Answer:
There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.
Answer:
Internal sources of energy mean they are coming from within the earth
Explanation:
The following is what type of reaction: 2Al(s) + 3CuCl2(aq) ---> 2AlCl3(aq) + 3Cu(s)
Answer:
single replacment
Explanation:
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A stack of atoms on the periodic table is a column. Another name for this is a ________________.
Why does a feather fall slower than a rubber ball? How could you make them hit
the ground at the same time?
Answer:
Galileo discovered that objects that are more dense, or have more mass, fall at a faster rate than less dense objects, due to this air resistance. A feather and a rubber ball dropped together. Air resistance causes the feather to fall more slowly, while the ball falls more fast.
_____ energy has the total amount of
kinetic energy contained in all the
particles of a substance.
A: Thermal
B: Sound
C: Chemical
D: Electric
Answer: Thermal Energy
Explanation:
help plz 8th grade science
Answer:
B
Explanation:
Brainlest is apprciatedddddddddddd
What is the mass of a 5.00 cm^3 piece of copper having a density of 8.96 g/cm^3
Answer:
44.8 g
Explanation:
Density = mass / Volume
Mass = density x Volume = 8.96x 5 = 44.8 g
How many moles contain 5.34 x 10^26 atoms of iron?
Answer: 1.31 × 10^47 sorry if its not the answer
Explanation:
URGENTTTTT What is the correct formula when Al+3 combines with CrO4-2
A. Al2CrO43
B. Al2(CrO4)3
C. Al4(CrO)3
Which two are incorrect and why?
A new planet is discovered in a different solar system. The new planet is much like Earth. One difference is that the planet does not have seasons. What can you conclude is one feature of Earth that is
lacking from the new planet?
A.Earth has a tilted axis.
B.Earth has a moon.
C.Earth has a geosphere.
D.Earth has a longer rotational period.
Answer:
the answer is A
Explanation:The earth's spin axis is tilted with respect to its orbital plane. This is what causes the seasons.
What gives a pant cell a rigid shape?
A: Chloroplast
B: Vacuole
C: Cell wall
D: Cell membrane
Help me please
Extra points & brainlest
Answer:
Cell Wall
Explanation:
In plant cells, the cell wall is rigid the outer structure that protects the plant cell.
What is a food web?
A. A group of animals
B. A producer and consumer relationship
C. A food chain with two levels
D. How several food chains are related
Answer:
D. How several food chains are related
Explanation:
A blood droplet has a width of 42mm and length of 69mm. What is the angle of impact?
O 59
O 12
0 76
O 38
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How many moles of Fe2O3 can be made from 50 moles of Fe?
Answer: Synthesis
0.84 moles of oxygen
25 moles of [tex]Fe_2O_3[/tex]
Explanation:
The balanced chemical equation is:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
This is a synthesis reaction as one product is formed by combination of two reactants.
According to stoichiometry :
a. 2 moles of [tex]Fe_2O_3[/tex] require = 3 moles of [tex]O_2[/tex]
Thus 0.56 moles of [tex]Fe_2O_3[/tex] require=[tex]\frac{3}{2}\times 0.56=0.84moles[/tex] of [tex]O_2[/tex]
b. 4 moles of [tex]Fe[/tex] give = 2 moles of [tex]Fe_2O_3[/tex]
Thus 50 moles of [tex]Fe[/tex] give =[tex]\frac{2}{4}\times 50=25moles[/tex] of [tex]Fe_2O_3[/tex]
On a coordinate plane, which single transformation could map point A (3,-4) onto point A' (1.5,-2)? *
Answer: A dilation with rule: [tex](x,y)\to(\dfrac12x,\dfrac12y)[/tex]
Explanation:
A dilation is a non-rigid transformation that creates an image that is the same shape as the original but has a different size.
It uses a scale factor k such that
[tex](x,y)\to(kx,ky)[/tex]
(x,y)= coordinates of original figure
(kx,ky) = corresponding coordinate in the image.
To transform: A (3,-4) onto point A' (1.5,-2).
Using scale factor k= [tex]\dfrac12[/tex], we have
[tex]A(3,-4)\to A'(\dfrac12\times3, \dfrac12\times-4)=A'(1.5,-2)[/tex]
Required rule: [tex](x,y)\to(\dfrac12x,\dfrac12y)[/tex]
Determine the number of grams in 0.5 moles of H2 S04
Will mark brainly
ASAP
Answer:
A. Shivering
Explanation:
This is the job of the excretory system. You remove waste as a gas (carbon dioxide), as a liquid (urine and sweat), and as a solid. Excretion is the process of removing wastes and excess water from the body. Recall that carbon dioxide travels through the blood and is transferred to the lungs where it is exhaled.
What is the function of the right side of the heart?
takes in oxygen rich blood from the lungs
carries oxygen and nutrients from the arteries to the tissues
releases oxygen rich blood to the veins
takes in blood from the body that has no oxygen
Given the balanced equation representing a reaction:
2NO + 0, → 2NO, + energy
The mole ratio of NO to NO2 is
A)
1 to 1
B)
2 to 1
C)
3 to 2
D)
5 to 2
What is the molality of a solution of 0.25 moles of sucrose in dissolved in enough water to make 4.00 liters of water?
Which best describes the relationship between the circulatory system and the respiratory system?
The circulatory system is the transport system for the respiratory system.
The respiratory system is the transport system for the circulatory system.
The circulatory system diffuses red blood cells into the respiratory system to pick up oxygen.
The respiratory system transfers hemoglobin to the red blood cells of the circulatory system.
Answer:
its a
Explanation:
yw
The respiratory and circulatory systems work together to maintain the homeostasis of the human body. The circulatory system is the transport system for the respiratory system. The correct option is A.
What is respiratory system?The network of organs and tissues which help us to breathe is defined as the human respiratory system. The main function of this system is to introduce oxygen into the body and to expel carbon dioxide from the body.
The human circulatory system consisting of arteries, veins and capillaries provide all the essential nutrients, minerals and hormones to the various parts of the body.
The respiratory system does not work alone in transporting oxygen through the body. The oxygen taken in from the respiratory system moves into blood vessels that then circulate oxygen rich blood to tissues and cells.
Thus the correct option is A.
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According to Reference Table G, how does a
decrease in temperature from 40°C to 20°C affect
the solubility of NH3 and KCl?
A) The solubility of NH3 increases, and the
solubility of KCl increases.
B) The solubility of NH3 increases, and the
solubility of KCl decreases.
C) The solubility of NH3 decreases, and the
solubility of KCl increases.
D) The solubility of NH3 decreases, and the
solubility of KCl decreases.
Answer:
A) The solubility of NH3 increases, and the
solubility of KCl increases.
Explanation:
The solubility of ammonia and potassium chloride increases with decrease in temperature from 40°C to 20°C.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Please help me due tomorrow
Explanation:
this are answers
Ce presiune au 40L gaz la temperatura de 100⁰C, dacă la presiunea de 6 atm și temperatura de 50⁰C volumul ocupat este de 20L.
Answer:
3,46 atm
Explanation:
Tenemos;
P1 =?
T1 = 100 + 273 = 373 K
V1 = 40 litros
P2 = 6 atmósferas
T2 = 50 + 273 = 323 K
V2 = 20 litros
Desde;
P1V1 / T1 = P2V2 / T2
P1V1T2 = P2V2T1
P1 = P2V2T1 / V1T2
P1 = 6 * 20 * 373/40 * 323
P1 = 44760/12920
P1 = 3,46 atm
How many moles are in 1.22 * 10^20 atoms of Si
Answer:
2.03 × 10⁻⁴ moles
Explanation:
To convert atoms to moles, use Avogadro's number (6.022 × 10²³).
(1.22 × 10²⁰ atoms)/(6.022 × 10²³ atoms/mol) = 2.03 × 10⁻⁴ mol
Answer:
7.35×1023 atoms
Explanation:
What is the molar mass of Zn(NO3)2 ?
Answer:
molar mass of zn( no3) 2
is 189.36 g/ mol
A closed flask contains gas at STP. If the temperature is raised to 400 K what will the pressure be in atm?
Answer:
The answer is 1.5 atm
Explanation:
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Name 5 different foods with carbohydrates.
A sample of helium gas has a volume of 620. Ml at a temp of 500 K. If we decrease the temperature to 100K while keeping the pressure constant what will the new volume be?
Answer:
A sample of helium gas has a volume of 620mL at a temperature of 500 K. If we ... to 100 K while keeping the pressure constant, what will the new volume be?
Explanation:
A sample of helium gas has a volume of 620. Ml at a temp of 500 K. If we decrease the temperature to 100K while keeping the pressure constant 124 ml will the new volume be.
What is volume ?Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.
The capacity of an object is measured by its volume. For instance, a cup's capacity is stated to be 100 ml if it can hold 100 ml of water in its brim. The quantity of space occupied by a three-dimensional object can also be used to describe volume.
According to Charles' Law, at constant pressure,
V1 / T1 = V2 / T2
V1 = 620 ml and T1 = 500K, V2 = ? , T2 = 100K
620 ml / 500K = V2 / 100K
V2 = ( 620 ml ) ( 100K ) / 500K
Volume = 124 ml
Thus, If we decrease the temperature to 100K while keeping the pressure constant 124 ml will the new volume be.
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The following equation is balanced: 4 H3PO4 --> P4O10 + 6 H2O
Group of answer choices
True
False
Answer:
True
Explanation:
The given chemical equation is balanced as it has equal number of atoms of each element on both sides.Hence it is true.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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In this lab, you will use a precise scale and heat to identify the mole ratio of an unidentified hydrate. Write an investigative question that you can answer by doing this experiment.
Answer:
How can drying a hydrate help you determine its mole ratio of water to salt?
Explanation:
When we are investigating the mole ratio of a hydrate by heating we can have some scientific questions to solve here, like how much heat energy is needed to dry the hydrate of specified quantity, similarly how the evaporation helps to determine the mole ratio?
What are hydrates?Some compounds easily absorbs water molecules into them and forms hydrates that are compounds associated with water molecules. The property getting moisture easily is called deliquescence.
There are many compounds which able to form hexahydrates, penta hydrates, dihydrates etc. The mole ratio with water depends on the nature of the compound and mostly to the bond type.
By heating the hydrates can be dried by evaporation of water. But the temperature used to evaporate varies with the water content. Thus, question we can have here, is how heating helps to find mole ratio and how heat energy is used to make it dry.
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