Answer:
breathing is inhaling and exhaling of gases between the cells in the environment.
respiration is the biochemical process that happens in the cell. this process releases energy from organic compounds that are then used for performing activities
Explanation:
Calcular el porcentaje de cada elemento en los compuestos químicos dados.
1. KNO3 (Nitrato de potasio: fertilizante): %K=? , %N=? , %O=?
Answer:
%K=38,6% %N=13,86% %O=47,54%
Explanation:
%K=M K/M KNO3
=39/101
=38,6%
%N=14/101
=13.86%
%O=100%-%K-%N
=100-38,6-13,86
=47,54%
Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died out to about 60,000 years. The atomic number of C is 6, and of N is 7. 14C and 14N have the same: Group of answer choices
Answer:
The correct answer is - mass number.
Explanation:
The atomic number the number of electrons or protons present in a neutral atom.
Atomic number = Number of electrons = Number of protons
Whereas, the mass number the sum of the number of protons and the number of neutrons present in an atom.
Mass number = Number of protons + Number of neutrons
For C-14 and N-14:
C-14 isotope:
Atomic number = number of proton = number of electron = 6.
Mass number = 14
Number of neutrons = 14 - 6 = 8
In N-14 isotope:
Atomic number = number of proton = number of electron = 7
Mass number = 14
Number of neutrons = 14 - 7 = 7
Thus, these two isobars have same mass number.
Which of the following answer describes 1-pentyne?
O structure should have 5 carbon with double bond beginning on the 1st carbon atom
O structure should have 6 carbon with triple bond beginning on the 1st carbon atom
O structure should have 6 carbon with double bond beginning on the 1st carbon atom
O structure should have 5 carbon with triple bond beginning on the 1st carbon atom
Answer:
The answer is that the structure should have 5 carbon with triple bond beginning on the 1st carbon atom.
Explanation:
The structure will have 5 carbons since the -pent prefix means 5 carbons.
The structure has a triple bond because the -yne suffix means that the structure is an alkyne. An alkyne is a hydrocarbon with triple covalent bonds.
Also, the position of the triple bond is known because the nomenclature of the alkyne states that the triple bond is on the 1st carbon.
What is the percent yield of a reaction that has a theoretical yield of 50.0 grams of product but after an experiment you only collect 40 grams of product?
May solution ba o wala tanong kolang
The percent yield of a reaction is 80%
The theoretical yield of the product is 50.0 g
The actual yield of the product is 40 g
We need to calculate the percent yield of the reaction.
What is the percent yield?
The percent yield describes the ratio of the actual yield and the theoretical yield expressed as a percentage value.
The formula of percent yield is shown as
[tex]Percent\ yield =\ \frac{actual\ yield} {theoretical\ yield} \times 100[/tex]
Now, putting the given values as
[tex]Percent\ yield =\ \frac{40} {50} \times 100[/tex]
Percent yield = 80 %
Therefore, the percent yield of a reaction is 80%
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help me balence: ___ H2 + ___ O2----> _____ H20
Explanation:
2H2+O2------->2H2O
its yr balanced equation.
hope it helps
stay safe healthy and happy....A mixture of He, Ne, and N2 gases has a pressure of 1.943 atm. If the pressures of He and Ne are 0.137 atm and 0.566 atm, respectively, what is the partial pressure of N2 in the mixture?  A. 0.703 atm  B. 1.24 atm  C. 0.151 atm  D. 1.943 atm
Answer:
The parcial pressure of N₂ in the mixture is 1.24 atm.
Explanation:
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
PT = PA + PB
This relationship is due to the assumption that there are no attractive forces between the gases.
In this case:
PT=PHe + PNe + PN₂
You know:
PT= 1.943 atmPHe= 0.137 atmPNe= 0.566 atmPN₂= ?Replacing:
1.943 atm= 0.137 atm + 0.566 atm + PN₂
Solving:
1.943 atm= 0.703 atm + PN₂
1.943 atm - 0.703 atm= PN₂
1.24 atm= PN₂
The parcial pressure of N₂ in the mixture is 1.24 atm.
What do electrons Do in ionic bond? Do they transfer from metals to no metals or nonmetal to metals?
Answer:
electrons get transfered from metals to non metals in the formation of ionic bond.
metals have the tendency to lose electrons whereas non metals tend to stabilize by gaining electrons.
Which rock among the given rocks is most likely to erode away the fastest?
Please give 1 answer.
A.
Marble
B.
Granite
c
.
Sandstone
D.
Basalt
Answer:
The answer is B............
Answer:
b. Granite
Explanation:
Soft rock like chalk will erode more quickly than hard rocks like granite. Vegetation can slow the impact of erosion. Plant roots adhere to soil and rock particles, preventing their transport during rainfall or wind events.
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Hippos spend most of their time in rivers, but they come out of the water to eat grass. Right now, it's the middle of the night. The sun is not shining, and the hippos are not eating. What is happening to the carbon in the air around the hippos and the grass nearby?
increases/decreases from left to right across a period.WHY do we observe this periodic trend?
Answer:
don't no answer
Explanation:
d don't no answer
If 0.500 moles of silver nitrate were consumed, how many moles of calcium nitrate would be produced?(make sure to balance the chemical equation first)
AgNO3 + CaCl2 → Ca(NO3)2 + AgCl
Answer:
Explanation:
AgNO3 + CaCl2 ⇒ Ca(NO3)2 +AgCl
2AgNO3 + CaCl2 ⇒ Ca(NO3)2 + 2AgCl
The temperature of evaporation is much higher for water than for alcohol. Without knowing more about the chemistry of alcohol, which of the following is the most logical chemical explanation for this phenomenon? Group of answer choices Ionic bonds form between alcohol molecules. These are the weakest type of bond and are easier to break than the hydrogen bonds between water molecules. Fewer hydrogen bonds form between alcohol molecules. As a result, less heat is needed for alcohol molecules to break away from solution and enter the air. Alcohol has a higher surface tension than water. This means that alcohol molecules can easily break away from other alcohol molecules and evaporate at a lower temperature. Alcohol molecules are more cohesive than water molecules. This means that as alcohol molecules evaporate, they pull other alcohol molecules into the air along with them.
Answer:
Fewer hydrogen bonds form between alcohol molecules. As a result, less heat is needed for alcohol molecules to break away from solution and enter the air.
Explanation:
Hydrogen bonding is a kind of intermolecular interaction that occurs when hydrogen is bonded to a highly electronegative atom.
Both water and alcohols exhibit hydrogen bonding. However, alcohols exhibit fewer hydrogen bonds than water.
As a result of this, the temperature of evaporation is much higher for water than for alcohol because hydrogen bonds hold water molecules more closely than alcohol molecules are held.
what is the volume of 72g of copper has a density of 9/cm 3
Answer:
8cm³
Explanation:
density = mass/volume
or volume = mass/density
= 72/9
= 8 cm³
A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher's head?
O chemical
O kinetic
O nuclear
O thermal
The simple activities like walking, jumping, throwing and falling usually involves kinetic energy. Here the energy of ball when a baseball player hits a ball is kinetic energy. The correct option is B.
What is kinetic energy?The kinetic energy of an object is defined as the measure of the work that an object does by virtue of its motion. When work is done on an object, energy is transferred and the object moves with a constant speed. This energy transferred is kinetic energy.
It is possible to transfer kinetic energy between objects and can be transformed into other form of energy. The SI unit of kinetic energy is Joule and it is proportional to the square of velocity and mass of the object.
Here the moving ball has kinetic energy due to its stae of motion.
Thus the correct option is B.
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explain observation made when anhydrous calcium chloride and anhydrous copper (ii) sulphate are separately exposed to the atmosphere for about two days
Answer:
Anhydrous calcium chloride dissolves and becomes liquid
Anhydrous copper (ii) sulphate will produce crystal particles
Explanation:
Anhydrous calcium chloride is deliquescent and hence when it is exposed to air, it absorbs water from air. After absorbing water, it dissolves and after some time a pool of clear liquid appears.
Anhydrous copper (ii) sulphate will form crystal structures and the following reaction will takes place
CuSO4 + 5 H20 --> CuSO4.5H2O
Unit Test Review
Active
1
2
3
According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to
another?
O The volume and the shape stay the same.
O The volume increases to fill the new container, but the shape stays the same.
O The volume stays the same, but the shape changes to fit the new container
O The volume and the shape change to fill the new container
Answer:
the volume stays the same, but the shape changes to fit the new container
Explanation:
because the same amount/volume of liquid is being placed in a new container, the new container has a different shape to the old, thus changing the liquids shape but not volume.
Explain why elements with less protons require fewer neutrons to be stable compared to elements with more protons.
Answer:
The reason for this is because of the repulsive force between protons: The stronger the repulsion force, the more neutrons are needed to stabilize the nuclei.
Explanation:
One atom has 11 protons and 13 neutrons. Another has 11 protons and 12 neutrons. Are they the same or different elements? Explain your answer
Answer: Both the given species are isotopes of the same element.
Explanation:
An isotope is defined as the chemical species that have the same atomic number but a different mass number.
The atom consists of 3 subatomic particles:
Protons: They are positively charged particles present in the nucleus of an atom. Electrons: They are negatively charged particles present in the orbits around the nucleus of an atom. Neutrons: They are neutral particles present in the nucleus of an atom.An atomic number is defined as the number of protons or number of electrons present in a neutral atom. It remains specific for a particular element.
Mass number is defined as the sum of the number of protons and neutrons present in the nucleus of an atom.
Given values:
For isotope 1:
Number of protons = 11 = atomic number
Number of neutrons = 13
Mass number = 11 + 13 = 24
For isotope 2:
Number of protons = 11 = atomic number
Number of neutrons = 12
Mass number = 11 + 12 = 23
As the atomic number of both the isotopes is the same. Thus, they belong to the same elements.
Which statement about Niels Bohr’s atomic model is true?
Answer:
Each orbit has a specific energy level.
Would you mind marking it the brainliest:).
Please tell me the answers
which one is mixture or solution
I will mark him or her as well done brilliant and thank you
Answer: Milk and chocolate/ oil and water are solution whereas fruit salad and air are mixtures
The table shows data from an experiment designed to find a solution that is both an acid and a strong electrolyte. Based on the data, which solution is the best acidic electrolyte.
Solution 1, 2, 3, or 4? Thank you!!!
Answer:
Solution 4 is the best acidic electrolyte
Explanation:
An acidic medium such as a solution has a pH that is less than 7. The acidity of the medium increases with decrease in the pH value. Acidic solutions turn blue litmus solution red. They produce hydrogen ions as positive ions solution as well as a negatively-charged ion.
An electrolyte is a solution which allows electric current to pass through it and in the process is decomposed by the electric current. Electrolytes are able to allow current flow through them because they are composed of negatively and positively-charged molecules known as ions which are responsible for carrying electrical charges. A good electrolyte will be a solution which conducts electricity freely.
Based on the data in the table, the solution that is both acidic and has high electrical conductivity is solution 4. Solution 4 turns blue litmus solution red indicating that it is acidic. Also, it has a low pH of 2.0 indicating that it is very strongly acidic.
Therefore, solution 4 is the correct option.
Ernest Rutherford gold foil experiment established that
mass of an atom is concentrated in the nucleus
A female rabbit had 4 babies. For phenotypes: two of the babies were black and two of the babies were white. In rabbits, the allele for black fur (B) is dominant to the allele for white fur (b). Identify the genotypes of the mom and dad rabbit and complete the Punnett square to show how the 4 babies got their fur color.
Answer:put the rabbits mixed
Explanation:
What is the hydrogen ion concentration of 0.450M solution of acetic acid (HC2H3O2), if the ionization constant(Ka) is 2.19 x 10-5?
Answer:
3.02 Mm
Explanation:
best example of heterogeneous mixture
Answer:
examples include ice cubes in a drink, sand and water, and salt and oil.
explain what you understand by valency, give examples
Answer:
Valency is defined as the number of hydrogen atoms which combine directly or indirectly with one atom of an element.
Example:
One atom of nitrogen combines with three atoms of hydrogen to form ammonia gas. So, the valency of nitrogen is 3.
5. Which particle can not be accelerated by the electric
or magnetic fields in a particle accelerator?
A) neutron
B) proton
C) alpha particle
D) beta particle
Answer:
A. neutron
Explanation:
Neutrons cannot be accelerated in an electric or magnetic field because they are neutral in charge.
1. The motion of an object with constant acceleration is also known as ________. *
Motion
Uniform Motion
Constant Motion
Uniformly Accelerated Motion
2. A sepaktakraw ball is hit vertically upward by a player. What is its acceleration after 1 second? *
0
1 m/s2
19.8 m/s2
-9.8 m/s2
3. If a freely falling ball is somehow equipped with a speedometer, by how much would its speed-reading increase for every second? *
0 m/s
9.8 m/s
10 m/s
20 m/s
4. It is any motion of a body where gravity is the only force acting upon it (no friction or air resistance). *
freefall
gravity
acceleration
velocity
5. Objects fall at constant acceleration also known as acceleration due to gravity equivalent to *
1 point
9.8 m/s
9.8 m2/s
-9.8 m/s2
20 m/s
For questions 6-10, consider the illustration below.
6. At what angle of release makes the projectile reach the maximum height? *
15°
30°
45°
60°
75°
60° & 30°
30° & 75
7. Which of the following pairs of angles will make projectiles reach the same range? *
15°
30°
45°
60°
75°
60° & 30°
30° & 75
8. Which angle of release makes the projectile reach the longest range? *
15°
30°
45°
60°
75°
60° & 30°
30° & 75
9. Which angle of release are complementary angles? *
15°
30°
45°
60°
75°
60° & 30°
30° & 75
10. At what angle should a water hose be aimed for the water to land with the greatest horizontal range?
15°
30°
45°
60°
75°
60° & 30°
30° & 75
11. Which of the following statements describes momentum? *
the product of body's mass and velocity
the sum of body's mass and velocity
the product of body's mass and acceleration
the sum of body's mass and acceleration
12. Two identical cars are travelling along EDSA. Which of the two cars would have a greater momentum? *
the slower car
the faster car
both have the same momentum
13. Which has more momentum, a huge truck that is not moving or a bicycle that is moving? *
truck
bicycle
both have the same momentum
14. What are the two factors that affect the momentum of an object? *
velocity and time
force and velocity
mass and velocity
acceleration and force
15. Which has more momentum, a heavy truck moving at 30 km/h or a light truck moving at 30 km/hr? *
heavy truck
light truck
both have the same momentum
Answer:
i can't answer sorry
Explanation:
i had confused
Substance ‘A’ has a high melting point, the arrangement of particles are closely packed and it can conduct electricity.
What state is substance 'A'
Answer:
solid state...........
How many neutrons are present in an atom with atomic number 9 and mass number 19?
Answer:
10 neutrons
Explanation:
N=Z-A ie. number of neutrons=mass number-atomic number
N=19-9=10
