Answer:
The process in which a solid changes directly to a gas is called sublimation. It occurs when the particles of a solid absorb enough energy to completely overcome the force of attraction between them. Dry ice (solid carbon dioxide, CO2) is an example of a solid that undergoes sublimation.
Can someone please help me
Answer:
I would say w is the answer
Answer
The answer is W
1.
What part of the human body is the wing most like? ANSWER
Help
What part of the human body is most likely the wing would proabably from your elbow joint and the rest of your arm but most likely it would be the elbow joint.
Please answer question #4
Answer:
F=500×3 = 1500 N
W = 1500×10 =15000 Nm
3. Which of the following elements is more reactive than potassium, K?
a. Sodium, Na
b. Copper, Cu
C. Vanadium, V
d. Caesium, Cs
Answer:
d. Caesium
Explanation:
Actually Rubidium is more reactive than potassium but since it is not in the options given, Caesium is the next most reactive
If an effusion experiment, it required 45 seconds for
a certain number of moles of an anknown gas to pass through
a small orifice into a vacuum. Under the same conditions, It required 18 seconds for the same number of moles of oxygen to effuse. Find the molecular mass of the unknown gas.
Answer: A vacuum. Under the same conditions 16 s were required for the same number of moles of O2 to effuse. ... The molar mass of the unknown gas is 200 g/mol. calculation ... QUESTION 1 If gas-burning appliances are vented into an unlined masonry chimney, deteriorate and crumble and may · PLS HELP
Explanation:
Explain using specific
examples how the skeleton
provides the body with
physical protection and
protection against
infection. (6 marks)
Answer:
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Answer:
The vertebral column holds the body upright. Movement - muscles are attached to bones, which are jointed. When the muscles contract the bones move. Blood production - red blood cells (to carry oxygen) and white blood cells (to protect against infection) are produced in the bone marrow of some bones.
How many moles of platinum atoms are in 2.408 x 1023
answer:
The mass of 4×10²¹ atoms Pt is ≈ 1 g Pt.
explanation:
Which structures group together to form a system in the human body
Answer:
organs group together to form organ systems
Explanation:
how would you separate the components in a mixture of chlorine and hydrogen gas
What would happen to the entropy in the reaction 2O^3(9) ► 3O^2 (g)?
O A. It decreases.
O B. It increases
O c. It stays the same.
O D. It is impossible to tell.
What function does this cytoplasm perform in a plant and animal cells
Answer:
It helps shape, while holding and keeping organelles in their place.
Explanation:
Answer:
it holds the cell organelles
Explanation:
You are welcome
Which of the following gas samples would have the largest volume, if all samples are at the same temperature and pressure?
a 0.498 moles CO2
b 19.91 grams of Ar
c They would all have the same volume
Answer:
They would all have the same volume.
Explanation:
Let us consider the same temperature and pressure of both Ar and CO₂ is standard temperature and pressure.
Standard temperature = 273.15 K
Standard pressure = 1 atm
Number of moles of CO₂ = 0.498 mol
Volume of CO₂ = ?
Solution:
PV = nRT
R = general gas constant = 0.0821 atm.L /mol.K
1 atm × V = 0.498 mol × 0.0821 atm.L /mol.K × 273.15 K
1 atm × V = 11.17 atm.L
V = 11.17 atm.L/1 atm
V = 11.17 L
Volume calculation for Ar:
Number of moles of Ar:
Number of moles = mass/molar mass
Number of moles = 19.91 g /39.95 g/mol
Number of moles = 0.498 mol
Number of moles are same thus it will occupy same volume. We can prove it through calculation given below,
PV = nRT
R = general gas constant = 0.0821 atm.L /mol.K
1 atm × V = 0.498 mol × 0.0821 atm.L /mol.K × 273.15 K
1 atm × V = 11.17 atm.L
V = 11.17 atm.L/1 atm
V = 11.17 L
which atomic model has a positively charged nucleas and q negatively charged cloud of electrons giving the atom it's size?
Answer: In Thomson's model, the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged “plums” surrounded by positively charged “pudding”. The 1904 Thomson model was disproved by Hans Geiger's and Ernest Marsden's 1909 gold foil experiment.
Explanation:
This is a collage question It's a hard one.
Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6 m/s2?
A. 13 N
B. 7 N
C. 8 N
D. 12 N
F = 13 N
Further explanationGiven
Acceleration= a = 2.6 m/s²
Required
Force
Solution
Newton's second law :
ΣF = m x a
The wheeled cart used in the experiment is the same, so the mass used is the same
We use one of the data for example data 1 to find mass :
F = 1 N, a = 0.2 m/s²
m = F/a
m = 1/0.2
m = 5 kg
so for acceleration= a = 2.6 m/s² :
F = 5 kg x 2.6 m/s²
F = 13 N
Which of the following is true of SOLUBILITY?
A. if something is soluble, it will dissolve in anything
B. water will dissolve everything
C. substances often dissolve in some things and not others
How many molecules OF2 would have a mass of .132 g
1.47 × 10²¹ molecules OF₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional Analysis Explanation:Step 1: Define
0.132 g OF₂
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of O - 16.00 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of OF₂ - 16.00 + 2(19.00) = 54.00 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 0.132 \ g \ OF_2(\frac{1 \ mol \ OF_2}{54.00 \ g \ OF_2})(\frac{6.022 \cdot 10^{23} \ molecules \ OF_2}{1 \ mol \ OF_2})[/tex]Divide/Multiply: [tex]\displaystyle 1.47204 \cdot 10^{21} \ molecules \ OF_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.47204 × 10²¹ molecules OF₂ ≈ 1.47 × 10²¹ molecules OF₂
If one parent has sickle cell anemia and the other parent is a carrier, what is the possibility that their child will have sickle cell anemia
What increases pressure?
a
more particles and higher temperatures
b
higher volume
c
number of particles
d
higher temperature
Answer:
A
Explanation:
more particles means things are heating up
Ex: Water. More bubbles form once water reaches it boiling point
how can an xray image show differences between bone and soft tissues, such as muscles and lungs? How might the atoms that make up bones be different from the atoms that make up soft tissues?
Answer with Explanation:
1. An "x-ray image" shows the difference between the bones and soft tissues because the bones appear white in color while the soft tissues appear gray in color.
2. The reason behind the difference in the appearance of bones and soft tissues on the x-ray film is their density. Bones are denser than soft tissues, which means that its atoms are closely-knitted when compared to the soft tissues that are far apart from each other. This allows the x-ray radiation to be absorbed by the bone while it passes through most of the soft tissues.
This is the reason why pregnant women are advised not to undergo an x-ray examination because the fetus is denser and it will surely absorb the x-ray radiation.
An X ray is a X wave radiation that can penetrate from a high EMR and has wavelengths that are shorter than the UV rays. The concept of X rays where discovered in 1895.
The X ray image shows the difference between bones and the soft tissues. As the bones appear to be white in color and soft tissues appear grey in color. As lungs also consists of bones they can vividly shown. Due to the bones being made of calcium they are different form the atoms that makes the soft tissues.Learn more about the x-ray image show differences between bone and soft.
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Is this an element?
Cu20
O Yes, it's made of 1 type of atoms
O No it's made of more than 1 type of atoms
Answer:
Yes, its made of 1 types of atoms
Explanation:
Cu20 is Copper(I) oxide or cuprous oxide
A rectangular block of copper metal has a mass of 1896 grams. The volume of the block is 2cm^3. From this data, what is the density of the copper?(Please show how you got this answer)
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In order to carbonate soda, soda companies have to compress carbon dioxide close to 1250 mL of carbon dioxide at a pressure of 1.00 atm into a can with a volume of 225 mL. What is the pressure of carbon dioxide inside the soda can?
HELPPPPPPPP
Answer:
Pressure inside soda can = 5.56 atm
Explanation:
Given data:
Initial volume = 1250 mL
Initial pressure = 1.00 atm
Final volume = 225 mL
Final pressure = ?
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
1.00 atm × 1250m L = P₂ × 225 mL
P₂ = 1250 atm. mL/ 225 mL
P₂ = 5.56 atm
A van is traveling at 25.5 m/s starts to decrease steadily it comes to a complete stop in 7.65 seconds. What is the vans acceleration
Answer:
3.33
Explanation:
acceleration= vf-vi/t
What property can be used to separate oil from milk?
a. Magnetism
b. Density
c. Electricity
Answer:
Density oil will float
Explanation:
What does it mean when there is a coefficient placed before a molecule?
Provide two examples to explain your understanding.
Answer:
Coefficients are used in all chemical equations to show the relative amounts of each substance present. This amount can represent either the relative number of molecules, or the relative number of moles (described below). If no coefficient is shown, a one (1) is assumed.
Explanation:
When Nitrogen gas gets cold enough it can form a liquid. This liquid nitrogen is an
example of what?
A. A chemical change because it took a significant temperature drop to convert
nitrogen from gas to liquid.
B. A chemical change because the nitrogen underwent a conversion from gas to a
liquids.
C. A physical change because it was only a state change from solid to liquid.
D. A physical change because the temperature drop causes the molecules to completely rearrange.
Answer:
C.
Explanation:
Phase change is physical.
When Nitrogen gas forms a liquid is a physical change because it was only a state change from solid to liquid. Therefore, option C is correct.
What is a physical change?A physical change takes place when some of the features of the matter change but the identity of the material does not. Physical changes can be categorized as reversible and irreversible. For example, the melting of water is reversible since the melted ice can be refrozen.
Physical change can be described as a kind of change where only physical properties of matter such as solubility, color, odor, etc. can change. During physical changes in matter, there will be no chemical bonds are broken or formed between atoms in the molecule.
The chemical composition as well as the chemical nature of the material will remain unchanged while a physical change. The molecules can rearrange without changing the internal chemical composition of matter.
Therefore, changing the state of nitrogen gas is a physical change.
Learn more about physical change, here:
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(d) In the laboratory, the temperature is 295 K and the total pressure in the gas-collecting tube is 741.2 mmHg . If the vapor pressure of water at 295 K is 19.8 mmHg , determine the pressure of the H2(g) in the gas-collecting tube.
Answer: The pressure of the hydrogen in the gas-collecting tube is 721.3 mm Hg
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_{H_2O}+p_{H_2}[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = 741.1 mm Hg
[tex]p_{H_2O}[/tex] = partial pressure of water = 19.8 mm Hg
[tex]p_{H_2}[/tex] = partial pressure of hydrogen = ?
putting in the values we get:
[tex]741.1 mm Hg=19.8mmHg+p_{H_2}[/tex]
[tex]p_{H_2}=721.3mm Hg[/tex]
Thus the pressure of the hydrogen in the gas-collecting tube is 721.3 mm Hg
According to the Dalton Law in a blend of non-reacting gases, the entire pressure will be equivalent to the total of partial pressures of the individual gases.
The pressure of H₂ gas collected in the tube will be 721.3 mm Hg.
This can be calculated by:
Dalton's formula:
[tex]\text{p}_{\text{total}} & = \text{p}\text{H}_{2} \text{O} + \text{p} \text{H}_{2}[/tex]
Given :
[tex]\text{p}_{\text{total}}[/tex] = total pressure of gases = 741.1 mm Hg[tex]\text{p}\text{H}_{2} \text{O}[/tex] = partial pressure of water = 19.8 mm Hg[tex]\text{p} \text{H}_{2}[/tex]= partial pressure of hydrogen = ?Now using the formula we will calculate:
[tex]\text{741.1 mm Hg} & = \text{19.8 mm Hg} + \text{p} \text{H}_{2}[/tex]
[tex]721.3 \;\text {mm Hg} = \text{p} \text{H}_{2}[/tex]
Therefore, the pressure of the hydrogen in the tube is 721.3 mm Hg.
To learn more about Dalton Law follow the link:
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What is a paleontologist?
Consider the heating curve for water. At what temperature does the solid start melting? –20°C 0°C 20°C 80°C
Answer:
0°C
Explanation:
The melting point of water - the temperature at which solid water begins to melt - is 0°C at a pressure of 1 atm. In the heating curve of water, below 0°C we have solid water. Then, at 0°C the solid water starts to melt by forming liquid water. Above 0°C, when the total amount of water is in the liquid state, the liquid water begins to heat (it increases its temperature).
Answer:
the answer is 0 degrees C.
Explanation:
According to cell theory, where do plant cells come from?
A) organelles
B) other plant cells
C) protein synthesis
D) chemical reactions
Please help!