Answer:
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction.
For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
Another example, solar panels don't create solar energy. They harness energy from the sun and transform it into another type of energy (electricity).
The Periodic table below shows major regions in different colors. In this periodic table, which type of element is shown in green boxes?
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The Correct choice is~ B
The elements shown in green boxes are ~ Metalloids
How many total bonds (Total shared pairs) are in the lewis structure for HSiN and CO2?
Answer:
2
Explanation:
Hope it can help you lovelots
#LEARN WITH BRAINLY
Which bond is the strongest? A) H–Br C) H–F B) H–Cl D) H–I
Limestone is used in industry as a raw material in the production of slaked Ca (OH) 2.
1) Write the equations of the chemical reactions that characterize the transformations carried out in the production process!
CaCO3 -> CaO -> Ca (OH) 2
The first reaction equation is how calcium oxide can be obtained from calcium carbonate.
The second reaction equation - how calcium oxide can be obtained from calcium oxide.
Answer:
i k ow its not the exact anwser but ih ope this helps
Explanation:
Energy plays a key role in chemical processes. According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds. Energy is absorbed to break bonds, and energy is evolved as bonds are made. In some reactions the energy required to break bonds is larger than the energy evolved on making new bonds, and the net result is the absorption of energy. Such a reaction is said to be endothermic if the energy is in the form of heat. The opposite of endothermic is exothermic; in an exothermic reaction, energy as heat is evolved. The more general terms exoergic (energy evolved) and endoergic (energy required) are used when forms of energy other than heat are involved.
A great many common reactions are exothermic. The formation of compounds from the constituent elements is almost always exothermic. Formation of water from molecular hydrogen and oxygen and the formation of a metal oxide such as calcium oxide (CaO) from calcium metal and oxygen gas are examples. Among widely recognizable exothermic reactions is the combustion of fuels (such as the reaction of methane with oxygen mentioned previously).
(20 points) In the morning, you decide to make toasted bacon, lettuce, and tomato sandwich. Observe what happens in each stage of making the sandwich. Which parts involve only chemical changes happening?
I. The first thing you do is cut two slices of bread.
II. Then you put the slices in the toaster to cook. When the toaster is done, it pops the III. warm brown toast. You cook the bacon in a frying pan you put bacon, lettuce, and tomato on the bread, trimming the sides.
IV. You can smell the old bread in the garbage going moldy.
Steps I and II
Steps II and III
Steps II and IV
Steps III and IV
Answer:
C is the answer I did it and got it right
5. Which element would form
covalent bond with Oxygen (0)
Sodium (Na)
Calcium (Ca)
Aluminum (AI)
Selenium (Se)
An unknown hydrocarbon compound was analyzed for hydrogen by elemental analysis and results show that it contains 15.88 % H. What is the empirical formula
Answer:
C4H9
Explanation:
If H = 15.88%
Then C = 100.00 – 15.88 = 84.12
Divide each % value by respective atomic mass
H = 15.88/1 = 15.88
C = 84.12/12 = 7.01
Divide through by smaller value
H = 15.88/7.01 = 2.26
C = 7.01/7.01 = 1
Remove fraction , multiply by 4
H = 9
C = 4
Empirical formula = C4H9
The hydrocarbon could be ( C4H9)2 = C8H18 = octane.
Using this chemical stoichiometry, determine the number of moles of carbonic acid that can be produced from 2 mol NaHCO3 and 7 mol HCl.
Answer:
reaction is NaHCO3 + HCL = H2CO3 + NaCl
the ratios are 1:1
the 8 moles of HCl are in excess
so if you use 4 moles of NaHCO3 then you will obtain 4 moles of carbonic acid
hope that helps
Explanation:
Assume that the heat lost by the surface is gained by ethyl chloride. What enthalpies must you consider if you were to calculate the final temperature of the surface
Answer:
Specific heat of ethyl chloride in gas and liquid phases, enthalpy of vaporization and specific heat of solid surface.
Explanation:
In order to determine the final temperature, the heat lost by the chloride needs to be found. This would require the specific heat in both phases and the enthalpy of vaporization. (you will use q=mc(delta)T and q=m(delta)H)
Then the energy gained by the surface needs to be found. This will require the specific heat in order to use the q=mc(delta)T equation.
The enthalpies that we consider to calculate the final temperature of the surface are Specific heat of surface and ethyl chloride as well as Heat of vaporization of liquid & vapor ethyl chloride.
What is enthalpy?Enthalpy of any reaction tells about the total amount of heat absrobed and released during a chemical reaction.
According to the question, heat released by the surface is absorbed by the ethyl chloride and by absorbing this energy ethyl chlorode will change into the vapor form. In the whole process if we want ot calculate the final temperature on the surface then we should consider:
Specific heat of surface.Specific heat of ethyl chloride.Heat of vaporization of liquid ethyl chloride.Heat of vaporization of vapor ethyl chlorideHence, required enthalpies are Specific heat of surface and ethyl chloride as well as Heat of vaporization of liquid & vapor ethyl chloride.
To know more about enthalpies, visit the below link:
https://brainly.com/question/11628413
Which of the following represents alpha decay?
O A. 169 Gd 108TB +_9e
B. 159 Eu + je → 189 Sm
150
-
C. 90T = 9T +
→ 43
O D. GO → 1945m + He
148
There are two modes in which unstable nuclei of radioactive elements may decay. They are by α - emission or by β - emission. Among the given options, the α - emission is ₆₄¹⁴⁸Gd → ₆₂¹⁴⁴Sm + ₂⁴He. The correct option is D.
What is α - decay?According to the theory of radioactive disintegration, the atoms of all the radioactive elements undergo spontaneous disintegration with the emission of α or β particles to yield atoms of new elements. When a radionuclide decays by emitting an α - particle, it is called α - decay.
When a radionuclide undergoes α - emission, i.e. a helium nucleus there occurs a decrease of 2 units in the atomic number and a decrease of 4 units in the mass number. The new nuclide produced has an atomic number 2 units less and a mass number 4 units less than the parent.
₆₄¹⁴⁸Gd → ₆₂¹⁴⁴Sm + ₂⁴He represents α - emission.
Thus the correct option is D.
To know more about α - emission, visit;
https://brainly.com/question/14921881
#SPJ7
Describe two or three ways in which the measurements you made could lead to errors in the results. Explain how each error would affect the answer of molar mass. In other words, would the molar mass go up or down and why
Answer:Physical and chemical laboratory experiments include three primary sources of error: systematic error, random error and human error
Explanation:
When examining the root mean square speed equation, we can see that the changes in temperature (T) and molar mass (M) affect the speed of the gas molecules. The speed of the molecules in a gas is proportional to the temperature and is inversely proportional to molar mass of the gas.
What is measurement??
0000000000
measurement is the process of finding the value of any Unknown physical quantities in standard value.
Mark me as a brainlist
Measurement has been defined as the concept widely used in math and science to quantify an object. It is used to denote the quantification of the event or the object with respect to other or individually.
Hence, the definition of measurement is the process of determining the size or smallness of a physical amount by comparing it to a reference quantity of the same kind as the object.
It has been used to determine the quantity to be small or large based on some predetermined standard or values. It compares the physical quantity like mass can be estimated using kilograms or grams.
Learn more about measurement, here:
https://brainly.com/question/2107310
#SPJ7
SIGNIFICANT FIGURES ARE FIGURES WITH
Answer:
All zeros between other significant digits are significant. The number of significant figures is determined by starting with the leftmost non-zero digit. The leftmost non-zero digit is sometimes called the most significant digit or the most significant figure. For example, in the number 0.004205, the '4' is the most significant figure.
Explanation:
PA BRAINLIEST
HOPE ITS HELP
GOD BLESS
Explain how signals are processed and stored by the brain.
[tex] \: \: \: \: [/tex]
Neurons communicate with each other by sending chemical and electrical signals. Each neuron is connected with other neurons across tiny junctions called “synapses”. Impulses rush along tiny fibres, like electrical wires, from one neuron to the next. Electrical impulses travel through neuronshope it helps[tex] \: \: \: \: \: \: \: [/tex]
how many grams of H20 can be formed from 0.996 g C8 H18?
leopard has canine teeth because
Explanation:
Leopards have 32 teeth, 4 of which are long, pointed canine teeth. Canine teeth are used to kill prey. Other teeth are for cutting flesh and grinding bone
polar ? polar? polar? which is polar?
Answer:
HBr
Explanation:
HBr (Hydrogen Bromide) is a polar molecule because of the unequal electronegativities of Hydrogen and Bromine atoms. Bromine has a higher electronegativity than hydrogen due to which electron bonded pair gets attracted slightly more towards bromine atom making HBr a polar molecule and resulting in a net dipole moment.
5. To investigate electrostatic forces between molecules in water and in ethanol, a student pours identical amounts of the liquids into two identical beakers. The student then places objects of different weights in the beakers. Which characteristic is the student most likely testing?
A. melting point
B. boiling point
C. surface tension
D. vapor pressure
The student then places objects of different weights in the beakers, surface tension is the characteristic is the student most likely testing.
What is surface tension ?Surface tension is the propensity for liquid surfaces that are at rest to condense into the smallest surface area. Razor blades and insects, which have a density greater than that of water, can float on the surface of the water without even becoming partially buried because of surface tension.
A liquid surface's ability to operate like a stretched elastic membrane is known as surface tension. Small liquid drops and soap bubbles have almost spherical shapes, which are indicators of these phenomena. Some insects can stand on the surface of water due to this characteristic.
Surface tension is a crucial factor in many industrial processes, such as detergent formulation, paint optimization, improved oil recovery, medicinal compound performance, and food product stability.
Thus, option C is correct.
To learn more about surface tension, follow the link;
https://brainly.com/question/11348644
#SPJ2
how much heat is required to melt 3.15 mol of solid acetate acid
How large
would be needed to hold
a Container
of water
Answer:
Since water has a density of 1 gram per cubic centimeter, then the container would need to be 800 cubic centimeters. if this container were a perfect cube, then the length of the side of the container would be equal to the cube-root of 800, which is approximately 9.28 cm to a side, or 3.65 inches to aside.
Its DUE TODAY AT 6:00PM!!!!!!!!
Would you expect the reaction of phosphoenolpyruvate to pyruvate to be a reversible reaction?
Answer:
i) In thee mitochondrion, pyruvate carboxylase converts pyruvate to oxloacetate.
ii) Malate dehydrogenase in the mitochondrion reduces oxaloacete to to malate.
iii) Malate dehydrogenase in the cytoplasm oxidizes malate to oxaloacetate.
iv) Phosphoenolpyruvate carboxykinase decarboxylates and phosphorylates oxaloacetate.forming phosphoenolpyruvate.
Explanation:
Gluconeogenesis is the synthesis of glucose from non - carbohydrate compounds. The substrates for gluconeogenesis are lactate, pyruvate, amino acids, propionate and glycerol.
Gluconeogenesis occurs only in cytosol but the precursor is produced in mitochondria. In the conversion of pyruvte to phosphoenolpyruvate occur in mitochondria and cytosol.
Step -1:
Pyruvate carboxylase is a biotin dependent enzyme located in mitochondria. It converts pyruvate to oxlaoacetate and carbondioxide in the presence of ATP.Oxlaocetate synthesized in mitochondrial matrix has to be transported to cytosol for gluconeogenesis. Oxaloacetate is impermeble, cannot be sent out of mitochondria. So it has to be converted to malate.
Step -2:
Malate dehydrogenase in mitochondria converts oxaloacetate synthesized in mitochondrial matrix to malate. And then it is transported to cytosol.
Step 3:
Malate dehydrogenase responsible for reversible reaction in cytosol converts malate to oxaloacetate.
Step -4
Phosphoenolpyruvate carboxy-kinase in cytosol converts oxaloacetate to PEP. The enzyme transfer high energy phosphate bond from GTP to oxaloacetate to from PEP and liberated carbondioxide.
Therefore, the steps of glycolysis converts phosphoenolpyruvate to pyruvate are as follows.
i) In thee mitochondrion, pyruvate carboxylase converts pyruvate to oxloacetate.
ii) Malate dehydrogenase in the mitochondrion reduces oxaloacete to to malate.
iii) Malate dehydrogenase in the cytoplasm oxidizes malate to oxaloacetate.
iv) Phosphoenolpyruvate carboxykinase decarboxylates and phosphorylates oxaloacetate.forming phosphoenolpyruvate.
Explanation:
Nancy rides her bike 114.8 miles in 8.2 hours. What is her average speed in miles per hour
The answer to the question is 14 no cap
Compare and contrast thermal energy and heat
Explanation:
The difference between heat and thermal energy is that thermal energy is not in the process of being transferred; it is not in transit, but remains as part of the internal energy of the system; heat, on the other hand, is energy in transit, i.e. energy in the process of being transferred from a hotter system.
aufbau principle
what is the meaning of the principle
Answer:
The meaning of this principle is building-up.
Explanation:
The Aufbau principle asserts that electrons occupy lower-energy atomic orbitals before filling higher-energy ones (Aufbau is German for "building-up") (Aufbau is German for "building-up"). By using this method, we may forecast the electron configurations for atoms or ions.
How many moles of O₂ would be required to generate 13.0 mol of NO₂ in the reaction below assuming the reaction has only 80.0% yield?
Answer:
Chemical reaction:
2 NO (g) + O₂ (g) → 2 NO₂ (g)2 moles of NO₂ is produced from O₂ moles = 1
Therefore, 2 moles of NO₂ is produced from O₂ moles = [tex]\dfrac{1}{2} \times 13 = \bf{6.5 mol}[/tex]
For 80 % yield no. of moles of O₂ = 6.5 mol
Then for 100% yield no. of moles of O₂ =[tex] \dfrac{6.5}{80\%} =\dfrac{6.5}{\frac{80}{100}} =\dfrac{6.5}{80} \times 100 = \dfrac{650}{80} = \bf 8.125\;mol [/tex]
Help with this please :) will mark Brainlyist if right
Answer:
3
Explanation:
What is the wavelength of a photon that will be emitted when an electron in the hydrogen atom moves from n
Answer:
Use the Rydberg Equation 1/λ = R(1/n²(final) - 1/n²(initial) where R = 109,678 cm⁻¹. Substitute initial orbital number and final orbital number and solve for wavelength (λ).
Explanation:
Example:
Assume an electron transition from n = 5 to n = 2.
1/λ = 109,678cm⁻¹(1/2² - 1/5²) = 109,678(0.25 - 0.04)cm⁻¹ = 23,032cm⁻¹
λ = 1/23,032cm⁻¹ = 4.34 x 10⁻⁵cm x 10⁻²m/cm x 10⁹nm/m = 434nm
What other inventions came because of the microscope? (These are inventions that are related to the microscope in some way.)
Answer:
Explanation:Leeuwenhoek observed animal and plant tissue, human sperm and blood cells, minerals, fossils, and many other things that had never been seen before on a microscopic scale. He presented his findings to the Royal Society in London, where Robert Hooke was also making remarkable discoveries with a microscope.
Which of the following does NOT involve a physical change?
Answer:
Degradation of matter
Explanation:
Physical change is a temporary change.
please help me
Select the correct answer.
Who founded the specialized field of anatomy?
A. Herophilus
B. Aristotle
C. Claudius Galen
D. William Harvey
Answer:
the correct answer is A. please mark me brainlist
Explanation:
Answer:
geon, Andreas Vesalius. Vesalius describes what he observes during the public dissection of human corpses. By dissecting human bodies, preparing muscles, tendons, and nerves down to the smallest detail, Vesalius is able to prove more than 200 errors in Galen’s anatomical works.
Explanation:
With his comprehensive scientific studies of human bodies, the young professor of medicine not only revolutionizes anatomy, but consequently, the whole science of medicine.
I know I never completely answered your question, I just wanted to explain it was E. None of the above.