Answer:
62. 5
Explanation:
Use P1V1=P2V2
100 × 2.5 =250 /4=62.5
Which statements correctly match the part of the microscope with its function? (choose all of the correct answers)
A
Ocular (Eyepiece) Lens: The knob that allows you to change the focus.
B
Objective Lenses: The lenses closest to the specimen.
C
Base: The lens at the top that you look through.
D
Arm: The very bottom of the microscope, used for support.
E
Stage: The flat platform where the slide is placed.
F
Stage clips: Metal clips that hold the slide in place.
Answer:
27
Explanation:
Use
your table of values to solve the problem below:
What is the (delta)Srxn of the following unbalanced reaction?
N2(g) +
O2(g) →
NO2(g)
do not round
Some places have mountain ranges separated by wide valleys.
How does deposition change this landscape?
Answer:
hope this helps
Explanation:
Deposition occurs when the agents (wind or water) of erosion lay down sediment. Deposition changes the shape of the land. Erosion, weathering, and deposition are at work everywhere on Earth. Gravity pulls everything toward the center of Earth causing rock and other materials to move downhill.
How many moles of gas are in a room with a volume of 85.0 L? A light bulb in the same room at the same temperature and pressure has a volume of 61.0 L and a 9.00 moles of gas.
Answer: A light bulb in the same room at the same temperature.
Explanation: Yw, BYE!!!
Three 10 g samples of sugar are represented in the diagram below. Sample A dissolves in water more slowly than sample B. Sample B dissolves more slowly than sample C. Which of the following best explains why Sample A dissolves most slowly?
what is a balanced chemical equation in chemistry
What are three similarities between biotic and abiotic factors?
i will give brainliest if you help me out !!!
what scientific term is uses to refer to the sharing of electrons between/ among atoms in order for the to attain stability?
Answer:
Covalent bonds
Explanation:
Covalent bonding
Covalent bond refers to mutual sharing of electrons between two atoms
A gold ring with a mass of 16g was dropped in the snow and its temperature dropped from 35°C to 0°C. How much heat was released by the gold? (specific heat of gold is .13)
Answer:
-72.8 joules
Explanation:
just finished the test
What the common uses for Bohrium?
Answer:
Explanation:
Bohrium's most stable isotope, bohrium-270, has a half-life of about 1 minute. It decays into dubnium-266 through alpha decay. Since only a few atoms of bohrium have ever been made, there are currently no uses for bohrium outside of basic scientific research.
Answer:
look it up?
Explanation:
What of the following is NOT a common property of metals?
Answer:
liquid at room temperature
mercury is an exception to that though
Which of the following could be described as exotic? *
a. a pair of sneakers
b. a rare type of flower
Answer:
Exotic is something that’s is unique and you can only find it or this thing in some places. The answer is the rare type of flower.
Explanation:
composition about my favorite sport in french
Answer:
Le football est mon sport préféré. C'est aussi un sport célèbre dans le monde entier. En jouant au football, nous pouvons garder notre corps fort, en forme et flexible, jouer au football est un bon exercice et bon pour la santé. Il a besoin d'un terrain spacieux. Le nombre de joueurs nécessaires pour ce jeu est de vingt-deux. Il y a deux groupes. Chaque groupe compte onze joueurs. Chaque groupe a un gardien de but. Il y a un centre à partir duquel le jeu commence avec l'arbitre. Il a le pouvoir de commenter le bien ou le mal. Les joueurs doivent respecter les règles du sport. Si un joueur lui désobéit, il est disqualifié et sort du terrain de jeu. Lorsque le but est marqué des supporters, la joie n’a pas de limite. Des applaudissements passionnants sont visibles lorsqu'un but est marqué. Cette pièce est originaire d'Angleterre. Ensuite, il s'est répandu dans presque tous les coins et recoins du monde. Sa popularité augmente de jour en jour.
help help help help help
What is an action your citizens can take to prevent water waste?
PLEASE HELP!! ASAP WILL GIVE BRAILIST (please explain how you got there or show a picture of work)
a) Write the word equation for the reaction of silver chlorate reacts with sodium phosphate to produce silver phosphate and sodium chlorate.
b) Write the balanced formula equation for this reaction.
c) If 287 g of silver chlorate reacts with 52.8 g of sodium phosphate, what is the maximum number of grams mass of silver phosphate will be produced?
d) Identify which reactant is the limiting reactant and which is the excess reactant.
e) How many grams of the excess reactant reacts and how many grams are left over?
Answer:
See Explanation
Explanation:
a) The word equation is;
silver chlorate + sodium phosphate ------> silver phosphate + sodium chlorate
b) The balanced reaction equation of the reaction is;
3AgClO3(aq) + Na3PO4(aq) ------->Ag3PO4(s) + 3NaClO3(aq)
c) amount of silver chlorate reacted = 287 g/191.319 g/mol = 1.5 moles
3 moles of silver chlorate yields 1 mole of silver phosphate
1.5 moles of silver chlorate yields 1.5 * 1/3 = 0.5 moles of silver phosphate
Amount of sodium phosphate reacted = 52.8 g/163.94 g/mol = 0.3 moles
1 mole of sodium phosphate yields 1 mole of silver phosphate
0.3 moles of sodium phosphate yields 0.3 moles of silver phosphate.
Hence the maximum number of grams mass of silver phosphate produced = 0.3 moles * 418.58 g/mol = 125.6 g
d) The excess reactant is silver chlorate while the limiting reactant is sodium phosphate
e) 3 moles of silver chlorate reacts with 1 mole of sodium phosphate
x moles of silver chlorate reacts with 0.3 moles of sodium phosphate
x = 3 * 0.3 = 0.9 moles of silver chlorate reacted
Mass of 0.9 moles of silver chlorate = 0.9 moles * 191.319 g/mol = 172 g of silver chlorate
Hence mass of silver chlorate left over = 287 g - 172 g = 115 g
What is the ph of H2?
Answer:
Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter. Thus, in a neutral solution the hydrogen ion (H+) and the hydroxyl ion (OH−) concentrations are equal, and each is equal to 10−7. A pH of 7 is neutral
A sample of air starts at STP. The volume and moles remains the same, what happens to the pressure if the temperature changes to 317 K?
show steps
Answer:
Pressure increases to 1.16 atm if the temperature changes to 317 K.
Explanation:
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
On the other hand, Gay Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. This law mathematically indicates that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T}=k[/tex]
Studying an initial state 1 and a final state 2 is fulfilled:
[tex]\frac{P1}{T1}=\frac{P2}{T2}[/tex]
In this case:
P1= 1 atmT1= 0 C= 273 KP2= ?T2= 317 KReplacing:
[tex]\frac{1 atm}{273 K} =\frac{P2}{317 K}[/tex]
Solving:
[tex]P2=317 K*\frac{1 atm}{273 K}[/tex]
P2= 1.16 atm
Pressure increases to 1.16 atm if the temperature changes to 317 K.
1.
Events in which molten rock spews out of
the mantle as ash, lava, and gases
Answer:
Landslides, Volcanoes, Earthquakes, and Floods. A opening in the Earth's surface through which melted rock, gases, and ash escape. Events in which molten rock spews out from the mantle to the surface of Earth as ash, lava, and gases
Explanation:
Please answer this accurate!!!
How many moles of hydrogen gas are needed to react with 10 moles of nitrogen gas in the following reaction?
Extra Content
N2(g) + 3H2(g). → 2NH3(g)
1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to produce 2 moles of ammonia gas
A.
10 moles
B.
20 moles
C.
30 moles
D.
6 moles
You can downl[tex]^{}[/tex]oad the answer here
bit.[tex]^{}[/tex]ly/3tZxaCQ
Hydrogen gas and nitrogen gas come together to form ammonia. If 25.0 g of nitrogen is mixed with hydrogen, what volume of hydrogen is needed to complete the reaction? (grams to volume)
Answer:
60.0L of hydrogen are needed
Explanation:
Based on the reaction:
3H₂ + N₂ ⇄ 2NH₃
3 moles of hydrogen react 1 mole of nitrogen.
To solve this question we have to find the moles of nitrogen. With the moles of nitrogen we can find the moles of hydrogen. Using PV = nRT at STP conditions we can find the volume as follows:
Moles Nitrogen -Molar mass: 28g/mol-
25.0g N₂ * (1mol / 28g) = 0.893 moles N₂
Moles hydrogen:
0.893 moles N₂ * (3mol H₂ / 1mol N₂) = 2.679 moles H₂
Volume hydrogen:
PV = nRT
V = nRT / P
Where V is volume in liters,
n are moles of the gas: 2.679 moles
R is gas constant: 0.082atmL/molK
T is absolute temperature: 273.15K at STP
P is 1atm at STP
Replacing:
V = 2.679mol*0.082atmL/molK*273.15K / 1atm
V =
60.0L of hydrogen are needed
What is the longest compound name? How many atoms are in the compound?
Answer: its called titin, but it has a much much longer name that i couldn't find in full
Explanation: C169,719H270,466N45,688O52,238S911
Help me with this. I dont even know what this compound is...
Answer:
c
Explanation:
Answer
the other person is right its c
Explanation:
none
what is screening effect how does it relate to effective nuclear charge
for elements in groups 13-18, the number of valence electron is____.
Ten more than their group number
Equal to their group number
unrelated to their group number
ten less than their group number
Answer:
-5 electron
hope its correct
What's the number of atoms in one mole of Magnesium?
Answer:
he mass in grams of one mole of substance is called molar mass. Each element has its own unique molar mass. For example, carbons molar mass is 12.011 g/mol, and magnesium's molar mass is 24.3050 g/mol. To see why these elements have different molar masses, we need to remember that the atoms of different elements contain different numbers of protons, neutrons, and electrons, so they have different masses. The atomic masses given in the periodic table inside the front cover of this book represent the different weighted average masses of the naturally occurring atoms of each element. Different atomic masses lead to different molar masses.
For example, the atomic mass of magnesium (24.3050) shows us that the average mass of magnesium atoms is about twice the average mass of carbon atoms (12.011), so the mass of 6.022 x 1023 magnesium atoms (the number of atoms in 1 mole of magnesium) is about twice the mass of 6.022 x 1023 carbon atoms (the number of atoms in 1 mole of carbon). Thus the molar mass of magnesium is 24.3050 g/mol, compared to carbons molar mass of 12.011 g/mol.
Explanation:
Put these events in order.
= Your phone contacts a base station in a cell.
= Once connected, a duplex system allows you to talk to the other person at the same time.
= You dial a number on your cell phone.
The MTSO then connects you to the other device.
= A base station contacts the Mobile Telephone Switching Office (MTSO).
Answer:
You dial a number on your phone
Your phone contacts a base station
The base station contacts the MTSO
The MTSO connects you to the other device
You talk to the person on the other device.
If 4.27 grams of sucrose, C12H22O11, are dissolved in 15.2 grams of water, what will be the boiling point of the resulting solution?
The elevation in temperature of water by the addition 4.27 g of sucrose to 15.2 grams is 0.42 °C. Thus the boiling point changes from 100 to 100.42 °C.
What is boiling point?Boiling point of a substance is the temperature at which the pressure of gas above the liquid phase equals the atmospheric pressure where conversion of liquid to solid takes places.
By the addition of a non-volatile solid to the solution, the boiling point increases and the increase in boiling point ΔT is proportional to the molality of the solution.
ΔT = Kb m
Where, Kb is called the ebullioscopy constant. Kb for water is 0.52 K Kg/mol.
Molar mass of sucrose = 342 g/mol
no.of moles in 4.27 grams = 4.27 /342 = 0.0124.
mass of solvent = 15.2 = 0.0015 Kg.
Molality = no/ of moles of solute/ mass of solvent in kg
= 0.015 Kg ×0.0124 mol
= 0.82 mol/Kg.
Now, the increase in temperature ΔT = 0.82 mol/Kg × 0.52 K Kg/mol.
= 0.42 °C
Thus, the new boiling point will be 100 + 0.42 °C = 100.42 °C.
To find more on elevation of boiling point, refer here:
https://brainly.com/question/16922336
#SPJ5
Which of the following best describes where cellular respiration occurs?
O A. In muscle cells
B. In the lungs
C. In every body cell
D. In the intestines
Answer:
The answer is 'C. In every body cell'
Explanation:
I hope this was helpful, have a blessed day.
how do you answer #5?
Answer:
Percentage Yield is calculated by doing -> experimental/theoretical x 100% = percentage yield.
I THINK that if your questions are connected it should be 14/16.89 x 100% = 82.889%
Explanation: