Answer:
A. It would float with about 80% of the cube below the surface of the water and 20% above the surface.
Explanation:
The choice that best describes what happens to cube of the given density value is that it would float with about 80% of the cube would be below the surface of the water and 20% above the surface.
Density is the mass per unit volume of a substance. The more mass a body has relative to volume, the great it's density. In short, density is directly proportional to mass and inversely related to volume.
The density of water is 1g/mL
If the density of the cube were to be the same with that of water, the substance will just mix up with water .
Here the density is less than that of water.
The density is 0.2g/mL
Therefore, 20% will stay afloat and 80% will be below the surface of the water.
Coach Ramirez made a cup of tea and stirred it with a spoon. The spoon became warm, How was the heat from the tea transferred to the spoon? *
Convection
Conduction
Radiation
Evaporation
Please help me thanks so much....I’ll mark you?!?!:))))(11 points)
Answer:
the first one
Explanation:
which of the following is NOT a clue that a chemical reaction has taken place?
A:release of gas
B:color change
C:mixing of the reactants
D:formation of a precipitate
Answer:
A
Explanation:
My reason is color change is an example
Mixing reactants is a chemical change clue
formation of precipitate is a clue
so that leaves A
What is the molar mass of magnesium
nitrate? Round to the nearest 0.01, and
include correct units AND substance
formula.
ANYONE CAN HELP ME WITH QUESTION PLEASE ?
Answer:148.31 Grams per mol
Explanation: It has been a long time since I took chemistry.
I believe you add up all the elements molar mass.
magnesium nitrate is Mg(NO3)2 so you add
MG 24.30
N 14.01 * 2 = 28.01
O 16.00 * 6 = 96.00
total is 148.31 grams per mol
I hope this helps.
The molar mass of magnesium nitrate is 148.31 grams per mol.
What is molar mass ?
The term molar mass is defined as the ratio between the mass and the amount of substance of any sample of the known compound. A mole of any substance is 6.022 × 10²³ molecules.
1 mole = 6.022 × 10²³ elementary entities.
The molar mass of a substance is calculated by adding the quality atomic masses in g/mol of the constituent atoms. Molar mass is represented by the symbol "M".
For calculating molar mass of magnesium nitrate is Mg(NO3)2
Mg = 24.30
Nitrogen = 14.01 × 2
= 28.01
Oxygen = 16.00 × 6
= 96.00
Therefore, molar mass of magnesium nitrate is Mg(NO3)2
= 24.30 + 28.01 + 96.00
= 148.31 grams per mol.
Thus, The molar mass of magnesium nitrate is 148.31 grams per mol.
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______ is a state function dealing with the disorder of the universe, and therefore the likelihood that a chemical reaction will take place. g
Answer: Entropy.
Explanation:
If we recall the laws of thermodynamics, there is a state function called entropy, that is related to the disorder in the system.
Such that, for example, in a gas expansion, we will have an increase in the "disorder" then we will have an increase in the entropy, this happens because we have more volume where the particles can be, then we have a larger number of "microstates" (or microscopic states, which refers to the states of the particles that conform the gas)
Particularly, when we go into statistical thermodynamics, there is something called the "Statistical entropy" that is related to the information theory, where the entropy depends on the number of possible outcomes that some event, like a chemical reaction, can have.
For a larger number of possible outcomes, we will have a larger entropy (we can think of this larger number of possible options as a disorder) and this entropy will be related to the statistical probability of each one of those outcomes.
Where the (most general) equation for the entropy is:
S = Kb*Σpₙ*ln(pₙ)
Where pₙ is the probability for the n-th outcome.
Kb is Boltzman's constant.
Which causes genetic variations and can result in different alleles?
predation rate
random mutations
competition
environmental changes
Answer:
Environmental Changes
Explanation:
Answer:
d
Explanation:
Draw the organic and inorganic products of the reaction, describe the type of bond cleavage, and classify the reaction.
Answer:
See explanation and images attached
Explanation:
The complete question his shown in the image attached to this answer.
This reaction is a substitution reaction. We identify it as a substitution reaction because one specie replaced another in the substrate.
The organic product and inorganic products were also shown in the image. The bond was breakage is a hetereolytic fission since the two electrons of the bond reside on only one of the species.
Could someone help as soon as possible PLEASEEEEEEEEE...
Answer:
A, D, E
Explanation:
a. "A dog panting to stay cool on a hot day" is a mechanism the dog employs to maintain it's body temperature. This is homeostasis.
d. "A bear hibernates in order to reduce their metabolism and conserve energy during the winter" is also all about keeping the internal condition of the bear's body constant. So this is also an example of homeostasis.
e. The lizard trying to keep regulate it's body temperature is also part of homeostasis.
3. Which compound has the greatest molar mass?
A. H2O B. C6H12O6 C. HNO3 D. C2H6
C₆H₁₂O₆ has the greatest molar mass (180 g/mol)
Further explanationGiven
Compounds of A. H2O B. C6H12O6 C. HNO3 D. C2H6
Required
The greatest molar mass
Solution
The molar mass(molecular mass-formula mass) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound
A. H₂O : 2.1+16 = 18 g/mol
B. C₆H₁₂O₆ : 6.12+12.1+6.16=180 g/mol
C. HNO₃ : 1.1+1.14+3.16=63 g/mol
D. C₂H₆ : 2.12+6.1 = 30 g/mol
Circle the letter of cach sentence that is true about silica.
a. It is formed from oxygen and nitrogen. b. It makes magma thicker, .
C. It is rarcly found in the crust,
d. It produces light-colored lava.
Answer:
The correct answer choices are B and D.
Explanation:
A volcanic eruption happens when magma reaches the surface of the earth. Depending on the amount of gas and the silica content of the magma, the lava and the type of eruption can vary. Silica, which forms from the elements silicon and oxygen, makes the lava thicker and less runny. When lava is thick, the volcanic eruption tends to be more explosive. The amount of silica also changes the color and density of the lava, which then makes different kinds of igneous rocks. As the gas content of the lava goes up, the eruption becomes more explosive.
Choose ALL of the factors that influence climate
Lesson 1.03
closeness to bodies of water
Altitude ( height above sea level)
latitude
geographic location
ocean currents
Answer: Its all of them
Explanation: I just took the test
What type of reaction is shown here?
6Li + Ca3(PO4)2 → 2Li3PO4 + 3Ca
In the laboratory you are asked to make a 0.175 m barium sulfide solution using 15.4 grams of barium sulfide. How much water should you add
Answer:
0.5195 liters of water
Explanation:
First we convert 15.4 grams of barium sulfide (BaS) into moles, using its molar mass:
15.4 g ÷ 169.39 g/mol = 0.0909 molThen we calculate the required volume of water, using the definition of molarity:
molarity = moles / volume0.175 M = 0.0909 mol / VolumeVolume = 0.5195 LWhen warm air is forced upward along a cold front what might happen?
Answer: With the cold front, warm air is rapidly forced upward (like the shavings) in advance of the actual front (the “cutter”), creating towering cumulus clouds, some hard showers and quite possibly a few gusty thunderstorms followed by a push of cooler and drier air in its wake.
Explanation:
what is the correct meaning of the word justify?
he was not sure how he would be able to justify. his actions to his family.
a. change for the better
b. prove to be right
c. claim to understand
d. describe in detail
what is a benefit of the artificial selection for the environment and explain it. please help!!
1x+cb=23
thios is right because math
How many molecules of water are required for the polymerization of a 22 monomer-long cellulose molecule
Answer:
21 molecules of water.
Explanation:
The polymerization of a 22-monomer long cellulose molecule will require 21 molecules of water. This is because the polymer bond is formed when the -OH group from the 1st monomer of the glucose unit and the H group from the 2nd monomer gets removed as a water molecule. This process is termed to be a condensation reaction.
1 If 5.80 L of gas is collected at a pressure of 92.0 kPa, what volume will the same gas occupy at 101.3 kPa if the temperature stays constant
Answer:
The volume that the same gas will occupy at 101.3 kPa if the temperature is kept constant is 5.27 L.
Explanation:
As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law that says:
"The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"
Boyle's law is expressed mathematically as:
P * V = k
Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:
P1 * V1 = P2 * V2
In this case, you have:
P1= 92 kPaV1= 5.80 LP2= 101.3 kPaV2= ?Replacing:
92 kPa* 5.80 L= 101.3 kPa* V2
and solving, you get:
[tex]V2=\frac{92 kPa* 5.80 L}{101.3 kPa}[/tex]
V2= 5.27 L
The volume that the same gas will occupy at 101.3 kPa if the temperature is kept constant is 5.27 L.
which if the following is not an example of chemical change
A.iron crusting
B.cutting paper
C. apple ripening
D.a piece of wood burning
How many moles are in 6.21x1025 atoms of magnesium oxide?
Answer: 55.56 moles of MgO
Explanation:
1 mole = avogadro number
if 6.21x10^25 atoms then molecules of MgO (equal numbers of Mg and O atoms)
= 0.5*6.21x10^25 = 3.105 molecules of MgO
So moles of MgO = 0.5*6.21*10^25/avogadro number = 55.56
Observe the sodium and chlorine atoms. Assuming that the inner rings are full of electrons, how many electrons are there total in each atom
Answer:
See explanation
Explanation:
Chlorine has three shells. We know that the first shell contains two electrons, the other shell has eight electrons while the last shell has seven electrons. This means that chlorine has seventeen electrons.
For sodium, there are also three shells. The first shell has two electrons as usual. The next shell has eight electrons while the last shell has only one electron. This makes a total of eleven electrons for sodium.
Answer: sodium-11
chlorine-17
Explanation: meow
An isotope has 15 protons, 16 neutrons, and 15 electrons. What is the isotopic notation of the isotope
Answer:
[tex]^{31}_{15}P[/tex] is the isotopic notation of the atom
Explanation:
The isotope notation is:
[tex]^a_bX[/tex]
Where a is the mass number = Number of protons + Number of neutrons
b is atomic number = Number of protons
The atomic number define the nature of the atom, the element with atomic number = 15 is phosphorus, P:
[tex]^a_bP[/tex]
a = 15 protons + 16 neutrons = 31
b = 15
[tex]^{31}_{15}P[/tex] is the isotopic notation of the atom.
A gas made up of homonuclear diatomic molecules escapes through a pinhole 0.936 times as fast as N2 gas. Write the chemical formula of the gas.
Answer:
See explanation
Explanation:
Let the rate of diffusion of the unknown gas be x
Let the rate of diffusion of nitrogen be y
Let molecular mass of unknown gas be MX
Let molecular mass of nitrogen be My
Hence;
x/y = √My/MX
0.936/1 = √28/MX
(0.936/1)^2= 28/MX
MX= 28/0.876096
MX= 32 g/mol
MX is O2 gas
An aqueous solution of 6.70 M ammonia, NH3, has a density of 0.950 g/mL. The percent by mass of NH3 in the solution is %.
Answer:
12.01% by mass
Explanation:
Percent by mass is 100 times the mass of solute (ammonia) over the mass of the solution. In molarity, we have the moles of ammonia per liter of solution. There are 6.70moles of NH3 in 1L. Thus, we need to convert the moles of ammonia to grams and the liters of solution to grams:
Mass ammonia - Molar mass: 17.031g/mol-
6.70moles * (17.031g / mol) = 114.1g NH₃
Mass solution:
1L * (1000mL / 1L) = 1000mL * (0.950g/mL) = 950g
Percent by mass:
114.1g NH₃ / 950g * 100 =
12.01% by massWhat is the mass of 0.5 moles of ammonia, NH3?
Answer:
Mass = 8.5 g
Explanation:
Given data:
Mass of ammonia = ?
Number of moles = 0.5 mol
Solution:
Formula:
Mass = number of moles × molar mass
Molar mass of ammonia = 17 g/mol
By putting values,
Mass = 0.5 mol × 17 g/mol
Mass = 8.5 g
Many reactions double their rates with every ten degrees rise in temperature. Assume that such a reaction takes place at 301 K and 311 K. What must its activation energy be for this statement to hold
Answer:
57.6 KJ/mol
Explanation:
We have that;
T1 = 301 K
T2= 311 K
k1 = k1
k2= 2k1
R = 8.314 JK-1
Ea= ?
So;
ln(k1/k2) = (-Ea/R) (1/T1 - 1/T2)
ln (k1/2k1) = -(Ea/8.314) (1/301 - 1/311)
ln(1/2) = -(Ea/8.314) (3.3 * 10^-3 - 3.2 * 10^-3)
-0.693 = -(Ea/8.314) 0.1 * 10^-3
-0.693/ 0.1 * 10^-3 = -(Ea/8.314)
-6930 = -(Ea/8.314)
Ea = 6930 * 8.314
Ea = 57.6 KJ/mol
Which substance can not be broken down by a chemical change?
A)
magnesium
B)
water
C)
methane
D)
ammonia
Answer:
a
Explanation:
its too much of a solid to be broken down
The substance can not be broken down by a chemical change is A)magnesium.
What is a substance?substance can be regarded as a particular kind of matter which posses a uniform properties.
Therefore, during a chemical change all the given substance can be broken down because they are compounds, but magnesium is an element which cannot be broken down.
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50POINTS!
If I held a 45.3 moles of a gas at a constant volume of 56.4L and a temperature 310.5k, what is the pressure being exerted on the gas?
A. 20.5 atm
B. 27.7 atm
C. 23.9 atm
D. 17.4 atm
Answer:
A. 20.5 atm
Explanation:
Using the formula Pv=.nRt
Answer:
PV=nRT
P(56.4)=45.3×0.08206×310.5
P=1154.227/56.4
=20.4650
Approximately 20.5 then A is the answer
a change in matter in which the density of the inatter
stays the same
Answer: A physical property that will be the same regardless of the amount of matter. Extensive Properties: A physical property that will change if the amount of matter changes.
When an alkene is subjected to treatment with Hg(OAc)2 in alcohol followed by reaction with NaBH4, what new class of compound is formed
Answer:
The new class of compound formed is an alcohol.
Explanation:
The treatment of an alkene with Hg(OAc)₂ in alcohol followed by reaction with NaBH₄ gives an alcohol. This reaction is known as oxymercuration-demercuration reaction. It is a two-step pathway which proceeds in the Markovnikov manner. In this reaction, the alkene react with the Mercury salt (Hg(OAc)₂) and a nucleophile (alcohol) to form an organomercury intermediate. The intermediate's carbon-mercury bond is then converted to carbon-hydrogen bond by the reaction with NaBH₄. An alcohol is then produced.