Answer:
D) Trees
Explanation:
I'm sure its trees, because once you cut all trees you cant regenerate, or replenish them. hope im right, sorry of its wrong!!
wright it in 500 words Submit your persuasive essay about nuclear power. Remember to proofread your work before submitting.
Answer:
Explanation:
Introduction Paragraph. Hook. Background Points. Thesis Statement.( done)
Body Paragraph. Topic Sentence. Supporting fact 1. Supporting fact 2. Transition Sentence.(done)
Conclusion Paragraph. Re-statement of Thesis. Summary of Main Point. Challenge to the Reader.( done)
A sample of aluminum, which has a specific heat capacity of , is dropped into an insulated container containing of water at and a constant pressure of . The initial temperature of the aluminum is . Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has significant digit
Answer:
The answer is below
Explanation:
A 21.0 g sample of aluminum, which has a specific heat capacity of 0.897 J g '°C ', is dropped into an insulated container containing 200.0 g of water at 25.0 °C and a constant pressure of 1 atm. The initial temperature of the aluminum is 90.1 °C Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has 3 significant digits.
Solution:
The amount of heat lost or gained by a substance is given by the formula:
Q = mcΔT
Where Q is the heat lost or gained, m is the mass of the substance, ΔT is the temperature change.
The law of conservation of energy states that energy cannot be created or destroyed but can be transferred.
Therefore the heat lost by aluminum = heat gained by water
[tex]Q_{lost}=Q_{gained}\\\\m_ac_a\Delta T_a=m_wc_w\Delta T_w\\\\m_a= mass \ of\ aluminium = 21g,c_a=specific\ heat\ capacity\ of\ aluminum\\=0.897\ J/g^oC, \Delta T_a=90.1^oC-x,x=equilibrum\ temperature\\m_w= mass \ of\ water = 200g,c_w=specific\ heat\ capacity\ of\ water\\=4.184\ J/g^oC, \Delta T_w=x-25^oC\\\\ hence:\\\\21*0.897*(90.1-x)=200*4.184*(x-25)\\\\1697.2137-18.837x=836.8x-20920\\\\838.8x+18.387=1697.2137+20920\\\\857.187x=22617.2137\\\\x=26.4^oC[/tex]
Students investigate forces and how they affect objects. They use a small car and wooden blocks to carry out their investigation
They pushed the cart and blocks 10 times, using the same amount of force. Each time, they added 5 more blocks to the wagon
They measured how far the cart moves each time. They made a line graph to show their results. What will their graph show?
The distance the cart moves decreases as the number of blocks in it increases
As the number of blocks in the cart increases, the distance it moves stays the same.
The distance the cart moves is not related to the number of blocks in it
The distance the cart moves increases as the number of blocks in the cart increases
Answer:
increase the number of blocks
increase the number of students pulling the cart
increase the number of blocks and increase the number of students pulling the cart
decrease the number of blocks
decrease the number of students pulling the cart
decrease the number of blocks and decrease the number of students pulling the cart
(ANSWER CHOICES)
Explanation:
This is for science! I really need help.
Answer
Solid
liquid
Gas
Explanation:
Why is the combined gas law the most practiced gas law
Science
What part of all organisms Is involved in the exchanging of gases
Answer:
Gas exchange occurs in microscopic dead-end air-filled sacs called alveoli, where a very thin membrane (called the blood-air barrier) separates the blood in the alveolar capillaries (in the walls of the alveoli) from the alveolar air in the sacs.
Explanation:
Soda pop is carbonated with CO2. Mark puts one bottle of soda pop in the refrigerator and leaves the other out in the hot sunlight. After one hour, he opens both bottles. Which bottle will likely have more fizzing and bubbles? Why?
Answer:
The one left in the hot sunlight.
Explanation:
The solubility of gases decreases when temperature increases. The gas in the soda pop (CO2) left in the sun will not stay dissolved as much as the on left in the refrigerator.
Soda is a carbonated drink with soda or water and a sweetener. Soda pop in the fridge will have more fizzing and bubbles.
What is carbonated?Carbonated drinks are drinks or beverages that contain dissolved carbon dioxide. They have small bubbles and fizz of the carbon dioxide present in them.
Carbonation of the drinks is linked to the temperature as at high temperature, liquid tends to lose the carbon dioxide fizz. The carbon dioxide bubbles are retained at low temperatures as the solubility of the carbon dioxide is increased.
Therefore, the bottle kept in the refrigerator will have more bubbles and fizz.
Learn more about soda and carbonated here:
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2. How might this population suddenly increase? How might this affect the ecosystem? (for tropical savannah.)
Explanation:
it can suddenly increase when more and more people have babies and the infant rate goes up. and how it might affect the ecosystem is the pollution that people give off.
Answer:
Explanation:
Due to less predators in the Savannah/habitat, the population could unexpectedly grow. This will have an impact on the environment because it will give rise to more prey as there will be fewer predators. If too many herbivores are present on one feeding site, competition for food will occur. If there are more plants in an area than normal, it can increase the population of animals that consume the plant. If the population of one animal rises, the population of animals that consume that animal could also rise.
Population growth isn't always good. A population may often grow too big to sustain the climate. Other modifications in limiting variables can cause a population to decline. The population will decrease if a population becomes diseased, and the population of animals that consume the diseased animals will decrease as well. Populations in nature typically balance themselves. Sometimes, they can't always restore a natural balance as man affects populations.
What do sodium and magnesium have in common?
Answer:
daddy will help
Explanation:
uhhhhhhhhhhhhhhhhhhh
which properties represent a metal ( select all that apply )
a. malleable
b. shiny
c. dull
d. brittle
e. good conductors
What is the numerical value of the rate constant for a reaction in which [A] is reduced from 0.380 M to 0.215 M in a span of 26.3 s? Assume the units of the rate constant are s-1. Please enter your response to three of significant figures using E notation. For example, to report 1347.54 to three significant figures, type: 1.35E3
Answer:
k = 2.17E-2 s-1
Explanation:
Initial Concentration [A]o = 0.380 M
Final Concentration [A] = 0.215 M
time, t = 26.3 s
Unit of rate constant = s-1
Rate constant = ?
The units of the rate constant depends on the order of the reaction. This is a first order reaction due to the units.
The integral rate law for a first order reaction is;
ln[A] = ln[A]o - kt
ln(0.215) = ln(0.380) - k(26.3)
ln(0.215) - ln(0.380) = - k(26.3)
- k(26.3) = -0.57
k = 0.57 / 26.3 = 0.02167
Reporting to three significant figures using E notation;
k = 2.17E-2 s-1
The table shows the temperature and pressure of five-liter samples of four different gases. Which two gas samples do not have the
same number of molecules?
Answer:He2 & O2
Explanation:
Answer:
Answer:A
Explanation:
How many moles of a gas would be held by a 6 L container of nitrogen gas at 2 atm and 300 Kelvin?
Answer:
I think you would have to multiply 6 times 2, which it equals 12. And then just divide it by 300, and that's your answer. Hope I was able to help!
Explanation: Have a good day!
Which color marks the places on the map where the continental shelf is most likely found?
Answer:
blue
Explanation:
. If Kc is the equilibrium constant for a forward reaction, 2 A⇌ B, what is Kc' for the reaction 4 A⇌ 2B?
Answer:
(Kc)^2
Explanation:
For this reaction 4 A⇌ 2B Kc is (Kc)∧².
What is equilibrium constant?The equilibrium constant is the value of the reaction quotient that is calculated from the expression for chemical equilibrium. A thermodynamic equilibrium constant, denoted by , is defined to be the value of the reaction quotient Qt when forward and reverse reactions occur at the same rate. At chemical equilibrium, the chemical composition of the mixture does not change with time and the Gibbs free energy change. Stability constants, formation constants, binding constants, association constants and dissociation constants are all types of equilibrium constants.
Learn more about equilibrium constant, refer:
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Can someone answer this question please. Is this a physical change or chemical change?
Answer:
Chemical
Explanation:
the acid is a chemical and the molecules are getting torn apart by the acid
Classify each chemical reaction:
reaction
1. CH3CH2OH(f) → 3O2g + 2CO2 + 3H2Og
a. combination
b. precipitation
c. single replacement
d. combustion
e. double replacement
f. acid-base decomposition
2. MgI2 (aq) + Pb(NO3)2(aq) → Mg(NO3)2(aq) + PbI2(s)
a. combination
b. precipitation
c. single replacement
d. combustion
e. double replacement
f. acid-base decomposition
3. 16Ks + S8s → 8K2 + Ss
a. combination
b. precipitation
c. single replacement
d. combustion
e. double replacement
f. acid-base decomposition
4. CH4g + 2O2g → CO2g + 2H2Og
a. combination
b. precipitation
c. single replacement
d. combustion
e. double replacement
f. acid-base decomposition
Answer:
1) combustion
2) double replacement
3) combination
4) combustion
Explanation:
The combustion of a compound refers to the reaction of that compound with oxygen to produce heat and light. In reactions (1) and (4) above, ethanol and methane reacted with oxygen to yield carbon dioxde and water. This is a combustion reaction.
Reaction(2) is a double replacement reaction because the both cations exchange their anion partners in the product.
Reaction (3) is a combination reaction. It involves the joining of two elements to form a new compound.
What is the main purpose of the curiosity rover ?
Answer:
What is the main purpose of the curiosity rover ?
Explanation:
Curiosity's mission is to determine whether the Red Planet ever was, or is, habitable to microbial life. The rover, which is about the size of a MINI Cooper, is equipped with 17 cameras and a robotic arm containing a suite of specialized laboratory-like tools and instruments.
Answer:
Curiosity's mission is to determine whether the Red Planet ever was, or is, habitable to microbial life. The rover, which is about the size of a MINI Cooper, is equipped with 17 cameras and a robotic arm containing a suite of specialized laboratory-like tools and instruments.
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Q
1
The process by plant cells to use sunlight to create glucose is called Photosynthesi, cellular, active, passive, or osmosis
Answer:
PHOTOSYNTHESIS
Explanation:
Photosynthesis is the process by which plant take in Carbondioxde and water in the present of sunlight in order to produce glucose and oxygen
Hotter things have more energy than colder things. this is science middle school
Answer:
true
Explanation:
Hotter things have more heat energy than colder things. That's because the atoms or molecules move around faster in hot things (red, right) than they do in cold things (blue, left). ... The more heat you supply, the faster the molecules move and the further apart they get.
Answer: Depends on the situation.
Explanation: Hotter things do have more energy than colder things. But, if the mass of the colder thing is bigger, it really depends. If the colder thing have way more particles than the hotter thing, the colder thing may have more energy.
Radioactivity is a random Process, Why?
Explanation:
Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles (radiation). Decay is said to occur in the parent nucleus and produces a daughter nucleus. This is a random process, i.e. it is impossible to predict the decay of individual atoms.
HOPE THSI HELPS HAVE A NICE DAY!
For each element write the Noble gas notation
1. Oxygen
2. Calcium
3. Hydrogen
4. Copper
5. Neon
6. Cesium
Answer:
neon is the Noble gas but I have not studied this much
Balancing Equations Practice
Al(NO3)3 +
3 NH4NO3
(NH4)3PO4 → | AIPO4 +
1)
2)
AgF +
CaCl2 →
AgCl +
CaF2
3)
ZnBr2 +
Pb(NO2)2 →
Zn(NO2)2 +
PbBr2
help! help! plz Why do two H atams combine to Form the molecule H2 while He remains monotonic?
How atoms interact with other atoms is largely dependant on the number of electrons on its outermost layer. The electrons on this layer are called valence electrons.
As you might know, atoms have their electrons arranged in layers/shells, starting at k, l m, n etc. Each layer has a maximum number of electrons it can accommodate, with the outermost one being the valence shell. The first layer (k) can accomodate 2 electrons, the second one (l) can accomodate 8, as can the third one (m) etc.
As a rule of thumb, most atoms don't like being alone. These atoms have a valence shell that isn't saturated. This is the case for hydrogen(1), with one free slot in its outter shell.
However, atoms like helium are a bit different. They are inert, and don't need to bond with other atoms. This is because their valence shell is saturated. In this case, helium saturated the k shell with 2 electrons. Helium in this form will not form bonds.
However, hydrogen is still out there looking for buddies. Hydrogen will bind with any other atom with a free electron. Being extremely common, it's likely that said atom will be another hydrogen.
However, another common example would be for 2 hydrogens to bond with one oxygen, forming h2O (oxygen can form 2 bonds)
Conclusion : helium is inert and will not interact with other atoms. Hydrogen is not, and thus needs to bond with other atoms.
Plz help mee
Sandy soil
A) holds water well
B) contains clay and humus
C) has loose grains and few nutrients
A
think of this way: in Florida and many other costal places, people have sand in their backyards to limit flooding and things due to being so close to the ocean.
1. A globe is what kind of model?
interactive
mathematical
conceptual
visualization
Answer:
It's visualization.
Explanation:
Hope this helps :)
Solve the equation by first using the Quadratic Formula and then by factoring.
x2 – 14x + 48 = 0
what is the answer?!!?
Plzzzz help
Answer:
The planet would stop
Good luck!
Please help
Write a balanced equation for each chemical reactions. Include appropriate symbols. First reactant formula is given.
Hydrochloric acid (HCl) reacts with Zinc to form hydrogen gas and zinc chloride.
2 HCl +
Acetylene gas (C2H2) burns in a welding torch with oxygen to form carbon dioxide gas and water vapor. 2 C2H2 (g) +
c. Silver nitrate plus calcium chloride (CaCll2) yields silver chloride and calcium nitrate. 2 AgNO3 +
d. Oxygen gas combines with hydrogen gas to produce liquid water. O2 +
e. Hydrogen peroxide decomposes into oxygen gas and water when it contacts blood. 2 H2O2
a. [tex]\mathrm{2HCl_{(aq)} + Zn_{(s)}} \rightarrow \mathrm{H_{2(g)} + ZnCl_{2(aq)}}[/tex]
b. [tex]\mathrm{2C_2H_{2(g)} + 5O_{2(g)}} \rightarrow \mathrm{4CO_{2(g)} + 2H_2O_{(g)}}[/tex]
c. [tex]\mathrm{2AgNO3_{(aq)} + CaCl_{2(aq)}} \rightarrow \mathrm{2AgCl_{(s)} + Ca(NO_3)_{2(aq)}}[/tex]
d. [tex]\mathrm{O_{2(g)}+2H_{2(g)}} \rightarrow \mathrm{2H_2O_{(\ell)}}[/tex]
e. [tex]\mathrm{2H_2O_{2(aq)}} \rightarrow \mathrm{O_{2(g)} + 2H_2O_{(\ell)}}[/tex]
How many moles of tin atoms are in a pure tin cup with a mass of 30.4 g ?
Answer:
ANSWER: 0.331 moles of tin
Explanation: in my working * means multiply and ^ means to the power of.
Ok BASICALLY if you have 6.02*10^23 of something you have yourself 1 mole of things. The atomic weight in the left hand corner of each element in the periodic table gives you the MOLAR MASS, which is the mass of 1 mole of that element. For example, Carbon has a molar mass of 12.011, this means it has 12.011 grams every 1 mole of carbon [C] (12.011 g/mol)
So now, how many moles are in 39.3 grams of tin? Very easy. You will find that in chemistry classes students are taught a basic formula to find the number of moles, which is:
---
Number of moles = Mass given / Molar mass
---
So in order to answer this question and find out the NUMBER OF MOLES, we need to find the MASS GIVEN - this is simply the mass given to you in the question, which is 39.3 grams of tin. We also need to know the MOLAR MASS, which is found in the left hand corner of the element. For tin [Sn] the molar mass is 118.710.
Sub both these into the formula to get:
Number of moles = 39.3 / 118.710
Number of moles = 0.331058883
We are not finished - remember to round of the lowest amount of significant figures found in the working of the question. In the working out, which was (39.3 / 118.71) the 39.3 has 3 significant figures and the 118.70 has 5 significant figures. ALWAYS TAKE THE LOWEST AMOUNT FOUND. The lowest amount is 3, so we must round this answer to 3 significant figures.
It will be: 0.331
Therefore, 0.331 moles of tin atoms are in a pure tin cup with a mass of 39.3.
Hope i helped and good luck!