Answer:
b) Exothermic
Explanation:
Exothermic reaction:
The type of reactions in which energy is released are called exothermic reactions.
In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.
For example:
Chemical equation:
C + O₂ → CO₂
ΔH = -393 Kj/mol
it can be written as,
C + O₂ → CO₂ + 393 Kj/mol
what is a normal phase of carbon?
the normal phase of carbon is solid
Which is more acidic – milk of magnesia or lemon juice? What is the difference in acidity between the two? (milk of magnesia = pH 10.5, lemon juice = pH 2.5)
Answer:
Lemon juice because it has more of a sour taste to it than a watery taste like milk
Explanation:
what makes electrons jumo to other orbits around the nucleus then fall again?
Answer:
The higher the excitation state, the more energy the electron contains. When an electron absorbs energy, it jumps to a higher orbital. ... An electron in an excited state can release energy and 'fall' to a lower state.
Answer:
the higher the excitation state, the more the energy the electrons contains. when an electrons absorbs energy , it jumps to a higher orbital.
Explanation:
the electrons with its extra packet of energy becomes excited , and promptly moves out of its lower energy level and takes up a position in a higher energy level
Which of the following describes scientists?
A. People with perfect understanding of science
B. People from different backgrounds
C. People with only one perspective
D. People with similar personalities
Answer:
A. People with perfect understanding of science
PLEASE HELP ME, CHEMISTRY THANKS! :)
The density of water at 4.00°C is 0.967 g/mL. How many molecules of water are present in a 499.8 mL bottle of water? Express your answer to the correct number of significant figures. Be sure to show all steps completed to arrive at the answer.
Answer:
161.69×10²³ molecules
Explanation:
Given data:
Volume of water = 499.8 mL
Density of water = 0.967 g/mL
Number of molecules of water = ?
Solution:
First of all we will calculate the mass of water.
Density = mass/volume
0.967 g/mL = mass/499.8 mL
Mass = 0.967 g/mL × 499.8 mL
Mass = 483.3 g
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 483.30 g / 18 g/mol
Number of moles = 26.85 mol
1 mole contain 6.022×10²³ molecules
26.85 mol ×6.022×10²³ molecules / 1mol
161.69×10²³ molecules
Answer:
density of water at 4.00c is 0.967 g/mL. Volume of water=499.8mL
Mass of water=density x volume= 0.967 x 499.8=483.3066g
Number of moles of water molecules in given of water = givenmass/molarmass=483.3066/18=26.85
we know that 1 mole has 6.022 x 1023 molecules of water
so the number of water=6.022 x 1023 x 26.85=161.69 x 1023 =1.62 x 1025 molecules of water is its upto 3 significant figure.
Explanation:
What is the difference between absorption and scattering
Answer:
scattering is the direction of transmission absorption is the particle absorbs the energy of the photon
Explanation:
What is the name of the compound (NH4)2SO4
An atom with 5 protons, 6 neutrons, and 5 electrons has an atomic mass of __amu. (Enter a whole number.
Numerical Answers Expected!
Answer for Blank 1:
Answer:
3
Explanation:
Diffraction is a wave property that electrons possess
- true
- false
Answer:
The given statement is "True". A further explanation is provided below.
Explanation:
Diffraction occurs mostly with general noise, with electro-magnetic radioactive material, such as visible region, x-ray, but mostly gamma rays, and with very small moving molecules, such as atomic nuclei, as well as electrons, that also have wavelike characteristics. Yet another side effect of diffraction is because there are no dramatic or rapid shadows.Therefore this obvious response is the right one.
The curved upper surface of a liquid in a column of liquid?
Answer:
The answer would be meniscus.
What would red litmus paper be used to determine?
A. If a solution is acidic or neutral
B. If a solution is basic or neutral
C. If a solution is acidic
D. If a solution is supersaturated
Answer:
determines if a solution is acidic.
Explanation:
Nuclear fusion, like the example here, produces huge amounts of energy. Consider the statements below. BUT ONE statement provides more information about nuclear fusion
Answer:
Explanation:
Nuclear fusion of a form of nuclear reaction in which two small atomic nuclei combines to form larger ones with the release of a large amount of energy.
For example;
²₁H + ²₁H → ⁴₂He + Energy
The energy released in a nuclear reaction provides the needed temperature for another set of ²H atoms to fuse. This process in turn yields another ⁴He with the release of a lot of energy. Thus, enormous release of energy accompanies a nuclear reaction.
It is based on this principle that an hydrogen bomb is formed.
Answer:
Where are the answer choices.......
Explanation:
An atom of nitrogen would be stable if it bonded with how many atoms of chlorine?
Help please
When you have two
isotopes of an atom, Carbon-12 and Carbon-13 for example, what has changed in the atomic structure?
A. Number of protons
B. Number of electrons
C. Number of neutrons
What is causing the Hot Springs to be so hot? What is causing Hot Springs to be so acidic?
Answer:
Hot springs are hot because of geothermal heat. The Hot springs are acidic because hydrogen sulfide and carbon dioxide get in touch with water they evaporate which causes acid.
Explanation:
Which statement best describes what happens to the energy of the particles when water vapor begins to cool?
A. The average potential energy decreases.
B. The average kinetic energy decreases.
C. The average potential energy remains the same.
D. The average kinetic energy remains the same.
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the correct option is option B that is average kinetic energy decreases.
What is kinetic energy?It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=1/2mv²
Where,
m= mass of particles
v= velocity of particles
Water vapor condenses when it cools. Water undergoes a phase shift, transitioning from the gas to a liquid. Evaporation is the inverse of condensation. When water vapor begins to cool, average kinetic energy decreases.
Therefore, the correct option is option B.
Learn more about the average kinetic energy, here:
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Question 13 of 32
Which of the following is a scientific question you could ask about apples?
O A. Do red apples contain the same vitamins as green apples?
B. What type of apple do I like best?
C. How many apples do you need to bake an apple pie?
O D. Are red apples prettier than green apples?
SUBMIT
Answer:
A
Explanation:
this should be obvious if you read it haha
how many protons neutrons and electrons does Francium have?
The pressure on a 200-milliliter sample of CO2(g) at constant temperature is increased from 60 kPa to 120 kPa. What is the new volume of the gas?
Answer:
100 milliliter
Explanation:
Initial Pressure P1 = 60 kPa
Final Pressure P2 = 120 kPa
Initial Volume V1 = 200mL
Final Volume V2 = ?
These parameters are related by the following boyle's law which is mathematically given as;
V1P1 = V2P2
Making V2 subject of interest;
V2 = V1P1 / P2
inserting the values;
V2 = 200 * 60 / 120
V2 = 100ml
The density of lead is 11.3g/ml. What is the volume in ml of 50.75g of lead?
Answer:
4.49 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{50.75}{11.3} \\ = 4.491150...[/tex]
We have the final answer as
4.49 mLHope this helps you
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called _____ energy. This quantity is a measure of bond strength since the stronger the bond, the _____ the amount of energy required to break it.
Answer:
Nuclear Binding Energy (Bond Energy), Higher (Greater)
Explanation:
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called Nuclear Binding Energy (Bond Energy). This quantity is a measure of bond strength since the stronger the bond, the Higher (Greater) the amount of energy required to break it.
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called bond energy. This quantity is a measure of bond strength since the stronger the bond, the greater amount of energy required to break it.
I hope this helps!
Using the periodic table, choose the more reactive nonmetal.
Br or As
Answer:
Br
Explanation:
Which chemical equation is balanced?
OA CO, + H,0 - H,CO,
O8 Mg0+ 2HCI - MgCly + H,0
O0 Ca0, + HCI CaCl, + H,0
O0K H,0- K,0 +H,
The chemical balanced : A and B
Further explanationGiven
Chemical equation
Required
Balanced equation
Solution
A chemical equation is said to be balanced if the number of atoms in the reactants and the number of atoms in the product are the same
a. CO₂+H₂O⇒H₂CO₃
balanced
b. MgO+ 2HCI ⇒ MgCl₂ + H₂O
balanced
c. CaO + HCI ⇒ CaCl₂ + H₂O
the elements H and Cl are not balanced
d. K + H₂O ⇒ K₂O +H₂
element K is not balanced
A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.
Which of the following characteristics can be written only in space B?
Occurs in substances that have at least one non-metal
Occurs in substances that have a repeating lattice structure
Occurs in substances that have discrete molecular structure
Occurs in substances that have high melting points
Ionic and covalent bonds can occur in substances that have a repeating lattice structure.
Ionic and covalent bondsIonic bonds are formed when an atom donates electron (s) to another atom. Covalent bonds, on the other hand, are formed when two atoms share electrons to complete their octet states.
Ionic compounds are formed from a combination of metal and non-metal atoms. They usually have crystalline lattice structures with high melting points.
Covalent compounds are formed between non-metal atoms. They can also have lattice structures but generally have lower melting points because the forces holding the molecules together are weaker.
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Answer:
Occurs in substances that have a repeating lattice structure
Explanation:
The substance on which the enzyme acts is called the _____ chemical.
A. Substrate
B. Complex
C. Catalyst
Answer:
the answer is A
Explanation:
it is substrates because ,Enzymes are specialized proteins that catalyze or speed up chemical reactions within cells. The substance upon which an enzyme acts is called a substrate. Substrates are small molecules.
The substance on which the enzyme acts is called the substrate chemical. Therefore, the correct option is option A.
Enzymes are biological molecules that function as catalysts, facilitating and speeding up chemical reactions without being devoured or irreparably changed. The term "substrate" refers to the material that the enzyme reacts with.
An enzyme forms an enzyme-substrate complex when it comes into contact with its particular substrate and attaches to it at a location known as the active site. This contact makes the chemical reaction more rapid than it would be in the absence of the enzyme by lowering the activation energy necessary for the reaction to occur.
Therefore, the correct option is option A.
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Capture energy from sunlight and use it to produce food for the cell; perform
photosynthesis
O cell membrane
O cell wall
O Mitochondria
O chloroplasts
Answer:
The answer is option 4.
Explanation:
Chloroplast is the place where they absorb sunlight to perform photosynthesis to produce food.
If the half-life of substance A is 1.5 years, how long would it take an 8.0 gram sample of stances A to decay such that only 1.0 gram remained?
Answer: 4.5 Years
Explanation:
8 -> 4 -> 2 -> 1
Substance goes through 3 Half-Lives
3 Half-Lives x 1.5 Years = 4.5 Years
Answer:
4.5 i think
Explanation:
What is Newton's First Law known as? The Law of
____
Answer:
inertia
Explanation:
Answer:
Law of inertia, also called Newton's first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Explanation:
hope it helps, please mark brainliest
Na+ is an ion give reasons
Answer:
Na+ represents a sodium atom that has lost an electron.
Explanation:
An atom that has gained or lost electrons is called an ion.
Answer:
I think because of the positive radical it's carrying
In the above picture, suppose the rod was follow instead of solid. Which statement is correct?
Due to convection, glob A will melt faster
Due to conduction, glob C will melt first
Due to convection, glob A will take longer to melt
Due to conduction, glob A will melt faster
Answer:
Due to conduction, glob A will melt faster