Answer:
There are 0.5 mole in 20g of argon.
Explanation:
40 g of argon = 1mole
Then 20g of argon is,
→ 1/40 × 20
→ 0.5 mole
Answer:
[tex]n = \frac{mass}{molar \: mass} \\ n = \frac{20g}{39.948 \frac{g}{mol} } \\ n = 0.5 \: mol \: of \: argon[/tex]
Explanation:
hope this makes sense
:)
If 9.9L of helium are in a tire at 303k,how many liters will be present at 403k if the pressure is held constant.
Answer:
Final volume, V2 = 13.18 Liters
Explanation:
Given the following data;
Initial volume = 9.9 L
Initial temperature = 303 K
Final temperature = 403 K
To find the final volume, we would use Charles law;
Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Charles' law is given by the formula;
[tex] VT = K[/tex]
[tex] \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Where;
V1 and V2 represents the initial and final volumes respectively.T1 and T2 represents the initial and final temperatures respectively.[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]
Making V2 as the subject formula, we have;
[tex] V_{2}= \frac{V1}{T1} * T_{2}[/tex]
[tex] V_{2}= \frac{9.9}{303} * 403 [/tex]
[tex] V_{2}= 0.0327 * 403 [/tex]
Final volume, V2 = 13.18 Liters
What value is closest to the mass of the atom ?
Answer:
mass number
Explanation:
Answer and Explanation: The value closest to the mass of an atom is its mass number. The mass number is the total count of the protons and neutrons in the nucleus of the...
mass number
hope that helped
What does every weak base have?
has a Acids Bases
HCl LiOH
HBr NaOH
HI KOH
HNO 3
A certain atom has a mass of 16 and an atomic number of 7. What element is this ?
Answer:
Nitrogen
Explanation:
According to the Periodic Table, the atom with a mass is 16 but the Atomic number is 7 for Nitrogen. That means that Nitrogen is an isotope.
The table below gives some characteristics of element Y.
Characteristics of element Y Values
Mass number 11
Number of neutrons in a single atom 6
Average atomic mass (grams/mole) 10.81
What is the identity of element Y?
Answer:
Boron B
Explanation:
According to the periodic table, Boron is the element with atomic mass of approximately 11 [i.e 10.81]
To calculate Neutrons
Neutrons = Mass number - Protons
Number of protons in Boron is same as atomic number which is 5
Thus, N = 11 - 5 = 6
How do protons and neutrons stay together in a nucleus?
A Electrostatic forces hold them together
B. Gravitational forces hold them together
C Weak nuclear forces hold them together
D. Strong nuclear forces hold them together
Answer:
strong nuclear forces that hold them together
What are 3 things that
happen to your body when you start exercising
regularly?
Explanation:
Weight loss and weight maintenance.
Muscle gain.
Improved mood.
Improved heart health.
Most terrestrial plants are members of this Division:
Bryophyta
Angiosperms
Pinophyta
Pteridophyta
Answer:
most flowering plants are classified as angiosperms
Answer:
I think the answer is Bryophyta
Explanation:
seedless,non vascular plants that are the closest extant relative of early terrestrial plants
A child sits on a partially filled balloon and decreases the volume by half. What happens to the pressure inside of the balloon?
It increases
It decreases
It stays the same
**Check for proof photos at the bottom.**
**Answers are in bold.**
__________________________________________________________
A child sits on a partially filled balloon and decreases the volume by half. What happens to the pressure inside of the balloon?
A. It increases
For the same balloon, how does the density inside the balloon change?
A. increases
A scientist takes a small, partially inflated balloon out of liquid nitrogen (at a very low temperature). As the balloon rests on the table, it begins to grow in size. Which statement(s) best explains why the balloon grows?
B. The air warms and increases particle movement. Increased particle movement leads to increased volume.
C. Increased temperature means increased volume as long as the container is flexible.
__________________________________________________________
Answer the following questions with or without using a calculator.
A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?
✔ 11.2 L
A syringe contains 0.10 mol neon gas at STP. What volume does the syringe indicate?
✔ 2.24 L
A chemist adds 0.10 mol argon gas to the syringe. The pressure and temperature remain constant. What will be the volume on the syringe after the argon is added?
✔ 4.48 L
__________________________________________________________
Acetylene gas (C2H2) reacts with oxygen gas (O2) to produce carbon dioxide (CO2) and water vapor (H2O). How many liters of C2H2 are required to produce 75.0 L of CO2?
37.5 L
What volume of H2O is produced?
37.5 L
What volume of O2 is required?
93.8 L
When making the calculations, did you need to find the number of moles?
✔ no
Liquid carbon disulfide (CS2) reacts with 44.8 L O2 gas to produce the gases carbon dioxide (CO2) and sulfur dioxide (SO2).
What is the mass of carbon dioxide produced?
29.3 g
What is the mass of sulfur dioxide produced?
85.4 g
When making the calculations, did you need to find the number of moles?
✔ yes
__________________________________________________________
Explanation:The child is putting pressure on the balloon, and squishing particles together when he/she sits on it, thus increasing pressure. Since particles are being squished closer together, density also increases.
Inflated objects will grow in size when the air inside is hotter. This is because particles move more rapidly. An example would be bike tires being more inflated under hot conditions.
One mole of any gas at standard temperature and pressure (STP) will occupy 22.4 L. If pressure increases, the volume decreases, and vice versa. If moles decreases, so will the volume, and vice versa.
Here are photos of Edge just incase.
The pressure inside of the balloon will Increase. Hence The correct option is (A).
What is Boyle's Law ?
According to this law, the pressure (p) of a given quantity of gas varies inversely with its volume (v) at constant temperature; i.e., in equation form,
pv = k
Where K = constant.
Initial pressure = P₁Initial volume = V₁Final pressure =P₂Final volume = V₂If we consider that temperature of the gas which filled inside the balloon is constant.
We know that , at constant temperature
P₁V₁ = P₂V₂
Given that
V₂ = V₁ / 2
P₂ = P₁V₁/V₂
P₂ = P₁V₁/V₁/2
P₂ = 2P₁
Therefore, the pressure inside the balloon will become double.Hence The correct option is (A).
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What makes up a compound
Answer:
Elements make up a compound.
I have an atomic number of 56 who am i?
Answer:
You are Barium
Explanation:
Have a great summer :)
Answer:
Barium
hope this helps
have a good day :)
Explanation:
Vierte dos líquidos en una pendiente. No sabes qué tipo de sustancias son y necesitas saber cuál es más viscosa. La única herramienta que tienes es un cronómetro. ¿Qué puedes hacer para solucionar este problema?
Answer:
La respuesta está en la explicación
Explanation:
La viscosidad se puede definir como la resistencia al movimiento que presenta un líquido.
Al verter dos líquidos por separado en una pendiente, podrás ver cómo un líquido se tardará más en llegar al final de la pendiente que el otro. Este líquido será EL MÁS VISCOSO.
Así podrás, con el cronómetro, medir el tiempo que cada líquido se tarda en llegar a cierto punto de la pendiente, EL QUE TARDE MÁS SERÁ EL MÁS VISCOSO.
why is baking powder a substance
Answer:
Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid. Because carbon dioxide is released at a faster rate through the acid-base reaction than through fermentation.
Baking powder is a mixture because it contains both sodium hydrogen phosphate and potassium hydrogen tartrate (two different compounds.)
There are many factors that influence the population changes of an ecosystem. Which of these does not influence population size in an ecosystem? A. Birthrates of animals B. An animal's weight C.Number of animals in habitats D.Number of animals in habitats
Answer:
B. An animal's weight
Explanation:
An animal's weight is the factor that does not influence population size in an ecosystem because this factor does not cause an increase or decrease the population of animals in an ecosystem. The birth and death rate of animals and number of animals in habitats are the factors that tells us about the increase and decrease in the population of organisms in an ecosystem but weight of organism can't affect the population.
Answer:
B. An animal's weight
Explanation:
Population growth is based on four fundamental factors: birth rate, death rate, immigration, and emigration.
What is the physical state of nitrogen at -200c
Which gas is produced when a carbonate undergoes thermal decomposition
Answer:
carbon dioxide gas
Explanation: This type of reaction is called a thermal decomposition. This reaction is very common in where carbon dioxide gas makes Products rise..
The chemical reaction
2 H2 +O2 → 2 H20 is a:
a. synthesis reaction
b. decomposition reaction
c. single displacement reaction
d. double displacement reaction
e. combustion reaction
Answer:
double displacement reaction
Calculate the mols for 4.2g of a Mg
Answer:
0.175mol
Explanation:
Mole of a substance can be calculated using the formula as follows:
number of moles (n) = mass (m) ÷ molar mass (MM)
According to this question, there are 4.2g of Magnesium (Mg).
Molar mass of Magnesium = 24g/mol, hence, the number of moles of 4.2g of Mg is as follows:
n = 4.2g ÷ 24g/mol
n = 0.175mol
what is an earthquake's epicenter found
Answer:
an epicenter is where an earthquake first hit
Answer:
The epicenter
Explanation:
The location below the earth's surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter. ... These are smaller earthquakes that occur afterwards in the same place as the mainshock.
Write the nuclear equation for the beta decay
of calcium-45.
Answer:
on https://www.ck12.org/book/peoples-physics-concepts/section/20.1/
Explanation:
it shows for calcium 45 and maybe a possible equation on 3/4th's scroll down?
Will these magnets attract or repel?
Attract
Repel
Answer:
repel, if you stick them together as they are, because the north and south poles are next to each other
Explanation:
Give me formula for
1)Aluminium chloride
2) Copper sulphate
3) Zinc Nitrate
3) Ammonium Carbonate
Answer:
1. AlCl₃
2. CuSO4
3. Zn(NO₃)₂
4. (NH4)2CO3
2. Measure the length of a page in centimeters to the nearest tenth of a centimeter with the metric edge of a ruler. Note that nine lines divide the space between each centimeter into 10 millimeters.
The page is ____27.5____ cm long
58
Explanation:
ccause that is how long it is
Heterogéneo de tres fases y un componente.
HELP ASSAP!!
The molecule shown is an example of a
A)
methyl ester.
B)
wax.
C)
triglyceride.
D)
sodium carboxylate.
Answer: b
Explanation:
The molecule is WAX.
What is WAX?Waxes consist of long-chain fatty acid attached through ester oxygen to long-chain alcohol. These molecules exist completely water-insoluble and typically solid at biological temperatures.
The main objective of the waxes is to provide a water-proof layer to the feathers, but other processes have also been suggested. Some of these lipids can also recreate a role as pheromones in sexual signaling.
the characteristics of wax are-
1. Solid at room temperature; liquid at more increased temperatures.
2. Primarily hydrocarbon in design.
3. Water repellent; insoluble in water.
4. Smooth texture; buffable under slight pressure.
5. Low toxicity; low reactivity.
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the pH of orange juice is 4.0. what is the hydrogen ion concentration in orange juice ASAP PLEASE
pH = 4
- log[H+]= 4
[tex][H+] = {e}^{ - 4} [/tex]
[tex][H+] = 54.6[/tex]
The pH of orange juice 4. The concentration of hydrogen of [tex]10^{-4}[/tex].
What is pHThe pH scale, which originally stood for "potential of hydrogen," is being used to describe the acidity or alkalinity of aqueous solutions.
Calculation of concentration of hydrogen ion by using pH formula.
It can be calculated by using the formula.
pH = -log[[tex]H^{+}[/tex]].
[[tex]H^{+}[/tex]] = [tex]10^{-pH}[/tex]
[[tex]H^{+}[/tex]] = [tex]10^{-4}[/tex]
Therefore, the concentration of hydrogen ion by using pH formula will be [tex]10^{-4}[/tex].
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the ending of a compounds name that is made up of three elements,one of which is oxygen
Answer:
—COOH
Explanation:
—COOH, acid group, containing 3 elements, C, carbon, O, oxygen, and H, hydrogen.
What is the pH of a solution whose H + concentration is 4.0 10 –9?
Answer:
he pH of a solution is defined as the negative log10 [H+] ... 1 x 10-11. 11. Acidic Solution. 1 x 10-4. 4. 1 x 10-10. 10. 1 x 10-5. 5. 1 x 10-9.
Explanation:
m
1. What is the volume of 4.00g of aluminum at STP?
Answer:
22.4cm³
Explanation:
Avogadro's law shows that Avogadro's volume is 22.4
The atoms of elements A (blue) and B (orange) form 2 compounds shown here. Do these compounds obey the law of multiple proportions?
Hello. You have not presented the image that presents the two elements mentioned in the question. This makes it impossible for your question to be answered. However, I will try to help you as best I can.
To say whether the compounds obey the law of multiple proportions, you should observe whether one of the elements, formed from the compounds, maintains a fixed mass, while the other element presents the mass in a varied amount of small, whole numbers, spread across the formed compounds .
This is because the law of multiple proportions states that an element must have a fixed mass when reacting with another element to create compounds. This reaction will allow this element to keep the mass fixed, while the other element will generate different compounds, where each one presents a part of the mass of the forming element, in small and whole numbers.