This chicken tastes good
Which combination of variables will make an experiment the most reliable? A. Once controlled variable and many experimental variables. B. Two controlled variables C. Two experimental Variables D. One dependent variable and one experimental variable
Answer:
D. One dependent variable and one experimental variable
Explanation:
The experimental variable is defined as an independent variable which can be manipulated during an experiment in order to find out its impact or influence on the dependent variable.
The dependent variable refers to a variable that changes when an experimental or independent variable is manipulated.
Every experiment must have at least one experimental variable and one dependent variable in order to yield any meaningful result.
How can you find the amount of valence electrons an atom of an element contains?
Answer:
For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.
Explanation:
why is polarity an important factor when determining how molecules interact?
Answer:
Water's polarity allows it to dissolve other polar substances very easily. When a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa.
Explanation:
Answer/Explanation:
When a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa. Because molecular polarity results from the VECTOR sum of the individual bond dipoles. Water's polarity allows it to dissolve other polar substances very easily.
A __________ cycle describes the movement of any chemical element or chemical compound that cycles through the biosphere and plays a role in its stability, as well as cycling through other Earth reservoirs.
The description of the movement of any chemical element that cycles through the biosphere and plays a role in it's stability,as well as cycling through other earth reservoirs is a Biogeochemical cycle.
Base your answer on the information below. The hydrocarbon 2-methylpropane reacts with iodine as represented by the balanced equation below. At standard pressure, the boiling point of 2-methylpropane is lower than the boiling point of 2-iodo-2-methylpropane. Explain the difference in the boiling points of 2-methylpropane and 2-iodo-2-methylpropane in terms of both molecular polarity and intermolecular forces.
Answer:
See explanation
Explanation:
The boiling point of a substance is affected by the nature of bonding in the molecule as well as the nature of intermolecular forces between molecules of the substance.
2-methylpropane has only pure covalent and nonpolar C-C and C-H bonds. As a result of this, the molecule is nonpolar and the only intermolecular forces present are weak dispersion forces. Therefore, 2-methylpropane has a very low boiling point.
As for 2-iodo-2-methylpropane, there is a polar C-I bond. This now implies that the intermolecular forces present are both dispersion forces and dipole interaction. As a result of the presence of stronger dipole interaction between 2-iodo-2-methylpropane molecules, the compound has a higher boiling point than 2-methylpropane.
Which type of reaction is always spontaneous?
A. an exothermic reaction that has an increase in disorder
B. an exothermic reaction that has a decrease in disorder
C. an endothermic reaction that has an increase in disorder
D. an endothermic reaction that has a decrease in disorder
Answer:
A.) an exothermic reaction that has an increase in disorder.
Explanation:
got it correct (unit review test)
17.Oxygen gas can be prepared by heating potassium chlorate according to the following equation:
2KClO3(s)2KCl(s) + 3O2(g)
The product gas, O2, is collected over water at a temperature of 25 °C and a pressure of 755 mm Hg. If the wet O2 gas formed occupies a volume of 6.22 L, the number of grams of O2 formed is ________
g. The vapor pressure of water is 23.8 mm Hg at 25 °C.
Mass of O₂ formed = 7.84 g
Further explanationGiven
Reaction
2KClO₃(s) ⇒2KCl(s) + 3O₂(g)
P water = 23.8 mmHg
P tot = 755 mmHg
V = 6.22 L
T = 25 + 273 = 298 K
Required
mass of O₂
Solution
P tot = P O₂ + P water
P O₂ = P tot - P water
P O₂ = 755 - 23.8
P O₂ = 731.2mmHg = 0.962 atm
Moles O₂ :
Ideal gas law :
n = PV/RT
n = 0.962 x 6.22 / 0.082 x 298
n = 0.245
Mass O₂ :
= mol x MW
= 0.245 x 32
= 7.84 g
thin layer that has two layer called oceanic and continental. is it mantle, core, atmosphere or crust?
Crust it is literally called the continental crust
A 10 wheeler truck collides with a car. Who is more likely to be hurt: the driver of the car or the driver of the truck? please justify your answer.
THANK YOU ت︎
Answer:
The driver in the car because a truck is a bigger vehicle and the impact of a truck to a car is more damaging than a car to a truck. Weight difference is the key I think.
Explanation:
what are the 3 receptors
Answer:
Where’s the image?
Explanation:
PLEASE HELP! this is the last section and I cant figure it out. any assistance would be greatly appreciated
Reaction of galvanic cell
Further explanationGiven
Redox reaction between Zn and Mg
Required
Half reaction
Potential of the cell
Solution
Zn²⁺ + 2e -> Zn E ° = -0.76 V
Mg²⁺ + 2e -> Mg E ° = - 2.37 V
The higher E ° of the cell will act as the positive pole/cathode
Electrode Zn as a cathode (reduction) and Mg as an anode (oxidation) (E ° of Zn cells is greater than Mg)
Half reaction
Cathode: Zn²⁺ + 2e ⇒ Zn E ° = -0.76 V
Anode: Mg ⇒ Mg²⁺ + 2e E ° = +2.37 V
------------------------------------------------- ----------- +
Cell reaction: Zn²⁺ + Mg ---> Zn + Mg²⁺ E ° cell = +1.61 V
The reaction occurs spontaneously in the absence of an electric current, thus including galvanic cells/voltaic cells
What is the volume of 1.8 moles of O2?
Answer:
33.6 i think
Explanation:
Gaseous phosphorus pentachloride decomposes to gaseous phosphorus trichloride and chlorine at a temperature where K= 1.0x10^-3 mol/L. Suppose 2.0 mole of phosphorus pentachloride in a 2.0-L vessel is allowed to come to equilibrium. Calculate the equilibrium concentrations of all species.
Answer:
[PCl₃] = 0.031M
[Cl₂] = 0.031M
[PCl₅] = 0.969M
Explanation:
Based on the reaction:
PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)
Keq is defined as:
Keq = 1.0x10⁻³ = [PCl₃] [Cl₂] / [PCl₅]
Where [] are equilibrium concentrations of each species
Inital [PCl₅] = 2.0mol / 2.0L = 1M.
In equilibrium:
[PCl₃] = X
[Cl₂] = X
[PCl₅] = 1M-X
Where X is reaction coordinate
Solving for X in Keq:
1.0x10⁻³ = [X] [X] / [1-X]
1.0x10⁻³ - 1.0x10⁻³X = X²
1.0x10⁻³ - 1.0x10⁻³X - X² = 0
X:
X = -0.032M. False solution, there is no negative concentration
X = 0.031M
That means equlibrium concentrations are:
[PCl₃] = 0.031M
[Cl₂] = 0.031M
[PCl₅] = 1-0.031M = 0.969M
[PCl₃] = 0.031M[Cl₂] = 0.031M[PCl₅] = 0.969M1. what is the pressure in space equal to?
2. what is the pressure in kPa at sea level?
3. a 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. Calculate the specific heat capacity of iron.
4. how many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?
Answer:
1. The pressure in outer space is so low that many consider it as non-existant. It has a pressure of 1.322 × 10−11 Pa. Pressure may be detected from the molecule of air or water hitting you. Since there is very little air and hardly ever water hitting you in space, pressure is almost zero or negligible.
2. Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.
3. 0.46J/gC
explanation.The specific heat capacity of a material is given by:
C_s = \frac{Q}{m \Delta T}C s = mΔTQ
where
Q is the amount of heat absorbedm is the mass
\Delta TΔT is the variation of temperature
For the piece of iron in the problem:
m = 15.75 gm=15.75g
Q=1086.75 JQ=1086.75J
\Delta T=175 C-25 C=150^{\circ}ΔT=175C−25C=150∘
Substituting into the equation,
C_s = \frac{1086.75 J}{(15.75 g)(150^{\circ}C)}=0.46 J/gCC s = (15.75g)(150 ∘ C)1086.75J = 0.46J/gC
4. 207 J
Explanation:
The key to this problem lies with aluminium's specific heat, which as you know tells you how much heat is needed in order to increase the temperature of 1 g of a given substance by 1∘C.
#I hope it's help
Convert 2.4 X 10^28 Molecules of H3PO4 into Grams.
Answer:
3906966 g
Explanation:
The number of molecules contained in a substance is given by the formula:
number of molecules = number of mole * Avogadro constant.
Given that:
number of molecules = 2.4 * 10²⁸ molecules, Avogadro constant = 6.02 * 10²³ mol⁻¹.
Substituting gives:
2.4 * 10²⁸ molecules = number of moles * 6.02 * 10²³ mol⁻¹
number of moles = 2.4 * 10²⁸ molecules / 6.02 * 10²³ mol⁻¹
number of moles = 39867 moles
The molar mass of H₃PO₄ = (1 * 3) + (31 * 1) + (16 * 4) = 98 g/mol
Hence:
mass of H₃PO₄ = molar mass of H₃PO₄ * number of moles
mass of H₃PO₄ = 98 g/mol * 39867 moles
mass of H₃PO₄ = 3906966 g
The wastewater produced by offices is called __
Answer:
sullage or grey water
Explanation:
sources include: sinks, showers, baths, washing machines, dishwashers and no not toliets.
What are two ways to describe concentration? How do they differ from one another?
Answer:
no .........................
what is the percent chance that the offspring will be dwarf plants with yellow fruit
Answer:
Yellow fruit and dwarf vines are recessive traits in tomatoes. Red fruit and tall vines are dominant. Complete a Punnett square and answer the questions for a completely dominant red and tall plant crossed with a heterozygous red and dwarf plant.
Explanation:
Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass. What is the molar concentration of arsenic in a water sample that has 1 ppm arsenic (As)
Answer:
The molar concentration of water sample that has 1 ppm arsenic is 1.33 * 10⁻⁵ M
Explanation:
1 parts per million (ppm) means 1 part of solute in a million parts of solution.
Since 1 million, 10⁶ mg = 1 kg, 1 ppm = 1 mg/kg
The density of water = 1.0 kg/L, therefore, the volume of 1 kg of water = 1 L
Hence, 1 ppm = 1 mg/kg = 1 mg/L
molar mass of arsenic = 75 g/mol
1 mg of arsenic = 10⁻³ g or 0.001 g
number of moles of arsenic in 0.001 g of arsenic = 0.001 g / 75 g/mol = 1.33 * 10⁻⁵ moles
Molar concentration = 1.33 * 10⁻⁵ mol / 1 L = 1.33 * 10⁻⁵ M
Therefore, the molar concentration of water sample that has 1 ppm arsenic is 1.33 * 10⁻⁵ M
There are only seven base units of the metric system.
Which of the below is NOT a base unit of the metric system.
A. K for temperature
B. kg for mass
C. V for volume
D. s for time
Explanation:
V is not an SI base unit. (C)
Volume can be expressed as m³ in units.
In turn, m is the SI base units for length.
2. All elements are composed of extremely small particles called
Answer:
Atoms
Explanation:
Willie pushed on the cart with 1000 newtons of force. James pulled
on a rope attached
to the cart with 500 newtons of force. Piff pushed on the cart with 400
newtons. What will happen to the cart and why?
Answer:
Sxr
Explanation:
Rtxrcrctvucy
Which acid-base imbalance results in excretion of carbon dioxide by the lungs in a compensatory attempt to raise pH levels
Answer:
The acid base imbalance would be metabolic acidosis.
Explanation:
Metabolic acidosis is a systemic failure that can occur from various causes, from an uncompensated diabetic with an excess of ketone bodies in the blood, to poisoning with CO2.
This is regulated and compensated by the respiratory system that seeks to eliminate CO2 through the respiratory tract in order to increase the alkalinity of the blood.
This system is highly accompanied by renal aid that is responsible for excreting acid metabolites and retaining fluids for the dissolution of acidosis.
On the other hand, in patients who suffer from this systemic failure, it will be noticed as a very characteristic symptom of hypercapnia and hyperventilation, since the respiratory system is in charge of increasing the frequency to quickly decrease this acidosis and that the low blood pH do not denature the proteins critical to vital signs.
In the reaction of solid copper with silver nitrate, solid silver and copper (II) nitrate form. How many grams of solid silver will form if 24.58 g of solid copper are used?
Answer:
83.4g
Explanation:
The reaction expression is given as:
Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
Mass of copper = 24.58g
Unknown:
Mass of silver produced = ?
Solution:
To solve this problem, let us find the number of moles of the copper;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Cu = 63.6g/mol
Number of moles = [tex]\frac{24.58}{63.6}[/tex] = 0.39mole
1 mole of Cu will produce 2 moles of Ag
0.39 mole of Cu will produce 0.39 x 2 = 0.77moles of Ag
Mass of Ag = number of moles x molar mass = 0.77 x 107.9 = 83.4g
what type of reaction is Au2S+H2---> 2Au+H2S
Answer:
single replacement reaction is type of reaction is Au2S+H2---> 2Au+H2S.
What is the completed balanced reaction for the replacement Al×H2SO4
Answer:
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)
Explanation:
Let's consider the unbalanced equation for the single replacement reaction between Al and H₂SO₄.
Al(s) + H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
We will begin balancing S atoms by multiplying H₂SO₄ by 3.
Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
Then, we balance Al atoms by multiplying Al by 2.
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
Finally, we get the balanced equation by multiplying H₂ by 3.
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)
HELP!!!
How many grams of tomatoes are equivalent to 1.30 pounds of tomatoes? (1 lb = 453.6 g)
If you can please show me how you solved it. Please and Thank you
Answer: with dog figs- it is 590
With decimals it is 589.68
Explanation:
Perform the following operation
and express the answer in
scientific notation.
3.4000x 10-6 +5.7000x 10-3
Explanation:
3.4000x 10-6 +5.7000x 10-3
[tex]3.4000 \times {10}^{ - 6} = 3.4 \times {10}^{ - 6} [/tex]
[tex]5.7000 \times {10}^{ - 3} = 5700 \times {10}^{ - 6} [/tex]
now we can add them
[tex]3.4 + 5700 = 5703.4 \\ = 5703.4 \times {10}^{ - 6} [/tex]
[tex] = 5.7034 \times {10}^{ - 3} [/tex]
What is the product of the unbalanced combustion reaction below?
Answer: A
Explanation:
Answer:
C
Explanation:
because the combustion reaction produce vapor water and CO2
what is the experiment to find the concentration
A titration is an experiment where a volume of a solution of known concentration is added to a volume of another solution in order to determine its concentration. Many titrations are acid-base neutralization reactions, though other types of titrations can also be performed.Aug 12,