A given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.
What are the states of matter?The states of matter refer to the separation of the molecules of a given material in certain temperature conditions.
The states of the matter are three and include the gaseous state, liquid state and solid-state.
In conclusion, a given substance that has a melting point of -7C and a boiling point of 59C exists as a liquid at room temperature conditions.
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If 321.5 grams of phosphorus chloride are made, how many grams of phosphorus were consumed?
If 321.5 grams of phosphorus chloride are made, then 168.235 grams of phosphorus were consumed.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massMoles of phosphorous chloride = 321.5g / 74.55g/mol = 4.315 mole
Given chemical reaction is:
2K + Cl₂ → 2KCl
From the stoichiometry of the reaction:
2 moles of KCl = produced by 2 moles of K
4.315 moles of KCl = produced by 4.315 moles of K
Mass of potassium = (4.315mol)(39g/mol) = 168.235 g
Hence required mass of phosphorous is 168.235 g.
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Which of the following reactions shows a chemical change producing a solid?
2CH₂OH()+30₂(g) → 200₂(g) + 4H₂O(1) 2AgNO3(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO3)2(aq) H₂(g) + O₂(g) → H₂O(l) NaCl(s) → NaCl(aq)
The chemical change producing a solid would be [tex]2AgNO_3(aq) + CaBr_2(aq) --- > 2AgBr(s) + Ca(NO_3)_2(aq)[/tex]
What are precipitation reactions?They are reactions involving two soluble salts with one of the products being an insoluble salt.
In the reaction below: [tex]2AgNO_3(aq) + CaBr_2(aq) --- > 2AgBr(s) + Ca(NO_3)_2(aq)[/tex]
[tex]AgNO_3[/tex] and [tex]CaBr_2[/tex] are soluble salts while [tex]AgBr[/tex] produced is an insoluble salt. The insoluble salt is a solid.
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Answer: 2AgNO3(aq)+CaBr2(aq)—>2AgBr(s)+Ca(NO3)2(aq)
Explanation:
just did on apex; 2AgNO3(aq)+CaBr2(aq)>2AgBr(s)+Ca(NO3)2(aq)
7. Which metal is more easily oxidated, copper or aluminum?
Answer:
alumimum
Explanation:
Aluminum oxidation happens faster than that of steel, because aluminum has a really strong affinity for oxygen. Rather than flaking though, aluminum oxide just forms a hard, whitish-colored surface skin. When all the aluminum atoms have bonded with oxygen the oxidation process stops.
hope this answers your question.
Devices that use a liquid spray to remove pollutants from the air are called __________. A) alloys B) particulates C) scrubbers D) minerals E) chlorofluorocarbons (CFCs)
Devices that use a liquid spray to remove pollutants from the air are called scrubbers. The correct option is C.
What is a wet scrubber?Wet scrubber is a pollution removing technique from the air. It is a sprayer which trap the harmful gas molecules from the air.
It is used in factories and industrial exhaust steams.
Thus, the correct option is C. scrubbers.
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One form of energy can transform into another form of energy.
17 Energy in a flashlight's battery changes from ________ energy to electrical energy.
Answer:
Chemical
Explanation:
Chemical energy is stored in the batteries of a flash light. When the flashlight is used, the Chemical energy that was stored, is then used to make Electrical energy for the flashlight. Then electrical energy is converted to heat in the filament of the flashlight bulb. Some of the heat is lost to the surroundings, and some is converted into light energy.
Which products are formed when propane (C3Hg) undergoes combustion?
O A. Water and carbon
OB. Water and carbon dioxide
OC. Hydrogen and carbon dioxide
OD. Water, carbon dioxide, and oxygen
Answer:
Water and carbon dioxide
Explanation:
The product of combustion for all hydrocarbons are carbon dioxide and water
Two objects are filled with air, and have the exact same mass. There air in the first object is heated and it now has a higher temperature than the second object. The air in which object has more thermal energy?
What substances had lower thermal conductivity, metal,
wood, or plastic
Answer: plastic
Explanation:
The thermal conductivity of a material is highly depending on composition and structure. Generally speaking dense material such as medals and stone are good conductors of heat while load density substances such as gas and porous installations are poor conductors of heat
Answer:
Or plastic
Explanation:
May be useful................
The diagram shows that the potential energy of the products is lower
than the potential energy of the reactants. Which type of reaction is
shown?
(Once it hits the top of the hill it says activation energy
Once it hits the bottom to the word products it says heat of reaction)
A: this is an exothermic reaction because the reactants have less energy than the products
B: this is an endothermic reaction because the reactants have more energy than the products
C: this is an endothermic reaction because the reactants have less energy than the products
D: this is an exothermic reaction because the reactants have more energy than the products
Answer: D
Explanation:
Mechanism of cell destruction of Poison oak
PLEASE HURRY AND CHECK IMMAGE. Predict the shape of the molecule.
0
H
H
A. bent
B. linear
C. trigonal planar
D. tetrahedral
Answer:
A. bent
Explanation:
What is the "modern" definition of atomic theory?
Answer: The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different. Each element has its own characteristic atomic number. Atoms of the same element can have different numbers of neutrons, however.
Explanation: N/A
S + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2O
In the above equation, how many grams of water can be made when 19.5 moles of HNO3 are consumed?
Answer:
117 grams H₂O
Explanation:
To find the amount, you need to (1) convert from moles HNO₃ to moles H₂O (via mole-to-mole ratio from equation) and then (2) convert from moles H₂O to grams (via molar mass from periodic table). The final answer should have 3 sig figs according the the given value (19.5).
S + 6 HNO₃ --> H₂SO₄ + 6 NO₂ + 2 H₂O
Molar Mass (H₂O): 15.999 g/mol + 2(1.008 g/mol)
Molar Mass (H₂O): 18.015 g/mol
19.5 moles HNO₃ 2 moles H₂O 18.015 grams
-------------------------- x ---------------------- x ---------------------- = 117 grams H₂O
6 moles HNO₃ 1 mole H₂O
What is the mass of 11.5 moles of lithium
Answer:
1 moles =6.9g
11.5moles= x
then we have x=79.35g
What is the name of the functional group that is attached to this hydrocarbon? a carbon atom is single bonded to o h to the right, and h below, left, and above. alkyl halide alcohol carbonyl ketone
The name of the functional group of the hydrocarbon that has a chemical formula of CH3OH is alcohol (OH). Details about alcohol can be found below.
What is a functional group?In chemistry, a functional group is a specific class of a group of compounds that determines the chemical properties of the group.
The hydrocarbon given in this question has the chemical formula of CH3OH is methanol. Methanol as the name implies has a functional group called alcohol.
Therefore, the name of the functional group of the hydrocarbon that has a chemical formula of CH3OH is alcohol (OH).
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Short Essay!
Explain how scientists have used the concept of metallic bonding to account for many of the physical properties of metalssuch as electrical conductivity and malleability .
PLS HELP!!
Answer:
Explanation:
Because electrons are delocalized around positively charged nuclei, metallic bonding explains many properties of metals. Electrical conductivity: Most metals are excellent electrical conductors because the electrons in the electron sea are free to move and carry charge.
Find the final temperature when 10 grams of aluminum at 130 c mixes with 200 grams of water at 25 c. assume no water is lost as water vapor. specific heat values (c) for aluminum= 0.901 j/g c and water 4.18 j/g c
Answer:
About 26.12 C°
Explanation:
Following q = mc∆t, assuming q is the same
(10g)(130 - T)(0.901j/g*c) = (200.0g)(T - 25)(4.18j/g*c)
T = 26.12
In an experiment, the same mass of magnesium metal reacted with the same amount of two different acids. the acid used in reaction 1 was ethanoic acid and in reaction 2 it was hydrochloric acid. which reaction produced the most gas?
The mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
What is the mole ratio of a reaction?The mole ratio of a reaction is the ratio in which the reactants and products of a given reaction occur for the reaction to proceed to completion.
The mole ratio of a reaction is also known as the stoichiometry of the reaction.
The equation of the two reactions are given below:
[tex]Mg + 2HCl \rightarrow MgCl_2 + H_2[/tex]
[tex]Mg + 2CH_3COOH \rightarrow (CH_3COO)_2Mg + H_2 \\ [/tex]
From the equation of the reaction reaction, an equal volume of hydrogen gas will be produced by the two reactions.
Therefore, the mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
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(1) it takes 40 ml of a 0.25 m naoh solution to neutralize 100 ml of an hcl solution. what is the concentration of the hcl solution?
Answer:
0.1M
Explanation:
Using Neutralisation formula,
MaVa=MbVb
>>(0.25)(40)=Mb(100)
Mb=0.1M
What makes this lever effective?
A: The man had more mass than the rock
B: The man is closer to the fulcrum than the rock is
C: The man is farther from the fulcrum than the rock is
D: The rock has more mass than the man
NEED HELP ASAP!
What is the frequency of a wave that has a wavelength of 28m? Remember that c = 2.998 x 10^8 m/s
A.) 10 Hz
B.) 1.07 x 10^7 Hz
C.) 10.7 Hz
D.) 2.3 x 10^7 Hz
Answer:
Frequency = Speed/wavelength
Frequency = 2.998 x 10^8 m/s ÷ 28m
Frequency = 1.07 x 10^7 Hz
How do you think the light would travel if the laser pointer was 1000 meters away?
It is entirely dependent on the laser power (mW). The light's divergence is affected by it.
What exactly is a laser?A laser is a device that produces a powerful beam of coherent monochromatic light by stimulating the emission of photons from excited atoms or molecules.
A laser is generated when electrons in optical materials such as glass, crystal, or gas absorb energy from an electrical current or light.
We can see a 5mW 650 nm laser glowing on a white surface in full darkness from 500 to 1 kilometer away.
As a result of the divergence, the predicted dot 1 km away will be a massive dot with a diameter of 20–30 m30 m and will be exceedingly dark.
As a result, it is entirely dependent on the laser.
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What reactant concentrations, pressure and temperature conditions would favor the production of the substance that is underlined in each of the following equations. Make sure you address all three of the factors listed above for each equilibrium.
a) 2CO(g) + O2(g) <--> 2CO2 (g) + 167 kJ
b) Cu2+(aq) + 4NH3(aq) <--> Cu(NH3)42+(aq) + 42 kJ
c) 2HI(g) + 12.6 kJ <--> H2(g) + I2(g)
d) 4HCl(g) + O2(g) <--> 2H2O(g) + 2Cl2(g) + 113 kJ
e) PCl5(g) + 88 kJ <--> PCl3(g) + Cl2(g)
Answer:
a) Increase the pressure, Increase the reactants, Decrease the temperature
b) No effect on pressure, Increase the reactants, Decrease the temperature
c) No effect on pressure, Increase the reactants, Increase the temperature
d) No effect on pressure, Increase the reactants, Decrease the temperature
e) Decrease the pressure, Increase the reactants, Increase the temperature
I had to look up the questions online because you did not underline them properly, but yeah these should be the respective conditions for each equation
Increasing pressure shifts equilibrium to the side with the least amount of gas moles, decreasing pressure does the opposite
Increasing Reactants will cause more products to be made
Increasing temperature in an endothermic reaction will shift equilibrium to the right, and in the opposite direction if the reaction is exothermic (left)
Decreasing temperature in an endothermic reaction will shift equilibrium to the left, and in the opposite direction if the reaction is exothermic (right)
A student has a sample of 1.33 moles of fluorine gas that is contained in a 23.3 L container at 314 K. What is the pressure of the sample? The ideal gas constant is 0.0821 L*atm/mol*K. Round your answer to the nearest 0.01 and include units.
1.4715 atm is the pressure of the sample 1.33 moles of fluorine gas that is contained in a 23.3 L container at 314 K.
What is an ideal equation?
The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas. The terms are: p = pressure, in pascals (Pa).
Given data:
Volume (V) = 23.3 L
Number of mole (n) = 1.33 moles
Temperature (T) = 314 K
Gas constant (R) = 0.821 atm.L/Kmol
Pressure (P) =?
The pressure inside the container can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
P × 23.3 L = 1.33 moles × 0.0821 ×314 K
P = 1.4715 atm
Therefore, the pressure of the sample is 1.4715 atm.
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If I have 340 mL of a 1.5 M NaBr solution, what will the concentration be if I add 560 mL more water to it?
Answer:
0.5667 M ≅ 0.57 M.
Explanation:
It is known that the no. of millimoles of a solution before dilution is equal to the no. of millimoles of the solution after the dilution.
It can be expressed as:
(MV) before dilution = (MV) after dilution.
M before dilution = 1.5 M, V before dilution = 340 mL.
M after dilution = ??? M, V after dilution = 340 mL + 560 mL = 900 mL.
∴ M after dilution = (MV) before dilution/(V) after dilution = (1.5 M)(340 mL)/(900 mL) = 0.5667 M ≅ 0.57 M.
What are some reasonable safety precautions for conducting field investigations
in polar climates?
Answer:
warm clothing hiking sticks safter gear. food water. the basics
Classify: Heat that is transferred in a circular motion with warm particles rising and cool
particles sinking in a gas and liquid is called____
Convection
Conduction
Radiation
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What is the half-life of an isotope if after 14 days you have 31.25 g remaining from a
250.0 g sample?
Answer:
4 2/3 days
Explanation:
31.25 = 250 ( 1/2)^n solve for n
31.25/250 = 1/2 ^n log both sides to find n = 3 half lives
14 days = 3 half lives
14/3 = 4 2/3 day half life
Why do some cells make food molecules?
Answer:
All living cells release energy from food molecules through cellular breathing and/or fermentation. Some cells make food molecules using light energy through the process of (making food from light).
Making food from light- Photosynthesis
Breathing- Respiration
All living units give out power for a given time from food small complex units through formed of small units breathing and or fermentation. Some units make food small complex units using light power for a given time through the process of (making food from light).
Water cools from 2oc to -2oc. during this time, what happens to the motion of the molecules?
Answer:
The motion of the molecules remains the same.