Answer:
I believe the answer is A
what do molecules and elements have in common
Answer:
They both are made up of atoms and having bonds linking their atoms together.molecules and compounds also share the qualities of being both pure and homogeneous substances.
Explanation:
Hope this helped!!!
Is the formation of CO2(g) from its elements endothermic or exothermic?
Exothermic because the ΔH is negative.
Endothermic because the ΔH is negative.
Endothermic because the ΔH is positive.
Exothermic because the ΔH is positive.
. What is the OH- concentration of a neutral solution?
A neutral solution is one that is neither acidic nor basic. The hydrogen ion concentration equals the hydroxide ion concentration, and both equal 1 X 10-7 M. In a neutral solution, then, pH = pOH = 7.
A balloon has a volume of 5.0 L at a pressure of 0.863 atm. What is the volume of the balloon in
liters if the atmospheric pressure is reduced to 0.321 atm?
Answer:
V₂ = 13.44 L
Explanation:
Given that,
Initial volume, V₁ = 5 L
Initial pressure, P₁ = 0.863 atm
Final pressure, P₂ = 0.321 atm
We need to find the final volume of the balloon. The relation between the volume and pressure is given by :
[tex]P_1V_1=P_2V_2[/tex]
Where
V₂ is the volume of the balloon
So,
[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{0.863 \times 5}{0.321 }\\\\V_2=13.44\ L[/tex]
So, the final volume of the balloon is equal to 13.44 L.
How many atoms of aluminium are contained in 2.75 mol
1.66 × 10²⁴ atoms Al
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 2.75 mol Al
[Solve] atoms Al
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 2.75 \ mol \ Al(\frac{6.022 \cdot 10^{23} \ atoms \ Al}{1 \ mol \ Al})[/tex][DA] Multiply [Cancel out units]: [tex]\displaystyle 1.65605 \cdot 10^{24} \ atoms \ Al[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.65605 × 10²⁴ atoms Al ≈ 1.66 × 10²⁴ atoms Al
HELP ASAP!!!!
Identify each substance as a molecular compound or an
ionic compound, and then calculate its molar mass.
a. Sr(NO3)2
b. (NH)3PO4 C. C12H22O11
Answer:
a. ionic, 211.62g/mol
b. molecular, 149g/mol
c. molecular, 342g/mol
Explanation:
Ionic Compound: These are compounds (2 or more elements) where atoms of the element have lost or gained electrons, thus they are ions, thus the name ionic. An easy way to identify ionic compounds is to see if there are any metals. Metals tend to give up their electron to a non-metal. It maybe helpful to familiarize which parts of the periodic table have metals and non-metals.
Molecular Compounds: These are compounds (2 or more elements) that are neutral. An easy way to identify them is that the compound is made up of just non-metals.
Molar Mass is the masses of each individual element in the compound. Refer to the periodic table for the masses and add them up carefully, remember to multiply their mass based on how many molecules there are in the compound, like for a, we can find the mass of NO3, but we need to multiply it by 2 since we have 2 molecules of NO3.
a. Sr(NO3)2
Sr= 87.62
NO3= 14 + (3 x 16)= 62
Sr + 2 (NO3)
87.62 + (2 x 62)= 211.6
b. (NH4)3PO4
NH4= 14 + 4 = 18
PO4= 30.97 + (4 x 16)= 94.9
(NH4 x 3) + PO4
(18 x 3) + 94.9 = 149
c. C12H22O11
(12 x C) + (22 x H) + (11 x O)
(12 x 12) + (22 x 1) + (11 x 16)
144 + 22 + 176= 342
What is the complete ionic equation for Hydrochloric acid and sodium hydroxide
Hydrochloric acid: HCl(aq)
Sodium hydroxide: NaOH(aq)
The two substances react in an acid-base neutralization reaction to produce aqueous sodium chloride and liquid water.
The complete ionic equation is:
H⁺(aq) + Cl⁻(aq) + Na⁺(aq) + OH⁻(aq) → Na⁺(aq) + Cl⁻(aq) + H₂O(l).
Can someone help me plss
Answer:
the 3rd option is correct I promise
Explanation:
matter can not be created or destroyed no matter what, most important rule is chemistry
Thermal energy added to a substance that is not changing state causes the substance’s temperature to
Group of answer choices
decrease.
increase
remain unchanged
vary unpredictably
Answer:
increase
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction. Conductors include metal, steel, aluminum, copper, frying pan, pot, spoon etc.
In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.
Hence, thermal energy added to a substance that is not changing state causes the substance’s temperature to increase because it would absorb energy in the form of heat.
5.
Cr(NO3)3 (aq)
+
Ba (s)
Complete lonic:
I
Net lonic:
Answer:
Complete ionic: 2Cr(3+) + 6(NO3)- + 3Ba = 2Cr + 3Ba(2+) + 6(NO3)-
Net ionic; 2Cr(3+) + 3Ba = 2Cr + 3Ba(2+)
Explanation:
We are given;
Cr(NO3)3 (aq) + Ba (s)
Let's first find the product of this reaction before getting the complete and net ionic equations.
2Cr(NO3)3 + 3Ba = 2Cr + 3Ba(NO3)2
The complete ionic equation will be;
2Cr(3+) + 6(NO3)- + 3Ba = 2Cr + 3Ba(2+) + 6(NO3)-
The net ionic equation is gotten by eliminating the spectator ions from both left and right hand sides of the equation.
Thus, net ionic equation is;
2Cr(3+) + 3Ba = 2Cr + 3Ba(2+)
Plz help I need help plz
How many moles are in 56.7g of Fe?
Answer: n= 1.02 moles
Explanation: relative atomic mass of Fe is 55.85.
Amount of substance n= m/M = 56.7 g /55.85 g/mol
density is the ratio of mass per unit volume. fact or bluff
Answer:
Fact
Explanation:
Lithium nitride LiN LiN3 Li3N
Answer:
Li3N
Explanation:
Lithium nitride is a compound with the formula Li₃N
Hope this helped!!!
Answer:
C
the next answer is B
the next one is C
Explanation:
In a single carbon bond, two carbon atoms share
pair of electrons.
Answer:
C-C
A carbon has 4 valence electrons meaning it can share 4 electrons and is in short of 4 electrons to fill it outer energy shell making it 8. Which results to 2 double covalent bonds ,meaning there was a sharing of 2(4) = 8 electrons . Hope this helps . Your statement above is true .
Which statement correctly describes a solution
with a pH value of 10?
a. It would turn litmus red.
b. It would turn methyl orange red.
c. It would turn thymol blue yellow.
d. It would turn phenolphthalein pink.
Answer:
d. It would turn phenolphthalein pink.
Explanation:
If you traveled 25 meters in 100 seconds, what is your speed?
.25 meters per second
25/100
.25
100/100
1
A sample of gas has a pressure of 100.0 KPa and 25C. Calculate the pressure if the temperature is changed to 125C while the volume remains constant.
Answer:
133.56kPa
Explanation:
Applying Pressure Law,
P/T = P'/T'....................... Equation 1
Where P = Initial pressure, T = Initial Temperature, P' = Final pressure, T' = Final Temperature.
From the question, we were asked to calculate P'
There, we make P' the subject of the equation
P' = PT'/T...................... Equation 2
Given: P = 100kPa, T = 25°C = (273+25) = 298K, T' = 125°C = (273+1250K = 398 K
Substitute these values into equation 2
P' = (100×398)/298
P' = 133.56kPa
Hence the pressure is 133.56kPa
difference between electroplating and sacrificial protection
Answer:
Explanation:
Sacrificial protection is a corrosion protection method in which a more electrochemically active metal is electrically attached to a less active metal. The highly active metal donates electrons to replace those which may have been lost during oxidation of the protected metal.
Electroplating is a general name for processes that create a metal coating on a solid substrate through the reduction of cations of that metal by means of a direct electric current. The part to be coated acts as the cathode (negative electrode) of an electrolytic cell; the electrolyte is a solution of a salt of the metal to be coated; and the anode (positive electrode) is usually either a block of that metal, or of some inert conductive material. The current is provided by an external power supply.
The table shows four solutions that were prepared by
dissolving salt in water.
Solution
Mass of NaCl Volume of Water
(g)
(mL)
A
5.0
50.0
B
5.0
75.0
С
5.0
100.0
D
5.0
125.0
Which of the solutions has the highest salt
concentration?
O A. Solution B
OB. Solution D
O C. Solution C
O D. Solution A
Answer:
a
Explanation:
The solution that has the highest concentration given the data is solution A ( Option D)
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of NaCl Mass of solute = 5 g Molar mass of NaCl = 58.5 g/mol Mole of NaCl =?Mole = mass / molar mass
Mole of NaCl = 5 / 58.5
Mole of NaCl = 0.085 mole
How to determine the molarity of solution AMole of NaCl = 0.085 mole Volume = 50 mL = 50 / 1000 = 0.05 L Molarity of solution A =?Molarity = mole / Volume
Molarity of solution A = 0.085 / 0.05
Molarity of solution A = 1.7 M
How to determine the molarity of solution BMole of NaCl = 0.085 mole Volume = 75 mL = 75 / 1000 = 0.075 L Molarity of solution B =?Molarity = mole / Volume
Molarity of solution B = 0.085 / 0.075
Molarity of solution B = 1.13 M
How to determine the molarity of solution CMole of NaCl = 0.085 mole Volume = 100 mL = 100 / 1000 = 0.1 L Molarity of solution C =?Molarity = mole / Volume
Molarity of solution C = 0.085 / 0.1
Molarity of solution C = 0.85 M
How to determine the molarity of solution DMole of NaCl = 0.085 mole Volume = 125 mL = 125 / 1000 = 0.125 L Molarity of solution D =?Molarity = mole / Volume
Molarity of solution D = 0.085 / 0.125
Molarity of solution D = 0.68 M
SUMMARY
Molarity of solution A = 1.7 MMolarity of solution B = 1.13 MMolarity of solution C = 0.85 MMolarity of solution D = 0.68 MThus, solution A has the highest concentration of the salt.
Learn more about molarity:
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WILL GIVE BRANLIEST!! EASY BUT I WAS TO LAZY TO LEARN!! WILL FOREVER BE GREATFUL!!!
2. Which type of solution below has a cloudy appearance? (Choose all that apply)
A) Alloys
B) Solutions
C) Colloids
D) Suspensions
4. What is the difference between a primitive and body centered unit cell?
Answer:
b and In a primitive unit cell, particles or points are present only at the corners while in a centred unit cell, the particles or points are also present at other positions in addition to the corner
Explanation:
Three moles of oxygen gas is stored in a 2.5-liter container at 35°C. What is the pressure of this gas?
Answer:
The pressure of the gas is 30.3072 atm.
Explanation:
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case:
P= ?V= 2.5 Ln= 3 molesR= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= 35 C= 308 K (being 0 C= 273 K)Replacing:
P* 2.5 L= 3 moles* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] *308 K
Solving:
[tex]P=\frac{ 3 moles* 0.082 \frac{atm*L}{mol*K} *308 K}{2.5 L}[/tex]
P= 30.3072 atm
The pressure of the gas is 30.3072 atm.
1. How is extinction different from mass extinction?
Answer:
Extinction is the elimination of one species whereas mass extinction results in multiple animals to become extinct.
If a young girl learned that it would be 0° C, or 32° F, the next
day then what kind of weather should she expect?
Answer:
Cold
Explanation:
Because 0°C And below or 32°F Refers To Cold Weather
mass of 12 helium atom
Which equation represents a fusion reaction?
Please answer asap
(Look at picture)
Answer:c
Explanation:
Help, please :)
What type of bond is being shown here?
A. Single covalent
B. Double covalent
C. Triple covalent
D. None
Answer:
Double bond, Double Covalent
Explanation:
Hope this helps!
Question 2 1P Which of the following combinations does not include any state functions? volume, work. temperature, work, pressure, temperature. work, heat
H2SO4 + 2 NaOH →
Na2SO4 + 2 H20
What mass of H2SO4 would be required to react with 2.25 mol of NaOH?
Answer:
110.25grams
Explanation:
The balanced chemical equation is as follows:
H2SO4 + 2NaOH → Na2SO4 + 2H20
Based on the balanced chemical equation of the reaction given above, 1 mole of sulphuric acid (H2SO4) is required to react with 2 moles of sodium hydroxide (NaOH).
Hence, if 1 mol of H2SO4 is needed to react with 2 moles of NaOH
Then, 2.25mol of NaOH will be required to react with;
= 2.25/2
= 1.125mol of H2SO4
Using the formula, mole = mass/molar mass, we can convert the molar value of H2SO4 to its mass value.
Molar mass of H2SO4 = 1(2) + 32 + 16(4)
= 2 + 32 + 64
= 34 + 64
= 98g/mol
Therefore, mole = mass/molar mass
1.125 = mass/98
mass = 98 × 1.125
mass = 110.25grams of H2SO4
Which is the reactant - and why?
Explanation:
The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction