Answer:
air
Explanation:
The main source of oxygen molecules is the air around us. Air is made up of 21% of oxygen gas which is the second most abundant gas found in the atmosphere.
Starch, Proteins and food are all made up of complex organic molecules. Air is a mixture of many gases. Gaseous exchange is made possible when air supplies oxygen and takes carbon dioxide away. Oxygen is an essential gas in the metabolic process of animals.Which two statements describe disadvantages of selective breeding? A. Desirable traits that are not selected may disappear in a population B. Selectively bred animals are more likely to have some health problems C. Some desirable traits become more common in a population. D. Selectively bred animals are more likely to provide more meat or milk.
Answer:
B and C
Explanation:
Selective breeding is a procedure that involves the purposeful breeding of selected parents in order to give rise to offsprings with desired traits. Selective breeding procedure has its own advantages, which includes the ability to produce more animal products such as milk, meat etc, however, it has disadvantages.
The disadvantages include that:
- Selectively bred animals are more likely to have some health problem
- Some desirable traits become more common in a population.
A and B
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I took the quiz and got a 100
A student wants to develop a model of an organism's cell that lacks chloroplasts. Which statement BEST explains how the lack of chloroplasts affects an organism?Your answer:An organism that lacks chloroplasts would not be able to convert sunlight into chemical energy through photosynthesis.An organism's cells would not be able to reproduce since the chloroplasts contain the genetic material.An organism that lacks chloroplasts would not be able to manufacture all the protein required by its cells
Recall that the main function of chloroplasts is to convert sunlight to chemical energy, or to carry out photosynthesis. Plant (and eukaryotic algae) cells contain these organelles, while animal cells do not, and hence, animals cannot carry out photosynthesis.
So, a lack of chloroplasts would mean that an organism would not be able to convert sunlight into chemical energy through photosynthesis.
Plants cells, and specifically the chloroplast organelle, are able to absorb sunlight, and together with CO₂ and water, produce glucose (for the plant to eat) and oxygen (which is released into the atmosphere). That glucose is further broken down by the plants' mitochondria. Animals directly consume the glucose to be broken down and converted into energy, hence why we do not have - nor need - chloroplasts in our cells.
a wet 43.2 g sample of copper sulfate heptahydrate is heated until only copper sulfate remains. the mass of the water lost is 34.1 g. what is the mass of copper sulfate
Answer:
9.1g
Explanation:
Given parameters:
Mass of copper sulfate heptahydrate = 43.2g
Mass of water lost = 34.1g
Unknown:
Mass of copper sulfate = ?
Solution
The copper sulfate heptahydrate is made up of the copper sulfate and water of crystallization which makes it wet.
Mass of copper sulfate heptahydrate = mass of copper sulfate + mass of water
Mass of copper sulfate = mass of copper sulfate heptahydrate - mass of water
Mass of copper sulfate = 43.2g - 34.1g = 9.1g
The mass of copper sulphate that is produce from a wet 43.2 g sample of copper sulphate heptahydrate that is heated until only copper sulphate remains (mass of water lost is 34.1 g) is 9.1 grams.
Using the law of conservation of matter, the mass of the reactant is equals to the mass of the product.
Therefore,
CuSO₄7H₂O → CuSO₄ + 7H₂O
mass of CuSO₄7H₂O = 43.2 g
mass of CuSO₄ = x
mass of H₂O = 34.1 g
mass of CuSO₄ = 43.2 - 34.1
mass of CuSO₄ = 9.1 g
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What is the product of the synthesis reaction between calcium and iodine?
Answer:
The product of the synthesis reaction is CaI.
Explanation:
In chemistry, chemical equations are the representation of chemical reactions between elements, compounds, substances, or molecules.
They are written using element symbols (and sometimes including their current state of matter).
Therefore, if we wanted to show the reaction of sodium and chlorine to make sodium chloride, or table salt, we would illustrate it as such:
[tex]\bullet \ \text{Na + Cl} \rightarrow \text{NaCl}[/tex]
A synthesis reaction in chemistry is the combination of two or more elements, compounds, molecules, or substances to make one compound, molecule, or substance.
The parent equation for a synthesis reaction is:
[tex]\bullet \ \text{A + B}\rightarrow \text{AB}[/tex]
Therefore, we need to find out what the element symbols are for both calcium and iodine.
If we reference a periodic table, we will see that calcium is atomic number 20 and has the symbol Ca.
Additionally, when we locate iodine, we will see that it is atomic number 53 and has the atomic symbol I.
Now, we just need to create the reaction equation.
[tex]\text{Ca + I}\rightarrow \text{?}[/tex]
We know that we are dealing with a synthesis reaction, or a combination, so the elements will combine to make one substance.
With this information, we can make an equation:
[tex]\text{Ca + I} \rightarrow \text{CaI}[/tex]
Therefore, the product of the synthesis reaction is CaI.
Note: Please note that "I" is an uppercase i.
the further a star is away from Earth, the more it is
Answer: the more big it is
Explanation:
Answer:
The more it is red shifted.
Hope this helped, have a good day
Explain the saying, “Rome was not built in a day
Answer:
What is the Rome was not built in one day with speech
Which element is not conserved in this unbalanced chemical equation?
2NaOH + H2S04 - NaSO4 + 2H20
Ο Α. Η
O B. S
O c. O
O D. Na
In the given unbalanced reaction, the number of sodium is not balanced. There must have two sodium in the product side also. The correct formula of sodium sulphate is Na₂SO₄.
What is mass conservation law?According to the law of conservation of mass, the total mass of a system is conserved. Thus, mass can neither be created nor be destroyed. Therefore, for a chemical reaction, the total mass in the product side must be equal to the total mass in the reactant side.
The balanced equation of a chemical reaction thus, obeying the mass conservation law where, each element have to be equal in number in both sides.
In the given reaction, the number of Na in reactant side is 2 and that in product side is 1 only. Thus total mass of sodium is not conserved. It can be corrected as Na₂SO₄ in the product side.
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True or false. The greater the distance that the plane moves from an object, the lower the force that will be applied when the action is taken.
Answer:
I think its false-
Explanation:
Answer:
I think it is true i am not sure
Which of these ions has the correct charge?
O2-
B2+
P2-
Li2+
Answer:
B2
Explanation:
"+" contains positivity
write the atomic number of the following: a) phosphorus b) silicon c) chlorine d) argon
Answer:
a,15b,14c,17d,18I hope it helps youAnswer:
a) 15
b) 14
c) 17
d) 18
Explanation:
PLS GIVE BRAINLIEST
A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?
what is a factor of matter
Explanation:
The factor of matter are solubility, boiling point, melting point, temperature, density and reactivity
Why is NCl3 not soluble in water?
Answer:
Explanation:
NCl3 does not dissolve in water because it is a nonpolar molecule which is different with water. NCl3 is nonpolar due to the difference in electronegativities between 3 atoms of Cl and 1 atom if N2.
Answer:
A polar solute dissolves into a polar solvent and a non-polar compound dissolves into a non-polar solvent, this rule is known as "like dissolves like".
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Directions: count each side of the reaction then Circle yes or no if it follows the law of conservation of mass
Answer:
It does follow the law of conservation of mass.
Explanation:
You start with 4 phosphorous atoms and 6 oxygen atoms, you end with 4 phosphorous atoms and 6 oxygen atoms.
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Which of the following is not a good indication that a chemical change has occurred?
A. The formation of gases
B. A change in color
C. A scratched surface
D. The release heat or light
Answer:
C.
Explanation:
The B-group elements of the periodic table do not include: 1) metals. 2) Non-metals. 3) D. Elements
Which chemical equation is balanced?
A. CaO2 + HCl → CaCl2 + H20
B. CO2 + H2O + H2CO2
C. K+ H2O → K20 + H2
D. MgO + 2HCI – MgCl2 + H20
10 points if you answer fast
D. MgO + 2HCI – MgCl2 + H20
Further explanationThe chemical equation is said to be balanced if the number of atoms in the reactants is equal to the number of atoms in the product
A. CaO2 + HCl → CaCl2 + H20
atoms O, Cl and H are not the same
B. CO2 + H2O + H2CO2
atoms O are not the same
C. K+ H2O → K20 + H2
atoms K are not the same
D. MgO + 2HCI – MgCl2 + H20
Mg, left = 1, right=1
O, left=1, right=1
H, left=2, right=2
Cl, left=2, right=2
Chemical equation is balanced
Answer:
B. CO2 + H2O + H2CO2
Explanation:
Why are flowers brightly colored?
Answer: In order to help the plants reproduce, flowers that are bright in color are meant to attract birds, bees and other insects. In the genetics of a flower, bright or dull colors are set in
Explanation:
what occurs at the cathode of a galvanic cell? (sorry about the picture my back camera is broken)
Answer:
The reduction half-reaction of a redox reaction
Explanation:
(just took the test)
The reduction of half-reaction of a redox reaction. Hence, option B is correct.
What is an electrolytic cell?An electrolytic cell converts electrical energy into chemical energy or vice versa.
A galvanic cell is an electrochemical cell in which chemical energy is converted to electrical energy. The chemical reaction which drives a galvanic cell is a redox reaction i.e. a reduction-oxidation process.
A typical galvanic cell is composed of two electrodes immersed in a suitable electrolyte and connected via a salt bridge. One of the electrodes serves as a cathode where reduction or gain of electrons takes place. The other half cell functions as an anode where oxidation or loss of electrons occurs. Batteries and fuel cells are examples of galvanic cells.
Hence, option B is correct.
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Florida is known for long, very warm summers with high humidity. Which of the following is a description of the weather in Florida?
A. Daily thunderstorms are very common in Florida.
B. South Florida has a tropical savanna ecosystem.
C. Florida has a brief annual summer rainfall season.
D. North Florida is known for its humidity.
Answer:
A
Explanation:
The description of the weather in Florida is daily thunderstorms are very common in Florida.
What are thunderstorms?Thunderstorms are lightning storms or electrical storms.
Thunderstorms are caused by unstable warm and cold air.
Lightning, hail and heavy rains happen in thunderstorms.
It causes high damage to houses and properties.
Thus, the correct option is A.
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How are solutions classified? Give an example of each.
What can you say about an atom with a -2 ion of oxygen-17? WILL GIVE BRAINLIEST
Answer:
The mass number of an isotope is indicated in the name of the isotope by writing the name of the element followed by a hyphen and the mass number.
Explanation:
Examples include carbon-14, uranium-235, and oxygen-17.
What type of stress occurs when a rock mass is pushed in opposite directions?
Answer:
Shear stress
Explanation:
Answer:
C-Shearing
Explanation:
Shearing is a type of stress caused when a rock mass is pushed in opposite directions Rocks break and split apart and change shapes. Shearing is common at transform boundaries
increased amounta of carbon dioxide in Earth's atmosphere may lead to global warming. what might global warming then lead to
air temperatures increasing.
If the atomic number of Lithium is 3 and its mass number is 7, how many protons, electrons, and neutrons does a neutral
atom of Li have
Answer:
Protons = 3
Neutrons = 4
Electrons = 3
Explanation:
For every atom, the atomic number is equal to the number of protons.
In a neutral atom (atom with no charge) the number of protons is equal to the number of electrons.
To calculate neutrons subtract the number of protons (atomic number) from the rounded molar mass:
7 - 3 = 4 neutrons
Convert 35 joules into calories.
OR 1.410 cal
OC 82,500 cal
OD. 1.420,000 cal
Answer:
0.83Cal
Explanation:
Given parameters:
Amount of energy given;
35J;
Convert to Cal;
1 calorie = 42 joules
x calories = 35 joules
Cross multiply;
42x = 35
x = [tex]\frac{35}{42}[/tex] = 0.83Cal
What is the K-T boundary?
Answer:
Definition
The Cretaceous/Tertiary boundary (KT), also often called the Cretaceous/Paleogene (K/Pg) boundary, marks the contact between the Mesozoic and Cenozoic eras ∼ 65 Ma ago. The KT boundary is characterized by the last major mass extinction in Earth history that saw the demise of the non-avian dinosaurs along with 50% to 60% of the Earth fauna and flora.
State the career function of mechanical engineering
Answer:
Mechanical engineers design power producing machines, like electric generators, internal combustion engines, and steam and gas turbines, also power using machines, such as refrigeration and air-conditioning systems. Mechanical engineers design other machines inside buildings, such as elevators and escalators.
Explanation:
What evidence always shows that a chemical change has happened?
O A. The total mass of material changes.
O B. A new substance is produced.
C. A solid material dissolves in a liquid.
O D. A liquid changes into a solid.
Answer:
B. A new substance is produced.
Explanation:
In chemical changes, you will always have a new end product from the reactants that were used within the process.
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Deforestation would most directly result in which of the following?
A. The disappearance of native species.
B. Industrialization of an area.
C. The depletion of the ozone layer.
D. Global warming.