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1 Which of the following is an example of periodicity?
a. eating breakfast
c. writing a letter b. hitting a home run d. sneezing
Answer:
A:UNDERSTANDING CONCEPTS PART A 13) Which of the following is an example of periodicity? A) eating breakfast
Two raw materials used in the manufacture of polythene
crude oil and natural gas
If a material is at. the particles in the material are not moving and do not have kinetic energy.
Answer:
Equilibrium
Explanation:
Definition: "A particle is in equilibrium provided it is at rest if originally at rest or has a constant velocity if originally in motion. Most often, static equilibrium is used to describe an object at rest"
The products of a neutralization reaction are ________ and ________ a salt.
Answer:
Neutralization reaction is a type of chemical reaction in which an acid and a base react together to form a salt and water as product.
Explanation:
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what are some examples of irreversibilities and reverse abilities for physical properties and chemical properties?
Answer:
physical properties are examples of irreversibilities
and chemical properties are example of reverse abilities.
why do atoms emit light energy according to the bohr model?
Answer: According to the Bohr model, atoms emit light because excited electrons are returning to lower energy states, emitting the energy difference. This energy always has a specific wavelength because the electrons can only exist in set orbits. ... An emission spectrum is the frequencies of light emitted from an atom.
Explanation:
Atoms emit light energy because electrons transit between energy levels by absorbing energy and relaxing by emission of radiation.
What is Bohr's model of atom?According to Bohr model of atom the electrons are revolving around the nucleus through the circular paths of fixed energies. These circular paths are called orbits.
Using this model the momentum and velocity of an electron and the atomic radius can be determined. Bohr, states the electrons are able to transit between these energy level and the energy difference between the two energy levels will be equal to the energy of a photo absorbed by the atom.
Electrons excite to higher energy level by by absorbing energy and they cant stay there for long while and relax back to the ground state by emitting a the radiation which is complementary wavelength to the absorbed one. That's why the atoms emit light.
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Sodium and chlorine react to form sodium chloride. If there are 1.4 moles of sodium used, how many moles of chlorine were required?
Answer:
0.7 moles of Chlorine gas is required.
Explanation:
The reaction is balanced as follows:
2Na + [tex]Cl_{2}[/tex] ------> 2NaCl
According to stoichiometry,
2 mole Sodium reacts with 1 mole Chlorine gas
∴1 mole Sodium reacts with 1/2 moles of Chlorine gas
∴1.4 mole sodium reacts with 1.4/2 moles of Chlorine gas
= 0.7 moles of Chlorine gas
So, 0.7 moles of Chlorine gas is required.
The height of a horse is traditionally measured in “hands” where a hand is 4.00 inches. What is the height of a horse, in meters, that is 14.0 hands tall?
56.75mL of 0.256 HI M reacts with 10.00mL sample of NaOH, what is the molarity of sodium hydroxide?
Answer: 1.45M
Explanation:
The definition of molarity is moles/liter. The neutralization of NaOH with HI is:
HI + NaOH = NaI + H2O
One mole of HI reacts with 1 mole of NaOH. We'll assume this is a titration reaction and that the 10.00ml sample of NaOH contains the same number of moles as the 56.75ml of 0.256M HI.
Moles HI: (0.256 moles/liter)*(0.05675 L) = 0.01453 moles HI
That means we muct have 0.01453 moles NaOH in 10.0ml of NaOH solution.
(0.01453 moles NaOH)/(0.010L) = 1.45 M
==
Another approach is to use the relationship M1V1 = M2V2, which is useful for titrations (M is concentration and V is volume):
We want M2, so rearrange: M2 = M1V1/V2
M2 = (0.256M)*(56.75ml)/(10.0ml)
M2 = 1.45M
Convert 2.68 mol H2O to molecules H2O
Timed test
What TWO changes of state occur when thermal energy is TAKEN AWAY FROM/DECREASED in a substance?
Answer:
i’m sorry i don’t know
Explanation:
Below is a diagram showing a metal being heated. What name is given to particle Y?
Enter your answer
Answer:
They're called free electrons.
The particle Y marked in the given diagram is electron and surrounding circles indicates metal atom or ions. Free electrons in metal lattice locates at the interstices of the crystal.
What are metals?Metals are electron rich elements exhibit higher thermal electrical conductivity. Metals are a pool of ions or electrons and therefore they form bonds with electronegative elements by donating electrons.
The interstitial sites of metal crystal lattice are occupied with free electrons and they can be transited to another sites or can be excited to get conductivity.
The electron transition from interstices provide the metal lattice some colors. The region from which an electron is transited is called F-center.
Therefore, the particle Y shown in the interstices of the metal lattice is electron.
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what is the charge of the cadmium cation
Answer:
In its compounds cadmium exhibits almost exclusively the +2 oxidation state, as in the colourless Cd2+ ion, which forms a number of stable complex ions, especially halide complexes.
Explanation:
Compare the type of change that occurs when a match is burnt and when a liquid starts boiling. Use complete sentences to justify the type of change that occurs. (10 points)
Answer: liquid boiling is a reversable chemical change.
Explanation: you can alter the temperature to prevent it from boiling
State and explain which measuring cylinder is the best to use?
Answer:
Graduated cylinder
Explanation:
A graduated cylinder is used routinely for measuring volume and is considered more accurate than a beaker because of the permanently-marked incremental graduations incorporated in the clear cylinder.
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Do you think the black moths would have increased population if the Industrial Revolution didn't occur? Explain your reasoning.
Answer:
The dark moths were now better camouflaged. As a result, dark moths had a greater chance of reproducing and passing on the alleles that made them dark. This led to a gradual increase in the proportion of dark moths until light moths became very rare in industrial areas. The moth populations in these areas had evolved.
The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.
A carbonated drink is a
a. mixture of gases and liquids.
b. heterogeneous mixture.
C. mixture of two immiscible liquids.
d. compound.
Help!
How can one separate and collect the solvent from a salt solution
Answer:
evaporate
Explanation:
after water or any other solvent has mixed with satt stirr the mixture then heat it the water will evaporate leaving the solute (salt) behind
11) What is the relationship between temperature and the speed of sound? Include the concept of molecule
vibration in your explanation.
Answer:
Temperature is another condition that affects the speed of sound. Heat, like sound, is a form of kinetic energy. Molecules at higher temperatures have more energy and can vibrate faster and allow sound waves to travel more quickly. The speed of sound at room temperature air is 346 meters per second.
H20 + C02...................
Answer:
NICE
Explanation:
TOES
Mention and discuss briefly the adverse effects of chemistry.
Depending on the chemical, these longer-term health effects might include:
organ damage. weakening of the immune system. development of allergies or asthma. reproductive problems and birth defects. effects on the mental, intellectual or physical development of children. cancer.Câu 1: Oxide nào sau đây là oxide lưỡng tính? 2 MgO A Fe203 B ZnO Cao D
Answer:
chưa hiểu đáp ánkia cho lắm. Nhưng đáp án là ZnO nha
Explanation:
Balance the equation:
Ca(PO4)2 + SiO2 = P4O10 + CaSiO3
Answer:
2Ca3(PO4)2 + 6SiO2 → P4O10 + 6CaSiO3.
Which would be considered a substance? Element, Compound, Mixture.
Answer:
MIXTURE , ELEMENT AND SUBSTANCE
Which of the following is a limitation of Bohr's model?
Bohr's model failed to explain the behavior of any atom
Bohr's model could not explain how electrons became excited
Bohr's model was able to explain the chemical behavior of only non-metals
Bohr's model was not able to explain the chemical behavior of any atom besides hydrogen
Answer:
The answer is:
The first option
Explanation:
Oil is less dense than water. What happens when you mix the two liquids together?
(A) Oil sinks to the bottom of the container.
(B) The two become one smooth mixture.
(C) The oil floats on top of the water.
(D) The water turns to gas inside the oil.
Answer:
(C) The oil floats on top of the water
Explanation:
If an object/substance is less dense than water it will float on the water.
If an object/substance has the same density as water it will stay submerged in the water, but will not sink to bottom.
If an object/substance is more dense than the water it will sink to the bottom.
Calculate the mass of 1.5 moles of calcium atoms
Answer:As we know that, one mole is equal to the one gram atom which is also equal to the molar mass. Therefore, the mass of 1.5 gram atom of calcium is 60 gram.
Explanation:
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Using the periodic table, explain which pair of the following gases have the most similar properties and why. Nitrogen (N), Fluorine (F), Neon (Ne), Krypton (Kr), and Oxygen (O).
Elements that belong to the same group of the periodic table (column) have similar properties. This is because elements of the same group have the same amount of valence electrons. This means that chemically and especially in a chemical reaction (or lack thereof), they will behave similarly.
Neon and Krypton are the only two gases in the list given that belong to the same group of the periodic table (Group 18 - Noble Gases) and as such have similar properties.
Similar Properties of Neon and Krypton:
- Both have 8 valence electrons - They both are very stable and almost unreactive- Both are gases at RTP-Both are odorless, colorless, and tasteless until interaction with an electrical charge.The color of the explosive mixture is yellow, green, and red-orange. Explain how the colors are formed and which three metals were most likely present in the rocket??
Answer:
m
Explanation:
Combustion produces carbon dioxide which is a greenhouse gas
O True
O False
Answer:
true
Explanation:
Carbon dioxide (CO2) makes up the vast majority of greenhouse gas emissions from the sector, but smaller amounts of methane (CH4) and nitrous oxide (N2O) are also emitted. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.