Answer:
C
Explanation:
the enthalpy of reaction is independent of the reaction path
The statement with related to the Hess's law should be the enthalpy of reaction that does not based on the reactions.
What is Hess's law?It is also called as the Hess's law of constant that should be heat summation. In the year 1840 here the heat should be absorbed or it should be evolved or there should be changed in the enthalpy with respect to the chemical reaction that contain the fixed quantity.
Therefore, we can conclude that the option c is correct.
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Q8: If you blow up a balloon, and then release it, the balloon will fly away. This is an example of
Which of Newton’s law is it first second or third
Answer:
it it the first law
Explanation:
Answer:it is an example of Newton’s 3rd law
Explanation:the balloon had a reaction
what are things that we can eat or drink to make our stomach less acidic?
Answer:
Opt for foods low in sugar and fat and high in fiber.
Explanation:
Any noncitrus fruits, oatmeal, leafy green vegetables, ginger is excellent for heartburn and stomachaches.
GIVING AWAY 70 PTS AND BRAINLIEST ANSWER QUICK!
Which of the following techniques can be used to separate a heterogeneous mixture into its component parts? A Sort by colour B Separation by density C Apply heat D Apply pressure
Answer:
i think it might be separation by density
Explanation:
Answer:
B: Sort by density
Btw im not copying the person above me. I am 98% Sure its density
{b}
In experiment B. the iron filings weighed 2.0g at the beginning of the experiment
and the iron sulphide produced weighed 2.8g.
Explain this increase in mass.
Explanation:
The increase in mass is because the iron fillings have combined with a sulfide to produce iron sulfide and so the mass will increase.
In such a reaction like this, the mass of the reactants must be conserved. By so doing, the mass of reactants and products must be the same.
When two substances combine together, their masses added up to that of the individual masses. This helps to conserve the mass.
What does a particular point on a line of a phase diagram represent ?
Answer:
the line represents the condition where pressure and heat have the same effects.
Answer: C) The melting point of a substance at a specific pressure.
Over the evolutionary history of a certain kind of fish, the trend is for an increasing number of teeth. The data table provides information for several examples. A fossil of a new species of this type of fish (W. amatequorum) is discovered. The complete fossil skeleton is found, and it has 34 teeth. The most reasonable estimation for the age of this fossil would be which of the following?
The length breadth and thickness of a brick is 18cm 8 cm and 5cm respictively find the area of the widest part of rhe brick
Answer:
144cm²
Explanation:
Given dimensions:
Length x breadth x thickness
18cm x 8cm x 5cm
The widest part of this figure will be the face containing the length and the breadth.
The breadth is the width of the figure;
Area of the widest part = length x breadth = 18cm x 8cm = 144cm
The area of the widest part of the figure is 144cm²
PLEASE HELP I'M DOING THIS IN CLASS RIGHT NOW
Explain exactly why metals are such good conductors according to the video you just watched. 2. Which conducts heat more efficiently- a solid, liquid or gas? Why is that (explain on molecular level)?
Answer:
hope this helps have a amazing day! :)
Explanation:
Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.
Birthday candles are lit on your cake
Physical change or chemical change?
Answer:
Physical change
Explanation:
while the wax is melting its still wax no chemical change
hope this helps :3
if it did pls mark brainliest
How many sig figs in each?
-27.43
-1.90
-101
How does cold water affect the speed of dissolving?
Answer:
Anything that can be done to increase the frequency of those collisions and/or to give those collisions more energy will increase the rate of dissolving.
Explanation:
depended on the temperature
PLS I NEED HELP!! Lucia wants to arrange the four states of matter from lowest kinetic energy to highest kinetic energy. How should she arrange them?
A. liquid, solid, plasma, gas
B. liquid, solid, gas, plasma
C.solid, liquid, plasma, gas
D. solid, liquid, gas, plasma
Answer:
Basically, the more hot the state is, the more kinetic energy it will have. This means that answer D. would be right, as it goes from coldest to hottest states!
Answer:
The answer is D. solid, liquid, gas, plasma
Explanation:
How many joules are required to raise the temperature of 55.0 g of H2O(l) from 15°C to 45°C?
A. 8155.3 J
B. 551100 J
C. 1650 J
D. 6903.6 J
Answer: is C=1650j because 45^0 evaluate the power. 1c the coefficient of 1 doesn't have to be written, so the answer particularly be C.
Explanation: I hope that helped !
Which wil be the lower number Atomic Number of Atomic Mass?
-A Whatever
B.DK .
c. Atomic Number
Die Atomic Mass
Answer:
atomic mass
Explanation:
Answer:
The atomic number
Explanation:
The atomic number is the number on the bottom, as for the atomic mass it's the top. You just have to memorize that.
A person aims for a target with a wooden bow and arrow. The image shows the path of the arrow to the target. How can the person increase the elastic potential energy in this situation? A) aim the bow higher, increasing the height of the arrows flight. B) sharpen the arrows tip, causing it to strike the target with more force. C) change the bow’s material, increasing the stiffness of the bow. D) pull the arrow farther back, increasing the stretch of the bows string.
Answer:
d
Explanation:
Which evidence is an indication that a chemical reaction has occurred?
a.melting substance
b.boiling substance
c.frezzign of substance
d.formation of a gas
Answer is D formation of gas.
Explanation: I hope that helped/have a great day.
If a mineral has a metallic shine and scratches, which of its properties are being measured? Choose the two correct answers.
Metals have shiny surface by which they reflect light. The two properties which can be measured from the metallic shine and scratches in a metal are its luster and hardness.
What are metals?Metals are electropositive elements conducts thermally and electrically. Almost all metals shows a shining property when they reflect light and it is called metallic luster.
Hardness of a metal can be a measure how much the metals resists scratches. Very hard metals do not form powders on scratching. Less hard metals may effect by scratches.
More hard and shining metals have various applications such as in construction fields, optoelectronic devices, thermal coatings and corrosion resistant products.
Hence, option a and b, hardness and luster can be measured from the scratches and metallic shining respectively.
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Your question is incomplete, but most probably your full question was:
If a mineral has a metallic shine and scratches, which of its properties are being measured?
choose the two correct answers.
a. luster
b. hardness
c. magnetism
d. cleavage
Listening is a more complex process than hearing.
Arent listening and hearing and listening the same thing.
Can you help me please
Answer: B
Explanation:
B
Which of the following is the correct name for Cr203?
A. Chromium trjoxide
B. Chromium(III) oxide
O C. Chromium(II) oxide
D. Dichromium trioxide
Answer:
The correct name is Chromium(iii) oxide
If an unknown solution has a pH of 9, what is that solution classified as?
A.Solid
B.Neutral
C.acid
D.Base
Answer:
option A is the ans i think so
If an unknown solution has pH of 9 the solution is classified as a base as it has larger concentration of hydroxyl ions.
What is base?
According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 N. The carriage has __________ energy.
A. Kinetic
B. Potential
Answer:
B
Explanation:
The carriage has potential energy
A photon of light possesses 5 x 10^-19 J of energy. Calculate its frequency
Answer:
The frequency of photon is 0.75×10¹⁵ s⁻¹.
Explanation:
Given data:
Energy of photon = 5×10⁻¹⁹ J
Frequency of photon = ?
Solution:
Formula;
E = hf
h = planck's constant = 6.63×10⁻³⁴ Js
5×10⁻¹⁹ J = 6.63×10⁻³⁴ Js ×f
f = 5×10⁻¹⁹ J / 6.63×10⁻³⁴ Js
f = 0.75×10¹⁵ s⁻¹
The frequency of photon is 0.75×10¹⁵ s⁻¹.
1. Place the molecules in the list in order with the smallest molecules at the top and the largest molecules at the bottom.
= glucose molecule
= starch molecule
= protein molecule
= carbon dioxide molecule
= water molecule
= amino acid molecule
= oxygen molecule
Answer:
Explanation:
In creating this list, one will have to start from the atom (which is the smallest in the list) to the giant polymer (which is the largest in the group). The arrangement below will also be based on there molecular weight.
oxygen molecule (this is the first because it is an atom)
water molecule (this is lighter in weight than carbon dioxide)
carbon dioxide
amino acid molecule (most amino acids have a lesser molecular weight than glucose)
glucose (has a molecular weight of 180.156 g/mol)
protein molecule (several proteins have a lesser molecular weight than starch)
starch molecule (has a molecular weight of 359.33 g/mol)
The arrangement of molecules in the ascending order is: oxygen, water, carbon dioxide, amino acid, glucose, starch, and protein.
• The size of the molecules can be determined by knowing their molecular weights.
• The sum of the atomic weights of the atoms in the molecule is known as the molecular weight of the molecule.
• The molecular weight of water is 18 gram per mole, glucose 180.2 g/mol, starch 360 g/mol, carbon dioxide 44 g/mol, protein 20000 g/mol, amino acid for example glycine 75 g/mol, and oxygen 16 g/mol.
Thus, the molecules can be arranged with the smallest to the largest as oxygen, water, carbon dioxide, amino acid, glucose, starch, and protein.
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which element is found in laundry products?
boron or sulfur
Explain the difference between Carbon-9 and Carbon-14. Which version Carbon do you believe is the most stable? Why? What information could help you confirm your prediction?
correct form of question is
Explain the difference between Carbon-12 and Carbon-14. Which version Carbon do you believe is the most stable? Why? What information could help you confirm your prediction?
Answer:
Carbon has three isotopes those are carbon- 12 , carbon - 13 , carbon-14 among these only C-12 and C-13 are stable while C-14 is radioactive.
C-12 has 6 protons and 6 neutrons , C-14 has 6 protons and 8 neutrons. Atoms with equal number of protons and electrons are generally stable however C-12 and C-14 have 6 electrons but due to excess neutrons present in C-14 makes it undergo radioactivity therefore it is unstable.
How many electrons does gallium give up when it becomes an ion?
Answer:
3 electrons comrade
Explanation:
Which of the following is not an example of biased language?
a.
“You are too short to reach that.”
b.
“Are you deaf?”
c.
“Move along, grandpa!”
d.
“I think I’ve been gypped.”
Answer:
I think it is D.
Explanation:
Answer:
b
Explanation:
How does an increase in reactant concentration affect the rate of reaction?
Answer:
increase the rate of reaction.
Explanation:
Answer:
A. It leads to more frequent collisions, which increase reaction rate.
Explanation:
EDG
Calculate the frequency of a wave that is 4.3 x 10^-11 m the speed of light 5 points
is 3x10^8 m/s *
1 Add file
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