Answer:
See explanation.
Explanation:
Kilo = 1000
Hecto = 100
Deca = 10
Base Unit = 1
Deci = 10
Centi = 100
Milli = 1000
A Chemist reacted magnesium and aluminum oxide. A reaction takes place. Explain why
Explanation:
when Magnesium is reacted with Aluminum oxide, Aluminum being a less reactive metal than magnesium, is replaced by magnesium
Al2O3 + 3Mg - 3MgO + 2Al
hence reaction takes place
Angela does 50 Joules of work to lift her 2.5 kg grocery bag. How far (distance) did she lift the grocery bags?
Which factor will INCREASE the rate of solvation of a solid in a liquid?
A. decreasing the surface area of the solute
B. decreasing the temperature
C. allowing the mixture to sit undisturbed
D. increasing the temperature
(It’s D)
Answer:
the answer is D =decreasing the temperature ️️️
What is the pressure of gas at 496 Liters and 200 Kelvin if the original pressure was 0.250 atm. at 300 liters and 400 kelvin?
Answer:
0.076 atm
Explanation:
Using the combined gas law formula;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
T1 = initial temperature (K)
T2 = final temperature (K)
V1 = initial volume (L)
V2 = final volume (L)
According to the information provided in this question;
P2 = ?
P1 = 0.250 atm
V2 = 496 L
V1 = 300 L
T2 = 200K
T1 = 400K
Using P1V1/T1 = P2V2/T2
0.250 × 300/400 = P2 × 496/200
75/400 = 496 P2/200
0.1875 = 2.48P2
P2 = 0.1875 ÷ 2.48
P2 = 0.076 atm
How many moles is 17.6 g NaOH?
a
0.567 mol NaOH
b 227 mol NaOH
C
0.704 mol NaOH
d 0.440 mol NaOH
Answer:
[tex]\boxed {\boxed {\sf D. 0.440 \ mol \ NaOH}}[/tex]
Explanation:
To convert from moles to grams, the molar mass is used (mass of 1 mole). The values are the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units.
1. Molar MassWe are given the compound sodium hydroxide (NaOH) and we need to look up the molar masses of the individual elements.
Na: 22.9897693 g/mol O: 15.999 g/molH: 1.008 g/molThe formula for the compound has no subscripts, so there is 1 mole of each element in 1 mole of the substance. We can simply add the molar masses.
NaOH: 22.9897693 + 15.999 + 1.008 = 39.9967693 g/molThis means there are 39.9967693 grams of sodium hydroxide in 1 mole.
2. Convert Grams to MolesUse the molar mass we found as a ratio.
[tex]\frac {39.9967693 \ g \ NaOH}{ 1 \ mol \ NaOH}[/tex]
Since we are converting 17.6 grams of NaOH to moles, we multiply by this value.
[tex]17.6 \ g\ NaOH *\frac {39.9967693 \ g \ NaOH}{ 1 \ mol \ NaOH}[/tex]
Flip the ratio so the units of grams of NaOH cancel.
[tex]17.6 \ g\ NaOH *\frac {1 \ mol \ NaOH}{ 39.9967693 \ g \ NaOH}[/tex]
[tex]17.6 *\frac {1 \ mol \ NaOH}{ 39.9967693}[/tex]
[tex]\frac{17.6 }{ 39.9967693} \ mol \ NaOH[/tex]
[tex]0.4400355406 \ mol \ NaOH[/tex]
3. RoundThe original measurement of grams has 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.
0.4400355406The 0 in the ten thousandths place (in bold above) tells us to leave the 0 in the thousandth place.
[tex]0.440 \ mol \ NaOH[/tex]
17.6 grams of sodium hydroxide are equal to 0.440 moles of sodium hydroxide.
PLEASE HELP NEED ANSWER ASAP!!!!
Use 3 H2(g) + N2(g) <--> 2 NH3 (g) + 92.4 kJ
At equilibrium, if the hydrogen (H2) concentration is increased, the ammonia(NH3) concentration will
Select one:
a. decrease
b. shifts back and forth
c. increase
d. remain the same
Answer:
the correct answer is option A. decrease
Alex cut a pizza into 8 equal slices. He removed 2 of the slices of pizza. What is the measure of the angle made by the missing
Answer: 90 degrees.
Explanation:
what is the formula of acceleration?
Answer:
The formula of acceleration is final velocity-initial velocity÷time taken
Explanation:
v-u/t
Answer:
acceleration = (vFinal − vInitial)/ (tFinal − tInitial) Where v stands for velocity and t stands for time.
A gas has a volume of 300 mL in a rigid container at 50oC and 1.75 atm. What will be its pressure at 100K?
Answer:
Its pressure will be 0.54 atm at 100 K.
Explanation:
Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
Gay-Lussac's law can be expressed mathematically as the quotient between pressure and temperature equal to a constant:
[tex]\frac{P}{T} =k[/tex]
Studying two different states, an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 1.75 atmT1= 50 °C= 323 K (being 0 C=273 K)P2= ?T2= 100 KReplacing:
[tex]\frac{1.75 atm}{323 K} =\frac{P2}{100 K}[/tex]
Solving:
[tex]P2= 100 k*\frac{1.75 atm}{323 K}[/tex]
P2= 0.54 atm
Its pressure will be 0.54 atm at 100 K.
Balance the chemical equation using the drop-down options.
CaC2 +
A H20 --->
Ca(OH)2
A C2H2 +
Answer:
CaC2 + 2H20 ⇋Ca(OH)2 + C2H2
Explanation:
CaC2 + A H20 ---> Ca(OH)2 + A C2H2
This is calcium carbide reacting with water to produce calcium hydroxide and ethyne commonly called acetylene.
Let's now balance the equation.
CaC2 + 2H20 ⇋Ca(OH)2 + C2H2
Prokaryotic and eukaryotic cells have many different characteristics. One difference
between prokaryotic and eukaryotic cells is that all eukaryotic cells —
Answer:
Have a nucleus
Explanation:
Pls check..
El modelo atómico postulado por Shrodinger refiere la corteza atómica como una nube electrónica. Verdadero. Falso.
Answer:
Falso.
Explanation:
El modelo cuántico (no relativista) de Schrodinger, piensa a los electrones como ondas estacionarias, tal que la amplitud de dichas ondas decae muy rápidamente cuando se "alejaban" del radio atómico. (Es decir, habia poca probabilidad de que los electrones escaparan del radio atomico, y era por ello que se quedaban orbitando cerca del nucleo). Es decir, podríamos pensar en esto como una "nube de probabilidades" más que una nube electronica
La idea de nube electrónica realmente viene de modelos previos, como el de Rutherford o el de Bhor, los cuales eran modelos clásicos.
Which reaction demonstrates bonds breaking?
PC13(g) → P (g) + 3Cl (g)
P(g) + 3 Cl(g)
PC13 (g)
The percent composition for NaHCO3 ?
Answer:
23.20% Na, 4.26% H, 18.41% C, and 54.13% O.
Explanation:
Hope this helped Mark BRAINLIEST!!!!
Answer:
Sodium Na 27.367%
Hydrogen H 1.200%
Carbon C 14.297%
Oxygen O 57.136%
This compound is also known as Baking Soda or Sodium Bicarbonate.
i need help with this asap.
Answer:
H30+ First H20 Second N03 Third HNO3 Fourth
Explanation:
Please help me ASAP!!!!
Answer:
Explanation:
Determine the balanced chemical equation for the chemical reaction.
Convert all given information into moles (most likely, through the use of molar mass as a conversion factor).
Calculate the mole ratio from the given information.
What volume in milliliters of 6.0 M NaOH is needed to prepare 175mL of 0.20 M NaOH by dilution?
Answer:
V¹N²= V²N²
here V¹= ?
N¹= 6.00
V²= 175ml
M²= 0.2M
So V¹= (V²N²)/N² = (175 x 0.2)/6
V¹ = 5.83 ml
Explanation:
Therefore diluting 5.83 ml of 6.00M NaOH to 175 m l ,we get 0.2M Solution.
5.83 ml of 6.0 M NaOH is required to prepare 175 ml of 0.20 M NaOH by dilution according to the concept of molar concentration.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.For the mentioned example volume of 6 M NaOH is found out as,
M₁V₁=M₂V₂
∴V₁=0.20×175/6=5.83 ml
Thus, 5.83 ml of 6 M NaOH is required to prepare 175 ml of 0.20 M NaOH by dilution.
Learn more about molar concentration,here:
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Which number represents an acidic pH, 3 or 12
Answer:
Explanation:
The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.
Answer:
pH 3
Explanation:
The lower the pH the more acidic. The higher is more bleachier.
Answer the following questions when 45mL sample of 0.175 M KOH is titrated with 0.200 M HI
Find the initial pH of the 0.175 M KOH solution.
Find the pH when 18 mL of 0.200 M HI have been added.
Find the pH when 63 mL of the 0.200 M HI have been added.
How many milliliters of 0.200 M HI must be added to reach the equivalence point?
What is the pH at the equivalence point?
Answer: Initial pH is 13.243
12.83
1.3
40ml
7
Explanation:
Just finished the test.
How many atoms are in one mole of barium ?
Answer:
3 atoms
Explanation:
"In one mole of Barium, there are 3 x [tex]N_{A}[/tex] barium and chlorine atoms, where [tex]N_{A}[/tex] is Avagadro's Number, 6.022 x [tex]10^{23}[/tex] " - anor277 via Socratic
When the temperature of the water was 10°C the waterweed did not produce bubbles.
Suzi increased the temperature of the water in the water-bath to 20°C. The waterweed started to produce bubbles.
She waited two minutes before starting to count the bubbles.
Explain why she waited for two minutes before she started to count the bubbles.
Science
Explanation:
she could waited for the saturated vapour pressure to equal the prevailing atmospheric pressure
ergo boiling to take place seeing as she had gotten the first indication that boiling had started
can someone help me with these pls
Answer:
C is the correct answer
Explanation:
as temperature increases the pressure also increases
A gas diffuses 1/6 times faster than hydrogen gas (H2).
What is the molar mass of the gas? (5 points)
a
59.95 g/mol
b
66.54 g/mol
c
68.68 g/mol
d
72.58 g/mol
Answer:
72.58 g/mol
Explanation:
mark me brainless if I am ✅
The relationship between the rate of diffusion and the molar mass is given by Graham's law. A gas diffusing 1/6 times faster than hydrogen will have a molar mass of 72.58 g/mol. Thus, option d is correct.
What is Graham's law?Graham's law states the inverse relationship between the rate of diffusion and the square root of the molar mass of the gas. It is given as,
Rate = 1 ÷ √M
The molar mass of the gas that diffuses 1/6 times faster than hydrogen is calculated as,
R₁ ÷ R₂ = √ (M₂ ÷ M₁)
Here,
The molar mass of hydrogen = M₁
The molar mass of unknown gas = M₂
Rate of diffusion of hydrogen gas = R₁
Rate of diffusion of unknown gas = R₂ = 1 / 6 R₁
Substituting values:
R₁ ÷ 1/6 R₁ = √M₂ ÷ 2
6 × 1.414
= 8.485
= 84.85 g/mol ≈ 72.58 g/mol
Therefore, option d. 72.58 g/mol is the molar mass of unkown gas.
Learn more about Graham's law here:
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a toy car is place at the top of a ramp and released which situation describes how car energy is transformed
I don’t see a list of differing situations, but I can explain what happens:
Edit (to be more specific):
When you release a toy car on a ramp; the potential energy is at its highest point (with little kinetic energy). As the car accelerates downwards, kinetic energy increases. At the bottom of the ramp, there is minimum potential energy, though maximum kinetic energy.
A titration is completed using 10.0 mL of 0.50 M HCl and an unknown concentration of NaOH solution. If the equivalence point is reached when exactly 20.0 mL of the NaOH solution is added, what must the concentration of the NaOH solution be?
Answer:
0.172 M
Explanation:
You can prepare a buffer solution by combining equal moles of which pair of substances?
A. weak acid and its conjugate base
B. strong acid and a strong base
C. strong base and its conjugate acid
D. salt and a weak acid
Answer:
A. weak acid and its conjugate base
Explanation:
A buffer solution can be made with a weak acid and conjugate base or a weak base and conjugate acid.
This may help you:
https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Acids_and_Bases/Buffers/Introduction_to_Buffers
The chemical equation below represents an unbalanced chemical reaction:
Fe + 0, → Fe,o,
When the equation is balanced, what coefficient is needed for Fe2O3?
A
1
B
2
С
3
D
4
Answer:
2
Explanation:
Definition: This is the energy that comes to Earth from the Sun.
Example: using the sun to dry your laundry hanging on the clothesline
Answer:
well to me it is called natural energy
A big ______ shows up on a weather map as really close/tight isobars & in weather as fast, strong winds
dewpoint
air pressure gradient
precipitation
barometer
Answer:
A BIG DI*CK
Explanation:
Determine the molecular formula of the following: Molar
mass of compound equals 78.11 g/mol and an empirical
formula of CH.
NEED HELP!!
Answer:
C6H6
Explanation:
The molecular formula of a substance can be determined by using the expression:
(CH)n = 78.11g/mol
Where;
C = 12, H = 1
(12 + 1)n = 78.11
13n = 78.11
n = 78.11 ÷ 13
n = 6.008
n = 6
Hence, the molecular formula is as follows:
(CH)6
Molecular formula = C6H6