A solid fuel designed for a rocket has an air pocket inside. What is the DANGER OF THIS?
A. The rocket might not generate enough lift
B. The rocket might slow down and fall from space
C. The rocket might explode from the added pressure when the combustion reaction hits the air pocket
D. the rocket might not be able to regulate its speed
Answer:
C. The rocket might explode from the added pressure when combustion reaction hits the air pocket.
Explanation:
Correct answer for *APEX quiz!
The rocket might explode from the added pressure when combustion reaction hits the air pocket. Hence, option C is correct.
What is combustion?Combustion is another word for burning. In a combustion reaction, a fuel is heated and it reacts with oxygen.
In a rocket engine , fuel and a source of oxygen, called an oxidizer, are mixed and exploded in a combustion chamber.
The combustion produces hot exhaust which is passed through a nozzle to accelerate the flow and produce thrust.
Hence, option C is correct.
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Question 2
Which of the following is an endothermic reaction?
Question 2 options:
dissolving sugar in water
iron rusting
campfire burning
ice melting
What might be damaged by ionizing radiation? *
lead
paper
soft tissue
1. A _____ is a framework of ideas and assumptions that has been well tested and can be used to explain some set of observations and make predictions about the world
A. law
B. theory
C. ladder
D. focus
I think it is B but please help me
2. How can astronomers locate objects in the sky?
A. by using altitude and zenith
B. by using latitude and longitude
C. by using distance and compass directions
D. by using the celestial sphere and constellations
I dont have a clue with this one please help me
1. A B. Theory is a framework of ideas and assumptions that has been well tested and can be used to explain some set of observations and make predictions about the world.
Although "theory" is a concept that is always in discussion, the scientifics agree on some points. It must be logically composed of concepts, definitions, assumptions, and generalizations. Secondly, it's major function is to describe and explain, it is important to say that a theory is a general explanation that leads to basic principles. In the third place, a theory is heuristic because it stimulates and guides to further development of knowledge.
2. How can astronomers locate objects in the sky?
D. by using the celestial sphere and constellations
Astronomers locate objects in the sky in a very simillar way we locate places in a map. Instead of using latitude and longitude, they use declination and right ascension. This is based on the celestial sphere, an imaginary object that is created by asuming all objects in space are at the same distance. By doing this astronomers can determine a line of zero latitude and zero longitude and therefore locate precisely distant objects. They can use also constelations as references with this same method.
Draw the lewis structure for the molecule ch3ch2cch. how many sigma and pi bonds does it contain?
The molecule CH3CH2CCH has a Lewis structure of H3C-CH2-C≡CH. It contains 11 sigma bonds and 2 pi bonds, which represent the different forms of covalent bonds due to the overlap of atomic orbitals.
Explanation:The molecule CH3CH2CCH, also known as 1-Butyne, is composed of hydrogen (H) and carbon (C) atoms. Its Lewis structure can be represented as:
H3C-CH2-C≡CH.
Here, each line represents a bond between two atoms, which could be a sigma (σ) or a pi (π) bond. In the case of CH3CH2CCH, there are a total of 11 sigma bonds. You can see these as the bonds between H and C in the CH3 and CH2 groups, the single bond between the two C atoms in the center, and the bond between the last C and H atoms. As for the pi bonds, represented by two lines (double/triple bonds), there are 2, which can be seen in the triple bond of C≡C.
Sigma bonds represent the overlap of atomic orbitals to form a covalent bond, with the electron density concentrated along the internuclear axis. Conversely, pi bonds occur due to the side-by-side overlap of atomic orbitals where the electron density is concentrated on two parallel lines.
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How many moles in 43 liters of co2 at stp?
Answer: wait im gonna search some info.
Explanation:I come back with an asnwer for you
the enthaply of a reaction can be measured using a ____
What is the number of oxygen atoms in the ring portion of the haworth structure of glucose?
Identify the oxidized substance, the reduced substance, the oxidizing agent, and the reducing agent in the redox reaction. mg(s)+cl2(g)⟶mg2+(aq)+2cl−(aq)
Magnesium is an oxidized substance (Mg). Substance Reduced: chlorine gas (Cl₂(g)). Chlorine gas (Cl₂(g)) is an oxidizing agent. Magnesium (Mg) is a reducing agent.
In the demonstrated redox reaction:
Cl₂(g) + Mg(s) →Mg₂⁺(aq) + 2Cl(aq).
These things can be found:
Magnesium (Mg) is the substance that oxidizes, losing electrons in the process. It transitions from its ionic form, Mg₂⁺(aq), to its elemental form, Mg(s). Therefore, the oxidized substance is magnesium (Mg).
Chlorine gas (Cl₂(g)) is the chemical that goes through reduction and obtains electrons. It transforms from its diatomic elemental form, Cl₂(g), to chloride ions, 2Cl(aq). As a result, the reduced substance is chlorine (Cl₂(g)).
Oxidizing Agent: The species that oxidizes another substance is known as an oxidizing agent. The oxidizing agent in this instance is chlorine gas (Cl₂(g)), which takes electrons from magnesium (Mg) during the process.
Reducing Agent: The species that results in the decrease of another substance is known as a reducing agent. Due to the fact that it provides electrons to chlorine gas (Cl₂(g)) during the reaction, magnesium (Mg) is the reducing agent in this instance.
So, to sum up:
Magnesium is an oxidized substance (Mg).
Substance Reduced: chlorine gas (Cl₂(g))
Chlorine gas (Cl₂(g)) is an oxidizing agent.
Magnesium (Mg) is a reducing agent.
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A "fizz saver" pumps air under pressure into a soda bottle to keep gas from escaping. will this keep co2 in the soda bottle? explain your answer.
Answer:
yeah...what he/she said...lol
Explanation: I was going to say that anyways.....btw am i the only one who has a problem with chemistry right now??? I need a tutor right about now....like baddddd!!!!
Photosynthesis is an endothermic chemical reaction that forms sugars from carbon dioxide, water, and the sun's energy. Which of the following must be true of photosynthesis?
The reaction can take place only if energy is added.
The reactants are oxidized.
The photosynthesis reaction produces ions.
The molecular bonds in carbon dioxide are very weak.
Answer: The reaction can take place only if energy is added.
Explanation:
Exothermic processes are those processes in which heat is released and endothermic processes are those processes in which heat is absorbed.
Photosynthesis is a phenomenon in which green plants containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water to form glucose and oxygen.
Photosynthesis is the process used by plants, algae and certain bacteria to convert energy from sunlight and turn it into chemical energy in the form of glucose which is used a s a source of energy by many organisms.
[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]
Thus photosyynthesis reaction can take place only if energy is added.
A condensation polymerization reaction produces a polymer and
1) H2
2) O2
3) CO2
4) H2O
What is the keq value for the following reaction at equilibrium at a temperature of 298K if the concentrations (in mol/L) of the reactants and products are [N2O4] = 0.0450 and [NO2] = 0.0161?
N2O4(g) <--> 2NO2(g)
When calcium carbonate is heated strongly, it forms calcium oxide and carbon dioxide. what mass of calcium carbonate is needed to make 50.0 g of calcium oxide?
To produce 50.0 g of calcium oxide, 89.29 g of calcium carbonate is required. The amount is calculated based on the fixed ratio of the decomposition reaction of calcium carbonate, which aligns with the law of conservation of mass.
To determine the mass of calcium carbonate ([tex]CaCO_3[/tex]) needed to produce 50.0 g of calcium oxide (CaO), it's essential to refer to the stoichiometry of the chemical reaction. The balanced chemical equation for the decomposition of calcium carbonate is:
[tex]CaCO_3(s) \rightarrow CaO(s) + CO_2(g)[/tex]From the given examples, we can deduce that when 10.0 g of calcium carbonate decompose, they produce 5.6 g of calcium oxide. This means there is a fixed ratio of mass of calcium carbonate to calcium oxide, which is:
Mass of CaCO3 : Mass of CaO = 10.0 g : 5.6 gTo produce 50.0 g of calcium oxide, we can set up a proportion based on the fixed ratio:
10.0 g CaCO3 / 5.6 g CaO = x g CaCO3 / 50.0 g CaOBy solving for x, which represents the mass of calcium carbonate needed, we can cross-multiply and divide to find the answer:
[tex]x = (10.0 g CaCO3 \times 50.0 g CaO) / 5.6 g CaO[/tex]x = 89.29 g of CaCO3
Therefore, to obtain 50.0 g of calcium oxide, you would need 89.29 g of calcium carbonate. This calculation is in agreement with the law of conservation of mass, which states that mass is neither created nor destroyed in a chemical reaction.
A chef is going to use a mixture of two brands of italian dressing. the first brand contains 7% vinegar, and the second brand contains 11% vinegar. the chef wants to make 240 milliliters of a dressing that is 8% vinegar. how much of each brand should she use?
Answer is: 180 mL of 7% vinegar and 60 mL of 11% vinegar.
ω₁ = 7% ÷ 100% = 0.07.
ω₂ =
11% ÷ 100% = 0.11.
ω₃ =
8% ÷ 100% = 0.08.
V₁ = ?.
V₂ =
?.
V₃ =
V₁ + V₂.
V₃ = 240 mL.
V₁ = 240 mL - V₂.
ω₁ ·
V₁ + ω₂ ·V₂ =
ω₃ · V₃.
0.07 · (240 mL - V₂) + 0.11 · V₂ = 0.08 · 240 mL.
16.8 mL - 0.07V₂ + 0.11V₂ = 19.2 mL.
0.04V₂ = 2.4 mL.
V₂ = 2.4 mL ÷ 0.04.
V₂ = 60 mL.
V₁ = 240 mL - 60 mL.
V₁ = 180 mL.
What monomers are found in DNA and RNA?
A-amino acids
B-nucleotides
C-fatty acids
D-saccharides
Why did the Tacoma Narrows Bridge Collapses
Final answer:
The Tacoma Narrows Bridge collapsed due to resonance caused by heavy crosswinds and insufficient damping. The bridge's design did not consider these factors, leading to its failure.
Explanation:
The catastrophic collapse of the Tacoma Narrows Bridge stands as a poignant reminder of the critical importance of comprehensive engineering considerations. The unfortunate event was precipitated by intense crosswinds that triggered resonant oscillations within the bridge, ultimately leading to its demise. The absence of sufficient damping, exacerbated by the detachment of support cables, allowed the oscillations to escalate uncontrollably, reaching destructive amplitudes.
The failure highlighted a critical oversight in the bridge's design, as it did not incorporate adequate measures to mitigate the effects of resonance. The omission of sophisticated mathematical tools for analyzing wave dynamics and resonance in structural engineering further underscored the limitations in understanding and predicting the complex interplay of forces. This incident spurred advancements in engineering practices, emphasizing the imperative of incorporating resonance considerations and meticulous mathematical modeling to enhance the structural integrity and resilience of bridges and similar constructions. The lessons learned from the Tacoma Narrows Bridge collapse have significantly influenced subsequent infrastructure projects, contributing to the evolution of engineering practices and the development of more robust and secure structures.
A certain radioactive material has a half-life of 36 minutes. Starting with 10.00 grams of this material, how many grams will be left after 2 hours?
A) 1.00 grams
B) 1.5 × 10-4 grams
C) 3.33 grams
D) 0.25 gram
Answer: The correct answer is C) 3.33 grams
Explanation: 1/8 of the initial 10 grams is a little more than 1 gram, while 1/16 of 10 grams is a little more than 1/2 gram. The only answer that falls in that range is 1.00 gram. Use the integrated rate equation: ln(g0/gt) = kt, also ln(2) = kt1/2. Therefore k = (0.693)/36 min = 0.0193 min-1. In addition to the specific chemical properties that distinguish different chemical classifications, chemicals can exist in several phases. For the most part, the chemical classifications are independent of these bulk phase classifications; however, some more exotic phases are incompatible with certain chemical properties. A phase is a set of states of a chemical system that have similar bulk structural properties, over a range of conditions, such as pressure or temperature. Physical properties, such as density and refractive index tend to fall within values characteristic of the phase. The phase of matter is defined by the phase transition, which is when energy put into or taken out of the system goes into rearranging the structure of the system, instead of changing the bulk conditions.
Sometimes the distinction between phases can be continuous instead of having a discrete boundary' in this case the matter is considered to be in a supercritical state. When three states meet based on the conditions, it is known as a triple point and since this is invariant, it is a convenient way to define a set of conditions.
The most familiar examples of phases are solids, liquids, and gases. Many substances exhibit multiple solid phases. For example, there are three phases of solid iron (alpha, gamma, and delta) that vary based on temperature and pressure. A principal difference between solid phases is the crystal structure, or arrangement, of the atoms. Another phase commonly encountered in the study of chemistry is the aqueous phase, which is the state of substances dissolved in aqueous solution (that is, in water).
Which type of van der walls force is responsible for holding polar molecules together? london dispersion dipole-dipole hydrogen bonding gravitational force?
Answer:
dipole-dipole
Explanation:
Polar molecules are formed as result of covalent bonds between atoms.
Dipole-dipole attraction are intermolecular bonds. Both London dispersion forces and dipole-dipole attraction are van der waals forces.
In dipole-dipole attraction, polar molecules (unsymmetrical molecules) line up such that the positive pole of one molecule attracts the negative pole of another. Example of such is found in HCl.
Answer:
Dipole-dipole forces are the van der Waals forces that hold polar molecules together!!
Explain how solid naphthalene in mothballs is distributed evenly through clothes in a drawer
Write a balanced nuclear equation for the beta decay of protactinium
The balanced nuclear equation for the beta decay of protactinium is 231Pa → 231U + β- + ν. In this equation, a protactinium-231 nucleus decays into a uranium-231 nucleus through the emission of a beta particle (β-) and an electron neutrino (ν).
Explanation:The balanced nuclear equation for the beta decay of protactinium is:
231Pa → 231U + β- + ν
In this equation, a protactinium-231 nucleus decays into a uranium-231 nucleus through the emission of a beta particle (β-) and an electron neutrino (ν). The atomic number of the nucleus increases by one, from 91 to 92, due to the gain of a proton.
How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? cacl2(aq) + k2co3(aq) → 2 kcl(aq) + caco3(aq) 1.12 g 2.23 g 0.896 g 4.47 g?
The calcium chloride needed to produce 1.5 grams of KCl is: 1.12 grams
Further explanationStoichiometry in Chemistry learn about chemicals mainly emphasizes quantitative, such as the calculation of volume, mass, number, which is related to numbers, molecules, elements, etc.
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
In the reaction there are also manifestations of reagent substances namely gas (g), liquid (liquid / l), solid (solid / s) and solution (aqueous / aq).
Reactions that occur:
CaCl₂ (aq) + K₂CO₃ (aq) → 2 KCl (aq) + CaCO₃ (aq)
From the reaction equation above, the reaction coefficient shows the mole ratio of reagents and products
mol CaCl₂: moles of KCl = 1: 2
relative molecular mass KCl = 74.6
relative molecular mass of CaCl2 = 111
then the mole:
mole KCl = mass: relative molecular mass
mole KCl = 1.5 gram: 74.6
mole KCl = 0.020107
so that
mole CaCl₂ = 1/2. 0.020107
mole CaCl₂ = 0.0100535
So the mass of CaCl2 = mole x relative molecular mass
mass CaCl₂ = 0.0100535 x 111
mass CaCl₂ = 1.12 gram
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Keywords: CaCl2, KCl, mole, mass, relative molecular mass
The mass calcium chloride needed is 1.12 g
The balanced equation for the reaction is illustrated below:
CaCl₂ + K₂CO₃ —> 2KCl + CaCO₃
Next, we shall determine the mass of CaCl₂ that reacted and the mass of KCl produced from the balanced equation.
Molar mass of CaCl₂ = 40 + (35.5×2)
= 40 + 71
= 111 g/mol
Mass of CaCl₂ from the balanced equation = 1 × 111 = 111 g
Molar mass of KCl = 39 + 35.5
= 74.5 g/mol
Mass of KCl from the balanced equation = 2 × 74.5 = 149 g
Thus,
From the balanced equation above,
111 g of CaCl₂ reacted to produce 149 g of KCl.
Finally, we shall determine the mass of CaCl₂ needed to produce 1.5 g of KCl as follow:
From the balanced equation above,
111 g of CaCl₂ reacted to produce 149 g of KCl.
Therefore, X g of CaCl₂ will react to produce 1.5 g of KCl i.e
X g of CaCl₂ = [tex]\frac{1.5 * 111}{149}[/tex]X g of CaCl₂ = 1.12 gThus, 1.12 g of calcium chloride, CaCl₂ is needed to produce 1.5 g of KCl.
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why are you able to collect a more concentrated sample of ethanol from a mixture of water and ethanol using fractional distillation
Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3 no2(g) + h2o(ℓ) −→ 2 hno3(ℓ) + no(g) if 854 l of no2 gas react with water, what volume of no gas will be produced? assume the gases are measured under the same conditions. answer in units of l.
Final answer:
To determine the volume of NO gas produced from 854 L of NO₂ gas reacting with water, the stoichiometry of the balanced reaction (3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)) indicates a 3:1 ratio. Using this ratio, the calculated volume of NO gas produced is 284.67 L.
Explanation:
To calculate the volume of NO gas produced when 854 L of NO₂ gas react with water, we can use the stoichiometry of the balanced chemical equation:
3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)
According to the equation, 3 moles of NO₂ produce 1 mole of NO. This ratio can be applied to the volumes of the gases involved, as they are both measured under the same conditions and thus follow the ideal gas law where volume is directly proportional to moles.
To find the volume of NO produced:
Determine the mole ratio from the chemical equation: 3 moles of NO₂ produce 1 mole of NO.
Use the mole ratio to find the volume ratio for NO₂ to NO, which is also 3:1.
Apply the volume ratio to the given volume of NO₂: 854 L of NO₂ × (1 mole NO / 3 moles NO₂) = 284.67 L of NO.
So, under the same conditions, the volume of NO gas produced would be 284.67 L.
If the reactants of a reaction have one s and four o atoms, what will the products have?
Answer:
one S four O atoms
Explanation:
After measurements or observations are made in a scientific investigation, it is most appropriate to
After observations are made, it is crucial to record and present results properly, discuss findings, and formulate hypotheses for further testing in the scientific investigation process.
After measurements or observations are made in a scientific investigation, it's most appropriate to record your observations and present your results in a suitable format, such as tables and graphs. Discussing findings with group members is also important, coupled with formulating a relevant central idea. If a scientist develops a new idea based on their observations of nature, the next step would be to make a new hypothesis, which can then be tested through experiments.
As part of the scientific method, it's essential not to force data to fit a hypothesis. Instead, draw conclusions from the experiment results objectively. If data fits, you should repeat the experiment to verify results, or if it does not, conduct more background research and refine the hypothesis.
HELP PLEASE!! ILL GIVE 20 POINTS :)))
1)The compound CO2 is an example of a(n) (2 points)
atom
element
ionic compound
covalent compound
2) What is another name for a compound known as a salt? (2 points)
Molecule
Covalent compound
Element
Ionic compound
What type of radioactive decay involves only the release of high-energy photons and therefore does not change the mass of an atom of a radioactive isotope?
Which represent correct variations of the formula for speed? Check all that apply. t = s = t = s = dt d = st d =
Answer: t = d/s , s= d/t d= st
Explanation:
I did the assignment (Also Ikix don´t take this down again)
The correct variations of the speed formula are d = st, representing the calculation of distance, and t = d/s, representing the calculation of time. The options s = t and s = dt don't seem to be valid variations of the speed formula.
Explanation:The formula for speed is typically represented as s = d/t, where s is speed, d is distance, and t is time. The variations of this formula would then be d = st, which gives us the distance traveled if we know the speed and time, and t = d/s, which gives us the time taken if we know the distance and speed. These variations are crucial in different parts of physics, primarily when dealing with motion-related problems.
In the question, the terms d = st and t = d/s are correct variations, while s = t and s = dt don't seem to be valid in the context of speed formula. In speed calculations, it's always important to remember units of measurement, as speed could be recorded in terms such as miles per hour or meters per second, depending upon the context.
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The acid dissociation constant for an acid dissolved in water is equal to the ____.
a. equilibrium constant
b. equilibrium constant times the concentration of water
c. equilibrium constant divided by the concentration of water
d. equilibrium constant times the equilibrium constant of water
Answer:The correct answer is option b.
Explanation:
[tex]HA+H_2O\rightleftharpoons A^-+H_20^+[/tex]
The equilibrium constant expression is given as:
[tex]K_{eq}=\frac{[A^-][H_3O^+]}{[HA][H_2O]}[/tex]
[tex]K_a=K_{eq}\times [H_2O]=\frac{[A^-][H_3O^+]}{[HA]}[/tex]
The acid dissociation constant is product of equilibrium constant and concentration of water.
Hence,from the given options the correct answer is option b.