Answer:
The molecular formula lists the symbol of each element within the compound followed by a number (usually in subscript). The letter and number indicate how many of each type of element are in the compound. If there is only one atom of a particular element, then no number is written after the element.
It’s cold outside and you decide to cook some pasta. As you boil the noodles, the kitchen window begins to fog up. Which processes are at work here?
boiling and freezing
vaporization and condensation
evaporation and thawing
condensation and evaporation
Answer:
condensation and evaporation
Explanation:
condensation forms when warm humid air contacts cold surface. during cold months.
Iron + --> iron sulphate + copper What is missing ? Iron sulphate Copper sulphate Copper oxideIron oxide
Answer:
Copper Sulphate is missing
what is the name of the part of a cell that allows molecules in in, such as glucose and oxygen?
Answer:
A plasma membrane is permeable to specific molecules that a cell needs. Transport proteins in the cell membrane allow for selective passage of specific molecules from the external environment. Each transport protein is specific to a certian molecule (indicated by matching colors).
3 – Simple Diffusion Across the Cell (Plasma) Membrane: The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.
Or Cell Membrane
Explanation:
Hope This HElp??
Please MArk Me Brainly!!
Which of the following best support the claim that the cycling of matter and energy in Earth's interior affects
Earth's surface? Select all correct answers!!!!
A)Tectonic plates move together, apart, and past each other.
B)Lava can be observed rising to Earth's surface in some places.
C)The Earth's crust is much cooler than the Earth's interior.
D)The Earth's inner core is composed mostly of solid iron.
Answer:
am not sure but I think it c
Answer:
it’s A and B and the last one I still am trying to figure out.
Explanation:
What element should I do a project on?
Answer:
Project scope statement?
Explanation:
it's good one just do research on it
What is a catalyst and why is it used in chemical reactions?
Answer:
A catalyst is a substance that can be added to a reaction to speed up the process without being absorbed by it. Catalysts usually work by lowering the activation energy or modifying the mechanism of a reaction. Proteins that act as catalysts in biochemical reactions are known as enzymes.
Explanation:
Molarity and Dilution
How many moles are needed in a 100. mL solution of a 0.10M CuSO4 5H2O solution?
Answer: The moles needed are 0.01.
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute [tex](CuSO_4.5H_2O)[/tex] = ?
[tex]V_s[/tex] = volume of solution in ml
Now put all the given values in the formula of molarity, we get
[tex]0.10=\frac{n\times 1000}{100}[/tex]
[tex]n=\frac{0.10\times 100}{1000}=0.01[/tex]
Therefore, the moles needed are 0.01.
Write the net ionic equation of HNO3+Fe--> Fe(HNO3)2 +H2
Answer:
nitric acid + iron=iron+[nitric acid ] 2 hydrogen
The net ionic equation will be Fe → [tex]Fe^{2+}[/tex].
What is net ionic equation?The net ionic equation would be a chemical equation which only indicates the elements, compounds, as well as ions instantly involved in a chemical reaction.
The given chemical equation is:
HNO3+Fe → Fe(HNO3)2 +H2
It can be written in term of ionic equation.
[tex]H^{+}[/tex] + [tex]NO_{3}^{-}[/tex]+Fe → [tex]Fe^{2+}[/tex] + [tex]H^{+}[/tex] + [tex]NO_{3}^{-}[/tex]
Hydrogen ion and nitrate ion will be canceled each other.
Hence, the net ionic equation will be
Fe → [tex]Fe^{2+}[/tex]
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What is the symbol for entropy? S ΔH H ΔS
Answer:
S
Explanation:
The symbol for entropy is S, and a change in entropy is shown as “delta” S or ΔS. If the entropy of a system increases, ΔS is positive. If the entropy of a system decreases, ΔS is negative.
Sodium chloride is a ____ substance because the atoms within are arranged in repeating patterns.
work bank
- crystalline
- hydrogen bonds
- hydrophilic
- hydrophobic
- polar molecule
- solvent
will mark BRAINLYIST
please help
1.00mol is the correct answer
2.00 L of a gas is collected at 25.0°C and 745.0 mmHg. What is the volume at 760.0 mmHg
and 273K?*
1.7960L
Explanation:
the mass of the gas is constant in both instances
pv/T=constant(according to pv=nRT)
745mmHg*2L/298K=760mmHg*v/273K
v=1.7960L
SHOW ALL WORK AND INCLUDE UNITS
How much heat is required to raise the temperature of 10.0 g of iron from 25°C to 100.°C? The specific heat capacity of iron is 0.46 J/g°C.
Answer:
345J
Explanation:
-mass of iron (m) = 10.0 g
-temperature (ΔT) = final temperature- initial temperature= 100-25= 75 degree Celsius
-Specific Heat capacity of iron (c)= 0.46J/g°C.
Heat (Q)=?
Solution:
Formula for Heat is :
Q=m x c x ΔT
Q= 10 x 0.46 x 75
Q= 345 J.
so, 345 joules of heat are needed to increase the temperature of 10 grams of iron.
From the above formula, all other questions can easily be solved from the same procedure.
345 joules of heat is required to raise the temperature of 10.0 g of iron from 25°C to 100°C.
How we calculate the required heat in any reaction?Required heat of any reaction can be calculated as:
Q = m x c x ΔT, where
In the question given that:
m = mass of iron = 10g
c = specific heat capacity of iron = 0.46J/g°C
ΔT = change in temperature = final temperature- initial temperature= 100-25= 75 degree Celsius
Now putting all these values in the above equation, we get
Q= 10g x 0.46J/g°C x 75°C = 345J
Hence, 345 joules of heat is required.
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A gas tank contains 2.5 moles of oxygen, 7.0 moles of nitrogen and 0.5 mole of water vapor. The total pressure of the mixture is 852 torr. Calculate the partial pressure of each gas. Show work.
Answer:
The partial pressure of each gas is:
Oxygen= 213 torrNitrogen= 596.4 torrWater Vapor= 42.6 torrExplanation:
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
PT = PA + PB
This relationship is due to the assumption that there are no attractive forces between the gases.
Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.
The mole fraction of a gas in a gas mixture is given by:
XA = nA / nT
This fraction will always be less than 1.
So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:
PA = XA * PT
In this case, you know:
number of moles of oxygen= 2.5 molesnumber of moles of nitrogen= 7.0 molesnumber of moles of water vapor= 0.5 molesSo, the number of total moles nT is calculated as:
nT= number of moles of oxygen + number of moles of nitrogen +number of moles of water vapor
Then:
nT= 2.5 moles + 7.0 moles + 0.5 moles
nT= 10
So, the mole fraction of the gas in the mixture is:
mole fraction of oxygen = [tex]\frac{2.5 moles}{10 moles}[/tex] = 0.25mole fraction of nitrogen = [tex]\frac{7 moles}{10 moles}[/tex] = 0.7mole fraction of water vapor = [tex]\frac{0.5 moles}{10 moles}[/tex] = 0.05Being the total presurre (PT) equal to 852 torr, then:
Poxygen= 0.25*852 torr= 213 torrPnitrogen= 0.7*852 torr= 596.4 torrPwater vapor= 0.05*852 torr= 42.6 torrThe partial pressure of each gas is:
Oxygen= 213 torrNitrogen= 596.4 torrWater Vapor= 42.6 torrPLEASE WILL MARK BRAINLYIST
Answer:
3 i am pretty sure make me brainy i gust
Explanation:
Mikala pours a tablespoon of salt into a beaker of water. Diffusion will cause the salt molecules to dissolve in the molecules of water. How could Mikala increase the diffusion rate of the salt molecules?
A. Mikala could remove all sources of light from the beaker.
B. Mikala could slowly pour more water into the beaker.
C. Mikala could decrease the temperature of the solution.
D. Mikala could increase the temperature of the solution.
someone help ,, I'll give brainliest lolll .
Answer:
the correct answer is c, how easily something catches flames
What is the identity of the element that has 19 protons and 22 neutrons?
Answer:
A titanium ion
5. What kind of model is represented in the image below?"
A. mathematical
B. physical
C. virtual
Answer:
virtual
Explanation:
because we cannot touch or sense it
why is it necessary to specify temperature when giving Ka value
Answer:
Because the equilibrium constant is only at constant at temperature. Changing the temperature changes the Ka.
Acidified water is electrolysed by using carbon electrodes. What is produced
at Negative carbon electrode
Answer:
Hydrogen gas
Explanation:
During electrolysis of acidified water, H+ ions are reduced to H2 gas at the negative carbon electrode (cathode) and hence hydrogen gas is liberated at cathode.
Earthquakes are common at ocean-continent convergence zones but not ocean-ocean convergence zones. TRUE FALSE Check it
Answer:
FALSE
Explanation:
The earthquakes are common in both types of convergences is oceanic and continental and ocean to oceanic convergence. As the process of subduction takes places at the oceanic - oceanic boundary and resultant plate slide down other plate leading to recycling of the crust, volcanic eruptions and this leads to the formation of a volcanic arc, trenches, and faults.Which of the following describes an exothermic reaction?
An exothermic reaction is described by ΔH(reactants) is greater than ΔH( products) and the correct option is option A.
What is Exothermic reaction?The word exothermic means “releasing heat.” Energy, often in the form of heat, is released as an exothermic reaction proceeds.
Enthalpy of a reaction is defined as the heat energy change (Δ H) that takes place when reactants go to products. If heat is absorbed during the reaction, Δ H is positive; if heat is released, then Δ H is negative.
ΔH value negative –> energy released –> exothermic reaction
ΔH value positive –> energy absorbed –> endothermic reaction
Therefore, an exothermic reaction is described by ΔH(reactants) is greater than ΔH( products) and the correct option is option A.
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A scientist made the following table showing the number of eggs laid by two different salmon. Based on this data, which fish has the best chance of their offspring surviving, and what type of adaptation is this?
A) Salmon #1, life cycle adaptation
B) Salmon #1, physical adaptation
C) Salmon #2, life cycle adaptation
D) Salmon #2, behavioral adaptation
Answer:
C
Explanation:I got it correct on a quiz I did that had this question
The orbits of the planets in our solar system are
not
a Elliptical, circular
b Circular, elliptical
C Circular, oval
d None of the above
Answer:
A
Explanation:
I don't know how to say how I got it.
Answer:
d
Explanation:
the orbits of the planets in our circular elliptical and circular
PLEASE HELP ME EASY
List three household products that should go to a secure landfill site instead of regular sanitary landfill.
Answer:
plastic, glass, and electronics
Explanation:
those take longer to erode than normal trash.
What medium do selsmic waves travel through?
A
The alr
B
The ground
C
Water
D
Outer space
Calculate the pH after 0.10 mol of NaOH is added to 1.0 L of a solution that is 0.40 M CH3NH2 and 0.80 M CH3NH3Cl. WebAssign will check your answer for the correct number of significant figures. Calculate the pH after 0.10 mol of HCl is added to 1.0 L of a solution that is 0.40 M CH3NH2 and 0.80 M CH3NH3Cl. WebAssign will check your answer for the correct number of significant figures.
Answer:
E
Explanation:
What would be the volume, in liters, of 85.5 grams of carbon monoxide at STP?
Variables – this experiment tests how the temperature of water affects the time it takes for antacid tablets to dissolve. (they drop an antacid in hot water and one in cold water)
• What is the independent variable? (2 points)
• What is the dependent variable? (2 points)
Explanation:
You can think of independent and dependent variables in terms of cause and effect: an independent variable is the variable you think is the cause, while a dependent variable is the effect. In an experiment, you manipulate the independent variable and measure the outcome in the dependent variable.