The water from inside the test tube most likely came from the blue copper sulfate crystal which is a hydrated salt.
Hydrated saltsHydrated salts contain water of hydration.
A blue copper sulfate crystal contains water of hydration.
When heated, the water evaporates off to give an anhydrous salt which appears colorless.
The equation of the reaction is as follows:
CuSO4•5H2O -----> CuSO4 + 5H2O(g)
More on water of hydration can be found here: https://brainly.com/question/919417
In stoichiometric calculations, which quantity MUST be used to convert from one chemical substance to another?
А
percent composition
B
percent yield
C mole ratio
D
molar mass
The answer is
C) mole ratio
I will give brainliest. 1. A spiderweb and a Kevlar jacket have some obvious differences. Which property is similar between the web and the jacket?
- surface area
- thickness, expressed as a number of atoms
- overall strength
- arrangement of atoms in molecules
2. 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?
- A much larger amount of silk might be needed to produce the same effect.
- Spiderweb silk would likely be rejected by the body.
- The cost might be higher for producing spiderweb silk.
- Spiderweb silk likely involves more chemicals.
3. Which microscopic detail affects the strength of different forms of silk?
- Different silk strands are made with different types of atoms.
- Different types of silk are in long strands or in other very different arrangements.
- Different silk strands have different combinations of amino acids.
- Different types of silk do not have the same strength if they come from different sources.
4. Which type silk is the strongest?
- nonbiodegradable
- minor ampullate
- major ampullate
- biodegradable
5. Which natural source has been bioengineered to make silk proteins?
- mulberry leaves
- goat milk
- goat hair
- mulberry bark
Answer:
arrangement of atoms in molecules.A much larger amount of silk might be needed to produce the same effect.- Different silk strands have different combinations of amino acids. .major ampullate.goat milkExplanation:
Using Organic Compounds quick check
do you know the refining design quick check
Answer: connections academy?
Explanation: do you go there? I saw that you were answering questions and asking for help on the midterm for A&P and the same one is currently on schedule for me
Determine the empirical formulae of the compounds which contain:
9.39g P, 0.61 g H
The empirical formula of the compound containing 9.39 g of phosphorus and 0.61 g of Hydrogen is PH₂
Data obtained from the question Phosphorus (P) = 9.39 gHydrogen (H) = 0.61 gEmpirical formula =? How to determine the empirical formulaThe empirical formula of the compound can be obtained as follow:
Divide by their molar mass
P = 9.39 / 31 = 0.303
H = 0.61 / 1 = 0.61
Divide by the smallest
P = 0.303 / 0.303 = 1
H = 0.61 / 0.303 = 2
Thus, the empirical formula of the compound is PH₂
Learn more about empirical formula:
https://brainly.com/question/26273076
68.5g of C3H8 are reacted with 83.4g of O2 in the following reaction. how many grams of the excess reactant must remain unreacted
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
mole C₃H₈ = 68.5 : Mr C₃H₈ = 68.5 : 44 g/mol = 1.557
mole O₂ = 83.4 : Mr O₂ = 83.4 : 32 g/mol = 2.606
to find limiting reactants :
divide the number of moles by their respective coefficients, and the small quotient will be a limiting reactants
C₃H₈ : O₂ = 1.557/1 : 2.606/5 = 1.557 : 0.521
O₂ as a limiting reactant, C₃H₈ excess reactants
reacted mole of C₃H₈ : 1/5 x 2.606 = 0.5212
unreacted mole of C₃H₈ : 1.557 - 0.5212 = 1.0358
mass of C₃H₈ (unreacted) = 1.0358 x 44/gmol = 45.575 g
Which model could represent a neutral atom of oxygen?
А 1
B. 4
O O O O
o 2
Answer:
it will be b because it is the atom oxygen
Answer:D
Explanation:
I just did it.Brainlist please
What helps to determine what a biome is like?
Government, economy, and culture
Light, water, temperature, and wind
Light, temperature, and elevation
Water, wind, and economy
Answer:
Light, water, temperature, and wind
Explanation:
A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60. 0 mL of a 0. 100 M NaOH solution. The equation for the reaction is given below. HCl NaOH Right arrow. NaCl H2O What was the original concentration of the HCl solution? 0. 040 M 0. 25 M 1. 50 M 2. 50 M.
Answer:
The balanced chemical reaction is expressed as:
HCl + NaOH ---> NaCl + H2O
We are given the amount and the concentration of the sodium hydroxide reactant. This will be the starting point for the calculations.
0.100 mol NaOH/L solution (0.06 L solution) ( 1 mol HCl / 1 mol NaOH) = 0.006 mol HCl
Molarity = amount in moles / Volume of solution = 0.006 mol HCl/ 0.150 L
Molarity = 0.04 M
Explanation:
Which type of wave interaction is shown in the photo? with ISSN AN O A. Diffraction O B. Reflection O C. Refraction O D. Absorption
I'm not sure what physical science would be under so I picked chemistry, sorry if it's wrong.
HELP ASAP!
Answer:
Diffraction
Explanation:
What scientist formalized a theory of the atom that gained broad acceptance?.
Answer:
Dalton
Explanation:
Rutherford Dalton Democritus, stated that all matter was made up of small, indivisible particles known as 'atoms'.
A 52-kg woman has 7.2 x 10-mol of hemoglobin (molar mass =
64456 g/mol ) in
her blood. How many hemoglobin molecules is this?
There are 6.022 x 1023 molecules per mole (Avogadro's number). As there are 7.2 x 10-3 moles of hemoglobin, the number of hemoglobin molecules would be 6.022 x 1023 molecules/mole x 7.2 x 10-3 moles = 4.3 x 1021 molecules
A 52-kg woman has 7.2 x 10 mol of hemoglobin in her blood. The quantity of hemoglobin molecules is 4.3 x 10²¹ molecules.
What is hemoglobin?Red blood cells include the protein hemoglobin, which transports oxygen to your body's organs and tissues, and carbon dioxide from those tissues back to your lungs.
You have a low red blood cell count if a hemoglobin test finds that your hemoglobin level is lower than normal (anemia).
Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
There are 6.022 x 1023 molecules per mole (Avogadro's number).
As there are 7.2 x 10⁻³ moles of hemoglobin, the number of hemoglobin molecules would be 6.022 x 10²³ molecules/mole x 7.2 x 10⁻³ moles = 4.3 x 1021 molecules.
Therefore, the number of hemoglobin molecules is 4.3 x 10²¹ molecules.
To learn more about hemoglobin, refer to the link:
https://brainly.com/question/27022498
#SPJ5
Convert the following word equations into formula equation
element and compound names into chemical formulas.
1. Sodium + oxygen → sodium oxide
Answer:
gas
Explanation:
it makes a gas there
Put the basic steps of pyruvate oxidation in order.
Answer:
1. carboxyl group is removed from pyruvate and releases 1 co2 molecule and leaves 2 carbon molecules
2. 2-carbon molecule is oxidized and electrons lost in oxidation are picked up by nad+ to form Ndah
3. oxidized 2 carbon molecule is attached to coenzyme a to form ACETYL COA
Explanation:
Help me please( ╹▽╹ )
Lower temperature
Let's verify
Pressure=Pvolume=VTemperature=TAs per Boyles law
[tex]\\ \rm\Rrightarrow V\propto \dfrac{1}{P}[/tex]
As per Charles law
[tex]\\ \rm\Rrightarrow V\propto T[/tex]
[tex]\\ \rm\Rrightarrow T\propto \dfrac{1}{P}[/tex]
So
At higher altitudes lower the pressure so lower the temperature
How much Mercury (II) Oxide is needed to produce 198g of Oxygen?
Answer:
The Same Of this Equetion Answer
Explanation:
First we need to convert the chemical equation that you wrote out in words into a chemical equation with compounds and coefficients. The balanced chemical equation looks like this:
2 HgO (s) --> 2 Hg (l) + O2 (g)
Now we need to convert the 55.7 g of HgO into moles of HgO. To do this, we find the molar mass of HgO. The periodic table tells us that the atomic mass of one Hg is 200.59. The periodic table also tells us that the atomic mass of one O is 15.999. Thus, the molar mass of HgO is 200.59 + 15.999 = 216.589 grams. That is, one mole of HgO = 216.589 grams of HgO.
We need to figure out how many moles are in 55.7 grams of HgO. We calculate this by doing 55.7 divided by 216.589. The calculator says that 55.7 / 216.589 = 0.25716911. So 55.7 grams of HgO is equal to 0.25716911 mole of HgO.
Now we use the coefficients in the balanced equation to convert from moles of HgO to moles of O2. The equation to convert looks like this:
moles of HgO x coefficient of O2
coefficient of HgO
In case the formatting messes up, this is moles of HgO multiplied by (coefficient of O2 / coefficient of HgO). We already know the moles of HgO (it's the 0.25716911 moles of HgO that we just calculated). The coefficients come from the balanced equation; here it is again: 2 HgO (s) --> 2 Hg (l) + O2 (g) . The coefficient of HgO is 2, and the coefficient of O2 is 1. (Remember that if there is no visible coefficient, the coefficient is 1.) If we put these numbers in the equation to convert, the equation to convert looks like this:
0.25716911 moles of HgO x 1
2
If you can't see this, we do 0.25716911 x (1/2). The calculator says that 0.25716911 x (1/2) = 0.12858455. Thus, we have 0.12858455 moles of O2. Remember that the question asks for the volume of O2. Now we need to use the ideal gas equation to find the volume of the 0.12858455 moles of O2. The ideal gas equation is:
PV = nRT
Remember that P is pressure in atm, V is the volume of the gas in liters, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin. So far we know that P = 1 atm (the problem gave us this information), V is what we want to find, n = 0.12858455 moles of O2, and T = 25 degrees Celsius. But we must have the temperature in Kelvin, so we convert from Celsius to Kelvin with the equation
K = C + 273.15. Since the temperature is 25 degrees Celsius, K = 25 + 273.15 = 298.15. So the temperature is 298.15 K. Finally, R = 0.082057 L*atm/(K*mol). (You can look up the value for R in a table or chart; you don't need to memorize it.) Once we put these values into the ideal gas equation, the ideal gas equation looks like this:
1*V = (0.12858455)*(0.082057)*(298.15)
Since 1*V is equal to V, we can just write V instead of 1*V. So our equation looks like this:
V = (0.12858455)*(0.082057)*(298.15)
Now we just multiply the numbers together. The calculator says that (0.12858455)*(0.082057)*(298.15) = 3.14589. Remember that the correct unit for volume is liters. Thus, the volume of O2 is 3.14589 L. We should round to 3 significant figures because the problem gave us the number 55.7 (which has 3 significant figures). If we round 3.14589 to 3 significant figures, we get 3.15. Thus, the answer is 3.15 L of O2.
Someone please answer i’ll give brainly.
How many atoms of carbon of 6 molecules of C2H2
Answer:
12
Explanation:
2 per molecule X 6 molecules in total = 12
Answer:
12
Explanation:
6×2
Eny thing to explain?
According to the passage, this model represents __________.
A )Solar eclipse
B) Lunar eclipse
C) 1st quarter moon
D) Last quarter moon
Answer:
This model represents Solar Eclipse.Explanation:
#CarryonlearningWhich natural source has been bioengineered to make silk proteins?
O goat milk
O mulberry leaves
O goat hair
O mulberry bark
Answer:
A. goat milk
Explanation:
Took the Quick Check
A mutation is a change in the DNA base sequence. What effect would this have on a protein?
Answer:
Consequently, once it encounters the mutation, the ribosome will read the mRNA sequence differently, which can result in the production of an entirely different sequence of amino acids in the growing polypeptide chain.
Explanation:
Answer:
A missense mutation is when the change of a single base pair causes the substitution of a different amino acid in the resulting protein. This amino acid substitution may have no effect, or it may render the protein nonfunctional.
Can u help me plsasp u don’t have to rush but I am in a rush.
Answer:
nucleus
Explanation:
lesson 5 researching economics
Economic research or research in economics helps to provide data that is relevant and crucial to making forecasts and decisions relating to the economic activity of a state or an organization.
How does Economic research help the economy?
Research and Development in the field of economics aid in ensuring that expenditure is wisely dissipated to ensure maximum national productivity.
Results from proper economic research can be used to create a framework for effective innovations and public policies.
Learn more about Economic research at:
https://brainly.com/question/10564789
what are the three rules of thermodynamics?
According to this law, some heat given to the system is used to change the internal energy while the rest is used in doing work by the system.
This relationship is mathematically represented as follows:
ΔQ = ΔU + W
where ΔQ is the heat given or lost, ΔU is the change in internal energy and W is the work done.
The second law of thermodynamics :If a room is not tidied or cleaned, it invariably becomes more messy and disorderly with time.
When the room is cleaned its entropy decreases but the effort to clean it has resulted in an increase in entropy outside the room that exceeds the entropy lost.
The Third law of thermodynamics :The entropy of a pure crystalline substance (perfect order) at absolute zero temperature is zero. This statement holds true if the perfect crystal has only one state with minimum energy.
please help me get the answer to bothe a and b
Answer:
If a metal and metal solution react, the more reactive metal will displace the less reactive metal from solution. If the metal in solution you start with is formed from a more reactive metal than the metal to be added, no reaction will occur.
What is the difference between nuclear mass and atomic mass?.
Whạt visible indication is there that a chemical reaction is occurring
Answer:
color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Marcus and his brother always argue about who will walk the dog. Their father wants to find a random way of deciding who will do the job. He invented a game to help them decide. Each boy will have a bag with three colored blocks in it: one yellow, one green, and one white. Each night before dinner, each boy draws a block out of his bag. If the colors match, Marcus walks the dog. If the two colors do not match, his brother walks the dog. Marcus's father wants to be sure that the game is fair. a. Make a probability tree of all of the possible combinations of draws that Marcus and his brother could make. How many possibilities are there? b. What is the probability that the boys will draw matching blocks?
By studying the experiment, we will see that:
a) There are 9 possible outcomes (listed in the answer) all with the same probability.
b) The probability of drawing matching blocks is 1/3.
How to know if the game is fair?
The game is fair if and only if the two outcomes have the same probability.
Here the two outcomes that we care for are:
The colors match.The colors do not match.a) First, in each bag all the blocks have the same probability of being drawn, which is 1/3.
Then each combination will have the same probability, which is:
p = (1/3)*(1/3) = 1/9.
Now, the possible combinations of colors are given by the table:
Marcus Brother probability
yellow yellow 1/9
yellow green 1/9
yellow white 1/9
white yellow 1/9
white green 1/9
white white 1/9
green yellow 1/9
green green 1/9
green white 1/9
b) The probability that the boys draw matching blocks is given by the sum between the probabilities that they draw 2 yellow blocks, 2 green blocks, and 2 white blocks, this is:
P = 1/9 + 1/9 + 1/9 = 1/3.
If you want to learn more about probability, you can read:
https://brainly.com/question/251701
2. How many moles are in 6.55 x 108 grams of H2O?
3.63x10^7 moles
Answer:
Who helped Hernán Cortés and his soldiers defeat the Aztec?
ASAP
What is the pressure in atm of 0.47mol of a gas in a 1.7L container at 276K?
Answer:
p= 6.26 atm
Explanation:
Recent data indicates atmospheric carbon dioxide (CO2) levels are rising. What change in the carbon cycle has most likely caused this increase in atmospheric CO2?.
The atmospheric carbon dioxide has been increased due to the increased industrial gases and the greenhouse effects.
What is the carbon cycle?The carbon cycle has been given as the rotation of the carbon in the atmosphere in different forms. The carbon has been absorbed by plants and the degradation passed the carbon from the plants forms the transfer of carbon to the soil.
The increased activities such as industrial gases, greenhouse gases, and other effects resulted in the increased carbon in the atmosphere and thereby the interruption to the carbon cycle.
Learn more about the carbon cycle, here:
https://brainly.com/question/1627609
What are the components of a voltaic cell?
Answer:
• The anode is an electrode where oxidation occurs.
• The cathode is an electrode where reduction occurs.
• A salt bridge is a chamber of electrolytes necessary to complete the circuit in a voltaic cell.
• The oxidation and reduction reactions are separated into compartments called half-cells.
•The external circut is used to conduct the flow of electrons between the electrodes of the voltaic cell and usually includes a load.
• The load is the part of the circuit which utilizes the flow of electrons to perform some function.
I WILL GIVE BRAINLIEST!!
What are two elements that will react similarly to Beryllium
(Be)? Explain how you know.
The two elements with properties most like beryllium are magnesium and aluminium.
Explanation;
Beryllium and magnesium are two adjacent alkaline earth metals. That means; both these chemical elements are in the same group (group 2), but in different periods, i.e., beryllium is in the 2nd period while magnesium is in the 3rd period.
