Thermal energy is another name for–
A. sound energy
B. light energy
C. heat energy
D. mechanical energy.
Explanation:
heat energy is another name for thermal energy
This is an impossible formula. If it were real, determine the molar mass of:
Cr4(PO4)3
Answer:
Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol
Explanation:
First, collect the individual molar masses of each element. These values are found on the periodic table under each respective element.
Chromium (Cr): 51.996 g/mol
Phosphorus (P): 30.974 g/mol
Oxygen (O): 15.999 g/mol
The quantity of each element is determined by the subscript next to it. If their is a subscript directly to the right of a set of parentheses, multiply each element within the parentheses by the subscript.
Chromium (Cr): 4
Phosphorus (P): 1 x 3 = 3
Oxygen (O): 4 x 3 = 12
Finally, the total molar mass of the compound is the collective molar masses of each element times the quantity of each element.
Molar Mass (Cr₄(PO₄)₃): 4(51.996 g/mol) + 3(30.974 g/mol) + 12(15.999 g/mol)
Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol
On a warm, pleasant day, you notice some clouds in the sky. The clouds are very high up in the sky and look quite thin.
tell me Which type of clouds are in the sky?
cirrus
cumulus
stratus
fog
Answer:
their citrus clouds
Explanation:
I looked it up on the internet
Nitroglycerine (C3H5(NO3)) is a powerful explosive. The products of this reaction are
elemental oxygen, elemental nitrogen, water, and carbon dioxide. The Gibbs free energy for this
reaction is negative at 273 K. Determine whether the reaction is spontaneous.
The Gibbs free energy describes the spontaneity of the chemical reaction. The reaction involving nitroglycerine is spontaneous.
What is spontaneity?Spontaneity is the condition of the reaction that continuously makes the product without adding input energy again and again. It is determined by the Gibbs free energy of the system.
When the Gibbs free energy of the thermodynamic system is negative then the reaction is said to be exothermic and is a spontaneous reaction. The negative Gibbs free energy of nitroglycerine at 273 K shows spontaneity.
Therefore, the reaction is spontaneous.
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7. How many molecules are in 4.80 moles of NaCL?
Answer:
280gr of salt
Explanation:
4.80 x ( 22.99 + 35.45) = 280gr
Simple as that
Which of the following, in the solid state, would be an example of a metallic crystal?
1. carbon dioxide
2. barium fluoride
3. diamond
4. iron
5. None of these
At equilibrium,
a, the forward reaction rate is lower than the reverse reaction rate.
b. the forward reaction rate is higher than the reverse reaction rate.
c. the forward reaction rate is equal to the reverse reaction rate.
d. po reactions take place.
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C. the forward reaction rate is equal to the reverse reaction rate
Chemical equilibrium is dynamic in nature and it can be attained only if the system is a closed one. At equilibrium the forward reaction rate is equal to the reverse reaction rate. The correct option is C.
What is chemical equilibrium?The state of a system in which the measurable properties of the system do not undergo any further noticeable change under a particular set of conditions is called the state of equilibrium. The properties like pressure, concentration, etc. is constant at equilibrium and remain unchanged thereafter.
An equilibrium can be attained from either direction, i.e., from the direction of the reactants as well as from the direction of the products. At equilibrium the rate of forward reaction is equal to that of the backward direction.
In forward reaction, the reactants are converted into products and in backward reaction, the products are changed into the reactants.
Thus the correct option is C.
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How do hydrogen ions exist in a solution?
Sample Response: According to the passage, a singularity is a single point of densely packed matter that sits at the center of a black hole. In other words, there's a lot of matter packed really tightly together, making it really heavy. This heavy bunch of matter is squished into the tiny space at the middle of a black hole.
Which details did you include in your explanation? You can check more than one answer.
I included text evidence that helped me to figure out what a singularity is.
I simplified the complex language using my own words.
I made a comparison or gave an example to help me explain.
I used synonyms and antonyms to help me explain.
The details included in the passage are I simplified the complex language using my own words. The correct option is B.
What is a passage?A passage is a group of paragraphs which talks about a topic. We have to read the passage and then answer the question.
The given passage talks about black hole, it is a center of powerful gravitational force
Thus, the correct option is B. I simplified the complex language using my own words.
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Water is weird because in the solid-state the molecules are ________then when water is in its liquid state all other liquid to get ________when they freeze solid
Answer:
Water is weird because in solid state The molecules are combine then in liquid state they are wide apart.
How would a scientist classify a centipede? 12 points!!! pls help.
A. Arthropod
B. Amphibian
C. Mammal
D. Reptile
50 POINTS PLEASE ANSWER QUICK (bad answers will be reported)
Donna is studying phase changes. She claims that since the three phases have different amounts of energy, molecules in substances gain or lose energy only during phase transitions. What is incorrect about this claim?
Molecules gain or lose energy during any temperature change, not just phase changes.
Molecules do not have any energy changes, because they have a set amount of energy all the time.
Molecules are constantly losing energy, no matter what phase change is happening.
Energy levels are not related to phase changes.
Answer: Molecules gain or lose energy during any temperature change, not just phase changes.
Explanation:
If you think of a heating or cooling curve, even when there isn't a phase change, the kinetic energy of the particles is still changing.
104 Equilibrium Constant 2
The toxic gas phosgene decomposes to a limited extent to carbon monoxide and chlorine at a certain temperature T K
according to the following equation:
COCI₂(g) CO(g) + Cl₂(g)
The equilibrium constant, Kc, is 0.00045 at this temperature.
What is the equilibrium constant for the reverse reaction?
Give your answer with 2 significant figures in the exponential form, for example, 1.5e3 for 1500.
From the calculations, the equilibrium constant of the reverse reaction is 2.22 * 10^3.
What is equilibrium constant?The term equilibrium constant refers to a number that shows the extent to which reactants are converted into products.
We can see that the equation is COCI₂(g) CO(g) + Cl₂(g) having Kc = 0.00045. The equilibrium constant of the reverse reaction is; 1/0.00045 = 2.22 * 10^3.
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Calculate the mass (in grams) of 3.85 x 1024 carbon atoms.
Round your answer to two decimal places.
Answer:
You can get to the answer in two steps:
calculate: 3.40⋅1022 atoms = x mol ?
using Avogadro's constant.
calculate: x mol = ? grams,
using the atomic mass of Helium.
Step 1
Avogadro's constant says that 1 mole of any atom contains 6.022⋅1023 atoms. In this case you have 3.40⋅1022 atoms:
3.40⋅1022atoms6.022⋅1023atomsmol = 5.65⋅10−2mol
Step 2
The atomic mass of helium (He) will give you the weight of one mole of this molecule: 1 mol = 4.00 gram:
4.00gmol⋅5.65⋅10−2mol = 0.226g
So the 3.40⋅1022 helium atoms weigh 0.226 gram.
The results of the gold foil experiment led to the conclusion that an atom is
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The nucleus of an atom of the element is positively charged and atom has a hollow space inside it.
Explanation:
This experiment was conducted by Rutherford in this experiment. He placed a gold foil and surround it with a screen.
And He exposed gold foil in alpha particles rays in which he noticed that most rays passed through atom which conclude that atom has a large space, some rays get deflected and some reverse their path this show that the positive charge of nucleus of an atom.
what are chemistry products
Answer:
Products are the species formed from chemical reactions. During a chemical reaction reactants are transformed into products after passing through a high energy transition state. This process results in the consumption of the reactants.
Explanation:
hope this helps if not let me know have a great day
Using the Equilibrium Solubility Constant
Some carbonate compounds have limited solubility.
MCO3(s) M²+ (aq) + CO3²- (aq)
The solubility constant Ksp for a carbonate compound MCO3, Ksp = 2.5E-7.
A saturated solution of the compound MCO3, is made.
Calculate the concentration of the ions M²+ (aq) and CO32-(aq) in the saturated solution (check the stoichiometry, the
ions will have the same concentration).
Give your answer to three significant figures, using the exponential format, example enter 0.0000382 as 3.82e-5
with no gaps and the -ve e if power is -ve.
Answer:
The solubility product constant (Ksp) describes the equilibrium between a solid and its constituent ions in a solution. The value of the constant identifies the degree to which the compound can dissociate in water. The higher the Ksp, the more soluble the compound is.
Answer:
MCO3(s) M2+(aq) + CO32-(aq) The solubility constant Ksp for a carbonate compound MCO3, Ksp = 2.83E-7. A saturated solution of the compound MCO3, is made.
Explanation:
Why do a human and monkey look different? the location of the DNA in a cell the type of cells the organization of cell structures the DNA sequence
Answer:
DNA sequence
Explanation:
When we say our DNA is different , we mean the sequence, or coding, of DNA is different
Sugar (C12H22011) is a molecular substance. Which of the following properties would you expect it to
have?
a. conducts electricity in water
b. doesn't dissolve in water
c. held together by opposite charges
d. low melting point
Milk in a bottle has a mass of 442grams and a volume of 425cubic centimeters. Calculate its density. Write your answer to the hundredths place. gramspercubic centimeter
Answer:1.04 grams per cubic centimeter
Explanation:
What is the molar mass of fluorapatite (Ca5(PO4)3F)?
Answer: 504.3
Explanation: Add the respective weights of each of the elements in the compound together.
When the atoms that are transition elements form ions, the __ electrons are lost before the _electrons are lost.
Answer:According to the Aufbau principle, the electrons fill the 4s sublevel before beginning to fill the 3d sublevel. However, the outermost s electrons are always the first to be removed in the process of forming transition metal cations.
Explanation:hope its help
How old is a piece of cotton cloth if the half-life of carbon-14 is 5,730 years, and the carbon-14 composition of the cloth is 22 percent that of living plants?
Question 1 options:
A)
1,813 years
B)
1.21 × 10-4 years
C)
12,517 years
D)
1.21 × 10-4 years-1
The half-life is the time used by the concentration to get half of its initial value. The cotton cloth is 5097 years old.
What is radioactive decay?Radioactive decay is the reduction of the initial concentration to the half value. The exponential decay can be given as:
[tex]\rm N(t) = N_{0}e ^{-\lamda t}[/tex]
The decay constant is calculated as:
[tex]\begin{aligned} \lamda &= \rm \dfrac {ln (2)}{t\frac{1}{2}}\\\\&= \dfrac{\rm ln(2)} {5730}\\\\&= 0.0001209\end{aligned}[/tex]
Solving further:
[tex]\begin{aligned}0.22 &= \rm e^{-0.0001209 \times t}\\\\\rm ln 0.22 &= -0.0001209 \times t\\\\\rm t &= \rm \dfrac{log 0.22}{-0.0001209}\\\\&= 5097 \;\rm years\end{aligned}[/tex]
Therefore, the cotton cloth is 5097 years.
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8. Which of the following is NOT true of atoms?
a. They are composed of molecules.
b. They combine to form compounds. c. They make up elements.
d. They are extremely small.
Answer:
The correct answer should be (A)
Explanation:
This is bcos its atoms ions and molecules that make up matter
Explain how friction is involved in energy transformation.
Answer:
Friction also prevents an object from starting to move, such as a shoe placed on a ramp. When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.
Friction is involved in energy transformation considering the fact that When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.
Friction also prevents an object from starting to move, such as a shoe placed on a ramp.
In other words, opposing force is known as friction. The type of friction that acts on an object that is not moving is static friction.
Static friction serves as a kind of friction that do occur between two object that are not moving which means the object are static in nature.
Thats why during rainy season while walking on slippery roads people wear shoes with spikes which prevents a person from slipping into mud by the action of friction.
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For the reaction
2 HCl + Na2CO3 → 2 NaCl + H2O + CO2
179.2 liters of CO2 is collected at STP. How
many moles of NaCl are also formed?
Answer:
16 mol NaCl.
Explanation:
Do the train track method to cancel out all the units except moles of NaCl on top. Remember one mole of any gas occupies 22.4 L at STP.
179.2 L CO2 x 1 mol CO2/22.4 L CO2 x 2 mol NaCl/1 mol CO2
= 16 mol NaCl
(d) Explain the trend in the boiling points in the table above.
Answer:
The BP increases in temperature as you move down the halogen group ( group 7)
Answer:
The trend of boiling points in the the table vary according to the size of the elements atom, if an element has a larger size it will need greater intermolecular forces and heat to break the strong bonds. Therefore Bromine has a larger size followed by chlorine and later fluorine, and this has shown in their boiling points
How many covalent bonds must each carbon atom have around it in an organic or biochemical molecule? 1 2 3 4
Answer:
4 covalent bonds
Explanation:
Each carbon atom can form as many as four covalent bonds with other carbon atoms as well as with other elements. Be able to explain why this is so. Be able to list the four main groups of organic molecules and their functions in living things.
Charle's Law
At 27.00 °C a gas has a
volume of 6.00 L. What will
the volume be at 150.00 °C?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert temperature to Kelvin
27°C=300K150°C423KApply Charles law
V1T2=V2T16(423)=27V22538=27V_2V2=94LWill the following compounds create solutions? Explain your answers.
Solvent Solution? Y/N Explain
Solute
Nal
H₂O
KBr
CH₂
CO₂
CF₁
LICI
CCI
NH₂
H₂O
CO₂
H₂O
The following compounds create solutions that are listed below
What is a solution ?A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.
solvent: the substance in which a solute dissolves to produce a homogeneous mixture
solute: the substance that dissolves in a solvent to produce a homogeneous mixture
1. Nal and H₂O
It will form an ionic solution .
2. KBr and CH4
It will not form a solution
3. CO₂ and CF₄
It will not form a solution
4. LiCI and CCl₄
It will not form a solution
5. NH₃ and H₂O
It will also form a solution and liberate ions of ammonium
6.CO₂ and H₂O
It will form a solution named as carbonic acid
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