Answer:
5 moles of oxygen occupy 120 dm³ volume.
Explanation:
Given data:
Number of moles = 5 mol
Volume of gas = ?
Solution:
In question it is given gas is at room temperature and pressure.
One mole of any gas at room room temperature and pressure occupy volume of 24 dm³. Thus,
5 mole of gas occupy volume of,
5 mol × 24 dm³/1 mol
120 dm³
5 moles of oxygen occupy 120 dm³ volume.
Students measuring the mass of a metal block record 2.985 g, 3.051 g, 3.102
g, and 3.211 g. Which other measurement of the block's mass would be most
precise?
A. 2.804 g
B. 3.1159
C. 3.418 g
D. 3.509 g
Answer:C - 3.115 g
Explanation:Correct
According to the pattern of carbon and hydrogen atom, if a molecule has five carbon atom, how many hydrogen atom does it have
Answer:
carbon and hydrogen are elements and methane is a compound.
Explanation:
bc
Which term represent a phase change ?
Burning
Melting
Expanding
Cutting
Which contribution to the development of atomic theory was the most impactful?
Answer:
Who contributed the most to the atomic theory?
After Democritus' discovery, new evidence would be found that would eventually lead to the modern atomic theory. John Dalton, J.J. Thompson, Ernest Rutherford, Niels Bohr, James Chadwick and Ernest Schrodinger each contributed greatly to the modern atomic theory by finding the actual evidence.
Explanation:
An Oxygen Tank has a pressure of 1200. 0 Kpa at 283k. What will the pressure be if the temp. is increased to 378 K?
Answer: (P2/P1)=(T2/T1)
(P2/1200.0kPa)=(387/283)
P2=(387K/283K) * (1200kPa)
P2= 1641kPa
Explanation:
An Oxygen Tank has a pressure of 1200 Kpa at 283K and when temp. is increased to 378 K then pressure will be 1,602.82 kpa.
How do we calculate the pressure?From the ideal gas equation it is clear that pressure of gas is directly proportional to the temperature, and for this question required equation will be:
P₁/T₁ = P₂/T₂, where
P₁ = initial pressure of oxygen tank = 1200 kpa
T₁ = initial temperature of oxygen tank = 283 K
P₂ = final pressure of oxygen tank = ?
T₂ = final temperature of oxygen tank = 378 K
On putting values, we get
P₂ = (1200)(378) / (283) = 1,602.82 kpa
Hence resultant pressure of the oxygen tank is 1,602.82 kpa.
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Which of these describes a physical change? Choose the correct answer. You may only choose one.
A. Wood logs are burned in a fire.
B. Coconut oil begins to crystallize after being placed in a freezer.
C. Milk left out of the refrigerator for a week starts to smell different.
D. Sodium hydroxide and hydrochloride acid are mixed in water to form a salt.
Answer:
A. Wood logs are burned in a fire
Explanation:
To solve this, we must know each and every concept behind physical change and Chemical change. Therefore, thee correct option is option A that is wood logs are burned in a fire.
What is physical change?A physical change is characterized by a differences in physical attributes. Melting, transformation to a gas, changes in strength, change in durability, changes in crystal structure, texturing change, shape, color, volume, and density are all examples of physical qualities. Tempering steel to make a knife blade is an instance of a physical change.
Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
Therefore, thee correct option is option A that is wood logs are burned in a fire.
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What happens when lime water is mixed with HCL. write with the balanced equations
Answer:
Gas Evolving Reactions
Explanation:
In this reaction setup, lime water is poured into one of the test tubes and sealed with a stopper. A small amount of hydrochloric acid is carefully poured into the remaining test tube. ... As a result of the acid-carbonate reaction, carbon dioxide is produced and the lime water turns milky.
CaCO
3(s)
+2HCl
(aq)
→2NaCl
(aq)
+H
2
O
(l)
+CO
2(g)
The process of generating electricity from dams and nuclear power plants is very different, but some of the energy transformations are the same. Which energy transformations occur in both dams and nuclear power plants? Check all that apply.
Answer:
Kinetic energy to mechanical energy, and mechanical energy to electrical energy.
Explanation:
From the Law of conservation of Energy, which state that energy can neither be created nor destroyed but can be transformed from one form to another. Energy transformation is essential in science and technology, in the process of generating electricity from dams and nuclear power plants
some of the energy transformations are the same, the energy transformations occur in both dams and nuclear power plants is Kinetic energy to mechanical energy, and mechanical energy to electrical energy. Kinectic energy is the energy in motion which means the dams is a running water and posses a Kinectic energy then it's is been convert to mechanical energy (which is the macroscopic energy) then to electrical energy by producing light.
Answer:
Explanation:
Kinetic energy to mechanical and mechanical to electrical
Water particles are composed of Helium and Nitrogen
Answer:
No, Water Particles are composed of 3 Atoms.
2 hydrogen atoms, and 1 oxygen atom
The first step in deforestation in the Amazon is _______.
a.
logging
b.
farming
c.
ranching
d.
road building
Please select the best answer from the choices provided
Answer:
A) Logging
Explanation:
You have to remove the trees before you can do anything with the land.
The first step in deforestation in the Amazon is logging. Therefore, option A is correct.
What is deforestation ?The term deforestation is defined as the purposeful clearing of forested land. Deforestation has greatly altered landscapes around the world. Deforestation can involve transformation of forest land to farms, ranches, or urban use.
The greenhouse gas emissions are a factor in global warming, altered weather and water patterns, and a rise in the frequency of extreme weather occurrences.
The Amazon rainforest is currently emitting more carbon dioxide than it is absorbing due to deforestation, which is the process of removing forest for purposes such as logging, mining, infrastructure, or urban development.
Thus, option A is correct.
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Describe some of the dangers of Global warming.
Answer:
Increased Heat, Drought, and Insect outbreaks.
Explanation:
Increased heat, drought and insect outbreaks, all linked to climate change, have increased wildfires. Declining water supplies, reduced agricultural yields, health impacts in cities due to heat, and flooding and erosion in coastal areas are additional concerns.
How many molecules are there in 5H20?
A.5
B.7
C.10
D.11
Answer:
the answers B which is 7
PLEASE HELP i’m struggling
Answer:
just stop struggling lol
Explanation:
PLZZZZ HELP Me plzzz
Answer:
I believe it is the second option b.
Explanation:
What is the complete ionic equation for
NaOH(aq) + HCl(aq) → H2O(1) + NaCl(aq)
Answer:
OH⁻ (aq) + H⁺ (aq) → H₂O (l)
General Formulas and Concepts:
Chemistry
Reaction PredictionStates of MatterSolubility RulesExplanation:
Step 1: RxN
NaOH (aq) + HCl (aq) → H₂O (l) + NaCl (aq)
Step 2: Balance RxN
Reaction is already balanced.
Step 3: Ionic Equations
Total Ionic Equation:
Break up the aqueous solutions into individual ions.
Na⁺ (aq) + OH⁻ (aq) + H⁺ (aq) + Cl⁻ (aq) → H₂O (l) + Na⁺ (aq) + Cl⁻ (aq)
Net Ionic Equation:
Remove spectator ions.
OH⁻ (aq) + H⁺ (aq) → H₂O (l)
The complete ionic equation for the reaction is:
Na⁺(aq) + OH⁻(aq) + H⁺(aq) + Cl⁻(aq) → H₂O(1) + Na⁺(aq) + Cl⁻(aq)
To write the complete ionic equation for the given chemical reaction, we need to break down all the reactants and products into their respective ions (if they are ionic compounds) or molecules (if they are covalent compounds) when they are in an aqueous solution.
The given chemical equation is:
NaOH(aq) + HCl(aq) → H₂O(1) + NaCl(aq)
In this reaction, both NaOH and HCl are strong electrolytes, which means they fully dissociate into ions when dissolved in water.
Therefore, the complete ionic equation for the reaction is:
Na⁺(aq) + OH⁻(aq) + H⁺(aq) + Cl⁻(aq) → H₂O(1) + Na⁺(aq) + Cl⁻(aq)
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Help ASAP I’ll mark you as brainlister be honest please don’t put random stuff
Answer:
Charge of a transition metal
Explanation:
Which element does this atom represent?
= proton
key: O-neutron
= electron
sodium
ОООО
oxygen
α. ο σ
potassium
neon
Answer:
fluorine
Explanation:
SANA MAKATULONG
how did henry moseley arrange his attempt at the Periodic Table?
Answer:
When Moseley arranged the elements in the periodic table by their number of protons rather than their atomic weights, the flaws in the periodic table that had been making scientists uncomfortable for decades simply disappeared.
Explanation:
Make sure to edit so you don't get copy-writed
Calculate the energy of a photon with a frequency of 9.78 x 1021 Hz.
Answer:
9.98538 kilohertz
Explanation:
젠장젠장
Which of the following has the ability to turn light energy into chemical energy? A. a generator B. a tree C. water D. an automobile
Answer:
B, trees, they use photosynthesis to do so.
Answer: B
Explanation:
How much heat would be released if 300 g of water cooled from 85°C to 25°C
Answer:
75240J
Explanation:
Given parameters:
Mass of water = 300g
Initial temperature of the water = 85°C
Final temperature = 25°C
Unknown:
Amount of heat released = ?
Solution:
The amount of heat released in this cooling process can be calculated using the expression below;
H = m x c x (t₂ - t₁)
m is the mass
c is the specific heat capacity of water = 4.18J/g°C
t is the temperature
Insert the parameters and solve;
H = 300 x 4.18 x (25 - 85) = -75240J
The negative symbol denotes heat loss.
is a truck that stops at a station in the town velocity or seed or acceleration?
Answer: Technically 0 SPEED
Explanation: Velocity is movement with a direction, speed is movement in any direction and acceleration is increasing (or decreasing if you wanna get technical) speed with a direction. With that being said, you can still have a moving truck with 0 acceleration. And being stopped, there is no direction the truck is moving, making speed the mosy viable answer.
Answer:
The answer is speed.
Explanation:
It is speed because the truck is slowing down, not going faster like it would if it was accelerating.
[tex]\frac{distance}{time} = speed[/tex]
i'm not great at science, but I hope that helps.
How is the earth’s groundwater and surface water replenished? blank replenishes the earth’s groundwater and surface water.
Answer And Explanation: Both Groundwater and surface water are largely replenished by rain water.
Answer:
rain water i think :/
Explanation:
Hi. I need a comprehensive note on :
Types of Chemical Reaction .
Answer:
The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories.
Explanation:
no new substance is produced
physical or
chemical change
What happens to the electo positive
character of elements on moving from
top to bottom in a group
left to right in a period?
Answer:
From top to bottom electropositivity increases
Left to right it reduces
Explanation:
Electropositivity is also known as metallicity. It is a measure of the tendency of atoms of an element to lose electrons. It is closely related to the ionization energy and indeed the electronegativity.
The lower the ionization energy, the more electropositive a substance is. Across the period from left to right, electropositivity or metallicity decreases and from top to down a group, it increases.What is the formula for the compound dinitrogen pentoxide? A. N4O5 B. N5O4 C. N4O6 D. N5O2 E. N2O5
Answer:
N2O5
Explanation:
Dinitrogen pentoxide is the chemical compound with the formula N₂O₅, also known as nitrogen pentoxide or nitric anhydride. It is one of the binary nitrogen oxides, a family of compounds that only contain nitrogen and oxygen. It exists as colorless crystals that melt at 41 °C. Its boiling point is 47 °C, and sublimes slightly above room temperature, yielding a colorless gas.
The formula for the compound dinitrogen pentoxide is [tex]\rm N_2O_5[/tex]. The correct answer is option E.
Compound is a substance that is composed of one or more than two atoms and are bonded together through a chemical bond.
The formula for the compound dinitrogen pentoxide:
Prefix "di-" indicates that there are two nitrogen atoms in the compound, and the prefix "penta-" indicates that there are five oxygen atoms. The suffix "-ide" indicates that the compound is made up of two different elements, nitrogen and oxygen.
When we combine two nitrogen atoms and five oxygen atoms, we get the formula: [tex]\rm N_2O_5[/tex].
Therefore, option E. the formula for the compound dinitrogen pentoxide is [tex]\rm N_2O_5[/tex].
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(NH4)CrO7 correct name
Answer:
pubchem
Explanation:
i know i'm in college
but you can look it up
What’s the definition of renewable energy
Answer:
energy from a source that is not depleted when used, such as wind or solar power.
Explanation:
Explanation:
renewable energy is energy from a source that is not depleted when used such as wind or solar power.
Hope this helps :)
Suppose that there is an air sample and a water sample, each of the same mass and each with an initial temperature, Tinitial, of 0° C. Now, imagine that both the air and water are heated using sunlight. If the same total amount of energy is added to both samples, which sample will reach a higher temperature, Tfinal? The air or the water?
Answer:
The air will reach a higher final temperature because its specific heat is lower.
Explanation:
Answer:
The air will reach a higher final temperature because its specific heat is lower.
Explanation: right from PLATO so paraphrase a lil bit
