What do concentric contour lines on a topographic map represent?
Answer:
Concentric circles of contour lines indicate a hilltop; concentric circles with hachure marks indicate a close depression.
Explanation:
Hope this helped Mark BRAINLIEST!!!
why is space cold ???
Because the space is ultimate thermos.
2. What human-related environmental
factors might also be affecting the
growth of the toxic algae?
Answer:
Polution
Explanation:
For the chemical reaction 2KI+Pb(NO3)2⟶PbI2+2KNO3 how many moles of lead(II) iodide (PbI2) are produced from 8.0 mol of potassium iodide (KI)? number of moles: mol
Answer:
the number of moles is 6
Explanation:
The computation of the number of moles is given below:
According to the question
Since 2 mol of KI produces 1 mol of PbI2
based on the above information
The number of moles would be
8 mol will produce 6 mol of PbI2
Therefore the number of moles is 6
Hence, the same is considered and relevant too
The other things would be ingored
Silicon is a key component of electronic devices. This element is a(n)__, a type of element also called a(n)__.
Answer:
Metalloid ; semiconductor
Explanation:
Calculate the moles of Iron (III) Sulfide (Fe253) in 218.8 grams. The molar mass of Iron (III) Sulfide is 207.90 g/mol. Do not include units in your response.
Answer:
1.052
Explanation:
In order to convert from grams of a substance to moles, we need to divide the given mass by the molar mass of the substance:
Moles = Mass / Molar MassAll the required data is given by the problem:
Moles = 218.8 g / 207.90 g/mol = 1.052 molesThere are 1.052 moles in 218.8 grams of iron (III) sulfide.
what role does the grass play in the food web?
A. Producer B. Primary Consumer C. secondary Consumer D. Decomposer
Answer:
Producer
Explanation:
I took the test :)
what are the reasons that you cannot see many stars in the city nights?
Answer:
Because of the artificial lights influencing the dark night, turning it into a grey.
Calculate the amount of copper in moles in a 27.5g pure copper sheet
The amount of copper in moles in the 27.5 g pure copper sheet is approximately 0.433 moles.
To calculate the amount of copper in moles in a pure copper sheet, we need to use the molar mass of copper and the given mass of the sheet.
The molar mass of copper (Cu) is approximately 63.55 g/mol. This value represents the mass of one mole of copper atoms.
Given that the mass of the pure copper sheet is 27.5 g, we can calculate the number of moles using the following formula:
moles = mass / molar mass
Substituting the values:
moles = 27.5 g / 63.55 g/mol
moles ≈ 0.433 mol
Therefore, the amount of copper in moles in the 27.5 g pure copper sheet is approximately 0.433 moles.
To arrive at this result, we divided the given mass of the sheet (27.5 g) by the molar mass of copper (63.55 g/mol). This calculation allows us to convert the mass of the sheet into the corresponding number of moles of copper.
The result tells us that the 27.5 g pure copper sheet contains approximately 0.433 moles of copper atoms. This conversion to moles is useful in various chemical calculations and allows for easier comparison and analysis of quantities on a molecular scale.
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what blood vessels and chambers of the heart does a molecule of glucose absorbed through the gut passes on its way to an active muscle in the leg
Answer:
Blood capillaries
Explanation:
The walls of capillaries are just one cell thick. Capillaries therefore allow the exchange of molecules between the blood and the body's cells - molecules can diffuse across their walls. This exchange of molecules is not possible across the walls of other types of blood vessel.
What's the bond between two atoms of hydrogen?
Answer:There is a iin dipole attraction between two hydrogen atom
Explanation:
The same atoms have the ion dipole attraction between them the same atoms repel each other
What is the chemical formula for an acid?
HELPPPP ASAP!!! Plzzz
Answer:
420 miles
Explanation:
From the question given above, the following data were obtained:
Time = 3.5 hours
Speed = 120 mi/h
Distance =?
Speed is defined as the distance travelled per unit time. Mathematically, it is expressed as:
Speed = distance / time
With the above formula, we can obtain the distance travelled by the plane as follow:
Time = 3.5 hours
Speed = 120 mi/h
Distance =?
Speed = distance / time
120 = distance / 3.5
Cross multiply
Distance = 120 × 3.5
Distance = 420 miles
Thus, the distance travelled by the plane is 420 miles
How many grams of C5Hg would you need to measure out to have 0.172 mol?
We would need to measure out approximately 44.84 grams of C5Hg to have 0.172 mol.
To determine the grams of C5Hg needed to have 0.172 mol, we need to use the molar mass of C5Hg and the given amount in moles. The molar mass of a compound represents the mass of one mole of that compound.
The molar mass of C5Hg can be calculated by summing the atomic masses of all the atoms in the compound:
C5Hg: (5 * atomic mass of C) + (1 * atomic mass of Hg)
Using the atomic masses from the periodic table:
Atomic mass of C = 12.01 g/mol
Atomic mass of Hg = 200.59 g/mol
Molar mass of C5Hg = (5 * 12.01 g/mol) + (1 * 200.59 g/mol) = 60.05 g/mol + 200.59 g/mol = 260.64 g/mol
Now, we can calculate the grams of C5Hg needed for 0.172 mol using the mole-to-mass conversion:
Grams of C5Hg = Moles of C5Hg * Molar mass of C5Hg
Grams of C5Hg = 0.172 mol * 260.64 g/mol = 44.84 grams (rounded to two decimal places)
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True or False?
Weak bases dissociate
completely into (OH)- and
metal cations.
Answer:
False
Explanation:
When weak bases dissociate, an equilibrium is established rather than dissociating 100%. So OH- and metal ions are partially ionized.
What is the volume of .80 g of O2 gas at STP?
Answer:0.56L
Explanation:Molar mass of O2=32
N=0.8/32
N=0.025
V=0.025 x 22.4=0.56L
Pleaseee helpppp!!!!!!!!
Answer:
a covalent would be the two that are nonmetals
8. If 134 L of Nitrogen gas at STP is combined with 99 L of Chlorine gas at STP,
Which is the limiting reactant?
N2 + Cl2 → NCI3
.
Answer:
Cl₂ is the limiting reactant.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
N₂ + 3Cl₂ —> 2NCl₃
From the balanced equation above,
1 L of N₂ reacted with 3 L of Cl₂.
Finally, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above,
1 L of N₂ reacted with 3 L of Cl₂.
Therefore, 134 L of N₂ will react with = 134 × 3 = 402 L of Cl₂.
From the calculation made above, we can see that a higher volume (i.e 402 L) of Cl₂ than what was given (i.e 99 L) is needed to react completely with 134 L of N₂.
Therefore, Cl₂ is the limiting reactant and N₂ is the excess reactant.
2H2O → 2H2 + O2
OSynthesis
O Decomposition
O Combustion
O Single Replacement
O Double Replacement
An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and
Che moment it hits the target?
O The potential energy and kinetic energy remain the same.
O The potential energy decreases as kinetic energy increases.
O The kinetic energy decreases as potential energy increases.
O The kinetic energy remains at zero, but potential energy increases.
Answer:
C brainliest
Explanation:
An arrow is fired at a target on a high wall. The kinetic energy will decrease as potential energy increase.
Kinetic energy is one of the energies that is related to the motion of the particle and potential energy is one of the energies that is related to the position and height of the particle.
As the arrow in the question will go high to the wall, speed of arrow will keep on decreasing and kinetic energy keeps on decreasing and as height increases potential energy also increases.
We know that As per law of conservation of energy, as kinetic energy decreases potential energy will increase in the same amount.
Therefore, An arrow is fired at a target on a high wall. The kinetic energy will decrease as potential energy increase.
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In the second step, acetylene, carbon dioxide and water react to form acrylic acid: (g)(g)(g)(g) Write the net chemical equation for the production of acrylic acid from calcium carbide, water and carbon dioxide. Be sure your equation is balanced.
Answer:
6C2H2(g) + 16H2O(g) + 3CO2(g) ------> 6Ca(OH)2(s) + 5CH2CHCO2H(g)
Explanation:
The reaction has the first step as the reaction of calcium carbide with water to yield acetylene and calcium hydroxide as follows;
6CaC2(s) + 12H2O(g) -----> 6C2H2(g) + 6Ca(OH)2(s)
In the second step, acetylene, carbon dioxide and water react to form acrylic acid as follows;
6C2H2(g) + 4H2O(g) + 3CO2(g) ------> 5CH2CHCO2H(g)
The overall reaction equation is as follows;
6C2H2(g) + 16H2O(g) + 3CO2(g) ------> 6Ca(OH)2(s) + 5CH2CHCO2H(g)
Convert 5.28 x 1019 molecules of C6H1206 to grams.
Answer:
[tex]m=0.0158g[/tex]
Explanation:
Hello there!
In this case, it is possible to comprehend these mass-particles problems by means of the concept of mole, molar mass and the Avogadro's number because one mole of any substance has 6.022x10²³ particles and have a mass equal to the molar mass.
In such a way, for C₆H₁₂O₆, whose molar mass is about 180.16 g/mol, the referred mass would be:
[tex]m=5.28x10^{19}molecules*\frac{1mol}{6.022x10^{23}molecules}*\frac{180.16g}{1mol}\\\\m=0.0158g[/tex]
Best regards!
2 Nal + Pb(NO3)2
2 NaNO3 + Pb12
How many oxygen atoms are on the left side of the equation?
there are 6 O atoms suvdjwndje
A 1.om sample of dry air at
at 25°c at 786mmHg contains 0.925g Nitrogen Plus other gases including oxygen, argon and carbon dioxide. what is the partial pressure of Na with the air sample.
Answer:
Is the question not supposed to be what is the partial pressure of Nitrogen not Sodium
K(+1)Cl(+5)O3(-2) → K(+1)Cl(-1) + O2(0)
Answer:
Looooolllllllllllll
Explanation:
What is the question bro
The trait that shows up in the first generation.
Recessive
Dominant
Ok
Answer:
Dominant
Explanation:
hope this help
A double-replacement reaction takes place when aqueous Na,co, reacts with aqueous Sn(NO3), according to the following equation. Na,co, + Sn(NO,)
You would expect one of the products of this reaction to be
20
Sn2(CO3)2
NaNO,
O Nas
OCNO,
Answer:
[tex]Sn(CO_3)_2[/tex] and [tex]NaNO_3[/tex].
Explanation:
Hello there!
In this case, according to the described chemical reaction between sodium carbonate and tin nitrate, we can write the undergoing chemical reaction:
[tex]2Na_2CO_3+Sn(NO_3)_4\rightarrow Sn(CO_3)_2+4NaNO_3[/tex]
Thus, we notice that the products are strontium carbonate and sodium nitrate, whose formulas are [tex]Sn(CO_3)_2[/tex] and [tex]NaNO_3[/tex] respectively.
Best regards!
In fall, leaves may change from green to yellow or red. Explain in your own words what is happening inside the leaf with regard to plant pigments.
Answer:
The pigment that causes leaves to be green is chlorophyll. ... As chlorophyll goes away, other pigments start to show their colors. This is why leaves turn yellow or red in fall. In fall, plants break down and reabsorb chlorophyll, letting the colors of other pigments show through.
name 3 metallic elements
Answer:
lithium
sodium
magnesium
What material would make the most efficient hot pack?
●Lithium Chloride
●Sodium Chloride
●Sodium Hydroxide
●Potassium Chloride
Answer:
Lithium Chloride would be the best one
Sodium Hydroxide would be the second best
Explanation: