Answer:
FalseExplanation:
As we know that half life of any substance is constant. The ratio of parent to daughter atoms after one half life will be 1:1, then after the second half life further half of the first half will decay and will produce more daughter and reduce more parent and making the ratio 1:3, the ratio after 3rd half life will be 1:7, then 1:15 and so on.
Let's suppose that we are given with 100 g of radioactive substance and we are calculating the mass of parent and daughter atoms after every half life as;
1/2 life Mass of Parent Mass of Daughter Ratio
0 100 g 0 100:0
1 50 50 1:1
2 25 75 1:3
3 12.5 87.5 1:7
4 6.25 93.75 1:15
When a substance gains or loses energy, it’s _____ changes, or its _____ chafes. Theses two changes do ___happen at the time ; the temperature remains ___until the change of ____is complete.
Answer:
When a substance gains or loses energy, its temperature or state changes. These two changes do not happen with respect to time; the temperature remains the same until the change of state is complete.
Explanation:
This statement is about energy and change of the state of the matter. By gaining or losing energy, the physical state of the matter can change into one another. Melting, freezing, condensation, evaporation, sublimation, and deposition are the processes that support to change the physical state of the matter. Change in state and change in the matter do not happen at the same time. A substance gains or loses energy to reach a specific temperature and remains constant until the physical change of matter is completed.
N2+3H2-2NH3
calculate the number of grams of NH3 are formed when 3.0 mole of N2 is reacted with 6.7 moles of H2
102 grams of ammonia is formed when 3 moles of nitrogen and 6.7 moles of hydrogen reacts.
Explanation:
The equation given is of Haeber's process in which the nitrogen is limiting factor in the ammonia formation and hydrogen if in excess gets delimited.
We know that 1 mole of Nitrogen gives 2 moles of ammonia.
We have 3 moles of nitrogen here,
So, 6 moles of ammonia will be form
so from the formula
no of moles=mass/atomic mass
mass= no. of moles*atomic mass
= 6*17
= 102 grams of ammonia will be formed.
So, 6 moles or 102 grams of ammonia is formed when 3 mole of nitrogen and 6.7 mole of hydrogen reacts.
are pigs really bacon or is bacon artificial
Answer:
it’s artificial
Explanation:
Answer: BACON
Explanation:
What term means that the state of matter stays the same
Answer:
answer is solid
Explanation:
solid always is hard and can never change yet liquid and gas can move
The term 'phase' refers to the state of matter staying the same, and there are three main phases: solid, liquid, and gas. In a solid, the particles are in fixed positions and maintain a fixed volume and shape. The law of conservation of matter states that the total amount of matter remains constant during phase transitions.
The term that means the state of matter stays the same is phase. Matter exists in one of three main states, namely solid, liquid, and gas. In the solid phase, atoms or molecules do not have enough energy to move past each other and are in fixed positions with strong intermolecular forces; thus, they maintain a fixed volume and shape. The liquid phase has atoms or molecules that are constantly in contact yet have enough energy to move freely relative to one another, allowing the liquid to take the shape of its container while maintaining a definite volume. The gas phase is characterized by particles that are separated by relatively large distances and that fill the volume of their container.
In any closed system, the law of conservation of matter dictates that no detectable change in the total amount of matter occurs during the transition from one phase to another. Thus, when matter undergoes a phase change, its state may alter, but the total quantity of matter remains constant within a given system.
Which element in Period 5 is the most active metal? Fr H Rb Sr
Answer:
RB
Explanation:
Rubidium is the first element placed in period 5 and is the most active metal.
Answer:
The answer is: Rb
Hope this helps :) <3
Explanation:
44.2124+0.81+7.335 significant digits
Answer:
44.2124+0.81 = 45.0224 + 7.335 = 52.3574
Use the ideal gas law to calculate the pressure in atmospheres of 0.214 mol of Helium (He) at 61°C & occupying 2.53 L. You must show all of your work to earn credit. **Don't forget to convert your Celsius temperature to Kelvin. ** (4 points)
PLEASE HELP ASAP!!!!! WILL GIVE BRAINLIEST!!!!!
Pressure is 2.32 atm.
Explanation:
Ideal gas law is given as, PV = nRT
P represents pressure, V represents volume, T represents, temperature in Kelvin, R is nothing but the gas constant, its value is 0.08206 L atm mol⁻¹K⁻¹.
n represents the number of moles.
We have to convert temperature in Kelvin by adding 273 K to the given temperature in Celsius.
Temperature = 61°C + 273 K = 334 K
Plugin the values in the above equation as,
P = [tex]\frac{nRT}{V}[/tex]
= [tex]\frac{0.214 mol \times0.08206 L atm/mol K\times 334 K }{2.53L}[/tex]
= 2.32 atm
(g/mo)
Your answer
0 This is a required question
Using the balanced chemical equation below, how many moles of methane 1 point
will react to produce 3.2 moles of water? *
** Answer in numerical numbers only. Do not include units. (answer MUST include the correct
number of significant figures for *ANY* credit)
CH4 + 20, → CO2 + 2H,0
Your answer._______
Answer:
1.6mol
Explanation:
CH4 + 2O2 → CO2 + 2H20
From the equation,
1mole of CH4 reacted to produce 2moles of H2O.
Therefore Xmol of CH4 will react to produce 3.2moles of H2O i.e
Xmo of CH4 = 3.2/2 = 1.6mol
Therefore, 1.6mol of CH4 will react to produce 3.2moles of H2O
How many miles of silver nitrate do 2.888 x 10^15 formula units equal?
Answer: 4.8x10^-9 mol
Explanation:
1mole of Silver nitrate contains 6.02x10^23 molecules
Therefore, Xmol of silver nitrate will contain 2.888x10^15 molecules i.e Xmol of silver = 2.888x10^15/6.02x10^23 = 4.8x10^-9 mol
100 points bc why not :P Which statement best describes heating by radiation?
Sunlight travels through space without the aid of fluids or solids.
Warm air rises and takes heat with it; eventually it cools and sinks.
Air molecules touch the warm ground, heating them up.
Air at the equator rises and sinks at the poles.
Answer:
Sunlight travels through space without the aid of fluids or solids.
Explanation:
By definition, radiation is transfer of heat without a medium.
All other options are have convection involved in them, not radiation.
Answer:
Sunlight travels through space without the aid of fluids or solids
Explanation:
Potassium is isotopic and has RAM of 39.5 work out the percentage abundance of each isotope in a given sample of potassium which is found to contain 3 isotopes of K-39, K-40 and K-38 with the abundance of K-38 being 0.01%
Yo sup??
Let the percentage of K-39 be x
then the percentage of K-40 is 100-(x+0.01)
We know that the net weight should be 39.5. Therefore we can say
(39*x+40*(100-(x+0.01))+38*0.01)/100=39.5
(since we are taking it in percent)
39*x+40*(100-(x+0.01))+38*0.01=3950
39x+4000-40x-0.4+0.38=3950
2x=49.98
x=24.99
=25 (approx)
Therefore K-39 is 25% in nature and K-40 is 75% in nature.
Hope this helps.
Calculate the percent ionization of a 0.447 M solution of nitrous acid
I hope this will help :)
Choose the correct words.to complete the statements about career planning.
Throughout your job search, you’ll find that is closely related to the career of your choosing. It’s important to take the time to find out what to expect now, so you can start developing the you need to excel in that career.
HELPPPP PLEASE
Correct Question Format:
Throughout your job search, you’ll find that
A the economy
B education
C salary
is closely related to the career of your choosing. It’s important to take the time to find out what to expect now, so you can start developing the
A task
B communication
C skill
that you need to excel in that career.
Answer:
Throughout your job search, you’ll find that education is closely related to the career of your choosing. It’s important to take the time to find out what to expect now, so you can start developing the skill that you need to excel in that career.
Explanation:
At the time of attending our interview, we find that the question raised from an interviewer related to the choosing of the field and from our educational background. So, it clearly based on what we learn via our education and how we can get connected to the selected field but not based on our salary or an economy.
Similarly, it is essential to make a note about the requirement from the chosen field and have to prepare our skill accordingly. It means that required to develop the knowledge related to our selective field and should be presented in a connected way in front of an interviewer.
Throughout your job search, you'll find that which is closely related to the career of your choosing. It's important to take the time to find out what to expect now, so you can start developing the skill you need to excel in that career. Furthermore, volunteering in societal development will go a long way in giving you a stand among your peers. Finally try to connect to the people in your field to know the right person to guide you to succeed
Simplify this expression 1-c+4c-29
Answer:
1-c+4c+c=-28+3c
Explanation:
since,the expression can be solved,solve it and gain your answer.Don't truly trust me though.
Final answer:
The expression 1-c+4c-29 is simplified by combining like terms to get 3c-28.
Explanation:
The expression provided by the student is 1-c+4c-29. To simplify this expression, we combine like terms. The terms that contain 'c' can be combined, and the constants can also be combined. We start by adding together the coefficients of 'c', which gives us 3c (since -c + 4c = 3c). Then, we combine the constants 1 and -29, which gives us -28. So simplified, the expression is 3c - 28.
One half of a balanced equation chemical equation is shown
3Mg(OH)2+2H3PO4
Answer:
the answe is A.)
Explanation:
hope this helps
your welcome
Which of the following set ups which converts centimeters to fit
Answer:
The fourth one down
Explanation:
It is the only setup in which the units of "cm" and "in" cancel correctly and give the desired units of "ft."
The second one down has the correct units but the wrong conversion factor for converting centimetres to inches.
The student is asked to use dimensional analysis for unit conversion within the metric system, such as converting meters to centimeters using a ratio or conversion factor.
Explanation:The question asks for the conversion of centimeters to fit, which appears to be a typo and should likely refer to converting measurements within the metric system. Specifically, the task involves applying dimensional analysis to convert lengths from one unit to another, such as meters to centimeters or vice versa.
Steps for Conversion Using Dimensional Analysis
Identify the provided measurement and its unit.
Determine the unit you need to convert to.
Set up a conversion factor, which is a ratio representing the relationship between two units.
Multiply the given measurement by the conversion factor to get the answer in the desired unit.
For example, to convert 1.5 meters to centimeters, you set up the proportion: 100 cm/1 m = x cm/1.5 m. By cross multiplying and solving the proportion, you find that x = 100 × 1.5 cm, which equals 150 cm.
Learn more about Dimensional Analysis here:https://brainly.com/question/30303546
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what information can be learned about atoms of different elements by examining the periodic table
Answer:
The periodic table tells you the atomic number (which tells you the number of protons and electrons). It also includes the mass number, which is the sum of the protons and neutrons in the nucleus of an atom.
The periodic table provides information about the atomic number, atomic mass, electron configuration, group, and period of elements, allowing you to learn about atoms of different elements.
Explanation:By examining the periodic table, you can learn important information about different elements and their atoms. The periodic table provides information about the atomic number, symbol, atomic mass, and electron configuration of each element. For example, the atomic number tells you the number of protons in an atom, while the electron configuration gives you information about the arrangement of electrons in different energy levels. Additionally, the periodic table also allows you to determine the group and period of an element, which can provide insights into its chemical properties.
Learn more about Information about atoms of different elements from the periodic table here:https://brainly.com/question/34268652
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Air temperatures change with changing heights, or altitudes, in the Earth's atmosphere. Gathering accurate data about the temperatures at different altitudes is important for predicting which of the following?
A.
when and where lightning is likely to strike
B.
if precipitation will take the form of snow, sleet, hail, or rain
C.
when and where a tsunami is likely to strike a coastline
D.
how much carbon dioxide is in the atmosphere at a particular location
B
Gathering accurate data about the temperatures at different altitudes is important for predicting if precipitation will take the form of snow, sleet, hail, or rain.
Explanation:
Usually, temperatures lower with altitude the reason clouds form when a warm humid air mass rises into the upper atmosphere. The moisture condenses into clouds in the upper atmosphere that precipitate as rain. However, when the upper atmosphere is even cooler, other types of precipitation like hail and snow will form. Hail forms when the cloud water droplet freezes to ice and coalesce while snow is more or less individual cloud water particles that are frozen. Studying the temperatures of the upper troposphere can help determine what kind of precipitation to expect.
Answer:
B.
if precipitation will take the form of snow, sleet, hail, or rain
Explanation:
30. a. How do the properties of metals differ from those
of both ionic and molecular compounds?
b. What specific property of metals accounts for their
unusual electrical conductivity?
Answer:
Explanation:
A. Metals are shiny, usually solid at room temperature, malleable, ductile, and highly conductive. In contrast, ionic compounds are brittle. Molecular compounds are often gases at room temperature.
b. Metals have very few valence electrons. Their outermost p-orbitals are empty. This allows their electrons (including those from their d-orbitals) to move freely between metal atoms. The movement of electrons is electricity, so this mobile "sea of electrons" is what causes metals' conductivity.
Name two physical properties that characterize matter.
Answer:
Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.
Explanation:
Answer:
Matter is anything that has mass and occupies a space. Matter has 2 properties physical properties and chemical properties. And 2 physical properties include mass and shape (solid, liquid and gas).
Other physical properties of molecular matter include:
Volume
Color
Odor
Luster
Hardness
Melting Point
Freezing Point
Boiling Point
Density
Malleability
Ductility
Conductivity
375centimetercube of a gas has a pressure of 770mmHg.find it's volume if the pressure is reduced to 750mmHg
Answer: 385cm3
Explanation:
V1 = 375cm
P1 = 770mmHg
P2 = 750mmHg
V2 =?
P1V1 = P2V2
770x375 = 750xV2
V2 = (770x375) /750
V2 = 385cm3
If a disease caused one-fourth of the deer population to die, how would the rabbit population most likely be affected?
The rabbit population would get larger because of decreased competition with the deer population
The rabbit population would get smaller because of increased competition with the deer population
The rabbit population would get smaller because of decreased competition with the deer population
The rabbit population would get larger because of increased competition with the deer population
The correct answer is option c)The rabbit population would get smaller because of decreased competition with the deer population.
The likely impact of a disease causing one-fourth of the deer population to die on the rabbit population can be understood through the ecological dynamics within the food web. Deer and rabbits share the same trophic level as herbivores, both relying on producers like grass and plants for sustenance. If a disease significantly reduces the deer population, it would result in decreased competition for resources, particularly food, among herbivores.
In this scenario, option C is the most plausible: "The rabbit population would get smaller because of decreased competition with the deer population." With fewer deer consuming the same resources, such as plants and grass, the rabbits may experience a decline in competition for these food sources. This might lead to an apparent reduction in the rabbit population.
It's crucial to consider the intricate connections in the ecosystem. While decreased competition might initially benefit the rabbit population, other factors such as changes in predator-prey relationships or alterations in the vegetation structure could influence the long-term dynamics.
Therefore, due to decreased competition for resources with the declining deer population, the rabbit population is likely to get smaller (Option C).
Animals have learned and innate behavioral adaptations.
Which example is a learned behavioral adaptation of an animal?
O a stickback behaving aggressively
O spiders building webs
O birds building nests
O lions hunting for food
Final answer:
Lions hunting for food is an example of a learned behavioral adaptation, while the other provided options (stickleback behavior, spider web building, and bird nest building) represent innate behaviors.
Explanation:
When considering the examples provided, one stands out as a learned behavioral adaptation, and that is lions hunting for food. Unlike the other examples that are innate behaviors, lions have to learn and perfect their hunting techniques through experience. Spiders building webs, sticklebacks behaving aggressively, and birds building nests are all examples of innate behaviors, which don't vary significantly among individuals of the same species and do not require learning.
Learned behaviors, such as habituation and imprinting, are crucial to the survival and adaptation of animals as they can adjust their actions based on environmental cues and past experiences.
total water content in the earth remains constant. comment upon the following
Answer:
The total water content in the earth remains nearly constant.
Explanation:
The amount of water on earth is nearly same as the amount of water that was on earth in Mesozoic era.Plants and animals use water as a raw material in their growth, but that water is eventually returned to earth.When the UV light breaks the water molecules in higher atmosphere, some water is lost.But it is compensated by the water that enters the earth through meteors and comets.The water content is not constant but through the series of biochemical reactions,the water level is nearly the same.Answer:
the water is constant
:(
Explanation:
Which should be kept away from heat sources? Check all that apply.
answer choices:
1 fire blanket
2 loose hair
3 chemicals marked
4 flammable clothing
5 water sources
Answer:
loose hair, flammable clothing, and all stored chemicals especially flammable liquids., should be kept away from heat.
A fire blanket is a highly flame-resistant blanket that can be used to extinguish a small fire or to wrap around a person in case of a fire and water helps put it out too.
Answer:
A.)fire blanket
Explanation:
What happens to the biomass as energy decreases up the food pyramid?
Answer & Explanation:
Energy is transferred throughout the food chain as animals at lower trophic levels are consumed by those at higher trophic levels. ... Therefore, at each stage of the food chain, less energy and biomass is transferred between organisms than at the previous trophic level.
i love your pfp
Calculate the molar mass of a gas if an 8.06×10(to the power of -2) gram sample of it occupies .0650 L at 547°C and 70.5 kPa
Answer:
M.Mass = 120 g/mol
Explanation:
Data Given:
Volume = V = 0.0650 L
Temperature = T = 547 °C = 820.15 K
Pressure = P = 70.5 kPa = 0.695 atm
Gas Constant = R = 0.082057 L.atm.mol⁻¹.K⁻¹
Formula Used:
Assuming that the gas is ideally then according to ideal gas equation,
P V = n R T
Solving for n,
n = P V / R T
Putting Values,
n = (0.695 atm × 0.0650 L) ÷ (0.082057 L.atm.mol⁻¹.K⁻¹ × 820.15 K)
n = 6.71 × 10⁻⁴ moles
Now, Knowing that,
Moles = Mass / M.Mass
Or,
M.Mass = Mass / Moles
Putting values,
M.Mass = 8.06 × 10⁻² g / 6.71 × 10⁻⁴ mol
M.Mass = 120 g/mol
The volume of helium in a blimp is 6.28 × 109 milliliters. The density of helium in the blimp is 0.1786 . Find the mass of the helium in the blimp.
Hey There!:
Density = mass / volume
Density of helium in the blimp = 0.1786 kg/m³
Volume of helium in the blimp = 6.28 x 10⁹ mL
converting the volume in m³ :
1 m³ -------------------------------- 1 x 10⁻⁶ m³
Volume( m³ ) -------------------- 6.28 x 10⁹
Volume ( m³ ) = ( 6.28 x 10⁹ ) x 1 / ( 1 x 10⁻⁶ )
Volume ( m³ ) = ( 6.28 x 10⁹ ) / ( 1 x 10⁻⁶ )
Volume ( m³ ) = 6280 m³
Therefore:
D = m / V
0.1786 = m / 6280
m = 0.1786 x 6280
m = 1121.608 g
converting in Kg :
1 kg ------------------ 1000 g
?? --------------------- 1121.608 g
mass = 1121.608 x 1 / 10000
mass = 1121.608 / 10000
mass = 1.12 x 10⁶ g
Hope that helps!
Final answer:
To find the mass of helium in the blimp, multiply the volume of helium ([tex]6.28 * 10^9[/tex] milliliters) by the density (0.1786 g/mL). This results in a mass of approximately [tex]1.121768 * 10^9[/tex] grams.
Explanation:
The question asks us to calculate the mass of the helium in the blimp given its volume and density. To find the mass, you need to use the formula: mass = volume × density.
In this case, the volume of helium is 6.28 × [tex]10^9[/tex] milliliters and the density of helium is 0.1786 grams per milliliter. So, you would calculate the mass as follows:
mass = 6.28 × [tex]10^9[/tex] mL × 0.1786 g/mL
mass = 1.121768 × [tex]10^9[/tex]grams
The mass of helium in the blimp is therefore approximately 1.121768 × [tex]10^9[/tex] grams.
Which of the following is the first stage of the photo-independent reaction?
carbon cycle
carbon fixation
carbon sink
carbon source
Answer:
i believe the answer is b.) carbon fixation
A is a violent cyclonic storm that forms out at sea in the tropics near the . The tropical climate has air which provides the right conditions. This area experiences an in evaporation between June and November from the warm ocean waters which fuel this type of storm. This type of storm loses some of its strength and will weaken when it moves across .
this is sci
Answer:
Tropical Cyclone or Hurricane
Explanation:
Tropical Cyclone or Hurricane is a violent cyclonic storm that forms out at sea in the tropics near the . The tropical climate has air which provides the right conditions. This area experiences an in evaporation between June and November from the warm ocean waters which fuel this type of storm. This type of storm loses some of its strength and will weaken when it moves across .