Beth has two unlabeled balloons, one filled with hydrogen gas and the second filled with neon gas. She researches and writes down the density of hydrogen and neon. Beth also has several chambers filled with various gases and a poster showing the densities of these gases. She has no other materials or tools available to her to help her identify the element in each balloon.The poster and Beth’s data are shown.
I went for a walk the other day. I went four blocks east, then seven blocks south, then one block west and finally
eight blocks north
a.What distance did I travel?
b. What's my displacement?
Answer:
a) distance is 4+7+1+8=20 blocks
b) displacement is 10 blocks
Explanation:
find displacement: x and y
x axis displacement = 4-1 = 3 blocks
y axis displacement = -7+8= 1 block
displacement = the square root of 3^2 + 1^2
= 9+1 = 10 blocks.
You can find the angle of displacement with respect to the initial position using trig identities, if you wish.
Which is the correct number of moles of nitrogen monoxide that is produced from 13.2 moles of oxygen gas in the presence of excess ammonia (NH3)?
Answer:
10.56 moles of NO will be produced
Explanation:
The balanced reaction of ammonia, NH₃ with oxygen, O₂ is:
4NH₃ + 5O₂ → 4NO + 6H₂O
Where 5 moles of oxygen react with an excess of ammonia to produce 4 moles of nitrogen monoxude.
If 13.2 moles of O₂ react:
13.2 mol O₂ * (4 mol NO / 5 mol O₂) =
10.56 moles of NO will be producedMany animals influence and contribute to ecosystem services. As pollinators, how do butterflies ultimately contribute to direct ecosystem services?
Answer:
yEs
Explanation:
What is the formula of the compound between calcium and sulfur that has the percent composition 55.6% (by mass) calcium and 44.4% (by mass) sulfur? What is the formula of the compound between calcium and sulfur that has the percent composition 55.6% (by mass) calcium and 44.4% (by mass) sulfur? Ca2S4 CaS Ca2S CaS4 CaS2 Request
Answer: The empirical formula is [tex]CaS[/tex]
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of Ca= 55.6 g
Mass of S = 44.4 g
Step 1 : convert given masses into moles.
Moles of Ca =[tex]\frac{\text{ given mass of Ca}}{\text{ molar mass of Ca}}= \frac{55.6g}{40.08g/mole}=1.38moles[/tex]
Moles of S =[tex]\frac{\text{ given mass of S}}{\text{ molar mass of S}}= \frac{44.4g}{32.06g/mole}=1.38moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For Ca = [tex]\frac{1.38}{1.38}=1[/tex]
For S = [tex]\frac{1.38}{1.38}=1[/tex]
The ratio of Ca : S = 1:1
Hence the empirical formula is [tex]CaS[/tex]
Mg + 2HCl ⟶ MgCl2 + H2
How many grams of MgCl2 are produced by 2.55 mol Mg?
Answer: m = nM= 242.8 g
Explanation: amount of MgCl2 is same as n(Mg)
M(MgCl2) = 95.21 g/mol
95.21 g/mol is the mass in grams of MgCl[tex]_2[/tex] are produced by 2.55 mol Mg in the reaction Mg + 2HCl ⟶ MgCl[tex]_2[/tex] + H[tex]_2[/tex].
What is mass?A body's mass is an inherent quality. Prior to the discoveries of the concept of atom as well as particle physics, it was widely considered to be tied to the amount of matter inside a physical body. It was discovered that, despite having the same quantity of matter in theory, different atoms and elementary particles have varied masses.
There are various conceptions of mass in contemporary physics that are theoretically different but physically equivalent. The resistance of the body to accelerate (change of velocity) in the presence of a net force can be measured experimentally as mass. The gravitational pull an object has on other bodies is also influenced by its mass.
m = n×M= 242.8 g
M(MgCl[tex]_2[/tex]) = 95.21 g/mol
Therefore, 95.21 g/mol is the mass in grams of MgCl[tex]_2[/tex] are produced by 2.55 mol Mg in the reaction Mg + 2HCl ⟶ MgCl[tex]_2[/tex] + H[tex]_2[/tex].
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Citric acid and rennet are added to milk to make cheese. What is the evidence that this is a
chemical reaction?
gas production
formation of a precipitate
light is released
color change
Answer:
formation of a precipitate.
Explanation:
This is because during production of cheese, citric acid is added to raise the acid level and rennet is added as an enzymes. This make the milk to coagulate and form solid and semi solids. Some part become solid part which is the cheese and the water is separated and it is called whey. That is it separated the solid from the liquid part . The precipitate is the solid part.
Please help as soon as possible please and thank you.
Large drops of rain form in a cumulonimbus cloud are started by______.
Select one:
a. small rain droplet colliding with others and forming larger drops
b. hail stones melting
c. water vapor condensing in larger quantity
Answer:
The answer is A. I took the test today.
Explanation:
Temperature, according to the kinetic molecular theory, is a measure of intermolecular attraction.
TRUE or FALSE
how do I complete this column graph of the number of conductors vs the number of insulators
the Conductors are:
carbon,iron nail, aluminium foil, copper wire
the Insulators are:
Paddle pop stick
plastic spoon
and please explain how to do it
it's due this Friday the 26th
it is a Science
Answer:
sorry but i am doing this for point
Explanation:
how do I complete this column graph of the number of conduct vs the number of
Help please because why not
What is metal ? Where does it coke from ?
Answer:
Most pure metals, like aluminium, silver and copper, come from the Earth's crust. They are found in ores – solid materials called minerals, usually occurring in rock, from which the pure metal has to be extracted. The properties of pure metals can be improved by mixing them with other metals to make alloys.a metal is an element that readily forms positive ions (cations) and has metallic bonds
coke is a strong stimulant made from coca leaves
Use the following reaction:
2KCIO, -> 2KCI + 302
If 5.00 g of KClo, is decomposed, how many grams of o, is produced?
A. 0.0612 grams 02
B. 0.979 grams 02
C. 1.96 grams 02
D. 5.88 grams 02
Help me please I’ll give brainliest answer
Answer:
the answer is c I believe
Pls 50 points right answer gets brainliest
Explain the meaning of thermal energy transfer and give specific examples of conduction, convection, and radiation.
Answer:
thermal energy: the part of total internal energy that can be transferred (a portion of the kinetic energy)
heat is the thermal energy that flows from one substance to another due to a temperature difference.
Thermal energy is measured in temperature change.
Thermal energy transfer stops when thermal equilibrium is achieved (Both substances at the same temperature).
conduction: Transfer of thermal energy through a solid object like heat transferring up a metal spoon from a hot cup of coffee.
convection: the transfer of thermal energy due to the movement of a liquid or gas caused by differences in temperature. Only in a fluid (liquid or gas). Breezes, ocean currents.
radiation: Transfer energy with or without matter. Warming from the Sun, microwave oven.
Answer:
Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission. Hope this helps!
Explanation:
How many formula units are in 9.8 grams of calcium hydroxide?
Answer:
There are 9.8 ×1021. formula units in 10,005.8gCaO
Explain the flexibility and the flow characteristics of water
Explanation:
Flow-duration data are daily mean flow values measured over a specified time interval that have been exceeded various percentages of the specified time interval.
Water is a very flexible material. It can flow in many different directions and shapes. This flexibility makes it great for many different purposes, such as drinking, washing, and irrigation. Water is considered to be a flexible substance because it can change its shape according to space.
What are the characteristics of water?Water is a liquid at standard temperature and pressure (25 degrees Celsius and 1 atm, for liquids).
Water is is tasteless and odorless.
Water is transparent in the visible part of the electromagnetic spectrum.
Water can act as either an acid or a base.
Water is a universal solvent, dissolving many substances found in nature.
Water is the most abundant compound on Earth’s surface. In nature, water exists in the liquid, solid, and gaseous states. It is in dynamic equilibrium between the liquid and gas states at 0 degrees Celsius and 1 atm of pressure. At room temperature (approximately 25 degrees Celsius), it is a tasteless, odorless, and colorless liquid. Many substances dissolve in water, and it is commonly referred to as the universal solvent.
Therefore, Water is a very flexible material. It can flow in many different directions and shapes. This flexibility makes it great for many different purposes, such as drinking, washing, and irrigation. Water is considered to be a flexible substance because it can change its shape according to space.
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Can someone plzzzzz helppppp me plzzzzzz( and don’t tell me to click a link it doesn’t work)
Answer: First Scientific method
Second: question
Third: research
Fourth: hypothesis
Fifth: experiment
Sixth: procedure
Seventh: variable
Eighth: observe
Ninth: interpret
Tenth: record
Eleventh: ethical
Twelfth: conclusion
Explanation: That is the order that the words in the box go in. Hope this helps!
in the rainforest, plants that live on the forest floor have different adoptions from plants that live high up in the canopy. what is the main reason that leaves of plants on the rain forest floor are much wider than those found higher in the canopy of the rain forest?
1: these plants produce poisons that plants in other area do not.
2: these plants have less access to light then plants in other areas.
3: These plants need to take in more water than plants in other areas.
4: these plants have more natural predators then plants in other areas.
Answer:
option 3, the leaves higher up need less water since there getting more light and the ones lower need to adapt to gaining more water since they won't be seeing much light
what evidence is there in the diagrams to support the classification of these substances as elements
Awnser your loooking fo its got to be aluminium
Explanation:i took the dang subgect
Newtons third law explains what happens when two objects-
Answer:
When one object uses force to move the other.
Explanation:
This is called Thrust.Thrust is used in airplane engines,or an engine can be a source of Thrust,we use our legs to Thrust us forward when we walk!
Sir Isaac Newton's third law explains that for every action, or force, in nature, there is an equal and opposite reaction.
Hope that helps!
What ratio of NaCN to HCN is needed to prepare a pH 9.40 buffer? (Ka of HCN is 4.9 × 10⁻¹⁰)
Answer: The ratio of NaCN to HCN is, 1.26
A tall plant (Tt) is crossed with a short plant (tt). What percent will be short?
Group of answer choices
75%
0%
100%
50%
25%
it should be 50/50 percent
so 50%
hopefully this is right !
What might happen if 490 g of sugar is dissolved in water at 100°C and then the water cools to 20°C?
Answer:
crystallization
Explanation:
When 490g of sugar is dissolved completely in water at a high temperature ( 100°C ) and the solution is been cooled to a lower temperature ( 20°C ), The dissolved sugar in the solution will start to crystallize, This is because the solubility of sugar in water decreases with a decrease in temperature of water.
N2-3H2 → 2NH3
How many moles of hydrogen, H2, are needed
to react with 2.0 moles of nitrogen, N2?
Answer:
6 mols H2 are needed
Explanation:
N2 = 28.01g/mol
H2 = 2.02g/mol
[tex]\frac{2 mol N_{2} }{1}[/tex] * [tex]\frac{3 mol H_{2} }{ 1 mol N_{2} }[/tex] = 6 mol H2
PLZ HELP ME. I NEED ANSWER ASAP!!!!!!
Which of the following is not true regarding an acid?
Select one:
a. can accept a proton (H+) from some other substance
b. neutralizes hydroxide ions to form water
c. can donate a proton (H+) to some other substance
Answer:
Answer 'A'
Explanation:
There are 3 acid-base theories.
- Arrhenius Theory
- Bronsted-Lowry Theory
- Lewis Theory
In the Arrhenius and the Bronsted-Lowry Theories, for an acid to be an acid two requirements must be met. That is, the substance must be soluble in water and two, undergo ionization generating a hydronium cation (H₃O⁺) and a base anion (A⁻) in process; i.e., H-Anion + H₂O => H₃O⁺ + Anion⁻.
The Lewis Theory defines acids and bases in terms of electron pair donation (the base) and electron pair acceptor (the acid). This theory does not require the presence of an ionizable hydrogen in the substance of interest, only non-bonded electron pairs (base) and a cationic character that accepts electron pairs without violating the octet rule in chemical bonding.
For the purpose of answering your question, the Arrhenius and Bronsted-Lowry theories are sufficient for defining acids and bases undergoing ionization in aqueous media. With this, one should understand also that acids and bases are classified as strong acids and strong bases (compounds that ionize 100% aqueous media) or weak acids and weak bases (compounds that do not ionize 100% in aqueous media).
Strong Acids* include HCl, HBr, HI, HNO₃, HClO₄ & H₂SO₄ (1st ionization step only). Strong Bases include Group IA and Group IIA hydroxides except for Beryllium Hydroxides. The weak acids are compounds with ionizable hydrogens that are NOT members of the strong 6 listed above. The weak bases are ammonia and ammonia derivatives in aqueous media.
It is recommended that students only need to memorize the strong six acids in that any compound not one of these six with an ionizable hydrogen is a weak acid whether you know its name or not. The weak bases, as mentioned, are ammonia and ammonia derivatives in water. These compounds will undergo coordinate bonding to generate an ionizable compound containing an ammonium cation and hydroxyl anion. The reaction is as follows:
RNH₂ + H₂O => RNH₃⁺OH⁻(aq) => RNH₃⁺(aq) + OH⁻(aq)
Typically, weak acids and weak bases undergo very limited ionization in the range of 1% to 2%. The compounds remaining are in concentrations of 98% - 99% unionized but form soluble homogeneous solutions.
If you have further questions, kick back a note. Doc
___________________-
*Some scholars include sulfurous acid (H₂SO₃) as a strong acid but analysis shows aqueous solutions - under special conditions - to contain unionized H₂SO₃ and thus violates the 100% ionization requirement.
Can someone help with this question I will big BRAINLEST quick thank you
Answer:
Charle's Law ... V ∝ f(T); Pressure and Mass remain constant
Explanation:
Charle's Law is one of the empirical gas laws relating the effect of temperature on volume of a gas while pressure and mass (moles) of substance remain constant. Basically, Charle's Law states that the change in volume associated with a confined mass or gas is directly proportional to the applied temperature.
For a directly proportional relationship between Volume (V) and Temperature (T) the empirical formula is written V ∝ T. This is then set in equation form by including a 'proportionality constant' giving V = k·T. In applications, problems generally provide 'initial' Temperature (T₁) and Volume (V₁) along with a final Temperature (T₂) or final Volume (V₂) and asked to calculate the unknown variable. The Charle's Law relationship detailing this is derived as follows:
V = k·T => k = V/T
The k-value is constant for both the initial and final conditions such that...
k₁ = k₂ => V₁/T₁ = V₂/T₂
Example: Assume a gas volume of 25 liters at 25°C, what would be the gas volume if cooled to 0°C?
Set-up a data table
V₁ = 25L & V₂ = ?
T₁ = 25°C & T₂ = 0°C => these values need to be converted to Kelvin Temps so as to avoid division by '0'. So...
T₁ = (25 + 273)K = 298K & T₂ = (0 + 273)K = 273K
Substituting into V₁/T₁ = V₂/T₂ and solving for V₂ provides the new volume.
25L/298K = V₂/273K => V₂ = (25L)(273K)/(298K) = 22.9L ≅ 23L (2 sig. figs.)
Generally, to check work, examine the change in volume relative to the change in temperature. For a direct proportionality a decrease in temperature as in the example would give a decrease in volume consistent with Charle's Law. Note that 273K/298K times 25L gives a smaller resulting volume value. If one applies '298K/273K' times the 25L, a larger value would result and is inconsistent with Charle's Law.
Directions Identify the reactants and product in the following reaction.
4A1+302 → 2A1203
Someone help please! Extra points & brainlest!
Answer:
golgi apparatus
Explanation:
Answer:
vacuole
Explanation:
the answer is vacuole im pretty sure!
wont more BRAINLYS just answer the question right
Answer:
1. A.
2. D.
3. E.
4. B
5. C.
Explanation:
1. The water cycle uses radiant energy from the sun to function
2. Crystals form by crystalization, hence the name.
3. Condensation is when water vapor changes to a liquid.
4. The water cycle is the movement of water on earth on and below it's crust.
5. Transperation is how plants release water into the air. Also how humans sweat.
Have a most wonderous day!