what elements make up duralumin( an alloy)?
Answer:
In addition to aluminium, the main materials in duralumin are copper, manganese and magnesium.
Answer:
The original composition has been varied for particular applications; it may contain about 4 percent copper, 0.5–1 percent manganese, 0.5–1.5 percent magnesium, and, in some formulations, some silicon.
Which is located inside the lung?
Answer:what are the options????
Explanation:
Answer:
D. The Alveoli.
Explanation:
A scientist is considering formaldehyde (HCHO) for use in an experiment. She is studying the strength of triple bonds in molecules. Is
ormaldehyde a good choice for her to use? Why?
A. Yes, HCHO has three triple bonds.
B. Yes, HCHO has one triple bond.
C. No, HCHO has a double bond but no triple bonds.
D. No, HCHO has only single bonds.
We must __________ forces to calculate net force if the forces are going in OPPOSITE directions.
options:
add
or
subtract
Answer:
subtract
Explanation:
To find the net force of two bodies going in opposite directions, we must subtract the forces this is because they are not additive forces.
The net force is the resultant force acting on a body. This resultant force is the single force that will produce the same effects as all given forces. When forces are directed oppositely on a body, they are subtracted from each other to find the net force.Explain the humoral theory
Answer:
The medical philosophy of the ancient Greeks in which the state of health and disease was determined by the four body “humours”—blood, yellow and black bile, and phlegm—and their relationships with the four elemental humours—air, fire, earth and water. Segen's Medical Dictionary.
Explanation:
A 7-kg bowling ball is rolled down a lane while a 10-kg cart remains at rest. Which has the greatest inertia?
Im sorry but I have the same question tell me when you figure it out please
Is it A, B, C, or D?????
please help!!!!
Answer:
d
Explanation:
Answer:
Its d
Explanation:
Ik you already know this, I just wanted the points tbh
A solution is made by mixing of water and of acetic acid . Calculate the mole fraction of water in this solution. Be sure your answer has the correct number of significant digits.
Answer:
The answer is "0.35".
Explanation:
please find the complete question in the attached file.
Mass of [tex]CH_3C0_2 H[/tex][tex]= 77 \ g \\\\[/tex]
Molar mass of [tex]CH_3C0_2 H[/tex] [tex]= 60.05 \ \frac{g}{mol} \\\\[/tex]
No of moles in [tex]n_{CH_3CO_2H}[/tex] [tex]= 77 \ g \times \frac{1 \ mol \ CH_3C0_2H}{60.05 \ g}[/tex]
[tex]= 1.28 \ mol \ CH_3CO_2H[/tex]
Mass of water [tex](H_2O)[/tex][tex]= 42 \ g[/tex]
The molar mass of water [tex](H_2O)[/tex][tex]= 18.02 \ \frac{g}{mol}[/tex]
moles of water [tex]n_{H_2O}[/tex]:
[tex]= 42 \ g \times \frac{1 mol H_2O}{18.02 \ g} \\\\= 2.33 \ mol \ H_2 O[/tex]
Molfraction of acetic acid:
[tex]X CH_2CO_2H = \frac{n_{CH_3CO_2H}}{n_CH_3CO_2H +n_{H_2}}\\\\[/tex]
[tex]=\frac{1.28 \ mol}{1.28 \ mo1 + 2.33 mol}\\\\ = 0.354\\\\= 0.35[/tex]
Which pattern on the periodic table is correctly predicted below?
Groups determine the number of valance electrons and periods determine the number of energy levels
Groups determine the number of energy levels and periods determine the number of valence electrons
Groups determine the number of protons, and periods determine energy levels
Groups determine the number of neutrons, and periods determine valence
Plzz
What characteristic of life is demonstrated by maintaining a stable pH?
Answer:
Living Things Maintain Stable Internal Conditions When any living organism gets thrown off balance, its body or cells help it return to normal. In other words, living organisms have the ability to keep a stable internal environment. Maintaining a balance inside the body or cells of organisms is known as homeostasis.
Explanation:
Which one of the following is NOT a proper unit for frequency? *
m·s–1
Hz
s–1
1/s
Answer:
m*s⁻¹.
Explanation:
Hello!
In this case, since the frequency measures how repetitive an event is per unit of time, for instance the laps a car drives every 5 minutes or something similar, we can infer it has units of event/time; in such a way, the unit m*s⁻¹ is not a proper unit of frequency because it is a proper unit of velocity which is the distance traveled per unit of time.
In such a way, Hz (hertz), s⁻¹ and 1/s are possible ways frequency can be represented.
Best regards!
The density of ethanol, C 2H 5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 25.0 g of CO 2 according to the following chemical equation?
C 2H 5OH( l) + 3 O 2( g) → 2 CO 2( g) + 3 H 2O( l)
Answer:
11.1mL
Explanation:
The reaction expression is given as:
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
Given parameters:
density of ethanol = 0.789g/mL
mass of CO₂ = 25g
Unknown:
Volume of ethanol = ?
Solution:
First find the number of moles of the CO₂ from the given mass;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Number of moles = [tex]\frac{25}{44}[/tex] = 0.57mol
Then;
Find the number of moles of ethanol used;
3 moles of CO₂ is produced from 1 mole of ethanol;
0.57mole of CO₂ will be produced from [tex]\frac{0.57}{3}[/tex] = 0.19mole of ethanol
Now;
Find the mass of the ethanol from the given mole;
Mass of ethanol = number of moles x molar mass
Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol
Mass of ethanol = 0.19 x 46 = 8.74g
Then;
Density is the mass per unit volume of a substance;
Density = [tex]\frac{mass}{volume}[/tex]
Volume = [tex]\frac{mass}{density}[/tex]
Volume = [tex]\frac{8.74}{0.789}[/tex] = 11.1mL
which of the elements below has a smaller atomic radius. element1: 1s2 2s2 2p4 element2: 1s2 2s2 2p5
Answer:
both are same give different number
What force is causing The object to eventually stop moving
Answer:
Hey buddy, here is your answer. Hope it helps you.
Explanation:
The force stopping the object's motion might be an obvious one - the ground! Friction is a force that slows or stops motion. Friction is the resistance to motion created by two objects rubbing against each other (the sled and the snow, for instance). Even air causes friction.
predict how many moles of nh3 would be made if 6.00 moles of h2 were used N2
Answer:
4 moles
Explanation:
The equation is 3H2 + N2 → 2NH3
so the ratio of moles would be
2:3 or 2/3
so 6*2/3 which is 4
hope this helped.
Answer:
4moles
Explanation:
Given parameters:
Number of moles of H₂ used = 6moles
Equation of the reaction:
N₂ + 3H₂ → 2NH₃
3 mole of H₂ was used to produce 2 mole of NH₃;
6 mole of H₂ will produce [tex]\frac{6x2}{3}[/tex] = 4 moles of NH₃
The number of moles of NH₃ produced is 4moles
Which material is found in asteroids?
Answer:
Asteroids are made of rock, metals, and other elements. Some even contain water. Asteroids that are mostly stone sometimes are more likely to lose piles of rubble. Asteroids that are mostly iron are more rock-solid.
Explanation:
Answer:
asteriods are made of rocks. asteroids that are mostly iron are more, well, rock-solid
Explanation:
Which of these Is NOT a chemical bond?
Metallic bon
Covalent bond
lonic bond
Molecule bond
Answer: The answer is Molecule bond.
1 point
Which element requires the least amount of energy to remove its valence electron(s)?
barium
chlorine
oxygen
carbon
PLEASE HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which of the following does NOT increase with increasing temperature?
a kinetic energy
b thermal energy
c potential energy
d none of the above
Answer:
Explanation:
Potential energy
How do you calculate the volume of a cube? A. with a graduated cylindar in mL? B. with a triple beam balance in g? C. with a beaker in mL? D. with a ruler in cm3?
Answer:
B
Explanation:
triple beam balance
sorry if i am wrong! can be brainliest?
Why is honesty important?
Honesty leads to a fulfilling, free life. Honesty is not just about telling the truth. It's about being real with yourself and others about who you are, what you want and what you need to live your most authentic life. ... Honesty sharpens our perception and allows us to observe everything around us with clarity.
(brainliest plz)
Which method of heat transfer allows you to fry an egg in a frying pan on the stove?
Answer:
Conduction
Explanation:
Answer:
Conduction is correct
Explanation:
How many orbitals in an atom can have each of the following designations?
(a) 4s
(b) 5f
(c) 6p
(d) n=1
In metallic bonds, the mobile electrons surrounding the positive ions are called a(n)
Why do gases diffuse more quickly than liquids?
Choose the correct answer.
A) Liquids can be compressed easily.
B)The particles in gases are not mobile.
C)Liquids are always at lower temperatures than gases.
D)Gas particles move rapidly and have space between them.
Answer:
D)Gas particles move rapidly and have space between them.
Explanation:
Matter exists in three states namely: solids, liquids and gases. The particles contained in these three states are different from one another. In the gaseous state, the particles are FAR APART from one another i.e. space exists and they move at a very fast rate in contrast to the particles of a liquid, which have less space and move slower.
This rapid movement of gas particles within a less restricted space accounts for the reason why gaseous substances DIFFUSE more quickly than liquids.
Gustavo and Beatriz are pushing on a door in opposite
directions. If the door does not move, the forces are
The net force in this scenario would be Answer: balanced and zero
Answer:
Correct
Explanation:
Balanced forces are always zero!
Answer:
Balanced
Zero
Explanation:
What color do you get if you mix red and blue light?
Red and Green?
Blue and green?
What relationship do you find between frequency and energy?
What relationship do you find between wavelength and current flow?
What relationship do you find between light intensity and current flow?
Answer:
Purple light.
Yellow light.
Explanation:
Matter is anything that has mass and takes up space (volume). How does volume change as matter changes state?
A. The density of matter remains the same, only energy of the atoms changes.
B. matter becomes more dense as it moves from solid to gas
C. Matter becomes less dense as it moves from gas to solid state
D. Matter becomes more dense as it moves from gas to solid state
Answer: D) Matter becomes more dense as it moves from gas to solid state
A gas expands to fill up the container of whatever shape or size. As it cools to a solid, the molecules get closer together and don't move as much (the molecules still will vibrate and move somewhat even in solid form). So effectively the volume of the object shrinks while the amount of mass stays the same. This is why the density increases when going from gas to solid.
what mass of calcium chloride will be produced from 3.750 moles of hcl reacting with ca(oh)2
Answer:
208.125g
Explanation:
Given parameters:
Number of moles of HCl = 3.75moles
Unknown:
Mass of CaCl₂ that will be produced = ?
Solution:
The reaction equation is given as:
2HCl + Ca(OH)₂ → CaCl₂ + 2H₂O
Now, to find the mass of CaCl₂, we have to work from the known to the unknown.
The known specie here is the number of moles of HCl;
2 mole of HCl will produce 1 mole of CaCl₂
3.75moles of HCl will produce [tex]\frac{3.75}{2}[/tex] = 1.875moles
The mass of CaCl₂;
Mass of CaCl₂ = number of moles of CaCl₂ x molar mass
Molar mass of CaCl₂ = 40 + 2(35.5) = 111g/mol
Mass of CaCl₂ = 1.875 x 111 = 208.125g
The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group?
Characteristics of a group of elements
•is shiny
•is solid at room temperature
•has atoms with two valence electrons
A-silicone
B-lithium
C-strontium
D-aluminum
Answer:
C:Strontium
Explanation:
