Answer:
.arrangement of atoms in molecules.A much larger amount of silk might be needed to produce the same effect.- Different silk strands have different combinations of amino acids. .major ampullate.goat milkFlorida has mild winters due to which system?
Answer: Predominant tropical easterly winds sweep across the central and southern portions of the state, keeping the temperatures mild
Explanation:
bc
a. What is the wavelength?
b. What is the frequency?
c. What is the wave velocity?
Answer:
Definitions
Explanation:
A: Distance between continuous crests like sound or electromagnetic waves
B: the rate something is repeated or occurs
C: Speed, velocity, direction of waves
A student heated a blue copper sulfate crystal in a test tube. After a few minutes, she observed that the crystal turned white and the inside of the test tube was covered with a thin film of water. The water inside the test tube most likely __.
Multiple choice question.
seeped through the sides of the test tube
was left from cleaning the test tube the night before
condensed from the air around the test tube
came from the blue copper sulfate crystal, which is a hydrate
The water from inside the test tube most likely came from the blue copper sulfate crystal which is a hydrated salt.
Hydrated saltsHydrated salts contain water of hydration.
A blue copper sulfate crystal contains water of hydration.
When heated, the water evaporates off to give an anhydrous salt which appears colorless.
The equation of the reaction is as follows:
CuSO4•5H2O -----> CuSO4 + 5H2O(g)
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Antimony is burned in oxygen to form antimony oxide.
4 Sb + 3 O2→ 2Sb2O3
How many moles of Sb2O3 will be formed when you have 20.0 moles of O2?
The number of mole of S₂O₃ produced from the reaction is 13.33 moles
Balanced equation
4Sb + 3O₂ —> 2S₂O₃
From the balanced equation above,
3 moles of O₂ reacted to produce 2 moles of S₂O₃
How to determine the mole of S₂O₃ producedFrom the balanced equation above,
3 moles of O₂ reacted to produce 2 moles of S₂O₃.
Therefore,
20 moles of O₂ will react to to produce = (20 × 2) / 3 = 13.33 moles of S₂O₃.
Thus, 13.33 moles of S₂O₃ were obtained from the reaction.
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How is water important in our life?
(show in numbers the minerals that we need and is found in water)
Answer:
Water plays many important roles in the body including,flushing waste from the body,regulating body temperature,transportation of nutrients and is necessary for digestion.No wonder it is considered "essential"!.Plain water is the best choice for hydrating the body.
Explanation:
hope it helps you><
A. How many significant figures in the following?
4.80 x 10^6 =
Answer:
Number of Significant Figures: 3
The Significant Figures are 4 8 0
Calcium is a group 2 element. Chlorine is a group 7 element. They form an ionic compound called calcium chloride. In calcium chloride, for every one atom of calcium, how many atoms of chlorine will there be?
Answer:
2 ........... cuz CaCl2
balance the following chemical equation by providing the correct coefficients fe+h2so4 fe(so4)3 + h2
help me please
Answer:
2Fe + 3H2SO4 + Fe2(SO4)3+ 3H2
Explanation:
1. Fe (SO4) 3 is an incorrectly written formula because iron is trivalent as we can see by this three ahead of SO4. SO4 is divalent always.
2. since (SO4) is 3, this three shows us that there must be 3 in the reactants as well.
so now there is 3H2SO4
3. Since we have added 3 to one hydrogen we must add another. So now it's 3H2
4. and finally iron. In Fe2 (SO4) 3 we see this 2 in front of Fe which means it goes 2Fe.
help me please ┐(‘～`;)┌
Answer: (2)react completely in the reaction
limiting reactant determines the number of moles in a chemical reaction
excess reactant is the reactant with an excess number of moles
The half of the moon facing the sun is always lit, but the different phases happen because: Question 4 options: the Earth moves to different positions around the Sun we only see parts of the lit side as the moon goes around the Earth only part of the light gets reflected to Earth the spinning of the moon lets us see different amounts of light.
Moon is the natural satellite of the Earth and the other planets that orbits them. Different phases happen because only parts of the lit side are visible.
What are the phases of the moon?The moon is the natural satellite of the earth and orbits the planet because of which the various phases of the moon are observed from the planet. The sun is the source of the energy and light that gets absorbed and reflected by the moon and stars.
When the moon orbits the planet then only some of its portion is lit and reflected to the viewers. The phases like Crescent, Quarter, Full and new moon are seen.
Therefore, option B. parts of the lit side are only visible.
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Which use of pomace has become more available through new technologies?
A) animal feed
B) soil additives
C) landscaping mulch
D) food flavorings
Food flavorings as use of pomace has become more available through new technologies
What is a pomace?This simply refers to a dry residue of a particular material from which a liquid is extracted. However, it is highly rich in nutrients such as:
Ursolic acidMineralsDietary fiberAntioxidants and many more...So therefore, food flavorings as use of pomace has become more available through new technologies
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A balloon that had a volume of 3. 50 L at 25. 0°C is placed in a hot room at 40. 0°C. If the pressure remains constant at 1. 00 atm, what is the new volume of the balloon in the hot room?.
PLEASE HELP ME WITH THIS QUESTION THIS FREAKING SUCKS
A student dissolves 0.250 mol NaC1 in 2.05 kg H20. What is molality of the resulting solution? Show your work.
Answer:
m = 0.122 m
Explanation:
Molality(m): A measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.
[tex]\mathrm{Molality\:Formula}:\quad \mathrm m = \dfrac{ mole\:of\:solute }{ mass\:of\:solvent\:in\:kg }[/tex]
[tex]\mathrm m = \dfrac{ mole}{ kg }[/tex]
[tex]\mathrm{Substitute\:the\:numbers\:into\:the\:"Molality\:Formula"}[/tex]
[tex]\mathrm m = \dfrac{ 0.250 }{ 2.05 }[/tex]
[tex]\mathrm{Divide\:0.250\:by\:2.05\:and\:get\:0.12195122}[/tex]
[tex]\mathrm m = {0.12195122}[/tex]
[tex]\mathrm{Round\:to\:the\:nearest\:thousandths\:place}[/tex]
[tex]\mathrm m = 0.122[/tex]
Answer:
To calculate the molality of the resulting solution, we need to use the formula:
Molality (m) = moles of solute / mass of solvent (in kg)
Given:
Number of moles of NaCl (solute) = 0.250 mol
Mass of H2O (solvent) = 2.05 kg
Step 1: Convert the mass of the solvent from grams to kilograms:
Mass of H2O = 2.05 kg
Step 2: Calculate the molality using the formula:
Molality (m) = moles of solute / mass of solvent (in kg)
Molality = 0.250 mol / 2.05 kg
Molality = 0.122 mol/kg
Therefore, the molality of the resulting solution is 0.122 mol/kg.
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If you are given 12M HCL how would you make a 6M of 100mL? SHow the math and explain the process
dilution
V₁M₁=V₂M₂
V₁.12 = 100.6
V₁=50 ml
Add water 50 ml to 50 ml 12 M
The overlapping of food chains results in a
the last ?
braided chain
food web
webbed chain
woven chain
The overlapping of food chains results in the last is food web
In an experiment, 200.00 grams of Al2O3 was decomposed producing 77.18 grams of Al. Calculate the percent yield for this experiment?
Answer:
Explanation:
Molecular weight of Al: 27
Molecular weight of O: 16
Percentage composition of Al by weight in Al2O3
= (27*2) / (27*2 + 16*3)
= 0.5294
In 200 grams of Al2O3, there are
= 200*0.5294
= 105.88 grams of Al
77.18 grams of Al was produced in the experiment.
Percent yield for the experiment
= product mass / reactant mass * 100%
= 77.18 / 105.88 * 100%
= 72.89%
An example of a heterogeneous mixture is
A)
soil
B)
sugar
C)
carbon dioxide
D)
carbon monoxide
A reaction is monitored and the products are found to be a salt and water. The reactant(s) must have been _____. two metal-nonmetal compounds a metal-nonmetal compound a metal and a metal-nonmetal compound an acid and a base
Answer:
D.) An acid and a base
Explanation:
One part of an acid is H+ and the other part is a negatively charged ion. One part of a base is -OH and the other part is a positively charged ion. When an acid and base react, the H+ and -OH combine to form water and the ions combine to form a salt.
The others are incorrect because they do not guarantee that water (H2O) and a salt are products.
Which line on the graph (1, 2, or 3) represents the system at dynamic equilibrium? Explain your answer.
Answer:
line 2
Explanation:
Because it's where the products and reactants meet together.
The system at dynamic equilibrium is 2.
What is dynamic equilibrium?
Rate of forward reaction is equal to the rate of backward reaction.Dynamic Equilibrium can be described because of the state of a given device wherein the reversible response taking vicinity in it stops converting the ratio of reactants and merchandise, but there may be a motion of materials between the reactants and the products.Many physical and chemical processes are reversible. A reversible system is stated to be in dynamic equilibrium while the ahead and reverse procedures arise on the same price, ensuing in no observable change within the system.
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Provided is a list of five different substances. How many of these substances are elements?.
Answer:
118
Explanation:
Of these 118 elements, 94 occur naturally on Earth. Six of these occur in extreme trace quantities: technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.
Why doesn't the United States embrace nuclear energy?.
Answer: Advantages and Challenges of Nuclear Energy Nuclear energy protects air quality by producing massive amounts of carbon-free electricity. It powers communities in 28 U.S. states and contributes to many non-electric applications, ranging from the medical field to space exploration.
Explanation:
How many moles of carbon dioxide gas occupy a volume of 81. 3.
Answer:
239
Explanation:
i think this is the answer
Is the production of nitrogen(II) oxide exothermic or endothermic?
Formation of nitric oxide is a highly exothermic reaction
mention 10 products made from crude oil
Answer:
"After crude oil is removed from the ground, it is sent to a refinery where different parts of the crude oil are separated into useable petroleum products. These petroleum products include gasoline, distillates such as diesel fuel and heating oil, jet fuel, petrochemical feedstocks, waxes, lubricating oils, and asphalt.
A U.S 42-gallon barrel of crude oil yields about 45 gallons of petroleum products in U.S. refineries because of refinery processing gain. This increase in volume is similar to what happens to popcorn when it is popped."
"What are petroleum products, and what is petroleum used for?
Petroleum products include transportation fuels, fuel oils for heating and electricity generation, asphalt and road oil, and feedstocks for making the chemicals, plastics, and synthetic materials that are in nearly everything we use. Of the approximately 7.21 billion barrels of total U.S. petroleum consumption in 2016, 47% was motor gasoline (includes ethanol), 20% was distillate fuel (heating oil and diesel fuel), and 8% was jet fuel."
Solvents Diesel fuel Motor Oil Bearing Grease
Ink Floor Wax Ballpoint Pens Football Cleats
Upholstery Sweaters Boats Insecticides
Bicycle Tires Sports Car Bodies Nail Polish Fishing lures
Dresses Tires Golf Bags Perfumes
Cassettes Dishwasher parts Tool Boxes Shoe Polish
Motorcycle Helmet Caulking Petroleum Jelly Transparent Tape
CD Player Faucet Washers Antiseptics Clothesline
Curtains Food Preservatives Basketballs Soap
Vitamin Capsules Antihistamines
What is the definition of JET STREAM?
A.the winds that blow from the west and are in a narrow stream
B. generally,westerly winds concentrated in a relatively narrow and shallow stream up inn upper troposphere of the earth
C the winds that blow and are in a shallow stream in earth
D with that blow around the earth
Answer:
I believe D
Explanation:
I am dearly sorry If I am wrong,
Answer:
I believe the answer is B
Explanation:
In a first-order reaction, the initial concentration of A is 0.40 M. What is the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds
Answer:
0.0125M
Explanation:
yess! i love half life reactions!
half life equation: [tex]N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} }[/tex]
so basically, the initial amount is N_o
t_1/2 is the half life
and t is the time
0.40(1/2)^15/3= 0.0125M
The concentration of A after 15 seconds if the half-life of the reaction is 3 seconds is 0.0125M.
What is half life reaction ?The amount of time needed for a reactant to achieve half of its starting concentration or pressure is known as the half-life of a reaction. The half-life for a first-order reaction is concentration-independent and stable over time.
The amount of time it takes for the concentration of a given reactant to reach 50% of its initial concentration is known as the half-life of a chemical reaction (i.e. the time taken for the reactant concentration to reach half of its initial value). It is commonly expressed in seconds and is represented by the sign "t1/2."
The amount of time required for the reactant concentration to drop to half its initial value is known as the half-life of a reaction. A constant that is connected to the rate constant is the half-life of a first-order reaction.
The half life equation is
N(t) = N₀ (1/2)⁽ t / t¹/²⁾
N(t) = quantity of the substance remaining
N₀ = initial quantity of the substance
t = time elapsed
t_{1/2} = half life of the substance
so basically, the initial amount is N₀
t_1/2 is the half life and t is the time
0.40(1/2)^15/3
= 0.0125M
Thus, The concentration of A after 15 seconds if the half-life of the reaction is 3 seconds is 0.0125M.
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When thinking about valence electrons, how are the groups numbered? (more than one
answer)
How does the emission spectrum of the hydrogen atom provide evidence for the Bohr model of the atom
Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier know as the reaction's __________________.
Which statement best explains why animals have papillae?
Answer:Papillae contain taste buds that help animals determine whether food is safe to eat.
Explanation:
