Answer:The amount of energy used or released as heat in a reaction.
Explanation:
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?
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:
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
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Answer:
B.
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.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
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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Which would be considered a substance? Element, Compound, Mixture.
Answer:
MIXTURE , ELEMENT AND SUBSTANCE
Convert 2.68 mol H2O to molecules H2O
Timed test
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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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
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:
People can obtain groundwater by drilling a well
Answer:
yes this is I think a true statement
In which year were the populations of light and dark colored moths the most different?
Answer: 1900
Explanation:
I’m not sure but in 1900 98% of the moths were dark
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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Which is the larger species in each pair?
a. Sr or Sr2+
b. N or N3-
c. Ni or Ni2+
d. S2- or Ca2+
The element which larger species in each pair are Sr ,N3-, Ni, S2-.
What is an element ?A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
A substance made up of only one kind of atom, all of which have the same number of protons, is said to be an element. One famous illustration is pure gold. A ring constructed of pure gold would be composed of countless millions of atoms, each with the same atomic number and 79 protons in its nucleus.
The three categories of elements are metal, non-metal, and metalloid. Metals like sodium, calcium, caesium, and other elements on the extreme left of the periodic table are examples of this.
Thus, The element which larger species in each pair are Sr ,N3-, Ni, S2-.
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In order for hydrogen bonding to occur, the compound has to have a
hydrogen attached to one of three atoms. Which of the following is NOT
one of those three atoms?
Nitrogen
Fluorine
dh, Chlorine
Oxygen
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.
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:
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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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
A carbonated drink is a
a. mixture of gases and liquids.
b. heterogeneous mixture.
C. mixture of two immiscible liquids.
d. compound.
Help!
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.
H20 + C02...................
Answer:
NICE
Explanation:
TOES
Balance the equation:
Ca(PO4)2 + SiO2 = P4O10 + CaSiO3
Answer:
2Ca3(PO4)2 + 6SiO2 → P4O10 + 6CaSiO3.
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:
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.write at least on paragraph about space exploration and why it interests you. The moon can certainly be your focus however, you may be interested in exploring other planets within or outside our own solar system.
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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.
Which property is a chemical property of a substance?
Answer:
A chemical property is a characteristic of a particular substance that can be observed in a chemical reaction. Some major chemical properties include flammability, toxicity, heat of combustion, pH value, rate of radioactive decay, and chemical stability.