Answer: D.) melting ice
Explanation:
An exothermic reaction is a chemical reaction that releases energy through light or heat
hope this helps :D
A gas made up of atoms escapes through a pinhole times as fast as gas. Write the chemical formula of the gas.
A gas made up of atoms escapes through a pinhole 0.225times as fast as gas. Write the chemical formula of the gas.
Answer:
Explanation:
To solve this problem, we must apply Graham's law of diffusion. This law states that "the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molecular mass at constant temperature and pressure".
Mathematically;
[tex]\frac{r_{1} }{r_{2} } = \frac{\sqrt{m_{2} } }{\sqrt{m_{1} } }[/tex]
r₁ is the rate of diffusion of gas 1
r₂ is the rate of diffusion of gas 2
m₁ is the molar mass of gas 1
m₂ is the molar mass of gas 2
let gas 2 be the given H₂;
molar mass of H₂ = 2 x 1 = 2gmol⁻¹
rate of diffusion is 0.225;
i .e r1/r2 = 0.225
0.225 = √2 / √ m₁
0.225 = 1.414 / √ m₁
√ m₁ = 6.3
m₁ = 6.3² = 39.5g/mol
The gas is likely Argon since argon has similar molecular mass
How far can a caterpillar, traveling at 0.05 m/s, move in 3 min?
Answer:
9m
Explanation:
Given parameters:
speed of caterpillar = 0.05m/s
time taken to move = 3min
Unknown:
distance covered by the caterpillar = ?
Solution:
Speed is defined as the rate of change of distance with time. It is a scalar quantity that does not measure direction but has magnitude;
Speed = [tex]\frac{distance}{time}[/tex]
Distance = speed x time
We need to convert the given time to seconds;
1 min = 60s
3 min = 60 x 3 = 180s
Input the variables;
distance = 0.05m/s x 180s = 9m
PLS ANSWER FAST, WILL GIVE BRAINLIEST.
Which idea gives the main idea of the kinetic theory of heat?
(a) Colder objects emit more radiation than hotter ones.
(b) When objects are heated, particles slow down.
(c) Heat is transferred by the interaction of moving particles.
(d) Heat flows from warmer to colder objects.
Answer:
(d) Heat flows from warmer to colder objects.
**wrong
answer is C
Answer:
heat flows from warmer to colder objects
Materials can be classified as solids liquids or gases based on whether their shapes and ______ are definite or variable
Answer:
Materials can be classified as solids, liquids, or gases based on whether their shapes and volumes are definite or variable. LIQUIDS: Have a definite volume but change shape · Particles are close together, but not held as tightly as a solid.
Explanation:
Look at the position of Location 1, Location 2, and Location 3 in this picture. Simple diagram of a lake represented by a wavy circle. The circle is labeled 'Lake,' and there are three points outside of the lake: 'Location 1' is to the northeast of the lake, 'Location 2' is to the east of the lake, and 'Location 3' is to the southwest of the lake. Which of these statements is most likely correct about the climate of the three locations? Location 3 is cooler than Location 1 and Location 2. Location 1 is cooler than Location 2 and Location 3. Location 3 is warmer than Location 2 and Location 1. Location 1, Location 2, and Location 3 are equally warm.
Answer: Location 3 is warmer than location 2 and 1
Explanation:
The statement "Location 3 is warmer than Location 2 and Location 1" is most likely correct based on their positions relative to the lake.
Based on the positions of Location 1, Location 2, and Location 3 in relation to the lake, we can make some assumptions about their climates:Location 1, being to the northeast of the lake, is likely to have a cooler climate compared to Location 2 and Location 3. This is because prevailing winds often come from the west (from the lake towards Location 1), bringing cooler air and potentially moderating temperatures.Location 2, being to the east of the lake, may have a milder climate compared to Location 1 but not as warm as Location 3. It might benefit from the moderating influence of the lake on its eastern side.Location 3, situated to the southwest of the lake, could experience relatively warmer temperatures compared to the other two locations. This is because it is likely to receive more direct sunlight and less cooling influence from the lake.For more such questions on statement
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which sequence of group 18 elements demonstrates a gradual decrease in forces of attraction
Answer: Xe, Kr, Ar, Ne
Explanation:
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How the relative density of a substance is related to the density calculate the density of iron if its relative density is 2 and a density of water is 2gcm -3
Answer:
How the relative density of a substance is related to the density calculate the density of iron if its relative density is 2 and a density of water is 2gcm -3
R.d= relative density of substance/ relative density of water
R.d= 2/2
R.d= 1gcm-3
Explanation:
Density of water=1000 kg/m^3. Relative density= density of substance/density of water. Relative density=7800/1000=7.8 · The radius of a solid sphere is 2 cm.
The relative density can be calculated directly by measuring the density of the sample and dividing by the (known) density of the reference substance. The density of a sample divided by its volume is the relative density of the sample, also known as specific gravity. The relative density of a substance is a pure number that has no units. It tells how many times a substance weighs more than water. The relative density (R.D) of a substance is calculated by dividing the density of a substance by the density of water. The relative density of a substance is the ratio of the density of the substance to that of water. And since it is the ratio of density to density. Hence, it is singular
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If heat flows out of a system, the heat change (AH) will be
, and the reaction will be
Answer: Heat change will be negative and reaction is exothermic.
Explanation:
In any system that involves heat flowing out of the system, (that is heat loss), the heat change will be negative and the reaction will be exothermic.
light energy from the sun is converted into what kind of energy by green leaves?
Which gas in the Earth's atmosphere turns into precipitation?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) water vapor
Answer:
D) water vapor
Explanation:
why is sodium more reactive than magnesium
Answer:
Mg has two valence electrons
Explanation:
Na has only one valence electron, so it readily donates that electron to other atoms to achieve an octet.
Mg must lose two valence electrons to get an octet. It takes extra energy to remove the second electron. In addition, the two electrons are in a filled s subshell, which has added stability.
How can understanding atomic light help astronomers determine what planets are composed of?
The most common method astronomers use to determine the composition of stars, planets, and other objects is spectroscopy. This process utilizes instruments with a grating that spreads out the light from an object by wavelength. This spread-out light is called a spectrum. Every element has a unique fingerprint that allows researchers to determine what it is made of.
The fingerprint often appears as the absorption of light. Every atom has electrons, and these electrons like to stay in their lowest-energy levels. But when photons carrying energy hit an electron, they can push it to higher energy levels. This is absorption, and each element’s electrons absorb light at specific wavelengths related to the difference between energy levels in that atom. But the electrons want to return to their original levels, so they don’t hold onto the energy for long. When they emit the energy, they release photons with exactly the same wavelengths of light that were absorbed in the first place. An electron can release this light in any direction, so most of the light is emitted in directions away from our line of sight. Therefore, a dark line appears in the spectrum at that particular wavelength.
Because the wavelengths at which absorption lines occur are unique for each element, astronomers can measure the position of the lines to determine which elements are present in a target. The amount of light that is absorbed can also provide information about how much of each element is present.
How many moles of glucose are in 19.1 g of glucose?
Answer:
The mole of glucose is 0.106mol
Explanation:
Glucose - C6H12O6
We will calculate the molar mass of glucose
C - 12
H - 1
O - 16
6 moles of carbon, 12 moles of hydrogen and 6 moles of oxygen
Mm = 6 * 12 + 12 * 1 + 16 * 6
= 72 + 12 + 96
= 180g/mol
Using the formula
n = m/Mm
n - number of mole
m - number of mass
Mm - number of molar mass
n = 19.1g/180g/mol
= 0.106g/mol
please help i’m lost
Answer:
73.49 atm
Explanation:
The balance chemical equation is as follow,
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
Given Data:
Temperature = T = 373 K
Volume = V = 2.5 L
Gas Constant = R = 0.0821 atm.L.mol⁻¹.K⁻¹
To find:
Pressure: P = ?
Formula:
P V = n R T
P = n R T / V
Here we also need to find number of mole,
According to balanced equation,
1 mole of C₃H₈ on combustion gives = 3 moles of CO₂
So,
2 moles of C₃H₈ on combustion will give = X moles of CO₂
Solving for X,
X = 2 moles of C₃H₈ × 3 moles of CO₂ ÷ 1 mole of C₃H₈
X = 6 moles of CO₂
Moles = n = 6 mol
Solution:
P = 6 mol × 0.0821 atm.L.mol⁻¹.K⁻¹ × 373 K ÷ 2.5 L
P = 73.49 atm
What is the equation used to calculate momentum
Answer:
Momentum=mass*velocity
Explanation:
Answer: It's a term that describes a relationship between the mass and velocity of an object, and we can see this when it is written in equation form, p = mv, where p is momentum, m is mass in kg and v is velocity in m/s. Because momentum is a vector quantity, this means it has both magnitude and direction.
Explanation:
Convert 7.50 grams of glucose C6H12O6 to moles
Answer:
0.04167mole
Explanation:
To convert gram to mole,
C6H12O6
C - 12
H - 1
O - 6
There are 6 moles of C, 12 mole of H and 6 mole of O
Therefore, multiply each number of mole by the mass of each element
C - 12 * 6 = 72
H - 1 * 12 = 12
O - 16 * 6 = 96
The molar mass of C6H12O6 = 72 + 12 + 96
= 180g/mol
Dividing the number of mass by the mm
= 7.50g / 180g/mol
= 0.04167 mole
What is the equation used to calculate momentum
p=mv
where p = momentum
m = mass
v = velocity
Which activities describe the use of technology in science? Check all that apply.
looking at cells through a microscope
viewing stars through a telescope
observing a plant with the unaided eye
creating a blank data table by hand in a notebook
developing a computer model for earthquakes
The activities describe the use of technology in science is as follows:
looking at cells through a microscopeviewing stars through a telescopedeveloping a computer model for earthquakesThe use of technology in science involves various activities that enhance observation, data collection, analysis, and modeling. The activities that describe the use of technology in science include:
1. Looking at cells through a microscope: Microscopes are essential technological tools that enable scientists to observe and study microscopic structures, such as cells and microorganisms.
2. Viewing stars through a telescope: Telescopes are advanced optical instruments that allow astronomers to study distant celestial objects, stars, galaxies, and other astronomical phenomena in detail.
3. Developing a computer model for earthquakes: Creating computer models using specialized software and simulations is a crucial aspect of scientific research, particularly in fields like seismology, where scientists model earthquake behavior to understand and predict seismic activity.
Activities that do not directly involve technology include:
1. Observing a plant with the unaided eye: This activity relies solely on natural vision without the use of technological instruments.
2. Creating a blank data table by hand in a notebook: While this activity may involve manual recording, it doesn't necessarily involve the use of advanced technology. However, the data recorded in these tables can later be processed using technology.
In summary, the use of technology in science is evident in activities that rely on advanced tools and instruments, data analysis software, and computer modeling to enhance scientific research and understanding.
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What can you conclude about the classification of boron
Answer:
Boron is a Metalloid Element
Explanation:
Final answer:
Boron is classified as a metalloid due to its electron configuration and covalent bonding nature, differing from other group 13 elements by not forming a stable B³+ ion and showcasing a range of compounds with multicenter bonding and fractional oxidation states.
Explanation:
Classification of Boron:
Boron is a unique element classified as a metalloid. It shares properties with both metals and nonmetals, which is evident in its covalent bonding patterns and its ability to form compounds such as boranes and organoboranes. Unlike its group 13 counterparts, boron does not form a stable B³+ ion due to high ionization energies. Instead, its chemistry is dominated by covalent bonding. Boron's 2s²2p¹ outer electron configuration results in an electron deficiency, allowing it to form unusual oxidation states, including fractional ones in boron hydrides. Boron is more electropositive than carbon and hydrogen, contributing to its ability to form covalent bonds with a variety of elements, resulting in a vast range of boron compounds.
Though often compared to silicon and carbon due to its covalency and potential for cluster formation, boron distinctively diverges in properties, such as preferring multicenter bonding. Its peculiar chemistry is also highlighted by its capability to adhere to the sextet rule rather than the octet rule, an example being its stable formation with hydrogen (BH).
Suppose 50.0 ml of 0.125 M HCl is mixed with 75.0 ml of 0.200 M Ca(OH)2.
a) Calculate the concentration, in moles per liter, of each of the ions present after mixing. Assume that the volumes are additive.
b) Which is greater, moles of H+ or moles of OH-?
c) How much more of the greater one do you have? Determine the concentration.
Answer:
b) Which is greater, moles of H+ or moles of OH-?
Explanation:
suppose 50.0 mL of 0.250 M CoCl2 solution is added to 25.0 mL of 0.350 M NiCl2 solution . ... [2*(50*0.250)+2*(25*0.350)]/75=0.567 M. 0 3 0.
Answer:
b) Which is greater, moles of H+ or moles of OH-?
Explanation:
Have a great day
the density of a mineral is 2.6g/cm* what is the specific gravity
The specific gravity of a substance is a measure of its density in comparison to water. In your case, the specific gravity of the mineral would be 2.6 because its density is 2.6 times that of water.
Explanation:Answer
The specific gravity of a substance is the ratio of the density of a substance to the density of a reference substance, often water. Given that the density of the mineral in question is 2.6g/cm^3, which is equal to the density of the mineral in water, we can say that the specific gravity is 2.6. This is because the specific gravity is a dimensionless quantity; it has no units. So, the specific gravity of a substance with a density identical to that of water would be 1. Since in your case, the mineral density is 2.6 times that of water, the specific gravity would be 2.6.
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*Multiple Choice:
1. Which of the following is NOT one of the six purposes listed in The Constitution?
Answer:
k
Explanation:
Answer:
What is the following
Explanation:
Aluminum has a density of 2.70 g/ cm3. What volume is occupied by a block of aluminum which weighs 4.32 kg?
Answer:
1600cm3
Explanation:
From the question given, we obtained the following:
Density = 2.70g/cm3
Mass = 4.32kg :we need to convert the mass to grams
Mass = 4.32kg = 4.32 x 1000 = 4320g
Volume =?
Recall : Density = Mass /volume
Volume = Mass /Density
Volume = 4320/2.70
Volume = 1600cm3
The volume occupied by a block of aluminum which weighs 4.32 kg is 1600cm³.
DENSITY:The density of a substance can be calculated by dividing the mass of the substance by its volume. This means that the volume can be calculated thus;Volume = mass (g) ÷ density (g/cm³)
According to this question, a block of aluminum has a density of 2.70 g/cm³ and a mass of 4.32kg.Mass in grams = 4.32 × 1000 = 4320g
Volume = 4320g ÷ 2.70g/cm³
Volume = 1600cm³
Therefore, the volume occupied by a block of aluminum which weighs 4.32 kg is 1600cm³.
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A sample of an unknown compound contains 0.350 moles of sulfur and 1.05 moles of oxygen. The molecular mass of the compound is 240.18 g/mol. What is the molecular formula of this compound?
Answer:
true
Explanation:
1. How does hydrogen bonding affect water molecules?
A Hydrogen bonding holds two hydrogen atoms to one oxygen atom in a
water molecule.
B Hydrogen bonding causes the polarity and bent angle of a water
molecule.
C Hydrogen bonding is the main force that attracts water molecules to
one another.
Answer:
C Hydrogen bonding is the main force that attracts water molecules to
one another.
Explanation:
Hydrogen bonding affects water molecules because, it is the main force which holds and attracts water molecules to one another.
Hydrogen bonding is an intermolecular force.Intermolecular forces holds molecules together. Examples are van der waals forces, hydrogen bonding. In a hydrogen bonding, hydrogen of one molecule electrostatically combines with a more electronegative specie usually nitrogen, flourine and oxygen on another atom. This attraction results in hydrogen bonding between two or more molecules. The unique and anomalous behavior of water is as a result of these hydrogen bonds between its molecules.A balloon is taken to a mountain top and inflated with helium to a volume of 5.0 L. The balloon is then released and rises to an altitude where the helium has a new volume of 25.0 L and a pressure of 0.18 atm.
Which of the statements below is correct?
A. At the new altitude, the pressure inside the balloon is greater than the pressure outside.
B. At the new altitude, the pressure outside the balloon is greater than the pressure inside.
C.At the mountain top, the pressure inside the balloon is lower than at the new altitude.
D. At the mountain top, the pressure inside and outside the balloon is the same.
What was the pressure inside the balloon before it was released from the mountain top?
A. 0.18 atm
B. atm
C. 1.00 atm
D. 1.11 atm
Answer:
C.At the mountain top, the pressure inside the balloon is lower than at the new altitude.
Explanation:
The gas laws will come handy in predicting pressure, volume and temperature relationships of a given amount of gas.
Given parameters:
Volume at mountaintop = 5.0L
New volume at altitude = 25.0L
New pressure at altitude = 0.18atm
Pressure at mountaintop = ?
Here we are dealing with pressure and volume relationships between two given gases. The best law that gives a good prediction of what happen is the Boyle's law.
The law states that "the volume of a fixed mass(mole) of a gas varies inversely as the pressure changes, if the temperature is constant".
Mathematically;
P₁V₁ = P₂V₂
P₁ is the pressure at mountaintop
P₂ is the pressure at new altitude
V₁ is the volume at mountaintop
V₂ is the volume at new altitude.
From the definition of Boyle's law, we can clearly conclude that at the new altitude, the gas expands due to low pressure and will attain a new volume.
The pressure at mountaintop;
P₁ x 5 = 25 x 0.18
P₁ = 0.9atm
We can clearly see that at the mountaintop, the balloon has a higher pressure that confines the helium gas inside the balloon to a lower space.
An inverse relationship thus exists between volume and pressure
4. In a crystal, the particles are arranged in
A ball-like shapes of varying sizes
B sheets or layers that can separate from one another
C an orderly, repeating, three-dimensional pattern
D a random pattern that does not repeat
The correct answer is C
In a crystal, the particles are arranged in an orderly, repeating, three-dimensional pattern.
Option C
Explanation:
Solid crystal particles can be ions, molecules or atoms, based on the material kind. The three-dimensional solid crystal system is called the crystal lattice. The crystals are divided into general categories according to their shape.
The crystal is characterized by faces that intersect at specific angles characteristic of this material. Crystal is a material in which particles get arranged in an ordered, repeatable, three-dimensional way. Means, a solid contains an atomic patterns that is uniformly repeated in three dimensions.
convert Gas pressure from 12.02 psi to pressure in kPa
Answer: 82.9kPa
Explanation:
Gas pressure can be measured in several units, they include psi (pound per square inch), kPa (kilo pascal).
Recall that:
1 Kilopascal (kPa) = 0.14503773779 psi
So, let Z kPa = 12.02 psi
To get the value of Z, cross multiply
12.02 psi x 1kPa = 0.14503773779 psi x Z kPa
12.02 = 0.14503773779Z
Divide both sides by 0.14503773779
12.02/0.14503773779 = 0.14503773779Z/0.14503773779
82.9 kPa = Z
Thus, the 12.02 psi is equivalent to 82.9 kPa
Final answer:
To convert 12.02 psi to kPa, multiply it by the conversion factor of 6.89476, giving 82.914 kPa.
Explanation:
The student is asking to convert gas pressure from psi to kPa, which involves using a conversion factor. The value in psi needs to be multiplied by the conversion factor to find the equivalent pressure in kPa. According to the given information, 1 psi is approximately equal to 6.89476 kPa.
To perform the conversion from 12.02 psi to kPa:
Multiply 12.02 psi by the conversion factor of 6.89476 kPa/psi.
12.02 psi imes 6.89476 kPa/psi = 82.914 kPa.
So, the pressure of 12.02 psi can be converted to 82.914 kPa.
What is the SI unit for amount of a substance?
Answer:
Mole
Explanation:
Answer:
The SI unit for the amount of a substance is mole.
Explanation:
SI unit stands for International System of units. It is the standard system of unit of measurements.
SI unit defines the amount of substance to be proportional to the number of entities present. It's unit for the amount of substance is mole. Also, the unit symbol for mole is mol.
a mug of boiling hot water sits next to a glass of ice water how does the movement of water molecules change in each case?
Answer: In the hot cup, they would be moving super fast, while in the cold cup they would just be fast.
Explanation:
Solids are stagnant, while liquids molecules are fast.