Answer:
0.0036 moles of NaOH are present
Explanation:
A solution of 0.1mol/dm³ contains 0.1 moles of solute (In this case, NaOH), per 1 dm³ of solution.
36cm³ are in dm³ (1000cm³ / 1dm³):
36cm³ * (1dm³/1000cm³) = 0.036dm³
The moles are:
0.036dm³ * (0.1mol/dm³) = 0.0036 moles of NaOH are present
rare earth elements plz
Answer:
Rare earth elements are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium - that appear in low concentrations in the ground.
Explanation:
The rare earth elements (REE) are a set of seventeen metallic elements. These include the fifteen lanthanides on the periodic table plus scandium and yttrium. Rare earth elements are an essential part of many high-tech devices.
Which statement best describes John Dalton’s use of creativity in his work?
Answer:
c
Explanation:
Which would have more mass: a mole of sodium or a mole of copper? How do you know?
Answer:
copper
Explanation:
so for this you can work out the mass for both and compare
so mass = moles × mr
so mass of sodium = 1 × 23= 23 g
and mass of copper = 1 × 63.5= 63.5 g
so copper have more mass :)
A gas occupies 0.67 L at 350 K. What temperature is required to reduce
the volume to 0.21 L *
Answer:
109.7K
Explanation:
Using Charles law equation as follows;
V1/T1 = V2/T2
Where;
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
V1 = 0.67L
V2 = 0.21L
T1 = 350K
T2 = ?
Using the formula above;
0.67/350 = 0.21/T2
0.001914 = 0.21/T2
0.001914T2 = 0.21
T2 = 0.21/0.001914
T2 = 109.7K
what is the balanced equation of magnesium carbonate decomposes on heating to form magnesium oxide and carbon dioxide
Answer:
ExplaAt high temperatures MgCO3 decomposes to magnesium oxide and carbon dioxide. This process is important in the production of magnesium oxide. This process is called calcining: MgCO3 → MgO + CO2 (ΔH = +118 kJ/mol)
nation:
The Sulphate of x is XSO4 valency of x is
Answer: m mm
/lk ac
Explanation:
can someone pls tell me if this is correct? and also if possible, pls explain the difference between fractional and simple distillation, thank you sm <3
Explanation:
everything can be found in the picture
what is the mass of a moles of Mg(OH)2
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Mg(OH)2, or 58.31968 grams.
Someone help me with this science question pls
Answer: Can i see the question
Explanation:
ffg full form
gti
ccc
Answer:
Grand Tourer Injection
Anhydrous aluminium chloride contain 20.2% by mass of aluminium show that the emprical formula for anhydrous aluminium chloride
Answer:(d) has a high melting point because it has a giant covalent structure ... (i) Calculate the maximum mass of propyl ethanoate that can be made from 7.20 g of ethanoic ... (c) Anhydrous aluminium chloride contains 20.2% by mass of aluminium. (i) Show that the empirical formula for anhydrous aluminium chloride is A
Explanation:
Which diagram shows how the covalent bonds most likely form in a phosphorous trichloride molecule?
The first diagram shows the covalent bonds most likely form in a phosphorous trichloride molecule. Hence, option A is correct.
What is a covalent bond?Covalent bonds can be polar or nonpolar depending on the electronegativity difference between the atoms involved. In a nonpolar covalent bond, the electrons are shared equally between the atoms. In a polar covalent bond, the electrons are shared unequally.
Phosphorus trichloride (PCl₃) is a covalent compound that consists of one phosphorus atom and three chlorine atoms. The three chlorine atoms are located in a plane that is perpendicular to the phosphorus atom, forming an equilateral triangle with bond angles of 120°.
The molecule has a trigonal pyramidal shape, with the phosphorus atom at the apex and the three chlorine atoms at the base of the pyramid. The fourth hybridized orbital of phosphorus contains a lone pair of electrons that is located above the trigonal plane, giving the molecule a distorted tetrahedral geometry.
Thus, option A is correct.
To learn more about the covalent bond, follow the link:
https://brainly.com/question/10777799
#SPJ2
5. Discuss the phenomena of sunrise and sunset seen on Earth and describe how they will be different from the perspective of outer space. PLS IM OFFERING 15 POINTS PLSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
Answer:
deez
Explanation:
In the diagram shown, what is occurring at the section marked 4?
- Temperature
Heat Energy
O Melting
O Freezing
condensation vaporization
Please help me with this in the picture I need 8 thing wrong and 8 what should they do right
Which statement best summarizes what happens during cellular respiration?
A. Energy in food is released and stored in ATP molecules.
B. Energy from sunlight moves through a food web.
C. Chemical energy is converted to kinetic energy.
D. Solar energy is converted and stored in chemical bonds.
Answer:
A
Explanation:
B is for photosynthesis, C and D are just energy conversions, A is all about producing energy and stored as Adenosine Triphosphate(ATP) which is respiration
As the ZnCl2 dissolved, it separated into zinc ions and chloride ions. Choose the correct reaction.
A. Zinc was oxidized, chlorine was reduced.
B. Zinc was reduced, chlorine was oxidized.
C. This was not a redox reaction.
Answer:
This was not a redox reaction
Explanation:
A redox reaction is one in which a specie is oxidized and another specie is reduced. This means that one specie gains electrons while the other specie looses electrons.
Zinc chloride solid is composed of zinc ions and chloride ions. The ions only become free in solution. There is no change in the oxidation numbers of the ions as they dissolve in water.
Since the oxidation numbers of the species do not change, the process is not a redox reaction
In the formation of a covalent bond, electrons are …..
A- Gained
B- Transfered
D- Lost
E- Shared
Answer:
E-shared
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
who's know this one?
sand + witch?
Answer:
The Magician who lives in sand is called sand witch.
And sandwich is The name of one kind of food.
Answer:
Sandwich its food you eat it
Explanation:
The element copper has 29 protons. What is the atomic number of copper?
Answer:
29
Explanation:
since protons are a constant and unique characteristic of an element it's considered as he atomic number of that element.
Question 7 of 10
How much energy is required to melt 2 kg of aluminum? Use the table below
and this equation: Q- mLfusion
Substance
Latent Heat
Fusion
(melting)
(kJ/kg)
Melting
Point
(°C)
Latent Heat
Vaporization
(boiling) (kJ/kg)
Boiling
Point
("C)
Aluminum
400
660
1100
2450
Copper
207
1083
4730
2566
Gold
628
1063
1720
2808
Helium
5.2
-270
21
-269
Lead
245
327
871
1751
Mercury
11.4
-39
295
357
Water
335
0
2258
100
A. 2200 kJ
B. 800 kJ
C. 1600 kJ
D. 1100 kJ
Answer:
NO 2200! 800 proprobably
Explanation:
just did wrong
Answer:
800 kJ
Explanation:
Which compound is a hydrocarbon?
C 2 H 6
H 2 O
CO 2
C 6 H 12 O 6
Answer:
C2H6 OR C6H12O6 THE ANSWER
Explanation:
C2H6
!!!!!!!!!!
because it has both hydrogen and carbon as given in the word "Hydro-carbon"
Charles's law is a gas law relates volume to temperature. The law is named after (1) _____________________, who was a French inventor and scientist. He found through his experiment the volume of a gas increases linearly with an increase in the (2) _____________________. Shrinking of an inflated balloon and a bicycle tire in a very low temperature show the decrease of (3) ______________ which explains that the relationship of volume and temperature is directly related at constant (4) ______________. For a given sample of gas under two different conditions at a constant pressure, the equation can be written as (5) ________________________.
Answer:
1. Jacques Charles
2. Temperature
3. Volume
4. Pressure
5. [tex] \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Explanation:
Jacques Alexandre-César Charles was a French mathematician, scientist, inventor, balloonist, aeronaut, and physicist who was born on the 12th of November, 1746 in Beaugency, France and died on the 7th of April, 1823 in Paris, France. He was famously known for his invention of the first hydrogen balloon in 1783 and the discovery of Charles Law.
Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Charles' law is given by the formula;
[tex] VT = K[/tex]
[tex] \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Where;
V1 and V2 represents the initial and final volumes respectively.T1 and T2 represents the initial and final temperatures respectively.The blood must keep moving round the body to keep the rate of diffusion high explains why
Answer:
red blood cells and diffusion.
Explanation:
this process involves red blood cells and diffusion. Red Blood cells (RBCs) are a type of blood cell whose role is to transport oxygen from the lungs to the peripheral tissues of the body. Oxygen diffuses from the alveoli of the lungs in to the RBC's, where it binds to hemoglobin.
Diffusion is a very important process within the human body and is essential to the transport of molecules within a number of organs including the lungs, kidneys, stomach and eyes. The lungs process millions of tiny air sacs that are called alveoli, each of which are in close contact with capillaries.
12. Organelles allow eukaryotic cells to carry out more functions than prokaryotic cells.
True or false?
Answer:
True po
Explaination :
I hope it helps
A student is performing an experiment that requires measuring the boiling point of water. The accepted
value for the boiling point of pure water is 100.0°C. In the experiment, the student measured the boiling
point to be 99.2°C. What is the percent error in the student's experiment?
Answer:
.8°c my fingers jfjfjkfkrhrb
photographers take time-lapse photos of the night sky . one of them is at quarter the other is at the south pole , which photo will show that stars never rise and set. explain
Answer:
| EarthSky
Photographers take star trail photos by pointing their cameras at the sky and leaving the shutter open for long exposures, resulting in an image that ...
https://earthsky.org › tonight › circu...
"Para enfriar algo rápidamente se hace una mezcla de hielo con sal o, si tiene precaución, alcohol. El punto de congelación bajará y el hielo se derretirá rápidamente. Pese a aparentar haberse perdido el frío, la mezcla formada estará en realidad a unos cuantos grados bajo cero y será mucho más efectiva para enfriar que los cubos de hielo sólidos". El fenómeno relatado corresponde a una consecuencia de:
La pregunta está incompleta, la pregunta completa es;
"Para enfriar algo rápidamente, haga una mezcla de hielo cd sal o, si
tenga cuidado, alcohol. El punto de congelación bajará y el hielo
derretir rápidamente. A pesar de parecer haber perdido el frío, la mezcla
formado será en realidad unos pocos grados bajo cero y será
mucho más eficaz para enfriar que los cubitos de hielo sólido. "La
fenómeno reportado corresponde a una consecuencia de: *
una. Aumento del punto de ebullición
B. disminución de la presión de vapor
C. aumento de la presión de vapor
D. disminución del punto de congelación
Answer:
D
Explanation:
Esta pregunta recuerda las propiedades coligativas. Las propiedades coligativas son propiedades de sustancias que dependen de la cantidad de sustancia presente.
El punto de congelación es una propiedad coligativa. Se sabe que la presencia de impurezas reduce el punto de fusión y congelación. Esto se llama depresión del punto de congelación.
Por lo tanto, la observación registrada en la pregunta es el resultado de la disminución del punto de congelación.
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what is a chemical name for the compound with the formula Na2s? (sodium (na) has one valance electron and sulfur (s) has 7 valence electrons.)
a: sulfur sodate
b: sulfur bisulfate
c: sodium sulfate
d: sodium sulfide
Answer: sodium sulfide
