Sample A has a mass of 40g and a volume of 10cm^3. Sample B has a volume of 15cm^3 and a mass of 45g. Which sample has a greater density? Show your work.
The Answer Is Sample A
Density -
[tex]density = \frac{mass}{volume} [/tex]
Input The Formula For Both Equations To Find Density.
Sample A -
[tex]d = \frac{40}{10} [/tex]
[tex]d = 4[/tex]
Sample B -
[tex]d = \frac{45}{15} [/tex]
[tex]d = 3[/tex]
25 Which factor causes global wind patterns?
A changes in the distance between Earth and the Moon
B unequal heating of Earth's surface by the Sun
C daily changes in the tilt of Earth's axis
D rapid rotation of the Sun on its axis
Answer:
B
Explanation:
what are the numbers of neutrons in hydrogen
Answer:
Hydrogen has 0 neutrons.
Explanation:
You can find the # of neutrons by subtracting the Atomic Mass from the Atomic number. Hydrogen is a special case in which the atom has no neutrons.
How many grams are in 1.52 moles of PC13? (molar mass: 137.33 g/mol)
Air is made of nitrogen, carbon dioxide, and small amounts of other gases. What is the pressure of O₂, total is 1 atm if PN₂ = 593.4 mm Hg, PCO₂ = 3.0 mm Hg, and Pothers = 7.1 mm Hg? *
0.3 atm
0.2 atm
0.4 atm
0.8 atm
Answer:
The pressure of O₂ is 0.8 atm.
Explanation:
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
PT = PA + PB
This relationship is due to the assumption that there are no attractive forces between the gases.
In this case:
PT=Pnitrogen + Pcarbon dioxide + Pother gases
Being:
Pnitrogen: 593.4 mmHg Pcarbon dioxide: 3 mmHgPother gases: 7.1 mmHgand replacing:
PT= 593.4 mmHg + 3 mmHg + 7.1 mmHg
you get:
PT= 603.5 mmHg
Being 760 mmHg= 1 atm, you get:
PT= 603.5 mmHg= 0.8 atm
The pressure of O₂ is 0.8 atm.
What do electrochemical cells use to generate electricity?
Answer:
flow of electrons
Explanation:
took the quiz
Why is KOH considered to be a base? A. It has a high concentration of OH+ ions in solution. B. It has a high concentration of H+ ions in solution. C. It has a high concentration of H- ions in solution. D. It has a high concentration of OH- ions in solution.
Answer:
D. It has a high concentration of OH- ions in solution.
How much does 3 moles of silica weigh
84.2565
Because
1 silica is equal to 28.0855,
times 3 is 84.2565
Which term identifies a type of intermolecular force?
A.
covalent bonding
B.
hydrogen bonding
C.
ionic bonding
D.
metallic bonding
Answer: B. Hydrogen Bonding
Explanation: I got it right on castle learning lol
There are different kinds of forces. The term that identifies a type of intermolecular force is hydrogen bonding.
The three known to be types of intermolecular interactions. They are
Dipole–dipole interactions London dispersion forces hydrogen bonds.
Hydrogen bonding is known to be an intermolecular force that takes place between two molecules. That molecule is known to have a hydrogen atom be bonded to a nitrogen, oxygen, or fluorine atom.
Learn more about Bond from
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Calculate the percent ionization of a 0.381 M solution of hydrocyanic acid.
Answer:
.00402 %
Explanation:
hydrocyanic acid (HCN) is a weak acid with a Ka of 6.17*10^-10 so you need to do a RICE table
initial concentration of HCN is .381 and initial H+ and CN- concentration is 0.
that means the equillibrium concentration of HCN will be (.381-x) and H+ and CN- will be x
put that into the formula for Ka, so it'll be Ka = x^2/(.381-x) and then use quadratic equation to solve. You'll end up getting x = 1.5 * 10^-5.
Then to find percent ionization you solve (concentration of formed ions / initial HCN)
Which will be (1.5 * 10^-5 / .381) * 100 = .00402 % making it a very weak acid <3
How many liters (L) of water need to be added to prepare 4800mL of 0.5M NaCl from a 3M NaCl stock solution? (Use the formula M1V1=M2V2)
Answer: There is 0.8 liters (L) of water required to be added to prepare 4800mL of 0.5M NaCl from a 3M NaCl stock solution.
Explanation:
Given: [tex]M_{1}[/tex] = 0.5 M
[tex]V_{1}[/tex] = 4800 mL
Convert mL into L as follows.
[tex]1 mL = 0.001 L\\4800 mL = 4800 mL \times \frac{0.001 L}{1 mL}\\= 4.8 L[/tex]
[tex]M_{2}[/tex] = 3 M
Formula used to calculate the volume of water required as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.5 M \times 4.8 L = 3 M \times V_{2}\\V_{2} = \frac{0.5 M \times 4.8 L}{3 M}\\= 0.8 L[/tex]
Thus, we can conclude that 0.8 liters (L) of water need to be added to prepare 4800mL of 0.5M NaCl from a 3M NaCl stock solution.
kaillie was talking and was distracted as she stirred sugar into her tea. when she finally noticed, there was a few crystals of sugar in the bottom of her cup that would not dissolve. what type of tea solution did kaillie?
a. unsaturated
b. saturated
c. supersaturated
d. cannot be determined
Answer:
Supersaturated
Explanation:
The tea has absorbed and dissolved as much sugar as it could. If there is sugar left at the bottom, it means the solution is supersaturated because it can't absorb any more.
BRAINLIEST NO LINK OR REPORTED A beach ball has a volume of 2.5 L of gas while at a temperature of 500 K. If the volume decreases to 2 L, what is the new temperature?
a. .25 K
b. 250 K
c. 400 K
d. 4k
Answer:
250k
I Really This Helps A Little Bit.
What is the conjugate base of the following acids?
a) HClO4 b) NH4 + c) H2O
d) HCO3 –
3. What is the conjugate acid of the following bases?
a) CN- b) SO4 2- c) H2O
d) HSO4-
Answer:
A
Explanation:
HOPE THIS HELPS
The volume of a gas at 4.50 atm is 1.90 L, if the pressure of the gas is increased to 6.70 atm, what is the new
volume? In this problem, V2 =
tje new preasure is 10.7l
Sodium oxide reacts with water to make sodium hydroxide.
1. Write and balance the equation.
2. List all the mole ratios.
3. How many moles of water are needed to react with 18.4 moles of sodium oxide?
4. How many grams of sodium hydroxide are formed when 4.5 moles of sodium oxide react with excess water?
5. How many grams of water are needed to make 5.65 moles of sodium hydroxide?
6. How many grams of sodium hydroxide are formed when 23.7 g of sodium oxide react with excess water?
7. How many liters of water are required to form 93.4 g of sodium hydroxide?
Answer:
So the total mass is 50 plus 150 grams the heat capacity 4.18 joules per gram per degree C. And the temperature change is 36 minus 25 and so we can calculate Delta H for the reaction that takes place.
Explanation:
Traits are passed from parents to offspring. These traits are determined by
Answer: Gene Characteristic. (They are usually made up of more than one gene).
100 pointts pls answer quick and no link :In the reaction, Hydrogen + Iodine --> Hydrogen Iodide at equilibrium, some Iodine is is added. What happens to the equilibrium?
Answer:
the concentration of hydrogen iodide will be higher than it was in the original equilibrium conditions.
Which type of energy resource uses heat from underground to create
electricity?
A. Solar energy
B. Biomass
C. Geothermal energy
D. Nuclear energy
What is a precipitation
reaction?
Answer:
A precipitation reaction is one in which substances in solution are mixed and an insoluble product is made. The insoluble product is called a precipitate and can be seen as a solid forming in the reaction mixture.
Which group of coefficients balances the following chemical equation? 2KCIO3 → _KCI + _O2 a 1, 3 b 2,2 C 2,3 d 2.1 e 1, 1
Answer:
2KClO3 = 2KCl + 3O2
I hope it's helps you
On the luminosity chart, temperature increases as you read it to the right. True or False?
Answer:
Explanation:
True
(I found this meme on Pinterest)
So what if when we get reincarnated on our tomb stone should we really write R.I.P or B.R.B?
lol don't report me my I asked my TEACHER this and she is wondering the same thing so this does effect me academically.
If you have 0.50 L of 0.45 M sodium bromide. How many grams of sodium bromide are present?
Answer:
23.175g
Explanation:
0.45 mole of NaBr is in 1 liter
? moles of NaBr is in 0.50 liter
0.50 × 0.45 = 0.225 of NaBr
1 mole of NaBr = 23 + 80 = 103g
0.225 moles of NaBr = ?
0.225 × 103 = 23.175g
The Volume of a gas is measured to be 675.6 mL at 61.8 C. If the volume of the gas were changed to 410.9 mL, what would the final temperature be?
Answer:
203.63 K
Explanation:
Using Charles law equation,
V1/T1 = V2/T2
Where;
V1 = initial volume (mL)
V2 = final volume (mL)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information in this question,
V1 = 675.6 mL
V2 = 410.9 mL
T1 = 61.8°C = 61.8 + 273 = 334.8K
T2 = ?
Using V1/T1 = V2/T2
675.6/334.8 = 410.9/T2
Cross multiply
675.6 × T2 = 334.8 × 410.9
675.6T2 = 137569.32
T2 = 137569.32 ÷ 675.6
T2 = 203.63 K
identify the reaction of S8+F2-->SF8
The given reaction is a combination / synthesis reaction, since two reactants combine to form a single product
Describe your observations of how the waves are behaving in the photograph.
Answer:
The waves are behaving this way due to the simultaneous water drops landing in the water.
Explanation:
because ima smart baddie (≧▽≦)
Which feature causes a gap in the geologic record?
extrusion
fault
o intrusion
erosion
Answer:
Hi, there the answer is
A)extrusion
Explanation:
The feature that causes a gap in the geologic record is called extrusion.
What is extrusion in geologic record?Sometimes magma can force itself through a crack or fault in the rock at the Earth's surface. It pours out over the Earth's surface in a volcanic eruption. This process is called extrusion. The rocks that form from extruded magma are called extrusive igneous rocks.
Direct Extrusion, Indirect Extrusion, Hydrostatic Extrusion and Lateral or Vertical Extrusion are some types of extrusion.
Lava that hardens on the surface is called an extrusion. The rock layers below an extrusion are always older than the extrusion. Beneath the surface, magma may push into bodies of rock. There, the magma cools and hardens into a mass of igneous rock called an intrusion.
Therefore, The feature that causes a gap in the geologic record is called extrusion.
Learn more about extrusion, here:
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Trihydrogen monophosphide is a covalent molecule that can also act as an acid. What is the correct acid name for trihydrogen monophosphide ?
Answer:
H₃P phosphidic acid
Explanation:
The Trihydrogen monophosphide, as stated in the exercise, can act as an acid. This is pretty similar to the case of hydrogen chloride, which is a gas but it can also be an acid, in this case, chloridic acid.
In the case of trihydrogen phosphide, we can write it molecular formula which is:
H₃P
Now, this is a binary compound because its composed of only two elements, in this case, hydrogen and phosphide. To name binary acid, we need to name the non metal with the sufije idic, and then, the word acid.
Following this simple rule, the trihydrogen phosphide would be, as acid:
H₃P: phosphidic acid
Hope this helps
Bobby has a toy car that is sitting at rest on the floor. He decides to play with his toy car and pushes it with 3 newtons to the right. Bobby's friend Sam also decides to play with the toy car and pushes it with 6 newtons to the left at the exact same time. Which of the following best describes the resulting motion of the toy car? A It travels to the right at an increasing speed. B It travels to the right at a constant speed. C It travels to the left at an increasing speed. D It travels to the left at a constant speed.
Answer: D
Explanation:
The car will move to the left because Sam is implying a grater force (3 N < 6 N) but it is traveling at a constant speed because there is still a force being acted upon it. <3
The result of applying forces to a toy car is required.
Option D is correct.
Force applied by Bobby is 3 N to the right
Force applied by Sam is 6 N to the left
Right is taken as positive and left is taken as negative.
m = Mass of toy
a = Acceleration
Net force applied to the toy
[tex]F=3-6\\\Rightarrow F=-3\ \text{N}\\\Rightarrow ma=-3\\\Rightarrow a=\dfrac{-3}{m}[/tex]
So, the toy will move left with a constant acceleration.
Constant acceleration means its speed will be increasing.
So, option D is correct.
Learn more:
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