Answer:
A) 2
B) 1
C) 3
D) 4
i hope its right
Distillation is the process of seperating liquids by using ____.
A: a catalyst
B: a centrifuge
C: precipitation and transpiration
D: evaporation and condesation
Please answer this quickily (who ever answers this correctly and answers it first gets brainliest)
Answer:
a
Explanation:
i think
In a solution, the substance that has been dissolved is called the...
Answer:
solute
Explanation:
The substance being dissolved is called a solute. The thing the solute is being dissolved in is called a solvent.
What happens when an electrically charged pencil is placed close to the water running from a faucet?
the pencil attracts the water
the pencil becomes positively charged
the water attracts the pencil
the water repels the pencil
Answer:
the water repels the pencil
Explanation:
Since the an electrically charged pencil is placed close to the water running from a faucet :D
Answer:
Option 2
Explanation:
:)
How many moles are in a sample of toxic chlorine gas if it occupies a volume of 18 liters, at a temperature of 78 Celsius and a pressure of 11.5 atm?
What are the main properties of any liquid? Explain how you can measure the volume of a liquid sample.
Answer:
Liquid has the following properties -
- Liquids are almost incompressible due to the fact that molecules do not have a lot of space between them so they can not be compressed.
- Liquids have a fixed volume but shape varies according to the container it is placed in. It changes the shape even the volume is the same.
- Liquids flow from higher to lower levels.
- Liquids have their boiling points above room temperature, under normal conditions.
Measure the volume of a liquid sample-
The volume of the liquid can find out by dividing the mass of the liquid by the density of the liquid. D = m/v. The density of water is 1 gram/cubic centimeter.
Scientists collect and analyze proxy data in order to study _______.
A current weather conditions
B sea level rises
C past climate conditions and attempt to understand what caused past climate changes
D the emissions of greenhouse gases from human activities
Answer:
C
Explanation:
they use it to reconstruct past climate conditions
Consider the following reaction:
2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g)
At STP, what is the total volume of CO2 formed when 6.0 liters of C2H6 are combusted?
4 L
24 L
12 L
6 L
Answer:
4L
Explanation:
The first thing to do here is make sure that you have a balanced chemical equation. The equation given to you is actually unbalanced, so focus on writing a balanced version
2
C
2
H
6(g]
+
7
O
2(g]
→
4
CO
2(g]
+
6
H
2
O
(g]
Now, the problem provides you with a mass of ethane,
C
2
H
6
, and asks for the volume of carbon dioxide,
CO
2
, formed by the reaction at STP, Standard Temperature and Pressure.
As you know, STP conditions are defined as a temperature of
0
∘
C
and a pressure of
100 kPa
. Under these specific conditions, one mole of any ideal gas occupies exactly
22.7 L
- this is known as the molar volume of a gas at STP.
So, what this means is that if you know how many moles of carbon dioxide are produced by the reaction, you can use the molar volume of the gas to find the requested volume.
Use the molar mass of ethane to determine how many moles you'd get in that
240.0-g
sample
240.0
g
⋅
1 mole C
2
H
6
30.07
g
=
7.9814 moles C
2
H
6
Now, notice that you have a
2
:
4
mole ratio between ethane and carbon dioxide. Since ethane reacts with excess oxygen, you can assume that all the moles will take part in the reaction.
This means that the reaction will produce
7.9814
moles C
2
H
6
⋅
4
moles CO
2
2
moles C
2
H
6
=
15.9628 moles CO
2
So, if one mole of any ideal gas occupies
22.7 L
at STP, this many moles will occupy
15.9628
moles CO
2
⋅
22.7 L
1
mole CO
2
=
362.4 L
The answer is rounded to four sig figs, the number of sig figs you have for the mass of ethane.
Among animals, what is one major advantage of sexual reproduction compared to asexual reproduction?
List two functions organ systems can perform
Answer:
nervous system- sends signals to the brain
respiratory system- sends oxygen to the body
How many moles are in 26.8 L of NaCl?
Answer:
1.2 mol
Explanation:
26.8L x 1mol/22.4L = 1.2 mol
How many moles are in 25 grams of nitrogen trihydride?
Explanation:
molecules NH3 = 1.47 moles x 6.02x1023 molecules/mole = 8.9x1023 molecules of NH3 (to 2 sig. figs.)
Which of the following is a way to decrease rate of dissolution of a solid in a liquid?
a. decrease agitation
b. increase temperature
c. increase surface area
a. decrease agitation
both b. and c. will actually increase the rate, as more surface area means more space to dissolute, and higher temperature will agitate the molecules.
What is the meaning of democracy
Answer:
a system of government by the whole population or all the eligible members of a state, typically through elected representatives. its like everyone has a choiceExplanation:
Answer:
Demorcay is:The form of government of the entire population or of all qualifying members of the state, generally by elected representatives:
Explanation:
Hi! I'm doing homework about covalent bonds in Chemistry and I am supposed to figure out which 3 are right and which 3 are wrong. I'm having a really hard time. Any help is appreciated!
Answer:1,5,4
Explanation:
Write the chemical equation for the reaction in which silver carbonate is formed
Explanation:
Na2CO3+2AgNO3------>Ag2CO3+2NaNO3
Plssss help————>An object thats (A. Negatively, B. Neutrally, C. Positively) charged has more electrons than protons. An object that’s (A. Negatively, B. Neutrally, C. Positively) charged has fewer electrons than protons. An object that’s (A. Negatively, B. Not, C. Positively) charged has the same number of electrons and protons.
Answer:
1) negatively
2) positively
3) Neutral
Explanation:
Which statement accurately compares plant and animal cells?
A. A plant cell has a nucleus, but an animal cell does not.
B. A plant cell has a cell membrane and a cell wall.
C. An animal cell has a cell membrane and a cell wall.
D. An animal cell has mitochondria, but a plant cell does not
Answer:
B
Explanation:
A plant cell has a cell membrane and a cell wall
is a group of deer in a field called a community or a population?
Answer:
hi
Explanation:
Answer:
From the 2, I believe it is called a community.
What is in with those numbers? H2O?
Answer:
hydrogen atom and oxygen atom
3
Li
6.941
Atomic # =
Atomic Mass =
# of Protons =
# of Neutrons =
# of Electrons =
Answer:
36.94133.23Explanation:
pls mark brainliest
Based on the information in the tables, which salt will produce the greatest change in temperature when dissolved in water at 20 c
Answer:
See Explanation Note ...
Explanation:
Depending on amount added, Anhydrous CaCl₂ when dissolved in water solvent can become hot enough to blister ones skin when touched. On the cold side, Ammonium Nitrate will cool an aqueous solution enough to generate condensate frost on the outside of a glass beaker. I'm sure there are more examples but these two came to mind.
Answer:
KOH
Explanation:
I took the test
HELP ASAP
What was the result of the atomic theory?
A. Alchemy was transformed into a true science.
B. The atom was discovered.
C. Scientists realized there were four main elements.
D. Chemists began to better understand the properties of matter.
The result of the atomic theory was that chemists began to better understand the properties of matter. Therefore, option (D) is correct.
The atomic theory, proposed by John Dalton in the early 19th century, postulated that matter is composed of indivisible particles called atoms. This theory revolutionized the field of chemistry by providing a framework to understand the behavior and interactions of different substances.
By recognizing that matter is composed of discrete atoms with specific properties, chemists were able to explain phenomena such as chemical reactions, the conservation of mass, and the formation of compounds. The atomic theory laid the foundation for modern chemistry, leading to advancements in understanding the structure of atoms, the development of the periodic table, and the ability to manipulate and engineer materials at the atomic level.
Learn more about atomic theory, here:
https://brainly.com/question/28853813
#SPJ2
are absolute temperature and kelvin temperature scale the same thing
Answer:
No they are not the same..
Explanation:
Absolute temperature is the temperature of an object on a scale where 0 is in the lowest possible energy state while the kelvin is a base unit of temperature.
On the window sill is a potted plant. The plant always seems to lean toward the window. Even though you turn its pot around every morning, by evening you find that it has turned away from the center of the room and towards the window again. Why does this happen?
Answer:
because im trynna get these 5 points
Explanation:
mklnk.m
Un niño de 9 años se encuentra balanceándose en un columpio, si el columpio se encuentra en equilibrio y la cadena que soporta la canastilla donde se sienta el niño tiene un peso de 15Kg y este se encuentra a 42°con respecto a la perpendicular. Determine la tensión de la cadena y la fuerza con la que es empujado si el niño pesa 35Kg.
Answer:
Part A
La tensión en la cadena es de aproximadamente 364,14 Newtons
Part B
La fuerza con la que se empuja el columpio es de aproximadamente 327,874 Newtons
Explanation:
Parte A
Los parámetros dados son;
La masa del asiento en el que se sienta el niño = 15 kg
La inclinación de la cadena de la vertical, θ = 42 °
La masa del niño = 35 kg
La aceleración debida a la gravedad, g = 9,8 m / s²
La tensión en la cuerda, 'T', se da de la siguiente manera;
T = m · g · cos (θ)
Dónde;
m = m₁ + m₂ = 15 kg + 35 kg = 50 kg
g = La aceleración debida a la gravedad = 9,8 m / s²
θ = 42 °
Por lo tanto;
T = 50 kg × 9,8 m / s² × cos (42 °) ≈ 364,14 N
La tensión en la cadena, T ≈ 364.14 N
Parte B
La fuerza con la que se empuja el columpio, 'F', se da de la siguiente manera;
F = m · g · sin (θ)
Por lo tanto;
F ≈ 50 kg × 9,8 m / s² × sen (42 °) ≈ 327,874 N
La fuerza con la que se empuja el columpio, F ≈ 327,874 N.
Which of the following is an electrolyte?
a. PbCl2
b. MgS
c. HNO3
d. Al2(Cr2O7)3
Answer: A: PbCl2
Hope dis helps!
Combustion analysis of a hydrocarbon produced
0.40g of CO2 and 0.205g of H20. Calculate the
empirical formula of the hydrocarbon.
how are enthalpy and entropy related to chemical reactions? (in simple terms)
Answer: Enthalpy is the heat content of a system. The enthalpy change of a reaction is equivalent to the amount of energy lost or gained during the reaction. A reaction is favoured if the enthalpy of the system decreases over the reaction. Entropy refers to the measure of the level of disorder in a thermodynamic system.
Explanation: hi lol
HELP! A 25-mL solution of 2.0 M hydrobromic acid is kept in a bottle. How many moles of the acid is in the solution?
Answer: hello mason
Explanation: figure it out yourself
Why a hot cup if water has more thermal energy than a cold cup of water?
Answer:
The hotter the substance, the more its molecules vibrate, and therefore the higher thermal energy
:)
Answer: Hot water has more thermal energy because the particles are farther apart thus they are moving faster. As particles move faster their thermal energy increases.
Explanation: Look in answer