Explain the saying, “Rome was not built in a day
Answer:
What is the Rome was not built in one day with speech
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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Which of these ions has the correct charge?
O2-
B2+
P2-
Li2+
Answer:
B2
Explanation:
"+" contains positivity
Lily replicates an experiment that found that the number of calories in a particular food is 50 kcal. She obtained data from five trials: 50 kcal, 72 kcal, 50 kcal, 12 kcal, and 50 kcal.
Which best describes her data results?
accurate
incorrect
invalid
precise
PLEASE HURRY IM TIMED
Answer:
the best that describes her data result is precise
what is the physical state of the fuel in a lighter?why happens if you press the lighter in order to let the fuel to flow out
Answer:
It is a liquid gas
Explanation:
The spark of the lighter starts the fire which is exposed to the liquid gas in the lighter
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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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.
The amplitude of a transversal wave in a spring toy triples. What happens to the energy of the wave in the
toy?
Answer: The energy of the wave increases by a factor of 9
Explanation:
3 x 3 = 9
increased amounta of carbon dioxide in Earth's atmosphere may lead to global warming. what might global warming then lead to
air temperatures increasing.
How are solutions classified? Give an example of each.
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
The B-group elements of the periodic table do not include: 1) metals. 2) Non-metals. 3) D. Elements
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.
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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.
How many moles are there in 12.5 g of methanol, CH3OH?
A) 0.0326 mol
B) 0.39 mol
C) 69.0 mol
D) 30.7 mol
Answer:
B (0.39 mol).
Explanation:
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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.
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
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
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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Given the following equation,
HCl aq) + NaOH aq
NaClaq) + H2O(l)
How many moles of H20 will be produced if there are 5 moles of HCI?
Answer:
5 moles
Explanation:
Given data:
Number of moles of HCl = 5 mol
Number of moles of H₂O produced = ?
Solution:
Chemical equation:
HCl + NaOH → NaCl + H₂O
Now we will compare the moles of HCl with H₂O.
HCl : H₂O
1 : 1
5 : 5
5 moles of water will be produced.
Liquid nitrogen, which has a boiling point of −195.79°C, is used as a coolant and as a preservative for biological tissues. Is the entropy of nitrogen higher or lower at −200°C than at −190°C? Explain your answer. Liquid nitrogen freezes to a white solid at −210.00°C, with an enthalpy of fusion of 0.71 kJ/mol. What is its entropy of fusion? Is freezing biological tissue in liquid nitrogen an example of a reversible process or an irreversible process?
Answer:
Explanation:
Entropy is measure of disorder so as we lower the temperature of gas , its entropy decreases .
Hence at - 200°C entropy of nitrogen will be less than that at - 190°C .
At freezing point ,
entropy of fusion = latent heat / freezing temperature
= .71 kJ / ( 273 - 210 )
= 710 / 63 J mol⁻¹ K⁻¹ .
= 11.27 J mol⁻¹ K⁻¹ .
entropy of fusion = 11.27 J mol⁻¹ K⁻¹ .
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".
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
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:
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.
what is a factor of matter
Explanation:
The factor of matter are solubility, boiling point, melting point, temperature, density and reactivity
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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Step 3: Explain your prediction.
a) Create a new blank document. Type your name at the top.
b) Write a few paragraphs predicting the products of the chemical reaction and explaining why you
made this prediction. Your document should:
i. identify the products of the chemical reaction.
ii. explain why these are the products based on trends in the periodic table (the number of
valence electrons, electronegativity, etc.).
iii. identify the types of bonds in the reactants and products.
iv. identify the number of each type of bond in the reactants and products.
v. identify the type of reaction.
c) Label these paragraphs “Initial Explanation.”
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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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.