7.
A 27.8 L balloon is filled with 7.52g of gas X and placed next to a 27.8 L balloon filled with helium.
Given that Helium has a density of 0.179g/L, which statement correctly explains the movement of the balloons
with valid justification?
a) The balloon filled with helium will float higher because helium is less dense than gas X
b) The balloon filled with gas X will float higher because gas X is less dense than helium
c) Both balloons will float to the same level because their densities are the same
d) Both balloons will float to the same level because their volumes are the same
e) There is not enough information to determine the movement of the balloons
Answer:
a) The balloon filled with helium will float higher because helium is less dense than gas X
Explanation:
Since gases are known to not have fixed density, they take up the density of their containers, let us find the density of the gas in first balloon.
Density is the mass per unit volume;
Density = [tex]\frac{mass}{volume}[/tex]
Insert the parameters and solve;
mass of gas = 7.52g
volume of the gas = 27.8L
Density = [tex]\frac{7.52}{27.8}[/tex] = 0.271g/L
Let us compare the two densities;
Density of gas = 0.271g/L
Density of helium = 0.179g/L
We see that the density of the gas is higher than that of helium, so, it not float as high as the balloon with helium. The balloon with helium is lighter.
is silver tarnishing a physical change or a chemical change?
Answer:
chemical
Explanation:
Some bronze objects tarnish to a dark brown color. Chemical properties can be identified by the changes they produce. The change of one substance into another substance is called a A piece of wood burning, an iron fence rusting, and a silver spoon tarnishing are all examples of chemical changes.
Which receptors are responsible for the production of saliva?
Answer:
taste receptor
Explanation:
Good luck :)
A_________is the distance from one compression to the next compression in a longitudinal wave. (Page 2 Vocabulary)
A.frequency
B.rarefaction
C.amplification
D.wavelength
Answer:
wavelength
Explanation:
What is the energy of a photon with a frequency of 3.2 x 10 -2 Hz?
Answer:
E = 21.22 ×10⁻³⁶ J
Explanation:
Given data:
Energy of photon = ?
Frequency of photon = 3.2×10⁻² Hz
Solution:
Formula:
E = hf
h = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
E = 6.63×10⁻³⁴ Js × 3.2×10⁻² Hz
E = 21.22 ×10⁻³⁶ J (Hz= s⁻¹)
An exacuted glass vessel weighs 50 g when empty, 148g when filled with an liquid of density o.989/cc and 50.5 g whenfilled with an ideal gas760 mmHg and at 300k. Determine the molecular weights of gss.
MW of gas : 124.12 g/mol
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
glass vessel wieight = 50 g
glass vessel + liquid = 148 ⇒ liquid = 148 - 50 =98 g
volume of glass vessel :
[tex]\tt V=\dfrac{m}{\rho}=\dfrac{98}{0.989}=99.1~ml[/tex]
An ideal gas :
m = 50.5 - 50 = 0.5 g
P = 760 mmHg = 1 atm
T = 300 K
[tex]\tt PV=\dfrac{mass(m)}{MW}.RT\\\\MW=\dfrac{m.RT}{PV}\\\\Mw=\dfrac{0.5\times 0.082\times 300}{1\times 0.0991}=124.12~g/mol[/tex]
Where do convection currents occur?
A.
In areas with the same temperature
B.
In areas with different air pressures
C.
In areas with the same altitude
D.
In areas with different cloud types
Answer:
a because where the air travels for example a radiator
Answer:
C.
In areas with the same altitude
Explanation:
What is the specific heat of a substance that absorbs 2500 joules of heat when a sample of 100g of the substance increases in temperature from 10.°C to 70.°
Answer:
0.417 J/gºC
Explanation:
From the question given above, the following data were obtained:
Heat (Q) absorbed = 2500 J
Mass (M) of substance = 100 g
Initial temperature (T1) = 10 °C
Final temperature (T2) = 70 °C
Specific heat capacity (C) =?
Next, we shall determine the change in temperature (ΔT). This can be obtained as follow:
Initial temperature (T1) = 10 °C
Final temperature (T2) = 70 °C
Change in temperature (ΔT) =?
Change in temperature (ΔT) = T2 – T1
Change in temperature (ΔT) = 70 – 10
Change in temperature (ΔT) = 60 °C
Finally, we shall determine the specific heat capacity of the substance as follow:
Heat (Q) absorbed = 2500 J
Mass (M) of substance = 100 g
Change in temperature (ΔT) = 60 °C
Specific heat capacity (C) =?
Q = MCΔT
2500 = 100 × C × 60
2500 = 6000 × C
Divide both side by 6000
C = 2500 / 6000
C = 0.417 J/gºC
Therefore, the specific heat capacity of substance is 0.417 J/gºC
Dana is trying to determine if an unknown sample is a pure substance or not. The sample has a cloudy white color, and it seems evenly mixed throughout. The sample is a liquid with high viscosity. Dana tried separating the sample with a magnet with no effect. When Dana filtered the sample, larger granules of the sample were left behind in the filter. What evidence allowed Dana to conclude that the sample is NOT a pure substance?
It has a cloudy white color.
The liquid has high viscosity.
Dana tried separating the sample with a magnet with no effect.
Dana filtered the sample and larger granules of the sample were left behind.
Answer:
Dana filtered the sample and larger granules of the sample were left behind.
Explanation:
If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.
One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.
Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.
Give the applications of EMF measurement
Answer: Determination of Equilibrium Constant, Determination of Solubility Products, Determination of pH, Determination of Activity Coefficients,
Explanation:
An example of a decomposer is a:
rabbit
mushroom
tulip
Answer:
mushroom
Explanation:
Redi placed pieces of meat in several jars. He divided the jars into two groups. He covered the first group of jars with fine cloth. He left the second group of jars uncovered. Redi observed the jars for several days. He saw flies on the cloth of the covered jars, and he saw flies laying eggs on the meat in the uncovered jars. Maggots appeared only on the meat in the group of jars left uncovered.
What is the question in Redi's experiment?
What is the independent (test) variable?
What is the dependent (outcome) variable?
Write a hypothesis for Redi's experiment
Answer:
Experiment Question, Independent & Dependent Variable, Null & Alternate Hypothesis
Explanation:
Experiment Question : Whether fine cloth coverage over chicken jars effect flies & their eggs in ambience ?
Independent Variable : The causal variable, ie cloth cover existence on the chicken jar
Dependent Variable : The resultant variable, ie presence of flies & their eggs near jar, meat
Null Hypothesis [H0] : Cloth cover on chicken jar doesn't effects flies' & eggs' presence around jar, chicken.
Alternate Hypothesis [H1] : Cloth cover on chicken jar effects flies' & eggs' presence around jar, chicken.
Which list contains only animal phyla? mosses, annelids, conifers, chordates mosses, ferns, conifers, flowering plants cnidarians, mollusks, annelids, arthropods, echinoderms, chordates cnidarians, ferns, annelids, arthropods, echinoderms, flowering plants
Answer:
cnidarians, mollusks, annelids, arthropods,
Explanation:
Living organisms have been grouped using a system of classification that runs from Kingdom to Species. One of those kingdoms is KINGDOM ANIMALIA, which consists of animal species i.e. organisms that are strictly heterotrophic and eukaryotic.
The next taxa after kingdom is PHYLA. According to this question, the phyla which consists of only animals are cnidarians, mollusks, annelids, arthropods. Other options contain ferns, mosses, and flowering plants which belong to Kingdom Plantae.
Answer:
on edge its C
Explanation:
can someone help me identify the elements please, i rlly need help
Answer:
1 : any of more than 100 substances that cannot by ordinary chemical means be separated into different substances Gold and carbon are elements. 2 : one of the parts of which something is made up There is an element of risk in surfing. 3 : the simplest principles of a subject of study the elements of arithmetic.
Explanation:
Which of the following is not a subatomic particle?
O Electron
O Neutron
O Nucleus
O Proton
The nucleus is not a subatomic particle, but rather made of the subatomic particles of protons and neutrons. An electron is also a subatomic particle, but it is not found in the nucleus. There are many other subatomic particles, but your teacher probably won't go over those terms until later.
Convert the measurement into scientific notation. 1.25ml
Answer:
The number "1.25" is already at a number that shouldn't be determined using scientific notation. Do you want 1.25ml----> liters ? If so, here
Explanation:
1.25 × [tex]10^{-3}[/tex]
is the amount of liters
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Which formula represents a tetrahedral molecule?
LiBr
CO2
H₂
SIF4
um this is kinda weird I am take a guest SIF4
The formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4
From the question,
We are to determine which of the given formulae represents a tetrahedral molecule
In order to determine the molecule that represents a tetrahedral molecule, we will determine which of the molecules has a tetrahedral molecular geometry.
A tetrahedral molecular geometry has a central atom located at the center with four substituents that located at the corners of a tetrahedron
Among the given options, the molecule that has four substituents is SiF₄. Si is the central atom and the F atoms are the substituents.
Hence, the formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4
Learn more here: https://brainly.com/question/2108211
H2 (g) + F2 (g) ----- > HF(g) *
What type of reaction?
Answer: Hydrogen fluoride
Explanation:
What were some dangers associated with early ballon flights?
Explanation:
The dangers of ballooning were apparent to aeronauts and the general public. From the early 1800s, attempts to fly over water too often ended in disaster or a narrow escape. Some of the best known aeronauts on both sides of the Atlantic set off across a large body of water never to be seen again.
Help please! Tell me which one goes where.
Answer:
human-F
chicken-D
rabbit-E
tortoise-C
salamander-B
fish-A
Explanation:
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Answer:
D Tortoise
B Salamander
A Fish
C Chicken
F Human
E Rabbits
Explanation:
I Really have an Explanation
How can a mixture be separated?
Answer:
Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
The stability and inert nature of noble gases is caused by:
a full d sublevel
a full f sublevel
a full p and a full d sublevel
a full s and a full p sublevel
Answer: a full s and a full p sublevel
Explanation: "noble gases. They are an especially important group of the periodic table because they are almost completely unreactive, due to their completely filled outermost s and p sublevels."
Which chemical family below would the element iodine most likely belong to?
The chemical family that the element iodine should belong to is halogen.
The following information related to the halogen is:
It is the subset that has chemical elements i.e. reactive. It is in Group 17 on the periodic table that should be existed in the environment as the compounds instead of the pure elements.The other type of halogens should consist of fluorine (F), chlorine (Cl), etc.Therefore we can conclude that the chemical family that the element iodine should belong to is halogen.
Learn more: brainly.com/question/13145357
Explore the Build an Atom simulation. Identify one interesting function, quality, or graphic in the simulation.
Answer:
- Adding protons changes the identity of the atom, adding one moves from the right to left on the Periodic Table.
PLEASE HELP
Determine the pressure in kPa that 5.14g of carbon monoxide has when it occupies a volume of 20.00L at 313K.
Do you go to Millbrook? 23.9kPa
Use the decoder to get the lock combination
Answer:
u didnt attach an image or anything so this is quite confusing.
Explanation:
??
Answer:
Okay
Explanation:
Hi I really need help 7th grade science Water gets soaked up by a paper towel because of the property of blank Adhesion Cohesion Deposition Evaporation
Answer:
Adhesion
Explanation:
Water is soaked up by a paper towel because the forces of adhesion exceeds the forces of cohesion.
The forces of adhesion binds the water molecule to the paper towel while the forces of cohesion binds the water molecules to each other.
Adhesion of water to the walls of the paper exerts an upward force that draws water molecules up the paper.
Hence, the movement of water up a paper towel occurs when the forces of adhesion to the walls of the paper is greater than the forces of cohesion acting between the water molecules.
How many moles are there in 3.612 x 1024 formula units of Na2SO4?
Answer:
Theanswer is 6 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.612 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
6 molesHope this helps you
Which metallic crystal structure has a coordination number of 8
Answer:
body-centered cubic
Explanation:
:D
HELP ME PLSSSS
Which *TWO* statements explain ways in which cells get nutrients
A. The nucleus provides the instructions for making proteins from amino acids.
B. Mitochondria change energy stored in organic compounds into a usable form
C. Transport proteins help molecules cross cell membranes.
D. A chloroplast converts energy from sunlight into organic matter
Answer:
i am not sure but
Explanation:
b and c should be correct
Answer:b and D
Explanation: