Answers
Answer: b I think
Explanation:
Related Questions
if 3.75 moles of LiCl is added to 72.7 ml of water, what is the molarity?
Answers
Our solution will have a volume of 72.7 mL, or 0.0727 L, since the addition of soluble LiCl will not appreciably affect the volume of the solvent.
Our solute is the LiCl, of which we have 3.75 moles.
Thus, the molarity of our LiCl solution will be (3.75 moles LiCl)/(0.0727 L) = 51.5 M LiCl.
32)
In some water purification plants, solid matter is skimmed off the top of the water. This is separating a mixture by what method?
A)
chromatography
B)
evaporation
floatation
D)
sifting
Answers
Using your own words, explain energy.
Answers
1. You have 3.5L of a gas at 6 atm of pressure. The pressure drops to 2.4 atm, what is the new volume of
the gas?
I
Answers
Answer:
8.75 LExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we're finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{3.5 \times 6}{2.4} = \frac{21}{2.4} \\ = 8.75[/tex]
We have the final answer as
8.75 LHope this helps you
Which of the following CANNOT be used as a conductor?
Copper
Water
Paper
Gold
Answers
a. silicon
b. carbon
c. beryllium
d.chromium
Answers
Answer:
It's a. silicon
Explanation:
What are the controlled, independent, and dependent variables in a basic density column experiment?
WILL MAKE BRAINLIEST
Answers
Answer:
The Independent Variable is what we change or control in the experiment. The Dependent Variable is what we are testing and will be measured in the experiment. The Control Variables are what we keep the same during the experiment to make sure it's a fair test. hope this helps =)
Explanation:
N2(g) + 2 O2(g) → 2 NO2(g)
Answer
Answers
Answer:
180.6
Explanation:
N2 (g) + 2O2 (g) → 2NO2 (g) ΔH = 66.4 kJ
2NO (g) + O2 (g) → 2NO2 (g) ΔH = -114.2 kJ
Hope this helped, and please mark as Brainliest :)
The diagram below shows four coastline locations on Earth with respect to the moon at a given time. Moon A B D C In this current position, which coastline(s) are experiencing a daily high tide? Only A O Only B O Both A and C Both B and D
Answers
Answer: Only A
Explanation: The moon controls the tides because of its gravitational pull. The moon's gravitational pull is weaker than Earths that is why the moon's gravitational pull only effectts water on the earth.
Suppose you are designing a heat exchanger to remove energy from a motor as quickly as possible. Energy will be transferred from the motor to the heat exchanger. Then the energy will be transferred from the heat exchanger to the air. The table shows the thermal conductivities of a few substances as measured in W/m·K. The greater the thermal conductivity, the faster the rate of energy transfer. Which material would be the best choice?
a: copper
b: glass
c: steel
d: polystyrene
Answers
1. A substance containing two or
more elements bonded together.
Answers
Answer:
it's molecule
i have to solve it in 20 characters XD
Which are different structures of the eye? Select four options.
please help !!!!!!!!
pupil
cochlea
cornea
auricle
retina
lens
Answers
Answer:
Pupil, Cornea, Retina, and Lens
Explanation:
2. What evidence is there that mass extinction events occurred?
Answers
Answer: Although the best-known cause of a mass extinction is the asteroid impact that killed off the non-avian dinosaurs, in fact, volcanic activity seems to have wreaked much more havoc on Earth's biota. Volcanic activity is implicated in at least four mass extinctions, while an asteroid is a suspect in just one. Examples, of mass extinctions are Permian extinction of marine species, and Cretaceous extinction of various species, including dinosaurs.
solid sodium chloride is dissolved in water. the sodium chloride solution is electrolysed in the apparatus. state why sodium chloride solution , rather than solid chloride must be used in this experiment.
Answers
Answer: water solutions conducts charge
Explanation: solid sodium chloride is n insulator.NaCl is dissolved in water
In ionic forms. In solution there are Na+ and Cl- ions which can transfer charge.
What is simple chemical test could you carry out to see if carbon dioxide has been produced
Answers
Carbon Dioxide
A positive test will result in the lime water turning milky. Lime water turns milky as the Calcium hydroxide (chemical name for limewater) reacts with carbon dioxide to form Calcium Carbonate which is insoluble in water and thus forms a milky white precipitate.
Una solución hallar punto de vista física y punto de vista químico (sal) 50g de sal y 250 ml de agua hallar %m/m %m/v molalidad, molaridad, fracción molar del soluto y del solvente
Answers
Answer:
% m/m = 16.6%
% m/v = 20%
3.42 m (molalidad)
3.42 M (molaridad)
Fraccion molar del soluto = 0.06
Fraccion molar del solvente = 0.94
Explanation:
Nuestra solución está compuesta por:
Soluto: 50 g de sal
Solvente: 250 mL de agua.
%m/m %m/v molalidad, molaridad, fracción molar del soluto y del solvente son distintas formas de definir la concentración:
% m/m son los gramos de soluto cada 100 g de solución.
No sabemos la masa de solución pero con la densidad del agua (solvente), sabemos que los 250 mL contienen 250 gramos de solvente. (Densidad del agua 1g/mL). En conclusión, la masa de solución es 50 g + 250g = 300
% m/m = (50g /300g ) . 100 = 16.6%
Vamos a definir que el volumen de la solución es igual al del solvente: 250 mL.
% m/v = la masa de soluto, cada 100 mL de solución
= (50 /250) . 100 = 20 %
Molalidad, son los moles de soluto por cada kg de solvente.
Convertimos gramos a kg → 250 g . 1kg /1000g = 0.25kg
Convertimos la masa de soluto (sal) a moles.
NaCl → 50 g . 1mol/ 58.45g = 0.855 moles
m = 0.855 /0.25 → 3.42 m (molalidad)
Molaridad son los moles de soluto por cada L de solución.
Convertimos mL a L → 250 mL . 1kg / 1000mL = 0.25 L
sabiendo que los moles de soluto son 0.855, en este caso la molaridad es igual a la molalidad ( 3.42 M)
Para calcular la fracción molar, necesitamos moles de soluto y de solvente.
Ya contamos con los moles de soluto.
Moles de solvente: 250 g . 1mol /18g = 13.89 mol
Moles totales = 0.855 + 13.89 = 14.745
Fracion molar del soluto: (0.855/ 14.745) = 0.06
Fraccion molar del solvente: (13.89 / 14.745) = 0.94
Which statement describes proper conduct in the laboratory?
Select one:
O a. Eating snacks in the laboratory is allowed.
O b. In order to identify things they should be tasted.
O c. Colorless fumes should be identified by direct smelling.
O d. Be aware of the location of safety and first aid equipment.
Answers
Answer:
D.
Explanation:
I mean. It's logic for sure
Answer:
Its D and pls mark brainliest
Explanation:
Why do you think it is a bad idea to use taste, touch, or smell to identify an
unknown chemical?
Answers
Answer:
Because it can cause health problems or injuries to our sense organs.
Explanation:
Chemicals in the laboratory are made up of different constituents, which may be dangerous or injurious to health. This is the reason why safety measures or precautions have to be taken when working in the laboratory. One of those safety measures is that "one should never use taste, touch, or smell to identify an unknown chemical".
This is so because a chemical that is unknown amounts to the fact that what such chemical contains is unknown, hence, the chemical might have the ability to cause harm or injuries to the sense organ. For example, a conc. acid that is tasted will burn the tongue etc.
Compute the brightness difference appearing in an aperture of 2 inches and one of 100 inches (Plz Help, i need to get this done today)
Answers
Answer:
The 2 inches would be brighter than the one of 100 inches
Potassium
©State what would be observed if a lighted
match stick was held in the mouth
of the
beaker.
Answers
Answer:
We observe that hydrogen burns at mouth of beaker with blue flame and pop sound is heard. It is a chemical change.0 Which is not a chemical change?
A Iron combines with oxygen to form
rust.
B Wax melts as it absorbs heat from a
flame.
C Pure sodium explodes when dropped
in water.
D Glucose molecules are produced in a
plant leaf.
Answers
Answer:
B, wax melting
Explanation:
When wax melts, the form of matter is the only thing that changes. Wax in this case goes from a solid to a liquid, and this process can be reversed when it cools. Hence labeling it a physical change instead.
CH3OH can be synthesized by the reaction:
CO(g) + 2 H20) — CH3OH)
What volume of CH3OH gas (in L) can be synthesized if 18.6 L of Hy gas completely reacts at STP conditions?
Answers
Answer:
5
Explanation:
What does chlorination do?
Answers
Answer: Chlorination is the process of adding chlorine to drinking water to kill parasites, bacteria, and viruses. Different processes can be used to achieve safe levels of chlorine in drinking water.
Work=? time=5s Power = 40w
Answers
Answer:
200 J
Explanation:
Work = Power x time
Work = (40w)(5s)
Work = 200 J
____________ is refining the extracted raw metals into a purest form
Answers
Answer:
Extractive metallurgy
Explanation:
Extractive metallurgy is the practice of removing valuable metals from an ore and refining the extracted raw metals into a purer form.
HELP ASAP!!!
WAVES ALWAYS ORIGINATE WITH SOME
a
person
b
object
C
disturbance
Answers
Answer:
Disturbance
Explanation:
I believe it is Disturbance because waves are normally caused by wind, and wind classifies as Disturbance.
please answer thx will mark brainliest if correct
Answers
Answer:
C
Explanation:
Gases have lowest forces of attraction.
HURRY ILL GIVE BRAINLIEST!
Match the cause to its effect.
Answers
Answer:
Cattles are giving nutrition supply throughout the year----some animals require nutrient enhancement for health
calves are given colostrum at birth----newborns require antibodies from their mothers
I dont want to write, so you know what the last option is
Explanation:
:) hope this helps
The complete
conversion of 90.0
grams of hydrogen to
ammonia would require
how many moles of
nitrogen gas?
Answers
Answer:
15moles
Explanation:
The balanced equation of this reaction is as follows:
N2 + 3H2 → 2NH3
Molar mass of H2 = 2g/mol
mole = mass/molar mass
mole = 90/2
mole = 45moles.
Based on the above balanced equation, 1 mole of nitrogen gas (N2) reacts with 3 moles of hydrogen gas (H2)
Hence, 45moles of hydrogen gas will produce (45 × ⅓) = 15moles of nitrogen gas (N2).
Answer:
Its 14.9 for those who are doing the escape room :)
Explanation:
CH4O+ O2 → CO2 + H2O
Balance the following chemical equation
Answers
Answer:
2 CH4O + 3 O2 = 2 CO2 + 4 H2O