Answer:
0.0736 M or 10.4 g/L
Explanation:
First we convert 4.550 g of Na₂SO₄ into moles, using the molar mass of Na₂SO₄:
4.550 g ÷ 142.04 g/mol = 0.0320 molThen we calculate the final volume of the solution:
Final Volume = 0.350 L + 0.085 LFinal Volume = 0.435 LNow we can proceed to calculate the concentration -in molarity- of the solution:
Molarity = moles / liters0.0320 mol / 0.435 L = 0.0736 MIn g/L the concentration would be:
4.550 g / 0.435 L = 10.4 g/L3. Which of the following is the correct mathematical expression to use to
calculate the pH of a 0.10 Maqueous Ba(OH)2 solution at 25°C ?
Answer:
The pH of a 0.10 Maqueous Ba(OH)2 solution at 25°C is 13.30
Explanation:
The balanced equation is Ba(OH)2(s)→Ba2++2OH−
This indicates that the concentration is 0.2 M
We will find H+ ion concentration
As we know that
[H+][OH−]=1.0×10−14M
Given -
[OH−]=2.0×10−1M
Putting value of [OH-] in above equation we get -
[H+]=5.0×10−14M
pH=−log10[H+]
pH=−log10[5.0×10−14] = 13.30.
Which of the following formulas represent acids? Select all that apply.
a. NaOH
b. HCI
c. H2SO4
d. Ca(OH)2
e. KOH
f. HNO3
Answer:
B. HCl, C. H2SO4, F. HNO3
Explanation:
Acids have hydrogen (H) at the beginning
bases have OH at the end
HCl, H₂SO₄,HNO₃ are the chemical formulas which represent acids.
What are acids?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Out of the following , given sets of compounds HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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How do properties of water break down rocks?
Answer:
Explanation:
Freezing water can break rock without any change in the minerals that form the rock (physical weathering). This usually produces small particles and sand. Water with dissolved gases and other chemicals causes the minerals in rocks to be changed, leading to the deterioration of the rock (chemical weathering).
chemical weathering
Explanation:
freezing water when mix with it cause detorilation of rocks
What is the charge of a Li ion?
A. +1
B. +2
C. -1
D.-2
Answer:
A
Explanation:
because the charge of Li ion is +1 well I don't know the explanation yet but I'm sure about the answer
An unknown amount of Al203 decomposed producing 215 g of solid aluminum. 2Al2O3=4Al+3O2 How many grams of oxygen gas should be produced
Answer:
191.11 grams of oxygen gas should be produced.
Explanation:
The balanced reaction is:
2 Al₂O₃ → 4 Al + 3 O₂
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al₂O₃: 2 molesAl: 4 molesO₂: 3 molesBeing the molar mass of each compound:
Al₂O₃: 102 g/moleAl: 27 g/moleO₂: 32 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al₂O₃: 2 moles* 102 g/mole= 204 gramsAl: 4 moles* 27 g/mole= 108 gramsO₂: 3 moles* 32 g/mole= 96 gramsThen you can apply the following rule of three: if by stoichiometry 108 grams of aluminum are produced along with 96 grams of oxygen, 215 grams of aluminum are produced along with how much mass of oxygen?
[tex]mass of oxygen=\frac{215 grams of aluminum*96 grams of oxygen}{108grams of aluminum}[/tex]
mass of oxygen= 191.11 grams
191.11 grams of oxygen gas should be produced.
Fluorine, chlorine, and bromine react with gold.
which 1 of the 3 elements will be the most reactive with gold
thanks
Answer:
gold i believe or possibly bromine
Explanation:
q- how does fluorine react with gold
a- this fluoride compound features gold in its highest known oxidation state. this red solid dissolves in hydrogen fluoride, but these solutions decompose, liberating fluorine.
q- how does chlorine react with gold
a- gold does react with halogens. it'll, for example, react very slowly with chlorine gas at room temperature to form gold chloride, AuCl3. if gold chloride is heated gently, it will decompose to release the pure elements again.
q- how does bromine react with gold
a- gold in bromine solutions dissolves according to electrochemical/chemical (EC) mechanisms. ... in the chemical composition of the mechanism, this monovalent gold bromide disproportionate into gold and stable AuBr −4 , which reports into solution. with respect to pH, there are two characteristic dissolution regions.
** sorry that i can't provide a sure answer**
good luck :)
i hope this helps
have a nice day!
Fluorine will be most reactive with gold.
What is fluorine?
Of almost all of the elements, fluorine seems to be the most electronegative as well as reactive. Fluorine would be a diatomic, pale yellow, extremely corrosive, combustible gas with a strong smell. The lightest halogen would that be. It produces oxygen and even the incredibly corrosive hydrofluoric acid when it combines strongly with water.
What is reactive?Reactivity would be a substance's capacity to chemically combine with several other substances. Iron, for instance, reacts vigorously with oxygen.
As you move down the group, the halogens, which are non-metal elements in Group 7, become less reactive. In contrast to the alkali metals within Group 1 of the particular periodic table, this trend is the opposite. One of the most reactive elements in Group 7 was fluorine.
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Cyanobacteria, also known as blue-green algae, are a kind of bacteria found in lakes. These organisms make their own food through photosynthesis. Small animals including mayfly larvae eat the cyanobacteria, and small fish such as yellow perch eat the larvae. The small fish provide food for larger fish, such as walleye.
Choose the level of the food pyramid that represents the energy role of cyanobacteria in the lake ecosystem.
Balance the following equation: Fe2O3 + H2O --> Fe(OH)3
A.3,2,1
B.2,2,3
C.1,3,2
D.5,2,10
Answer:
answer is c
Explanation:
hope it helps!!!
Construct an explanation for why the physical properties of the inner core, outer core, and lower mantle are essential for the development of Earth's magnetic field.
Answer:
The hot temperature of inner core and outer core is responsible for the production of magnetic field.
Explanation:
The physical properties of the inner core, outer core, and lower mantle are essential for the development of Earth's magnetic field because the very high temperature of inner core is responsible for the formation of magnetic field. If the inner core is not very hot so the magnetic field will not be generated and our earth's atmosphere will not be save from the solar wind. It can be blown away by the solar wind if this magnetic field is not present so we can conclude that the physical properties of inner core and outer core is important for the production of magnetic field.
A 220.0 mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275 K. The piston is
pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310 K. What is the new
pressure of the sample?
274 kPa
216 kPa
Piston
243 kPa
51.1 kPa
Answer:
Explanation:
what did you get?
A cough sytup contains 0.5M dextromethophan. How many moles of the cough supressant are in 21.3mL of the cough syrup?
Answer:
0.0107 mol
Explanation:
Multiply concentration by volume (in liters) to get moles.
0.5 M • 0.0213 L = 0.0107 mol
For a reaction to be in equilibrium.... *
A. concentration of reactants and products remain constant
B. concentration of reactants and products must be the same
C. the rate of forward reaction is not equal to the rate of backward reaction.
Answer: C) the rate of forward reaction is not equal to the rate of backward reaction. This should be the answer.
Explanation:
The Concrete that surrounds a swimming pool takes less time to heat up than the water in the pool. Why
Answer:
The Concrete has a lower specific heat.
Explanation:
Is the following chemical equation balanced? 1 C2H6+ 102 - 3 H2O + 2
CO2 *
Answer:
No
Explanation:
Answer: smallest whole numbers are 2, 7, 4 and 6
Explanation: C2H6 + 3.5 O2. ⇒ 2. CO2 + 3 H2O
7. Cells often store materials like water, salts, proteins and carbohydrates in sac-like structures called A. Chloroplasts. B. Lysosomes. C. Mitochondria. D. Vacuoles.
Answer:
A
Explanation:
the chloroplast holds the water , nutrients
Answer:
[tex]\boxed {\boxed {\sf D. \ Vacuoles}}[/tex]
Explanation:
First, let's examine each answer choice.
A. Chloroplasts
These structures are only found in plant cells. They are the site of photosynthesis: the process that turns water, carbon dioxide, and light energy into glucose and oxygen.B. Lysosomes
These help remove and break down cellular waste. They contain special enzymes that allow them to digest certain molecules, bacteria, and old parts of the cell.C. Mitochondria
These are famously known as the powerhouse of the cell. They create energy from glucose and oxygen in a process called cellular respiration.D. Vacuoles
Vacuoles are sacs that store substances, including water, nutrients, and waste.Since the question asks us to pick the sac-like structures that store materials in cells, choice D: vacuoles is correct.
Which of the following is a symptom of mycoplasmosis in birds?
A. itchy rash
B. white ulcers
C. cloudy eyes
D. swollen joints
Answer:
Cloudy eyes
Explanation:
The article talks about eye infection
Dos objetos presentan fuerzas eléctricas repulsivas entre sí. ¿Cómo pueden ser las cargas eléctricas de estos objetos?
Answer:
Las cargas eléctricas de los objetos son ambas positivas o son ambas negativas.
Explanation:
Si dos objetos presentan fuerzas eléctricas repulsivas entre sí, quiere decir que ambos tienen el mismo tipo de carga.
Las cargas iguales (positivo con positivo, o negativo con negativo) se repelen, mientras que las cargas diferentes (positivo con negativo) se atraen.
fill in the blank if its true or false
T=True
F=False
_________ 1. Stars do not change over their life cycles.
_________ 2. A protostar is the latest stage of a star’s life.
_________ 3. The larger the mass, the shorter the life cycle.
_________ 4. The hottest stars are blue and the coolest stars are red.
_________ 5. The white dwarf eventually runs out of fuel and dies as a red dwarf.
_________ 6. Our Sun is in the main sequence at the moment.
Answer: 1. F
2. F
3. T
4. F
5. T
6. T
Explanation:
I am not sure i'm sorry if it isn't right
The specific heat of nickel is 0.445 J/g degree Celsius. How much heat is required to heat a 168 gram piece of nickel from 15.2 degrees Celsius to 43.6 degrees Celsius?
A sample of a gas in a balloon has a volume of 4.20 L and temperature of 48.2 °C. Calculate the volume when
the temperature is lowered to 15.4°C at constant pressure.
a. 3.77
b. 4.20
c. 1.34
d. 13.15
e. 4.68
Answer:
V1/T1=V2/T2
4.20L/321.2K=x/288.4K
multiply both side by 288.4
1211.28/321.2=x
x=3.77L
Option 3 13.15 is the correct answer.
What is Charles law?Charles's law exists as an experimental gas law that explains how gases tend to expand when heated. A modern statement of Charles's law exists: When the pressure on a sample of a dry gas exists held constant, the Kelvin temperature and the volume will be in direct proportion.
According to Charles law
The volume occupied by a fixed amount of gas is directly proportional to its absolute temperature, if the pressure remains constant.
[tex]V1/T1=V2/T2[/tex]
Where,
[tex]V1[/tex]= first volume
[tex]V{2}[/tex] = second volume
[tex]T{1}[/tex] = first temperature
[tex]T{2}[/tex]= second temperature
Here, at constant pressure,
[tex]V1/T1=V2/T2[/tex]
[tex]V1[/tex]=4.20 L
[tex]V2[/tex]= x
[tex]T1[/tex]=321.2 K
[tex]T2[/tex]=288.4 K
Therefore, [tex]V1/T1=V2/T2[/tex]
4.20L/321.2K=x/288.4K
1211.28/321.2=x
x=3.77L
Thus option a is correct.
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Weathering (breaking off sediments upriver), erosion (moving the sediments down river) and finally deposition caused the changes in the river.
What helps hold sediments in place to prevent erosion?
Answer:
Explanation:
Maintaining a healthy, perennial plant cover.
Mulching.
Planting a cover crop – such as winter rye in vegetable gardens. ...
Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.???
What determines crystal size in minerals formed by lava or magma?
Answer:
When magma cools, crystals form because the solution is super-saturated with respect to some minerals. If the magma cools quickly, the crystals do not have much time to form, so they are very small. If the magma cools slowly, then the crystals have enough time to grow and become large.
Explanation:
What is the density of krypton gas (MM = 83.8 g/mol) at 3.00
atm and 100. °C?
g/L
Answer:
8.21
Explanation:
The volume of a gas is 550 mL at 960 mm Hg and 200.0 C. What volume
would the pressure of the gas be 830 mm Hg if the temperature is reduced
to 150.0C? Make sure your answer is rounded to nearest whole number
and your final answer has the units of mL. *
Answer:
The volume will be 568.89 mL.
Explanation:
Boyle's law says that "The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"
Boyle's law is expressed mathematically as:
Pressure * Volume = constant
or P * V = k
Gay-Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. That is, the pressure of the gas is directly proportional to its temperature. Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T}=k[/tex]
Where P = pressure, T = temperature, K = Constant
Finally, Charles's law indicates that as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T}=k[/tex]
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{P*V}{T} =k[/tex]
Studying an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]
In this case:
P1= 960 mmHgV1= 550 mLT1= 200 C= 473 K (being 0 C=273 K)P2= 830 mmHgV2= ?T2= 150 C= 423 KReplacing:
[tex]\frac{960 mmHg*550 mL}{473K} =\frac{830 mmHg*V2}{423 K}[/tex]
Solving:
[tex]V2=\frac{423 K}{830 mmHg} *\frac{960 mmHg*550 mL}{473K}[/tex]
V2= 568.9 mL
The volume will be 568.89 mL.
WILL MARK BRAINLEST
Which of the following are sources of greenhouse gasses? Select all that apply
a
Bike Riding
b
Cow Farts
c
Growing Trees
d
Burning Coal
e
Car Exhaust
Answer:
b and c
Explanation:
sorry if i'm wrong
Answer:
b, c, d, e
Explanation:
What fossil helped support Wegener's hypothesis of continental drift?
A. Gondwanaland
B. Kannemeyerid
C. Mesosaurus
D. Glossopteris
Answer:
Glossopteris
Explanation:
Glossopteris is a fossil fern that helped support Wegener's hypothesis.
Hope this helps! Have a great day!
A3.00 mol sample of CO2 (g) is in a rigid 6.00 L container at 400.°C.
Which of the following is the pressure of the gas?
16.4 atm
27.6 atm
200. atm
995 atm
Answer:
i'm thinking 27.6 not sure
Explanation:
what are some ways that you can change the physical phase of matter?
How does matter change from one state to another
Answer:
Adding or removing energy can change the physical matter.
Explanation:
Like for example changing temperature
PLZ HELP!
Where have you seen or known of examples of waves in YOUR LIFE? Based on science terms of a wave.
Answer:
QUESTION:
Where have you seen or known of examples of waves in YOUR LIFE? Based on science terms of a wave.
ANSWER:
I've seen the following in my life:
~ Lightwaves
~ Heatwaves
~ Electromagnetic waves
~ X-rays
~ Tsunami Waves
Explanation:
Hope that this helps you out! :)
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please help me with this chem question!!
Answer:
caca123
Explanation:
UM
