Answer:
Chemical changes due to heat and pressure
Explanation:
Just took the test, hope this helps! :)
Answer:
Chemical changes due to heat and pressure
Explanation:
I took this test and got a 100%! :D
What does the pH of a solution represent?
A. The pH represents the partial pressure of hydrogen gas.
B. The pH tells how quickly a reaction reaches equilibrium.
C. The pH indicates how acidic or basic a solution is.
D. The pH is an indicator of the salt content of a solution.
Answer:
The pH indicates how acidic or basic a solution is.
Explanation:
i just took the test and got it right.
pH of a solution is the measure of how acidic or basic the solution is. It is determined based on the H+ ion concentration in the solution. Hence, option C is correct.
What is pH?pH of a solution is the measure of the H+ ion concentration in a solution. It determines the acidity or basicity of the solution. Mathematically it is the negative logarithm of H+ ions concentration.
pH = - log [H+]
A pH scale can be used to determine the acidity or basicity of a solution. If the basicity is 7, then the solution is neutral. If the pH is less than 7 then the solution is acidic and a pH above 7 is basic solution.
Red- green color in pH scale represent the acidic solution where green is neutral and cyan to dark blue color is given by bases. Using a litmus paper the acidity can be checked based on these color change.
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Radio waves are used to transmit information on various channels. What is the wavelength of a radio wave having the frequency of 5.40 × 1010 Hz?
1. Analyze the Problem
ν = and c = Unknown: λ =
You know that because radio waves are part of the electromagnetic spectrum, their speed, frequency, and wavelength are related by the formula c = λν.
Answer:
5.56×10¯³ m
Explanation:
From the question given above, the following data were obtained:
Frequency (v) = 5.4×10¹⁰ Hz
Wavelength (λ) =?
The velocity of electromagnetic wave, frequency and wavelength are related according to the equation:
Velocity (c) = wavelength (λ) × frequency (v)
c = λv
With the above formula, the wavelength of the radio wave can be obtained as follow:
Frequency (v) = 5.4×10¹⁰ Hz
Wavelength (λ) =?
Velocity (c) = 3×10⁸ m/s
c = λv
3×10⁸ = λ × 5.4×10¹⁰
Divide both side by 5.4×10¹⁰
λ = 3×10⁸ / 5.4×10¹⁰
λ = 5.56×10¯³ m
Thus, wavelength of the radio wave is 5.56×10¯³ m
what is the correct answer !
Answer:
Hi there, The correct answer is, OPT A
Explanation:
Please mark as the brainliest
6. A father rabbit had long ears while the mother rabbit had short ears. Which of these statements
explains why one of the baby bunnies could have long ears?
a
The baby bunny inherited its copies of the gene for ear length from its father and not from
its mother. Those genes connect together to make its ears long.
b
The baby bunny inherited its copies of the gene for ear length from its father and not from
its mother. Just like its father's genes, those genes instruct for proteins that connect in
ways that make its ears long.
С
The baby bunny inherited one copy of the gene for ear length from its father and one copy
from its mother. That gene combination instructs for proteins that connect in ways that
make long ears.
d
The baby bunny inherited one copy of the gene for ear length from its father and one copy
from its mother. Those genes connect together to make its long ears.
Answer:
D if I’m correct
Explanation:
Please help with this
Ionic bonds form between _____ which form positively charged ions and _____ which form negatively charged ions.
ionic bonds form between metals which form positively charged ions and nonmetals which form negatively charged ions.
LOOK AT THE PICTURE!! i’ll mark as brainliest!!
Answer:
c
Explanation:
Determine the number of valence electrons for each of the following:
O
Cs
Ca
Se2-
Na+
C
N
Al
He
Complete the following sentence: In a reaction containing two reactants, if one of the reactants is in excess, the other reactant is known as the ______ reactant.
Answer:
excess reactant
Explanation:
The excess reactant is the reactant in a chemical reaction with a greater amount than necessary to react completely with the limiting reactant. It is the reactant(s) that remain after a chemical reaction has reached equilibrium.
In a reaction containing two reactants, if one of the reactants is in excess, the other reactant is known as the limiting reactant which decides the yield of the reaction.
What is limiting reactant ?In a reaction, all the reactants have to be in correct stoichiometry to complete the reaction. To achieve the mole ratio of the reactants is very much important for the completion of a reaction.
If a reactant is insufficient in amount, then the reaction will stop as soon as this reactant is consumed. Hence, this reactant determine the yield of the product. This reactant which is not in correct stoichiometry for the complete reaction is called the limiting reactant.
The reactant which is excess in quantity thus does not have a role in the yield of the reaction is called the excess reactant. Whatever, the concentration of this reactant in extra, the reaction does not proceed after the consumption of limiting reactant.
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Describe two differences between transition elements and alkali metals?
Explanation:
On the periodic table, we can find a wide range of elements from alkali metals, to the alkali earth metals, transition metals and through to the noble gases.
The alkali metals are found on the first group in the periodic table and they are group of metals. Also, the transition elements are also a group of metals.
Transition elements are known to have variable oxidation states whereas, alkali metals have an oxidation state of +1. Transition metals belong the d-block on the periodic table whereas alkali metals are found in the first group on the periodic table.how is energy transfered from one piece of metal to another
Answer:
The positive and negative electrons attract leaving a shock and heat travels faster through metal than any other material such as plastic, wood, etc.
Explanation:
Answer:
The electrons in a piece of metal can leave their atoms and move about in the metal as free electrons. ... The hotter the metal, the more kinetic energy these vibrations have. This kinetic energy is transferred from hot parts of the metal to cooler parts by the free electrons.
Explanation:
Which technique helps you become more resoureful
Answer:
There is an abundance of technology to help students become more resourceful and productive. For example, mind mapping can help kids better understand problems and devise plans by visualizing connections, outlining different sides of issues, and determining next steps.
Explanation:
_____ are bits and pieces of material that end up in a body of water.
Answer:
sediments
Explanation:
Which three elements are combined in lithium sulfate ?
Answer:
jsidndnxjxixdjdbsjsjdidnsjdjdidndjd
A 5.0 g sample of metal was heated to a temperature of 100.0 °C then placed into a calorimeter containing 35 mL of water at 20.0°C.
The final temperature was 26.5°C What is the specific heat capacity of the metal?
The specific heat capacity of the metal : c = 2.59 J/g °C
Further explanationGiven
5 g sample
35 ml water = 35 g
Required
The specific heat capacity of the metal
Solution
Heat can be formulated :
Q = m.c.Δt
Q in = Q out
Q absorbed = Q released
Q water = Q metal
35 g x 4.184 J/g °C x (26.5-20)= 5 x c x (100-26.5)
951.86 J = 367.5 x c
c = 2.59 J/g °C
Please help me!!! 12 points :)
How to calculate the number of molecules in 18g of H2O
We, know molecular mass of water is, M = 16 g/mol .
Given mass of water, m = 18 g.
We know, number of moles is given by :
[tex]n = \dfrac{18\ g}{16 \ g/mol}\\\\n = 1.125\ moles[/tex]
Now, 1 mole of any compound contains 6.022 × 10²³ molecules.
So, number of moles in 1.125 moles of water is 1.125 × 6.022 × 10²³ =
6.77 × 10²³ molecules.
Hence, this is the required solution.
5. Solve the following crossword puzzle.
a. Maximum energy generation in India is done using ........ energy.
b. energy is a renewablesource of
energy.
c.Solar energy can be called.... energy.
e. ......... energy of water in dams is used for generation of electricity.
Answer:
I think it is b
Explanation:
Which equation is NOT balanced?
A. 2H2 + O2® 2H2O
B. H2 + H2 + O2® H2O + H2O
C. 2H2 + O2® H2O
D. 4H2 + 2O2® 4H2O
Answer:
C
Explanation
On the reactants side there is 4 Hydrogen atoms in total and two oxygen atoms on the left however on the right there is two hydrogen atoms and one oxygen atom. Leaving this equation unbalanced
The equation that is NOT balanced is [tex]\rm 2H_2 + O_2\rightarrow H_2O[/tex]. The correct answer is option C.
In a balanced chemical equation, the number of atoms of each element on the reactant side must be equal to the number of atoms of each element on the product side.
In equation A, there are 4 hydrogen atoms and 2 oxygen atoms on both the reactant and product sides, so it is balanced.In equation B, there are 4 hydrogen atoms and 2 oxygen atoms on both the reactant and product sides, so it is balanced.In equation C, there are 4 hydrogen atoms and 2 oxygen atoms on the reactant side, but only 2 hydrogen atoms and 1 oxygen atoms on the product side. Therefore, it is not balanced.In equation D, there are 8 hydrogen atoms and 4 oxygen atoms on both the reactant and product sides, so it is balanced.In conclusion, equation C. [tex]\rm 2H_2 + O_2\rightarrow H_2O[/tex] is the one that is NOT balanced. It has an unequal number of oxygen atoms on the reactant and product sides.
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what’s the correct answer !!
Answer:
From my side the correct option is "A"
Explanation: Reasons for its correction are ,
1) Highly reactive: Nanoparticles are therefore extremely unstable and easily change themselves or react with active substances to reach a relatively stable state in some cases. This causes desired changes or undesired changes to nanoparticles and thus makes them exhibit a high reactivity and a poor stability.
2)Small size: Nanotechnology can provide rapid and sensitive detection of cancer-related molecules, enabling scientists to detect molecular changes even when they occur only in a small percentage of cells. Nanotechnology also has the potential to generate entirely novel and highly effective therapeutic agents.
Charles's law describes the relationship of the volume and temperature of
gas at a constant mass and pressure. According to this law, what would
happen to the volume of the gas if its temperature increased from 150 K to
300 K?
A. The volume would increase from 150 mL to 300 mL.
B. The volume would be reduced by half.
C. The volume would decrease by 150 mL.
D. The volume would double.
Answer:
Charles's law is: When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion. So the volume would increase
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Q26. Aqueous sodium oxalate (C204)2- and aqueous lead (II) nitrate react to product solid
lead (II) oxalate and aqueous sodium nitrate.
3.
I need Balanced chemical equations
Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + 2NaNO₃(aq)
Further explanationGiven
Word equation
Required
Balanced equation
Solution
Convert to skeleton equation
Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + NaNO₃(aq)
Balanced equation
Give a coefficient
Na₂C₂O₄(aq) + aPb(NO₃)₂⇒bPbC₂O₄(s) + cNaNO₃(aq)
Make an equation
C, left = 2, right =2b⇒2b=2⇒b=1
Na, left = 2, right = c⇒c=2
O, left = 4+6a, right = 4b+3c⇒4+6a=4b+3c⇒4+6a=4.1+3.2⇒6a=6⇒a=1
The equation becomes :
Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + 2NaNO₃(aq)
A student increases the temperature of a 673 cm^3 balloon from 275 K to 460 K.
Assuming constant pressure, what should the new volume of the balloon be?
Round your answer to one decimal place.
Answer:
1125.75 cm³
Explanation:
We are given;
Initial volume; V1 = 673 cm³
Initial temperature; T1 = 275 K
Final temperature; T2 = 460 K
From Charles law, we can find the new volume from;
V1/T1 = V2/T2
V2 = (V1 × T2)/T1
V2 = (673 × 460)/275
V2 = 1125.75 cm³
Atmosphere
B
Ocean
Land
с
Which arrow or arrows represents a change of state from a liquid to a gas caused by the
sun's energy?
A. arrow A
B. arrow B
C. arrow A and arrow B
D. arrow B and arrow C
How many moles of H₂O can be produced when 5.5 moles of CO₂ is produced? C₂H₄ + 3 O₂ --> 2 CO₂ + 2 H₂O
Answer:
5.5 mol H2O
Explanation:
Given over what you need and then mole ratio of coefficients in the balanced equation then cross multiply and do PEMDAS for that, and then you got your answer :) hope this helped.
Need help balancing equations please.
Answer:
A, 4,3,2
B, 1,1,2
C, 1,1,1,2
Which job title describes a person with a career in green energy?
Answer:
Natural resource professional
Explanation:
The job title that describes a person with a career in green energy is a hydroelectric technician. The correct option is c.
What is green energy?Green energy is renewable energy and these energies are produced by renewable resources. Renewable resources are the resources that will not be reduced, and these natural resources are present, and these energies can reproduce again by these resources.
The hydroelectric technician is the person who checks the technical problems of a hydroelectric power plant. Hydroelectricity is produced by water.
This is a renewable resource, and it does not produce any kind of pollution, So a hydroelectric technician will be a job title that describes a person with a career in green energy.
Therefore, the correct option is c., hydroelectric technician.
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The question is incomplete. Your most probably complete question is given below:
Elevator installer
sewing machine operator
hydroelectric technician
animal trainer
16.
As the elements in Group 17 on the Periodic Table
are considered from top to bottom, what happens
to the atomic radius and the metallic character of
each successive element?
A. The atomic radius and the metallic character
Aboth increase.
B. The atomic radius increases and the metallic
character decreases.
C. The atomic radius decreases and the metallic
character increases.
D. The atomic radius and the metallic character
both decrease.
Answer:
Explanation:
When going from top to bottom in any group of the periodic table, the atomic radius always tends to increase
why are cells small?
Answer:
you know what i really dont know but imagine if they were huge
Explanation:
The Aufbau Principle describes that
O electrons with the same spin cannot occupy the same orbital.
electrons will occupy single orbitals within and energy level before doubling up
electrons fill lower energy levels first before occupying higher energy levels.
O electrons in the same level have the same amount of energy
Answer:
electrons fill lower energy levels first before occupying higher energy levels.
Explanation:
The Aufbau's principle describes that electrons fill lower energy levels first before occupying higher energy levels.
In writing the electronic configuration of atoms, the Aufbau's principle is one of the most important principles to consider.
It states that "sublevels with with lower energies are filled up before those with higher energies".
Sublevels do not fill up in numerical order.
