which of the following suggests a chemical change took place? *
A.The substance is smaller than it was before the change took place.
B.A new substance has formed.
C.The substance looks the same as it did before the change took place.
D.The substance has been shaken up.
Answer:
A
Explanation:
Because it got smaller so that mean it had a chemical reaction
Which best explains how photosynthesis is helpful to humans? OIt reduces the amount of harmful rays released by the sun. O It increases the levels of carbon dioxide in the air. O It provides oxygen for humans to breathe. OIt produces proteins, which humans can eat.
Answer:
C. sorry i am late :)
Explanation:
During photosynthesis, plants intake carbon dioxide from the air and releases oxygen. Thus, they are providing enough oxygen available for humans to breath.
What is photosynthesis?Photosynthesis is a bio-chemical process by which green plants produces chemical energy with the aid of light energy absorbed by chlorophyll. Photosynthetic reaction is the combination of carbon dioxide and water giving molecular oxygen and glucose.
Through photosynthesis, the amount ox oxygen and carbon dioxide in the atmosphere is balanced. This balancing cycle involves respiration of animals also.
The carbon dioxide that we exhale are up taken by plants and converts to oxygen gas. This makes sufficient oxygen for all animals to breath. Therefore, photosynthesis is a stage in carbon cycle and oxygen cycle.
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Do you think MgO has a higher or lower
melting point than NaCl? Why?
Answer:
Magnesium Oxide (MgO) has a higher melting point than Sodium Chloride (NaCl) which is around 2,800 degrees Celcius. This is because its Mg2+ and O2- ions have a greater number of charges, and so form stronger ionic bonds, than the Na+ and Cl– ions in Sodium Chloride.
Mr. Knowlton loves to throw a football around for fun. In the
summer, he and his brothers bought a new ball that was in perfect
condition. However, in the winter they noticed that the ball was not
the same. It seemed to have less volume even though there were no
leaks in the ball! Why?
Is it possible for a rock to be shaped by forces in the Earth. This picture could be described as a/an
Answer: Yes
Explanation:
Different force on earth such as wind ocean currents etc make the rocks in earth crests to be change in their shape and size and they moves to different plates.
What is rock cycle?Rock cycle is the process by which rocks are transforming from one type to the other by the action of wind, water etc.The land is eroded and shaped by wind, water, and ice.
The landscape is dramatically and frequently violently altered by volcanic activity and earthquakes. And over a much longer period of time, the shifting of the earth's plates gradually rearranges the continents and oceans.
These mechanisms all have an impact on the Arctic and Antarctica. We'll go through each in general and in relation to the polar areas specifically.
The three main causes of erosion, or the carrying away of rock, silt, and soil, are wind, water, and ice. Weathering, or the physical or chemical degradation of the minerals in rock, is separated from erosion.
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what is called when a paragraph studies data carefully
✅Paraphrasing and summarizing .✅
IamSugarBee
Someone drops a book on the floor, and it makes a loud noise. At that time, you turn to look at the person who dropped the book. Turning and looking at the person who dropped the book is an example of a…
A. Phototropism
B. Response
C. Hydrotropism
D. Stimulus
Answer:
D
Explanation:
HURRY PLS!
A wave has a wavelength of 915 meters. what is the frequency of the light?
Answer:
327.8689 (Hz)
0.3279 (KHz)
0.0003 (MHz
0 (GHz)
Using the choices below, which is the complete symbol for the isotope that has the following subatomic particles: 19 protons, 21 neutrons, and 18 electrons.
(A: 40 19 K -1)
(B: 40 21 Sc +1)
(C: 38 19 K +1)
(D: 40 19 K +1)
(E: 39 18 Ar +1)
a. A
b. B
c. C
d. D
e. E
Answer:
Option D. ⁴⁰₁₉K⁺¹
Explanation:
The following data were obtained from the question:
Proton number = 19
Neutron number = 21
Electron number = 18
Complete symbol of isotope =.?
Next, we shall determine the atomic number of the isotope. This is illustrated below:
Atomic number of an element is simply the number of protons in the atom of the element. Thus,
Atomic number = proton number
Proton number = 19
Therefore,
Atomic number = proton number = 19
Since the atomic number of the isotope is 19, the isotope is simply potassium with symbol K.
Next, we shall determine the mass number of the isotope. This can be obtained as follow:
Proton number = 19
Neutron number = 21
Mass number =.?
Mass number = Proton + Neutron
Mass number = 19 + 21
Mass number = 40
Next, we shall determine the charge on the isotope. This can be obtained as follow:
Proton number = 19
Electron number = 18
Charge =.?
Charge = Proton – Electron
Charge = 19 – 18
Charge = +1
Summary:
Atomic number = 19
Mass number = 40
Symbol = K
Charge = +1
Complete symbol = ⁴⁰₁₉K⁺¹
How much energy is required to heat 23 grams of iron from 1150 degrees celsius to 2000 degrees Celsius? The melting point of iron is 1538 degrees celsius and the specific heat capacity is 0.444 J/g*C when it is in a solid and 0.450 J/g* C when it is liquified. Latent heat of Fusion of iron is 13.8kj/mol and Latent Heat of Vaporization of iron 349.6 kj/mol
Answer:
150000 degrees
Explanation:
Based on the results the students record, which group makes the most accurate measurements of the object?
Answer:
B.
Explanation:
It’s because when you subtract 78.5 and 77.5 you get 1. And when you do 79.5 and 78.5 you get 1 too. I know this because I got the answer right
How are the atoms in an object affected when the temperature of the object increases? *
They join together.
They vibrate faster.
They vibrate slower.
They split apart.
1. The human eye can detect wavelengths of light as short as 0.000037 cm. What is this
wavelength in nanometers?
Answer:
0.000037 cm is 370 nanometers
Explanation:
How many joules of heat are absorbed when 70.0 grams of water is completely vaporized at its boiling point ?
Answer: The answer would be 158,200
What is this phenomenon called?
A.
codominance
B.
coinheritance
C.
incomplete dominance
D.
single gene dominant/recessive trait
what bond is Mg3(PO4)2
What is the total number of hydrogen atoms contained in one molecule of (NH4)2C204?
6
8
4
2
Answer:
=8 atoms
Explanation:
In (NH4)2C2O4 there are four moles of Hydrogen in the compound (NH4), but there two molecules of (NH4) in this compound. That's what the 2 in (NH4)2 means, so multiply 4 x 2 = 8.
Hope this helps (:
