Answer:
i believe its the role of the antagonist
Explanation:
Why is Carbon not used as a refactory material
Answer:
Probably because of the dangers
Explanation:
Carbon when emitted causes large damage to the air, so it would be risky because of both the impact on the environment and the consequences the government would give them. It could also be because Carbon isn't durable enough to be burned as a refractory material.
Name the four states of matter, and a characteristic to describe each.
Answer:
solid particles are tightly held.
liquid particles have perfectly inelastic collisions
gas move in constant random motion
vapour
pls do in 1 hour!!!!!!!
Answer:
c) burrow underground
a) false
a) save rain water
c) prevent animals eating it
Instead of leaves, most cacti have spines or scales (which are modified leaves). These spines and scales do not lose water through evaporation (unlike regular leaves, which lose a lot of water). The spines protect the cactus from predators (animals that would like to eat the cactus to obtain food and/or water).
b) false
What abiotic factors do humans need?
The most important abiotic factors include water, sunlight, oxygen, soil and temperature. Water (H2O) is a very important abiotic factor – it is often said that “water is life.” All living organisms need water. In fact, water makes up at least 50% of almost all living things
pls answer properly I will rate 5 and brainlist just answer properly and I need it now just answer what you know in the question
Answer:
Fire is a chemical hazard, because of explosives and nukes. Falling debris is physical, difficulty breathing is a biological hazard, and fungi, pesticides, and cockroaches are biological as well. Muriatic acid is chemical, so is bleach. And any vibrations and noises or corrosion are physical.
How fire differ from flame?
[tex]brainlyeveryday[/tex]
Answer:
=> Fire is a rapid oxidation of any substance or material. It is a exothermic chemical process of combustion.
=> Flame is a visible, gaseous region of a fire.
Suppose you have a sample of table salt (NaCl) that has a mass of 100.0 grams. If
this amount of salt is added to a large beaker and filled with water until the total
volume is 2 liters, what is the concentration of this solution in units of Molarity?
Please do not include any units in your answer.
Taking into account the definition of molarity, the concentration of the solution is 0.855 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of NaClIn this case, you have:
number of moles of NaCl= [tex]100 grams\frac{1 mole}{58.45 grams} =[/tex]1.71 moles (being 58.45 g/mole the molar mass of NaCl)volume 2 LReplacing in the definition of molarity:
[tex]Molarity=\frac{1.71 moles}{2 L}[/tex]
Solving:
Molarity= 0.855 [tex]\frac{moles}{liter}[/tex]
Finally, the concentration of the solution is 0.855 [tex]\frac{moles}{liter}[/tex].
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Denaye drives 25 km to work every day along the route tgere is a traffic light every 5,000 meters. How many traffic lights does denaye pass on her way to work
Answer:
5
Explanation:
1km = 1,000m
5km = 5,000m = 1 light
25/5 = 5
Based on what you learned in the video, draw a model that shows how weathered rock turns into sedimentary rock. Use the paragraph above to guide you, and label all parts of the process. Mark the location of highest pressure.
Answer:
This is what it looks like! Mark brainliest if u think im right <3
Explanation:
Weathering and erosion on the Earth's surface break down volcanic rock becoming pebbles, sand, as well as mud, resulting in sedimentary rock.
What is sedimentary rock?Sedimentary rock, rock generated at or near the Earth's surface as a result of sediment deposition and lithification or precipitation into solution at typical surface temperatures.
Sedimentary rocks are among the most frequent on the Earth's surface, although they make up just a minuscule portion of the crust, which would be dominated by metamorphic and igneous rocks.
Weathering and erosion on the Earth's surface break down volcanic rock becoming pebbles, sand, as well as mud, resulting in sediment that collects in basins just on Earth's surface. The image for the formation of sedimentary rock is given below.
Therefore, weathering and erosion on the Earth's surface break down resulting in sedimentary rock.
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Why does a floating leaf indicate photosynthesis has occurred
which 19th- century art movement most directly influenced the development of abstract art in the 20th century?
A: Realism
B: Romanticism
C: Impressionism
D: Post-Impressionism
Answer:
B.
Thank goodness for all the help you can
Explanation:
Basta
12.
Which of the following does not indicate that a chemical reaction occurred when the iron filings
were added to the copper(II) sulfate?
You didn't provide the answer choices so I'll give all that I know.
No color change occurs
No odor is produced
No gas is produced
No temperature change occurs(Stays at room temp)
No precipitation occurs
5.00 kg glycol, Ca(OH)2. [this is antifreezel] is added to your radiator. If your radiator contains 12.0 kg
of water, what would be the freezing point of the water-antifreeze mixture? The molal freezing point
depression constant for water is 1.86 'C.kg/mole.
The freezing point is mathematically given as
ft=-12.5C
What would be the freezing point ?Question Parameters:
5.00 kg glycol, Ca(OH)2. [this is antifreeze] is added to your radiator. If your radiator contains 12.0 kg
The molar freezing point depression constant for water is 1.86 'C.kg/mole.
Generally the equation for the Freezing point is mathematically given as
ft=k f [tex]\frac{wB}{Mb}*1000/Wa[/tex]
Therefore
0-ft=1.89*5000.62*1/12
ft=-12.5C
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2 SO2(g) + O2(g) + 2 H2O(ℓ) −→ 2 H2SO4(ℓ)
What mass in grams of SO2 is needed to
react with 1527 g of O2?
Answer:
6116g
Explanation:
2SO2(g) + O2(g) + 2H2O(ℓ) −→ 2H2SO4(ℓ)
We want to find the mass in grams of SO2 that is needed to react with 1527 g of O2. First we must convert the grams of O2 to moles of O2 then to moles of SO2 and then to grams of SO2
So first lets find the molar mass of O2
The mass of oxygen according to a periodic table is 15.999
Using this the mass of O2 would be 15.999(2) = 31.988g
Next we need to identify the mole ratio of O2 to SO2
Looking at the equation for 1 mole of O2 there are two moles of SO2
Next we need to find the molar mass of SO2
Again the mass of oxygen is 15.999g and the mass of Sulfur is 32.066
So the mass of SO2 would be 15.999(2) + 32.066 = 64.064g
Now that we have found all the needed conversions :
1 mol O2 = 31.988g 1 mol O2 = 2 mol SO21 mol SO2 = 64.064gWe can now use dimensional analysis to calculate the answer.
Kindly check the attached image to see the table. ( sorry if its a bit blurry )
Explanation : The conversions are used to cancel out the units to get to the final unit which is gSO2.
Once the units are cancelled out except for the gSO2 we mutliply and divide based off of what the table says to do.
Here first we divide 1527 by 31.988. We than multiply by 2. Finally we multiply by 64.064 to get the final answer which is 6116gSO2
when methane reacts with oxygen, the products are carbon dioxide and water. How many grams of carbon dilxide are formed if 30 g of methane react completely with 75 g of oxygen to form 50 g of water?
Answer:
CH4+2O2→CO2+2H2O
Moles of oxygen=3232=1
Moles of carbon dioxide=4422=0.5
Moles of water=1818=1
1 mole of methane reacts with 2 moles of oxygen to give 1 mole of CO2 and 2 moles of water so 0.5 mole of methane will be required which is equal to 0.5×16=8g.
Explanation:
8g
Please see the attached file and answer. I need this ASAP!
Giving Brainliest!
Answer:
Answer no. 2
Explanation:
Distillation is the process of separating consistent solids from a liquid mixture
CK12 Stoichiometry and Thermochemical Equations
4/10
Use the following thermochemical equation:
2Na(s) + Cl2(g) + 2NaCl(s) + 822 kJ
A certain reaction releases 471 kJ of heat. What mass of NaCl
was produced in the reaction?
The mass of sodium chloride (NaCl) produced from the reaction when 471 KJ of heat is released is 67.04 g
Balanced equation2Na + Cl₂ —> 2NaCl ΔH = + 822 kJ
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g
SUMMARY
From the balanced equation above,
When 822 KJ of heat is released, 117 g of NaCl were produced.
How to determine the mass of NaCl producedFrom the balanced equation above,
When 822 KJ of heat is released, 117 g of NaCl were produced.
Therefore,
If 471 KJ of heat is released, then = (471 × 117) / 822 = 67.04 g of NaCl will be produced
Thus, 67.04 g of NaCl were obtained from the reaction
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when acid reacts with Base what result
Strong Acid + Strong Base = Neutral Salt + H2O
Strong Acid + Weak Base = Acidic Salt + H2O
Weak Acid +Strong Base = Basic Salt + H2O
Find the percent nitrogen in ammonium oxide.(Answer = 53.8%)
Answer:
6. 36.7%
Explanation: 7. 21.2% 8. 48%
Determine how many ml of water you need to remove, by evaporation, if you have a 500 ml of 10.20 M HNO3 dilute solution and you need to make it a 12 M HNO3 stock solution.
The total volume of water that would be removed will be 75 mL
Dilution equationUsing the dilution equation:
M1V1 = M2V2
In this case, M1 = 500 mL, V1 = 10.20 M, M2 = 12 M
Substitute:
V2 = 500 x 10.20/12
= 425 mL
The final volume in order to arrive at 12 M HNO3 would be 425 mL from the initial 500 mL. Thus, the total amount of water that will be removed by evaporation can be calculated as:
500 - 425 = 75 mL
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A 35.3g of element M is reacted with nitrogen to produce 43.5g of compound M3N2.what is (i) the molar mass of the element (ii) Name.of the element
The molar mass of M is 40.2 g/mol and the name of the element is Calcium.
35.3g of element M reacted with nitrogen to produce 43.5g of compound M3N2.
Chemical reaction3M + N₂→ M₃N₂
Therefore,
let the molar mass of element = x
35.3 g of M = 43.5 g of M₃N₂
3x g of M = 3x + 28
cross multiply
35.3(3x + 28) = 43.5(3x)
105.9x + 988.4 = 130.5x
988.4 = 130.5x - 105.9x
988.4 = 24.6x
x = 988.4 / 24.6
x = 40.1788617886
x = 40.2
Therefore, the molar mass of M is 40.2 g/mol and the name of the element is Calcium.
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which of the following substances is formed deep under earth
Answer:
Oil
Explanation:
everything else is above the earth
2 NO(g) + O2(g) → 2 NO2(g)
How many grams of NO2 can be produced when 25.0 g of nitrogen oxide reacts?
25g/30.01g = 0.83 moles
0.83(2/2) = 0.83 moles
0.83*46.005 = 38.2 grams
Answer:
2No+O2 gives 2No2
2 moles of No gives 2 moles NO2
Moles of No= 1.20/30=0.04
Moles = 0.04 ✖ 46=1.8 moles
Which subatomic particle cannot change in an atom?
Proton, Neutron, Electron
Answer: Protons cannot change in an atom because that would change the identity of a particle. Electrons on the other hand can be added or removed creating an ion. Neutrons can also be added or removed to create an isotope.
The following questions refer to the equilibrium shown here:
4NH3(g) + 5O2(g) <-> 4NO(g) + 6H2O(g)
For a certain reaction at 25.0°C, the value of K is 1.2 × 10–3. At 50.0°C the value of K is 3.4 × 10–1. This means that the reaction is:
a. Never favorable
b. More information needed
c. Endothermic
d. Exothermic
e. None of the above
The value of K changes, affected by temperature
Endothermic (ΔH = +): temperature rises ⇒ K increases
Exothermic (ΔH = -): temperature increases ⇒ K decreases
From the data in the problem, the value of K increases in proportion to the temperature, then the reaction is said to be endothermic (C)
HELPPPPP How is precipitation related to high- and low-pressure air? A) High-pressure systems lead to rain B) Low-pressure systems lead to rain. C) Both high- and low pressure systems lead to rain. D) Neither high- nor low-pressure systems lead to rain
Why? Because high-pressure systems don't allow vapor to get high enough to "become clouds," therefore it will not rain. :)
~pinetree
Balance this equation:
C₂H₂ + O₂
---->
CO2 + H2O
Answer:
Balance The Equation: C2H2 + O2 = CO2 + H2O
1. Label Each Compound With a Variable
aC2H2 + bO2 = cCO2 + dH2O
2. Create a System of Equations, One Per Element
C: 2a + 0b = 1c + 0d
H: 2a + 0b = 0c + 2d
O: 0a + 2b = 2c + 1d
3. Solve For All Variables (using substitution, gauss elimination, or a calculator)
a = 2
b = 5
c = 4
d = 2
4. Substitute Coefficients and Verify Result
2C2H2 + 5O2 = 4CO2 + 2H2O
L R
C: 4 4 ️
H: 4 4 ️
O: 10 10
which of the following spheres is likely to represent a metal atom? WHich
Answer:
Metals lose electrons when reacting with nonmetals, so the red sphere represents a metal.
If you repeated this experiment with a different concentration of hydroxide ion, would
you expect to find the same order with respect to crystal violet or a different one?
Briefly explain.
We see the order with respect to crystal violet (m),but no longer the order with respect to hydroxide (n).
Concentration of hydroxide ion equationGenerally the equation for the chemical reaction is mathematically given as
(CV)+(aq) + (OH)-(aq) ------------>. CVOH(aq)
The rate law for the chemical reaction is given as
Rate = k[CV+]m[OH-]n,
Because the hydroxide ion conc is an extra of thousand times as massive as the conc of crystal violet, [OH–] will now not exchange drastically all through this experiment.
Therefore, you will find the order with respect to crystal violet (m),but no longer the order with admire to hydroxide (n).
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what is one advantage of doing a feild experiment instead of a laboratory experiment
Answer:
Field experiments can often have the potential to give scientists opportunities that are not possible in a lab setting.
Explanation:
Having people "act natural" in a lab setting is impossible to truly achieve, as we all know what happens to our mental state and behavior when we are being actively observed. This is also especially helpful when conducting wildlife research, as there are a myriad of different things influencing animal and plant behavior that would be nigh impossible to recreate perfectly in a controlled lab setting.
Field research can have its disadvantages as well, as it is very hard to only have one thing change (make an independent variable) in a wild environment with ever-changing weather, social effects, etc. Also, you, as the researcher, as causing an impact on the very location that you are observing, which can alter your results in unpredictable ways.
The thing to remember is that each type of study has its advantages and disadvantages; if they didn't, then we'd all do the same type of research! You have to weigh your research options and figure out which one works best for your situation :)
_____ resources are resources that cannot be replenished within a lifetime.
Question 1 options:
Nonrenewable
Renewable
Living
Endangered
Answer:
Non Renewable would be correct option
Explanation:
Non Renewable resources are resources that cannot be replenished within a lifetime.
These resources cannot be replaced after once used.
Examples of Non Renewable resources are Coal , Petroleum & gas etc .