Answer:
The space shuttle was the result of committee compromise and political expediency. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).
Explanation:
Answer:
The space shuttle was the result of committee compromise and political expediency. In 1990 Scientists decided to launch the space shuttle. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).
Ann dissolves four tablespoons of salt in a bowl of water. She notices that the water has become salty. Ann then keeps
the bowl out in the sun for along time. The water in the bowl evaporates, leaving crystals of salt behind in the bowl.
What kinds of change(s) have happened?
1)The salt dissolving is a physical change and the evaporation of water is a chemical change.
2)Both the salt dissolving and the evaporation of water are physical changes.
3)The salt dissolving is a chemical change, and the evaporation of water is a physical change.
4)Both the salt dissolving and the evaporation of water are chemical changes
Answer:
2)Both the salt dissolving and the evaporation of water are physical changes.
Explanation:
The two kinds of changes that has occurred are both physical changes.
Dissolution of a solute such as salt in water and evaporation of water from a solution are physical changes.
A physical change is one in which the physical property of matter is altered. Particularly the state and the form.
In many of these cases, the change is easily reversible.
Since this change is reversible in that we were able to collect the salt back, this is a physical change.
Help me please omg I don’t know
Answer:
5 1 2 4and 3 this is correct way
what is the weight in newton’s of a person with a mass of 80 kg
Answer:784.532 newton
A student needs to run 3.2
km to get to school. If the student can run 5.5
mi/hr , how many hours will it take them to get to school?
Answer:
Hope this helps.
Explanation:
Convert from miles to kilometers (rounded to 2 decimals):
5.5 mi/h * 1.609 = 8.86 km/h
The student arrives at school in:
8.86 km ------------- 1 h
3.2 km ---------------- x
x = 3.2 * 1 / 8.86
x = 0.3611 hours
If we place 15 moles of NaN3, how many
grams of NaN3 do you have before the
reaction?
Answer:
25.8 g C6H12O6
Explanation:
The atomic number of sodium (Na) is 11. The element phosphorus (P) is the fourth element to the right of sodium in the periodic table.
The atomic number of phosphorus is ____. It has zero charge because it had ____ electrons.
Answer:
atomic number of phosphorous is 15. It has zero charges because it has equal number of protons and electrons
Explanation:
2. How many moles of NO3, will be produced with this amount of oxygen
gas?
The given question is an incomplete question, the complete question is given below.
Use this equation to answer the questions that follow.
[tex]3O_2(g)+N_2(g)\rightarrow 2NO_3(g)[/tex]
5 moles of oxygen gas are present. How many moles of [tex]NO_3[/tex] will be produced with this amount of oxygen gas?
Answer : The moles of [tex]NO_3[/tex] produced will be 3.33 moles.
Explanation : Given,
Moles of oxygen gas = 5 moles
Now we have to calculate the moles of [tex]NO_3[/tex].
The given balanced chemical equation is:
[tex]3O_2(g)+N_2(g)\rightarrow 2NO_3(g)[/tex]
From the balanced chemical equation we conclude that,
As, 3 moles of [tex]O_2[/tex] gas react to produces 2 moles of [tex]NO_3[/tex] gas
So, 5 moles of [tex]O_2[/tex] gas react to produces [tex]\frac{2}{3}\times 5=3.33[/tex] moles of [tex]NO_3[/tex] gas
Therefore, the moles of [tex]NO_3[/tex] produced will be 3.33 moles.
1or the question.
3. What's the requirement of every single
natural process on Earth?
Classify each of the substances as a mixture, a compound, or an element.
Mixture
Compound
Element
Answer Bank
methane
vinegar
water
steel
milk
helium
aluminum
table sugar
table sugar
Explanation:
An element is a distinct substance that cannot be split - up into simpler substances. Such substances consist of only one kind of atom.
From the list, the elements are:
helium
aluminum
A compound is substance composed of two or more kinds of atoms or elements joined together in a definite grouping. The properties of a compound are distinct and different from those of the individual elements that are combined in its make - up.
methane
water
Table sugar
A mixture is a substance made up of indefinite composition. The constituents reacts differently to changed conditions. They are easily separated into constituents by physical methods.
Vinegar
Steel
Milk
Pls help ASAP........ A student was roasting marshmallows over a fire. The student
noticed that the marshmallows turned brown, and they were
bubbling. Is this a chemical or physical change to matter? How do
you know? List two signs that you know what type of change it is.
Answer:
A chemical change
Explanation:
The marshmallow turning brown and bubbling implies that a chemical change has taken place.
For chemical changes to occur, we observe any of the following:
a new kind of matter is formed. it is always accompanied by energy changesthe process is not easily reversibleit involves a change in massrequires considerable amount of energy.ii. Two signs that shows a chemical change has taken place is that:
bubbles are being formed as it is roasted and it implies that new substances have been formed. also, significant amount of heat energy is supplied for the roasting.What happens inside a closed car on a hot day?
A. The pressure inside the car increases.
B. The number of molecules increases.
C. The volume inside the car increases.
D. The molecules of gas slow down.
SUBMI
Answer:
A
Explanation:
In a hot car, the air molecules are heated, which cause them to speed up. The fast speed of these air molecules cause them to bounce off each other and the walls faster and harder, which will increase the pressure in the car.
We have that what happens inside a closed car on a hot day is
The volume inside the car increases.The pressure inside the car increases.Option A,C
From the question we are told
What happens inside a closed car on a hot day?
A. The pressure inside the car increases.
B. The number of molecules increases.
C. The volume inside the car increases.
D. The molecules of gas slow down.
Generally
Inside a closed car on a hot day the volume inside a car increases.
the molecules of gas gets active with increase in kinetic energy of the molecules increases hitting the walls of the car and the sun also expands the metal walls of the car
Thereby increasing the pressure of molecules in the car
Inside a closed car on a hot day the volume inside a car increases.
Hence
What happens inside a closed car on a hot day is
The volume inside the car increases.The pressure inside the car increases.Option A,C
For more information on this visit
https://brainly.com/question/17756498
Which object gives off heat?
A)
blanket
Eliminate
B)
flashlight
C)
fork
D)
hammer
Answer:
Flashlight
Explanation:
A flashlight gives out heat
hope this helps...
how dose the mass and size of an atom compare to the mass and size of the nucleus
Answer:
Explanation:
The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom. ... (10-15 m is typical for the smaller nuclei; larger ones go up to about 10 times that.) Mass. Although it is very small, the nucleus is massive compared to the rest of the atom.
Calculate the following:
1. Mass of 4.3x10-3 mol of lead
2. Mass of 3.8x1022 antimony atoms
3. Number of atoms in 15.5 kg of tungsten
Answer:
1) Mass = 890.96 g
2) Mass = 7.67 g
3) 507.65 ×10²³ atoms
Explanation:
1) Given data:
Number of moles of lead = 4.3×10⁻³ mol
Mass of lead = ?
Solution:
Mass = number of moles × molar mass
Molar mass of lead = 207.2 g/mol
by putting values,
Mass = 4.3×10⁻³ mol × 207.2 g/mol
Mass = 890.96 g
2) Given data:
Number of atoms of antimony = 3.8×10²² atoms
Mass of antimony = ?
Solution:
1 mole contain 6.022 ×10²³ atoms
3.8×10²² atoms × 1 mol / 6.022 ×10²³ atoms
0.63×10⁻¹ mol
0.063 mol
Mass:
Mass = number of moles × molar mass
Molar mass of lead = 121.76 g/mol
Mass = 0.063 mol × 121.76 g/mol
Mass = 7.67 g
3) Given data:
Mass of tungsten = 15.5 Kg (15.5 kg × 1000 g/ 1kg = 15500 g)
Number of atoms = ?
Solution:
Number of moles of tungsten:
Number of moles = mass/molar mass
Number of moles = 15500 g / 183.84 g/mol
Number of moles = 84.3 mol
1 mole contain 6.022 ×10²³ atoms
84.3 mol × 6.022 ×10²³ atoms / 1mol
507.65 ×10²³ atoms
25 POINTS FOR SCIENCE! PLEASE HELP!! THANK YOU!!!!
1. 9.36 moles S
2. 0.213 moles Al
Further explanationGiven
Reaction
2Al+3S⇒Al₂S₃
Required
moles of S
moles of Al
Solution
The reaction coefficient in a chemical equation shows the mole ratio of the compounds involved in the reaction (reactants or products)
1. 3.12 moles Al₂S₃From equation, mol ratio of Al₂S₃ : S = 1 : 3, so mol S :
= 3/1 x mol Al₂S₃
= 3/1 x 3.12
= 9.36 moles S
2. 0.32 moles SFrom equation, mol ratio of Al : S = 2 : 3, so mol Al :
= 2/3 x mol S
= 2/3 x 0.32
= 0.213 moles Al
Urea (CH4N2O) is a common fertilizer that can be synthesized by the reaction of ammonia (NH3) with carbon dioxide as follows:
2NH3(aq)+CO2(aq)→CH4N2O(aq)+H2O(l)
In an industrial synthesis of urea, a chemist combines 128.9 kg of ammonia with 211.4 kg of carbon dioxide and obtains 166.3 kg of urea.
Determine the theoretical yield of urea
The theoretical yield of urea : = 227.4 kg
Further explanationGiven
Reaction
2NH3(aq)+CO2(aq)→CH4N2O(aq)+H2O(l)
128.9 kg of ammonia
211.4 kg of carbon dioxide
166.3 kg of urea.
Required
The theoretical yield of urea
Solution
mol Ammonia (MW=17 g/mol)
=128.9 : 17
= 7.58 kmol
mol CO₂(MW=44 g/mol) :
= 211.4 : 44
= 4.805 kmol
Mol : coefficient of reactant , NH₃ : CO₂ :
= 7.58/2 : 4.805/1
=3.79 : 4.805
Ammonia as limiting reactant(smaller ratio)
Mol urea based on mol Ammonia :
=1/2 x 7.58
=3.79 kmol
Mass urea :
=3.79 kmol x 60 g/mol
= 227.4 kg
A flammable material is burning.
EXO
ENDO
Im really confused and i need help asap
which particles(s) is/are counted in the mass number
Answer:
A component's mass number (A) is the amount of the quantity of protons and the quantity of neutrons. The little commitment of mass from electrons is dismissed in ascertaining the mass number.
Explanation:
Balance this reaction.
___CO + ___H2 → ___CH3OH
nevermind...
options for each blank: blank,2,3,4
Answer:
4 CO + 8 H2 -> 4 CH3OH
Hope that it works
The Sun is the key driving force of weather and climate. Which of the following is true regarding how weather and climate compare? *
Weather refers to conditions nearer to the ground; climate refers to conditions in the atmosphere.
Climate refers to conditions over long periods of time; weather refers to conditions over short periods of time.
Weather refers to conditions in the atmosphere; climate refers to conditions nearer to the ground.
Climate refers to conditions over short periods of time; weather refers to conditions over long periods of time.
Answer:
yes
Explanation:
big brain
Plzzzzzzzz helpppppppppp
Answer:
true
Explanation:
They explained it in the answer
Is it more difficult to remove a valence electron from a Magnesium (Mg) atom or a Chlorine (Cl) atom
Answer: It is more difficult to remove a valence electron from a Chlorine (Cl) atom
Explanation:
Ionization energy is the energy required to remove the valence electron from an isolated gaseous atom.
Magnesium (Mg) is the 12th element of periodic table and has an atomic number of 12. The electronic configuration is 2, 8, 2. It can easily lose its valence 2 electrons to attain stable configuration.
Chlorine (Cl) is the 17th element of periodic table and has an atomic number of 17. The electronic configuration is 2, 8, 7. It has a tendency to gain electron to attain stable configuration. It cannot lose its valence electron easily as the valence electrons experience more nuclear charge.
Thus it is more difficult to remove a valence electron from a Chlorine (Cl) atom
Chlorine(Cl) is the more difficult to remove a valence electron from which is
because it needs one electron to achieve a stable octet configuration.
Magnesium (Mg) is an element which has an atomic number of 12. The
electronic configuration is 2, 8, 2. This means it has to lose its 2 valence
electrons needed to attain a stable octet configuration.
Chlorine (Cl) is an element which has an atomic number of 17. The electronic
configuration is 2, 8, 7. This means it has to gain one valence electrons
needed to attain a stable octet configuration.
Thus it is more difficult to remove a valence electron from a Chlorine (Cl)
atom than Magnesium atom.
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How many atoms are in 2.4 moles of oxygen?
Answer:
maybe 2455.2, good luck
The spring constant is
5333Nm. What is the
potential energy of this
spring when it
compressed by
3.50cm?
Answer:
3.50 is answer guyExplanation:
ok if yes do follow
This type of equation is a what reaction?
Answer:
Decomposition
Explanation:
H2CO3 Breaks down to H2O and CO2
wurtz reaction can be used to prepare higher hydrocarbons. how many product may be formed by reaction of ethyl iodide and methyl iodide with sodium? a) 1 b) 2 c)3 d)4
Answer:
b) 2
Explanation:
The Wurtz reaction is a reaction in which the hydrocarbon chain in lengthened by reaction two alkyl halides with sodium. The reaction is carried out in dry ether.
When methyl iodide reacts with ethyl iodide, two products are formed; the hydrocarbon product and sodium iodide.
Na/Ether
CH3CH2I + CH3I ----------> CH3CH2CH3 + 2NaI
whats kinetix energy
Explanation:
kinetic energy is the energy an object has while in motion, if I'm walking I have kinetic energy
Answer:
Kinetix energy: of an object is the energy that it possesses due to its motion. ( nvm sorry youre working on chemistry)
what enrollment is a girl ridding a bike??
A. nuclear energy
B. thermal energy
A or B
please help me please ❤️❤️
Answer:
It would be thermal energy.
Explanation:
Thermal energy is the energy transfer of heat which is created while doing physical activity.
which of the following are properties of mechanical waves?
