Liquid atoms are more energetic than those in a solid. The melting point of each substance is a specified temperature. When anything gets hot enough to melt it, a solid can change into a liquid.
What does melting point mean?The melting point of a pure substance is the temperature at which its solid and liquid states can coexist in equilibrium.
In the liquid state, atoms or molecules have enough kinetic energy to travel independently of one another and the chemical bonds connecting them to the crystal lattice, but not enough energy to completely split from other atoms.
Atoms in a liquid have more energy than those in a solid. Each substance has a specific temperature at which it will melt. A solid can turn into a liquid when anything becomes hot enough to melt it.
Therefore, liquid are more energetic in liquids than in solids.
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if an elements atomic mass is 70 and it has 39 neutrons how many protobs does it have? What element is this?
The element has 31 protons based on the given information, but its specific identity cannot be determined.
Explanation:The number of protons in an atom is determined by its atomic number. In this case, the element has 39 neutrons and a total atomic mass of 70. To find the number of protons, we subtract the number of neutrons from the atomic mass. So, the element has 31 protons.
The atomic number of an element determines its identity on the periodic table. However, with only the number of neutrons and the atomic mass given, it is impossible to determine the exact identity of the element. More information is needed to identify the element.
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Elements in the same group of the periodic table typically have ________.
The molar mass of iron oxide (Fe2O3) is 159.7 g/mol. What is the correct way to write the molar mass of iron oxide as a conversion factor?
the answer is C 159.7g Fe2O3/1 mol Fe2 O3
When writing the conversion factor for the molar mass of Fe2O3, it will be written as:
159.7 g Fe2O3 / 1 mol What is the conversion factor of iron oxide (Fe2O3) whose molar mass is 159.7 g/mol?The molar mass of a substance is the mass of one mole of that substance.
The molar mass of of iron oxide (Fe2O3) is 159.7 g/mol.
This means that 1 mole of iron oxide (Fe2O3) has a mass of 159.7 g.
Therefore, in writing the conversion factor, it will be written as:
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The visible part of the electromagnetic spectrum consists of the colors that we see in a rainbow. Different colors correspond to different wavelengths of light. Which color of visible light has the longest wavelength?A.Violet B.Red C.Green D.Yellow
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, red color of visible light has the longest wavelength. The correct option is option B.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.
There is a relation between frequency of wave, and wavelength of wave
Mathematically,
ν =c÷λ
where,
ν =frequency of light
c is speed of light
λ is the wavelength of light
Red color of visible light has the longest wavelength.
Therefore, red color of visible light has the longest wavelength. The correct option is option B.
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a hockey player has the puck in the corner of the rink. an opposing player muscles him aside and emerges with the puck. this situation is most analogous to which kind of reaction?
Answer: Single displacement
Explanation:
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.
A general single displacement reaction can be represented as :
[tex]A+BC\rightarrow AC+B[/tex]
Thus if A is more reactive than b, then A can displace B from its position and can combine with C to give AC and B.
Given:A hockey player has the puck in the corner of the rink. An opposing player muscles him aside and emerges with the puck. Thus it is similar to single displacement reaction.
What is the mass number of an ion with 109 electrons, 157 neutrons, and a +1 charge?
The atomic nucleus does not contain ____________, which are negatively charged subatomic particles.
The atomic nucleus does not contain electrons, which are the negatively charged subatomic particles that orbit the nucleus. Protons and neutrons, carrying positive and no charge respectively, are the ones that make up the nucleus.
The atomic nucleus does not contain electrons, which are negatively charged subatomic particles. The nucleus is a positively charged region consisting of protons, which have a positive electric charge, and neutrons, which are neutral. Electrons are instead located outside the nucleus, moving through the mostly empty space that makes up the rest of the atom. These subatomic particles—protons, neutrons, and electrons—are bound by forces that define the structure of the atom. The arrangement of these particles explains why the nucleus itself carries a net positive charge, balanced by the negative charge of the electrons that orbit around it.
Water molecules are __________.
a. composed of atoms joined by stable polar covalent bonds
b. attracted to each other because of their polar nature
c. capable of interacting with ions and polar molecules because of water being a polar molecule
d. all of the above are true
What is the relationship between mass and volume of a substance
Which compound is a carbohydrate?
A) sugar
B) water
C) olive oil
D) amino acid
Why does a solid turn into a liquid when heat is added?
Although the nucleus of an atom is very important, it is the ___ of the atom that determine its chemical properties
It's the electrons of an atom that determine its chemical properties. Electrons participate in chemical reactions—and it's these electron interactions that govern the atom's chemistry. For instance, chlorine's reactions stem from its desire to gain an extra electron.
Explanation:Although the nucleus of an atom is indeed very important, it is the electrons of the atom that ultimately determine its chemical properties. This is because electrons involve in the chemical reactions.
In order for any chemical reaction to occur, there must be a movement, exchange or sharing of the electrons between two or more atoms. It's these electron interactions that govern the chemistry of the atom, hence determining its chemical properties.
For example, chlorine (Cl) has 7 electrons in its outermost shell and would prefer to gain an additional electron to achieve a complete outer shell. This electron 'hunger' is what fuels chlorine's reactions with other elements and compounds, thus determining its chemical properties.
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Which of the following can be natural sources of water pollution?
a.
volcanic activity
b.
earthquakes
c.
algae blooms
d.
all of the above
The natural sources of water pollution are algae blooms. Therefore, option C is correct.
What is water pollution ?Water contamination is the tainting of bodies of water, typically as a result of human activity, which has a detrimental impact on their uses. Aquifers, reservoirs, lakes, rivers, seas, and groundwater are all examples of bodies of water. When contaminants are introduced into these water bodies, water contamination results.
The main causes of water pollution are bacteria, viruses, parasites, insecticides, pharmaceuticals, plastics, feces, radioactive materials, fertilizers, and pesticides. These compounds are frequently invisible contaminants, since they do not always alter the color of the water.
The Industrial Revolution of the middle of the 19th century brought forth remarkable technological advancements, as well as new sources of air and water pollution. The repercussions of these developments started to be seen over the world by the middle of the 20th century.
Thus, option C is correct.
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Answer:
Algae Blooms
Explanation:
(691)*(787100) rounded to the correct number of significant figures
Is the dissolving of copper (ii) chloride in water a chemical change or a physical change why?
Which of the following will occur soon after a population of prey increases slightly in size?
A) Predator population will remain the same.
B) Predator population will decrease greatly.
C) Predator population will decrease slightly.
D) Predator population will increase greatly.
E) Predator population will increase slightly.
Answer:
The Answer is E
Explanation:
Got it right on the test.
Based on the chemical bonds present in this molecule, we would classify it as a(n)
A) Simple Sugar
B) Saturated Fat
C) Unsaturated Fat
D) Complex Carbohydrate
Answer is C – Unsaturated fat.
Fats are large molecules basically made from a combination of glycerol and three chains of fatty acids. Usually fats consist of C, H and O. According to the C – C bond, there are two types of fats as saturated fats and unsaturated fats. Saturated fats have only C – C single bonds and all C atoms are sp³ hybridized atoms. But in unsaturated fats other than C – C single bonds there are C – C double bonds. Hence, both sp³ and sp² hybridized C atoms can be seen.
Select the compound that is not organic.
1. Sucrose
2. Methane
3. Urea
4. Sodium Chloride
Answer:
Sodium chloride.
Explanation:
The organic compounds are compounds of carbon. They may have some other atoms like hydrogen, oxygen, sulfur, nitrogen, halogens etc. However the skeleton is of carbon only.
The simplest organic compound is methane (which is a hydrocarbon).
Sucrose is a disaccharide of glucose and fructose. It is an organic compound.
Urea is NH₂CONH₂, again an organic compound.
While Sodium chloride is NaCl, which has no carbon and it is an ionic inorganic compound.
what is the mass of a 5.50 cm3 cylinder of a substance that has a density of 4.20 g/cm3
Use the periodic table entry below to answer the following question.
What is the atomic mass of the element cobalt (Co)?
27
31
59
31.71
Sort these elements into pairs that would most likely exhibit similar chemical properties Br ,Mg ,F ,Sr ,S ,O
Final answer:
Similar chemical properties in elements arise from their groupings in the periodic table. Bromine and Fluorine are paired as halogens; Magnesium and Strontium as alkaline earth metals; and Sulfur and Oxygen as chalcogens.
Explanation:
Elements that exhibit similar chemical properties are often found in the same group or family on the periodic table. The elements provided can be sorted into pairs based on their chemical behaviors and position in the periodic table:
Bromine (Br) and Fluorine (F): Both are halogens found in Group VII, known for their reactivity and tendency to form compounds by gaining one electron.Magnesium (Mg) and Strontium (Sr): These are alkaline earth metals found in Group II, which are shiny and good conductors of heat and electricity, with each forming compounds with oxygen in a ratio of one of their atoms to one oxygen atom.Sulfur (S) and Oxygen (O): Both belong to Group VI (the chalcogens) and can form compounds by gaining two electrons.In summary, similar properties in elements are a result of their position within the same group on the periodic table. For example, bromine and fluorine are both halogens, while magnesium and strontium are alkaline earth metals.
During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a high-energy compound, from simpler substances. What energy transformation occurs during this process?
Answer: radiant energy to chemical energy
Explanation:-
Radiant energy is the energy of electromagnetic waves.
Chemical energy is the energy stored in the bonds of molecules.
Photosynthesis is a phenomenon in which green plants containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water to form glucose and oxygen.
Photosynthesis is the process used by plants, algae and certain bacteria to convert energy from sunlight called as radiant energy and turn it into chemical energy in the form of glucose which is used as a source of energy by many organisms.
[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]
Propane (C3H8), a fuel that is used in camp stoves, produces carbon dioxide (CO2) and water vapor (H2O) on combustion as follows. Mc032-1. Given that the molar mass of H2O is 18.02 g/mol, how many liters of propane are required at stp to produce 75g of H2O from this reaction
Answer : The volume of propane required are, 23.29 L
Solution : Given,
Mass of water = 75 g
Molar mass of water = 18 g/mole
First we have to calculate the moles of water.
[tex]\text{Moles of water}=\frac{\text{Mass of water}}{\text{Molar mass of water}}=\frac{75g}{18g/mole}=4.16moles[/tex]
Now we have to calculate the moles of propane.
The balanced chemical reaction will be,
[tex]C_3H_8+5O_2\rightarrow 4H_2O+3CO_2[/tex]
From the reaction, we conclude that
As, 4 moles of water produces from 1 mole of propane
So, 4.16 moles of water produces from [tex]\frac{4.16}{4}=1.04[/tex] mole of propane
Now we have to calculate the volume of propane.
As, 1 mole of propane contains 22.4 L volume of propane gas
So, 1.04 mole of propane contains [tex]22.4L\times 1.04=23.29L[/tex] volume of propane gas
Therefore, the volume of propane required are, 23.29 L
Is ethyl alcohol a heterogeneous or homogeneous mixture?
What is the correct name for the molecular compound n2s4?
The correct name for the molecular compound with chemical formula N₂S₄ is dinitrogen tetrasulfide.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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Why are the amounts of products formed in a reaction determined only by the amount of limiting reactant?
The amount of product formed in a reaction is determined by the limiting reactant.
Explanation:The amount of product formed in a reaction is determined by the limiting reactant. The limiting reactant is the reactant that is completely consumed in a reaction, thus limiting the amount of product that can be formed. Let's say we have a reaction between hydrogen gas and oxygen gas to form water. If we have 4 moles of hydrogen and 2 moles of oxygen, the balanced chemical equation tells us that we need 2 moles of hydrogen for every 1 mole of oxygen. Since we have only 2 moles of oxygen, it will be completely consumed and we will only be able to form 4 moles of water, even though we have excess hydrogen.
an unknown substance undergoes a chemical chance that gives off heat. which of the following is true
The correct statement for a chemical change that gives off heat is that the molecule types change and the process is exothermic, as energy is released to the surroundings.
When an unknown substance undergoes a chemical change that gives off heat, the process is exothermic, and the types of molecules before and after the change are different. A chemical change that releases heat indicates that energy is a product of the reaction.
This is contrasted with an endothermic process where heat is absorbed, and the surroundings become colder. In exothermic reactions, bonds are formed which release more energy than the energy needed to break bonds in the reactants, hence the heat given off to the surroundings.
The correct statement for a chemical change that produces heat is: The types of molecules of the substance before and after the chemical change are different, and the change was exothermic.
Complete Question - An unknown substance undergoes a chemical change that gives off heat. Which statement is true?
The types of molecules of the substance before and after the chemical change are different, and the change was endothermic. The types of molecules of the substance before and after the chemical change are the same, and the change was exothermic. The types of molecules of the substance before and after the chemical change are the same, and the change was endothermic. The types of molecules of the substance before and after the chemical change are different, and the change was exothermic.Prepare approximately .1n hcl by putting the correct amount of concentrated acid in a glass bottle and
How is chemical sedimentary rock different from detrital sedimentary rock?
Chemical sedimentary rock and detrital sedimentary rock differ in terms of their formation and composition.
Explanation:Chemical sedimentary rock and detrital sedimentary rock are different in terms of how they form and their composition. Chemical sedimentary rocks are formed when dissolved minerals in water precipitate and solidify. Examples of chemical sedimentary rocks include limestone and rock salt. On the other hand, detrital sedimentary rocks are formed from the accumulation and lithification of fragments of other rocks. Examples of detrital sedimentary rocks include sandstone and shale.
The highest elevation Mt. Zembat in Alaska 40 years ago was measured at 7600 feet. Today the highest elevation is 7598 feet. What is the rate of change in elevation for this mountain?
The rate of change in elevation for Mount Zembat in Alaska is 0.05 feet per year, calculated by dividing the total change in elevation, 2 feet, over the 40-year period.
Explanation:To calculate the rate of change in elevation for Mount Zembat in Alaska, we take the difference in elevation over the time period and divide it by the number of years. Forty years ago, the mountain was measured at 7600 feet, and today it is measured at 7598 feet. Therefore, the elevation has decreased by 2 feet over 40 years.
The rate of change per year is calculated as follows:
Rate of change = (Initial elevation - Current elevation) / Time
Rate of change = (7600 feet - 7598 feet) / 40 years
Rate of change = 2 feet / 40 years
Rate of change = 0.05 feet per year
So, the rate of change in elevation for Mount Zembat is 0.05 feet per year.