Answer:
The composition of a pure substance is always the same, regardless of the source, but the composition of a mixture can vary.
Mixtures can be separated into their components by physical changes; some pure substances can be separated into components by chemical change.
Explanation:
A chemically pure substance has a well defined and constant composition. The composition of a chemically pure substance remains the same irrespective of its source. Also, the components of a chemically pure substance may be separated by chemical changes.
Mixtures have a variable composition depending on their respective sources. The composition of a mixture varies with the source of the mixture and mixtures are separated by physical processes.
A gas has a pressure of 3.33 kPa at 343 K. What will the new pressure be at 655 K if the volume does not change?
Provide one example where a neutralization reaction is undesired/harmful. State the reactants and explain why it is harmful for this reaction to take place.
Answer:
You're in my science class wth
Explanation:
For instance farmers are using basic fertilizers to neutralize an acid soil –which is harmful for the plants- while basic solutions are added in the chimneys of factories to neutralize the acid smoke that they produce –avoiding the catastrophic effects of the acid rains. Acid released in the environment from industry creates acid rain which has many ecological effects. Acid rain makes waters acidic, and causes them to absorb the aluminium that makes its way from soil into lakes and streams. This combination makes waters toxic to crayfish, clams, fish, and other aquatic animals.
11
1. If 325 grams of sodium nitrate are added to water to make the total solution volume 5.5 L,
what is the concentration (molarity) of this solution?
Answer: 0.695 mol/L
Explanation:
To find the final concentration of the solution, we must first identify the moles of the solute (NaNO₃):
moles = mass ÷ molar mass
∴ moles of NaNO₃ = 325 g ÷ 84.995 g/mol
= 3.824 mol
Now, since the final volume is 5.5 L and this volume contains the 3.824 moles of NaNO₃,
then the molarity of the solution = 3.824 mol ÷ 5.5 L
= 0.695 mol/L
When calcium metal is placed in water a vigorous single replacement rection occurs, releasing hydrogen gas. What will happen to the pH of the solution that forms as this chemical reaction proceeds
Answer:
The pH of the solution increases
Explanation:
One of the properties of metals is that they react with water to yield hydrogen gas and the hydroxide of the metal.
Calcium is a metal in group two of the periodic table and also undergoes such reaction.
The equation of the reaction is;
Ca(s) + 2H2O(l) -----> Ca(OH)2(aq) + H2(g)
Since Ca(OH)2 is alkaline, the pH of the solution increases.
what does Avogadro's law state and what is the formula
The law is approximately valid for real gases at sufficiently low pressures and high temperatures. The specific number of molecules in one gram-mole of a substance, defined as the molecular weight in grams, is 6.02214076 × 1023, a quantity called Avogadro's number, or the Avogadro constant.
Answer:
Hello There!!
Explanation:
The answer is that it states that under the same pressure and temperature conditions, equal volumes of all gases contain the same number of molecules.
Formula:Vn=k
hope this helps,have a great day!!
~Pinky~
In which radiation does the mass number decrease by 4 and proton number of the nuclei decrease to form a new element?
Answer:
Alpha
Alpha decay
When a nucleus emits an alpha particle, these changes happen: the mass number decreases by 4.
When 35.47 g of sodium hydroxide react with boric acid (H3BO3), how many moles of sodium borate will be produced?
Answer:
5.83 g
Explanation:
First, you must start with a balanced equation so you can see the mole ratios.
NaOH + H₃BO₃ --> NaBO₂ + 2H₂O
You can see that it takes 1 mole of sodium hydroxide to form 1 mole of sodium borate. 1:1 ratio
Now you must calculate how many moles of NaOH 35.47 g equals.
Na = 22.99 amu
O = 15.99 amu
H = 1.008 amu
NaOH = 39.997 amu
35.47 g ÷ 39.997 amu = 0.08868 moles of NaOH
Since it's a 1:1 ratio, the same number of moles of NaBO₂ is created. Now you must convert moles to grams.
Na = 22.9 amu
B = 10.81 amu
2 O = 31.998 amu
NaBO₂ = 65.798 amu
0.08868 moles x 65.798 = 5.83 g
4.60 mL of 0.1852 M HNO3 is titrated to the phenolphthalein indicator endpoint with 27.35 mL of a KOH solution. What is the molarity of the KOH solution
Answer:
[tex]M_{base}=0.0311M[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to solve for the molarity of the KOH solution by knowing this base react in a 1:1 mole ratio with nitric acid, HNO3; thus, we can write the following equation, as their moles are the same at the endpoint:
[tex]n_{acid}=n_{base}[/tex]
Which in terms of molarities and volumes is:
[tex]M_{acid}V_{acid}=M_{base}V_{base}[/tex]
Thus, we solve for the molarity of the base (KOH) to obtain:
[tex]M_{base}=\frac{M_{acid}V_{acid}}{V_{base}} \\\\M_{base}=\frac{4.60mL*0.1852M}{27.35mL}\\\\M_{base}=0.0311M[/tex]
Regards!
the cells are utilising _______ which are produced during the process of cell respiration
Answer:
sana nakatulong po sainyo
Which area of science is considered the central science?
chemistry
biology
physics
environmental science
Answer:
Chemistry
Explanation:
Chemistry is considered the central science.
Which area of science is considered the central science?Chemistry is sometimes called "the central science" because it's so important to other fields of science, like biology, geology, astronomy, physics, medicine, engineering, materials science, and many other areas of study.
Which branch of science is the most important?All the branches of science possess their own level of importance, However, physics deals with the fundamental workings of material reality which are central to all other branches of science.
Learn more about chemistry here https://brainly.com/question/24419453
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What is the wavelength of a wave?
Answer:
Wavelength (λ) – The distance of one complete cycle in the wave. The distance between two consecutive crests and /or troughs. S.I. Unit: metre (m).
In other words:
Wavelength is the distance from crest to crest (or trough to trough).
Which of these events is likely to have caused the mass extinction of the dinosaurs?
A.An increase in Earth's overall temperature
B. A large volcanic eruption on nearby islands
C. The fallout of a meteor colliding with Earth's surface
D. Rising sea levels flooding low-lying coastlines
Compare the purple and orange arrows. Does more energy go into breaking bonds, or is more energy released when new bonds form?
Answer:
The breaking of chemical bonds never releases energy to the external environment. Energy is only released when chemical bonds are formed. In general, a chemical reaction involves two steps: 1) the original chemical bonds between the atoms are broken, and 2) new bonds are formed. These two steps are sometimes lumped into one event for simplicity, but they are really two separate events. For instance, when you burn methane (natural gas) in your stove, the methane is reacting with oxygen to form carbon dioxide and water. Chemists often write this as:
CH4 + 2 O2 → CO2 + 2 H2O + energy
Explanation:
here is the answer
1 mole of hydrochloric acid reacts with 1 mole of sodium hydroxide to give _______ g of sodium chloride.
Answer:
58,5
Explanation:
Which of the following molecules is polar?
CH3F
CF4
CCl4
All of the molecules are polar.
Answer:
CH3F
Explanation:
because if drawn out its is asymmetric
A 0.530 M Ca(OH)2 solution was prepared by dissolving 36.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution thus formed?
Answer:
0.917
Explanation:
Answer:
0.917
Explanation:
Just took the test
Two hundred liters of helium at 2.00 atm and 28.0 °C is placed into a tank with an internal pressure of 5.92 atm. Find the volume of the helium
after it is creleased into the tank when the temperature of the tank.remains 28.0°C.
liters (Round to three sig figs)
Answer:
27*6 dkfkdh hshsnnsbssshs ss. hhshsns svs s ssjssgsyz
Explanation:
ysgshssbs
HELP!
The piston of an internal combustion engine
compresses 218 mL of gas. The final pressure
is 15 times greater than the initial pressure.
What is the final volume of the gas, assuming
constant temperature?
Answer in units of mL.
Answer:
14.53
Explanation:
V1= 218ML
V2= ?
P2= 15P1
USING BOYLE'S LAW
P1V1= P2V2
V2= P1V1/P2
V2 = P1(218ML)/15P1 = 14.53ML
4.
The relationship between how much mass matter has in a given volume is called
A. density
O
B. boiling point
C. melting point
O
D. weight
[tex]\huge{ \mathrm{ \underline{ Answer }\: \: ✓ }}[/tex]
The relationship between mass of matter per unit volume is known as :
[tex] \large \boxed{ \mathrm{density}}[/tex]
_____________________________
[tex]\mathrm{ ☠ \: TeeNForeveR \:☠ }[/tex]
Hello, anyone? help me
Como Representar la distribución electrónica por el método de la escalera y con los cajones de la distribución eléctronica: En "s" máximo 2 electrones En "p" máximo 6 electrones En "d" máximo 10 electrones
Answer:
Como Representar la distribución electrónica por el método de la escalera y con los cajones de la distribución eléctronica: En "s" máximo 2 electrones En "p" máximo 6 electrones En "d" máximo 10 electrones
Explanation:
SISISISISISISISISISISI
Which of the following
are
products of photosynthesis?
1 water
2 carbon dioxide
3 glucose
4 oxygen gas
Multiple choice
Answer:
4. oxygen gas
Explanation:
when a plant goes through photosynthesis, it takes in Carbon Dioxide and releases Oxygen
how do valence electrons interact between non polar covalent, polar covalent, and ionic bonds?
Answer:
In non-polar covalent bonds, the electrons are equally shared between the two atoms. For atoms with differing electronegativity, the bond will be a polar covalent interaction, where the electrons will not be shared equally.
Explanation:
i did some reasherch so there^^
what is the method use to separate sand and water
Sand and water can be separated by any of the following methods:
1. Sedimentation and decantation: This method involves the mixture being kept undisturbed for some time. After some time, sand being heavier and insoluble in water, settles down at the bottom of container. Now, water is poured into another container to separate it from sand.
2. Filtration: This method involves the mixture being passed through a filter paper (a filter with very fine pores). Sand particles being larger in size are retained by the filter paper and get separated from water.
I hope this helps! :D
you can test carbon dioxide gas with
Answer: Carbon dioxide reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
Explanation:
****Isra****
The data showed that recently the alligator population has decreased. How could the decrease in the alligator
population affect the other populations? Be sure to explain whether the gar population, the diving duck population, a
the crab population will change, and why.
Answer:
Since the alligator population decreased, this means there are less predators for the gar. Less predators for the gar mean the gar population will increase. More gar also means more competition for the diving duck in terms of animals that eat crabs, and thus the diving duck population will also decrease.
Explanation:
Hope this helped <3
If this block has a mass of 173.7 grams, then what is this element??
Answer:
C
I am pretty sure that is the answer
The mass of the given cube of 173.7g and the volume of the box is 9 cm³.Then the density is 19.3 g/cm³. Therefore, the element with this density is gold. Option D is correct.
What is density?Density of a substance is the ratio of mass to its volume. Thus it tells about how much denser the substance is in the given volume. This physical quantity is dependant on mass, volume temperature and pressure.
The element have their own density corresponding to the mass and volume used. The dimensions of the given box is 3, 3 and 1. Thus volume is the product of this length, breadth and height.
Volume = 3 ×3 × 1
= 9 cm³.
Mass of the box is given 173.7 grams. Now, the density of the element is calculated as follows:
Density = 173.3 / 9 cm³
= 19.3 g/cm³.
From the table, it is clear that the this density corresponds to the element gold. Therefore, option D is correct.
To find more about density, refer the link below:
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ONLY ANSWER IF YOU ARE SURE PLEASE
Hamood backwards is hamood
Answer:
dang bro, thats deep
Explanation:
so deep imma cry
Akosua has observed that anytime she drinks sobolo, her stool appears dark green. On one occasion
Akosua observed that her stool, which appeared dark green, turned quickly to bright red upon mixing with the perchloric acid-treated WC water.
i. What about the sobolo drink (bright red) that made the stool of Akosua green?
ii. Why did the stool of Akosua, which appeared green because she took sobolo drink, turn into
bright red upon mixing with the acidic WC water?
iii. Suggest a practical use of sobolo drink in the identification of chemicals in the science laboratory .
Answer:
i. Sobolo is a Ghanian drink that is produced from red hibiscus flower that has an average pH of 6.7
It contains cyanidin and anthocyanins, which is a red pigment that is red in an acidic medium and changes green when introduced in a basic medium that has a high pH
The pH at the rectum of the digestive system = 5 to 8 (Slightly basic)
Therefore, what made the stool of Akosua green is that the sobolo drink changes to green in basic solution
ii. The stool which appeared green because she took sobolo turn into bright red upon mixing with the acidic WC water because of the presence of anthocyanins in sobolo, it turns red in an acidic medium
iii. Sobolo which turns green, or blue in a basic medium and red in an acidic medium can be used as a litmus solution to test the pH of a given substance
Explanation:
Sobolo or soobolo in Ghana is a name for the Hibiscus tea or tisane, which is made from calyces of the hibiscus plant, and has a sour (tangy) taste and appears bright red in color