coral reef ..........................
What chemical is banned by the Toxic Substances Control Act (TSCA)?
potassium
cyanide
lead
none of the above
Answer:
Lead
Explanation:
5
#1
°Fahrenheit
314
°Celsius Kelvin
20
60
290
10
40
280
0
AN
Each dash
Each dash
counts
by...
Each dash
counts by...
counts by...
Fahrenheit:
Celsius
Kelvin
# 2
At what temperature does water freeze in Farenheit, Celsius
and Kelvin? (pg 13 ESRT)
Answer:
#2 water freezes at 32F ,0 °C ,273.2K
What happens after coral is bleached?
It dies immediately
It produces peroxides
It is susceptible to starvation
It releases algae into the ocean
Explanation:
The Answer Is
That The Coral Releases Its Colours And Becomes Pale White
Na + - FeCl, - _NaCl + Fe
NO LINKS!!!!
Answer:
2Na + FeCl2 → 2NaCl + Fe (sodium)
Explanation:
Cells are the basic unit of structure and function in living
things. True or false
Answer:
This statement is true
For a particular reaction at 135.4 °C, Δ=−775.41 kJ/mol, and Δ=817.91 J/(mol⋅K).
Calculate ΔG for this reaction at 12.7 °C.
Δ=
Answer:
[tex]-675.053\ \text{kJ/mol}[/tex]
Explanation:
[tex]\Delta G[/tex] = Gibbs free energy = [tex]-775.41\ \text{kJ/mol}[/tex]
[tex]\Delta S[/tex] = Change in entropy = [tex]817.91\ \text{J/mol K}=0.81791\ \text{kJ/mol K}[/tex]
[tex]T[/tex] = Temperature = [tex]135.4^{\circ}\text{C}=408.55\ \text{K}[/tex]
[tex]\Delta H[/tex] = Change in enthalpy
Gibbs free energy is given by
[tex]\Delta G=\Delta H-T\Delta S\\\Rightarrow \Delta H=\Delta G+T\Delta S\\\Rightarrow \Delta H=-775.41+408.55\times 0.81791\\\Rightarrow \Delta H=-441.253\ \text{kJ/mol}[/tex]
[tex]T=12.7^{\circ}\text{C}=285.85\ \text{K}[/tex]
[tex]\Delta G=\Delta H-T\Delta S\\\Rightarrow \Delta G=-441.253-285.85\times 0.81791\\\Rightarrow \Delta G=-675.053\ \text{kJ/mol}[/tex]
The required Gibbs free energy is [tex]-675.053\ \text{kJ/mol}[/tex].
how many mols of Ti is 3.15 * 10^23 atoms of Titanium
Answer: There are 0.523 moles of Titanium in [tex]3.15\times 10^{23}[/tex] atoms of Titanium
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}[/tex]
[tex]\text{Number of moles of Titanium}=\frac{3.15\times 10^{23}}{6.023\times 10^{23}}=0.523moles[/tex]
A fire women dropped a person onto the safety net.Right before the person hit the net he had a velocity of 11.2m/s and 1800 J of kinetic energy. What was the mass of the person?
Explanation:
kinetic energy = ½mv²
1800 = ½ × m × 11.2²
1800 = ½ × m × 125.44
3600 = 125.44m
m = 3600/125.44
m = 28.7 Kg
Problems 307 How many milliliters of a 2.5 M NaCl solution would be needed to prepare each solution? a. 1.5L of a 0.75m solution
Answer:
450 mL
Explanation:
First we calculate how many NaCl moles would there be in 1.5 L of a 0.75 M solution, using the definition of molarity:
Molarity = moles / LitersMoles = Molarity * LitersMoles = 1.5 L * 0.75 M =1.125 molOnce again using the definition of molarity, we now calculate how many liters of a 2.5 M solution would have 1.125 moles:
Liters = 1.125 mol / 2.5 M = 0.45 LFinally we convert 0.45 liters to mL:
0.45 L * 1000 = 450 mLPLEASE HELP! DUE IN 5 MINS SUPER EASY CHEMISTRY!!
Which of the following compounds contain the largest number of atoms?
Answer:
C
Explanation:
Since they all are 2 mols worth, all you have to do is count the number of atoms in each molecule
H2SO4 contains 2 hydrogen 1 sulfur 4 oxygen = 7 atoms
H2S contains 2 hydrogen and 1 sulfur = 3 atoms
H3PO4 contains 3 hydrogens 1 phosphorus 4 oxygens = 8 atoms
HNO3 contains 1 hydrogen 1 nitrogen and 3 oxygens = 5 atoms
You have the right answer.
A certain substance, X, decomposes. 75 % of X remains after 100 minutes. How much X remains after 200 minutes if the reaction order with respect to X is the following order: zero order, first order and second order.
5. What is the Moh's hardness scale? Can a mineral with a
hardness of 3 scratch a mineral with a hardness of 5?
What is the value of Q when 100.0 mL of a 7.6 10-4 M Mg(NO3)2 is added to 100.0 mL of 7.1 10-4 M NaOH? (Ksp for Mg(OH)2 = 8.9 ✕ 10-12)
Answer:
Q = 4.8x10⁻¹¹
Explanation:
The solubility of Mg(OH)₂ is:
Mg(OH)₂(s) → Mg²⁺(aq) + 2OH⁻(aq)
And Ksp is:
Ksp = [Mg²⁺] [OH⁻]²
Where [] are concentrations in equilibrium
Thus, Q could be defined as:
Q = = [Mg²⁺] [OH⁻]²
Where [] are actual concentrations
[Mg(NO₃)₂] = [Mg²⁺]
And [NaOH] = [OH⁻]
Both solutions are diluted twice (Because 100mL of each solution are diluted to 200mL). The equilibrium concentrations are:
[Mg²⁺] = 7.6x10⁻⁴M / 2 = 3.8x10⁻⁴M
[OH⁻] = 7.1x10⁻⁴ / 2 = 3.55x10⁻⁴M
That means Q is:
Q = [3.8x10⁻⁴M] [3.55x10⁻⁴M]²
Q = 4.8x10⁻¹¹
An electromagnetic is to classify what..
A. Matter
B. Energy
Answer:
B Energy
Explanation:
it's not an object it is some type of radiation
How many moles would you need to have 7.85 x 10^22 molecules of ammonia (NH3).
0.130 moles NH₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 7.85 × 10²² molecules NH₃
[Solve] moles NH₃
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 7.85 \cdot 10^{22} \ molecules \ NH_3(\frac{1 \ mol \ NH_3}{6.022 \cdot 10^{23} \ molecules \ NH_3})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 0.130355 \ moles \ NH_3[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.130355 moles NH₃ ≈ 0.130 moles NH₃
what is basic buffer
Answer:
It is the solution of a mixture of a weak base and a salt of this weak base with a strong acid.
Explanation:
An aluminum pan and a copper pan have the same mass and are heated to the same temperature. Which will feel hotter?
Answer:
The copper pan!
Explanation:
Copper conducts heat well because its atoms contain only one free valence electrons in the outer shell. Elements with a low number of valence electrons transfer heat the best, and copper has only one. Valence electrons move about freely.
Good luck on your assignment!
How does plastic impact the environment as a result of human activities
Answer:
As a result of human activities, plastic impacts the envionment in negative way that leads to serious environmental danger.
Explanation:
When we don't throw away plastic materials correctly, it causes littering. Well, this can also lead to piles of that, meaning that it is spreading toxins. Littering may also lead to blockages in flowing streams, lakes, river, ground water, big bodies of water, and small bodies of water. This also can contribute to global warming because plastic are made from chemicals that come from the production of fuels like oil, gas, coal and possible more.
Which of the following statements apply to the general experimental procedure for determining the heat of reaction as described in the experiment reading? One or more may be correct and you will receive negative points for incorrect answers.
A. Measurements of the temperature of the solution in the calorimeter should be taken at regular intervals for several minutes before the reactant is added.
B. The solution in the calorimeter should not be stired during the experiment because stirring wil slow the reaction
C. The solution calorimeter does not need to be rinsed or dried between runs because the reaction solutions are all aqueous.
D. Temperature readings need to be taken at regular intervals after the highest temperature reading is observed to determine the rate of heat loss from the calorimeter.
Answer:
The following statements apply to the general experimental procedure for determining the heat of reaction:
A. Measurements of the temperature of the solution in the calorimeter should be taken at regular intervals for several minutes before the reactant is added.
B. The solution in the calorimeter should not be stirred during the experiment because stirring will slow the reaction
D. Temperature readings need to be taken at regular intervals after the highest temperature reading is observed to determine the rate of heat loss from the calorimeter.
Explanation:
I need help with the true or false
Answer:
1. True
2. True
3.True
4. False
5. True
6. False
7.True
Explanation:
Heat transfer by radiation is a good example by which of the following.
Number of atoms of C in 14 moles of C4H10 are:
5.81x10^23
24.09x10^23
84.31x10^23
337.23x10^23
Hhelllp mee faastttt! Pls
Jeff wants to record the diameter of a long, thin wire using an instrument. Which of the following instruments should be use? A Altimeter B Microscope c Measuring scale D.Micrometer
Answer:
D
Explanation:
If anyone knows how to do this, please help :(
Answer:
27: B or 2
28: E or 5
29: D or 4
Explanation:
QUESTION 1
How many moles of Cl2 are needed to react with 1.15 moles of F2?Use the following balanced equation for the solving the problem
Cl2 + 3 F2 - 2 CIF3
Answer:
0.383 mole [tex]Cl_{2}[/tex]
Explanation:
Using dimensional analysis, we can find the number of moles of [tex]Cl_{2}[/tex] needed to react with 1.1 moles of [tex]F_{2}[/tex].
Which type of bonding is present when valence electrons move within the sample?
A. metallic bonding
B. hydrogen bonding
C. covalent bonding
D. ionic bonding
Answer:
Metallic bonding.....
Physical or chemical change: mixing salt and garlic together.
Answer: physical
Explanation:
The salt and garlic can still be easily separated. No new substance was formed.
Which describes the polarity in a water molecule?
A. partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms
B. partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms
C. partial positive charge on the oxygen atom because it pulls electrons from the hydrogen atoms
D. partial positive charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms
The answer is B
Answer:
B. partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms
Explanation:
Oxygen has a charge of 6 so they need to pull 2 electrons from hydrogen, which creates a partial negative charge.
What is different types of
Metal
Answer:
copper metal and steel metak
Answer:
Every element to the left of the staircase on the Periodic Table is a metal, excluding Hydrogen, and everything to the right of that staircase is a non-metal.
Explanation:
i) __________are rigid due to strong (ii)___________ of attraction between the particles
Answer:
Liquid Solids are rigid due to strong glass of attraction between the particles.
Explanation: