Answer:
The total number of atoms in this chemical formula
C8H3 NaBr 12
8+3+1+12=24
When solid sodium hydroxide is dissolved in water,the temperature of the soution formed rapidly increases. a) compare the total energy of the solid NaOH with that of the solution and state which is greater.
Answer: In a perfectly isolated system, the total energy is the same.
Explanation: The conservation laws for mass and energy hold in a system that is isolated from its surroundings. The enegy released by the dissolution of solid NaOH in water is absorbed by the water. So the total energy of the syetm remains the same. It is simply converted from lattice energy of the NaOH into heat energy as measured by the temperature of the water. As long as it is operfectly isolated, the total energy remains the same.
Which pair of diseases could both be treated effectively with antibiotics
A. athletes foot and flu
B. cholera and salmonella
C. flu and scurvy
D. malaria and rickets
Imma mark the correct answer brainliest
Answer:
cholera and salmonella
Explanation:
i believe so
QUESTION 5
A. Aluminum carbonate
(03.04 LC)
Match the formula to the correct name.
Al2O3
e Al(HCO3)3
Al2(CO3)3
B. Aluminum oxide
C. Aluminum bicarbonate
QUESTION A
The chemical formula of aluminium carbonate is written as Al2(CO3)3.
The chemical formula of a compound is a representation of the atoms that compose the compound. Usually, the chemical formula is derived from the name of the compound.
We know that the carbonate ion is CO3^2- while the aluminium ion is Al^3+. It follows that the compound, aluminium carbonate ought to have the formula, Al2(CO3)3. The compound aluminum oxide has the formula Al2O3 while the compound aluminum bicarbonate has the formula Al(HCO3)3.
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Aeration basins increase the rate of bacteria working to break down the organic matter in wastewater. True or False?
Answer:
it is true
Explanation:
Aeration basins increase the rate of bacteria working to break down the organic matter in wastewater is true.
What is aeration basins?Aeration basins is defined as the biomass consumes both oxygen and organic pollution, resulting in net microorganism growth and carbon dioxide release.
It can also be defined as the process of introducing air into wastewater in order to allow aerobic bio-degradation of pollutant components.
Aeration is frequently used to reduce the amount of carbon dioxide released by a treatment process.
It is the best methods for waste water treatment .
The main disadvantage of the aeration process is that too much oxygen is absorbed and the water becomes corrosive.
Thus, aeration basins increase the rate of bacteria working to break down the organic matter in wastewater is true.
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Theoretical yield of NaHCO3 = Na + H2O + CO + CO2
Answer:
C - 2 e- → C
Explanation:
2 NaHCO3 → 2 Na + H2O + -1 CO + 3 CO2
2 NaI + 2 e- → 2 Na0
C - 2e - C
If you have 460 grams of H2o, how many molecules are present?
Calculate the average atomic mass for the element beryllium, given this information about the
relative abundance of its 3 isotopes.
Be-8 = 0.2% Be-9 = 98.9% Be-10 = 0.9%. Please show all your work.
Answer: 9.007
Explanation:
Be-8 8 x 0.20% = 0.016
Be-9 9 x 98.90% = 8.901
Be-10 10 x 0.90% = 0.09
100.00% 9.007
Which quantity determines how two atoms bond? (1 point)
O the difference in the number of valence electrons
o their total number of valence electrons
o the sum of their electronegativities
O the difference in their electronegativities
The quantity which determines how two atoms bond is; The difference in their electronegativities.
The electronegativity value of an element is a measure of its electron affinity. In essence, the electronegativity value of an element determines if the element is an electron donor or acceptor.Ultimately, the difference between the electronegativities of two atoms determines how the atoms bond.
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Order the following phases of matter from the phase with the most space between the
atoms to the least space between the atoms.
Answer:
Gas>Liquid>Solid
Explanation:In a gas state, molecules are allowed to move freelyand rarely collide into nearby particles. In a liquid state, the molecules are contained within the liquid and occasionally bump into each other. now in a solid state the atoms arrange themselves into a structure that the atoms sit very tightly next to each other, sometimes vibarating
chemical properties of Carbon iv oxide
Explanation:
Carbon Dioxide is a colorless, odorless, incombustible gas resulting from the oxidation of carbon. Carbon dioxide appears as a colorless odorless gas at atmospheric temperatures and pressures. Heavier than air and may asphyxiate by the displacement of air.
Which two statements describe a mixture?
O A. It is a pure substance.
O B. It includes atoms of different elements.
O C. Its parts can be separated using physical means.
O D. It can result from chemical bonding.
Answer:
d
Explanation:
because the chemicals or substances mix together so it's basically like chemical bonding.
write the relation between group number and electronic configration
Answer:
Explanation: the number of circles in the electronic configuration of an element is represented in the periodic table as the period number that element is situated in. the number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in.
How is thermal energy transferred by convection, conduction, and radiation?
Answer:
Radiation is responsible for most of the heat transferred into the room. Heat transfer also occurs through conduction into the room, but at a much slower rate. Heat transfer by convection also occurs through cold air entering the room around windows and hot air leaving the room by rising up the chimney.
When a fluid, such as air or a liquid, is heated and then travels away from the source, it carries the thermal energy along. This type of heat transfer is called convection. The fluid above a hot surface expands, becomes less dense, and rises. ... A space heater is a classic convection example.
Determine whether each of the following reactions is spontaneous.
AHsystem = -75.9 kJ, T = 273 K,
ASsystem = 138 JIK
Answer:
gxibdkkzvsosvjzkxvdkbdsibsisbdkbslabdldvslbskskd
nono noonobbvyubojikkhbjhbjhb mj bk n
Why is the nitrogen group considered a mixed group?
Explanation:
The nitrogen group is considered mixed because it is composed of elements of equally different classifications of metal, non-metal, and metalloids. The group contains the nonmetals nitrogen (N), and phosphorus (P), the metalloids arsenic (As) and antimony (Sb), and the metals bismuth (Bi) and Moscovium (Mc).
In periodic table, metal, nonmetal and metalloids are mixed in group is know to be mixed group. Nitrogen group is mixed.
Define periodic table?
The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number. There are five parts in periodic table Component Groups, Ionic Bonds, element periods, and so forth, ionic bonds and Bonds made of metal.
The nitrogen group is said to be mixed because it is contains metal, nonmetal and metalloids. Elements can be classified into metal, non-metal, and metalloids. Nitrogen group mixed group contains the nonmetals nitrogen (N), and phosphorus (P), the metalloids arsenic (As) and antimony (Sb), and the metals bismuth (Bi).
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what is the colour change when universal indicator is added to apple juice
Answer:
red because its the flavor
Explanation:
Cell division resulting in two new nuclei having the same number of chromosomes as the
original nucleus is called
Cell division resulting in two new nuclei having the same number of chromosomes as the
original nucleus is called mitosis
What neutral element has 17 electrons an 18 neutrons?
Answer:
chlorine atom
A chlorine atom has 17 protons, 18 neutrons, and 17 electrons.
Explanation:
Answer:
chlorine atom
Explanation:
A chlorine atom has 17 protons, 18 neutrons, and 17 electrons.
What pressure is required to achieve a CO2 concentration of 0.0620 mol L−1 at 20∘C?
Considering the definition of ideal gas law, a pressure of 1.5 atm is required to achieve a CO₂ concentration of 0.0620 mol L⁻¹ at 20°C.
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P×V = n×R×T
So the pressure is calculated as:
[tex]P=\frac{n}{V}xRxT[/tex]
In this case, you know:
[tex]\frac{n}{V} = 0.0620 \frac{mol}{L}[/tex]R= 0.082 [tex]\frac{atmL}{molK}[/tex]T= 20 C= 293 KReplacing:
P=0.0620 [tex]\frac{mol}{L}[/tex]× 0.082 [tex]\frac{atmL}{molK}[/tex]× 293 K
Solving:
P= 1.489612 atm≅ 1.5 atm
Finally, a pressure of 1.5 atm is required to achieve a CO₂ concentration of 0.0620 mol L⁻¹ at 20°C.
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why should bunsen burners not be used when heating organic materials?
Answer:
Many organic compounds are very flammable.
Explanation:
Because we do not want to inadvertently ignite chemicals and cause a fire or explosion. Most organic chemicals are incompatible with inorganic chemicals, and certain mixtures can cause violent reactions.
complete and balance the equation pb3o4+hcl
ur so ok.
Explanation:
i need points ok.
thanks
Calculate the relative formula mass for KMnO4
Explanation:
please mark me as brainlest
Consider the molecule below. Determine the molecular geometry at each of the 2 labeled carbons. HELP ME PLEASE ASAP
C1 = trigonal planar, C2 = bent
B
C1 = trigonal planar, C2 = tetrahedral
C
C1 = bent, C2 = trigonal planar
D
C1 = tetrahedral, C2 = linear
The hybridization state of the atom determines its shape in the molecule. C1 is sp2 hybridized and has trigonal planar geometry while C2 is sp3 hybridized and has a tetrahedral geometry.
The shape of a molecule or a moiety in a molecule is determined by the number of electron pairs that are present on the valence shell of the central atom in the molecule.
The hybridization state of the atom also determines the shape of the atom. In the compound, the carbon atom labelled 1 is sp2 hybridized so it will have a trigonal planar geometry. The carbon atom labelled 2 is sp3 hybridized hence it is tetrahedral.
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nyatakan maksud bagi kation
lanuage ? lanuage ? lanuage ?
why are ionic solids brittle
Answer:
-The ionic solids are hard and brittle because the ions in ionic solids are held in a lattice due to the electrostatic forces of attraction in cations and anions as well as the repulsion with the like charges. ... Because the ionic solids are localized, these solids tend to be stiff and brittle like covalent solids.
Explanation:
differentiate between nuclear charge and effective nuclear charge
hope it helps ..............
A front is a boundary between two _________ ________. *
A. Bodies of land
B. Bodies of water
C. Air masses
D. Cloud sides
Answer:
C. Air massesExplaination :depending on the air masses involved and which way the fronts move, fronts can be either warm, cold, stationary, or occluded.
does iron and lead oxide react vigorously
Answer:
Fe will displace On but no the reaction is not vigorous.
Use the following image to answer the following questions. A student was performing an experiment using two identical cups made of styrofoam. The student had Cup A holding water at 90℃ and Cup B holding water at 20℃. The student then put an Aluminum Bar into each cup that was touching the water. As time passed, the student noticed that the temperature of the water in Cup A and Cup B began to change. Question:
A. Predict what will happen to the temperature of the water in Cup A and Cup B after 1 hour has passed. (1 point)
B. Explain and give evidence for what type of heat transfer is occurring between the 2 cups.
In cup A, the temperature of the water will drop after 1 hour and the temperature of the aluminium will rise. In cup B, there will be no change in temperature of the water and the aluminium. The type of heat transfer taking is conduction.
When two bodies at different temperatures come into contact which other. Heat is transferred from the hotter body to the cooler body until thermal equilibrium is achieved between the two bodies. The temperature of the water decreases while that of the aluminium bar rises.
The aluminium bars were put into the two cups holding water at 90℃ and 20℃ respectively. Since the water in cup A is at a higher temperature than the aluminium, heat is transferred from the water to the aluminium bar until thermal equilibrium is achieved.
In cup B, there is no temperature difference between the water and aluminum hence no heat transfer occurs. Note that a mode of heat transfer that depends on temperature difference between two bodies in contact is conduction.
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