Answers:
Nuclear reactions can change an atom of one element into an atom of another element. ( fourth choice)
Atoms contain smaller particles: protons, neutrons, and electrons.( first choice)
Atoms of a given element can have different numbers of neutrons.( third choice)
Answer:
Atoms contain smaller particles: protons, neutrons, and electrons.
Atoms of a given element can have different numbers of neutrons.
Nuclear reactions can change an atom of one element into an atom of another element.
All atoms of a given element have the same number of protons.
Explanation:
Electrons, protons, and neutrons, and isotopes had not yet been discovered.
The only statement that agrees with Dalton's atomic theory is
B. Atoms of a given element can bond to other atoms only in specific ways. Dalton used this postulate to formulate the Laws of Definite Composition and of Multiple Proportions.
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C) It goes up by one
. 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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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.
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!
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 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).
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
The compound FeCl3 is made of
Answer:
iron n chlorine
Explanation:
Answer:
The compound FeCl3 is made of IRON AND AND CHLORINE
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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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.
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
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Why would an atom become an ion?
An atom becomes an ion to achieve electrical stability. This can occur either by the atom losing electrons and becoming a cation (positive ion), or gaining electrons and becoming an anion (negative ion). This process, known as ionization, typically happens during chemical reactions.
Explanation:An atom may become an ion in pursuit of electrical stability. Atoms are originally neutral, containing equal numbers of protons (positive charge) and electrons (negative charge). Certain atoms become more stable by gaining or losing electrons, altering the balance between protons and electrons and creating a net charge, thereby becoming ions.
There are two types of ions: cations and anions. Cations are positive ions that form when an atom loses electrons. For instance, a sodium atom (Na) could lose one electron to become a cation (Na+). On the other hand, anions are negative ions formed when an atom gains electrons. For example, an oxygen atom could gain two electrons to become an anion (O2-).
The process where an atom gains or loses electrons to form ions is known as ionization. This atomic transformation usually occurs during chemical reactions, especially in the formation of ionic bonds.
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A nonaqueous solution has a solvent that is not water. Which is an example of a nonaqueous solution?
Answer:
Tincture o iodine.
Explanation:
If a solute is dissolved in a solution that is not water for example, alcohol, ether, carbon disulphide, Carbon tetrachloride and many other carbon based liquids, the resulting solution is classified as a non aqueous solution.
An example of such a solution is tincture of iodine made by dissolving in 1 liter alcohol.
The molarity of iodine is approximately 0.53M
The solution is largely used as a sore disinfectant.
Answer: B
Explanation: on Edg
Compare the strength of the intermolecular forces in solids liquids and gases
Intermolecular forces in solids are strongest than in liquids and gases. Gases have the least strong intermolecular forces. Intermolecular forces are weak and are significant over short distances between molecules (determined by Coulomb’s law). The farther away from the molecules the weaker the intermolecular forces. Since molecules in solids are the closest, the intermolecular force between them as the strongest. Conversely, since gas molecules are farthest apart, the intermolecular forces between them are the weakest.
The strength of intermolecular forces varies in solids, liquids, and gases. They are strongest in solids, due to which molecules or atoms are tightly packed. In gases, they are the weakest, allowing for a greater separation of atoms or molecules. Certain factors like the size and identity of the molecules also influence these forces.
Explanation:Intermolecular forces refer to the attractions between molecules, which determine many of the physical properties of a substance. In solids, liquids, and gases, the strength of these forces varies significantly. In gases, the atoms and molecules are more separated, and intermolecular forces can be almost ignored. On the other hand, in liquids, these forces are strong enough to keep the molecules in contact, but not to prevent them from moving past each other. However, in solids, the intermolecular forces are so strong that the molecules or atoms are tightly packed, making them resistant to changing their shape or volume.
It's important to note that larger and heavier atoms and molecules exhibit stronger dispersion forces (a type of intermolecular force) than smaller and lighter ones. Hence, molecules like F2 and Cl2 are gases at room temperature indicating weaker intermolecular forces, while Br2 is a liquid, and I2 is a solid, representing stronger intermolecular forces. The identity of the molecules also determines the type and strength of the intermolecular attractions possible. Thus, strong intermolecular forces impede vaporization and favor the 'recapture' of gas-phase molecules, resulting in a lower vapor pressure, and vice versa.
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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.
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]
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:
Calculate the mass of 0.750 mol of the following substance. Na3PO4.
****Please help, I'm not quite sure on how to set up a problem to solve! : (
Final answer:
To find the mass of 0.750 mol of Na3PO4, calculate the molar mass by summing the atomic masses of Na, P, and O, and then multiply the molar mass by the number of moles. The mass is found to be 122.955 g.
Explanation:
To calculate the mass of 0.750 mol of Na3PO4, we first need to determine its molar mass. We sum the atomic masses of all the atoms in the compound:
Na (Sodium) has an atomic mass of 22.99 g/mol, and there are 3 Na atoms.
P (Phosphorus) has an atomic mass of 30.97 g/mol, and there is 1 P atom.
O (Oxygen) has an atomic mass of 16.00 g/mol, and there are 4 O atoms.
The molar mass of Na3PO4 is thus calculated as:
(3 × 22.99 g/mol) + (1 × 30.97 g/mol) + (4 × 16.00 g/mol) = 163.94 g/mol
Now, to find the mass of 0.750 mol of Na3PO4, we use the formula:
Mass = moles × molar mass
Mass = 0.750 mol × 163.94 g/mol = 122.955 g of Na3PO4
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.
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 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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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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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
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)
A 6.10 M NaCl can be made by adding [x]g of NaCl to a container and making the volume of water up to the 1.00 L line
Answer:
356.484 g.
Explanation:
Molarity (M) is defined as the no. of moles of solute (NaCl) dissolved in a 1.0 L of the solvent.M = (no. of moles of NaCl)/(volume of the solution (L))
M = 6.10 M, volume of the solution = 1.0 L.
∴ No. of moles of NaCl = (M)(volume of the solution (L)) = (6.10 M)(1.0 L) = 6.10 mol.
∵ no. of moles of NaCl = (mass of NaCl)/(molar mass of NaCl)
∴ Mass of NaCl = (no. of moles of NaCl)(molar mass of NaCl) = (6.10 mol)(58.44 g/mol) = 356.484 g.
NaCl mass : 356.85 grams
Further explanationStoichiometry in Chemistry learn about chemicals mainly emphasizes quantitative, such as the calculation of volume, mass, number, which is related to numbers, molecules, elements, etc
Mole
The mole itself is the number of particles contained in a substance amounting to 6.02.10²³
Mole can also be sought if the amount of substance mass and its molar mass is known
[tex] \large {\boxed {\boxed {\bold {mol = \frac {mass} {molar \: mass}}}} [/tex]
known
M NaCl = 6.10 M
Volume = 1.00 L
asked
NaCl mass
solution
molar mass of NaCl: 23 + 35.5 = 58.5 g / mol
mole NaCl = gram / mass
mole NaCl = molarity x volume
mol of NaCl = 6.1 x 1
mole of NaCl = 6.1
NaCl mass = molar mass x mol
mass of NaCl = 58.5 x 6.1
mass of NaCl = 356.85 grams
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Keywords: mole, NaCl, volume, molarity
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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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.
At what temperature does the solid start melting?
–20°C
0°C
20°C
80°C
Answer:
0 °C
Explanation:
The melting point of a substance is the temperature at which it changes state from solid to liquid.
Different substance have different melting point.
The melting point of ice at 1 atmosphere of pressure is very to 0 °C this is also known as the ice point.
Answer:
0°C
Explanation:
i am a chemistry nerd and that question any chemistry person can answer without questioning there answer.
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
The compound Fe3CI is made of what?
Answer:
nglos324 - fe3c. Iron carbide is an interstitial compound of iron and carbon with the composition Fe- 6.68 wt % Carbon. It is a brittle ceramic material and is produced in carbon steels or cast irons during pseudo-equilibrium cooling from above the eutectoid temperature (723 C).
Explanation: