Answer:
Elements :)
Explanation:
Neon (Ne), being an element, is the substance that cannot be decomposed by chemical means from the given list. All other options are chemical compounds that can be decomposed into elements.
The question is about identifying a substance that cannot be decomposed by chemical means from a given list. Substances that cannot be chemically decomposed are known as elements, which are the most basic form of matter that cannot be broken down into simpler substances. Based on the options provided (Ne, N₂O, HF, H₂O), Neon (Ne) is an element and thus cannot be decomposed chemically into simpler substances.
The rest of the substances are chemical compounds: N₂O (nitrous oxide), HF (hydrogen fluoride), and H2O (water). These compounds can be decomposed into their elements by chemical reactions, such as hydrolysis or electrolysis for water. Therefore, the correct answer is Ne, which is an inert noble gas and an element that cannot be decomposed by chemical means. Option A
Math
Science
Social studies
They are different subjects
In science we study physical , chemical and biological things
In maths we study about data handling, algorithms etc
In social we study about political economical and historical things
Answer:
hey are different subjects
In science we study physical , chemical and biological things
In maths we study about data handling, algorithms etc
In social we study about political economical and historical things
Explanation:
19
An emission spectrum shows two distinct lines separated by a small gap. What does this reveal?
A)
the electron dissipated into two photons
the electron took two jumps to return to its ground state
the electron emitted two photons simultaneously during its jump
the electron underwent the transition between a higher and ground state
twice
Answer:
The electron took two jumps to return to its ground state.
Explanation:
If the electron is in nth state then it first goes to (n-1)th to 2nd state and emits one photon of this energy gap. Then, it goes to ground state and emits another photon of different energy. It can emit [tex]\left \{ {{n-1} \atop {2}} \right.[/tex] types of different photons. Fourth option is incorrect because in that case it emits one photon and absorbs one photon to go back to that state and also both photons are of same energy.
Based on Dalton's atomic theory, what do atoms consist of?
Compounds
Elements
Molecules
Particles
Answer:
Your answer would be particles
Explanation:
The atom consist of subatomic particles like electrons protons and neutrons.
The rate of reaction for a hypothetical reaction was found to be 0.62 mol/L*s at 6°C. What would be the rate at 46°C?
Answer:
9.92 mol/L*s
Explanation:
Given data:
Rate of reaction = 0.62 mol/L*s
Temperature = 6°C
Rate of reaction at 46°C = ?
Solution:
There are 10 increase in four time of given temperature.
6+10 = 16
16+ 10 = 26
26+10 = 36
36=10 = 46
According to thumb rule,
By doubling the reaction four time the rate will be,
0.62 mol/L*s ×2⁴
0.62 mol/L*s × 16
9.92 mol/L*s
Part A
What is the mass of the water?
Express your answer to two significant figures and include the appropriate units.
The question focuses on calculating the mass of water using its density and volume, requiring an understanding of physics concepts and the correct application of significant figures and units.
Explanation:The question provided involves calculating the mass of water based on its density and volume, which is a fundamental concept in physics. To determine the mass of water, you use the formula mass = density × volume. The density of water is given as 1.000 ×10³ kg/m³, and various examples of volume calculations are provided, illustrating different contexts in which this calculation might be applied.
One specific calculation detailed is m = (1.000 × 10³ kg/m³) (2.00 × 10³ m³) = 1.00 × 10¸ kg, demonstrating how to apply the density-volume relationship. Another example provided is using a volume of 2.00 × 10¹ m³, resulting in a mass of 2.00 × 10±² kg. These calculations emphasize the importance of properly applying significant figures and units in physics problems.
To whoever helps me thank you so much have a wonderful day!
Answer:
N and P
Explanation:
Anion:
When an atom gain the electrons anion is formed. The negative sign shows that atom gain electron because number of electron are greater than protons or we can say that negative charge becomes greater than positive charge.
Cation:
When atom lose electron cation is formed. The atom thus have positive charge because number of positive charge i.e protons are increased are greater than negative charge or electron.
In given problem N and phosphorus both can gain three electrons which means negative charge becomes greater that's why the extra electron gained by atoms are written as -3 and both form anion with charge -3.
while Al form cation with charge +3 Mg form cation with charge +2 and iodine and bromine both form anion with charge of -1.
an inflatable toy has a volume of 310 mL. when a child takes it aboard an airliner the atmospheric pressure is 0.995 atm. as the airliner climbs,the cabin pressure drops, the toy expands to a volume of 440 mL. what is the air pressure in the airplane
Answer:
P₂ = 0.7 atm.
Explanation:
Given data;
Initial Volume = 310 mL
Initial Pressure = 0.995 atm
Final volume = 440 mL
Final pressure = ?
Solution;
P₁V₁ = P₂V₂
P₂ = P₁V₁/V₂
P₂ = 0.995 atm . 310 mL / 440 mL
P₂ = 308.45 atm. mL /440 mL
P₂ = 0.7 atm.
What is the relationship between mass, volume, and density? When you change one of those values, why do the others change, too?
Density is the ratio of mass to volume. When one of these variables changes (mass or volume), density changes as well, due to them being directly or inversely proportional. Example: an inflated balloon floats because its volume increases (while mass stays constant), thus its density decreases.
Explanation:The relationship between mass, volume, and density is defined by the formula: density = mass/volume. This means that density is the ratio of mass to volume.
When you change one of these values (mass, volume or density), the others change too, because they are directly or inversely proportional. For example, if you increase the mass of an object while keeping the volume constant, its density will increase. Conversely, if you increase the volume of an object while keeping its mass constant, its density will decrease.
A good example can be found in balloon: when you inflate a balloon, its volume increases while its mass remains nearly constant, resulting in a decrease in its density. That's why the balloon floats in the air (the air around being denser than the balloon).
Learn more about Density here:https://brainly.com/question/34199020
#SPJ2
The temperature of a 268 mL sample of gas increases from 151. K to 353. K. What is the final volume of the sample of gas, if the pressure in the container is kept constant?
Answer:
V₂ = 626.52 mL
Explanation:
Given data:
Initial volume = 268 mL
Initial temperature = 151 K
Final temperature = 353 K
Final volume = ?
Solution:
V₁ / T₁ = V₂ / T₂
V₂ = V₁ T₂/ T₁
V₂ = 268 mL× 353 K / 151 K
V₂ = 94604 mL.K / 151 K
V₂ = 626.52 mL
Convert 325 milliliters to liters.
A:0.325 liters
B:3.25 liters
C:32.5 liters
D:325 liters
Answer:
The Awnser Is A. 0.325 Liters
Explanation:
If an element has 2+ valence electrons, does it transfer only one or more than one valence electrons
Answer:
element having 2+ valence electrons can transfer its more than one electron that is 2 electron completely.
Explanation:
Group IIA have 2+ valency and two electrons in its valance shell.Its Electropositivity is high and have the tendency to donate it two electrons.Element of IIA form ionic with most electronegative element.Examples:
Cu²⁺, Mg²⁺, Sr²⁺ are examples having 2+ valance electron
one of the following is examples of element that have 2+ valence electrons
MgCl₂
Atomic number of Magnesium (Mg) is 12
Electronic Configuration of Mg:
1s², 2s², 2p⁶, 3s²
or
K =2
L = 8
M = 2
So, it have to give its 2 electrons to form a stable compound.
Similarly
Chlorine atomic number is 17
Electronic Configuration of Chlorine:
1s², 2s², 2p⁶, 3s², 3p⁵
or
K =2
L = 8
M = 7
So, it have to gain one electrons to form a stable compound and complete its octet.
So,
Two chlorine atom as a molecule gain 2 electrons from Mg²⁺ atom
So one Mg²⁺ and 2 Cl⁻ atoms form an ionic bond
where in this ionic bond Mg²⁺ transfer its 2 valence electron completely and chlorine molecule accept 2 electrons.
Cl-----Mg------Cl
So the Answer is
element having 2+ valence electrons can transfer its more than one electron that is 2 electron completely.
What force is necessary to accelerates a 1250kg car at a rate of 40 m/s
Answer:
F = 50000 N
Explanation:
The acceleration is rate of change of velocity of an object with respect to time.
Formula:
a = Δv/Δt
a = acceleration
Δv = change in velocity
Δt = change in time
Units:
The unit of acceleration is m.s⁻².
Acceleration can also be determine through following formula,
F = m × a
a = F/m
Given data:
Mass of car = 1250 Kg
Acceleration = 40 m/s².
Force = ?
Solution:
F = m × a
F = 1250 Kg × 40 m/s²
Kg.m/s² = N
F = 50000 N
What makes the results of a scientific experiment accurate?
Group of answer choices
A) Having multiple trials
B) Lacking any supporting data
C) Working in a lab
D) Using a hypothesis that is always true
Answer:
A
Explanation:
That's the best answer out of all of them.
Answer:the answer is a it makes the most sense and i tried looking at all of it and a actually made the most sense but umm yea its a
2. If you had three unknowns which are starch, BaSO4, and MgO, how can you identify starch among them ?
Answer:
A chemical test for starch is to add iodine solution (yellow/brown) and look for a colour change. In the presence of starch, iodine turns a blue/black colour
Explanation:
There is a golden role of solubility, polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, to identify the starch solution, we need to do iodine test.
What is solution?Solutions are a homogeneous mixture of two or more substances. A solution is a homogeneous mixture of solvent and solute molecules. Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution. There are two types of mixture that is homogeneous and heterogeneous. Solution is a homogeneous solution.
To know which one is starch solution amongst BaSO[tex]_4[/tex] and MgO. Add iodine solution (yellow/brown) as a chemical test for starch and watch for a color change. The color of iodine changes to a blue/black color when starch is present.
Therefore, to identify the starch solution, we need to do iodine test.
To know more about solution, here:
https://brainly.com/question/13812915
#SPJ2
Write the reaction rate expressions for the
following reactions?
2H2+O2_____2H2O
Answer:
see attachment
Explanation:
Which of the following expressions is equivalent
to 7x + 9y - 6 - 3y + 4?
A 7x + 4y
B 11xy
C 7x + 6y - 2
D. 7X+4
Answer:
C
Explanation:
All that is needed to do is combine like terms. The sign in front of each term stays with it. Like +9y-3y=6y, 7x would isolate itself since it has not other term to follow. And -6+4=-2. This would all lead to C. 7x+6y-2.
The expression simplifies to 7x + 6y - 2 by combining like terms, making answer choice C the equivalent expression.
Explanation:The expression 7x + 9y - 6 - 3y + 4 can be simplified by combining like terms. First, combine the 'y' terms (9y - 3y) to get 6y. Then, combine the constant terms (-6 + 4) to get -2. After combining these terms, the expression simplifies to 7x + 6y - 2, which is answer choice C.
Answer these in order
Answer:
Explanation:
Pure Substance: are those having same type of atoms or molecules.
Compound: one or more atoms of the element combine to form a compound.
Mixture: is combination of one or more substances mix together.
Homogeneous Mixture: are those which are not distinguish by naked eye but can be separated into its components by physical means
Heterogeneous mixture: are those which can be distinguished by naked eye and can be separated into its components by physical means.
The complete detail of your answer in attachment
chemical formula for iron (l) selenide
Answer:
Iron can not form iron(i) selenide however it can form iron(ii) selenide.
Explanation:
The possible oxidation states of iron are +2 and +3.
Iron can form iron (ii) selenide.
The formula of iron (ii) selenide is FeSe.
In iron (ii) selenide the oxidation state of iron is +2.
The ratio of both atoms are 1:1.
Its molecular weight is 134.82 g/mol.
It is toxic compound.
Its melting point is 965°C.
Its density is 4.72 g/cm³.
Iron can also form iron (iii) selenide.
The formula of iron (iii) selenide is Fe₂Se₃.
In iron (iii) selenide the oxidation state of iron is +3.
The ration of both atoms are 2:3.
It also known as ferric selenide.
Its molecular weight is 348.57 g/mol.
How many moles are there in 50.5 atoms ba
8.386 × 10^-23 moles
Explanation:We are given;
Number of atoms of Ba is 50.5 atomsWe are required to determine the number of moles
We need to know that 1 mole of an element contains atoms equivalent to the Avogadro's number, 6.022 × 10^23.Therefore, 1 mole of an element contains 6.022 × 10^23 atomsIn this case;
1 mole of Ba contains 6.022 × 10^23 atoms
Number of moles = 50.5 atoms ÷ 6.022 × 10^23 atoms
= 8.386 × 10^-23 moles
The number of moles in 50.5 atoms of Ba is 8.386 × 10^-23 moles
5. Suppose the efficiency of illumination is defined as the
intensity of light absorbed by the plants divided by the
intensity of light provided to the plants. Based on the
data, would one be justified in concluding that the effi-
ciency of illumination was higher in Section 1 than in
the other sections?
A. Yes, because the illumination provided to the
plants was highest in Section 1.
B. Yes, because the amount of light not absorbed by
the plants was highest in Section 1.
C. No, because the amount of light absorbed by the
plants was lowest in Section 1.
D. No, because the information provided is insuffi-
cient to determine efficiency of illumination.
In addition to carbon dioxide, which of the following should Callie expect the seeds to give off as a waste product from performing cellular respiration?
Question options:
water
energy
oxygen
glucose
Answer:
The correct answer is water.
Explanation:
During cellular respiration glucose molecules undergo complete oxidation to from energy in form of adenosine mono phosphate or ATP and metabolic waste products in form of Carbon monoxide(CO2) and water(H2O).
According to the given question Callie expect seeds to give off water(H2O) as a waste product from performing cellular respiration.
Name a method that could be used to separate magnesium hydroxide from sea water
Answer:
Add limewater
Explanation:
Ca(OH)₂ is about 1000 times more soluble than Mg(OH)₂
If you add limewater to the seawater, the magnesium ions will precipitate out as magnesium hydroxide.
Mg²⁺(aq) + 2OH⁻(aq) ⟶ Mg(OH)₂(s)
EC - Activities
Bryanna
bl195552
Mastery Assess It_5 School Year > Week 18 > Day 87
Target due: 1/29/20
CALCULATOR
MATERIALS
1. A scientist counts 5.62 x 1024 molecules of NaCl. How many moles of NaCl are in the sample? Show your work in
space below.
8.16 moles
11.33 moles
9.33 moles
10.5 moles
9.33 units of NaCl
I did not say molecules because sodium chloride is not a molecule, it is an ionic compound.
Explanation:
To find the number of moles of NaCl we use the Avogadro's number to devise the following reasoning:
if 1 mole of NaCl contains 6.022 × 10²³ units of NaCl
then X mole of NaCl contains 5.62 × 10²⁴ units of NaCl
X = (1 × 5.62 × 10²⁴) / 6.022 × 10²³
X = 0.933 × 10
X = 9.33 units of NaCl
Learn more about:
Avogadro's number
https://brainly.com/question/1445383
#learnwithBrainly
Volume is decreased inside the compressor, causing an increase in pressure and
We want materials for the compressor that can withstand the high temperatures and pressures of refrigerants.
What is a compressor?The most popular of these is air, and compressors are mechanical devices that are used to raise pressure in a range of compressible fluids or gases.
A compressor is a mechanical device that lowers a gas's volume while raising its pressure.
One particular kind of gas compressor is an air compressor. Pumps and compressors have characteristics in that both raise the pressure on a fluid and can move it via a pipe.
The air is forced into the storage tank by the vacuum and out of the chamber. The compressor shuts off once the storage tank reaches its maximum air pressure. The duty cycle refers to this procedure.
Therefore, Volume is decreased inside the compressor, causing an increase in pressure and Temperature.
Learn more about compressor here:
https://brainly.com/question/9131351
#SPJ2
Please help me! I am offering 100 points and brainliest!
Write a few sentences summarizing how density is changed by changing the mass without changing the volume and by changing the volume of a substance without changing the mass (both by increasing and decreasing). If you prefer, you can use specific numbers and calculations to show the relationship instead.
Explanation:
Since density is calculated with mass divided by volume, changing either of these variables will affect the density, not necessarily both of them. If only the volume is increased or only the mass is decreased, the density will decrease. If only the volume is decreased or only the mass in increased, the density will increase.
Example:
Original density is 50g/ml. Mass is 50g and volume is 1ml.
Increase mass only:
mass = 100g
Density = 100g/ml <= Density is increased
Decrease mass only:
mass = 25g
Density = 25g/ml <= Density is decreased
Increase volume only:
volume = 2ml
Density = 50g/2ml = 25g/ml <= Density is decreased
Decrease volume:
volume = 0.5ml
Density = 50g/0.5ml = 100g/ml <= Density is increased
determine the mass in grams of 0.500 mol of uranium(molar mass =238.05g)
Answer:
238,02891 grams
Explanation:
1g/mole
The mass in grams of 0.500 mol of uranium whose molar mass is 238.05 g/mol is 119.025g.
What is the relation between mass and moles?Mass of any substance will be calculated by using their moles by using the below formula as:
n = W/M, where
W = required mass = ?
M = molar mass of uranium = 238.05g/mol
n = moles of uranium = 0.5 moles
On putting values we get
W = (0.5)(238.05) = 119.025g
Hence required mass of uranium is 119.025g.
To know more about moles to mass, visit the below link:
https://brainly.com/question/24631381
what is the easiest way to separate hydrogen and oxygen out of a water molecule?
A.) Boil the water until the chemical bonds break
B.) They cannot be separated by using physical properties
C.) Filter the water using charcoal to break the chemical bonds
D.) Use a magnet to pull out the metallic bonds
A red blood cell placed in distilled water will swell due to the diffusion of
Answer:
Osmosis
Explanation:
Particle in water move from low concentration to higher concentration in semi-permeable membrane. The particle of water would be less concentrated therefore the water would move into red blood cell therefore building in mass due to water and therefore swelling
A chocolate brownie had a volume of 640 cm³ and a mass of 480 g. Calculate its density!
Answer:
The density is : 0,75 g/cm3
Explanation:
We use the formula
density= mass/volume = 480 g/ 640cm3= 0, 75 g/cm3
what is a hypothesis in an experiment?
i’m doing homework on independent and dependent variables in science PLEASE HELP
Answer:
A hypothesis is an educated guess.
Answer:
The hypothesis is a educated guess that you take before starting an experiment.
Explanation:
If I do blank then blank will happen. If I drink water then I won't feel thirsty. It is something that makes you take a guess about what will happen.