Answer:
Solid argon is stable in the face-centered cubic structure at all temperatures, but it is found that it can also crystallize in a metastable form with hexagonal close-packed structure. ... Small amounts of nitrogen, oxygen, or CO stabilize the hcp phase at temperatures near the melting point.
Explanation:
Jose adds five grams of a chemical to one liter of liquid and observes a reaction. If the reaction is endothermic, what will happen?
A
The liquid's mass increases; therefore, the volume of the liquid will increase
B
The liquids' mass decreases; therefore, the volume of the liquid will decrease.
С
Energy is released during the reaction; therefore, the temperature of the liquid will increase.
Energy is absorbed during the reaction; therefore, the temperature of the liquid will decrease.
D
Answer:
D. Energy is absorbed during the reaction; therefore, the temperature of the liquid will decrease
Explanation:
In a chemical reaction, the reaction is said to be ENDOTHERMIC if the reaction utilizes or uses energy instead of given it off. In this reaction, Jose adds five grams of a chemical to one liter of liquid and observes the reaction.
According to this question, the reaction is ENDOTHERMIC. This means that energy is absorbed or used up during the reaction; therefore, the temperature of the liquid will decrease i.e. the liquid used in the reaction will become COLDER.
Maria wants to determine which type of disinfectant kills the most bacteria.
Which of the following is the best way for Maria to determine this?
A.
Interview ten different people to determine which type of disinfectant they prefer.
B.
Put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate.
C.
Ask ten different companies that make disinfectants which type is best.
D.
Put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.
A I think thats what I would put
Crystallisation is a separation technique used to separate____ solids from a liquid solvent.
Answer:
separate soluble solids from liquid
Explanation:
A in Chemistry
Crystallization is a separation technique used to separate solute solids from a liquid solvent.
What is Crystallization?Crystallization is the process of disuniting or separating two substances or molecules that are mixed, and are of different forms of matter. Such as solid and liquid. The process separates mixtures by three processes. These processes are freezing, precipitation, and deposition.
It is the main process of separating solid from liquid. In this process, the solute came above the liquid in crystal form and this is called precipitation.
Freezing separates the substance that has a different freezing point. By deposition, the substance that is solid and called solute is deposited below the liquid in the container.
Thus, crystallization separates the solute solids from a liquid solvent.
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2
A train travels 25 km in 0.5 hrs. How fast is the train going?
Answer:
15
Explanation:
Answer:
50 km/h
Explanation:
Since in half an hour it has gone 25km, double that (25 x 2) and you get your answer in km/h. Therefore, the train is going 50km/h.
In an isotope, what does the 'u' stand for?
For example: Lithium isotope: Li-6 6u
The u after 6
Electron Dot Structures
Draw the electron dot structures for the following elements:
Magnesium (Mg)
Lithium (Li)
Argon (Ar)
Carbon (C)
Sulfur (S)
Helium (He)
Aluminum (Al)
Nitrogen (N)
Silicon (Si)
Hydrogen (H)
Calcium (Ca)
Neon (Ne)
Potassium (K)
Boron (B)
Chlorine (Cl)
Answer:
surf (S)
tide (T)
champion (C)
Explanation:
wag mo nlng pansinin
Question 3 (4 points)
A dipole bond is formed when electrons are not shared equally in a covalent bond, resulting in a partial negative charge on one end of the
molecule and a partial positve charge on the other end.
O True
O False
A basketball weighs approximately 1.35 kg. What is this mass in grams (g)?
step by step
Answer:
1350 g
Explanation: just add a 0
2.18 x 10^6 ng = 2.18 x 10^? mg
Answer:
2.18 * 10^12 mg
Explanation:
1 nanogram [ng] = 10^6 milligram [mg]
2.18 * 10^6 ng/ 1 ng = X mg / 10^6 mg
X mg = 2.18 * 10^12 mg
Answer:
2.18 * 10^12 mg
Explanation
A sample has a PH of 4, and another sample has a PH of 9. Which sub is the base? How many times basic is it??
Answer:
the first one
Explanation:
the first one is the base because it has a lower PH
Is it true or false??. . .Help me please
Answer:
I think the answer is true
Which of the following is the conjugate acid of H2P04- ?
A. HAP04
O B. PO 3-
O C. HP04-2
O D. H3PO4
Answer:
phosphoric acid H3PO4
The conjugate acid of H₂PO⁴⁻ is H₃PO₄. Therefore, option D is correct.
A conjugate acid is a species that is formed when a base accepts a proton (H⁺). It is the species that is one proton (H⁺) more acidic than the original base.
The base is the species that can accept a proton (H⁺), and the conjugate acid is the species that is formed when the base accepts the proton. The conjugate acid has one additional proton compared to the base.
Conjugate acids play an important role in acid-base reactions as they are formed when bases accept protons, and they can donate protons in subsequent reactions to regenerate the original base.
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What volume of O2 would be required to react with 4.6 grams of Na
Volume of O₂ = 1.12 L
Further explanationThe reaction equation is the chemical formula of reagents and product substances
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
Reaction
4Na+O₂ ⇒ 2Na₂O
Ar Na = 23 g/mol
mol Na :[tex]\tt mol=\dfrac{4.6}{23}=0.2[/tex]
mol O₂ :[tex]\tt \dfrac{1}{4}\times 0.2=0.05[/tex]
Assume at STP (0 C, 1 atm), 22.4 L for 1 mol , then volume of O₂ :
[tex]\tt 0.05\times 22.4=1.12~L[/tex]
The elements least likely to form bonds are found in which group? 15 16 17 18
Answer:
i think 15 but dont get mad if not (❁´◡`❁)
Explanation:
Answer:
The answer is 18
Explanation:sorry if im wrong TwT
If we know the force of an object in Newtons) and we know how fast the object accelerates in ms"), then we can easily find the mass of the object by
dividing the _ by the _
Answer:
If we know the force of an object in Newtons) and we know how fast the object accelerates in ms"), then we can easily find the mass of the object by
dividing the force by the mass
Can you tell me the Valence Electron of each element?
Answer:
Lithium oxide.......................
Explanation:
6. magnicium chloride
2.Barium chloride
3. calcium nitride
4. lithium oxide
5. Aluminium sulphide
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how many molecules are in 3.40L of H2O vapor at STP?*
Answer:
9.14 x 10^22 molecules
Explanation:
The unit for force is kg m/s.
True Or false?
Please answer correctly !!!!!!! Will mark brainliest !!!!!!!!!!!!
I beleive it would be 0.8
the volume of water alone is 4.8
the volume of rock and water is 5.6
you would subtract them both to find the volume of the Rock.
Convert 49 lbs into grams
To get an approximate result, multiply the mass value by 454.
hope this help!
Convert the following to Celsius
16) 100°K
17) 200°K
18) 273°K
19) 350°K
Answer:
16) -173.15cel
17)-73.15cel
18)-0.15
19)76.85
Explanation:
I converted kelvins to cel
Brainly pls
Calculate the entropy change when 4.31 g of H2 reacts with O2 according to the reaction
2 H2(g) + O2(g) → 2 H2O(l)
at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(l) at 298 K is −285.8 kJ/mol. The corresponding free energy of formation is −237.2 kJ/mol.
Answer in units of J/K.
Answer:
Explanation:
ΔG = Δ H - T ΔS
Given , ΔG = -237.2 kJ / mol
Δ H = - 285.8 kJ / mol
T = 298
Putting the values in the equation
-237.2 = - 285.8 - 298 x ΔS
ΔS = .163 kJ / mole K
moles of water formed = 4.31 / 2 = 2.155
entropy change required = 2.155 x .163 kJ / K
= 351.26 J / K .
A car travels at 35.0 mi/hr. How far has it gone in 2455 seconds?
Answer:
The answer is 23.8 milesExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × timeFrom the question
velocity = 35.0 mi/hr
time = 2455 s = 0.68 hr
We have
distance = 35 × 0.68
We have the final answer as
23.8 milesHope this helps you
A black hole is a
a. an object of zero volume and infinite density
b. an object from which nothing, not even light, can escape
c. an object that emits x rays as matter falls into it
d. an object that disappears from our universe
e. all of the above
Answer:
B. an object from which nothing, not even light, can escape
Explanation:
The hybrid orbitals of a molecule are shown in the figure.
These hybrid orbitals were most likely formed by mixing
one s orbital and one p orbital.
one s orbital and two p orbitals.
one s orbital and three p orbitals.
O two s orbitals and two p orbitals.
Answer:
One s orbital and One p orbital
Explanation:
What part of the atom is responsible for the behavior of the alpha particles?
Answer:
nucleus
Alpha particles are subatomic fragments consisting of two neutrons and two protons. Alpha radiation occurs when the nucleus of an atom becomes unstable (the ratio of neutrons to protons is too low) and alpha particles are emitted to restore balance.
Explanation:
How is the human body like a stone arch?
Answer:
It is like an arch because it bends horizontal just like we do and the legs of the arch support the stone like our feet and legs support the weight of us.
Explanation:
How can charged objects interact without touching
What mass of ethanol will All
a 250.0 ml container if its
density is 0.789 g/ml?
Answer:
The answer is 197.25 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 250 mL
density = 0.789 g/ml
So we have
mass = 250 × 0.789
We have the final answer as
197.25 gHope this helps you
All covalent compounds donot exist as giant aggregates. Why?