Answer:
Shale
Explanation:
Answer: Shale
Explanation:
What is the mass in grams of 2.33 x 1020 atoms of Na?
answer and explnation on the picture if you have any quation let me know
Between ethane and ethene, ethane is the most reduced substance. Explain why
please hurry
The modern periodic table is organized by:
O atomic number
O number of protons in each element
O atomic weight
hing
chemical properties
Answer:
Atomic number
Explanation:
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
The Modern periodic table is organized on the basis of increasing atomic Number.
Olivia is visiting her cousin Meg in Australia for Christmas. She is packing some beachwear to enjoy the beach during her Christmas vacation in Australia. Her friend Holly is puzzled as to why she’s packing beachwear for a December vacation.
Choose all the statements that Olivia can use to explain the reason to her friend Holly.
Group of answer choices
At any given time, different parts of Earth experience different seasons.
At any given time, all parts of Earth experience the same season.
Summer occurs when sunlight reaches the northern or the southern hemisphere directly.
Summer Occurs when sunlight reaches the northern or the southern hemisphere indirectly.
When the southern hemiphere is tilted towards the sun, it receives more sunlight, so southern hemisphere experiences summer.
Winter occurs when sunlight reaches the northern or the southern hemisphere directly.
-- At any given time, different parts of Earth experience different seasons.
-- At any given time, all parts of Earth experience the same season. NOT
-- Summer occurs when sunlight reaches the northern or the southern hemisphere directly.
-- Summer Occurs when sunlight reaches the northern or the southern hemisphere indirectly. NOT
-- When the southern hemisphere is tilted towards the sun, it receives more sunlight, so southern hemisphere experiences summer.
-- Winter occurs when sunlight reaches the northern or the southern hemisphere directly. NOT
In other words, December in Australia is like June in the central and south USA, Mexico, Guatemala, Nicaragua, El Salvador, Honduras, and Costa Rica.
Different parts of the earth experience different seasons, and the summers are due to the tilt of the axis that causes sunlight to reach the hemisphere.
What are seasons?Seasons are the climatic variation due to the tilted axis of the planet that results in different amounts of sunlight reaching the planet.
The region facing and tilted towards the sun experiences summers as the sun rays are direct towards that region.
As the axis is tilted towards the southern hemisphere then the region will experience the summers season, unlike the northern hemisphere.
Therefore, different parts of the earth undergo different seasons.
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The purpose of the commas in this sentence to
Answer:
Commas are used to divide or separate parts of a sentence in order to make the meaning clear and the sentence easier to read. They mark a brief pause in the sentence, usually at a point where you would naturally pause if you were speaking rather than writing.
Explanation:
can i get brainly g?
May u guys give me the definition of this words
Direct Relationship -
Dependent Variable -
Inverse Relationship -
Independent Variable -
Cyclic Change -
Dynamic Equilibrium -
Answer:
Explanation:
Direct Relationship - a mathematical relationship between two physical variables that depend upon one another such that when one variable increases the related variable also increases.
Example - For an enclosed gas it is observed that an increase in temperature (T) also results in an increase in pressure (P). Such is represented as P ∝ T which reads pressure (P) is directly related (or, proportional) to temperature (T). This does not mean that the variables temperature and pressure are equal, only that when one increases or decreases the other variable also increases or decreases proportionally.
Problems in Gas Laws relating pressure and temperature is typically referred to as The Gay-Lussac Law. Empirically it is represented by T₁/P₁ = T₂/P₂. Assume problem is given an enclosed gas at 25⁰C(= 298K*) and 750mm pressure. What is the pressure (P₂) if the temperature is increased to 35⁰C(= 308K)? and to 45⁰C(= 318K)?
*(Note: Problems in the empirical gas laws need to be worked in degrees Kelvin.)
T₁ = 25⁰C = 298K; P₁ = 750mm
T₂ = 35⁰C = 308K; P₂ = ?
T₃ = 45⁰C = 318K; P₃ = ?
T₁/P₁ = T₂/P₂ => P₂ = T₂·P₁/T₁ = 308K x 750mm / 298K = 775.17mm Pressure.
For P₃ calculation, one can work from either T₁,P₁ data or T₂,P₂ data.
This calculation chooses T₁,P₁ data.
T₁/P₁ = T₃/P₃ => P₃ = T₃·P₁/T₁ = 318K x 750mm / 298K = 800.34mm Pressure.
You apply T₂/P₂ = T₃/P₃ and you will find the same results for pressure.
Note that increasing temperature results in increasing pressure. This is 'direct relationship' analysis.
Dependent Variable & Independent Variable - The 'Dependent Variable' in a mathematical relationship 'Depends' upon an 'Independent Variable' which is chosen by the observer in order to determine the Dependent Variable. In the above problem, P is the dependent variable and T is the independent variable or, the variable the observer chooses to apply to the problem. Increases in Temperature (T) are chosen by observer to determine the Pressure (P). Increasing temperature (independent variable) results in increasing pressure (dependent variable).
Inverse Relationship - a mathematical relationship between two physical variables that depend upon one another such that when one variable increases the related variable decreases.
Example: A gas confined in a cylinder with a movable piston starting at Volume-1 (V₁) and at Pressure-1 (P₁) is changed to Volume-2 (V₂) will show a pressure value opposite to the direction of change (increased or decreased) to that of the volume change.
Problems in Gas Laws relating pressure and volume are typically referred to as Boyles Law problems. Empirically it is represented by V₁·P₁ = V₂·P₂. Assume problem is given an enclosed gas at 255ml and 750mm pressure. What is the pressure (P₂) if the volume is increased to 425ml? (Similar to pulling the plunger out of a syringe to increase volume.)
V₁ = 255ml; P₁ = 750mm
V₂ = 425ml; P₂ = ?
Using the Boyles Law relationship P₁V₁ = P₂V₂ => P₂ = P₁V₁ /V₂
P₂ = (750mm)(255ml)/(425ml) = 450mm
Note P₂ has a decreased pressure value which is opposite in direction to the change in the independent variable, volume-2 (V₂). That is, an increase in volume (V) resulted in a decrease in pressure (P).
Cyclic Change - Change that is repetitive or repeats within a noted (given) time interval. Weather change is cyclic in that fall => winter => spring => summer => fall => winter => etc.
Dynamic Equilibrium - In order to understand 'Dynamic Equilibrium' one must also define 'Static Equilibrium'. Static Equilibrium is when an object is not moving such as a marble sitting undisturbed on a level surface. All forces up, down, left & right are all equal. Dynamic Equilibrium is when an object is in motion at a constant speed on a level surface. All forces are also balanced forward, reverse, up & down. The term Dynamic Equilibrium is also applied to chemical reactions which means the rate of production of product is equal to the rate of production of reactant. This is typically represented by the equation Reactants ⇄ Products. the double arrow indicates a steady state condition of dynamic equilibrium.
Examine the chemical equation and statement.
Mg+2HCl⇌MgCl2+H2
The reaction is at equilibrium. The forward reaction is endothermic, and the reverse reaction is exothermic.
Given a decrease in temperature, how would the reaction shift?
a. A decrease in temperature will cause the reaction to shift toward the endothermic reaction, which has the reactants MgCl2 and H2.
b. A decrease in temperature will cause the reaction to shift toward the endothermic reaction, which has the reactants Mg and HCl.
c. A decrease in temperature will cause the reaction to shift toward the exothermic reaction, which has the reactants Mg and HCl.
d. A decrease in temperature will cause the reaction to shift toward the exothermic reaction, which has the reactants MgCl2 and H2.
Answer:
d
Explanation:
the endothermic reaction absorbs heat and exothermic emits heat. If we think of this from increasing the temperature, exothermic already emits heat so it would favor an endothermic reaction. In this instance, a decrease in temperature would do the opposite, which would favor the exothermic reaction.
It takes 12.35 grams of acetic acid (CH3COOH; molar mass of 60.05 g/mol) to prepare a
1.5 M solution. What is the volume in L?
Answer:
[tex]V=0.137L[/tex]
Explanation:
Hello.
In this case, since the molarity is computed in terms of the moles of solute (acetic acid) and the volume of the solution in liters, we must first compute the moles of acetic acid by using its molar mass to subsequently compute the volume as follows:
[tex]n=12.35g*\frac{1mol}{60.05g}=0.2057mol[/tex]
[tex]M=\frac{n}{V}\\ \\V=\frac{n}{V}=\frac{0.2057mol}{1.5mol/L}\\ \\V=0.137L[/tex]
Best regards.
Value: 4
The equation of a line for Data Set 4 is y = 0.14*x + -0.0398 where y is the absorbance
values and x is the concentration in mg/mL. This was created using data from known
concentrations and absorbances. Now we can use this equation of a line to determine
the concentration of an unknown solution.
Determine the concentration of an unknown solution that has an absorbance of 0.622.
Concentration =
mg/mL. Use two sig figs in your final answer
= 1/2
Next >
Answer:
x = 4.73
Explanation:
Given
y = 0.14x - 0.0398
Required
Find x when y = 0.622
To do this, we first substitute 0.622 for x.
y = 0.14x - 0.0398 gives
0.622 = 0.14x - 0.0398
Solve for 0.14x
0.14x = 0.622 + 0.0398
0.14x = 0.6618
Solve for x
x = 0.6618/0.14
x = 4.7271428571
x = 4.73 approximated
The vapor pressure of liquid octane, C8H18, is 100 mm Hg at 339 K. A sample of C8H18 is placed in a closed, evacuated 537 mL container at a temperature of 339 K. It is found that all of the C8H18 is in the vapor phase and that the pressure is 68.0 mm Hg. If the volume of the container is reduced to 338 mL at constant temperature, which of the following statements are correct?
a. No condensation will occur.
b. Some of the vapor initially present will condense.
c. The pressure in the container will be 100. mm Hg.
d. Only octane vapor will be present.
e. Liquid octane will be present.
Answer:
the final pressure (108.03 mmHg ) inside the container at 339 K is more than the vapor pressure of liquid octane (100 mmHg) at 339 K.
Hence,
b. Some of the vapor initially present will condense.
e. Liquid octane will be present.
Explanation:
Given that;
The vapor pressure of liquid octane, C8H18, is 100 mm Hg at 339 K
Initial volume of the container, V1 = 537 mL
Initial vapor pressure, P1 = 68.0 mmHg
Final volume of the container, V2 = 338 mL
Let us say that the final vapor pressure = P2
From Boyle's law,
P2V2 = P1V1
P2 * 338 = 68.0 * 537
338 P2 = 36516
P2 = 36516 / 338
P2 = 108.03 mmHg
Thus, the final pressure (108.03 mmHg ) inside the container at 339 K is more than the vapor pressure of liquid octane (100 mmHg) at 339 K.
Hence,
b. Some of the vapor initially present will condense.
e. Liquid octane will be present.
The volume of a beaker is 65.0 mL. What is the volume of
water that you need to fill up the beaker in cubic centimeters?
Answer
65cm^3
Explanation
1mL=1cm^3
so; 65.0mL=65cm^3
An example of a heterogeneous mixture is
A) soil
B) sugar
C) carbon monoxide
D) carbon dioxide
Answer: soil
Explanation:
Soil is composed of various substances in varying proportion.
An example of a heterogeneous mixture is soil as it composed of different phases while all the other 3 substances are composed of single phase.
What is a heterogeneous mixture?
Heterogeneous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogeneous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogeneous mixtures are distinctly visible . There are two types of heterogeneous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.
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A rectangular boat has a width of 5 cm, a length of 8 cm, and a mass of 150 g. How far will the boat sink into liquid with a density of 1.2 g/mL? Check your answer.
Answer:
h = 3.125 cm
Explanation:
We are given;
Width; w = 5 cm
Length; l = 8 cm
Mass; m = 150 g
Density;ρ = 1.2 g/mL
Formula for buoyant force is
Fb = ρgV = ρghA
Now, V is volume and it is given by;
V = mass/density = 150/1.2
V = 125 mL
Converting to cm³ gives; V = 125 cm³
Thus:
Since ρgV = ρghA
ρ and g will cancel out to give;. V = hA
h is the displaced liquid
A is Area = width × length = 5 × 8 = 40 cm².
Thus; 125 = 40h
h = 125/40
h = 3.125 cm
Answer:
3.75 cm
Explanation:
You can divide the boat's mass by the product of width x length.
8cm x 5cm = 40
150/40 =
3.75
How many moles are in an iron nail that has a mass of 4.58 grams?
Answer:
24.6
Explanation:
Answer:
There are 0.81 moles in an iron nail having mass of 4.58 grams..
An object will float when:
Answer:
Objects with tightly packed molecules are more dense than those where the molecules are spread out
Explanation:
Answer:
it will float when
Explanation:
there is oxygen present of when the object is not dense
Determine whether or not each chemical formula is an empirical formula. CaCO3 Choose... C6H12O6 Choose... NaMnO4 Choose... Ba3(PO4)2 Choose... K2C2O4 Choose...
Answer:
CaCO3: empirical.
C6H12O6: not empirical.
NaMnO4: empirical.
Ba3(PO4)2: empirical.
K2C2O4: not empirical.
Explanation:
Hello.
In this case, since the empirical formula of a chemical compound is the smallest whole number ratio of atoms of each element in the compound, for each compound we proceed as follows:
CaCO3: it is empirical since the subscripts there cannot be reduced anymore.
C6H12O6: not empirical since the smallest whole number ratio of atoms would be CH2O.
NaMnO4: it is empirical since the subscripts there cannot be reduced anymore.
Ba3(PO4)2: it is empirical since the subscripts there cannot be reduced anymore.
K2C2O4: not empirical since the smallest whole number ratio of atoms would be KCO2.
Best regards.
The chemical formula that are empirical and not empirical are:
[tex]CaCO_3[/tex]- empirical[tex]C_6H_{12} O_6[/tex]- not empirical[tex]NaMnO_4[/tex]- empirical[tex]Ba_3(PO_4)_2[/tex]- empirical[tex]K_2C_2O_4[/tex]- not empiricalEmpirical formulaA chemical compound's empirical formula is the smallest whole-number ratio of atoms of each element in the compound.
[tex]CaCO_3[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]C_6H_{12} O_6[/tex]: not empirical since the smallest whole number ratio of atoms would be [tex]CH_2O[/tex]
[tex]NaMnO_4[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]Ba_3(PO_4)_2[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]K_2C_2O_4[/tex]: not empirical since the smallest whole number ratio of atoms would be [tex]KCO_2[/tex]
Find more information about the empirical formula here,
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A cube of gold-colored metal with a volume of 64 cm has a mass of 980 g. The density of pure gold is 19.3 g/cm³. Is the metal pure gold?
Answer:
No, the metal is not pure gold because density is equal to mass divided by volume and in this case we end up with about 15.3, making this metal less dense than gold.
Explanation:
The definition of density allows to find the answer of whether the metal is gold:
As the density of the material is less than the gold density . This is not pure gold
Density is defined as the mass of a body divided by its volume, it is a very important physical characteristic of the body since it is invariant.
[tex]\rho = \frac{m}{V}[/tex]
Where ρ is the density, m the mass and V the volume
They indicate that the object's mass is 980 g and it has a volume of 64 cm³, ask if it is made of pure gold.
The systems of units are systems of measurements to exchange magnitude without inconveniences, the most used system is the intentional system of measurements (SI), we re-educate the magnitudes to this system
m = 980 gr ([tex]\frac{1kg}{1000g}[/tex] ) = 0.980 kg
V = 64 cm³ [tex]( \frac{1m}{100 cm} )^3[/tex] = 64 10⁻⁶ m³
let's find the density of the object
ρ = [tex]\frac{0.980 }{64 \ 10^{-6} }[/tex]
ρ = 15.3 10³ kg/m³
The tabulated gold density is 19.3 10³ kg/m³
We can see that the density for the body is less than the gold density.
In conclusion with the definition of density we can find the answer for if the metal is gold is:
As the density of the material is less than the gold density. This is not pure gold
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4. What is the dependent variable in the statement below?
If the amount of coffee that Megan drinks
before bed increases, then the amount of sleep
she gets will decrease.
A. Amount of sleep
B. Amount of coffee
C. Type of drink
D. Before bed
What is the wavelength in meters of a proton (mass = 1.673 x 10-24 g) that has been accelerated to 5% of the speed of light?
Explanation:
since it has been accelerated to 5℅ of the sleec of light then
v= 5/100 × (3× 10^8)
after getting velocity you'll substitute the values in the formula
de Broglie wavelength= h/mv
don't forget to change the grams in mass to kg
aorry I don't hav my calc with me
Carbon-11 is a radioactive isotope of carbon. Its half-life is 20 minutes. What amount of the initial mass of 70.0g of C-11 atoms in a sample will be left after 80 minutes?
a)5.68 g
b)4.38 g
c)4.20 g
d)3.96 g
e)50.00 g
Answer:
Option B. 4.38 g
Explanation:
The following data were obtained from the question:
Half life (t½) = 20 mins
Original amount (N₀) = 70 g
Time (t) = 80 mins
Amount remaining (N) =.?
Next, we shall determine the decay constant. This can be obtained as illustrated below:
Half life (t½) = 20 mins
Decay constant (K) =.?
Decay constant (K) = 0.693/ half life (t½)
K = 0.693/20
K = 0.03465 min¯¹
Finally, we shall determine the amount remaining after 80 mins as follow:
Original amount (N₀) = 70 g
Time (t) = 80 mins
Decay constant (K) = 0.03465 min¯¹
Amount remaining (N) =.?
Log (N₀/N) = kt/2.303
Log (70/N) = (0.03465 × 80)/2.303
Log (70/N) = 2.772/2.303
Log (70/N) = 1.2036
Take the anti log of 1.2036
70/N = antilog (1.2036)
70/N = 15.98
Cross multiply
70 = N × 15.98
Divide both side by 15.98
N = 70/15.98
N = 4.38 g
Therefore, the amount of the isotope remaining after 80 mins is 4.38 g
and identify the type
of reaction
Fe2O4 + Al → A1,03 + Fe
Bruh Im 4th on the leaderboard How is this possible
Answer:
I guess you just answered a lot of questions
Explanation:
Thanks for the points btw :)
Answer:
Congatulations I am never gonna make it up there OMEGALUL
Explanation:
All cells must have energy to function. Most of the energy used by the cells in your body is produced by cellular respiration. In cellular respiration, cells use ____________ to release energy stored in __________.
Answer:
In cellular respiration, cells use oxygen to release energy stored in glucose.
If my answer helped, please mark me as the brainliest!!
Thank You!!
Answer:oxygen and sugars
Explanation:
What is science? what is science?
We define science as the knowledge that seeks to understand truths or natural laws to explain .
What science concept?In the most specific sense of the word, science is that type of knowledge that seeks to understand truths or natural laws to explain the functioning of things and the universe in general.
The concept of science can be defined as a body of systematized knowledge acquired through observation, identification, research and explanation of certain categories of phenomena and facts, and formulated methodically and rationally.
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Answer:
Science is the acquisition of our own knowledge through experimentation to explain and describe natural phenomena.
Explanation:
Science comes from the Latin word, Scientia, which means knowledge. Knowledge are facts that can be verified.
Convert 38 kilometers to meters
Answer: 38 km = 38000 meters
Explanation:
1 km = 1000 meters
38 km= 38000 meters
The electron configuration for P is ___.
Answer:
The Electron Configuration for Phosphorus is = 1s^2 2s^2 2p^6 3s^2 3p^3
Explanation:
Here is a sheet of paper that might help you out. You follow the red lines and where it has 3p^6 is if it is a full set. If you count the number that all of those are raised to, then you should get 15 (which is the atomic number).
Sorry, if it is horizontal instead of vertical.
ild a model of ethane, CH_3CH_3CH 3 CH 3 . Looking at one of the carbon atoms, what geometry is present?
Answer:
Each carbon atom is tetrahedral
Explanation:
If we consider a model of ethane, we will quickly discover that all carbon atoms are bonded to four other atoms. This means that there are four regions of electron density around each carbon atom.
According to the valence shell electron pair repulsion theory, when a central atom has four regions of electron density on its outermost shell, the molecule must have a tetrahedral geometry.
Which weighs more, 5.25 g of gold or 525 mg of gold?
A. 5.25 g
B. 525 mg
Answer:
A) is best answer and would be 5250mg
Explanation:
Which part of the experiment is not touched by the independent variable or is the normal/comparison
How does the warm water at the bottom of a pot travel up
Answer: Because heat rises and it also makes the water bubble up which creates more height.
Explanation:
Answer Liquid on the bottom of the pot closest to the heat source starts to get hot; as that happens, it rises. The rising hot water is replaced by the cooler, more dense water molecules.
Explanation: