H20 + C02...................
Answer:
NICE
Explanation:
TOES
People can obtain groundwater by drilling a well
Answer:
yes this is I think a true statement
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:
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:
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
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
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.
How many protons, neutrons, and electrons make up an ion of
phosphorus-28 that has a -3 charge?
11 Pt
Answer:
protons=15
electron=15
neutron=16
Which would be considered a substance? Element, Compound, Mixture.
Answer:
MIXTURE , ELEMENT AND SUBSTANCE
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 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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3. The set up below was used to collect gas K, produced by the reaction between water and calcium metal. Gask Water calcium Metal (b) At the end of the experiment, the solution in the beaker was found to be a weak base. Explain why the solution is a weak base
Ca(s) + 2H2O(l) = Ca(OH) 2(aq) + 2H2(g)
The gas K collected is hydrogen gas.
The solution after the experiment is found to be weak base because Ca(OH)2 is sparingly soluble in water forming a weak base.
A carbonated drink is a
a. mixture of gases and liquids.
b. heterogeneous mixture.
C. mixture of two immiscible liquids.
d. compound.
Help!
An engineer is investigating the ways in which electroplating is currently
done. This is an example of which step in the engineering process?
Answer:
Background research
Explanation:
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
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.
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
how many electrons can fit in the third energy level
Answer:
18 electrons
Explanation:
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.
hahahahhaahahahahhahacbhad
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
Como se forman los gases contaminantes en el medio ambiente
Los principales mecanismos de contaminación en el medio ambiente son los procesos industriales que implica combustión,tanto en industrias como automóviles o calefacciones residenciales,que generan dióxido y monóxido de carbono, óxidos de nitrógeno y azufre,entre otros contaminantes.
Define physical and chemical properties, provide three examples of each, DISCUSS THEIR REVERS ABILITIES, and
explain the fundamental differences between them.
I really need the reverse abilities.
Explanation:
the physical and chemical has different meaning
and the three examples are to discuss, reverse
and the ability.and to reverse the ability is to provide
the physical and chemical definement.
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
The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is –5074 kJ/mol. The reaction equation is: C8H18(l) + 12.5O2(g) arrwo 8CO2(g) + 9H2O(g).
What is the enthalpy of formation for this reaction?
16CO2(g) + 18H2O(g) arrow 2C8H18(l) + 25O2(g)
The enthalpy change for reaction (2) is 10178 kJ/mol.
What is enthalpy of reaction?
The term enthalpy of reaction has to do with the heat that is evolved or absobed in a chemical reaction.
We have the equations;
C8H18(l) + 12.5O2(g) -----> 8CO2(g) + 9H2O(g).16CO2(g) + 18H2O(g) ----->2C8H18(l) + 25O2(g)We can see that equation (2) is obtained from (1) by multiplication using a factor of 2. and also (2) is a reverse of (1). It then follows that the enthalpy change for reaction (2) is 10178 kJ/mol.
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Answer:
10,148 kJ
Explanation:
The process of raising fish in a controlled area for the purpose of feeding the human population is called
Answer:
AQUACULTURE
*Explanation*
Aquaculture is the controlled process of cultivating aquatic organisms, especially for human consumption. It's a similar concept to agriculture, but with fish instead of plants or livestock. Aquaculture is also referred to as fish farming.
pleas
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Answer:
B.
Explanation:
yan sagot ko tnx sa points
Which of an atom's electrons are involved in chemical reactions?
a. The electrons farthest from the nucleus of the atom
b. The electrons that make one isotope different from another
c. The electrons that determine the atomic number of the atom
d. The electrons closest to the nucleus of the atom
Answer:
A is the correct answer
Answer:
A. The electrons farthest from the nucleus of the atom
Explanation:
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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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.