Answer:
The plateaus or horizontal lines on the graph represent the transition between states of the sample. The first plateau represents the melting (or transition from solid to liquid) and the second plateau represents boiling (or transition from liquid to gas).
Explanation:
Mechanical energy is the sum of two types of energy—kinetic energy and potential energy. Which of the following is an example of an object that has kinetic energy?
Answer:
There is no picture but the one that is in motion in the picture has kinetic energy.
Explanation:
Kinetic energy is the energy of motion.
hope this helped!
What is happening right now to the Arctic ice cap?
I give Brainliest!
Answer:
I'm pretty sure a lot of them are melting because of global warming
A substance conducts electricity because of free moving, charged particles.
what are the free moving charged particles in a :
carbon electrode(made of graphite)
molten mixture of aluminum oxide and cryolite
metal wire?
Answer:
carbon electrode: delocalised electrons
molten mixture....: aluminium oxide ions
metal wire: Metal atoms
The free moving charged particles in the following substances are as follows;
carbon electrode(made of graphite); Delocalized electrons.molten mixture of aluminum oxide and cryolite;. Aluminium ions in Aluminium oxide.Metal wire; Metal ionsGraphite, an allotrope of carbon has Delocalized (free-moving) electrons and these electrons serve to enable conductivity.
Although, cryolite is a bad conductor of electricity, when Molten Aluminium oxide and cryolite is used, the free moving Aluminium ions enable conductivity.
In metal wires, conductivity is solely the responsibility of metal ions.
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what compound is YCI3
Answer:
Yttrium, Carbon, Iodine
Explanation:
Y stands for Yttrium
C stands for Carbon
I stands for Iodine
and 3 stands for 3 Iodine atoms
Determine the pH of a 2.8 ×10−4 M solution
of Ca(OH)2.
Answer:
pH = 10.75
Explanation:
To solve this problem, we must find the molarity of [OH⁻]. With the molarity we can find the pOH = -log[OH⁻]
Using the equation:
pH = 14 - pOH
We can find the pH of the solution.
The molarity of Ca(OH)₂ is 2.8x10⁻⁴M, as there are 2 moles of OH⁻ in 1 mole of Ca(OH)₂, the molarity of [OH⁻] is 2*2.8x10⁻⁴M = 5.6x10⁻⁴M
pOH is
pOH = -log 5.6x10⁻⁴M
pOH = 3.25
pH = 14-pOH
pH = 10.75Question 1 0 Which of the following numerical expressions gives the number of moles in 5.0 g of CaO?
A) 5.0 g X 56 g/mol
B) 5.0 g / 56 g/mol
C) 56 g/mol / 5.0 g
D) 1/5.0 g X 1/56 g/mol
Answer: A
Explanation:
5.0 g / 56 g/mol is the numerical expression that gives the number of moles in 5.0 g of CaO.
HOW TO FIND NUMBER OF MOLES:
The number of moles in a substance can be calculated by dividing the mass of that substance in grams by its molar mass in grams/moles. Number of moles = mass ÷ molar massIn this question, 5.0g of calcium oxide (CaO) was given. The molar mass of CaO is as follows:CaO = 40g/mol + 16g/mol = 56g/mol
Number of moles = 5.0g ÷ 56g/mol
Therefore, 5.0 g / 56 g/mol is the numerical expression that gives the number of moles in 5.0 g of CaO.
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Describe some of the solutions that engineers might propose for maximizing the percent yield of hydrogen from discarded wood.
A possible solution for maximizing the percentage of hydrogen in discarded wood is to design a machine that can collect more effectively all the gases and separate hydrogen from other gases.
How do people produce hydrogen using discarded wood?Discarded wood and other products can still produce important elements nitrogen, methane, and hydrogen. This is possible through combustion that releases these elements in a gas.
What is the limitation of this method?This is a new method and it is still not completely developed. Due to this, the equipment is not as efficient as one would like, for example, all gases are initially collected together but this is a problem if only one gas is needed.
Based on this, a potential solution would be to create a machine that is more efficient in collecting and separating the gases.
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Can any one plz solve and send this question who ever solve this right I will make you brainliest this is physic
Answer: Energy = 10000J - 2000J = 8000J
Therefore, the energy is dissipated the skier moves down to the slope is 8000J
Explanation:
What is the function of the pistil and stamen of a plant?
To allow the plant to reproduce.
They provide support for the plant.
They protect the plant from the weather.
The protect the plant from predators.
Answer:
the answer is A
Explanation:
Hopefully u get the answer right
Answer:
A
Explanation:
give me thanks not stars
compare and contrast between combustion and rusting
Answer:
combustion is fast and destructive it also involves a lot of movement of the atoms where erosion is a slow process that does not involve a lot of energy
Ethyl alcohol has a density of 0.80 g/mL. What is the volume of 44g of ethyl alcohol
ANSWER CHOICES
55 mL
35 mL
42 mL
0.80 mL
Answer:
55mL
Explanation:
44g / 0.8g/mL = 55mL
what is the compound name for (NH4)2SO4
Answer:
Diazanium sulfate is the correct answer.
Explanation:
Hope this helped Mark BRAINLIEST!!
What is the molar solubility of lead phosphate in water in moles?
Please help?!
Answer:
Now, the molar solubility of lead(II) phosphate in water is said to be equal to 6.2⋅10−12mol L−1 . This means that in one liter of water, presumably at room temperature, you can only hope to dissolve 6.2⋅10−12 moles of lead(II) phosphate.
Explanation:
Hope this helps!!
Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? Explain
a.Nitrogen
b.Oxygen
c.Argon
Answer: argon
Explanation:
The vat is made of metal. Why would it matter that the material from which the vat is made is metal ?
Answer:
Due its storing and holding ability.
Explanation:
It matter that the material from which the vat is made is metal because this vat is used for storing and holding liquids. Vat is a large container or tank that is used for storing or holding liquids in industrial sector. This vat is made of metal which increases its strength and durability. If the vat is made of wood or plastic so it can't hold huge amount of liquid or chemical due to its weak material so that's why it matters that the substance from which the vat is made is metal or not.
Consider the following reaction: Solid zinc was added to 1.0 M HC1.
After 20.0 s, the temperature of the container increased by 0.5°C and 25.00 mL of
H2 was produced. The rate of this reaction was
Answer:
1.25 mL/s
Explanation:
Your are told that 25.0 mL of H2 was produced 20 seconds. This is equal to rate 25/20 = 1.25 mL/s
When a reaction progresses, the reactant concentration gradually decreases and the product concentration gradually increases. Here the rate of the reaction is 1.25 mL/s.
What is rate of reaction?The rate of a chemical reaction is defined as the rate of decrease of concentration of a reactant or the rate of increase of concentration of a product. The rate of the reaction is usually expressed in units mol L⁻¹s⁻¹. The rate of the reaction are affected by several factors like concentration of the reactants, temperature, etc.
An equation which expresses the experimentally observed rate of a reaction in terms of the molar concentration of the reactants which determine the rate of the reaction is called rate equation.
Here it is seen that 25.0 mL of H2 was produced 20 seconds. So the rate is given as:
Rate = 25/20 = 1.25 mL/s
Thus the rate of the reaction is 1.25 mL/s.
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How many grams are in 1.7 moles of CO2?
Answer:
748.1615 grams
Explanation:
Is this molecule a polar or non polar?
Answer:
This is polar
Explanation:
If the arrows are of different lengths, and if they do not balance each other, the molecule is polar.
If the arrangement is asymmetrical, the molecule is polar.
Hope this helped!!!
How many moles of O2 are needed to produce 8.33 moles of H2SO4?
When water reacts with potassium metal the hydrogen produced ignites explosively on the surface of water .What cause the ignition
Answer:
Pottasium reacts with water vigorously and the reation is exothermic. The heat released causes the hydrogen released to ignite
Explanation:
Which material would take the longest to cool off once heated?
Liquid water
Lead
Ice
Copper
Answer Liquid water
Explanation: I'm sure its that answer
Which equation is derived from the combined gas law?
Answer:
First one. V1/T1=V2/T2
If the pressure is the same.
Explanation:
Answer:
A on edge2021
Which of the following represents a double-displacement reaction?
a. ABC ➡️AB +C
b. A+B ➡️AB
c. AB + CD➡️AD + CB
d. A + BC ➡️AC + B
when discussing Solutions the amount of solute dissolved in the solvent is important to know as it will affect the colligative properties of a solution a pure illusion prepared by dissolving the maximum amount of solute in a given amount of solvent is best described as
I hope it helps
thanks you
Which countries have a Desert biome?
Mexico
China
Ireland
India
Brazil
Saudi Arabia
United States
"Desert biome?" that's a funny way to put it. Well, the answer is most likely Mexico, United Stated, and Saudi arabia,
Mexico, Saudi Arabia and United States are countries which have a desert biome.
What is a Desert?
This is a barren area of landscape which is characterized by little precipitation and isn't best suited for plant or animal life.
Mexico, Saudi Arabia and United States all have the presence of desert biomes in some of its states.
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The empirical formula for butene is
A.
CH2
B.
C₂H4
C.
Ca HG
D
C4H8
How many moles are 4.20 x 1025 atoms of Ca?
Answer:
4305
Explanation:
please mark this answer as brianliest
How does sodium become a negative ion of neon
what is chemical reaction
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Pedro adds 3.23 moles of helium to a balloon that already contained 4.51 moles of helium creating a balloon with a volume of 9.87 liters. What was the volume of the balloon before the addition of the extra gas?
Answer:
7.The answer is 2.13 because if u add 3.23 and 4.51 and the answer is 7.74 and u add 2.13 to get 9.87. 3.23 + 4.51 + 2.13 is 9.87
Explanation: