Answer:
Substance 1
Explanation:
Because if it becomes a solid BEFORE the other it means that the structure is more sound than the other substance. and if you add heat to something that becomes a solid it means it will come closer
I Hope this helps <3 and again i don't need the crown
Which element has an electron configuration that ends in the fourth energy 1 point
level? *
D
ОО
C
Answer:
here
Explanation:
which is the halogen that is in Period 5? a. iodine (I) b. strontium (Sr) ... 4. Which is a transition element with five d-block electrons in energy level 4? ... Which region contains elements with an electron configuration that ends with p3? a. A b.
Missing: point | Must include: point
What is the speed of a car that has traveled 100 miles in 20 hours?
|
Answer:
5 mph
Explanation:
100 miles, 20 hours (divide by 2)
50 miles, 10 hours (divide by 2)
25 miles, 5 hours (divide by 2)
divide both sides by 5
5 miles, 1 hour
Answer:2
Explanation:
How does the ionosphere help radio transmission?
Explanation:
ionosphere can reflect radio waves directed into the sky back toward the Earth
Calculate the number of milliliters of 0.440 M KOH required to precipitate all of the Fe2+ ions in 187 mL of 0.692 M FeSO4 solution as Fe(OH)2. The equation for the reaction is: FeSO4(aq) + 2KOH(aq) Fe(OH)2(s) + K2SO4(aq)
Answer:
588.2 mL
Explanation:
FeSO₄(aq) + 2KOH(aq) → Fe(OH)₂(s) + K₂SO₄(aq)First we calculate how many Fe⁺² moles reacted, using the given concentration and volume of FeSO₄ solution (the number of FeSO₄ moles is equal to the number of Fe⁺² moles):
moles = molarity * volume187 mL * 0.692 M = 129.404 mmol Fe⁺²Then we convert Fe⁺² moles to KOH moles, using the stoichiometric ratios:
129.404 mmol Fe⁺² * [tex]\frac{2mmolKOH}{1mmolFeSO_4}[/tex] = 258.808 mmol KOHFinally we calculate the required volume of KOH solution, using the given concentration and the calculated moles:
volume = moles / molarity258.808 mmol KOH / 0.440 M = 588.2 mLI GIVE BRAINLIEST IF YOU ANSWER!
Which of these is a characteristic of warm air? (5 points)
a It transfers energy through radiation.
b Its molecules are far apart.
c It sinks due to convection.
d It cools the land below i
Answer:
B.
Explanation:
The air molecules of warm air has higher energy. It causes them to move away from each other
Convert 2.5x10^6mm to km
Answer:
2.5 kilometers
Explanation:
What is a reaction rate? PLEASE HELP
a. measure of the potential energy differences in reactants and products
b. measure of the activation energy needed
c. measure of how fast products are made
d.measure of collisions between molecules
Answer:
c
Explanation:
Reaction rate, in chemistry, the speed at which a chemical reaction proceeds.if you're studying the same thing I am then that would be it
How many significant digits would you report an answer to if you divided 2.654 by 3.2?
answer choices
1
2
3
4
Answer:1
Explanation:
which group of mamaals has the most mebers
Infraclass: Placentals
Placental mammals are the most diverse group of mammals with about 4000 discovered species.
Which statement about the alkali metals is correct?
A. They are usually gases.
B. They are extremely unreactive.
C. They are located in the left-most column of The Periodic Table
D. They form negative ions with a -1 charge
Answer:
its c they are located in the left most column of the periodic table
A roller coaster is accelerating at 10m/s² before it comes to an abrupt stop at the end of the ride. The mass of the roller coaster is 900 kg. How much force was exerted on the roller coaster to bring it to a stop?
Answer:
9000 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 900 × 10
We have the final answer as
9000 NHope this helps you
The atmosphere insulates the planet by trapping in
1. Which of the following is Newton's First Law? *
A-An object in motion will stay in motion unless acted on by a balanced force.
B-An object at rest will stay at rest and an object in motion will stay in motion in the same speed and same direction unless acted on by an unbalanced force.
C-Moving objects will stay in motion forever
Answer:
B .............
hope it helps
Answer: B
Explanation:
5. An anion of carbon C-4 has how many electrons?
a. 6
b. 8
C. 9
d. 10
Answer:
A.6
Explanation:
An atom of carbon can share four electrons. Carbon has a total of six electrons, with two in the first orbital and four in the second orbital.
A chemist used 6.5 moles of water in this reaction. How many grams of water were used?
please go into detail as to why that is the answer PLSSS
Answer:
[tex]\boxed {\boxed {\sf 120 \ or \ 117 \ grams \ H_2O \ depending \ on \ significant \ figures }}[/tex]
Explanation:
We want to convert from moles of water to grams of water.
First, find the molar mass of water (H₂O) Look on the Periodic Table for the masses of hydrogen and oxygen.
Hydrogen (H): 1.008 g/molOxygen (O): 15.999 g/molNext, add up the number of each element in water. The subscript of 2 comes after the H, so there are 2 moles of hydrogen.
2 Hydrogen: (1.008 g/mol*2) = 2.016 g/molFinally, add the molar mass of 2 hydrogen and 1 oxygen.
2.016 g/mol (2 Hydrogen) + 15.999 g/mol (1 oxygen)= 18.015 g/molNext, find the grams in 6.5 moles.
Use the molar mass we just found as a ratio.
[tex]molar \ mass \ ratio: \frac{18.015 \ g \ H_2O}{1 \ mol \ H_2O}[/tex]
We want to find the grams in 6.5 moles. We can multiply the ratio above by 6.5
[tex]6.5 \ mol \ H_2O * \frac{18.015 \ g \ H_2O}{1 \ mol \ H_2O}[/tex]
Multiply. Note that the moles of H₂O will cancel each other out.
[tex]6.5 * \frac{18.015 \ g \ H_2O}{1}[/tex]
[tex]6.5 * {18.015 \ g \ H_2O}[/tex]
[tex]117.0975 \ g \ H_2O[/tex]
If we want to round to the technically correct significant figures, it would be 2 sig figs. The original measurement, 6.5, has 2 (6 and 5).
[tex]\approx 120 \ g \ H_2O[/tex]
Which of the following have the correct pairing of ion charge to the number of protons and electrons that would
deliver that charge for the ion written?
Select ALL that apply.
Select all that apply
А. 0-2: 8 protons and 4 electrons
B. Na+l: 11 protons and 10 electrons
С. N-3.7 protons and 10 electrons
D. Al 3. 13 protons and 16 electrons
Answer:
Explanation:
O-2 means that there are 2 more electrons than protons. This one is incorrect.
Na + 1 is correct. 11 protons and 10 electrons.
N-3 is correct 7 protons and 10 electrons.
AL+3 is incorrect. It goes the other way 13 protons 10 electrons.
Which of the following redox conditions will produce a spontaneous reaction?
A. The voltage of the reduction half-reaction is negative.
B. The voltage of the reduction half-reaction is positive.
C. The sum of the voltages of the half-reactions is negative.
D. The sum of the voltages of the half-reactions is positive.
Answer:
D. The sum of the voltages of the half reactions is positive.
Explanation:
It's correct on apeex
The statement, that describes the redox conditions will produce a spontaneous reaction is "the sum of the voltages of the half-reactions is positive."
What is spontaneous reaction?A spontaneous reaction is one that favors the creation of products under the conditions of the reaction. It can move in a specific direction without being propelled by an external source of energy. If the standard electrode potential for the redox reaction is positive, the reaction is spontaneous.
If [tex]E^{0}[/tex] (redox reaction) is positive, the reaction will move onward (spontaneous). The redox conditions will cause a spontaneous reaction, and the sum of the half-reaction voltages is positive. Hence the correct option is D.
Learn more about spontaneous reaction here
https://brainly.com/question/13790391
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Which organelle captures sunlight and helps in food synthesis?
Answer:
Chloroplasts! :)
Explanation:
Hope this helps
A mixture consists of 28% oxygen, 14% hydrogen, and 58% nitrogen by volume. A sample of this mixture has a pressure of 4.0 atm in a 9.6 L container at 300 K temperature. This mixture is run through a gas filter, which removes the hydrogen from this system. The gas is placed back into the 9.6 L container. How many moles of gas are left in the container? A) 4.2 mol B) 2.6 mol C) 1.3 mol D) 3.9 mol
Answer:
C) 1.3 mol
Explanation:
Using gas law we can find the initial moles of the sample of the mixture, as follows:
PV = nRT
PV / RT = n
Where P is pressure: 4.0atm
V is volume: 9.6L
R is gas constant: 0.082atmL/molK
T is absolute temperature: 300K
And n are moles of the gas
PV / RT = n
4.0atm*9.6L / 0.082atmL/molK300K = n
n = 1.56moles of the mixture of the gas are present into the 9.6L container
Now, 14% of this gas is hydrogen that was removed of the system, that is:
1.56mol*14% = 0.22 moles of hydrogen are removed.
Thus, moles of gas that remains in the container are:
1.56mol - 0.22mol = 1.34mol.
Right answer is:
C) 1.3 molAnswer:
C = 1.3
Explanation:
I just took the exam and got it right.
boron phosphite
Formula please help fast please please help me please please help
Answer: The formula for boron phosphite is BP
Explanation:
The answer would be BP
Hope this helped!
On hot days, you may have noticed that potato chip bags seem to “inflate”, even though they have not been opened. If I have a 250 mL bag at a temperature of 19 0C, and I leave it in my car which has a temperature of 600 C, what will the new volume of the bag be? will give brainliest
The new volume of the bag : 747.43 ml
Further explanationCharles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
V₁=250 ml
T₁=19+273=292 K
T₂=600+273=873 K
[tex]\tt V_2=\dfrac{V_1.T_2}{T_1}\\\\V_2=\dfrac{250\times 873}{292}\\\\V_2=747.43~ml[/tex]
Write a essay on endangered animals
A: Inquiring and analysing
i. explain and justify the need for a solution to a problem
ii. state and prioritize the main points of research needed to develop a solution to the problem
iii. describe the main features of an existing product that inspires a solution to the problem
iv. present the main findings of relevant research
B: Developing ideas
i. develop a list of success criteria for the solution
ii. present feasible design ideas, which can be correctly interpreted by others
iii. present the chosen design
C: Creating the solution
i. outline a plan, which considers the use of resources and time, sufficient for peers to be able to follow to create the solution
ii. demonstrate excellent technical skills when making the solution
iii. follow the plan to create the solution, which functions as intended
iv. list the changes made to the chosen design and plan when making the solution
D: Evaluating
i. outline simple, relevant testing methods, which generate data, to measure the success of the solution
ii. outline the success of the solution against the design specification
iii. outline how the solution could be improved
iv. outline the impact of the solution on the client/target audience
I WILL IDMEADIITLY MARK U AS BRAINLIESTTT
Answer:
WHATS OOP Lucy???
What is specific heat? How are the factors affecting it?
Answer:
Specific heat, ratio of the quantity of heat required to raise the temperature of a body one degree to that required to raise the temperature of an equal mass of water one degree.
Explanation:
by dividing the heat capacity by the quantity of substance in a body, the resulting specific heat capacity is a function of the structure of the substance itself. In particular, it depends on the number of degrees of freedom that are available to the particles in the substance, each of which type of freedom allows substance particles to store thermal energy.
In the Periodic Table, the vertical columns that extend down the Periodic Table are called
A. periods.
B. Groups.
C: Classes
D: Rows
Answer:
b
Explanation:
What is true about matter in a chemical reaction? *
None of these statements are true.
Matter can be created or destroyed.
Matter can sometimes be created or destroyed.
Matter cannot be created or destroyed.
Answer:
the last option,matter cannot be created or destroyed
Which two of the minerals shown have a metallic luster?
Answer:
A and D
Explanation:
Answer:
A & D
Explanation:
What Phase is water at 120 degrees Celsius?
identify the element present in the following compound zinc chloride
Answer:
Zinc Chloride: ZnCl2
Molar Mass: 136.315 grams per mole
Density: 2.907 grams per cubic centimetre
Melting Point: 563 K (290oC)
Boiling Point: 1005 K (732oC)
Explanation:
Brainliest please?
Weathering, erosion, and deposition act together in a cycle that wears down
and builds up Earth's surface. true or false???
Answer:
The answer is true. Hope this helps
Convert 48.5 grams of water to moles of water
Answer:
2.70 mol of water.
Explanation:
divide the given mass by the molar mass of water. 48.5 / 18.016g = 2.70 mol water.
