E is the correct answer because both endothermic and exothermic reactions require activation energy. the reactants have less potential energy than do the products. Energy must be input in order to raise the particles up to the higher energy level.
Answer:
C. Forming the activated complex requires energy,
Explanation:
For any reaction (whether exothermic or endothermic) the reactant molecules need some minimum amount of energy known as Threshold energy.
Reactant molecules have some internal energy and they require some extra amount of energy to reach the threshold energy which is known as activation energy.
This activation energy is required to from an activated complex.
The activated complex is formed where reactant molecules come closer to each other and undergo effective collision. This causes the formation of products.
the number of protons and neutrons in an atom is known as the
A.) isotope. B.) atomic number. C.) mass number. D.) energy level.
Answer:
Its B. Just look at google.
Answer:
The number of protons and neutrons in an atom is known as the mass number. C.)
Which of the following is not present in an atom?
Electron
Element
Neutron
Proton
Answer:
Element
Explanation:
since electron,neutron,and proton are inside of an atom, the answer would be elements, since elements are made up of atoms, but not present in the atom itself.
Answer:
b
Explanation:
Which is a sustainable practice? A. Wind farms B. Clear cutting C. Flood irrigation D. Overfishing
When a practice is sustainable, it means that it can be used over and over through time. Sustainable practices also benefit, rather than harm, the environment. Though it really depends on where you live, the general answer for this would be wind farms since flood irrigation can only happen in certain conditions. Overfishing would destroy a species over time, and clear cutting is obviously harmful to the environment.
The sustainable practice can be described as one that can be seen in A. Wind farms . option A is correct.
What is sustainable practice?It has the capacity to be maintained, upheld, or affirmed. Science of the environment. the property of not being environmentally destructive or depleting natural resources, promoting long-term ecological balance: The committee is creating sustainability criteria for energy-using products.
Sustainable practices promote the health and vitality of the environment, people, and the economy. According to sustainability, resources are limited and should be used prudently with an eye toward long-term goals and the effects of how they are used.
Hence , option A is correct.
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Compare the densities of hydrogen, oxygen, and water.
Answer:
Water is a compound made up of two elements—hydrogen and oxygen. ... They are both colorless, odorless gases , and they both readily react with other elements—making them "reactive" elements. But in many ways they are very different from each other. Hydrogen has the lowest density of all the elements.
which of the following describes the movements of electrons
Answer:
What are the options?
Explanation:
I'll need to know the options in order to answer that.
Isotopes are separated by
A. crystallisation
B. sublimation
C. distillation
D. filtration
In an atomic explosion, enormous energy is released which is due to
A. conversion of chemical energy into heat energy
B. conversion of mechanical energy into nuclear energy
C. conversion of mass into energy
D. conversion of neutrons into protons
Which among the following is a positively charged particle emitted by a radioactive element?
A. Beta ray
B. Alpha ray
C. Cathode ray
D. Gamma ray
Answer:
1. C. distillation
2. B. conversion of mechanical energy into nuclear energy
3. B. Alpha ray
Explanation:
17.
What do you know about a chemical compound by looking at its chemical formula
Answer:
The number and the kinds of atoms in the compound
Explanation:
A chemical formula of a compound contains symbols o the atoms of the elements present in the compound as well as the number of atoms of each element in the form of subscripts.Therefore it helps us to know the elements in a compound and the number of atoms in the compounds.A sample of gas in a balloon has an initial temperature of 20. ∘C and a volume of 1.92×103 L . If the temperature changes to 68 ∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?
Answer:
[tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex]
Explanation:
The pressure is constant, so we can use Charles' Law.
[tex]\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}[/tex]
Data:
V₁ = 1.92 × 10³ L; T₁ = 20 °C
V₂ = ?; T₂ = 68 °C
Calculations:
(a) Convert temperatures to kelvins
T₁ = (20 + 273.15) K = 293.15 K
T₂ = (68 + 273.15) K = 341.15 K
(b) Calculate the volume
[tex]\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}[/tex]
The new volume of the gas is [tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex].
What did Ernest Rutherford’s gold foil experiment demonstrate about atoms ?
Answer:
Their positive charge is located in the small nucleus
Explanation:
Ernest Rutherford performed the gold foil experiment in 1911 where he used alpha particles generated from a radioactive source to bombard a thin gold foil.
In his experiment, he observed that the bulk of the alpha particles passed through the gold foil, just a tiny fraction was deflected back. To explain his findings, Rutherford proposed that an atom is made of positively charged centre where nearly all the mass is concentrated called nucleus. Surrounding the nucleus is a large space containing electrons.
He discovered that other than the nucleus at the center, atoms are mostly just empty space. So A makes the most sense.
In your own words describe the process of a physical change
Answer:
Explanation:
The changes that matter undergoes are associated with properties.
A physical change is one that alters the physical properties of matter. The physical properties of matter tells us everything about what a substance is when no change is occurring to its constituents. Such properties can be observed with our senses or instruments or pieces of apparatus. Examples are state of matter, colour, odour, taste, texture etc.
In many ways, physical changes are easily reversible and required little energy to initiate. There is no change in mass and no new kinds of matter are produced.
Examples of physical changes are boiling, melting, freezing, condensation, sublimation, magnetization of metals, breaking of glass, cutting of wood.
Select all that apply. The density of an object is 0.950 g/cm3. It will float in which of the following materials? water, density = 1.00 g/cm3 olive oil, density = 0.920 g/cm3 ethyl alcohol, density = 0.789 g/cm3 citric acid, density = 1.660 g/cm3
Answer:
The object will float in water and citric acid.
Explanation:
The density of an object indicates if the object will sink or float in another substance:The object will float, if it is less dense than the substance it is placed in.
The object will sink, if it is more dense than the substance it is placed in.
The object has density of (0.95 g/cm³) is less dense than water (density = 1.00 g/cm³) and citric acid (density = 1.660 g/cm³), so it will float in water and citric acid.The object has density of (0.95 g/cm³) is more dense than olive oil (density = 0.920 g/cm³) and ethyl alcohol (density = 0.789 g/cm³), so it will sink in olive oil and ethyl alcohol.So, the object will float in water and citric acid.
Latoya performs an experiment using the lab equipment shown. Which two properties is Latoya most likely measuring?
Answer: Volume and temperature
Explanation:
Answer:
volume and temperature
Explanation:
1. What is the specific heat of a substance that absorbs 2500 joules of heat when a sample of 100
g of the substance increases in temperature from 10 °C to 70°C?
Answer:
0.4167 J/°C.g.
Explanation:
To solve this problem, we can use the relation:Q = m.c.ΔT,
where, Q is the amount of heat absorbed by substance (Q = 2500 J).
m is the mass of the substance (m = 100 g).
c is the specific heat of the substance (c = ??? J/°C.g).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 70°C - 10°C = 60°C).
∵ Q = m.c.ΔT
∴ c = Q/(m.ΔT) = (2500 J)/(100 g)(60°C) = 0.4167 J/°C.g.
The study of the chemical and bond is called chemistry. According to the law of thermodynamics, the heat transfer from the high temperature to the low temperature.
The correct answer to the question is 0.4167.
What is specific heat?The specific heat capacity of a substance is the heat capacity of a sample of the substance divided by the mass of the sample. Specific heat is also sometimes referred to as mass heat capacity.
To solve this problem, we can use the relation:
Q = m.c.ΔT,
where,
Q is the amount of heat absorbed by a substance (Q = 2500 J).M is the mass of the substance (m = 100 g).C is the specific heat of the substance (c = ??? J/°C.g).ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 70°C - 10°C = 60°C).Q = m.c.T
After the equation, we can get.
c = [tex]\frac{Q}{(m.T)} = \frac{(2500 J)}{(100 g)(60C)}\\ \\ = 0.4167[/tex]
Hence, the correct answer is 0.4167.
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Plz Help! If 0.0025 mol NaNO3 forms during the reaction, what is the concentration of NaNO3 in the final solution?
Please give a step-by-step solution to this problem.
Answer:
Hi! I hope this will help
you with your question, whether this is an assignment or not. The answer that I
get is 0.033 concentration.
If 0.0025 mol NaNo3 forms
during the reaction, the concentration of NaNO3 in the final solution should be
0.033.
The concentration of NaNO₃ in the final solution, considering the sum of the given volumes, is approximately 0.276 M.
To find the concentration of NaNO₃ in the final solution, we need to know the volume of the solution. However, since it's not provided in the question or the additional information, we'll assume that the final volume of the solution is the sum of the volumes given in the reference information (0.2L from Na+ and 50mL + 40mL for NO₃).
Step 1: Convert mL to Liters for NO₃ since the concentrations are in Molarity (moles/liter). Therefore, the total volume in liters is 0.2L + 0.05L + 0.04L = 0.29L.
Step 2: We know from the information given that 0.08 mol of NaNO3 is produced. Since this is less than the stated 0.0025 mol, we will use 0.08 mol as the correct value.
Step 3: Calculate the concentration in moles/Liter (Molarity) using the formula C = n/V, where 'C' is concentration, 'n' is the number of moles, and 'V' is the volume in liters. This gives us C = 0.08 mol / 0.29 L = approx 0.276 M NaNO₃.
The concentration of NaNO₃ in the final solution is approximately 0.276 M.
The amount of heat involved in the synthesis of 1 mole of a compound from its elements, with all substances in their standard states at 25°C, is called _____.
A) standard heat of formation
B) heat of solidification
C) enthalpy
D) heat of reaction
Answer:
A
Explanation:
Answer:
A) standard heat of formation
Explanation:
how much ammonium chloride is needed to saturate 100 grams of water at 60 degrees Celsius
Answer:
55.3 g / 100.0 g of water.
Explanation:
From the solubility curve determine the solubility of ammonium chloride in g/100 g of water at 60°C.The theoretical value is 55.3 g.
How are the colors in neon signs changed?
Answer:
Neon lights don't actually change colors.
Explanation:
Neon signs give the illusion of changing color by turning different components of the signs on or off.
Answer:
The color of the light depends on the gas in the tube. Neon lights were named for neon, a noble gas which gives off a popular orange light, but other gases and chemicals are used to produce other colors, such as hydrogen (red), helium (yellow), carbon dioxide (white), and mercury (blue).
Explanation:
those are all the color signs i know this because i did it before
Finding the pH for [H+] = 9.4 * 10-3 M?
Answer:
pH = 2.0
Explanation:
To find the pH of a solution, take the -log[H+]. In this case, the -log(9.4 x 10^-3) equals 2.02687 which makes 2.0 when accounting for significant figures.
which of the following statements about natural resources is correct
solar power produces harmful chemicals
geothermal power requires more land than other power plants
nuclear power produces small amounts of energy from large masses
wind power requires a lot of space and depends on local weather patterns
Answer:
The right choice is "wind power requires a lot of space and depends on local weather patterns "
Explanation:
solar power produces harmful chemicals it is incorrect because solar power doesn't produce any chemicals2. geothermal power requires more land than other power plants
it is incorrect because geothermal power requires digging a stable 5 km-deep shaft not a land3. nuclear power produces small amounts of energy from large masses
it is incorrect because nuclear power produces large amounts of energy from small masses.So the right choice is "wind power requires a lot of space and depends on local weather patterns "
Can someone help me with Geography connection plz.
Hello There!
South of the equator, some crops grown were beans, cotton, peanuts, peppers, potatoes, coffee, millet and yams
Among the four ecosystems, is the most diverse. In the second ecosystem, there are 4 species of producers, 8 primary consumers, 10 secondary consumers, and 10 tertiary consumers. If the number of species of primary consumers in the second ecosystem increases to 20, there will be .
Species will be four secondary and tertiary consumers will be 25
Explanation-
Given in the question the number of species is 4 then it will have 8 primary 10 secondary and 10 tertiary consumers. If this number of primary consumers increases from 8 to 20 consumers then the number of species involved would be 10 { 4x20/8 }
Number of secondary consumers would also be increased and increased value would be 25 { 10x20/8 } then again comes the tertiary number of consumer which also increases. The number of tertiary consumers will increase to 25 { 10x20/8} same as secondary.
Among the four ecosystems, ecosytem 3 is the most diverse. In the second ecosystem, there are 4 species of producers, 8 primary consumers, 10 secondary consumers, and 10 tertiary consumers. If the number of species of primary consumers in the second ecosystem increases to 20, there will be fewer producers in the ecosystem.
Which of these is not an environmental effect of deforestation? overcrowding flooding smog soil erosion
Answer:
Soil
Explanation:
Overcrowding is not considered as environmental effect of deforestation.
Explanation:Trees provide various advantages to the living beings. It acts as shelter to animal, birds and human beings. It provides various raw materials for the industry. Apart from this it checks the flooding, prevents soil erosion and protects the environment from smog formation.
Deforestation refers to the process in which many trees are uprooted and destroyed. When trees are harmed it leads to stoppage of advantage caused by them. Overcrowding is not considered as environmental effect of deforestation as it has no relationship with deforestation.
A toaster transforms electrical energy into _____ energy and _____ energy. A. heat; light B. heat; kinetic C. heat; potential D. kinetic; potential
A. heat; light energies
Answer:
the answer is A; firstly heat then heat light.
A scientist has three liquids in a beaker. Liquid 1 is the top layer, liquid 2 is the middle layer, and liquid 3 is the bottom layer. Write the order of the liquids from most dense to least dense.
Answer:
3>2>1
Explanation:
Liquid 3 is the densest and liquid 1 is the least dense of all. Liquid 2 would be in the middle as its density lies between that of liquids 1 and 3.
Density can be defined as the mass per unit volume of a liquid.
The more the mass the greater the density. Density increases with increasing mass of solute. We see that density shares a direct proportionality with mass.
In terms of volume, the more the volume of solvents the lesser the density. When we dilute some solutions, we tend to reduce their density. Density shares an inverse relationship with volume.
The densest solutions would go below while the least dense goes up.
convert 6.35 grams of aluminum sulfate to moles
Answer:
There are 0.0186 moles of formula units in 6.35 grams of aluminum sulfate [tex]\rm Al_2(SO_4)_3[/tex].
Explanation:
What's the empirical formula of aluminum sulfate?
Sulfate is an anion with a charge of -2 per ion. When sulfate ions are bonded to metals, the compound is likely ionic.
Aluminum is a group III metal. Its ions tend to carry a charge of +3 per ion.
The empirical formula of an ionic compound shall balance the charge on ions with as few ions as possible.
The least common multiple of 2 and 3 is 6. That is:
Three sulfate ions [tex]\rm {SO_4}^{2-}[/tex] will give a charge of -6. Two aluminum ions [tex]\rm Al^{3+}[/tex] will give a charge of +6.Pairing three [tex]\rm {SO_4}^{2-}[/tex] ions with two [tex]\rm Al^{3+}[/tex] will balance the charge. Hence the empirical formula: [tex]\rm Al_2(SO_4)_3[/tex].
What's the mass of one mole of aluminum sulfate? In other words, what's the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]?
Refer to a modern periodic table for relative atomic mass data:
Al: 26.982;S: 32.06;O: 15.999.There are
two Al, three S, andtwelve Oin one formula unit of [tex]\rm Al_2(SO_4)_3[/tex].
Hence the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]:
[tex]\underbrace{2\times 26.982}_{\rm Al} + \underbrace{3\times 32.06}_{\rm S} + \underbrace{12\times 15.999}_{\rm O} = \rm 342.132\;g\cdot mol^{-1}[/tex].
How many moles of formula units in 6.35 grams of [tex]\rm Al_2(SO_4)_3[/tex]?
[tex]\displaystyle n = \frac{m}{M} = \rm \frac{6.35\;g}{342.132\;g\cdot mol^{-1}} = 0.0186\;mol[/tex].
The Mole #2
Avogadro's Number
PLEASE HELP ASAP! due tmr will give brainliest!
The solution is here,
given mass of copper wire(m)=25 g
no. of moles in given mass of Cu=0.393
a) no. of atoms= no. of moles×avogardo's number
=0.393×6.023×10^23=2.36 ×10^23 atoms
b) 25 g of Cu wire has 0.393 moles
so 200 g of Cu wire has 0.393/25 × 200=3.144 mol.
no. of atoms= 3.144×2.023×10^23=1.89×10^24 atoms.
c) 25 g of Cu wire has 2.36×10^23 atoms
so 5 g of Cu wire has (2.36×10^23)/25 × 5
=4.72×10^22 atoms
( b can also be solve like c)
what are crystalline solids
Answer:
A solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.
Explanation:
Solids that have a regular and three-dimensional arrangement of constituent particles such as (atoms, molecules, or ions) are known as crystalline solids. A few examples of crystalline solids include sodium chloride, quartz, diamond, etc. There are four types of crystals:
ionic , metallic , covalent network,molecularIn crystalline solids, particles are arranged in a repeating pattern. They have a regular and ordered arrangement resulting in a definite shape.
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For a phase change, H = -44 kJ/mol and SO = -0.12 kJ/(K•mol). What are
G and the spontaneity of the phase change at 350 K?
Answer:
ΔG = - 2.0 kJ/mol and the reaction is spontaneous.
Explanation:
∵ ΔG = ΔH - TΔS,
ΔH = - 44.0 kJ/mol, T = 350.0 K, ΔS = - 0.12 kJ/K.mol.
∴ ΔG = ΔH - TΔS = (- 44.0 kJ/mol) - (350.0 K)(- 0.12 kJ/K.mol) = - 2.0 kJ/mol.
The sign of ΔG assigns the spontaneity of the reaction:
If ΔG is negative: the reaction is spontaneous.If ΔG = 0, the reaction is at equilibrium.If ΔG is positive: the reaction is non-spontaneous.∵ ΔG has a negative value, so the reaction is spontaneous.
So, the answer is:
ΔG = - 2.0 kJ/mol and the reaction is spontaneous.
what is the volume of 12.0 grams of oxygen gas at STP
Atomic mass:O = 15.99 grams/moles
Answer:
16.82 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 1.0 atm, STP conditions).
V is the volume of the gas in L (V = ??? L).
n is the no. of moles of the gas in mol (n = mass/molar mass = (12.0 g)/(15.99 g/mol) = 0.7505 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 0.0°C + 273 = 273.0 K, STP conditions).
∴ V = nRT/P = (0.7505 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 16.82 L.
Hey sample of helium occupies 235 mL at 788 tour and 25°C. If the sample is condensed into a 0.115 L flask what will be the new pressure assuming constant temperature?
The new pressure of helium gas assuming constant temperature is equal to 1610.26 Torr.
Given the following data:
Initial volume = 235 mLFinal volume = 0.115 LInitial pressure = 788 TorrTemperature = 25°C.Conversion:
Initial volume = 235 mL to L = [tex]\frac{235}{1000} = 0.235\;L[/tex]
To determine the new pressure assuming constant temperature, we would apply Boyle's law:
Mathematically, Boyle's law is given by the formula;
[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]
Where;
[tex]P_1[/tex] is the original (initial) pressure.[tex]P_2[/tex] is the final pressure.[tex]V_1[/tex] is the original (initial) volume.[tex]V_2[/tex] is the final volume.Substituting the given parameters into the formula, we have;
[tex]788\times 0.235 = P_2 \times 0.115\\\\185.18 = 0.115P_2\\\\P_2 = \frac{185.18}{0.115} \\\\P_2 =1610.26\; Torr[/tex]
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The new pressure assuming constant temperature would be 1610.43 torr.
Given values:
Initial volume (V₁) = 235 mL = 0.235 L ( converted to liters)Initial pressure (P₁) = 788 torrInitial temperature (T₁) = 25°C = 298 K (converted to Kelvin)Final volume (V₂) = 0.115 LTemperature remains constant (T₂ = T₁ = 298 K)Goal: Find the new pressure (P₂) in torr.
Ideal Gas Law:
We can use the ideal gas law, which states: P₁V₁ = P₂V₂Since the temperature remains constant, we can simplify the equation to: P₁V₁ = P₂V₂Rearrange to solve for P₂: P₂ = P₁V₁ / V₂Plug in the values: P₂ = (788 torr) × (0.235 L) / (0.115 L)Calculate P₂: P₂ ≈ 1610.43 torrTherefore, the new pressure assuming constant temperature would be 1610.43 torr.