hi can someone please help me answer this the question is in pictures
If you start with 42 g of Fe-53, how much is left after 8.51 minutes? I
Answer:
2:38
Explanation:
Answer:
2.58 good luck with everything
acrostic words or phrases that describe street dance
Define what natural gas is, explain how it forms, and
what it is used for today.
Answer:
is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.
It is formed when layers of decomposing plant and animal matter are exposed to intense heat and pressure under the surface of the Earth over millions of years. The energy that the plants originally obtained from the sun is stored in the form of chemical bonds in the gas
for heating, cooking, and electricity generation. It is also used as a fuel for vehicles and as a chemical feedstock in the manufacture of plastics and other commercially important organic chemicals.
Which ionization process requires the most energy? which ionization process requires the most energy? f(g) → f +(g) + e- o(g) → o +(g) + e- f +(g) → f 2+(g) + e- o +(g) → o 2+(g) + e-?
Explain why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards
Answer:
a: they're used in saucepan handles 'cause they don't soften when heated and also 'cause they cant be bent easily.
b: thermosetting plastics are bad electricity conductors. they don't get moulded and are also hard and strong.
A scientist performs an investigation in which thermal energy is removed from a sample of a substance. When the substance begins to change from a gas to a liquid, the scientist measures the temperature of the substance. This temperature is the substance's
A. melting point
B. freezing point
C. evaporation
D. condensation
A researcher is trying to identify whether household
substances are basic. Which approach would BEST help
the researcher investigate whether substances are
basic?
O A. Test each substance with blue litmus paper.
a
B. Test each substance with red litmus paper.
O
C. Mix each substance with a weak base and record the
results.
o
D.. Observe each substance and record its color.
What is the molality of a solution that contains 435 grams of Fe(ClO 2 3)3 , in 750.0 g of solvent?
Answer:
2.24 M
Explanation:
Molality is a measure of molar concentration of a solution and it can be calculated using the formula;
Molality = mole of solute ÷ kg of solvent
To calculate the number of moles present in the solute, we use the formula;
mole = mass ÷ molar mass
Molar mass of Fe(ClO2)3 = 56 + {35.5 + 16(2)}3
= 56 + (35.5 + 32)3
= 56 + (67.5)3
= 56 + 202.5
= 258.5g/mol
mole = 435/258.5
mole of Fe(ClO2)3 = 1.68mol
750g of solvent = 750/1000 = 0.750kg of solvent
Molality of the solution is thus: 1.68/0.750
Molality = 2.24 M.
The balanced chemical equation below represents the formation of magnesium chloride.
Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
At STP, what is the total number of liters of hydrogen gas produced when 3.00 moles of hydrochloric acid solution-HCl(aq) is completely consumed?
A.22.4 L
B.11.2 L
C.33.6 L
D.44.8
Answer:
C. 33.6L
Explanation:
Based on the reaction, 2 moles of HCl reacts producing 1 mole of hydrogen.
To solve this question we must find the moles of hydrogen produced using the reaction. Then, with combined gas law (PV = nRT) we can find the volume produced:
Moles H2:
3.00 moles HCl * (1mol H2 / 2mol HCl) = 1.50 moles H2 are produced
Volume:
PV = nRT
V = nRT / P
Where P is pressure = 1atm at STP
V is volume = Our incognite
n are moles of the gas = 1.50 moles
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273.15K
V = nRT / P
V = 1.50mol*0.082atmL/molK*273.15K / 1atm
V = 33.6L
C. 33.6LHow many atoms would be contained in 454 grams of iron?
Answer:
4.90 x 10 24 atoms
Explanation:
the 24 is the exponent for the 10
A Pitot-static probe is used to measure the speed of an aircraft flying at 3000 m. If the differential pressure reading is 3100 N/m2, determine the speed of the aircraft in m/s. The density of air at an altitude of 3000 m is 0.909 kg/m3. The speed of the aircraft is km/h.
Answer:
82.59 m/s or 297.324 km/h
Explanation:
From the question,
Applying
V = √[2(P'/ρ)].................. Equation 1 ( From
Where V = Speed of the aircraft, Differential Pressure of the air craft, ρ = Density of air at an altitude of 3000 m.
Given: P' = 3100 N/m², ρ = 0.909 kg/m³
Substitute into equation 1
V = √[2(3100/0.909)]
V = √(2×3410.34)
V = √(6820.68)
V = 82.59 m/s
V = 297.324 km/h
Hence the speed of the aircraft is 82.59 m/s or 297.324 km/h
Which organs are responsible for getting rid of waste from the human body?
Brain and pancreas
Kidneys and bladder
Heart and lungs
Muscles and bones
Answer:
Kidneys and Bladder is the organ responsible for getting rid of waste from the human body
Answer:
kidney and bladder
Explanation:
the kidney and bladder are the organs responsible for getting rid of waste in the human body
How can sound waves be used to put out fire
Food chains always begin with what type of organism? Why?
As the temperature of a gas is increased, the
average kinetic energy of its molecules
A decreases
B. increases
Cremains the name
Answer:
B- Increase
Explanation:
In the event that the temperature is increased, the normal speed and dynamic energy of the gas atoms increment. In the event that the volume is held steady, the sped up the gas particles brings about more incessant and more powerful crashes with the dividers of the compartment, hence expanding the pressing factor
An atom starts with 20 electrons and 20 protons; after a reaction, it has 18 electrons and 20 protons.
Answer:
(+20) + (-18) = +2
Explanation:
what's different between fat molecules and carbohydrate and protein molecules
Answer:
ddwadadadadwd
Explanation:
Name the salt produced if sodium carbonate reacts with dilute nitric acid ? Write the equation.
Answer:
2HNO3 +Na2CO3 → CO2 + H2O + 2NaNO3
Answer:
Na2CO3 + 2HNO3 → 2NaNO3 + CO2 + H2O
End product is Sodium Nitrate in solution, plus plenty of carbon dioxide gas bubbles and water.
Brainliest pweasee if I could help you! <3
0.45g sample of mineral ore is analyzed for chromium and found contain 0.560mg Cr2 O3. Express concentration of Cr2O3 in sample as percent
Answer:
0.124% of Cr2O3 in the sample
Explanation:
A mass percent is expressed as 100 times the ratio of the mass of analyte and the mass of the sample. For this problem, the equation is:
Mass Cr2O3(g) / Mass Mineral(g) * 100
To solve this question we must convert the mass of Cr2O3 to grams and then, compute the value in the equation:
Mass Cr2O3 in g:
0.560mg * (1g / 1000mg) = 5.6x10⁻⁴g Cr2O3
Percent of Cr2O3 is:
5.6x10⁻⁴g Cr2O3 / 0.45g * 100
0.124% of Cr2O3 in the sampleMethane undergoes combustion. Which products form?
CO2, H2O, and O2
C and H2O
CO2 and H2O
CO2 and H
When methane undergoes combustion the carbon dioxide (CO₂) and water (H₂O) is formed. Therefore, option C is correct.
What do you mean by combustion ?A chemical reaction between two or more substances, usually involving oxygen, that produces heat and light in the form of a flame is called as combustion. The reaction is as follows:
CH4(g) + 2O₂(g) → CO₂(g) + 2H₂O
Methane burns in the presence of enough oxygen to produce carbon dioxide (CO₂) and water (H₂O). When it is burned, it produces a large amount of heat, making it an excellent fuel source.
Thus, option C is correct.
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In the context of this graph, what do the slope and y-intercept mean?
Answer: The slope and y-intercept values indicate characteristics of the relationship between the two variables x and y. The slope indicates the rate of change in y per unit change in x. The y-intercept indicates the y-value when the x-value is 0.
Which on is right O& Mg?
OMG
MgO
Mg2O2
Mg+2O-2
Answer:
MgO
is the correct answer
hope it helps
Please Help me with number 4 I really need help please just tell me which letter is
Answer:
4. D
Explanation:
Matter can exist in three states namely: solid, gas and liquid. These three states are individually unique because they possess different properties or characteristics. Matter consists of particles, which behave differently in the different states.
Particles of a liquid e.g water, ethanol etc. will move freely about in the container it is placed but in close contact with one another. This means that the particles move freely while still attached to one another. This accounts for the reason liquids are said to FLOW.
The equation below shows the decomposition of lead nitrate. How many grams of lead (II) oxide are also produced when 20.5 g NO2 is formed?
Answer:
ligma
Explanation:
Which is an example of geologic evolution?
Answer:
A gradual change in the shape of the continents.
Explanation:
An example is tropical plant fossils are found in the Artic.
An example of geologic evolution is a gradual change in the size of continents.
Geological evolution is the process of gradual change and events in antiquity that include the steps to create the Earth.
At first, there was extreme volcanism, later the planet cooled to create the crust. Also, condensed water vapor formed the oceans and seas.
The geological history of Earth follows the major geological events in Earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy).
Geological evolution studies the shape of the globe, how it formed, and the relationships of the different eras and the matter that changed during them.
Therefore, An example of geologic evolution is a gradual change in the size of continents.
Learn more about Geological Evolution, here:
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need help i will give you thanks:)
Answer:
Precipitation
Explanation:
Precipitation is when water falls from the clouds back to earth as rain, snow, or hail. The water returns to the rivers to continue the water cycle. So, the answer is D, precipitation.
I hope this helps :)
Answer:
Vapor Information
Explanation:
Atmospheric rivers are relatively long, narrow regions in the atmosphere like rivers in the sky that transport most of the water vapor outside of the tropics. Not all atmospheric rivers cause damage, and most are weak systems that often provide beneficial rain or snow that is crucial to the water supply.
(You're welcome and have a nice day/night Ma'am/Sir.)
does adding acid make a solution more acidic or basic
Answer:
Adding an acid increases the concentration of H3O+ ions in the solution. Adding a base decreases the concentration of H3O+ ions in the solution. An acid and a base are like chemical opposites. If a base is added to an acidic solution, the solution becomes less acidic and moves toward the middle of the pH scale.
At terminal velocity, which two forces are balanced? *
gravity and air resistance
gravity and magnetism
O magnetism and air resistance
O friction and air resistance
Answer:
friction and air resistance
at terminal velocity, the weight of the object due to gravity is balanced by the frictional forces, and the resultant force is zero.
Write a question you have about Titan or about methane that could help you determine what happened to the lake
Answer: what would swimming in mathane lake on titan feel like.
Explanation:
Both methane and titan are gases that are combustible in nature.
Those gases which are inflammable are called combustible gases.
For example:-
MethaneEthaneThese gases have various uses in daily life. these uses as follows:-
CookingDecompositionUsed as fuelThe gas will mix in the lake which harms the aquatic animals. The aquatic animals have a hard time to breath.
Hence, the lake will be polluted.
For more information, refer to the link:-
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