Answer:
100 g
Explanation:
From the question given above, the following data were obtained:
Original amount (N₀) = 400 g
Time (t) = 4 years
Half-life (t½) = 2 years
Amount remaining (N) =?
Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:
Time (t) = 4 years
Half-life (t½) = 2 years
Number of half-lives (n) =?
n = t / t½
n = 4 / 2
n = 2
Thus, 2 half-lives has elapsed.
Finally, we shall determine the amount remaining of the radioactive isotope. This can be obtained as follow:
Original amount (N₀) = 400 g
Number of half-lives (n) = 2
Amount remaining (N) =?
N = 1/2ⁿ × N₀
N = 1/2² × 400
N = 1/4 × 400
N = 0.25 × 400
N = 100 g
Thus, the amount of the radioactive isotope remaing is the 100 g.
Which angle allows the soil to receive the most direct ligh
0 degrees
20 degrees
45 degrees
90 degrees
Answer: 90 degrees .
Which waves can travel through empty space?
A. Light waves
B. Mechanical waves
C. Sound waves
D. Water waves
SUBIN
Answer:
light waves a
Explanation:
because there's all kinds of different light in space if you think about it like the bright stars or the bright moon it's kind of like light it just makes sense when it's traveling for space water waves obviously it's not possible that travels through the air or like on a beach sound waves you can't really cure much in space and mechanical waves is pretty much the action of an object or something like that kind of it's pretty much happens on Earth but light waves happen for like asteroids or shooting stars a comments it happens all the time for space so it makes just perfect sense
Determine the mass of CO2 formed if 15 grams of C4H10
Answer:
[tex]m_{CO_2}=45gCO_2[/tex]
Explanation:
Hello there!
In this case, since the combustion of butane is:
[tex]C_4H_{10}+\frac{13}{2} O_2\rightarrow 4CO_2+5H_2O[/tex]
Thus, since the molar mass of butane is 58.12 g/mol and that of carbon dioxide is 44.01 g/mol, we obtain the following mass of CO2 product:
[tex]m_{CO_2}=15gC_4H_{10}*\frac{1molC_4H_{10}}{58.12gC_4H_{10}} *\frac{4molCO_2}{1molC_4H_{10}} *\frac{44.01gCO_2}{1molCO_2} \\\\m_{CO_2}=45gCO_2[/tex]
Best regards!
What usually happens to the solubility of gas as temperatures decreases?
Answer:
the solubility of the gas increases
Explanation:
as the kinetic energy of a gaseous solute increases,its molecules has a greater chance of escaping the attraction of the solvent molecules and return to the gas phase..which lead to the solubility of the gas been Increase as the temperature decreased .
This table lists plant adaptations and their functions.
Adaptation Function
flower aids in reproduction
bark ?
cuticle stops water loss
thorns stops predators
Which phrase correctly completes the chart?
A. stores seeds
B. provides protection
C. attracts pollinators
D. carries water
The unusually fast rate at which many glaciers globally are melting is due to
he lies of scientists
too many tree-huggers breathing
human induced Global Warming
political opinion
Answer: human induced global warming
Explanation:
It’s the only one that makes sense if you read the question
How to tell a physical property and a chemical property? Someone help please I do not understand the differences and how to tell them apart
Answer:
physical properties:
include
-color
-shape
-size
or just the overall physical appearance of the substance
chemical properties:
basically anything that has to do with chemicals
How many moles are in 2.8x10^23 atoms of Calcium?
Answer: 1 mole ➡️ 6.022×10²³ atoms of si.
X mole ➡️ 2.8×10²⁴ atoms of si.
X = 2.8×10×10²³/6.022×10²³
= 28/6.022
= 4.65 moles.
Explanation:
The total number of moles in 2.8x10^23 atoms of Calcium will be 4.65 moles.
What is a mole?The mole is defined as the amount of substance containing the same number of chemical units (atoms, molecules, ions, electrons, or other specified entities or groups of entities) as exactly 12 grams of carbon-12
The mole unit allows us to express amounts of atoms and molecules in visible amounts that we can understand.
For example, we already know that, by definition, a mole of carbon has a mass of exactly 12 g. This means that exactly 12 g of C has 6.022 × 10 23 atoms
1 mole is 6.022×10²³ atoms of calcium
one mole of calcium = 2.8×10²⁴
substitute the value in the equation,
2.8×10²⁴ atoms of calcium = 2.8×10×10²³/6.022×10²³
total number of moles = 28/6.022= 4.65 moles
Therefore, the total number of moles will be 4.65 moles
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pls help will give brainilest or however you spell it
Answer:
1. balanced
2. balanced
3. unbalanced
4. balanced
5. balanced
6. unbalanced
7. balanced
8. unbalanced
Explanation:
What is an example of a neutral mutation? a frog born with white skin a person's inability to break down sugar a red flower with one part colored yellow
Answer:
I think a red flower with one part colored yellow
Explanation:
a red flower with one part colored yellow
if the pressure, volume, and tempature of a gas are known which can most likely be found by using the ideal gas law
• the molar amount of the gas
•the partial pressure of the gas
•the stand temperature
•the molar mass
Answer:
• The molar amount of the gas
Explanation:
Hello!
In this case, according to the ideal gas law:
[tex]PV=nRT[/tex]
Whereas P stands for pressure, V for volume, n for the molar amount of the gas, R for the universal gas constant and T for the temperature, we can see that as pressure, volume and temperature are given, we can compute the molar amount of the gas as shown below:
[tex]n=\frac{PV}{RT}[/tex]
Since R is a constant always.
Best regards!
1. If 3.25 moles of oxygen were consumed, how much moles of carbon dioxide are
produced?
Answer:
3.25 mol CO₂
Explanation:
Step 1: Write the balanced equation
C(s) + O₂(g) ⇒ CO₂(g)
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of O₂ to CO₂ is 1:1.
Step 3: Calculate the number of moles of CO₂ produced from 3.25 moles of O₂
We will use the previously established molar ratio.
3.25 mol O₂ × 1 mol CO₂/ 1 mol O₂ = 3.25 mol CO₂
I will give brainliest. If you burn the carbon in limited air, the reaction is
different: 2C (s) + 0, (g) → 200 (g)
a What volume of gas will form this time?
b What volume of oxygen will be used up?
This reaction is different in that the carbon undergoes an incomplete combustion as opposed to complete combustion where carbon is fully oxidized. A caveat: incomplete combustion products in general can be difficult to predict without sufficient information, as it's not uncommon to obtain a mixture of different products.
Here, we are told that solid carbon is burned in limited air to produce a gas. I am presuming that, in the equation that's given, the "0" represents a blank where you must fill in a chemical symbol. In this case, our equation would be: 2C(s) + O₂(g) → 2CO(g).
There is not enough information here to provide the numerical answers to the two questions. From the words in the question (e.g., "is different" and "this time"), it would seem that this question is an excerpt from a larger or preceding question where specific numbers had been provided or computed.
However, it's possible to make some general observations on how one may go about answering these questions if one had more information.
Since we're to assume that oxygen is the limiting reagent, if one is given the amount of solid carbon (either in mass, moles, or number of atoms), it's possible to determine the moles of CO(g) that's produced since C and CO have an equal stoichiometric ratio. So, for example, if one burns 2 moles of C(s), then 2 moles of CO(g) would be produced.
But, there is still not enough information to compute the volume of CO gas if this is the line of questioning. We don't know, for instance, the temperature or pressure of the reaction conditions. In fact, the only way it would be possible to answer this would be if you were given beforehand a conversion factor that relates the volume of CO(g) to its quantity (e.g., to assume that one mole of gas occupies x liters).
As for the second question, this would depend on what you know about the quantity of the C(s) reacted and/or the quantity (or volume, from question a) of CO(g) produced. If you can get the number of moles of C(s) reacted or CO(g) produced, the number of moles of O₂(g) used up: It would be half the number of moles of C(s) reacted or half the number of moles of CO(g) produced). Again, it's impossible to determine the volume of O₂(g) using just the information provided here, so I suspect that you must have further information relating gas quantity to volume. As we did with CO(g), the volume of O₂(g) used up can be found using whatever conversion factor you have.
If you have any further information or questions, please feel free to follow up.
This reaction is distinct in that the carbon undergoes incomplete combustion rather than complete combustion, in which the carbon is completely oxidized. incomplete combustion products in general can be difficult to predict without sufficient information, as a mixture of different products is not uncommon.
What is combustion ?Combustion is a chemical reaction in which a substance reacts with oxygen to produce heat. Combustible refers to a substance that can be burned. It is also known as a fuel. The fuel can be either solid, liquid, or gas.
We're told that solid carbon is burned in a small amount of air to produce a gas.
This would be determined by the amount of C(s) reacted and/or the amount (or volume, from question a) of CO(g) produced. If you can calculate the number of moles of C(s) reacted or CO(g) produced, you can calculate the number of moles of O2(g) consumed: It would be half the amount of C(s) reacted or half the amount of CO(g) produced).
Thus, This reaction is distinct in that the carbon undergoes incomplete combustion rather than complete combustion.
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Calculate the mass of 6.02 x 10^23 formula units of iron (III) chloride, FeCl3?
Answer: 162.2 g
Explanation: 6.02 × 10^23 particles is one mole.
Molar mass of FeCl3 is 55.85 + 3· 35.45 = 162.2 g/mol
The Earth’s atmosphere is divided into five layers. In which layer does all life exist?
Question 1 options:
Exosphere
Stratosphere
Mesosphere
Troposphere
Question 2
As you travel from the surface up through the atmosphere in outer space, the gases or air pressure becomes
Question 2 options:
more dense/increases
less dense/decreases
Higher in temperature
Consistently lower in temperate
Question 3
This gas is found in the stratosphere where it helps protect us from UV radiation.
Question 3 options:
Ozone
Oxygen
Nitrogen
Carbon dioxide
Question 4
What is the most abundant gas in our atmosphere?
Question 4 options:
oxygen
hydrogen
nitrogen
water vapor
Question 5 (1 point)
This vascular tissue carries water absorbed by the roots to the other parts of the plant.
Question 5 options:
phloem
xylem
Question 6 (1 point)
The protist seen here is called euglena. It is both animal-like and plant-like. It eats food but it also has chloroplasts like a plant cell, in order to make food. The euglena has one structure that helps it move. It is visible here. What is that cellular structure?
Question 6 options:
Cilia
Flagellum
pseudopod
Golgi Bodies
Question 7 (1 point)
Which kingdom is MOST LIKELY to contain organisms that are decomposers?
Question 7 options:
Kingdom Fungi
Kingdom Eubacteria
Kingdom Animalia
Kingdom Plantate
Question 8 (1 point)
In the oceans the colder water sinks into deep basins, while warmer water stays closer to the surface. The water then moves around the ocean basin. This causes
Question 8 options:
Tidal waves
Wind Drifts
Ocean convection currents
Plate tectonics
Question 9 (1 point)
Which best explains how insects help flowering plants in reproduction?
Question 9 options:
Insects help keep predators, like birds, away from flowers' seeds
Insects store food in flowers, providing nutrients flowers need to make seeds.
Crawling insects cause pollen to fall on the ground beneath flowering plants.
As they fly, insects spread pollen that sticks to their bodies from the flowers.
Question 10 (1 point)
Jaime is picking out a skillet for his mother as a birthday present. He is looking at two skillets, one with a plastic handle and one with a metal handle. Thinking just about safety, which handle would you recommend to Jaime and why?
Question 10 options:
The metal handle, because it will last longer.
The plastic handle, because it is light weight
The metal handle, because it is a good conductor
The plastic handle, because it is a good insulator.
Question 11 (1 point)
Fungi is a very simple eukaryotic organism. Unlike plants and some protists, fungi is a consumer. This example lives in/on a tree. How is this fungus consuming food in the picture?
Question 11 options:
The roots of the fungus can absorb nutrients from the soil.
The hyphae, or feeding structures, reach deep into the wood to obtain nutrients.
The white cap of the fungus traps small insects and other organisms as they pass by.
The cap of the fungus can absorb chemicals from the air, like carbon and oxygen, and use the gases to make food.
Question 12 (1 point)
The type of energy stored in food and batteries is
Question 12 options:
kinetic energy
chemical energy
mechanical energy
electromagnetic energy
Question 13 (1 point)
The Law of conservation of energy states that energy cannot be
Question 13 options:
Stopped or started
Hot or cold
created or destroyed
Kinetic or potential
Question 14 (1 point)
A current-carrying coil of wire with many loops that can become magnetized is called a(n)
Question 14 options:
Insulator
Electromagnet
Resistor
Aurora
Question 15 (1 point)
Heat transfers occurs
Question 15 options:
Only from cold to hot
Both a and c
Only from hot to cold
It doesn’t transfer
Question 16 (1 point)
Malcolm's class has been assigned a project in which it is to build a four-wheeled vehicle to transport a can of soda across the classroom. The car will be powered by stretching rubber bands around an axle before releasing the vehicle on the floor.
The vehicle will be powered by transforming _______ energy into _______ energy.
Question 16 options:
Thermal; mechanical
Mechanical, thermal,
Kinetic, elastic potential
Elastic potential, kinetic,
Answer:
1. troposphere
2. less dense/decreases
3. ozone
4. nitrogen
5. xylem
6. flagellum
7. kingdom fungi
8. Ocean convection currents
9. As they fly, insects spread pollen that sticks to their bodies from the flowers.
10. the plastic handle, because it is a good insulator.
11. The hyphae, or feeding structures, reach deep into the wood to obtain nutrients
12. chemical energy
13. created or destroyed.
14. electromagnet
15. c
16. kinetic, elastic potential
Which of the following best describe the parts of the volcano?
a .mountain or hill
B. are openings in the earth surface
c. are found only on land D. composed of caldera, vent and crater
Answer:
B. are openings in the earth surface
1. The decomposition of CaCO3 proceeds according to the following equation.
A. If 5 moles of CaCO3 decompose completely, how many moles of CaO are created?
B. If 1 mole of CaCO3 decomposes completely, how many grams of CO2 are created?
C. If 30 grams of CaCO3 decomposes completely, how many grams of CO2 are created?
2. A chemical reaction proceeds according to the following equation.
SiO2 + 4 HF → SiF4 + 2 H2O
A. If 5 moles of SiO2 are used in this reaction, how many moles of H2O are created?
B. If 34.2 moles of HF are used in this reaction, how many grams of H2O are created?
C. If 9.4 grams of SiF4 are created in this reaction, how many grams of SiO2 were used?
Which of the following formulas represents an empirical formula?
A. C8H18
B. C4H10
C. C2H5
D.C2H4
Answer:
C is the only option that represents an empirical formula, as it can't be simplified further.
You can turn C8H18, for example: to C4H9, but you can't do the same with C2H5.
Let me know if this helps!
Explain why this substance is formed?
Explanation:
About which substance you are talking?
2. What is the molality of a solution in which 25 g of NaCl is dissolved in 20 kg of
water?
Answer:
0.21 m
Explanation
25 NaCl * 1 mole/58.44 g NaCl * 1/20 kg = 0.21 m
Drag each sequence to the correct location in the table.
Sort the sequences based on the type of mutation they display.
TATTA - TATTAGA
TATTCG TATTAAT
TATTAT TATTACG
ACGTATTC - ACGTTTC
ATTA GTAC - ATGT ACTA
GATCCAT - GATCCATCA
TACTTAGT TACTTGT
Deletion
Translocation
Insertion
Answer:
Does the picture go with the question?
Explanation:
A tank of gas is found to exert 8.6 atm at 38°C. What would be the required
temperature to change the pressure to standard pressure?
Answer:
36.2 K
Explanation:
Step 1: Given data
Initial pressure of the gas (P₁): 8.6 atmInitial temperature of the gas (T₁): 38°CFinal pressure of the gas (P₂): 1.0 atm (standard pressure)Final temperature of the gas (T₂): ?Step 2: Convert T₁ to Kelvin
We will use the following expression.
K = °C +273.15
K = 38 °C +273.15 = 311 K
Step 3: Calculate T₂
We will use Gay Lussac's law.
P₁/T₁ = P₂/T₂
T₂ = P₂ × T₁/P₁
T₂ = 1.0 atm × 311 K/8.6 atm = 36.2 K
PLEASE HELP IMMEDIATELY I NEED THE ANSWER NOT A HINT THANK YOU
Cytoplasm: gel like environment which allows organelles to move about the cell
Golgi bodies: packages and ships materials out of the cell
Cell membrane: controls what goes in and out of the cell
Chloroplast: makes food for plant cells using sunlight
Lysosome: breaks down waste, food, and worn out cell parts
Mitochondria: breaks down food to release energy for the cell
Nucleus: contains the cell's DNA and is the control center of the cell
Endoplasmic reticulum: transports materials within cell; process lipids
Vacuole: stores water, waste and food
Ribosome: make proteins
Does CO2+H2O----> C6H12O6+O2 demonstrate the Law of Conservation of Mass?
Answer:
Explanation:
-Reactants-
C: 1
O: 3
H : 2
-Products-
C: 6
O: 8
H: 12
Since these two are not equal, this reaction is not balanced.
Here is the balanced reaction:
6CO2+6H2O ⇒ C6H12O6+6O2
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Ammonium perchlorate (NH CIO 4) is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas (N2),
chlorine gas (Cl2), oxygen gas (22), water (H20), and a great deal of energy.
What mass of nitrogen gas is produced by the reaction of 9.64 g of ammonium perchlorate?
88
Round your answer to 3 significant digits.
olo
OO EXPLANATION
Answer:
idfk man but someone will HELP
Explanation:
1- N
2- Ne
3- Ar
4- P
A coin is 3.00% Cu by mass. If the mass of the coin is 4.0561g, how many moles of Cu does it contain
Answer:
4.0561×0.03÷63.5= 0.001916 mol cu
A coin is 3.00% Cu by mass. If the mass of the coin is 4.0561g, moles of Cu does it contain 0.001916 mole of Cu.
What is mass ?It is the most fundamental characteristic of matter and one of the fundamental quantities in physics.
Mass is a term used to describe how much matter is there in a body. The kilogramme is the SI unit of mass (kg). A body's mass does not alter at any point in time.
Given mass of coin = 4.0561g , moles =? , Cu by mass= 3.00%
4.0561×0.03÷63.5= 0.001916 mole Cu.
Thus, A coin is 3.00% Cu by mass. If the mass of the coin is 4.0561g, moles of Cu does it contain 0.001916 mole of Cu.
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6. What is the limiting reagent when 0.50 mol of Cr and 1.0 mol of H3PO4 react according to the following chemical equation?
2Cr + 2H3PO4 → 2CrPO4 + 3H2
If 0.20 mol of CrPO4 is recovered from the reaction described above, what is the percent yield?
What are prevailing winds
Answer:
a wind from the direction that is predominant at a particular place or season.
Explanation:
Brainlest is appriciated
Enter your answer in the provided box.
A 43.1−L volume of methane gas is heated from 24°C to 78°C at constant pressure. What is the final volume of the gas?
Answer:
V₂ = 50.93 L
Explanation:
Initial volume, [tex]V_1=43.1\ L[/tex]
Initial temperature, [tex]T_1=24^{\circ} C=24+273=297\ K[/tex]
Final temperature, [tex]T_2=78^{\circ} C=78+273=351\ K[/tex]
We need to find the final volume of the gas. The relation between the volume and the temperature is given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{43.1\times 351}{297}\\\\V_2=50.93\ L[/tex]
So, the final volume of the gas is 50.93 L.