Answer: Mixtures can be physically separated but pure substances cannot be physically separated.
Explanation: Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography. A pure substance, any compound or element, can't be separated into different atoms by physical methods. Pure substances are compounds and elements (made up of the same atom or same molecule respectively), while mixtures are an assortment of different substances put together. Hope this helps ^-^.
Pure substances cannot be physically separated but mixtures can be physically separated. Therefore, option (4) is correct.
What are a mixture and pure substance?Pure substances such as elements cannot be created by chemical reactions and cannot be broken down into simple substances. They have only one type of atom in the entire composition.
A pure substance consists of two or more elements that are chemically combined and has a fixed composition such kind of pure substance is called a compound. Pure substances can not be physically separated such as gold, silver, copper, etc.
A mixture is formed when two or more different substances are only physically combined or mixed together. They are not formed by the chemical reaction so that a mixture can be separated physically into its original components.
A mixture cannot be formed from a single type of matter even a homogeneous mixture has two or more types of substances but the composition of the substance in the entire mixture is always the same.
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Which statements describe the fossil record? Check all that apply.
There is very little fossil evidence for the first 4 billion years of Earth.
There is very little fossil evidence for the last 600 million years of Earth.
Most of the fossil evidence is from the first 4 billion years of Earth.
Most of the fossil evidence is from the last 600 million years of Earth.
The fossil record is complete.
The fossil record is not complete.
Answer:
A D F
Explanation:
look at attachment if you don't believe me
What is the geometry for MgF2?
Answer:
espero poderte ayudar
Explanation:
Answer:
2FMg
Explanation:
MgF*2=2FMg
Describe the changes to the coastline pictured above. Look particularly at North and South Monomy Island.
Where is the picture?
A skateboard with a mass of 1.4 kg is accelerated with a force of 11.9 N.
Problem
If resisting forces are ignored, what is the acceleration of the skateboard?
A O 13.3 m/s2
BO 8.5 m/s2
CO 0.12 m/s2
D 16.66 m/s2
Submit Answer
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_______ store food or pigments ( I'm learning about cells)
3. All the deer in Horry County represent which of the following?
species
biome
population
community
Answer:
community
Explanation:
Answer:
The correct answer is population. I took the test and got it right.
How is water used in human living? Give at least five examples.
How many moles are present in 44.8 L of nitrogen gas (Na)?
Answer:
two moles
There are two moles.
Explanation:
Heat Shield Rock 5. How did Heat Shield Rock get its name?
Answer:
Heat Shield Rock is a basketball-sized iron-nickel meteorite found on the Meridiani Planum plain of Mars by the Mars rover Opportunity in January 2005.
Heat Shield Rock
How many liters of water is necessary to make a 1.14 M solution with 5.10 mol KNO3?
What will the formula of a diatomic element look like?
Answer:
or example, most samples of the elements hydrogen, oxygen, and nitrogen are composed of molecules that contain two atoms each (called diatomic molecules) and thus have the molecular formulas H2, O2, and N2, respectively. ... A molecule of sulfur is composed of eight sulfur atoms and is therefore written as S8.
6 Li + Zn3(PO4)2 ------- > 2 Li3PO4 + 3 Zn
If 48.6 g of zinc is made, how many moles of lithium phosphate are also made? _______ moles
Moles of Lithium phosphate : 0.495
Further explanationGiven
6 Li + Zn₃(PO₄)₂ ------- > 2 Li₃PO₄ + 3 Zn
Required
Moles of Lithium phosphate
Solution
moles of Zinc(Ar=65,38 g/mol) :
= mass : Ar
= 48.6 : 65.38
= 0.743
From equation, mol ratio of Zn : Li₃PO₄ = 3 : 2, so mol Li₃PO₄ :
= 2/3 x mol Zn
= 2/3 x 0.743
= 0.495
Brainliest for an answer!
2 As (s) + 6 NaOH (aq) → 2 Na3AsO3 (s) + 3 H2 (g)
If 34.0g of As react with excess NaOH at STP, what volume of H2 will be produced in liters?
If you can answer this question quickly, I will mark you brainliest, I'm stumped to be honest.
The volume of H₂ : = 15.2208 L
Further explanationGiven
Reaction
2 As (s) + 6 NaOH (aq) → 2 Na₃AsO₃ (s) + 3 H₂ (g)
34.0g of As
Required
The volume of H₂ at STP
Solution
mol As (Ar = 75 g/mol) :
= mass : Ar
= 34 g : 75 g/mol
= 0.453 mol
From the equation, mol ratio As : H₂ = 2 : 3, so mol H₂ :
=3/2 x mol As
=3/2 x 0.453
= 0.6795
At STP, 1 mol = 22.4 L, so :
= 0.6795 x 22.4 L
= 15.2208 L
What is the percent yield of this reaction if 22.o g of Mgl2 is produced by the reaction of 25.0 g of Mg with 25.0 g of l2?
% yield = 80.719
Further explanationGiven
22.0 g of Mgl₂
25.0 g of Mg
25.0 g of l₂
Required
The percent yield
Solution
Reaction
Mg + I₂⇒ MgI₂
mol Mg = 25 g : 24.305 g/mol = 1.029
mol I₂ = 25 g : 253.809 g/mol = 0.098
Limiting reactant = I₂
Excess reactant = Mg
mol MgI₂ based on I₂, so mol MgI₂ = 0.098
Mass MgI₂ (theoretical):
= mol x MW
= 0.098 x 278.114
= 27.255 g
% yield = (actual/theoretical) x 100%
% yield = (22 / 27.255) x 100%
% yield = 80.719
Which element is in the same period as Potassium (K) and in the same
group as Flourine (F)?
O A. Bromine (Br)
O B. Oxygen (O)
O C. Selenium (Se)
O D. Argon (Ar)
Answer:
A. Bromine (Br)
Explanation:
what is rusting of iron?
Answer:
Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Unlike rust, which can flake off the surface of iron and steel objects, the layer of aluminium oxide does not flake off.
Explanation:
What is the name of Na3N?
HELP PLEASEEEE !!!!
Answer:
the answer I's the first one
How many significant figures are in the value 0.00250 m?
Answer:
3 significant figures
Explanation:
Significant figures:
1) The given measurement have four significant figures 1234.
2) All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
3) Zero between the non zero digits are consider significant like 104 consist of three significant figures.
4) Leading zeros are not consider as a significant figures. e.g. 0.07 in this number only one significant figure present which is 7.
5) The zeros at the right side e.g 2600 are also significant. There are four significant figures are present.
In given measurement (0.00250 m) number of significant figures are 3.
2,5 and 0
True or false for these!!!! Please help
Explain what happens to the particles in a substance during a physical change.
Answer:
Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas.
Explanation:
in physical changes no new materials are formed and the particles do not change apart from gaining or losing energy
What is the smallest representative particle of an element?
Answer:
atom
Explanation:
The smallest representative particle of an element is an atom.
What are atomsAtoms are the fundamental building blocks of matter and the smallest unit of an element that retains the chemical properties of that element. Each atom consists of a nucleus at the center, composed of positively charged protons and neutral neutrons, surrounded by a cloud of negatively charged electrons.
Atoms combine to form molecules or ions through chemical reactions, but they themselves represent the basic structure and identity of an element. Each element has a unique number of protons in its nucleus, known as its atomic number, which determines its position on the periodic table and its distinct chemical properties.
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Humans have developed ways to increase the of their
environment. true or false
Answer:
True......................had to do this because we need atleast 20 letters
The ____________________ two objects are from each other, the _____________ the force of gravity between them. fill in spaces
Answer:
Farther, lesser
Explanation:
The farther the two objects are from each other, the lesser the force of gravity between them.
The force of gravitational attraction between two bodies is inversely proportional to the distance between them.
This premised on the Newton's law of universal gravitation which states that "the gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distances between them".
So, the farther the distance, the lesser the gravitational attraction and vice versa.
what will happen an unboiled egg is placed in the beaker of fresh water and salt water
Answer:
Explanation:
1
Help me on both of those questions please
Answer:
Hey mate.....
This is your answer....
Explanation:
1. Evaporation
2. Liquid to solid
hope it helps you,
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Please I need help I can’t fail
Identify processes that change matter to a liquid state
Determine the final temperature of sample with a specific heat of 1.1 J/g°C and a mass of 385 g if it starts out at a temperature of 19.5°C and 885 J of energy are added to it.
Answer:
T2 =21.52°C
Explanation:
Given data:
Specific heat capacity of sample = 1.1 J/g.°C
Mass of sample = 385 g
Initial temperature = 19.5°C
Heat absorbed = 885 J
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = Final temperature - initial temperature
885J = 385 g× 1.1 J/g.°C×(T2 - 19.5°C )
885 J = 423.5 J/°C× (T2 - 19.5°C )
885 J / 423.5 J/°C = (T2 - 19.5°C )
2.02°C = (T2 - 19.5°C )
T2 = 2.02°C + 19.5°C
T2 =21.52°C
Calculate the mass of hydrochloric acid needed to react with 15.8 moles of zinc.
HCl + Zn -> H2 + ZnCl2
Answer:
240.1428
Explanation:
I hope this helps! :<
Hi! I produce proteins inside the cell. What am I?
Answer:
ribosome is the cell
Explanation:
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