Energy release is exothermic reaction whiles energy absorb is endothermic reaction
Explanation:
Exothermic reaction is when the reactant is above the product while endothermic the product is below the reactant in the diagrams we have some part as activation energy
Which of the following isotopes has the same number of neutrons as phosphorus-31?
Answer: 32/16S which is sulfur
The isotopes that carry the exact same number of neutrons as they are in phosphorous-31 would be:
32/16S
The isotopes are described as the formations of element(two or more) that contains exact same proton numbers yet a distinction in the number of neutrons inside the nuclei.This leads the atomic isotopes to possess similar atomic numbers yet a varied mass number.The isotopes that carry the exact same number of neutrons as they are in phosphorous-31(16 neutrons) would be Sulphur(16 electrons).Thus, 32/16S is the correct answer.
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How many joules of heat are absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100.°C?
To calculate the heat absorbed by the water, we use the formula Q = mcΔT, where Q represents the heat energy absorbed, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Substituting the given values, we find that approximately 136,872 joules of heat are absorbed to raise the water's temperature from 25°C to 100°C.
Explanation:This question is asking how much heat energy, in joules, is required to heat 435 grams of water from 25°C to 100°C at atmospheric pressure. The formula used to calculate this is Q = mcΔT, where Q represents the heat energy absorbed, m is the mass of the substance (water), c is the specific heat capacity, and ΔT is the change in temperature.
For water, the specific heat capacity (c) is 4.184 J/g°C. The mass (m) of the water is given as 435 g. The change in temperature (ΔT) is the final temperature minus the initial temperature, which is 100°C - 25°C = 75°C.
Substituting these values into the equation gives us, Q = (435 g) × (4.184 J/g°C) × (75°C), which equals approximately 136,872 joules. This is amount of heat absorbed by the water to raise its temperature from 25°C to 100°C at 1 atm.
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What is the chemical formula for iron(II) hydroxide?
Fe, OH
Fe(OH)
FeOH
0 FeOH
Answer: None of the given options .
Explanation: The chemical formula of Iron (II) hydroxide can be written as
Fe (OH)2
As iron is present in its +2 state and hyrdoxide ion has charge of one negative unit .
Thus iron hydroxide can be written as the above and none of the given options is correct.
what is co2 compound made of
Answer:
two oxygen atoms covalently bonded to a single carbon atom.
Explanation:
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Answer:
Carbon, and two Oxygen atoms
Explanation:
CO2, or Carbon Dioxide is made up of one Carbon (C) atom, and two Oxygen (O) atoms.
Which of these will change if the air in a
closed bottle is heated?
A
B
C
D
the mass of the air
the composition of the air
the air pressure in the bottle
the number of air molecules in the bottle
Answer:
The air pressure in the bottle will change.
Explanation:
According to Gay-Lussac's Law, one of the main gas laws, the pressure of gas is directly proportional to the temperature of the gas. This means that as the temperature of the gas increases, the pressure of the gas will increase as well. Therefore, if you heat a closed bottle, the air pressure inside the bottle will change (increase).
What would be the original temperature of a gas that has a volume of 2.0 L and a pressure of 2.0 ATM and an unknown temperature that the volume increased to 3.5 L in its pressure decreased to 1.0 ATM if the final temperature is measured to be 11°C
Answer:
= 51.57 °C
Explanation:
The combined gas equation shows that P₁V₁/T₁=P₂V₂/T₂ where P represents pressure, V represents volume and T absolute temperature
From the information provided in the question,
Since we are finding the initial or original temperature, we can make T₁ the subject of the formula.
T₁=P₁V₁T₂/P₂V₂
P₁=2.0 ATM
P₂= 1.0 ATM
V₁=2.0 L
V₂= 3.5 L
T₁=?
T₂= (11+273) K=284 K
Using these values in the formula:
T₁= (2.0 ATM × 2.0 L× 284 K)/(1.0 ATM × 3.5 L)
=324.57 K
324.57-273= 51.57 °C
. 8750 J of heat are applied to a piece of aluminum, causing a 66.0 oC increase in its temperature. The specific heat of aluminum is 0.9025 J/g oC. What is the mass of the aluminum?
The mass of aluminum supplied to given quantity of heat in order to increase its temperature is 146.9 g.
The given parameters;
heat applied to the aluminum, Q = 8750 Jincrease in temperature of the aluminum Δt = 66 ⁰Cspecific heat of aluminum, c = 0.9025 J/g⁰CThe mass of aluminum is calculated as follows;
Q = mcΔt
where;
m is the mass of the aluminum[tex]m = \frac{Q}{c \Delta t} \\\\m = \frac{8750}{0.9025 \times 66} \\\\m = 146.9 \ g[/tex]
Thus, the mass of aluminum supplied to given quantity of heat in order to increase its temperature is 146.9 g.
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Consider the nuclear equation below.
239 pu------------>x + 4 He
94 2
What is X?
1.235 Cm
96
2.243 U
92
3.235 U
92
4.243 Cm
96
Answer:
²³⁵₉₂U
Explanation:
Properly writing the equation we have:
²³⁹₉₄Pu → ᵃₙX + ⁴₂He
The unknown atom here is X with mass number "a'' and atomic number ''n''
In balancing chemical equations, the mass number and atomic number must be conserved. This implies that the sum of atomic numbers i.e subscript on the left hand side must be equal to that on the right hand side. Also, the sum of the mass numbers i.e superscript on the left hand side must be equal to that on the right hand side.
For the mass numbers:
239 = a + 4
a = 239 - 4 = 235
For atomic numbers:
94 = n + 2
n = 94 -2 = 92
The atom X, has a mass number of 235 and an atomic number of 92.
This is can be written as ²³⁵₉₂X
This is option 3
how many moles of gas are present if p=11 atm, V=12L, T=185k?
Answer:
8.69 mol.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 11.0 atm).
V is the volume of the gas in L (V = 12.0 L).
n is the no. of moles of the gas in mol (n = ??? mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 185.0 K).
∴ n = PV/RT = (11.0 atm)(12.0 L)/(0.0821 L.atm/mol.K)(185.0 K) = 8.69 mol.
What type of reaction is Zn + CuCl2 → Cu + ZnCl2?
Answer:
Single-replacement
Explanation:
The reaction is [tex]Zn + CuCl_{2}[/tex] → [tex]Cu + ZnCl_{2}[/tex] is a kind of single displacement reaction.
What is single displacement reaction?In a single-displacement reaction, sometimes referred to as a single replacement reaction but rather an exchange reaction, one element in a compound would be swapped out for another.
What is reaction?When one reacts with another kind of element the it will form different kind of atom or compound is referred as reaction.
The reaction is [tex]Zn + CuCl_{2}[/tex] → [tex]Cu + ZnCl_{2}[/tex] is a kind of single displacement reaction.
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What kind of chemical reaction does the chemical equation sodium + chlorine → sodium chloride represent? A. combustion B. decomposition C. single replacement D. synthesis
Answer:
d. synthesis
Explanation:
it uses the formula a+b=ab.
Answer:
synthesis
Explanation:
A + B → AB
A simple example of a synthesis reaction is the formation of water from its elements, hydrogen, and oxygen:
2 H2(g) + O2(g) → 2 H2O(g)
Determine how many atoms of pure silver will be created when 19.83 x 1023 atoms of copper are used in the following reaction:
Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag
Answer:
[tex]\boxed{3.966 \times 10^{24}\text{ atoms of Ag}}[/tex]
Explanation:
(a) Balanced equation
Cu + 2AgNO₃ ⟶ Cu(NO₃)₂+ 2Ag
(b) Calculation
You want to convert atoms of Cu to atoms of Ag.
The atomic ratio is ratio is 2 atoms Ag:1 atom Cu
[tex]\text{Atoms of Ag} = 19.83 \times 10^{23}\text{atoms Cu} \times \dfrac{\text{2 atoms Ag}}{\text{1 atom Cu}}\\\\= 3.966 \times 10^{24}\text{ atoms of Ag}\\\\\text{The reaction will produce }\boxed{\mathbf{3.966 \times 10^{24}}\textbf{ atoms of Ag}}[/tex]
Answer:
[tex]3.966\times 10^{24} [/tex] pure silver atoms are produced.
Explanation:
[tex]1 mol = N_A=6.022\times 10^{23} mol^{-1}[/tex]
Atoms of copper = [tex]19.83\times 10^{23} [/tex]
Moles of copper = [tex]\frac{19.83\times 10^{23} }{N_A}[/tex]
[tex]=\frac{19.83\times 10^{23} }{6.022\times 10^{23} mol^{-1}}=3.293 mol[/tex]
[tex]Cu + 2AgNO_3\rightarrow Cu(NO_3)_2 + 2Ag[/tex]
According to reaction, 1 mol of copper atoms gives 2 moles of silver atoms.
Then 3.293 moles of moles of copper will give:
[tex]\frac{2}{1}\times 3.293 mol=6.586 mol[/tex]
Number of silver atoms in 6.586 moles of silver:
=[tex]6.586 mol\times 6.022\times 10^{23} mol^{-1}=3.966\times 10^{24} atoms [/tex]
Which of the following represents a compound?
Answer:
B) H2O
Explanation:
Compound is a pure substance composed of two or more different atoms chemically bonded to one another. Among all choices only H₂O is composed of two atoms, and other choices are composed of only one atom. H₂O is the pure substance composed of chemically bonded two atoms (hydrogen atoms and oxygen atom).
Answer:
H₂O
Explanation:
Compound consists of combinations of elements. H (Hydrogen) is an element. O-16 and H-3 are stable isotopes of O (Oxygen) and H (Hydrogen), which are elements. H₂O is compound formed by two elements: Hydrogen and Oxygen.
Which of the following is NOT a characteristic of liquids?
A. no significant attraction between particles
B. less fluid than gases
C. more dense than gases
D. exhibits viscosity
Answer:
a.
Explanation:
Diamond, graphite, and fullerenes share what property? A. They are all made of carbon (C) bonded to a metal. B. Their shape. C. They are all made of carbon (C). D. They are all good conductors.
Answer:
They are all made of carbon
Explanation:
Diamond, graphite, and fullerenes are all made of carbon.
Hope this helps!
Diamond, graphite, and fullerenes "Are all made of carbon".
What is a Diamond?The crystal structure known as diamond cubic would be used to describe the solid form of something like the element carbon known as diamond.
What are fullerenes?
Due to its resemblance to the appearance of a soccer ball, fullerenes with a spherical shape are frequently described as "buckyballs" or Buckminster fullerenes.
Therefore, the correct answer is an option (A)
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Which of the following correctly describes the importance of the nitrogen cycle?
Are there any answer choices? If not, here are some possible responses you may see (that are correct, of course):
*It is used in the process of decomposition.
*It is used to release ammonia from dead animals that ultimately gets turned into nitrogen-based substances.
*It involves the formation of nitrates into nitrogen to complete the nitrogen cycle.
I hope I helped!
If you find the answer choices, just comment them down below and I will gladly tell you which one is correct. :)
The compound FeCl3 is made of
Answer:
iron n chlorine
Explanation:
Answer:
The compound FeCl3 is made of IRON AND AND CHLORINE
Ice floats on water,but an iron nail sinks.
Answer:
True
Explanation:
Ice floats on water, for water is more dense than ice, allowing water to "support" the ice on top.
Iron nail, on the other hand, is more dense than water, allowing the nail to sink.
Answer: True an iron nail is more dense than the water and Ice the ice is less dense than the water making it float. Hopes this helps :)
Which statement best describes the function of enzymes?
Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells. They are vital for life and serve a wide range of important functions in the body, such as aiding in digestion and metabolism.
Enzymes lower the activation energy level of a chemical reaction, thus making it so the reaction will proceed.
What are enzymes?Enzymes are proteins that help speed up chemical reactions in our bodies.
Enzymes are proteins that speed up the rate of a chemical reaction without being used up during the reaction.
They are biological catalysts. Catalysts, as we know lower the activation energy for reactions and speed them up.
The lower the activation energy for a reaction, the faster the rate.
Thus enzymes speed up reactions by lowering the activation energy.
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What is the formula of titanium(IV) bromide?
Answer:
[tex]\boxed{\text{SnBr}_{4}}[/tex]
Explanation:
The name tells you that this is a binary compound (contains two elements).
It contains a metal and a nonmetal, so it is a binary ionic compound. The general rule is:
Name of compound = name of metal name of ion (two words)
Name of metal = tin(IV), so the tin ion has a charge of 4+
Name of ion = bromide. Br is in Group 17, so bromide ion has charge of 1-.
[tex]\rm Sn$^{4+}$ + 4Br$^{-} \longrightarrow \,$ SnBr$_{4}$\\\\\text{The formula is} \boxed{\textbf{SnBr}_{4}}[/tex]
HELP PLEASE NEED URGENT HELP!!!!!!!
C) It goes up by one
An object was measured by a worker as
17.4cm long, however, the manufacturer
specifications list the length of the object at
17.9cm. What is the percent error in the
workers measurement?
Answer:
[tex]\boxed{2.8 \, \%}[/tex]
Explanation:
[tex]\text{Percent error} = \dfrac{\lvert \text{Measured - Actual}\lvert}{ \text{Actual}} \times100 \, \%[/tex]
Data:
Predicted = 17.4 cm
Actual = 17.9 cm
Calculation:
[tex]\text{Percent error} = \dfrac{\lvert 17.4 - 17.9\lvert}{17.9} \times 100 \, \% \\\\= \dfrac{\lvert-0.5\lvert}{17.9} \times 100 \, \% = \dfrac{0.5}{17.9} \times 100 \, \% \\\\= 0.028 \times 100 \, \% = \textbf{2.8 \%}\\\\\text{The percent error in the measurement is } \boxed{\textbf{2.8 \%}}[/tex]
Some scientists hypothesize that Earth's ozone layer is being damaged by
a.
ultraviolet radiation
c.
plant life on Earth
b.
chlorofluorocarbons
d.
global warming
Answer:
Some scientists hypothesize that Earth's ozone layer is being damaged by chlorofluorocarbons .
Explanation:
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Answer:
chlorofluorocarbons
20 grams of water. She poured out 15 grams. Which of the following physical properties of the water changes?
A .Boiling point
B. Density
C .Electrical conductivity
D .Volume
Answer:
Volume only intrinsic
Explanation:
Can someone help me with 1 to 4 plz. Fast
Answer: 1A: F, 2A: T, 3A: F
Explanation: 1A: Science impacts our everyday life in many ways, from the technology we use to text and call, to the medicine we take for headaches and allergies! There are many brances of science that you can specialize in, whether it be studies space or animals!
2A: Scientists are problem solvers, which means they have to be creative.
3A: Everyone is capable of thinking scientifically!
Which order shows the levels of organization from largest to smallest?
organism, organ system, cell, organ, tissue
organism, tissue, organ system, organ, cell
organism, organ, organ system, cell, tissue
organism, organ system, organ, tissue, cell
Answer:
organism, organ system, organ, tissue, cell
Explanation:
D
I got ir right:)
Which is not part of John Dalton’s atomic theory?
Atoms of different elements have different masses.
All atoms of the same element have the same mass.
Atoms are made up of smaller particles.
All elements are composed of atoms.
The correct answer is C. Atoms are made up of smaller particles.
Explanation:
John Dalton was an English chemist and physicist mainly known for proposing one of the first formal theories related to atoms by the end of the 19th century. In this theory, Dalton explained atoms were the basic unit for all elements and cannot be divided into smaller participles, also he proposed atoms of the same elements are identical including their masses and those of different elements are different. This means the statement that is not part of Dalton's atomic theory is "Atoms are made up of smaller particles" because for Dalton atoms are the smallest unit and cannot be divided into smaller parts, this was proved as false later as they can be divided into sub-particles.
Hamad stated that Nitrogen gas is noncombustible so is water vapour. If Both nitrogen and water are in gaseous state then why the term gas and vapour were used by Hamad?
Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form. Water vapour in the atmosphere is often below its boiling point. When water is boiled the water evaporates much faster and makes steam.
Both vapor and gas contains the gaseous molecules. But vapor state contains a second phase too along with gas whereas, gaseous state only contain one component.
What is vapor?Vapor is a state of matter consists of two component. Solid and gas or liquid and gas. Thus vapor is formed when a gas comes in contact with liquid or solid.
There forms an equilibrium between gaseous state and liquid or solid state. For example water forms water vapor when the liquid water boils to form gases, similarly other liquids such as acids forms their vapor.
Gases such as oxygen, hydrogen, nitrogen etc. forms only gases and thus have only one component. Thus we used to say nitrogen gas, hydrogen gas etc.
Therefore, vapor is a combination of two states and gas in a single state. Water forms vapor and can be called water vapor but nitrogen is called gas only.
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Which is the most important factor in determining the state of a substance?
the size of the atoms in a substance
the number of molecules in a substance
the position of the electrons on the outer valence shells
the balance between intermolecular forces and kinetic energy
Answer:
The balance between intermolecular forces and kinetic energy
Explanation:
If the kinetic energies of the particles are not strong enough to overcome the intermolecular forces, the particles will be locked in place in a crystal lattice. The substance will be a solid.
If the kinetic energies of the particles are slightly stronger than the intermolecular forces, the particles will be able to slide past each other. The substance will be a liquid.
If the kinetic energies of the particles are much stronger than the intermolecular forces, the particles will be escape completely from the attractions of their neighbours. The substance will be a gas.
The balance between intermolecular forces and kinetic energy. thus option D is correct.
What is kinetic energy?Kinetic energy, form of energy that an object or a particle has by reason of its motion.
If the kinetic energies of the particles are not strong enough to overcome the intermolecular forces, the particles will be locked in place in a crystal lattice. The substance will be a solid.
If the kinetic energies of the particles are slightly stronger than the intermolecular forces, the particles will be able to slide past each other. The substance will be a liquid.
If the kinetic energies of the particles are much stronger than the intermolecular forces, the particles will be escape completely from the attractions of their neighbours. The substance will be a gas.
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A compound contains C, H, and O atoms. When 1.130 g of the compound is burned in oxygen, 1.064 g CO2 and 0.3631 g H2O are produced. What is the empirical formula of this compound?
Answer:the empirical formula is C3H8O2
Explanation:
You need to determine the relative number of moles of hydrogen and carbon. So you first calculate the molar mass of CO2 and H20 Atomic weight of carbon = 12.0107 Atomic weight of hydrogen = 1.00794 Atomic weight of oxygen = 15.999 Molar mass CO2 = 12.0107 + 2 * 15.999 = 44.0087 Molar mass H2O = 2 * 1.00794 + 15.999 = 18.01488 Now calculate the number of moles of CO2 and H2O you have Moles CO2 = 2.086 g / 44.0087 g/mole = 0.0474 mole Moles H2O = 1.134 g / 18.01488 g/mole = 0.062948 mole Calculate the number of moles of carbon and hydrogen you have. Since there's 1 carbon atom per CO2 molecule, the number of moles of carbon is the same as the number of moles of CO2. But since there's 2 hydrogen atoms per molecule of H2O, The number of moles of hydrogen is double the number of moles of H2O Moles Carbon = 0.0474 Moles Hydrogen = 0.062948 * 2 = 0.125896 Now we need to determine how much oxygen is in the compound. Just take the mass of the compound and subtract the mass of carbon and hydrogen. What's left will be the mass of oxygen. Then divide that mass by the atomic weight of oxygen to get the number of moles of oxygen we have. 1.200 - 0.0474 * 12.0107 - 0.125896 * 1.00794 = 0.503797 Moles oxygen = 0.503797 / 15.999 = 0.031489 So now we have a ratio of carbon:hydrogen:oxygen of 0.0474 : 0.125896 : 0.031489 We need to find a ratio of small integers that's close to that ratio. Start by dividing everything by 0.031489 (selected because it's the smallest value) getting 1.505288 : 3.998095 : 1 The 1 for oxygen and the 3.998095 for hydrogen look close enough. But the 1.505288 for carbon doesn't work. But it looks like if we double all the numbers, we'll get something close to an integer for everything. So do so. 3.010575 : 7.996189 : 2 Now this looks good. Rounding everything to an integer gives us 3 : 8 : 2 So the empirical formula is C3H8O2