Answer:
The answer is slightly above 0°C.
Explanation:
The ice melts and absorbs 330 J/g × 100 g = 33000 joules.
Cooling 400 g of water from 25°C to 0°C requires
4 J/K-g × 400 g × 25°C = 40000 joules
The heat taken to melt is almost enough to cool the water all of the way to 0°C.
The answer is slightly above 0°C.
A group of students removed the plastic insulation around a wire. They wrapped the uninsulated wire around a steel rivet 50 times in order to make an electromagnet. They connected the wires to a battery to make a complete circuit. They tried to pick up some steel washers, but nothing happened. Below is the advice they received from other groups in the class. What advice should they take to get their electromagnet to pick something up?
a . use insulated wire
b. wrap the wire around the nail more times
c. try picking up aluminum paper clips instead of the steel washers
d. add another d-cell to the circuit
Answer:
d. add another d-cell to the circuit
Explanation:
To make the electromagnet pick something, the student should add another d-cell to the circuit.
Simply, the electromagnet set up is generating very weak magnetic fields.
To produce an electromagnet, there must be an interaction between electric fields an conductor. As the wire turns around in the vicinity of the electric field, it induces magnetism. The number of turns of wire here is pretty considerable. But the electric field is very weak. Additional d-cell in the circuit will circumvent this problemthe oxidation of glucose by enzymes gives
Answer:
Carbondioxide, water and ATP
Explanation:
The reaction is called aerobic respiration because oxygen from the air is needed for it to work.
!PLEASE HELP ASAP!
Ammonium chloride reacts with calcium oxide to produce ammonia, calcium chloride, and water. If 7.4 grams of ammonia are produced, how many grams of calcium chloride are also
produced?
Answer:
Mass of calcium chloride produced = 24.14 g
Explanation:
Given data:
Mass of ammonia produced = 7.4 g
Mass of calcium chloride produced = ?
Solution:
Chemical equation:
2NH₄Cl + CaO → 2NH₃ + H₂O + CaCl₂
Number of moles of ammonia produced:
Number of moles = mass/molar mass
Number of moles = 7.4 g/ 17 g/mol
Number of moles = 0.435 mol
Now we will compare the moles of ammonia and calcium chloride.
NH₃ : CaCl₂
2 : 1
0.435 : 1/2×0.435 = 0.2175 mol
Mass of calcium chloride produced:
Mass = number of moles × molar mass
Mass = 0.2175 mol ×110.98 g/mol
Mass = 24.14 g
According to Wikipedia the average volume of a human flatulence event is 185ML if the average body temperature is 98.6°F in the atmospheric pressure is 760.0 tour how many moles of gas does the average fart contain
Answer:
0.00726mol
Explanation:
Using general gas equation,
PV = nRT
Where;
P = pressure
V = volume
n = number of moles
R = gas constant (0.0821 L atm mol/K)
T = temperature
First, we need to convert the units of each variable
Volume = 185mL = 0.185L
Pressure = 760.0 torr = 1 atm
Temperature = 98.6°F = 310.15K
PV = nRT
1 × 0.185 = n × 0.0821 × 310.15
0.185 = 25.46n
n = 0.185/25.46
n = 0.00726mol
A packaging engineer is designing a container to hold hydrogen peroxide. The engineer knows that light speeds up the chemical reaction that
changes hydrogen peroxide into oxygen and water. How might the engineer use
that information when designing the container?
It’s science *
The Top Thrill Dragster, a rollercoaster at Cedar Point in Ohio, soars through the air at 176ft/sec. How fast is this in mph?
The rollercoaster has a speed of 176 ft/sec. This can be converted to miles per hour. The speed is equivalent to 120 mph.
What is speed ?Speed is a physical quantity measuring the distance travelled by an object per unit time. Speed is a scalar quantity. The rate of speed is called velocity.
The speed can be expressed in different units. such as m/s, km/h, ft./s miles per hour etc. These units can be interconverted using specific relations.
One ft/s = 0.682 mph
then, 176 ft./s = 0.682 × 176 = 120 mph.
Therefore, the speed of the roller coaster is 120 mph.
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what is the mass of element P which reacts with 1 .62g of element Q to form a compound with formula Q2p3
(relative atomic mass p,16;Q,27)
Mass of element P = 1.44 g
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
MW Q₂P₃ = 2.27 + 3.16=102 g/mol
Mass Q₂P₃ (MW=102 g/mol) :
[tex]\tt mass~Q_2P_3=\dfrac{MW~Q_2P_3}{2.Ar~Q}\times mass Q\\\\mass~Q_2P_3=\dfrac{102}{2\times 27}\times 1.62\\\\mass~Q_2P_3=3.06~g[/tex]
Mass P (Ar=16) :
[tex]\tt mass~P=\dfrac{3.Ar~P}{MW~Q_2P_3}\times mass~Q_2P_3\\\\mass~P=\dfrac{3.16}{102}\times 3.06\\\\mass~P=1.44~g[/tex]
or you can solve it with mol :
Reaction
3P + 2Q ⇒ Q₂P₃
mol Q :
[tex]\tt \dfrac{1.62}{27}=0.06[/tex]
mol P :
[tex]\tt \dfrac{3}{2}\times 0.06=0.09[/tex]
mass P :
[tex]\tt 0.09\times 16=\boxed{\bold{1.44~g}}[/tex]
Which of the following is an example of a chemical change?
A. Sugar Dissolving
B. Eggs frying
C. Ice melting
D. Flour and salt being mixed together
Answer:
Eggs Frying
Explanation:
;)
Increasing temperature increases the number of collisions and the potential energy of the colliding molecules and
decreases the reaction rate.
True or False PLZ HELP!!
Energy must be removed from a liquid to change it to a solid.
True or false?
Answer: F
Explanation:
Brainlist me
elements in the same period have the same what ?
Answer:
Elements in the same period have the same number of atomic orbitals.
Explanation:
The number of orbitals depends on the row. (E.g. all elements in the top row have the same number of atomic orbitals: 1. All elements in the second row have 2 atomic orbitals for their electrons.)
PLEASE answer these for a brainlist
What are some examples of the flint water crisis? What are adults experiencing in their water and what are the effects on the kids?
What are the safe levels of Lead exposure?
What is the relationship between the blood levels in people and crime rate?
What was the decision made by Flint to save money on water?
What happened in October 2015? How did the water switch affect the people's blood lead levels?
Answer:
avada kadvera
Explanation:
what comes around goes around
The two gases, H2 and O2, were allowed to effuse under the same conditions through a pinhole. If the rate of effusion of O2 was 4.80 x 10-2 ms-1, what is the rate of effusion of H2?
The rate of effusion of H₂ : 7.2 x 10⁻² m/s
Further explanationGraham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
or
[tex]\rm M_1\times r_1^2=M_2\times r_2^2[/tex]
MW₁ O₂ = 32 g/mol
MW₂ H₂ = 2 g/mol
[tex]\tt \dfrac{1.8\times 10^{-2}}{r_2}=\sqrt{\dfrac{2}{32} }\\\\\dfrac{(1.8\times 10^{-2})^2}{r_2^2}=\dfrac{2}{32}\\\\r_2=0.072=7.2\times 10^{-2}~m/s[/tex]
Which element (Na or Cl) is more likely to steal an outer electron from the other?
Answer:
Cl is more likely to than Na
Explanation:
The question asks for the element more take up an electron from the other
The ability of an atom to take take or give electrons in a chemical reaction, depends on its electron affinity and ionization energy, respectively
Chlorine, Cl, has the highest electron affinity in the periodic table which makes it attract electrons more towards itself
Sodium, Na, has a low ionization energy (about 2/5 of that of chlorine) than chlorine, Cl, making sodium more readily able to give its valence electron in a reaction
Therefore, Cl is more likely to take up an outer electron from Na.
2
Which group of substances contains only compounds?
A C, O2, CH4,
B H, He, F
C CO2, CaCO3 , CH4
D F, Fe, He
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Which of the following correctly describes interactions between Earth's spheres?
(A)The four spheres are closely related, and rarely interact.
(B)The four spheres are closely related, and continuously interact.
(C) The four spheres are drastically different and never interact.
(D)The four spheres are identical and continuously interact
The four spheres are closely related, and continuously interact.
The earth is divided into four spheres;
Atmosphere - composed of gasesHydrosphere - composed of waterBiosphere - composed of living thingsLithosphere - composed of the solid part of the earthMatter cycles through all these four spheres of the earth via the diverse biogeochemical cycles that exist in nature such as oxygen cycle, carbon cycle, nitrogen cycle etc. Most of these cycles have components in all the four earth spheres.
Therefore, the four spheres are closely related, and continuously interact.
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greg please answer me okay
Answer:
ok
Explanation:
Answer:
Hi
Explanation:
Good morning, thx for the free points, have a great day/night, and stay safe!
how do the mass and height of an object affect the gravitational potential energy?
A. height has great a greater effect than mass gravitational potential energy
B. mass and height have the same effect on gravitational potential energy.
C. height has almost 10 times the effect on gravitational potential energy then mass has.
D. Mass has a greater effect than height on gravitational potential energy.
Answer:
B. mass and height have the same effect on gravitational potential energy.
Explanation:
Both mass and height have the same effect on the gravitational potential energy of body.
Gravitational potential energy is the energy of a body due to that of another body. It usually the energy at rest in a body.
It is mathematically expressed as;
G.P.E = m x g x h
m is the mass
g is the acceleration due to gravity
h is the height
We see that both the height and mass are directly proportional to the gravitational potential energy and as such, they have the same effect.
(h) Bohr stated that the energy of the electron is quantised. What does this mean?
Explanation:
It suggests that the extranuclear part consists of electrons in specific spherical orbits around the nucleus.
The concept is based on the premise that the electrons move round the nucleus in certain permissible orbits or energy levels. The ground state is the lowest energy state available to the electrons. It is the most stable state. The excited state is any higher energy level than the ground state. An electron in an energy level has a definite amount of energy associated with it at that level. The electron can undergo transitions from one level to another. This way energy of an electron is quantized to each level.It is January. The temperature is 33°F, and the wind is blowing. Huge clouds are coming in from the west.
Based on these circumstances, what is a reasonable prediction?
It will probably snow today.
A heat wave will come through today.
The sun will come out for the rest of today.
It will probably not snow today.
Answer:
It’s A
Explanation:
Got it right on edge just wanted to give the simple answer
Answer:
A. It will probably snow today.
what volume is occupied by5.3 mol of c02 at 28c and a pressure of .998 atm
Answer:
V = 131.23 L
Explanation:
Given data:
Moles of CO₂ = 5.3 mol
Temperature = 28°C
Pressure = 0.998 atm
Volume occupied = ?
Solution:
Formula:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
28+273 = 301 K
0.998 atm ×V = 5.3 mol × 0.0821 atm.L/ mol.K × 301 K
V = 130.97 atm.L / 0.998 atm
V = 131.23 L
Can you help me please lol
Answer: Yes
Explanation:
A car covers a distance of 112.6km in 1.8h. Calculate its speed in m/s
Answer:
17.38 meters per second
Explanation:
Speed is distance over time so 112.6 / 1.8 hours =62.5555555556 km per hour. TO find it in m/s just divide 62.5555555556 by 3.6 and that is approximately equal to 17.38 meters per second, or at least something close to it.
Please mark brainliest!!! Thanks.
Iridium has two naturally occurring isotopes, Iridium-191 and Iridium-193. If the average atomic mass of orodum s 192.217, what are the average percent abundances of each isotope?
Answer:
The percent isotopic abundance of Ir-193 is 60.85 %
The percent isotopic abundance of Ir-191 is 39.15 %
Explanation:
we know there are two naturally occurring isotopes of iridium, Ir-191 and Ir-193
First of all we will set the fraction for both isotopes
X for the isotopes having mass 193
1-x for isotopes having mass 191
The average atomic mass is 192.217
we will use the following equation,
193x + 191(1-x) = 192.217
193x + 191 - 191x = 192.217
193x- 191x = 192.217 - 191
2x = 1.217
x= 1.217/2
x= 0.6085
0.6085 × 100 = 60.85 %
60.85% is abundance of Ir-193 because we solve the fraction x.
now we will calculate the abundance of Ir-191.
(1-x)
1-0.6085 =0.3915
0.3915× 100= 39.15 %
In a balanced equation, the number of each type of atom on the reactant side ____________ the number of each type of atom on the product side.
A.) Doubles
B.) Equals
C.) Halves
D.) Triples
Answer:
the answer is B Equals i just took the test
Someone please help will mark as brainliest
(Someone please help!)
Your eyes see different wavelengths of light as different ________.
spectrum
amplitude
color
detectors
Answer:
COLORS
Explanation:
i looked it up lol
answer: spectrum
explanation: your eyes see different wavelengths of light as different spectrum.
hope it helps sis
Which equation is balanced?
Mg3N2 + H2O 3MgO + 2NH3
C3H8 + 5O2 H2O + 3CO2
Zn + 2HCl ZnCl2 + H2
3H2SO4 + 2Fe Fe2(SO4)3 + H2
Answer:
it's the third one
Explanation:
in the first one oxygen molecules aren't balanced
the second ok me oxygen isnt balanced
and the fourth one hydrogen isn't balanced
hope it helps ;)
A balanced equation is a representation in which the coefficients of the individual atoms of a molecule or compound are the same on both the left and right of the equation.
The correct answer is:
Option C. Zn + 2 HCl --------> ZnCl₂ + H₂
This can be explained as:
In the first equation, the number of H and O atoms are not balanced.In the second case, the atoms of hydrogen and oxygen are not the same on the sides of the equation.In the third reaction between zinc and hydrochloric acid, all the atoms of the reaction are balanced.In the fourth reaction, the hydrogen atoms are not balanced.Therefore zinc and hydrochloric acid reaction are balanced.
To learn more about balancing the reactions follow the link:
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The net force on a 300 kg lion is 3452 N as he runs after a deer. What is the lion's acceleration?
Multiply:
(3.4 x 10^5)(1.2 x 10^-3)
4.08 x 10^2
4.08 x 10^-8
4.8 x 10^2
4.08 x 10^-15
Answer:
4.08 x 10^-8
Explanation: