QUESTION 20 Which of the following is a producer? oak tree raccoon cockroach human
Answer:
may be the first one is a producer
A.
B.
C.
D.
Help me please?
Answer:
B: it allow quick conversation to others
CHEMISTRY PUNKS PLEASE HELP ME OUT!!!!!!!!!!!!!!!!! PLS. ILL LOVE U FOREVER N EVER! any point stealers will be reported <3
Answer: 25.0 L
Explanation:
For this problem, we will need to use Boyle's Law.
Boyle's Law: P₁V₁=P₂V₂
Since we are looking for V₂, we can rewrite the equation.
V₂=P₁V₁/P₂
The pressure should be in atm, so let's convert kPa to atm.
P₁=100 kPa=0.99 atm
P₂=200 kPa=1.97 atm
Now that we know the pressure in atm, we can plug it into the equation and solve.
[tex]V_{2} =\frac{(0.99 atm)(50.0L)}{1.97atm}[/tex]
[tex]V_{2} =25.0 L[/tex]
Determine the boiling point of a 3.70 m solution of phenol in benzene. Benzene has a boiling point of 80.1°C and a boiling point elevation constant of 2.53°C•kg/mol.
Answer: The boiling point of a 3.70 m solution of phenol in benzene is [tex]89.5^0C[/tex]
Explanation:
Elevation in boiling point:
[tex]\Delta T_b=i\times k_b\times m[/tex]
where,
[tex]\Delta T_b[/tex] = change in boiling point
i= vant hoff factor = 1 (for benzene which is a non electrolyte )
[tex]k_b[/tex] = boiling point constant = [tex]2.53^0C/kgmol[/tex]
m = molality = 3.70
[tex]T_{solution}-T_{solvent}=i\times k_b\times m[/tex]
[tex]T_{solution}-80.1^0C=1\times 2.53\times 3.70[/tex]
[tex]T_{solution}=89.5^0C[/tex]
Thus the boiling point of a 3.70 m solution of phenol in benzene is [tex]89.5^0C[/tex]
Answer:
First Question:
C. ΔTb = Kbm
Second Question:
C. 9.36° C
Third Question:
89.5
Explanation:
Got it right.
Builders and dentists must store plaster of Paris,
CaSO4 x 1/2 H2O, in airtight containers to prevent it from
absorbing water vapor from the air and changing to
gypsum, CaSO4 x 2H2O How many liters of water
vapor evolve when 2.00 kg of gypsum are heated at
110°C to produce plaster of Paris? At 110°C, the
density of water vapor is 0.574 g/L.
In order to determine the amount of water that evaporates from we need to convert the mass into volume.
What temperate is required to produce the POP ?The builders and the density use the plaster of Paris called POP and are a CaSO4 x 1/2 H2O is used for the airtight containers to stop them from taking in water vapors from the air and changes into gypsum that is CaSO4 x 2H2O. The answer is given as below. Answer:
The plaster of Paris is used for coating the walls and the celling from the aspects of molding. Its also used for casting decorative elements.
It absorbs water from the air and vapor evolves when the 2.00 kg of gypsum is heated at 110 degrees. C.
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What is the voltage of an electrolytic cell with copper and magnesium
electrodes?
A. 2.71 V
B. -2.71 V
C. 2.03 V
D. -2.03 V
Answer:
A. 2.71 V
Explanation:
The standard reduction potential, E° of the metals are as follows:
Mg²⁺ + 2e⁻ ⇌ Mg; E° = -2.372
Cu²⁺ + 2e⁻ ⇌ Cu; E° = +0.337
Since magnesium has the the lower E°, it will serve as the anode in the electrolytic cell while copper will serve as the cathode.
At the anode; Mg ⇌ Mg²⁺ + 2e⁻, E° = -2.372
At the cathode; Cu²⁺ + 2e⁻ ⇌ Cu, E° = +0.337
EMF of the cell = E° cathode - E° anode = 0.337 - (-2.372) = 2.71 V
Therefore, EMF of the cell is 2.71 V
Answer:-2.71 is the correct answer
Explanation:
A P E X
How did Robert Whitaker change dassification?
Answer:
created an organizational hierarchy
Explanation:
How do forces between particles in solids compare to forces in the other
states of matter?
O A. The forces in solids are stronger than forces in liquids and gases.
O B. The forces in solids are weaker than forces in liquids and gases.
O C. The forces in solids are stronger than forces in liquids but weaker
than forces in gases.
D. The forces in solids are weaker than forces in liquids but stronger
than forces in gases.
Answer:
the answer is A
Explanation:
Forces are the intermolecular interaction between the matter. Forces present in a solid are strongest. Thus, option A is correct.
What are the phases of matter?The matter is any substance that occupies a volume. Matter can be a solid, gas, or liquid. The solid phase particles are tightly closed to each other making the force strong.
The particles of liquids that are not too compact are a little free and in gases, the particles are very free, which makes the bonding and the force the weakest.
Therefore, option A. the solids have the strongest intermolecular bonding.
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1. 7.85 g of sodium metal is added to 200 mL of 0.0450 M HNO3
a) Predict the mass of the precipitate
b) Predict the amount of excess reagent left over
c) Volume of gaseous product at STP conditions
Answer:
a)0.765 g
b)7.613 g
c)0.20 L
Explanation:
Consider the reaction involved;
Na(s) + HNO3(aq) ----> NaNO3(s) + H2(g)
Note that, if a hot, saturated aqueous solution of sodium nitrate was allowed to cool, solid sodium nitrate would crystallise out of the solution and this would also be classed as a precipitate. This is the case here.
Number of moles of sodium reacted= mass of sodium reacted/ molar mass of sodium
Number of moles of sodium= 7.85g/23gmol-1
Number of moles of sodium= 0.34 moles of sodium
Number of moles of acid reacted= concentration of acid × volume of acid
Number of moles of acid= 0.0450 × 200/1000
Number of moles of acid= 9×10^-3 moles
Therefore, HNO3 is the limiting reactant.
1 mole of HNO3 yield 1 mole of NaNO3
9×10^-3 moles of HNO3 yield 9×10^-3 moles of NaNO3
Hence mass of NaNO3= number of moles × molar mass
Mass of NaNO3= 9.0×10^-3 moles × 84.9947 g/mol
Mass of NaNO3= 0.765 g of NaNO3
b)
Since
1 mole of sodium metal reacts with 1 mole of HNO3
9×10^-3 moles of sodium reacts with 9×10^-3 moles of HNO3
Therefore amount of unreacted sodium metal = 0.34 moles - 9×10^-3 moles = 0.331 moles
Mass of unreacted sodium metal = 0.331 moles × 23 gmol-1= 7.613 g
c)
If 1 mole of HNO3 yields 1 mole of hydrogen gas
9×10^-3 moles of HNO3 yields 9×10^-3 moles of hydrogen gas.
1 mole of hydrogen gas occupies 22.4 L
9×10^-3 moles of hydrogen gas will occupy 9×10^-3 moles × 22.4/1 = 0.20 L
Select True or False: Nitric acid is formed by the gas-phase hydrolysis of N2O5. The energy profile curve for the reaction N2O5 H2O → 2HNO3 is shown here. The reaction is endothermic and the activation energy of the reverse reaction is larger than for the forward reaction.
Answer:
True
Explanation:
Because Nitric acid is formed by the gas-phase hydrolysis of N2O5. The energy profile curve for the reaction N2O5 H2O → 2HNO3 is shown here. The reaction is endothermic and the activation energy of the reverse reaction is larger than for the forward reaction.
A solution is made by mixing 114.g of benzene C6H6 and 83.g of acetyl bromide CH3COBr. Calculate the mole fraction of benzene in this solution. Round your answer to 3 significant digits.
A solution is made by mixing 114.g of benzene C6H6 and 83.g of acetyl bromide CH3COBr, the mole fraction of benzene in this solution is 1.45mol.
What is molar mass ?The term molar mass is defined as the compound is often calculated by adding the quality atomic masses in g/mol of the constituent atoms.
Molar mass of CH3COBr,
Molar Mass = 2 × MM(C) + 3 × MM(H) + 1 × MM(O) + 1 × MM(Br)
= 122.944 g/mol
Molar mass of C6H6,
MM = 6 × MM(C) + 6 × MM(H)
= 6 × 12.01 + 6 × 1.008
= 78.108 g/mol
n(CH3COBr) = mass/molar mass
= 83 /122.944
= 0.675
n(C6H6) = mass/molar mass
= 114 / 78.108
= 1.45
n(CH3COBr),n1 = 0. 675mol
n(C6H6),n2 = 1. 45mol
Thus, the mole fraction of benzene in this solution is 1.45mol.
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In the movie bee movie how does the bee berry communicate
Answer:
they stick together as a group and that they berly fought or argue
Answer:first get a jar
Explanation:
Patrick that’s a jokers side special
Why does an ultraviolet light cause paint to fade
Answer:
There are light absorbing color bodies called chromophores that are present in dyes. Ultraviolet rays are one of the causes of fading because they can break down chemical bonds and fade the color in objects.
What is the total energy change for the following reaction: H2 + I2 -> 2HI?
Given:
H-H bond: 436 kJ/mol
I-I bond: 151 kJ/mol
H-I bond: 297 kJ/mol
A. +7 kJ/mol
B. +297 kJ/mol
C. -290 kJ/mol
D. -7 kJ/mol
Energy change is the conversion of the energy stored in reactants to products. In the reaction between hydrogen and iodine, the energy change is -7 kJ/mol. Thus, option D is correct.
What is total energy change?Total energy change is the conversion of the energy from a substance to another when the reactant undergoes modification to produce a product.
The reaction is given as,
H₂ + I₂ → 2HI
In the reaction, the bonds between H-H and I-I are broken to release energy that produces two H-I bonds as the product.
Given,
H-H bond = 436 kJ/mol
I-I bond = 151 kJ/mol
H-I bond = 297 kJ/mol
So, 436 kJ/mol + 151 kJ/mol - 2x297 kJ/mol = -7 kJ/mol
Therefore, -7 kJ/mol is the total energy change in the reaction involving hydrogen and iodine.
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Which is one way that waves erode coastlines?
Answer:
Four main processes erode the destructive waves; hydraulic action, compression, abrasion and attrition. Hydraulic Action is the sheer force of water crashing off the coastline causing the material to dislodge and be carried away by the sea.
Answer:
a
Explanation:
calculate the ph and poh of a 0.0032 M solution of nitric acid NHO3
Answer:
HNO3 ->NO3²- + H+
Concentration of H+ ions= 0.0032M
pH = - log[ H+]
= - log (0.0032)
= 2.49
pH + pOH = 14
pOH = 14 - pH
= 14 - 2.49
= 11.51
pH = 2.49 and pOH = 11.51
Hope this helps.
I NEED HELP PLEASE, THANKS! :)
The density of water at 4.00°C is 0.967 g/mL. How many molecules of water are present in a 499.8 mL bottle of water? Express your answer to the correct number of significant figures.
Answer:
[tex]\large \boxed{1.615 \times 10^{25}\text{ molecules water}}[/tex]
Explanation:
You must calculate the mass of the water, convert it to moles, and then calculate the number of molecules.
1. Mass of water
[tex]\text{Mass } = \text{499.8 mL} \times \dfrac{\text{0.967 g}}{\text{1 mL}} = \text{483.3 g}[/tex]
2. Moles of water
[tex]\text{Moles of water} = \text{483.3 g water} \times \dfrac{\text{1 mol water}}{\text{18.02 g water}} = \text{26.82 mol water}[/tex]
3. Molecules of water
[tex]\text{No. of molecules} = \text{26.82 mol water} \times \dfrac{6.022 \times 10^{23}\text{ molecules water}}{\text{1 mol water}}\\\\= \mathbf{1.615 \times 10^{25}}\textbf{ molecules water}\\\text{The sample contains $\large \boxed{\mathbf{1.615 \times 10^{25}}\textbf{ molecules water}}$}[/tex]
The number of molecules of water present in the bottle is 1.62×10²⁵ molecules.
We'll begin by calculating the mass of the water in the bottle.
Density of water = 0.967 g/mLVolume of water = 499.8 mLMass of water =?Mass = Density × Volume
Mass of water = 0.967 × 499.8
Mass of water = 483.3066 g
Finally, we shall determine number of molecules of water in the bottle.
From Avogadro's hypothesis,
1 mole of water = 6.02×10²³ molecules
But,
1 mole of water = 18 g
Thus, we can say that:
18 g of water = 6.02×10²³ molecules
Therefore,
483.3066 g of water = (483.3066 × 6.02×10²³) / 18
483.3066 g of water = 1.62×10²⁵ molecules
Thus, the number of molecules of water in the bottle is 1.62×10²⁵ molecules.
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Why you cannot add 0.3 moles of calcium fluoride directly to 1L of water to make a 0.3 M
solution ?
need help ASAP!
Answer:
Because it's not soluble in water, need to be heated acidic solution
Explanation:
Calcium Fluoride Formula: CaF2 Comprises of Ca2+ and F−
H2O = Water H+ O2- OH-
Insoluble in water
In order to dissolve a salt, you have to break apart the ions and hydrate them via a solvent.
Need to read
HSAB concept( Pearson acid-base concept) is an initialism for "hard and soft (Lewis) acids and bases"
So F- is a Halogen which is a Hard Base
And OH- is a Hard base as well
And H- is a soft base
So soft acids react best with soft bases and hard acids react best with hard bases.
Bases don't react with other bases.
When an F atom becomes an F-ion, the Fatom
gains a proton
gains an electron
loses an electron
loses a proton
When an F atom becomes an F-ion, the F atom gains an electron.
An atom is the smallest indivisible particle of an element. An atom consists of proton, electron and neutron, which are called subatomic particles. An atom becomes charged when it loses or gains an electron. The charged atom is called an ion. An atom loses electrons to become positively charged i.e. a cation while it gains electrons to become negatively charged i.e. an anion. Therefore, when an F atom becomes an F-ion, this means that the F atom gains an electron.Learn more at: https://brainly.com/question/13495616?referrer=searchResults
The Fluoride ion given has a -ve charge onto it. Thus in order to become stable Fluorine gains an electron. Thus option b is correct.
The elements in the periodic table try to attain the stable noble gas configuration in the order to become stable. The noble gas configuration has the elements to be less reactive.
When the atom loses an electron in order to become more stable, a +ve charge has been implemented onto the ion.
When the atom gains an electron to become stable, a -ve charge has been added to the ion.
The Fluoride ion given has a -ve charge onto it. Thus in order to become stable Fluorine gains an electron. Thus option b is correct.
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In a science experiment, 10 tomato plants were given fertilizer in their water each week and 10 tomato plants were given plain water each week. All other factors were the same for all plants. At the end of each week, the height of each plant was measured. What was the independent and dependent in the experiment?
1. the height of the plant
2. the amount of water given
3. the type of plant
4. whether or not there was fertilizer in the water
Answer:
Independent: whether or not there was fertilizer in water
Dependent: height of plants
Explanation:
In an experiment, there is an independent and a dependent variable. The independent variable is what is changed in the experiment. The dependent variable is what is measured.
In this experiment, 10 tomato plants are given fertilizer in the water, while 10 other tomato plants are given regular water. Everything else is kept constant, and the heights are measured at the end of the week.
The independent variable is what is being changed. In this experiment, the only thing being manipulated is the fertilizer. One group of the plants is given fertilizer, while the other is not. Therefore, the independent variable is whether or not there was fertilizer in the water.
The dependent variable is what is being measured. In this experiment, the thing that is being measured is the height of the plants. Therefore, the dependent variable is the height of the plants.
Please can someone help I will mark brainiest!
Answer:
2Cl- ⇒ Cl ↓2+ 2e
Explanation: sorry if this is not what you were looking for.
What is the yield of uranium from 2.50 kg U3O8?
Answer: Thus the yield of uranium from 2.50 kg [tex]U_3O_8[/tex] is 2.12 kg
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number [tex](6.023\times 10^{23})[/tex] of particles.
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{molar mass}}[/tex]
moles of [tex]U_3O_8=\frac{2.50\times 1000g}{842g/mol}=2.97mol[/tex] (1kg=1000g)
As 1 mole of [tex]U_3O_8[/tex] contains = 3 moles of U
2.97 mole of [tex]U_3O_8[/tex] contains = [tex]\frac{3}{1}\times 2.97=8.91moles[/tex] moles of U
Mass of Uranium=[tex]moles\times {\text {Molar mass}}=8.91mol\times 238g/mol=2120g=2.12kg[/tex]
( 1kg=1000g)
Thus the yield of uranium from 2.50 kg [tex]U_3O_8[/tex] is 2.12 kg
Strontium, a group 2 element with an electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 , will form a _____ ion in a chemical bond.
+1
+2
-1
-2
Answer:
Strontium, a group 2 element with an electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² , will form a +2 ion in a chemical bond.
Explanation:
An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.
So an ion is an atom or group of atoms that have an electric charge. A cation is an ion that has a positive charge.
The alkali metals in the earth (Elements IIA) lose two electrons to form a 2+ cation. Strontium is an alkali metal that loses the two electrons belonging to 5s², forming the +2 ion.
Answer:
+2
Explanation:
If the temperature outside is 297 what is this temperature in degrees celsius
Answer:
147.222
Explanation:
It's a simple conversion.
Which balanced equation represents an oxidation-reduction reaction?
Answer:
Oxidation states are used in chemistry solutions. It is a bond in which electron transfers easily from one nucleus to another nucleus.
Explanation:
Oxidation-reduction reactions have some rules.The oxidation state is 0 at an uncombined bond.The bond of oxidation reduction is +1 in alkeli metal. The bond in two metal is +2The oxidation reduction state at helogens is -1. It does not happened always.The oxygen bond in oxidation and reduction is -2. The sum of the oxidation state is equal to the compound charges.In this process the changes occur for any elements. Redox could be occur. Its oxidized and reduction reaction can be seen in this process.And ironic bonds what happens to electrons? No
Answer:
metals donate electrons to nonsmetals
The forces between water molecules are stronger
than the forces between ethanol molecules. Which
liquid would probably be most difficult for an insect
to walk on? Explain your answer.
Answer:
An insect would have an easier time walking on the surface of water than on the surface of ethanol.
Water's stronger intermolecular forces lead to higher surface tension.
Higher surface tension allows water to support the insect.
Answer:
An insect would have an easier time walking on the surface of water than on the surface of ethanol.
Water's stronger intermolecular forces lead to higher surface tension.
Higher surface tension allows water to support the insect.
Explanation:
What is the mole ratio between NH3 and H2O in the following reaction:
4NH3(g)+ 6NO(g)----->5N2(g) +6H2O(l)
Answer:
1 mole of nitrogen (N2) reacts with 3 moles of hydrogen (H2) to form 2 moles of ammonia (NH3) ... 4 NH3 (g) + 5 O2 (g) --> 4 NO (g) + 6 H2O (g) ... Example: What is the molar ratio between Li and N2 in the following reaction
Explanation:
1 mole of nitrogen (N2) reacts with 3 moles of hydrogen (H2) to form 2 moles of ammonia (NH3) ... 4 NH3 (g) + 5 O2 (g) --> 4 NO (g) + 6 H2O (g) ... Example: What is the molar ratio between Li and N2 in the following reaction
What is the temperture at which all molecular movements stop called
Answer:
Absolute Zero
Explanation:
at 0 Kelvin, nothing can move and entropy reaches 0
Answer:
absolute zero
Explanation:
which substance will form a solution when mixed with liquid benzene (c6h6)
Answer: [tex]I_{2} (l)[/tex]
Explanation: Because C 6 H 6 is nonpolar substance and I 2 is also nonpolar compound
According to the concept of solubility,iodine will form a solution when mixed with liquid benzene as both are non-polar substances.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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