Answer:
B. a characteristic of a substance that can be measured or observed without changing the chemical identity of the substance
Explanation:
The definition of a physical property is " a property (as color, hardness, boiling point) of matter not involving in its manifestation a chemical change."
The only choice that matches this description fully is the second one, or B, so that is the answer.
hope this helps!
Which strategy will most decrease the number of people sickened by water-borne diseases?
a. increased use of solar power
b. increased use of fungicides
c. improved agriculture
d. better sanitation systems
Answer:
better sanitation systems
what is after gallium on the periodic table?
Answer:
Germanium or Ge
Explanation:
It is on the perioidic table. Gallium has an atomic number of 31 and Germanium has an atomic number of 32.
Determine the number of moles of gas contained in each of the following:
a. 1.25 L at 250.0 K and 1.06 atm
b. 0.80 L at 27°C and 0.925 atm
c. 7.50 102 mL at -50.0°C and 0.921 atm
(a) The number of moles of gas for first case is 0.065 mol.
(b) The number of moles of gas for second case is 0.03 mol.
(c) The number of moles of gas for third case is 0.038 mol.
Number of moles of the gasThe number of moles of the gas is determined by applying ideal gas equation as follows;
PV = nRT
n = PV/RT
where;
R is gas constant = 0.082057 L.atm/mol.KFor 1.25 L at 250.0 K and 1.06 atmn = (1.06 x 1.25) / (0.082057 x 250)
n = 0.065 mol.
For 0.80 L at 27°C (300 K) and 0.925 atmn = (0.8 x 0.925) / (300 x 0.082057)
n = 0.03 mol
750 mL at -50.0°C (223 K) and 0.921 atmn = (0.75 x 0.921)/(223 x 0.082057)
n = 0.038 mol
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how many sulfer is in h2s
Answer:
H2S is a hydride of sulfur while SO2 is an oxide of sulfur.
Explanation:
PLEASE HELP NEED ANSWER QUICK
An evacuated cylinder has a volume of 50 liters. If 20 liters of nitrogen gas and 20 liters of oxygen gas are pumped into this evacuated cylinder, how much of the cylinder is filled with the two gases? (3 points)
Only 80 percent because only 40 out of 50 liters are used.
The entire container because gases will expand to fill it.
Only 80 percent because of the low molecular weight of the two gases.
The entire container because of the low molecular weight of the two gases.
Answer: The entire container because gases will expand to fill it.
Explanation:
Can someone please help me? :(
D. Communication
Answer:
Cooperation
Explanation:
Those animals are understanding the needs of each other.
Elements strontium and beryllium sboth form a bond with fluorine with similar chemical formulas the similartiy in their formulas is due to:_________
Answer:
having the same number of valence electrons
Explanation:
I have 0.445 L of a 1.8 M NaCl solution. If I boil away some water until the volume of the solution reaches 0.250 L, what will the new molarity of the solution become?
Answer:
3.2 M
Explanation:
M1V1=M2V2
1.8*.445=.801
.801/.25=3.204
Molarity = M2 = 3.2 M
a. Two possible Lewis electron-dot diagrams for CO2 are shown above. Explain in terms of formal charges why diagram Z is the better diagram.
b. Identify the hybridization of the valence orbitals of the C atom in the CO2 molecule represented in diagram Z.
The carbon atom is SP hybridized while the oxygen atom is SP2 hybrized.
What are resonance structures?The term resonance structures are those structures that can be used to explain the bonding in a molecule. Sometimes, a single structure is insufficient in explaining the structure of a compound.
Now looking at the two sturctures, Z is better because there are mo formal charges which make the molecle less stable unlike in X. In the CO2 molecule, the carbon atom is SP hybridized while the oxygen atom is SP2 hybrized.
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When 20.00 mL of an unknown monoprotic acid is titrated with 0.125 M NaOH, it takes 15.00 mL to reach the endpoint. What is the molarity of the unknown acid?
Answer:
About 0.0940 M.
Explanation:
Recall that NaOH is a strong base, so it dissociates completely into Na⁺ and OH⁻ ions. Because the acid is monoprotic, we can represent it with HA. Thus, the reaction between HA and NaOH is:
[tex]\displaystyle \text{HA}_\text{(aq)} + \text{OH}^-_\text{(aq)} \longrightarrow \text{H$_2$O}_\text{($\ell$)} + \text{A}^-_\text{(aq)}[/tex]
Using the fact that it took 15.00 mL of NaOH to reach the endpoint, determine the number of HA that was reacted with:
[tex]\displaystyle \begin{aligned} 15.00\text{ mL} &\cdot \frac{0.125\text{ mol NaOH}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} \\ \\ &\cdot \frac{1\text{ mol OH}^-}{1\text{ mol NaOH}} \cdot \frac{1\text{ mol HA}}{1\text{ mol OH}^-}\\ \\ & = 0.00188\text{ mol HA}\end{aligned}[/tex]
Therefore, the molarity of the original solution was:
[tex]\displaystyle \left[ \text{HA}\right] = \frac{0.00188\text{ mol}}{20.00\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.0940\text{ M}[/tex]
In conclusion, the molarity of the unknown acid is about 0.0940 M.
A molecule that is _____ loses electrons, and a molecule that is _____ gains electrons. oxidized; reduced negative; positive reduced; oxidized weak; polar None of the other answer options is correct.
Answer:
Oxidized, and reduced
Explanation:
The acronym LEO, and GER may be helpful, or think of a specific example (such as a copper 2+ ion being reduced into copper).
Loose
Electron
Oxidization
Gain
Electron
Reduction
from this, we know that a molecule which looses electrons is being oxidized, and a molecule that gains electrons is being reduced.
Speed is defined as __________.
A) the change in position and direction over time
B) the change in acceleration over time
C) the change in velocity over time
D) the distance traveled over time
Answer:D)
Explanation: the distance traveled over time
Which term describes this reaction?
O addition
O condensation
O elimination
O substitution
Answer:
addition
Explanation:
I really don't know why
how much heat would be released if 2 moles of nitrogen and 2 moles of oxygen form 4 moles of NO (g) at 101.3 kPa and 298 K
-361 kJ/mol heat would be released if 2 moles of nitrogen and 2 moles of oxygen form 4 moles of NO (g) at 101.3 kPa and 298 K.
What is the enthalpy of formation?Enthalpy of formation is defined as the heat change that is needed for formation of one mole of a substance from its constituent elements in pure state.
In the present case, Heat of formation of 4 moles of NO (g) at 101.3 kpa and 298 k is -90.25 kJ/mol. The Negative sign indicates that, heat is evolved from the system.
Thus, for 4 moles of NO, the heat of formation will be 4 X (-90.25 kJ/mol) = -361 kJ/mol.
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Where does most regular lightning occur?
A. The stratosphere
B. The troposphere
C. The Mesosophere
Answer:
the troposphere because we are living in atmosphere when the atmosphere next troposphere the sudden flashes of light and discharge resulting atmosphere condition sound waves of trambeling
thank you
.How many grams of NaCl required to form a 500ml solution with a molarity of 0.5M , the molar mass of NaCl is 58.5g/mol?
What type of heat transfer does not need to travel through matter?.
2.00 L of 0.800 M NaNO3 must be prepared from a solution known to be 2.50 M in concentration.How many mL are required? Plus don't send me virus links!!!! pls explain how to do it
Answer:
1.36 × 10³ mL of water.
Explanation:
We can utilize the dilution equation. Recall that:
[tex]\displaystyle M_1V_1= M_2V_2[/tex]
Where M represents molarity and V represents volume.
Let the initial concentration and unknown volume be M₁ and V₁, respectively. Let the final concentration and required volume be M₂ and V₂, respectively. Solve for V₁:
[tex]\displaystyle \begin{aligned} (2.50\text{ M})V_1 &= (0.800\text{ M})(2.00\text{ L}) \\ \\ V_1 & = 0.640\text{ L} \end{aligned}[/tex]
Therefore, we can begin with 0.640 L of the 2.50 M solution and add enough distilled water to dilute the solution to 2.00 L. The required amount of water is thus:
[tex]\displaystyle 2.00\text{ L} - 0.640\text{ L} = 1.36\text{ L}[/tex]
Convert this value to mL:
[tex]\displaystyle 1.36\text{ L} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 1.36\times 10^3\text{ mL}[/tex]
Therefore, about 1.36 × 10³ mL of water need to be added to the 2.50 M solution.
According to the brønsted–lowry definition of acids-base reaction, acids have the ability to.
Answer:
gain, or accept, a hydrogen cation
Explanation:
Hope this helps! :)
An ideal gas, initially at a volume of 6 L and pressure of 8 kPa, undergoes isothermal expansion until its volume is 8 L and its pressure is 6 kPa. Calculate the work done by the gas during this process. Answer in units of J.
The work done by the gas against an external pressure during the isotherma expansion is -12 J.
Work done by the gas against an external pressure
The work done by the gas against an external pressure during the isotherma expansion is calculated as follows;
W(net) = ΔP x ΔV
where;
ΔP is the change in pressure for the cyclic processΔV is change in volumeW(net) = (6 kPa - 8kPa) x (8L - 2L)
W(net) = - 12 kPa.L
W(net) = -12 J
Thus, the work done by the gas against an external pressure during the isotherma expansion is -12 J.
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Easy question
Who is the youngest in ateez
Answer: jongho
Explanation:
Answer:
Choi JongHo
Explanation:
The diagram below shows the different phase transitions that occur in matter.
Three bars are shown labeled Solid, Liquid, and Gas. They are connected by arrows labeled 1 to 6. Arrow 1 points from liquid to gas; arrow 2 from solid to liquid, arrow 3 from solid to gas, arrow 4 from gas to liquid, arrow 5 from liquid to solid, and arrow 6 from gas to solid.
Which arrow would most likely represent the phase change that occurs when silver is poured into a mold and cools to become a solid bar?
1
3
4
5
Answer:
# 5
Explanation:
The question describes silver being "poured" into a mold and cools to become a solid bar. This is the phase of liquid to solid. When a element cools down below it's freezing points to become a solid.
Liquid to Solid Definition:
Freezing, or solidification, is a phase transition in which a liquid turns into a solid when its temperature is lowered to or below its freezing point. All known liquids, except helium, freeze when the temperature is low enough.
2. How many grams of CaCl₂ are needed to prepare 125 mL of a 2.00 M solution of aqueous CaCl₂(aq)?
(M, molarity)
Answer:
The solution contains 0.50 mol or 55 g of CaCl2.
Explanation:
What is the name of this molecule?
H
O A. Propene
• B. Butene
C. Butane
D. Propane
Answer:
D
explaination:
the "prop" stands for three carbons , and this is an alkane so that means it only has single bonds between carbon and hydrogen , hence the name propane
An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity?
A. carbon
B. fluorine
C. nitrogen
D. oxygen
Which of the following chemical reactions will produce a precipitate?
Answer:
naclo4+koh naoh+kclo4
Explanation:
if you know your cemestry
Answer:
it's A
Explanation:
22.0 mL of stock solution is used
to produce a .458 M solution after
dilution with 50.0 mL of water. What
is the molarity of the stock solution?
Answer:
0.202M
Explanation:
you will want to use C₁V₁=C₂V₂ to solve for this.
C₁ is the initial concentration, in this problem it is .458 mol/L or M
V₁ is the initial volume, so it will be the 22.0 mL or 0.0220L
C₂ is the new concentration but here it is unknown.
V₂ is the new volume which is 50.0 mL or 0.0500L.
1. So now we plug this information in to the equation:
[tex](.458 mol/l)(0.0220L)=(C_{2} )(0.0500L)[/tex]
2. We then do algebra to get C₂ alone:
[tex]C_{2} =\frac{(.458 mol/L)(0.0220L)}{(0.0500L)} =0.20152 mol/L or M[/tex]
The liters cancel out and take note of the significant figures, there are 3 digits in all numbers in the question, so that means your answer must contain 3 sig figs. The answer 0.0202 rounded.
** instead of converting the mL to L you can also just keep them mL since they will be crossed out anyway. You will still get the correct answer.
Hope this help you! good luck :)
A gas is contained in a tick walled balloon. When the pressure changes from 2. 95atm to ___atm, the volume changes from 7. 456L to 4. 782L and the temperature changes from 379k to 212k
A gas is contained in a tick-walled balloon. When the pressure changes from 2. 95atm to 2.57 atm. p.
What is pressure?Pressure is a force perpendicular to the unit area on which it is applied.
Given that, P1, the initial pressure is 2.95 atm
The initial volume, V1 = 7.456 L
The final volume, V2 = 4.782 L
The initial temperature, T1 = 379k
The final temperature, T2 = 212k
The equation will be
[tex]\dfrac{P_1V_1}{T_1 } =\dfrac{P_2V_2}{T_2}[/tex]
Putting the values in the equation
[tex]\dfrac{2.95 \times 7.456 L }{379k } =\dfrac{P_2\times 4.782 L}{212k}\\\\\\P_2 = \dfrac{2.95 \times 7.456 L \times 212k }{379k \times 4.782 L} = 2.57\;atm.[/tex]
Thus, the pressure changes from 2. 95atm to 2.57 atm p.
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How/why do acids and bases different from weak acids and bases?
Answer:
Weak acids and bases are less than 100% ionized in aqueous solution
Explanation:
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What happens during reduction?
Loss of electrons
Gain of electrons
Loss of protons
Gain of protons
Answer:
The answer is Gain of electrons
Explanation:
Oxidation is the process of losing an electrons, while reduction is the process of gaining them.
Answer:
Gain of electrons