how many layer does the earth have?
Answer:
The earth is split into four major layers: the crust, the mantle, the outer core and the inner core
Explanation:
Write the formulas for the following compounds :
Sodium phosphate
Phosphorus triiodide
Explanation:
1.Na3PO4
2.PI3
therefore this is the formula for sodium phosphate and phosphrous triiodide
How is entropy related to the spontaneity of a reaction? AP3X
Answer:
S>0 contributes to spontaneity.
Explanation:
i just took the test on a pex :)
According to the law of thermodynamics, the relationship between entropy and the spontaneity of a reaction is S > 0.
What is entropy?Entropy is the total amount of energy in a closed system that is present there, but there are no uses for that energy. It is the unused energy for any work.
By the second law of thermodynamics, any spontaneous process results in an increase in the universe's overall entropy. The total of the entropy produced by the spontaneous process and the change in energy brought on by the heat flow is known as the net change in entropy of the system or S.
The reaction will be spontaneous if the delta G is negative. Delta G is the Gibbs free energy. So the entropy S will be greater that the reaction.
The Gibbs free energy equation is:
△G = △H − T△S
Thus, the relation is S > 0.
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ILL MARK BRAINLIEST :)
Describe the law of conservation of mass in your own words *DO IT IN YOUR OWN WORDS PLEASE*
Explanation:
According to the law of conservation of mass, mass can neither be created nor destroyed but it can simply be transformed from one form to another.
For example, [tex]Na^{+} + Cl^{-} \rightarrow NaCl[/tex]
Mass of Na = 23 g/mol
Mass of Cl = 35.5 g/mol
Sum of mass of reactants = mass of Na + mass of Cl
= 23 + 35.5 g/mol
= 58.5 g/mol
Mass of product formed is as follows.
Mass of NaCl = mass of Na + mass of Cl
= (23 g/mol + 35.5) g/mol
= 58.5 g/mol
As mass reacted is equal to the amount of mass formed. This shows that mass is conserved.
As a result, law of conservation of mass is obeyed.
How many grams of copper (II) oxide will react with 10 liters of hydrogen gas?
Answer:
maybe 200g
I don't know thats just a guess
HOPE ITS TURE
When 0.875 g. of magnesium was heated in air, 1.25 g. of magnesium oxide
(MgO) was produced. How much oxygen must be added?
Answer:
1. What is the coefficient for calcium in the balanced equation?
2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2
2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must
write the equation, balance it and solve the mass-mass problem.
a. Balanced equation:
2 C2H2 + 5 O2 4 CO2 + 2 H2O
Explanation:
Is this correct??Pls help!!!
Answer:
C
Explanation:
Answer:
Yes, your answer is correct. B is correct :3
When you mix water and salt you get a.
What is the definition of bond (in chemistry) ?
Answer:
Bond is a force that binds two atoms together.
what does climate change have to do with glacial change
Answer:
Because glaciers are so sensitive to temperature fluctuations accompanying climate change. so if it gets hotter then the ice glaciers will melt.
Explanation:
Water and oil are "immiscible", meaning they do not mix but stay
separated when combined in a glass. What is the best explanation for this?
1.both are polar molecules
2.both are nonpolar molecules
3.water is a polar molecule and oil is a nonpolar molecule
4.water and oil are both compounds
Answer:
Good luck man
Explanation:
Good luck man
What is the pressure of the gas if we have 3.50 moles of helium at -50.0°C
in a rigid container whose volume is 25.0 liters?
003 kPa
-58.2 kPa
259.6 kPa
0.0 kPa
Answer:
259.6kPa
Explanation:
because it is big
Which heat source is most directly connected to the seasons?
Answer:
the solar heat source from the sun is what gives us most of the heat
Explanation:
How do textbooks usually describe Le Châtelier's famous principle
Answer:is an observation about chemical equilibria of reactions. It states that changes in the temperature, pressure, volume, or concentration of a system will result in predictable and opposing changes in the system
Explanation:
Help please At which boundary type would mountains, such as the Himalayans, most likely form?
Question 6 options:
Divergent
Convergent
Transform
Slip Fault
Answer:
convergent is the answer
Which statement describes the Richter scale?
It cannot account for fault movement during an earthquake.
It measures large earthquakes far from the seismograph.
It estimates the total energy released from an earthquake.
It increases in magnitude as amount of damage increases.
Answer:
It measures large earthquakes far from the seismograph.
Explanation:
It uses a seismograph to measure earthquakes far from the seismograph where seismic waves are used to determine the magnitude of an earthquake.
Answer: d. It increases in magnitude with an increase in size of seismic waves.
Explanation:
20. Which of the following is the correct name for N205?
O nitrate oxide
O dinitrogen pentoxide
O nitrous oxide
O nitrogen dioxide
Answer:
B!
Explanation:
Di stnds for 2 (N2)
pent = 5 (05)
Which of the following statements is true?
A- Chemical digestion includes the physical breakdown of chunks of food.
B- Mechanical digestion begins in the mouth, and includes the tearing and grinding of food with teeth.
C- Mechanical digestion uses teeth to grind food and saliva to moisten the food
making it easier to chew.
D- Chemical digestion includes the chemical breakdown of food and mixing of the food particles with the help of the tongue
B- Mechanical digestion begins in the mouth, and includes the tearing and grinding of food with teeth.
C- Mechanical digestion uses teeth to grind food and saliva to moisten the food
making it easier to chew.
These points are true.
How many electrons does GeH4 have
If 2.28 g C8H18 reacts with 7.00 g of Oz, predict the mass of CO, that can be produced and
identify the limiting reactant. Explain how you got your answers.
Unbalanced equation: C8H180 + 026) • CO26) + H₂O
Answer:
O₂ is limiting reactant and 6.17g CO₂ can be produced
Explanation:
Based on the balanced reaction:
C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O
1 mole of C₈H₁₈ reacts with 25/2 moles O₂.
To solve this question we must convert the mass of each reactant to moles and, using the balanced reaction, we can find limiting reactant. With moles of limiting reactant we can find the moles of CO₂ and its mass as follows:
Moles C₈H₁₈ -Molar mass: 114.23g/mol-
2.28g * (1mol / 114.23g) = 0.0200 moles C₈H₁₈
Moles O₂ -Molar mass: 32g/mol-
7.00g * (1mol / 32g) = 0.219 moles O₂
For a complete reaction of 0.0200 moles C₈H₁₈ are needed:
0.0200 moles C₈H₁₈ * (25/2moles O₂ / 1mole C₈H₁₈) = 0.250 moles of O₂ are needed.
As there are just 0.219 moles, O₂ is limiting reactant.
Moles of CO₂ that can be produced:
0.219 moles O₂ * (8moles CO₂ / 25/2moles O₂) = 0.140 moles CO₂
The mass is -Molar mass CO₂: 44.01g/mol-:
0.140 moles CO₂ * (44.01g / mol) =
6.17g CO₂ can be producedWhich of the following is an acid-base neutralization reaction?
A
Mg + 2 HCl → MgCl2 + H2
B
SiCl4 → Si + 2 Cl2
C
AgNO3 + KCl → AgCl + KNO3
D
HCl + KOH → KCl + H2O
Answer:
D
Explanation:
The reaction in which an acid reacts with a base to form salt and water is called acid base reaction.
here, HCL ( strong acid) reacts with KOH (strong base) and KCL (salt) and H2O (water) is formed.
The reaction between HCl and KOH is an example of acid-base neutralization reaction. Thus, the correct option is D.
An acid-base neutralization reaction refers to the reaction between an acid and a base that react to form a corresponding salt and water.
The anion from the acid and the cation from the base combine to form the salt. In this case, chloride ions (Cl⁻) and potassium ions (K⁺) combine to form the salt potassium chloride (KCl).
Salt formation leads to neutralization of the charge in the molecule, and also, the pH of the solution gets neutralized whose extent depends upon the strength of the acid and base used.
The hydrogen ions (H⁺) from the acid and hydroxyl ions (OH⁻) from the base combine to form water.
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If the half-life of a radioactive substance is 500 million years and you have 48 atoms of it, how many half-lives will have passed by the time that 6 atoms of the substance remain?
O A. 3
O B. 2
O C. 4
O D. 5
Answer: 3
Explanation:
how many carbon atoms are in 26-hydrogen alkyne
Can someone help me with these answers please I’ll give Brainly !!!!
1.What's the first thought that comes to mind when you hear "nuclear"? nuclear, that's the word. well the first thing that comes into everyone's mind in nuclear and they have to think it then think of words that associate with it.
2.the most important point of something.
3.test site
4.
What do plants do with sugar? *
Release it through their stoma
Eat it for energy
Convert it into oxigen
Convert it into water
Answer:
its B .Eat it for energy.
How many moles are in 2.8x10^24 atoms of silicon?
Answer:
4.6 mol Si
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
[Given] 2.8 × 10²⁴ atoms Si
[Solve] moles Si
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 2.8 \cdot 10^{24} \ atoms \ Si(\frac{1 \ mol \ Si}{6.022 \cdot 10^{23} \ atoms \ Si})[/tex][DA] Divide [Cancel like units]: [tex]\displaystyle 4.64962 \ mol \ Si[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
4.64962 mol Si ≈ 4.6 mol Si
If a book has a weight of 23.2 N on Earth, what is its mass?
Answer: Mass is 2,37 kg
Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.
m = W/g = 23.2 N / 9.81 m/s²
True or False?
When it is summer in the Northern Hemisphere, it is summer all around the word
Deforestation is the act of destroying forests so the land can be used for other purposes. Do you think deforestation increases, decreases, or has no effect on the biodiversity of the forest ecosystem? Explain your answer.
Answer:
deforestation decreases biodiversity of the forest ecosystem
Explanation:
Deforestation has to do with the process of felling trees. This process destroys forest ecosystems. Deforestation is normally carried out for the purpose of development.
An ecosystem is a self supporting unit in which living and non living things interact. The different species of plants and animals found in an ecosystem is called biodiversity.
Since organisms in an ecosystem interact among each other and with their non-living environment, destruction of the trees in the forest ecosystem leads to the loss of certain species present in the ecosystem.
For instance, climbers and animals found on tree tops are normal components of a forest ecosystem. When trees are felled and the forest ecosystem is destroyed across the world, these organisms are threatened. This leads to loss of species or loss of biodiversity.
Answer:
Here’s one possible answer:
Deforestation will likely decrease the biodiversity of the forest ecosystem. It reduces the living space and food sources for some of the organisms. Scarcity of space and food may be a threat to the population of those organisms. Over time, some species may die off, leaving fewer species in the forest.
Explanation:
A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy. The efficiency of the engine is
A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy, then efficiency of the engine is 25%.
How do we calculate efficiency?We can calculate the efficiency by using the below equation as:
Efficiency = (Actual production / Theoretical production) × 100%
Given that,
Actual production = 604 kJ
Theoretical production = 2,416 kJ
On putting values in given equation, we get
Efficiency = (604/2,416) × 100% = 25%
Hence efficiency of the engine is 25%.
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