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:
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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 it.
Answer:The answer is B. The air molecules of warm air have high energy and therefore collide with high energy. This causes them to move away from each other with increased temperatures. This is another reason why heating air in a closed container results to high pressure with increased heating.
Explanation:
Transcription of the sequence TTA AGC produces which sequence?
AAT UCG
AAT TGC
UUT TCC
AAU UCG
Answer:
AAU UCG
Explanation:
According to the base-pairing rule, the purine bases always pair with the pyrimidine bases. More specifically, Adenine always pairs with Thymine/Uracil while Guanine always pairs with Cytosine.
T - A
T - A
A - U
A - U
G - C
C - G
Hence, the transcription of the sequence TTA AGC will produce AAU UCG.
3. Two substances, both liquids, start at the same temperature. You transfer
the same amount of energy out of both liquids, but substance 1 becomes a
solid before substance 2. Which substalice has a stronger molecular
attraction?
A Substance 1
B Substance 2
Pleas help I will give you Brainlyest
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
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.
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.
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:
How does the ionosphere help radio transmission?
Explanation:
ionosphere can reflect radio waves directed into the sky back toward the Earth
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.
can u answer all of em
Answer:
one is across
Explanation:
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 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
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Convert 2.5x10^6mm to km
Answer:
2.5 kilometers
Explanation:
Which organelle captures sunlight and helps in food synthesis?
Answer:
Chloroplasts! :)
Explanation:
Hope this helps
A solution has a density of 1.50 g/mL. How many grams are needed to obtain 10.0 mL of solution?
Answer:
15 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 1.5 × 10
We have the final answer as
15 gHope this helps you
The atmosphere insulates the planet by trapping in
The chemical equation S + 02 - S02 is an example of which type of reaction?
Single displacement
Combination
Double displacement
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???
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
1. ice cream melting
Is the change physical or chemical?
Why do you thinks so? (2-3 reasons/indicators)
Answer:
Physical.
Explanation:
It is not becoming or making a new substance.
Answer:
Physical
Explanation:
Nothing is being added or removed from the substance. You can freeze the ice cream again, returning it to its solid state. There is no change to the ice cream itself.
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
moon are near
5.
pulls all objects in the universe, including the
moon and Earth and the sun and Earth, toward each other.
Answer:
gravity
Explanation:
Gravity holds the universe together and is a force exerted by any object with mass.
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
What Phase is water at 120 degrees Celsius?
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]
I 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
What is the answer to part c and how do we do it?
Answer:
The answer to part c is the amount of moles of FeBr₃ that will be formed is approximately 0.179 moles
Explanation:
The given chemical reaction is 2Fe + Br₂ → 2FeBr₃
The mass of iron, Fe, in the reaction = 10 g
a) The amount of moles of iron that reacted = The mass of iron in the reaction/(The molar mass of iron)
The atomic mass of iron = 56 amu
Therefore, one mole of iron = 56 grams
The amount of moles of iron that reacted = 10/(56) ≈ 0.179
The amount of moles of iron that reacted ≈ 0.179 moles
b) The amount of moles of bromine that reacted = 3/2 × The amount of moles of iron that reacted
∴ The amount of moles of bromine that reacted = 3/2 × 0.179 ≈ 0.2685
The amount of moles of bromine that reacted ≈ 0.2685 moles
c) The amount of moles of FeBr₃ that will be formed = The amount of moles of iron in the reaction ≈ 0.179 moles
d) The mass of one molecule of FeBr₃ = Mass of 1 atom of iron, Fe + 3 × The mass of 1 atom of bromine, Br
∴ The mass of one mole of FeBr₃ = 56 + 3 × 80 = 296
The mass of one mole of FeBr₃ = The molar mass of FeBr₃ = 296 grams
The mass of FeBr₃ formed = The molar mass of FeBr₃ × The number of moles of FeBr₃ formed
∴ The mass of FeBr₃ formed = 296 × 0.179 ≈ 52.984
The mass of FeBr₃ formed ≈ 52.984 grams
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 mLIn 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:
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HELP PLEASE!! What is the UNabbreviated electron configuration for Na and Ar
Answer:
Na 1s2 2s2 2p6 3s1
Ar 1s2 2s2 2p6 3s2 3p6
Explanation:
