Science
How is the total magnification of a
cell calculated?
how do you start a hypothesis in science which includes scientific words and information which is on how much sugar can dissolve in water using the temperature of the solvent which is the water?
Answer: If ... Then... Because...
Explanation: if I water this plant twice a day then it will grow 3 feet because the more water it gets the bigger it grows
what determines the identity of a substance?
proton
neutron
electron
photon
Answer:Typically, the identity of a substance can be described by a: chemical name, for example, benzene; number, for example, EC number 200-753-7, and.
Explanation:chemical composition, for example, >99 % benzene and <1 % toluene. The composition is determined by chemical analysis.
Answer:
proton
Explanation:
thats what my bio teacher just said
2CO +0, 200, what is the mole ratio of carbon monoxide to carbon
dioxide
A 1.2
B 2.2
C 2:1
D 3:1
Answer:
B. 2.2
Explanation:
how could you get the crystals in a supersaturated solution back into the solution?
A student was asked to determine the activity of four unknown metals W,X,Y and, Z.
Answer:
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
The activity of four unknown metals based on their chemical changes is option B.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Question 6
6.7 pts
A solution has a very high electrical conductivity, turns litmus paper red and has a pH of 2.0. This is most likely
a(n)
Base/Strong Electrolyte
Acid/Weak Electrolyte
Acid/Strong Electrolyte
Base/Weak Electrolyte
Next
« Previous
Answer:
Acid/String Electrolyte
Explanation:
Litmus paper turning red means it is an acidic solution. A pH of more than 7 is Base while pH of less than 7 is an acid. Since the pH is 2, less than 7, it s is an acid. Since it has a high electrical conductivity, it must be a strong Electrolyte.
Which refers to solid ice that condenses and forms on surfaces like grass or windows?
dew
frost
hail
sleet
Frost refers to solid ice that condenses and forms on surfaces like grass or windows.
WHAT IS FROST?Frost refers to a deposit of small white ice crystals formed on solid surfaces when the temperature falls below freezing temperature.
Frost forms when the temperature of the atmosphere is below freezing i.e. < 0°C.
Therefore, frost refers to solid ice that condenses and forms on surfaces like grass or windows.
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3. Svante Arrhenius developed a definition of acids and bases
which stated...
A. acids produce OH+ ions and bases produce H ions
B. acids produce H+ ions and bases produce OH ions
STAT
C. acids and bases are the same
D. acids have a high pH and bases have a low pH
pls help
btw any links will be reported.
How many grams of CO2 are produced from 6.7 L of O2 gas at STP?
13 g CO₂
General Formulas and Concepts:Chemistry
Atomic Structure
Reading a Periodic TableMolesSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisMath
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right Explanation:Step 1: Define
Identify variables
[Given] 6.7 L O₂
[Solve] g O₂
Step 2: Identify Conversions
[STP] 22.4 L = 1 mol
[PT] Molar Mass of O: 16.00 g/mol
[PT] Molar Mass of C: 12.01 g/mol
Molar Mass of CO₂: 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 6.7 \ L \ O_2(\frac{1 \ mol \ O_2}{22.4 \ L \ O_2})(\frac{44.01 \ g \ O_2}{1 \ mol \ O_2})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 13.1637 \ g \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
13.1637 g CO₂ ≈ 13 g CO₂
Which of the following will conduct electricity?
Question 9 options:
A) Acid solutions only
B) Base solutions only
C) Acid solutions and base solutions
D) Neither acid solutions nor base solutions
Answer:
I think is c
Explanation:
I hope this helps you
Answer:
Acid solutions and base solutions
Explanation:
What does the group number of an element tell you about the electrons?
Answer:
Explanation:
The group number of an element tells about the total number of electrons present in the valence shell or orbit of an atom.
The ionization energies required to remove successive electrons from one mole of calcium atoms are 590 kJ/mol, 1145 kJ/mol, 4912 kJ/mol, and 6474 kJ/mol. The most common ion of calcium is probably
Answer:
Ca^2+
Explanation:
As we know, more energy is required to remove an electron from a positively charged ion than is required to remove an electron from a neutral atom. Hence, the second ionization energy of calcium is greater than its first ionization energy.
However, the third and fourth ionization energies of calcium are much higher than the second ionization energy because they involve removal of electrons from an inner filed shell. This process requires a lot of energy and is often not feasible.
Hence, the most common ion of calcium must be Ca^2+ where only two electrons are removed from calcium.
Which organism in a food web would be best described as a recycler?
O A.
Cottontail rabbit
B.
Termite
C.
Fungi and bacteria
D.
Red fox
C,
takes dead things, makes them into other things
Imagine you had HCl with a concentration of exactly 0.10 mol/dm3. If 0.023 dm3 of a sodium hydroxide solution, NaOH (aq), could exactly neutralize 0.040 dm3 of the HCl solution, what is the concentration of the NaOH (aq)
Answer:
Explanation:
Step 1: Calculate the amount of sodium hydroxide in moles
Volume of sodium hydroxide solution = 25.0 ÷ 1,000 = 0.0250 dm3
Rearrange:
Concentration in mol/dm3 =
Amount of solutein mol = concentration in mol/dm3 × volume in dm3
Amount of sodium hydroxide = 0.100 × 0.0250
= 0.00250 mol
Step 2: Find the amount of hydrochloric acid in moles
The balanced equation is: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
So the mole ratio NaOH:HCl is 1:1
Therefore 0.00250 mol of NaOH reacts with 0.00250 mol of HCl
Step 3: Calculate the concentration of hydrochloric acid in mol/dm3
Volume of hydrochloric acid = 20.00 ÷ 1000 = 0.0200 dm3
Concentration in mol/dm3 =
Concentration in mol/dm3 =
= 0.125 mol/dm3
Step 4: Calculate the concentration of hydrochloric acid in g/dm3
Relative formula mass of HCl = 1 + 35.5 = 36.5
Mass = relative formula mass × amount
Mass of HCl = 36.5 × 0.125
= 4.56 g
So concentration = 4.56 g/dm3
what are the best topics to write a project work on EVS and Chemistry
Answer:
It is better to do chemistry
Explanation:
So that you will learn more of chemicals
Plz answer fast , (it’s a picture
Answer:
Explanation:
1.4193.61
2.1.69205e7
3.1.57611e14
4.46270.5
What kind of reaction shows two reactants combining to form one new product?
What kind of reaction shows two reactants combining to form one new product?
A) a single-replacement reaction
B) a double-replacement reaction
C) a decomposition reaction
D) a synthesis reaction
how does gas create pressure?
a. the force of a collision between two gas molecules with the same amount of kinetic energy creates pressure
b. the force of a collision of a gas molecule against the walls of its container create pressure
c. the force of a collision between two gas molecules with different temperatures creates pressure
d. the force of a collision of a gas molecule against the air in a container creates pressure
In your OWN words, what is the difference between a solute, solvent and solution?
Answer:
could u all help me??
Who was Agamemnon trying to persuade to come fight with him again?
Patroclus
Achilles
Odysseus
Hector
Explanation:
define restivity and conductivity?
Answer:
Electrical resistivity is a property of a material that tells you how much it resists the flow of electric current, while conductivity quantifies how easily current flows.
At what temperature will 2.50 moles of ideal
gas produce a pressure of 25.0 atm in a 10.0 L
container
Answer: 1,218K
Explanation:
The carbon dioxide is released when limestone is heated during the
production of _____?
Carbon dioxide is released when limestone is heated during the production of [tex]\sf\purple{cement}[/tex]. ✔
[tex]\circ \: \: { \underline{ \boxed{ \sf{ \color{green}{Happy\:learning.}}}}}∘[/tex]
Calculate the mass of an object that has a density of 3.52g/cm^3 and
a volume of 5000 cm^3. Note that Mass = Volume X Density
Answer:
17.6kg
Explanation:
mass = Volume × Density
mass = 5000cm^3 × 3.52g/cm^3
mass = 17600g = 17.6kg
match these items. three-dimensional bonding, hardest natural substance, used as lubricant, nonconductor, weak planar bonds, carbon black or soot
Answer:
1. three-dimensional bonding
Diamond
2. Hardest natural substance
diamond
3. Used as lubricant
Graphite
4. nonconductor
Diamond
5. Weak, planar bonds
Graphite
6.Carbon black or soot
Amorphous
Explanation;
sorry im late, hopefully this can help somebody :)
explain how soil can affect the composition of the solution that move through it
Answer: Soils are formed through the interaction of five major factors: time, climate, parent material, topography and relief, and organisms.
Soil structure affects plant growth in many, often surprising, ways. The most obvious effects are on root growth, which is strongly inhibited by hard soil, and which in turn influences the ability of the root system to extract adequate water and nutrients from the soil.
Explanation:
https://www.publish.csiro.au/sr/pdf/SR9910717
This is where I gather some info.
3. A PS6 plugged into a 120 V outlet uses 3 Amps. What is the Resistance rating of
the power cord?
voltage: V=
current: 1 =
resistance: R=
V=IxR
1=VR R
Underline/Bold Which Equation we are going to use:
= V
Plug in the numbers from above and solve for our answer:
Answer:
R = 40 ohms
Explanation:
Given that,
The voltage of outlet, V = 120 V
Current flowing through the device, I = 3 A
We need to find the Resistance rating of the power cord. Let the resistance is R. We know that,
Ohm's law, V = IR
Put all the values,
[tex]R=\dfrac{V}{I}\\\\R=\dfrac{120}{3}\\\\R=40\ \Omega[/tex]
So, the resistance rating of the power cord is equal to 40 ohms.
A sodium nitrate solution was prepared in the lab to have a concentration of 0.467 M. If 50. mL of a 6.00 M stock solution was used to prepare this sodium nitrate solution, what volume of water was added to the original 50. mL of stock solution? Provide the appropriate units (mL or L) to your response.
the treaty of versailles ended world war i, but some of the terms of the treaty contributed to the beginning of world war ii. which was one of the terms of the treaty? the answer would be "germany was forces to pay reparations to the allied countries.". i hope this .
Explanation:
A gas occupies 4.21 Iiters at a pressure 1 074 atm. What will its volume be if the pressure is decreased to 0.46 atm?
Answer:
15.9 Liters
Explanation:
according to Boyle's law P1V1 = P2V2
so we just plug in the values the problem gives us and solve for V2
(1.74)(4.21)=(.46)(V2)
V2 = 15.9 Liters
*note - there is a typo in your question when you states P1 = 1 074 atm. I just assumed you meant 1.74, if this is a mistake just replace 1.74 with the real P1 and solve it as shown above
if you have any questions just comment them below
1. If CO2 is being produced in the solution at a faster rate than H2CO3, is the rate of the forward or reverse reaction faster?
Answer:
I believe that it would be faster but the reaction would not happen immediately. It would take a long time for the effect to start kicking in but it will definitely speed up the process of CO2 being released into our atmosphere.
Explanation:
If CO₂ is being produced in the solution at a faster rate than H₂CO₃, then the rate of the forward reaction is faster.
What is the rate of a reaction?Rate of any reaction tells about the duration of the completion of reaction to produce products.
Given chemical reaction is written as:
H₂CO₃ ⇄ CO₂ + H₂O
In the question it is given that CO₂ is produced at the faster rate, and it is the product of the forward reaction. So, we conclude that rate of forward reaction is faster.
Hence, the rate of forward reaction is faster.
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