Hope it helps ~
Assignment 1 due tomorrow need yr help huuryyy plsss
Answer:
An input of heat energy Yr don't you know stupied
The atomic number of Oxygen is 8. Therefore, which of the following answers would correspond to what would be in the nucleus of an oxygen atom
Answer:
Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus. ... Oxygen is normally found as a
1) How would the temperature change and the calculated heat of neutralization vary if the
volumes remained the same but the concentrations of the acid and the base were
doubled? Explain.
2) How would the temperature change and the calculated heat of neutralization vary if the
concentrations remained the same but the volume of the acid and base was cut in half?
Explain.
Answer:
1) The standard enthalpy change of neutralization is the enthalpy change when solutions of an acid and an alkali react together under standard conditions to produce 1 mole of water. Notice that enthalpy change of neutralization is always measured per mole of water formed. Enthalpy changes of neutralization are always negative - heat is released when an acid and and alkali react. For reactions involving strong acids and alkalis, the values are always very closely similar, with values between -57 and -58 kJ mol-1. That varies slightly depending on the acid-alkali combination (and also on what source you look it up in!).
2)same of n1
Calculate the number of moles in 10g of ammonium carbonate.
Answer:
0.10417 mol
Explanation:
first step you find the mr of ammonium carbonate { (NH4)2CO3 }
mr of (NH4)2CO3:
=(2×Ar of N) + (8×Ar of H) + (1×Ar of C) + ( 3× Ar of O)
=(2×14) + (8×1) + (1×12) + (3×16)
= 28 + 8 + 12 + 48
=96
no of moles = mass ÷ mr
= 10 ÷ 96
= 0.10417 mol
1. The maximum recommended amount of citric acid (H3C6H5O7; the 3 hydrogens listed first are the acidic hydrogens – the only hydrogens that react in a neutralization reaction) in skin creams, serums, and lotions is 0. 50% by mass. A face serum containing citric acid is sold in a 250. 0 mL bottle. If the face serum has a density of 0. 979 g/mL, how many grams of citric acid is in the bottle of serum?.
The density has been given as the mass of the substance per volume of the solution. The mass of citric acid in the bottle has been 1.22 grams.
What is percent mass?Percent mass can be given as the mass of substance in the total mass of the solution.
The volume of the face serum has been 250 mL, and the density is 0.979 g/mL.
The mass of face serum in the bottle has been:
[tex]\rm Density=\dfrac{Mass}{Volume}\\ 0.979\;g/mL=\dfrac{Mass}{250\;mL}\\ Mass=244.75\;g[/tex]
The total mass of face serum has been 244.75 grams.
The percent mass of citric acid in face serum is 0.5%. This states the presence of 0.5-gram citric acids in 100 grams sample.
The mass of citric acid in the face serum sample is given as:
[tex]\rm 100\;gram\;sample=0.5\;g\;H_3C_6H_5O_7\\\\244.75\;grams\;sample=\dfrac{0.5}{100}\;\times\;244.75\;grams\; H_3C_6H_5O_7\\\\244.75\;grams\;sample=1.22\;grams\;H_3C_6H_5O_7[/tex]
The mass of citric acid present in 250 mL serum sample has been 1.22 grams.
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What’s the definition of concentration
Explanation:
Concentration means that you concentrate really gard on something abd can't see others around you.
how many atoms in 8.2 moles of zinc
Answer:
4.94x10^24 atoms Zn
Explanation:
By definition, there are 6.022x10^23 atoms in a mole of a substance. This is a conversion factor:
(6.022x10^23 atoms/mole)
(8.2 moles Zn)* (6.022x10^23 atoms/mole) = 4.94x10^24 atoms Zn
Calculate ΔH° for the process Co 3 O 4(s) ⟶ 3Co(s) + 2O2(g) from the following information:Co(s) + 21O2(g) ⟶ CoO(s) ΔH° = −237.9kJ3CoO(s) + 21O2(g) ⟶ Co3 O4(s) ΔH° = −177.5kJ
Answer:
The answer to your question is ∆Hrxm= – 23.9 kJ
What substance is used to standardize the naoh solution during the part 2 activities?.
Answer:
GAS strand
Explanation:
Used to standarized strand to make solution to fasten the calculation
Question 17 An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull? (a) Mustard oil (b) Soft drink (c) Coconut oil (d) Kerosene
Answer:
(b) Soft drink
Explanation:
Because soft drinks contain carbonic acid, which reacts with the iron nail. An iron nail kept in a soft drink will lose its shine and appear dull. Because mustard oil, coconut oil, and kerosene have no reaction with iron nails, they do not lose their shine when maintained in these solutions.
How might atomic radius have any influence on electronegativity trends or no influence on ionizatation
7) When you are listening to orchestral music, what type of energy are you 1 point
hearing?
Electromagnetic energy
Electrical energy Sound energy Thermal energy ( heat )
I would believe the answer is sound energy because the sound that orchestral gives off, gives off some energy even though it isn't necessarily comparable to other sources of energy.
Hope that helped!
Answer:
yes yes yes yes yes yes yes yes yes yes
How many moles of carbon dioxide are in 3. 33 x
1024 molecules of carbon dioxide?
Answer:
1 mole of CO2 has 6.02 x 10^23 molecules of CO2. Say x moles of CO2 has 3.0x10^23 molecules of CO2. Therefore x = 3/6.02 = 0.50. M = 0.50 * (12 + 2x16) = 0.50 * 44 = 22g.
What caused the objects kinetic energy to change
Answer:
A net force acting on an object will change its motion. This means that a net force will change the kinetic energy of an object. The greater the force, the greater the change in motion and the kinetic energy of the object. Objects moving at a constant speed will have a constant kinetic energy.
find the number of Fe2O3 moles needed to release 12 moles of CO2 .
Answer:
Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)
Explanation:
Need help with balancing chemical equations!
[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]
The balanced equation for given reaction is ~
[tex] \sf 2 \: Al(OH)_3 +3 \: H_2SO_4 = Al_2(SO_4)_3 +6 H_2O[/tex]
And here, the Coefficient of H2O is 6
[tex]\\ \rm\Rrightarrow 2Al(OH)_3+3H_2SO_4\longrightarrow Al_2(SO_4)_3+6H_2O[/tex]
on both sides
Al=2OH=6SO_4=3Hence balanced
Coefficient of H_2O is 6
Assuming silk from spiderwebs could be made just as strong as Kevlar, why would a company still choose to use Kevlar in producing bulletproof fabrics? (1 point)
A.Spiderweb silk likely involves more chemicals.
B.The cost might be higher for producing spiderweb silk.
C.A much larger amount of silk might be needed to produce the same effect.
D.Spiderweb silk would likely be rejected by the body.
Answer:
C. A much larger amount of silk might be needed to produce the same effect
Explanation:
As you may know it will take a lot of silk to make bullet proof fabric out of it.
Answer:
I Guess C
Explanation:
The availability of spider silk is not enough for what is needed, so i believe C is the right answer. But that means that B is also a bit correct .
In CO2, how many UNSHARED pairs of electrons does each oxygen have?
a. 4
b. 6
c. 1
d. 2
explain why
Answer:
2, I believe.
Explanation:
In the cO2 molecule, each oxygen atom has two lone pairs of electrons. The carbon atom has no lone pairs.
Explanation:
In the cO2
molecule, each oxygen atom has two lone pairs of electrons. The carbon atom has no lone pairs. The carbon-oxygen bonds are double bonds.
How many moles are in 3.45 x 1023 molecules of CO2?
(I got 0.057 but past me got 0.573)
N = n x No
n = N/No
No = avogadro's number, 6.02 x 10²³
[tex]\tt \dfrac{3.45\times 10^{23}}{6.02\times 10^{23}}=0.573[/tex]
HELP!!as soon as possible ┐(‘～`;)┌
The numerical value of equilibrium constant depends on
TemperatureAs the Temperature increases the value of equilibrium constant decreases and when the Temperature decreases the equilibrium of constant increases. That means they are inversely proportional..
The numerical value of the equilibrium constant depends on the temperature (Option 1).
What is the equilibrium constant?The equilibrium constant refers to the exact value in a chemical reaction when products and reactants are found in a state of equilibrium.
A chemical reaction is a process where one or more reactants are converted into one or more products.As the temperature increases, the numerical value of this constant decreases and vice-versa.In conclusion, the numerical value of the equilibrium constant depends on the temperature (Option 1).
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1.
7.5A In what form do plants store the energy produced from sunlight?
Answer:
photosynthesis
Explanation:
Bc it is
How many amino acids do three nucleotides code for.
Answer:
one amino acid
Explanation: its right
Lab Report
Ocean Currents
It’s time to complete your Lab Report. Save the lab to your computer with the correct unit number, lab name, and your name at the end of the file name (e.g., U2_ Lab_OceanCurrents_Alice_Jones.doc).
What were the independent, dependent, and control variables in your investigation? Describe the variables for each part of the experiment.
Dependent variables are those that need a stimulus to present themselves. The independent variables are those that do not need a stimulus to present themselves and the control variables are the elements that remain unchanged throughout the experiment.
Importance of variablesThey present the relationship between the elements of the experiment.Allow hypotheses to be tested.Allows comparisons between experimental treatments.They encourage the evaluation of experimental data.To increase the understanding of these variables, we can use as an example an experiment that seeks to evaluate the influence of root growth of transgenic corn with water stress. In this experiment, five plants of transgenic corn will suffer different levels of water stress, while one plant of the same corn will not suffer this stress and will be watered normally.
According to this, root growth is a variable that needs a stimulus to present itself, so this is the dependent variable. Water stress does not need any stimulus, being the independent variable. Finally, the corn plant that will not suffer any type of stress will remain unchanged throughout the experiment, being the control variable.
You didn't show the experiments your question refers to, which prevents me from providing an exact answer, but I hope the information above can help you.
More information about dependent and independent variables at the link:
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Answer:
Dependent variables are those that need a stimulus to present themselves. The independent variables are those that do not need a stimulus to present themselves and the control variables are the elements that remain unchanged throughout the experiment.
Importance of variables
They present the relationship between the elements of the experiment.
Allow hypotheses to be tested.
Allows comparisons between experimental treatments.
They encourage the evaluation of experimental data.
To increase the understanding of these variables, we can use as an example an experiment that seeks to evaluate the influence of root growth of transgenic corn with water stress. In this experiment, five plants of transgenic corn will suffer different levels of water stress, while one plant of the same corn will not suffer this stress and will be watered normally.
According to this, root growth is a variable that needs a stimulus to present itself, so this is the dependent variable. Water stress does not need any stimulus, being the independent variable. Finally, the corn plant that will not suffer any type of stress will remain unchanged throughout the experiment, being the control variable.
You didn't show the experiments your question refers to, which prevents me from providing an exact answer, but I hope the information above can help you.
Explanation:
If a sound is loud and low-pitched, the sound wave also has which of the following properties?
a: low frequency and high amplitude
b: low frequency and low amplitude
c: high frequency and high amplitude
d: high frequency and low amplitude
[tex] \huge \qquad \underline{ \boxed{ \sf Answer}}[/tex]
Here's the Explanation ~
Loudness depends on Amplitude,
Increase in Amplitude = Increase in loudnessPitch depends on frequency,
Increase in frequency = Increase in pitchTherefore, the correct choice is :
A. low frequency and high amplitude
Fun fact ( added by me )
Generally guys have low pitched voice, so it's actually easy to understand what they say even if they speak fast, but in case of girls there's a shrill type of voice with High pitch ( frequency ) such that sometimes it's hard to understand what they are saying if they are fast, also it's kind of irritating. [ don't get serious about it lol ]
Analysis
1. Organizing Results Group the white substances into two groups according
to their properties.
The properties of substances can be used to put the into groups.
Grouping of substancesIn chemistry, it is often necessary to put substances into groups based on similarity in their properties. This is what led to the idea of a periodic table of elements.
Similarly, when we have unknown substances, we can group them according to the similarities in their properties.
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hey This is my first E day of learning online so it would mean the world for so help!
(ALSO I MADE IT 98 points)!
Answer:
Explanation:
This is answer to your other question:
Mosquito has the smallest number of chromosomes of the organisms shown. So it will be the simplest for studies. Also because mosquito reproduces within days, you can study effects of any chromosome change on its offspring.
Jamie works at a company that makes
cleaning chemicals. She is trying to make
a chemical that smells like flowers. She
took two samples that were gases at room
temperature and mixed them in a sealed
container. The diagram above shows the
repeating groups of atoms that make up the
two starting substances.
After mixing, Jamie found two substances
that smelled like flowers in the sealed
container. (Nothing had escaped.) Which of
the diagrams to the left show the repeating
groups of atoms that make up the ending
substances?
Answer:
C
Explanation:
Because i got a 100% on it
Which would be the best way to represent the concentration of a 1. 75 M K2CrO4 solution? 1. 75% K2CrO4 [K2CrO4] (K2CrO4) K2CrO4, [M] = 1. 75.
The amount of the solute present in the given solution is called the concentration. The best way to represent the concentration of the solution is [tex]\rm [K_{2}CrO_{4}].[/tex]
What is molar concentration?Molar concentration is the molarity of the solution that is the measure of the concentration of the solute dissolved in the solution.
The formula for calculating molar concentration is given as,
[tex]\rm Molarity = \dfrac{\text{moles of solute}}{\text{Solution in L}}[/tex]
The concentration of any substance is represented in the square bracket like [tex]\rm [X][/tex] or [tex]\rm [K_{2}CrO_{4}].[/tex]
Therefore, option B. [tex]\rm [K_{2}CrO_{4}][/tex] is the representation of the concentration.
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Answer: [K2CrO4]
Explanation:
Which concept can explain the acidic character of Carbon dioxide?
Answer:
The concept of lewis acids and bases can explain the acidic nature of CO2. A lewis acid is a compound which can accept an electron pair whereas a lewis base is a compound which can donate an electron pair. CO2 acts as a lewis acid.
Which of the following statements is true about calcium? (Select all that apply.)
A Calcium is a macronutrient.
B Calcium is a micronutrient.
C Calcium helps to give the plant structure,
D Calcium aids in chlorophyll production
Answer:
Calcium helps to give the plant structure
Explanation:
The true statements about Calcium are ; ( A and C )
Calcium is a macronutrient Calcium helps to give the plant structure Functions of Calcium in PlantsCalcium is a macronutrient that helps in the production of plant tissues and also enables the replacement of deads tissues and growth of plants. It helps to give plants structure by holding toether the cell walls of plants.
Hence we can conclude that the true statements about Calcium are Calcium is a macronutrient and Calcium helps to give the plant structure.
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