Answer:
Explanation:
Chapter 4: Energy from Combustion The primary means of generating energy for human
endeavors is the combustion of fuels.
Coal - burned in power plants
Gasoline - burned in automobiles
Natural gas - heating
Heating oil – heating
.Propane, charcoal, wood, candles, …
Combustion (burning in air) releases the chemical energy,stored in the chemical bonds of the fuels.
BRAINLY PLZ
A boy sets up a picnic on the beach next to a sand dune. how are sand dunes formed?
Answer:
Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. Once that first mound forms, sand piles up on the windward side more and more until the edge of the dune collapses under its own weight.
During vaporization, heat energy is:
Answers:
Added
Released
Stays the same
Answer:
During vaporization, heat energy is added.
6. An unknown compound is analyzed and found to consist of 49% carbon, 2.7
% hydrogen, and 48.2 % chlorine. If the molecular mass of the compound is 150,
what is the molecular formula of the compound?
Answer:
Molecular formula = C₆H₄Cl₂
Explanation:
Given data:
Percentage of hydrogen = 2.7%
Percentage of carbon = 49%
Percentage of chlorine = 48.2%
Molar mass of compound = 150 g/mol
Molecular formula = ?
Solution:
Number of gram atoms of H = 2.7 / 1.01 = 2.67
Number of gram atoms of Cl = 48.2 / 16 = 1.36
Number of gram atoms of C = 49 / 12 = 4.08
Atomic ratio:
C : H : Cl
4.08/ 1.36 : 2.67/1.36 : 1.36/1.36
3 : 2 : 1
C : H : Cl = 3 : 2 : 1
Empirical formula is C₃H₂Cl.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass = 12×3 + 1.01 ×2 + 35.5 = 73.52 g/mol
n = 150 / 73.52
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (C₃H₂Cl)
Molecular formula = C₆H₄Cl₂
what is the chemical name for K2Se
Answer:
Potassium selenide
Explanation:
Potassium selenide (K2Se)
Answer:
Potassium selenide
Explanation:
If you are cooking bread, and you weigh the dough before baking and weigh the bread after baking, but they weigh 2 different amounts, how is the law of conservation of mass still being followed?
Answer:
jayfeather friend me
Explanation:
In a toasty kitchen, your dough may proof in as little as an hour (or less!). When the temperatures dip, it can take much longer—upwards of two or even three hours.
✨✨What’s 2 similarities and 2 differences between the Earths layers and the atmospheric layers? ✨✨
‼️DONT COPY OFF LINE PLEASE ‼️
Answer:
Differences: Earth's atmosphere has 5 main layers where as atmospheric layers thins out in each higher layer.
Similarities: They both have multiple layers.
Explanation:
Sorry I only have 1 difference and similarity.
An apple, potato, and onion all taste the same if you eat them with your nose plugged
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✩✩✩
Hey, love!
You only get that little quote if your streak gets higher so, congrats on that!
Keep it up, stay lovely!
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how many atoms are in 2.85x10^3 g of gallium
Answer:
2850 grams I hope this help
protons are one of the heavier pieces of an atom. true or false?
Answer:
true
Explanation:
Which of the following best describes what would happenif mitosis did not take place?
A.Cells would get smaller and smaller over time.
B.Body tissues would not be able to repair themselves
c.The production of gametes (reproductive cells) wouldnot occur.
D.Organisms would all be multicellular.
Answer: B
Explanation:
What type of reaction is the following?
1 Mg(s) + 2 HCl(aq) → 1 MgCl2 (aq) + 1 H2 (9)
O Combustion
O Decomposition
O Double Replacement
O Neutralization
O Single Replacement
O Synthesis
Single Replacement
Further explanationGiven
Reaction
Mg(s) + 2 HCl(aq) → MgCl2 (aq) + H2 (g)
Required
Type of reaction
Solution
A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds
General formula :
A + BC ⇒ AC + B
Not all of these reactions can occur. We can use the activity series(the Volta series)
The more left the position of a metal in the series, the more reactive metal (easy to release electrons, the stronger the reductor)
What is the chemical name of the compound Cu(NO3)2? Use the list of polyatomic ions and the periodic table to help you answer.
A.
copper nitrate
B.
copper nitride
C.
copper(II) nitrate
D.
copper(IV) nitrate
E.
copper(IV) nitrite
Answer:
C. Copper (II) nitrate
Explanation:
It's an inorganic compound that forms a blue crystalline solid
Ions are the charged species of the atom that carries an extra or less electron. The chemical name of the compound Cu(NO₃)₂ based on polyatomic ions is copper (II) nitrate. Thus, option C is correct.
What is an ionic compound?An ionic compound is a type of chemical compound that is characterized by the presence of the ions or the charged species that results in electrostatic forces leading to the ionic bond formation.
The copper (II) nitrate compound is an example of an ionic compound as the Cu atom is metal and nitrogen and oxygen atoms are the non-metals. The metallic part of the compound carries a +2 charge while the non-metallic part consists of a negative charge.
Therefore, option C. Cu(NO₃)₂ can be named chemically as copper (II) nitrate.
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please help asap 10 & 11
Answer:
false
Explanation:
because if one of the p-protein of one is less then then the eyecolor will be different
10. When carrying out the
experiment with magnesium
and sulphuric acid, why do you
add magnesium until it stops
fizzing?
Answer:
To make sure all the sulphuric acid has been used up
What energy transformation occurs as the rabbit eats the grass?
A.
Chemical energy in the grass is transformed into thermal energy in the rabbit.
B.
Electrical energy in the grass is transformed into thermal energy in the rabbit.
C.
Mechanical energy in the rabbit is transformed into electrical energy in the grass.
D.
Thermal energy in the rabbit is transformed into mechanical energy in the grass.
Answer:
Chemical energy in the grass is transformed into thermal energy in the rabbit.
Explanation: Hope this helps
Explain why sometimes in a lab it seems like the conservation of mass isn’t accurate (but we know we haven't truly lost any mass)
Answer:
The law of conservation of mass states that in a closed system, the whole mass is conserved.
But the law of conservation of mass is not accurate sometimes in lab because in every chemical reaction, mass is converted into energy and not the whole mass can be conserved. Energy in chemical reaction can be created only by destroying the mass and not from any other means.
This is why, sometimes in a lab it seems like the conservation of mass isn’t accurate.
How many joules would it take to raise a 9.00 kg sample of cobalt 6°C?
6CO2 + 6H20 + Energy
Co H1206 + 602
D. heat of reaction
O C. thermal reaction
B. endothermic reaction
A. exothermic reaction
please help me I will give you 10 points
Answer:
red ig
Explanation:
Please help (: What are the sources and stages of a river ?
Water, ALSO if you cant figure out the answer looking up on g00gl3e
3 Stages of a River
YOUTHFUL STAGE (UPPER COURSE) – V- Shaped Valley > Erosion. ...
MATURE STAGE (MIDDLE COURSE) – Meanders > Erosion and Deposition.
OLD AGE STAGE (LOWER COURSE) – Floodplains > Deposition. ...
Advantages. Scenic Attraction. ...
Dangers. Flooding – Damage to property, land, animals and homes. ...
How do the formulas for molecular and ionic compounds differ? Explain the reason for
the difference.
Answer:
How do the formulas differ for molecular and ionic compounds? The formula for a molecular compound represents the atoms that make up one molecule of a compound. The formula for an ionic compound represents one formula unit of the compound. ... Put two electron between atoms to form a chemical bond.
Explanation:
I need help with number 5 pleaseee
Answer: the answer is d
Explanation:
Decane + Dioxygen = Carbon Dioxide + Water
Reaction Type
Combustion
Why are fungi classified together?
They get their food the same way
They have a similar behavior
They grow in the same areas
They look alike
Answer:
A, they get their food in the same way.
Explanation:
Some fungi can be toxic or poisonous.
Example: mushrooms. Mushrooms typically are found in forests and meadows/plains.
Some fungi are glowing, brown, and in many forms/shapes.
In conclusion, fungi all get nutrient from the dirt they grew in, forests can be moist which gives fungi excellent places to form, usually around trees, because they can absorb plenty of nutrients from the dirt.
What element has 7 valence electrons and 4 electron shells
Answer:
Mn
Explanation: 4th shell so 4th row and count 7 from the left most column
Prokaryotes store their DNA in a nucleus.
True
or false
Potassium nitrate is a component of black powder and a fertilizer. Its chemical formula is KNO3. Potassium nitrate is obtained by neutralizing which acid and alkali?
Answer:
Synthesis of Potassium Nitrate (KNO3)
When potassium hydroxide neutralizes nitric acid potassium nitrate is formed.
Answer:
Below.
Explanation:
Nitric acid and potassium hydroxide:
HNO3 + KOH ---> KNO3 + H2O.
How many moles are in 7.8g of CaO?
This compound is also known as Calcium Oxide. The SI base unit for amount of substance is the mole. 1 grams CaO is equal to 0.017832495800447 mole. Note that rounding errors may occur, so always check the results.
Hope I helped :)
Please help!!! How many moles are in 4.87x1024 atoms of Mg
Give an example of kinetic energy
Answer: A river flowing at a certain speed comprises kinetic energy as water has certain velocity and mass. The kinetic energy of an asteroid falling towards earth is very large. The kinetic energy of the aeroplane is more during the flight due to large mass and speedy velocity.
Explanation:
how many moles are in 4.38 of AgNO2
Answer: 0.02 moles
Explanation:
The number of moles in 4.38 g of AgNO₂ is equal to 0.028 mol.
What is a mole?A mole can be described as a standard unit that can be utilized to calculate a given number of particles. The constituents counted are usually individually distinct but identical entities.
A mole of the substance can be used to calculate quantities of atoms, molecules, ions, or other particular particles. The quantity of matter can be described as measured by elementary entities.
The number of constituents present in one mole is equal to 6.023× 10 ²³ which is known as Avogadro’s constant.
Given, the mass of AgNO₂ = 4.38 g
The mass of one mole of AgNO₂ = 153.87 g
The number of moles of in 4.38 g of AgNO₂ = 4.38/153.87 = 0.028 mol
Therefore, the number of moles of AgNO₂ is equal to 0.028 mol.
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