Answer:
The correct answer is B. Give me Brainliest
Which property describes a mixture? select three options. it can be separated by physical methods. it has a single chemical composition. it can appear different from different sources. it cannot be described by a chemical symbol or formula. it cannot have more than one state of matter.
The property of mixture which describes a mixture are it can be separated by physical methods, it can appear different from different sources and it cannot be described by a chemical symbol or formula.
What are mixtures?Mixtures are the compounds which are formed by the addition or combination of one or two elements or compounds.
As in the mixtures many states of matters are present and it will be filtered by using various physical methods, and it is not chemically shown by single chemical symbol or formula. Mixtures are also of two types:
Homogeneous mixtures are those in which equal compositions all over the volume is present.Heterogeneous mixtures are those in which different composition all over the volume is present.Hence options (1), (3) and (4) are correct.
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NO LINKS PLEASE! Why does dye dropped into a cup of water eventually spread throughout the water?
A. The water has lattice vectors.
B. The water undergoes a phase transition.
C. The water particles and dye particles exhibit Brownian motion.
D. The water exerts pressure on the container.
Answer:
C
Explanation:
okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.
particles in a solid are in fixed positions, where they can only vibrate in those positions ( take a look at ice, or rather, a brick)liquids have very small or rather, no spaces between them, but they can slide or rub against each other, like people in a really tight crowd I guessgas particles have very large spaces between them and they move randomly. these exibit what's called brownian motion.since water particles (and all other liquid particles) have negligible spacings and limited movement, that allows the dye particles to move from a region of high concentration to that of a low concentration. the aim for this is for the mixture/solution to reach an equilibrium, that is the mixture must get to a point where all regions have the same concentration of the dye.you can refer to your coursebooks :)
correct where wrong please:)
what challenges arise when nuclear material is removed from a power plant?
Answer:
it destroy the surrounding area
Select all that apply.
Which items are properties of acids?
soapy
sour
sweet
sharp
possible burns
for 10 points
Answer:
Sour and Possible Burns
Explanation:
Bases are soapy, not acids.
All acids are sour to taste.
Neither bases nor acids are sweet.
Sharp is a physical trait for things such as knives, not acidic liquids.
Acids can cause burns if handled incorrectly.
At what minimal temperature is the following reaction, the reduction of magnetite by graphite to elemental iron, spontaneous?
Fe3O4(s)+2C(s,graphite)→2CO2(g)+3Fe(s)
The values of enthalpy change, entropy change and temperature all determine the spontenity of a reaction.
What is a sponteanous reaction?A sponteanous reaction is one which has the change in free energy as negative. We know that ΔG = ΔH - TΔS. The spontenity of a reaction depends on;
i. enthalpy change
ii. entropy change
iii. temperature
Since the values in the qestion are not given, the question is incomplete and we can not obtain a numerical value in order to decide the sponteanity of the reaction.
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The second-order rate constant for the decomposition of NO2 (to NO and O2) at 573 K is 0.54 M-1 s-1. Calculate the time for an initial NO2 concentration of 0.20 mol/L to decrease to a) one-half; b) one-sixteenth; c) one-ninth of its initial concentration.
The rate of second order reaction depends on the change in the concentration of the reactants.
Second order reaction:A second order reaction is one in which the rate of reaction depends on the concentration of reactants.
For a second order reaction;
1/[A] = kt + 1/[A]o
When concentration deceresases to one-half;
1/0.1 = 0.54t + 1/0.20
1/0.1 - 1/0.20 = 0.54t
10 - 5/0.54 = t
t = 9.3 s
When concentration deceresases to one-sixteenth;
1/0.0125 = 0.54t + 1/0.20
1/0.0125 - 1/0.20 = 0.54t
80 - 5 = 0.54t
t = 80 - 5/0.54
t = 149 s
When concentration deceresases to one-ninth;
1/0.022 = 0.54t + 1/0.20
1/0.022 - 1/0.20 = 0.54t
45 - 5 = 0.54t
t = 45 - 5/0.54
t = 74 s
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explain how stalacitites and stalagmites are formed
As the redeposited minerals build up after countless water drops, a stalactite is formed. If the water that drops to the floor of the cave still has some dissolved calcite in it, it can deposit more dissolved calcite there, forming a stalagmite. Speleothems form at varying rates as calcite crystals build up. They are formed from condensation inside a cave, dripping off the ceiling.
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chemistry question
label them
reactants, products,activation energy etc
In the illustration A would be the reactants and E would be the products. B would be the activation energy (Ea), C would be the potential energy of reactants, F would be the potential energy of products, and D would be the potential energy change.
Energy DiagramThe energy diagram shows the energy states of the components of reactions.
From the diagram, A being the reactant becomes E, the product. The minimum energy that A needs to overcome to arrive at the product (activation energy) is B.
The energy state of the reactant A before becoming the product is C while that of the product E is F. The difference in the energy state of A and E is D.
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Select the correct answer from the drop-down menu. a scientist digs up sample of arctic ice that is 458,000 years old. he takes it to his lab and finds that it contains 1.675 grams of krypton-81. if the half-life of krypton-81 is 229,000 years, how much krypton-81 was present when the ice first formed? use the formula n = n0 . the ice originally contained grams of krypton 81.
The original mass of krypton 81 that is present in the ice is 6.70 grams.
How do we calculate original mass?Original mass of any substance will be calculated as below for the decomposition reaction is:
N = N₀(1/2)ⁿ, where
N = remaining mass of krypton-81 = 1.675g
N₀ = original mass of krypton-81 = ?
n will be calculated as:
n = T/t, where
T = total time period = 458,000 years
t = half life time = 229,000 years
n = 458,000/229,000 = 2
Now putting all these values on the above equation, we get
N₀ = 1.675 / (1/2)²
N₀ = 6.70 g
Hence required mass is 6.70 g.
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which word help the reader understand the meaning of stratum in paragraoh 3.
Answer:
It should be D
Explanation:
Stratum is a layer of rock in the ground
What is the pressure in a 8.00 L tank with 50.5 grams of chlorine gas at 365 K?
The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.
What is pressure?Pressure can be defined as the force acting prpendicular per unit surface.
To calculate the pressure of chlorine gas, we use the formula below.
Formula:
PV = nRT.................. Equation 1Where:
P = PressureV = Volumen = number of moles of chlorine gasR = Molar gas constantT = TemperatureMake P the subject of the equation
P = nRT/V............ Equation 1From the question,
Given:
T = 365 KR = 0.0821 L.atm.K⁻¹.mol⁻¹V = 8 Ln = 50.5/(35.5×2) = 0.711 molesSubstitute these values into equation 2
P = (0.0821×365×0.711)/8P = 2.66 atmHence, The pressure in the 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.66 atm.
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04. a migrating bird can travel at a speed of 10m/s. how far it will travel in 20min at this speed?
Give your answer in meters (m) and in kilometers (km).
Answer:
12000m & 12km
Explanation:
covert 20mins into seconds.
20 x 60= 1200seconds
distance = speed x time
distance = 10 x 1200
distance = 12000m
1km=1000m
12000/1000= 12km
hope that helps :)
Translate the world equation in skeleton equation and balance them
(I) Hydrogen+chlorine= Hydrochloric acid
(II) potassium+chloride= potassium chloride+oxygen
Answer:
The balanced equation is: H2 (g) +Cl2 (g) →2HCl (g)
Explanation:
Balancing chemical equation refers to balancing the stoichiometric coefficients on the reactants and products side. This must be done as the chemical equation obeys the law of conservation of mass and momentum.
The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation. The Law of conservation of mass governs the balancing of a chemical equation.
Given chemical equation
The balanced chemical equation for the hydrogen + chlorine -> Hydrogen Chloride.
H2 + Cl2 → 2HCl
The equation is balanced as on the reactants side there are two hydrogens present and the same on the products side. For chlorine as well the same thing goes two chlorine atoms on the reactants side and two on the products side.
4. How does the sun release its heat?
Answer:
radiation i think
Explanation:
thts why the solar panels can maķe electricity
Write down the structural formula for the monomer from which
polyvinyl chloride is derived.
(2)
Give the name of the monomer.
Answer:
Vinyl chloride is an organochloride with the formula H2C=CHCl that is also called vinyl chloride monomer (VCM) or chloroethene. This colorless compound is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC).
Explanation:
Answer:
CH2=CHCl
Explanation:
Which type of bond forms when two or more atoms share electrons?.
Answer:
Covalent
Explanation:
Covalent is the sharing of electrons and Ionic is transferring of electrons.
Answer:
Covalent bonds
Explanation:
the interatomic linkage that results from the sharing of an electron pair between two atoms
Oxygen gas occupies a volume of 95 ml at 305 k. what volume will it occupy at 550 k?
The new volume of the oxgen gas as the temperature is increased is 171.3ml.
Given the data in the question;
Initial olume of oxygen gas; [tex]V_1 = 95ml = 0.095L[/tex]Intial temperature; [tex]T_1 = 305K[/tex]Final temperature; [tex]T_2 = 550K[/tex]Final volume of oxygen gas; [tex]V_2 = \ ?[/tex]Charles's lawCharles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
To determine the new volume of the oxgen gas as the temperature is increased, we substitute our given values into the expression above.
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}\\ \\ \frac{0.095L}{305K} = \frac{V_2}{550K}\\\\V_2 * 305K = 0.095L * 550K\\\\V_2 * 305K = 52.25LK\\\\V_2 = \frac{52.25LK}{305K} \\\\V_2 = 0.1713L\\\\V_2 = 171.3ml[/tex]
Therefore, the new volume of the oxgen gas as the temperature is increased is 171.3ml.
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Check all reasons why a book was used.
it increased pressure on the gas.
it supported additional weights.
it balanced the syringe.
We can confirm that for the experiments regarding Boyle's law, the book was used to increase pressure on the gas and add additional weight.
Why is the book used in these experiments?The book is used for the reasons described in options 1 and 2 of the question. The book supports additional weights on the container, meaning that through these added weights we can increase the pressure being applied to the gas and see how said pressure affects the volume of a gas.
Therefore, we can confirm that the book was used to increase pressure on the gas and add additional weight.
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Answer: A, B
Explanation: edge2023
A pure sample of a monoprotic acid is dissolved in water. the sample is titrated with sodium hydroxide solution. at the point where 20.0 ml of the naoh solution has been added, the ph is 4.15. the phenolphthalein endpoint of the titration is observed when 50.0 ml of naoh have been added. what is the pka of the acid
Answer:
21 22 23 24 25 26 27 28 29 30
Explanation:
1. Define the unit 'mole'
Answer:
Below
Explanation:
The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample
Explain why the available amount of water per person differs between countries
Answer:
because in the different countries it is distributed unevenly.
Explanation:
hope this helps
PLEASE HELP!!!! WILL MARK BRAINLIEST! A balloon is filled with 257.88 L of gas at STP. When the balloon is cooled to -20.5°C, and the pressure decreased to .40 atm, what will the volume of the balloon be?
Answer:
3.97 psi
Explanation:
The new pressure can be found by using the formula for Boyle's law which is
P1 V1 = P2 V2
What is another name for a Grasshopper?
Answer:
The scientific name of the grasshopper is Caelifera.
Explanation:
hope this helps.
Answer:
caelifera
Explanation:
that’s the scientific name >_<
In a redox reaction, which ion would you expect to be more easily reduced?.
Work out the specific heat capacity of each metal from the data given:
Gold- the temperature of 2.00g of gold is raised by 11.7°C when 3.00J of energy is supplied
Answer:
C) Solar Energy, i,e, Energy that comes from the sun
what is the Acid name for HArO3
The microscopes used today are just like the ones used by Leeuwenhoek and Hooke. True or false
Answer:
False
Explanation:
While we do know that A. Leeuwenhoek used a simple microscope that consisted of only 1 lens, Hooke used a compound microscope. Although, after trying a compound microscope, Hooke found out that it strained his eyes and continued to use a simple microscope for his Micrographia.
Thus, we can say that the (compound) microscopes used today are different than the (simple) microscope used by Hooke and Leeuwenhoek.
The chemical formula for water is what does the formula show about each element in the compound?.
This states that
1 molecule of water contains
2 hydrogens(H)1 Oxygen(O)And if we write the chemical reaction
2H_2+O_2—›2H_2OWill give brainliest
sorry i know this:
4. 2 methyl 2 heptene
What is the boiling point of water at standard atmospheric pressure?
Answer:
about 100 degrees Celsius
Explanation:
i dont cap