Answer:
The answer is 22 degrees celsius. which is D.
Explanation:
Hot:84-99 F (29-37.5 C) Warm:70-84 F (21-29 C) Cool:55-69 F (13-21 C) Cold: Below 55 F (Below 13 C)
Answer: 22
Explanation: UsaTestPrep
Please Help.What is a solvent? A substance that is dissolved. A) The paper that is placed in the liquid. B) A part of the chromatography apparatus. C) A substance, usually liquid, that can dissolve other substance.
Answer:
C is the answer.
Explanation:
A solvent is a substance that becomes a solution by dissolving a solid, liquid, or gaseous solute. A solvent is usually a liquid, but can also be a solid or gas. The most common solvent in everyday life is water. Most other commonly-used solvents are organic (carbon-containing) chemicals.
How much time would it take for 336 mg of copper to be plated at a current of 5.6 A ? Express your answer using two significant figures.
Answer:
1.8 × 10² s
Explanation:
Let's consider the reduction that occurs upon the electroplating of copper.
Cu²⁺(aq) + 2 e⁻ ⇒ Cu(s)
We will establish the following relationships:
1 g = 1,000 mgThe molar mass of Cu is 63.55 g/molWhen 1 mole of Cu is deposited, 2 moles of electrons circulate.The charge of 1 mole of electrons is 96,486 C (Faraday's constant).1 A = 1 C/sThe time that it would take for 336 mg of copper to be plated at a current of 5.6 A is:
[tex]336mgCu \times \frac{1gCu}{1,000mgCu} \times \frac{1molCu}{63.55gCu} \times \frac{2mole^{-} }{1molCu} \times \frac{94,486C}{1mole^{-}} \times \frac{1s}{5.6C} = 1.8 \times 10^{2} s[/tex]
An aqueous KNO3 solution is made using 75.1 g of KNO3 diluted to a total solution volume of 1.95 L .Calculate the molarity of the solution. (assume a density of 1.05 g/mL for the solution)
Calculate the molality of the solution.
Calculate the mass percent of the solution.
Answer:
- [tex]M=0.38M[/tex]
- [tex]\\ \% m=3.67\%[/tex]
Explanation:
Hello,
In this case, since the molar mass of potassium nitrate is 101.1 g/mol, we can compute the molarity as follows:
[tex]M=\frac{75.1g*\frac{1mol}{101.1g} }{1.95L} \\\\M=0.38M[/tex]
Moreover, as the mass percent is computed as:
[tex]\% m=\frac{m_{KNO_3}}{m_{solution}} *100\%[/tex]
Thus, by using the given density of the solution, we obtain:
[tex]\% m=\frac{75.1g}{1.95L*\frac{1000mL}{1L}*\frac{1.05g}{1mL} } *100\%\\\\ \% m=3.67\%[/tex]
Regards.
Several groups of students are attempting to determine the density of a lead weight by various methods. Their data is shown in
the table. A handbook lists the density of lead as 11.3 g/mL.
Group 1
Group 2
Group 3
Measured density (g/mL), trial 1
11.5
11.5
10.9
Measured density (g/mL), trial 2
11.3
11.4
11.3
Measured density (g/mL), trial 3
11.1
11.4
11.1
Average density (g/mL)
11.3
11.4
11.1
Which group was most accurate?
Which group was most precise?
O Group 2
O Group 3
O Group 1
O Group 3
O Group 2
O Group 1
Answer:
accurate: Group 1precise: Group 2Explanation:
Accuracy is a measure of how close a measured value is to the true value. Here, we assume the handbook value (11.3) to be the true value. Group 1 arrived at this number, so must be considered to have made the most accurate measurement.
__
Usually, precision refers to the value of the least significant digit of the measurement. Here, all measurements were made to 3 significant digits, with the least digit being tenths. On that basis, no group can claim better precision than any other.
Another way to consider precision is to look at the variation in measured values. Group 2's values were the most consistent, having a range of 0.1 g/mL. Group 1's values had a range of 0.4 g/mL (from 11.1 to 11.5), and Group 3's values also ranged over 0.4 g/mL (from 10.9 to 11.3).
Because Group 2 had the most consistent readings, we award them the title of most precise.
Answer:
accurate: Group 1
precise: Group 2
Explanation:
Accuracy is a measure of how close a measured value is to the true value. Here, we assume the handbook value (11.3) to be the true value. Group 1 arrived at this number, so must be considered to have made the most accurate measurement.
Why was 1990 an important year regarding air quality?
O The United States took first steps to keep the air clean.
O The United States created the Environmental Protection Agency.
Modifications and improvements were made to the Clean Air Act.
O Funding was established under the Clean Air Act to study air pollution.
Answer:
C. Modifications and improvements were made to the Clean Air Act.
Explanation:
The Clean Air act was originally established in 1970 and was concerned with the aim of protecting people and the environment in general from polluted air. Polluted air could cause different illnesses and environmental degradation.
The law was amended in 1990 in which modifications and improvements were made to the Clean Air Act. There was the need to reduce acid rain, toxic emissions which could deplete the ozone layer and cause varying respiratory illnesses in humans and to increase visibility.
1990 was an important year to to the United States regarding Air Quality because "Modifications and improvements were made to the Clean Air Act." (Option C)
How is this so?In reality, 1990 was an important year for air quality due to the enactment of significant amendments to the Clean Air Act in the United States.
These amendments, signed into law in November 1990, introduced stricter regulations and requirements to combat air pollution.
The amendments addressed various pollutants, including sulfur dioxide, nitrogen oxides, and hazardous air pollutants, leading to improved air quality standards and a more comprehensive approach to protecting human health and the environment from the harmful effects of air pollution.
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What happens if you rub a balloon against wool and put it against water dripping from a cup
Answer:
The water bends due to the static electricity on the balloon.
Explanation:
The static electricity you built up by rubbing it against the balloon attracts the stream of water, bending it towards the comb or balloon like magic!
Negatively charged particles called electrons jump the wool to the balloon as they rub together, the comb now has extra electrons and is negatively charged. The water features both positive and negatively charged particles and is neutral. Positive and negative charges are attracted to each other so when you move the negatively charged balloon towards the stream, it attracts the water's positively charged particles and the stream bends!
The energy of a photon is ________ proportional to its wavelength. The energy of a photon is ________ proportional to its frequency.
Answer: Inversely , Directly
Explanation:
The energy of a photon is inversely proportional to its wavelength and directly proportional to its frequency.
As can be seen from this equation;
E = hv = h c / ∧
Where E = Energy of a photon
v = Frequency
h = Planck Constant
c = speed of light
∧ = Wave length
A certain chemical reaction releases 15.6/kJg of heat for each gram of reactant consumed. How can you calculate the heat produced by the consumption of 1.5kg of reactant? the math up. But don't do any of it. Just leave your answer as a math expression.
Answer:
The chemical reaction releases 23400 kilojoules due to 1.5 kg-reactant.
Explanation:
Given the amount of energy released due to reactant consumption, total energy ([tex]Q[/tex]), measured in kilojoules, is determined by the following expression:
[tex]Q = m\cdot L[/tex]
Where:
[tex]m[/tex] - Mass of reactant, measured in kilograms.
[tex]L[/tex] - Released heat ratio, measured in kilojoules per gram.
Given that [tex]m = 1500\,g[/tex] and [tex]L = 15.6\,\frac{kJ}{g}[/tex], the total energy released by chemical reaction is:
[tex]Q =(1500\,g)\cdot \left(15.6\,\frac{kJ}{g} \right)[/tex]
[tex]Q = 23400\,kJ[/tex]
The chemical reaction releases 23400 kilojoules due to 1.5 kg-reactant.
What is the order of increasing rate of eusion for the following gases, Ar, CO2, H2, N2?
A. CO2
B. Ar
C. CO2
D. N2
E. Ar
Answer:
H2 > N2 > Ar > CO2
Explanation:
Graham's law explains why some gases efuse faster than others. This is due to the difference i their molar mass. Generally; The rate of effusion of gaseous substances is inversely proportional to the square rot of its molar mass.
This means gases with low molar masses would have higher efusion rate compared to gases with higher molar masses.
So now we just need to compare the molar masses of the various gases;
Ar - 39.95
CO2 - 44.01
H2 - 2
N2 - 28.01
To obtain the order in increasing rate, we have to order the gases in decreasing molar mass. This order of increasing rate is given as;
H2 > N2 > Ar > CO2
5. What is the density of a wood block with a mass of 57 g and
a volume of 125 cm3?
Answer:
Density = 0.456 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]From the question
mass = 57 g
volume = 125 cm³
Substitute the values into the above formula and solve for the Density
That's
[tex]Density = \frac{57}{125} [/tex]We have the final answer as
Density = 0.456 g/cm³Hope this helps you
Determine what the spin state of each complex will be using the spectrochemical series along with your chemical intuition. Please explain any complexes that may be difficult to determine. You may assume any 6-coordinate complex has octahedral symmetry and any 4-coordinate complex has tetrahedral symmetry.
a. VCI3(H20)3
b. Fe(NH3)23
Answer:
A) high spin complex
B) low spin complex
Explanation:
A) VCI3(H20)3 is a high spin complex and this is because the complex has a weak field ligands all . this weak field ligands makes it impossible for pairing to take place
B) Fe(NH3)23 is a low spin complex and this is because the complex is made up of strong field ligands, this strong field ligands makes it possible for paring to take place
note : Ligands in which its donor atoms are ; Nitrogen,phosphorous or carbon are considered strong ligands
Explain why different liquids do not reach the same height in capillary tubes of the same diameter. Please choose the best explanation. a) Different liquids have different intermolecular forces. b) The stronger the intermolecular forces within the liquid, the higher the liquid rise in the capillary tube. c) Cohesive forces stronger than adhesive forces reduce the height of the liquid in the capillary tube, whereas adhesive forces stronger than cohesive forces increase the height of the liquid. d) Polar molecules climb higher than nonpolar molecules. e) The larger the dipole moment, the higher the liquid rises. f) The height of the liquids in the capillary tubes depends on the density of the liquid.
Answer:
c) Cohesive forces stronger than adhesive forces reduce the height of the liquid in the capillary tube, whereas adhesive forces stronger than cohesive forces increase the height of the liquid.
Explanation:
Two types of forces bring about capillary action.
One is cohesion, which is the intermolecular attraction between like molecules (that is, the liquid molecules). The second force, called adhesion, is an attraction between unlike molecules, such as those in a liquid and in the sides of a glass tube.
If adhesion is stronger than cohesion, the contents of the tube will be pulled upward. This process continues until the adhesive force is balanced by the weight of the liquid in the tube.
The South Pole has warm summers. True False
Answer:False
Explanation:
Kinda of a opinionated question, but unless you call -12 C warm then the answer is False
in chemistry when using electrical equipment, what should you look for?
ASAP! pls !
Answer:
Check if the equipment is in a good condition.
Check if it can cause any harmful hazards.
Check if the equipment is what you need for the experiment
Annie is touring Europe for the summer and is traveling by train from Paris, France to Brussels, Belgium. The distance between the two cities is about 195 miles. If she takes the train, which travels an average of 150.0 km/hr, how long, in hours, will the train trip take? (1 km = 0.62 mi)
Answer:
2.10 h
Explanation:
Step 1: Given data
Distance between the two cities: 195 milesAverage speed of the train: 150.0 km/hStep 2: Convert the distance between the two cities to km
We will use the relationship 1 km = 0.62 mi.
195 mi × (1 km/0.62 mi) = 315 km
Step 3: Calculate the time required for the train to travel 315 km
315 km × (1 h/150.0 km) = 2.10 h
Which of the following questions could be answered by a scientific experiment?
a. Which type of flower is the prettiest?
b. Which type of music is the most relaxing?
c. Which type of thermos keeps ice water cold the longest?
d. What is the best color to paint your bedroom?
the answer to it is C...
Answer:
C.
Explanation:
All other questions are opinion-based and can't have a definite answer.
Which substance can be described as cations bonded together by mobile electrons?a. S8(s)b. Ag(s)c. SiO2(s)d. KCl(s)e. Kr(l)
Answer:
Ag(s)
Explanation:
Metal atoms are held together by the metallic bond. The metallic bond consists of cations held together by a sea of mobile electrons.
Thus, the crystal of Ag(s) is composed of silver ions held together by a sea of mobile electrons. Electrostatic forces of attraction holds the crystal together.
The substance describing the cations bonded by mobile electrons is Ag. Thus option B is correct.
The chemical bond with the ability to exist as a cation with mobile electrons has been a metallic bond.
The metallic bond if found to be existing of central nuclei, with the sea of electrons present outside the nucleus, and has been shared by the atoms.
With the presence of the metal or metallic bond in a compound, the cation has been bonded with the mobile electrons.
The chemical bond present in the following compounds has been:
[tex]\rm a.\;S_8\;=\;Covalent\;bond\\b.\;Ag\;=\;Metallic\;bond\\\\\rm c.\;SiO_2\;=\;\rm Covalent\;bond\\\\d.\;KCl\;=\;Ionic\;bond\\\\e.\;Kr(I)\;=\;Covalent\;bond[/tex]
The substance with the presence of metallic bond has been Ag. Thus, Ag has presence of cations bonded together by mobile electrons. Thus, option B is correct.
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In the image, balls that look alike represent the same type of atom. Based on this information, what do the images below represent? A. molecules of compounds B. molecules of elements C. molecules of mixtures D. molecules of water
Answer:
B Is The Correct Answer
In the image, balls that look alike represent the same type of atom. Based on this information, the images below represent molecules of elements. Therefore, option B is correct.
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 that cannot be converted into another substance is said to be an element. Each type of atom that makes up an element is unique! According to atomic number, elements are listed in the periodic table.
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. The non-metals, such as carbon, chlorine, and oxygen, are often referred to as the elements on the right side.
Thus, option B is correct.
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A frying pan needs a Teflon coating of 1.00 mm in thickness to cover an area of 36.0 square inches. How many ounces of Teflon are needed? The density of Teflon = 0.805 g/mL
Answer:
m = 0.659 ounce
Explanation:
It is given that,
The thickness of a Teflon coating is, d = 1 mm
Area of the coating, A = 36 inch²
The density of Teflon, d = 0.805 g/mL
We need to find ounces of Teflon are needed.
Firstly, find the volume of the Teflon needed,
1 inch² = 6.4516 cm²
36 inch² = 232.258 cm²
Density,
[tex]\rho=\dfrac{m}{V}[/tex]
V is volume of the Teflon needed, V = Ad
So,
[tex]m=\rho V\\\\m=0.805\ g/cm^3\times 232.258\ cm^2 \times 0.1\ cm\\\\m=18.69\ g[/tex]
Also, 1 gram = 0.035274 ounce
18.69 gram = 0.659 ounce
So, 0.659 ounces of Teflon are needed.
Given the following balanced chemical reaction:
3A2+B2 2A3B
If 12 moles of Az are reacted with excess B2, how many moles of A3B will be produced?
Answer:
Explanation:
according to balance chemical equation
3 A2 moles produced 2 moles of A3B
so 12 moles A2 will produced moles of A3B= 12*2/3=24/3= 8
therefore 12 moles of A2 produced 8 moles of A3B
A balanced chemical reaction is an equation that has the same number of stoichiometry coefficients on both sides. When 12 moles of A₂ react, then 8 moles of A₃B are produced.
What are excess reagents?Excess reagents are the reactants that are present in more quantity than the other reactant and are left in reaction after completion.
The balanced chemical equation:
3A₂ + B₂ → 2A₃B
From reaction: 3 moles of A₂ molecule are needed to produce 2 moles of A₃B. So, 12 moles of A₂ will produce:
(12 × 2) ÷ 3 = 8 moles
Therefore, 8 moles of A₃B will be produced from 12 moles of A₂.
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Convert 0.049 kg sulfur (S) to g of sulfur (S).
Answer:
The answer is
49 g of SulphurExplanation:
To convert kilograms to grams we use the conversion
1 kg = 1000 g
From the question
If 1kg = 1000 g
Then 0.049 kg = 0.049 × 1000
We have the final answer as
49 g
Hope this helps you
=====================================
Draw all constitutional isomers with the following molecular formula. (a) C3H7Cl (b) C4H10 (c) C5H12 (d) C4H10O (e) C3H6Cl2
Answer:
See explanation
Explanation:
For this question, we must bear in mind that in the isomers what must change is the structure of the molecule but the same condensed formula must be maintained. With this in mind we can have the following options for each of the molecules given by the problem:
(a) [tex]C_3H_7Cl[/tex]
-) 1-Chloropropane
-) 2-Chloropropane
(b) [tex]C_4H_1_0[/tex]
-) butane
-) isobutane
(c) [tex]C_5H_1_2[/tex]
-) n-pentane
-) isopentane
-) neopentane
(d) [tex]C_4H_1_0O[/tex]
-) butan 1-ol
-) butan 2-ol
-) 2-methylpropan-1-ol
-) 2-methylpropan-2-ol
-) 1-methoxypropane
-) ethoxyethane
-) 2-methoxypropane
(e) [tex]C_3H_6Cl_2[/tex]
-) 1,1-dichloropropane
-) 1,2-dichloropropane
-) 1,3-dichloropropane
-) 2,2-dichloropropane
See figure 1 to further explanations
I hope it helps!
write each set in
(a) DESCRIPTION MEthod
b. ROSTER METHOD,
(c) rULE METHOD
1.whole number less than 15
2.vowels in the name figueroa
3.integers greater than -4
4.months having 30 days
5.consonants in the name Kenneth
Answer:
it is b
Explanation:
because i took the thing
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients NH3(g) + O2(g) + CH4(g) → HCN (aq) + H2O(1)
Answer:
[tex]2NH_{3 (g)} + 3O_{2 (g)} +2CH_{4 (g)} --> 2HCN_{(aq)} + 6H_{2}O_{(l)}[/tex]
Explanation:
Perform the calculation, rounding your answer to the proper number of significant figures.
0.867 +3.72 + 18.0045 =
Answer:
Hey!
0.867 + 3.72 + 18.0045 = 22.5915
Explanation:
22.5915 ROUNDED TO 2 significant figures...
2 s.f = 23
(3 s.f = 22.6)
SO ROUNDING TO 2 s.f is easier and more accurate...
ANSWER = 23 (2 s.f)
HOPE THIS HELPS!!
The calculation, rounding your answer to the proper number of significant figures would be 22.60.
0.867 +3.72 + 18.0045 =22.60
What are significant figures?
In positional notation, significant figures refer to the digits in a number that is trustworthy and required to denote the amount of something, also known as the significant digits, precision, or resolution.
As given in the problem we have to perform the calculation, by rounding the answer to the proper number of significant figures.
0.867 +3.72 + 18.0045 =22.5915
=22.59
=22.60
Thus, the calculation, rounding your answer to the proper number of significant figures would be 22.60.
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Blood is maintained at a pH of 7.4 by the primary buffers in the plasma and secondary buffers in the erythrocytes. The plasma contains carbonic acid/bicarbonate as one of its primary buffers. The pK for this buffer system is 6.3. H2CO3 → H+ + HCO3-Required:What is the ratio of bicarbonate to carbonic acid in normal blood plasma?
Answer:
74.456.6.4.7.5.3.33-6.57
Explanation:
Why at night, under the mercury or sodium vapor lights in a mall parking lot, do cars seem to be peculiar colors?3
Answer:
Because these lights work with a combination of gases that emits a yellow-orange light that reacts with the paint of cars.
Explanation:
The mercury or sodium vapor lights work with a very interesting gas structure that when reacting with each other, emit yellow-orange lights that react with the color of the cars making them appear to have other colors.
When these lights are placed in parking lots, the white cars will turn orange. This is because the white paint used in cars contains particles that emit a yellow-orange spectrum. However, cars of other colors do not have these particles and therefore become black under these lights.
an alligator is 213.4 cm long. how long is he in feet?
Answer:
7.00ft
Explanation:
How many molecules of table sugar are contained in a 2 pound bag of sugar
Answer:
1.59 × 10²⁴ molecules
Explanation:
Step 1: Convert the mass to grams
We will use the relationship 1 lb = 453.59 g.
2 lb × (453.59 g/1 lb) = 907.18 g
Step 2: Calculate the moles corresponding to 907.18 grams of sucrose (table sugar)
The molar mass of sucrose is 342.3 g/mol.
907.18 g × (1 mol/342.3 g) = 2.65 mol
Step 3: Calculate the molecules in 2.65 moles of sucrose
We will use Avogadro's number: there are 6.02 × 10²³ molecules of sucrose in 1 mole of sucrose.
2.65 mol × (6.02 × 10²³ molecules/1 mol) = 1.59 × 10²⁴ molecules
Determine the density of a 23.4g block that when placed in 25.00mL of water that causes the water to rise to a level of 28.70mL?
Answer:
Explanation:
Density is the ratio of mass to volume. The SI unit of density is kg/m³. Given that the mass of the block = 23.4 g = 0.0234 kg
The volume of block = change in water level = volume of water rise after block is placed - volume of water = 28.7 ml - 25 ml = 3.7 ml
Volume of block = 3.7 ml = 0.0037 l
1000 l = 1 m³
0.0037 l = 0.0037/1000 m³ = 3.7 × 10⁻6 m³
Density = mass / volume
Density = 0.0234 kg / 3.7 × 10⁻6 m³ = 6324 kg/m³