Answer:
Physical changes
Explanation:
Changes in the state of matter are physical changes.
First, the material is made up of the same components that is was before it changed states.
The physical properties of the material changed, but its chemical composition did not, meaning that is is a physical change.
Answer:
Physical change
Explanation:
Matter can change between phases, so they are reversible physical changes that do not change matter’s chemical composition.
Changes of state are physical changes in matter. They are reversible changes that do not change matter’s chemical makeup or chemical properties. Water, for example, can be a solid (ice), a liquid (drinking water), or a gas (steam). Those are physical changes that don't change the fact that water is always chemically made up of H2O (two hydrogens and one oxygen).
What is the relationship between volume and pressure for a gas?
Answer:
There exists a relationship between pressure and volume through Boyle's Law. It states that when temperature is held constant in thermodynamic syatems, the volume increases as the pressure decreases (and is true the other way around).
Hope this helps :)
how does anodising of aluminium metal is done
Answer:
Anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish. ... Anodizing is accomplished by immersing the aluminum into an acid electrolyte bath and passing an electric current through the medium.
Answer:
Anodising is a process of forming a thick oxide layer of aluminium. Aluminium develops a thin oxide layer when exposed to air. This Aluminium oxide coat makes it resistant to further corrosion. The resistance can be improved further by making the oxide layer thicker. During anodising, a clean aluminium article is made the anode and is electrolysed with dilute sulphuric acid. The oxygen gas evolved at the anode reacts with aluminium to make a thicker protective oxide layer. This oxide layer can be dyed easily to give aluminium articles an attractive finish
help pls i need help and i’m tired i took 15 test today-
Answer:
3
Explanation:
Lithium's atomic number is 3. it has 3 protons in its model
Balance the equation : CH3COOH(aq) + NaHCO3(s) -> CO2(g) + H2O(l) + Na+(aq) + CH3COO-(aq) and provide an explanation
Answer:
Explanation:
CH₃COOH(aq) + NaHCO₃(s) -> CO₂(g) + H₂O(l) + Na+(aq) + CH₃COO-(aq)
The equation is already balanced .
In the reaction acetic acid reacts with sodium bicarbonate to produce carbon dioxide gas , water and sodium acetate . Sodium acetate will be in ionic form ie in the form of Na⁺ ( sodium ion ) and CH₃COO ⁻ ion ( acetate ion ) .
This is an acid base neutralisation reaction . one mole of acetic acid reacts with one mole of sodium bicarbonate to produce one mole of carbon dioxide gas , one mole of water and one mole of sodium acetate in ionic form .
The label on a soft drink bottle gives the volume in two units: 2.0 L and 67.6 fl oz. Use this information to derive a conversion factor between the English and metric units. How many significant figures can you justify in your conversion factor?
Answer:
Explanation:
The significant figures are determined by 2.0. It only has 2 places, so the answer to the last question is 2.
The English unit is 67.6 oz
The metric unit is 2 L
So there are 67.6 fl oz / 2 L = 33.8 fl oz / L
In other words 1 liter has 33.8 fl oz
But you only have 2 sig digs so the answer is actually 34 fl oz/L
what is acid, base, salt?
Answer:Acid ,Base ,Salt
Explanation: An acid is defined as a substance whose water solution tastes sour, turns blue litmus red and neutralizes bases
A substance is called base if its aqueous solution tastes bitter, turns red litmus blue or neutralizes acids.
Salt is a neutral substance whose aqueous solution does not affect litmus.
Hope it will help u....
The diagram below shows students set-up for the preparation and collection of oxygen gas
X
Oxygen gas
Sodium
peroxide
(a) Name substance X used
(b) Write an equation to show the reaction of sodium peroxide with the substance named in 1
Answer:
iodine sodium preocide
Explanation:
hang hsudb
Which molecule is largest? hydrogen carbon dioxide ammonia maltose
Answer:
maltose
Explanation:
If we intend to determine the largest molecule, then we must look at the relative molecular mass of each molecule because the larger the molar mass, the larger the molecule.
Hydrogen =2 gmol-1
Carbon dioxide = 44 gmol-1
Ammonia = 17 gmol-1
Maltose= 342.3 g/mol
Hence maltose is the largest molecule among the options.
A sample of liquid ammonia has a density of 0.7 g/mL. Find the mass of a 20 mL
sample of liquid ammonia. ***UNITS***
Answer:
Mass of liquid ammonia is 0.035g.
Explanation:
I hope this will help u
Have a nice day
Convert 550 Hm to mm
Answer:
55,000,000
Explanation:
550 hectometers [hm] = 55,000,000 millimeters [mm]
Dua buah gaya masing-masing F1 = 10 N dan F2 = 5 N bekerja pada sebuah benda yang:
a. usaha yang dilakukan terletak pada suatu permukaan lantai. Jika benda berpindah
ke kanan sejauh 5 meter, tentukan masing-masing gaya !
b. usaha yang dilakukan bersama-sama!
Pertanyaan ini tidak ditulis dengan benar.
Pertanyaan Lengkap:
Duah buah gaya masing masing F1=10N dan F2=5N bekerja pada sebuah benda yang terletak pada suatu permukaan lantai. Jika benda berpindah ke kanan sejauh 5 meter,usaha yang dilakukan pada benda oleh kedua gaya tersebut adalah
Answer:
75 Nm or 75 Joules
Explanation:
Dari pertanyaan tersebut, kami telah diberikan parameter berikut:
F1 = 10N
F2 = 5N
D = 5 Meter.
Kita diminta untuk mencari atau menghitung usaha yang dilakukan pada benda oleh dua gaya.
Rumus kerja yang dilakukan pada suatu benda dengan dua gaya =
W = (F1 + F2) × D
Dimana D = Perpindahan benda
W = (10N + 5N) × 5m
W = 15N × 5m
W = 75Nm atau 75Joules
Oleh karena itu, usaha yang dilakukan pada benda tersebut dengan dua gaya = 75Nm atau 75 Joules
The kinetic engery of molecules increase as you go from solid liquid gas true or false
What is the average yearly rate of change of carbon-14 during the first 5000 years?
Answer:
The average yearly rate of change of carbon-14 during the first 5000 years = 0.0004538 grams per year
Explanation:
Given that the mass of the carbon 14 at the start = 5 gram
At the end of 5,000 years we will have;
[tex]A = A_0 \times e^{-\lambda \times t}[/tex]
Where
A = The amount of carbon 14 left
A₀ = The starting amount of carbon 14
e = Constant = 2.71828
[tex]T_{1/2}[/tex] = The half life
[tex]\lambda = 0.693/T_{1/2}[/tex]
t = The time elapsed = 5000 years
λ = 0.693/[tex]T_{1/2}[/tex] = 0.693/5730 = 0.0001209424
Therefore;
A = 5 × e^(-0.0001209424×5000) = 2.7312 grams
Therefore, the amount of carbon 14 decayed in the 5000 years is the difference in mass between the starting amount and the amount left
The amount of carbon 14 decayed = 5 - 2.7312 = 2.2688 grams
The average yearly rate of change of carbon-14 during the first 5000 years is therefore;
2.2688 grams/(5000 years) = 0.0004538 grams per year
The average yearly rate of change of carbon-14 during the first 5000 years = 0.0004538 grams per year.
Which method of drawing hydrocarbons is the fastest to draw?
A. The structural model method
B. The Lewis structure method
C. The ball-and-stick method
D. The stick model method
Answer: The stick model method
Answer:
D. The stick model method
Explanation:
Write an equation that shows the formation of a strontium ion from a neutral strontium atom
Answer:
See explanation
Explanation:
Sr(s) + 2HCl(aq) -----> SrCl2(aq) + H2(g)
Ionically;
Sr(s) + 2Cl^-(aq) ----> SrCl2(aq)
If we look at the reaction above, strontium atom was dissolved in hydrochloric acid. The strontium atom is now oxidized by the acid to give Sr^2+ ion according to the equation shown above.
Explain which is the better coolant: water or methanol?
Answer:
Water
Explanation:
Because it has a higher specific heat capacity.
Water is a better coolant than methanol due to its high specific heat capacity.
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.
Methanol effective in preventing the coolant from freezing, its low boiling point and low specific heat capacity led to considerably less cooling than water alone. Also, the concentration of methanol would tend to be reduced over time due to its greater tendency to evaporate than the water with which it was mixed.
Learn more about Specific heat, here:
https://brainly.com/question/31608647
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. Name something chemistry related you are interested in or interested in learning about.
Answer: How The World Works
Explanation: Our world is made out of atoms, molecules and ions. Their behavior determines the properties of the substances we encounter in our daily lives: their structure, color, smell, and the way they interact with each other.
A tuna travels at a speed of 72 kilometers per hour. What is the speed of the tuna in meters per second?
Answer:
20 m/s
Explanation:
Scientific models are always correct
✅Models are approximations and omit details, but a good model will robustly output the quantities it was developed for. Models do not always predict the future. This does not make them unscientific, but it makes them a target for science skeptics. ... But correct predictions alone don't make for a good scientific model
IamSugarBee
1. What are the characteristics of scientific thinking and investigating? 2.Why is science literacy important? 3.What skills and tools do scientists use? 4.Why is the use of the inquiry process (or scientific method) a practical way to approach science? 5.Why are scientific theories modified, but seldom discarded? 6.How has science and technology influenced everyday life?
I WILL GIVE BRAINLIEST TO ANYONE WHO ANSWERS!!!!!!!!
Answer: kindly check explanation
Explanation:
Characteristics of scientific thinking and investivating:
1) Empiricism : Also called empirical evidence maybe classed as natural evidences used to butress or support a certain notion or fact usually attainable from experience or teaching.
11.) Rational : Rational thinking or attribute could simply be tagged as reasonable and do not negate laid down facts.
111.) Skepticism: This is very imperative in scientific research as it opens the way to further research enabling researchers to gather more evidences required to establish a strong argument.
2.) IMPORTANCE OF SCIENCE LITERACY
Science literacy simply empowers mankind. Nourishing researchers or literates with the knowledge of its natural environment and enabling them understand, explore and exploit resources in our environment.
3.) Skills and tools scientist need :
Skills :
1) Curiosity: The ability to frame and and ask questions is key to establishing a purpose for research. Asking the right questions is key in a scientific process.
11) Data gathering or collection: Obtaining the right data capable of proferring the essential solution to our research question is key to obtaining logical insight.
111) Communication: Once research is complete, it is essential that researchers possess the skills required in transmitting their conclusion in a way which is both simple, logical and sensible.
Tools include common laboratory equipments such as beaker, testube, measuring cylinders, microscope and so on.
4.) The scientific or inquiry method provides a stepwise, easy to understand and logical approach to problem solving, Hence, providing a lucid and evidence - based conclusion which is both practicable and reproducible.
5.) The main reason for the modification of scientific theories is that they are susceptible to further research or study. As a result of evolution and change in trend depending on various natural and environmental factors, modification may occur in the form of review without abrogating previously existing studies.
6.) Science and technology has enabled mankind to adjust and cope with the continuous evolutionary changes in our environment. Enabling us to use these findings to ease our everyday living standard.
what is the mass of this atom?
Answer:
[tex] \boxed{ \huge{ \boxed{ \sf{ \: 7}}}}[/tex]
Option C is the correct option
Explanation:
Proton = 3
Neutron = 4
To find : Atomic mass
Atomic mass is the total number of protons and neutrons present in an atom of an element.
So, Atomic mass = Proton + Neutron
= 3 + 4
= 7
Hope I helped!
Best regards! :D
a sample of an unknown liquid has a volume of 24.0 mL and a mass of 6 g.what is its density?
Answer:
Density=mass / volume.
Density=6×24=144g/cm^3.
Answer:
0.25 g/mL
Explanation:
Density = mass/volume
Volume = 24.0 mL
Mass = 6 grams
Density = 6 grams/24.0 mL
Density = 0.25 grams/mL
What is an isotope?
о
an atom that has gained electrons
O
an atom that has lost electrons
O
two or more forms of an atom that contain different numbers of neutrons
O
two or more forms of an atom that contain different numbers of protons
Answer:The answer is C:two or more forms of an atom that contain different numbers of neutrons. An isotope is when there are different forms of an atom, in terms of neutrons. Not to be confused with cations or anions, which are atoms with a difference of electrons or protons, making them charged.
Explanation: I took chemistry in 6th grade.
An organic chemistry student is experimentally determining the
melting point of fluorenone. The experimental melting points are
listed below from a to e. Which one should he discard so that he
can say his data is precise?
a 83.5 °C
b 85.6 °C
C 83.6 °C
d 83.4 °C
e 83.3 °C
Answer:
85.6 °C
Explanation:
Precision in scientific measurements refers to how close together the results of a repeated scientific measurement is. In this particular case where the melting point of fluorenone is being determined, precision refers to how close together the values from repeated measurements of the melting point of fluorenone is.
If we look at the values, the only one that is not close to others is 85.6 °C. Hence, if we remove this particular value, the data can be regarded as being precise.
Answer:
its C
Explanation:
how i know is did it on a piece of paper and got C for the answer. Have a nice day!
Significant Figures - write the number of significant figures in the blank.
______ 1. 53
______ 2. 53.0
______ 3. 0.053
______ 4. 0.0503
______ 5. 530
______ 6. 530.
______ 7. 530.0
______ 8. 5030
______ 9. 5030.
______ 10. 5030.001
______ 11. 5-300.001
Bob walks 81m East and then he walks 103m West.
The Answer your looking for is
He walked the distance of: = 184 m
Physical science is the study of
A. How matter and energy interact
B. All answers are true
C.energy
D.matter
Answer:
b
Explanation:
Answer:
B
Explanation: All answers are true
Name and describe the two types of observations. Please help!
Answer:
Quantitative and Qualitative :)
Explanation:
A drug is administered at a rate of 13.5 cL/hour. What is this rate in µL/s?
Answer:
A drug administered at a rate of 13.5 cL/hour has a rate in μL/s of 37.5 μL/s
Explanation:
The given rate at which the blood is administered = 13.5 cL/hour
The rate at which the question asked to be administered = μL/s
The conversion factor between cL and μL is given as follows;
1 cL = 10,000 μL
Which gives;
13.5 cL/hour × 10,000 μL/cL × 1 hour/(60 × 60 seconds) = 37.5 μL/s
Therefore, a drug administered at a rate of 13.5 cL/hour has an administration rate of 37.5 μL/s.
What is the charge of 5protons 6 neutrons and 5 electrons
Answer:
In this case the mass number would be 11.
Explanation:
The mass number of an element is the sum of the protons and neutrons. The number of neutrons for a given element is the only number that can change and still have the identity of the element stay the same, (because the atomic number is the number of protons).