Answer:
D
Explanation:
i took the test
A reaction which is exothermic and results in an increase in the entropy of the system is said to be always spontaneous. A spontaneous reaction is one that produces heat. The correct option is D.
What is a spontaneous reaction?A process which has an urge or a natural tendency to occur under a given set of conditions is defined as the spontaneous process. Some of the spontaneous process need no initiation, they take by themselves. Dissolution of common salt in water, evaporation, etc. are examples.
Almost all spontaneous process are found to be exothermic. They release heat and warm up their surroundings. These reactions move towards the equilibrium with no need for an energy input from an external source.
Gibbs free energy is an important parameter to determine the spontaneity of a reaction. If the value of ΔG is negative, then the reaction will be spontaneous.
Thus the correct option is D.
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HELP! A 25-mL solution of 2.0 M hydrobromic acid is kept in a bottle. How many moles of the acid is in the solution?
Answer: hello mason
Explanation: figure it out yourself
Did the argon change state as you heated the atoms?
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. Solids, liquids and gases all expand when heat is added. When heat leaves all substances, the molecules vibrate slower. So yes, it can if the heat is strong enough to change the objects compesistion! :)
Argon is a noble gas. It always exists in the form of gas. The boiling point of argon is very higher and thus we cant change its state, by simply heating.
What is argon ?Argon is 18th element in periodic table. It has 18 electrons and 18 protons. The mass number of argon is around 36 g/mol. Argon is included in the group 18 called the noble gases.
All the noble gases are highly stable and they are not reactive at normal conditions. They cant be easily form compounds or change their state by excitation or photochemical reaction.
Argon has higher melting point and boiling point. It cannot be easily transformed to another state by simply heating. But there occurs electron excitation, where the phase change cannot occurs.
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Due tonight! Please help!
Please show your work and don’t spam or delete answers
I will mark Brainliest!
Calculate the concentration in grams per liter of a 450.0 mL solution containing
0.0762 moles of iodine gas (I2)
Answer:
42.98 g/L
Explanation:
A teacher performed a demonstration of a chemical reaction by stretching a ballon containing Sodium bicarbonate (baking soda) over the top of a flask containing acetic acid (vinegar). When the sodium bicarbonate was added to the acetic acids the ballon began to inflate shown I'm the figure.
What will the total mass of the flask, the ballon, and products be after the reaction?
A. Less than 100g, because some of the solid baking soda disappears
B. 100g, because all of the atoms of the reactants remain in the flask
C. Less than 100g, because the gas has less mass than the solids and liquids
D. 100g, because the volume of gas inside the balloon has increased
Explanation:
D. 100g, because the volume of gas inside the balloon has increased
In chemical reactions that occurs in closed systems, the amount of matter is conserved. The total mass of the system is conserved because the gas did not escape and the volume has increased,
Answer:
d
Explanation:
Hi! I'm doing homework about covalent bonds in Chemistry and I am supposed to figure out which 3 are right and which 3 are wrong. I'm having a really hard time. Any help is appreciated!
Answer:1,5,4
Explanation:
What are uses of metals??
Instructions:
1. Do not give the invalid answer.
2. I want full correct answer with full explanations.
Answer:
Different uses of Metals
Metals are usually very strong, most durable and highly resistant to everyday wear and tear. As such, they have been used since ancient times for a lot of things. And even today with advances in technology and a lot of other things the uses of metals have broadened greatly. Metals even play a key role in the economy. Let’s look at some important and popular metals uses.
In the Construction Industry
In electronics
In medicine
Machinery, Refractory and Automobiles
Decorative products
Other Uses
In the Construction Industry
Metals are the main component in the construction industry. Metals like iron, steel amongst others are the main materials used in construction of buildings and even homes.
In Electronics
Another important application of metals are in electronics. As metals are good conductors of electricity, they are used to making wires and parts for equipments and gadgets that function on electrical current. Popular examples include, TV, mobiles, fridge, iron, computers etc.
In medicine
If you are wondering how, well from a biological perspective metals are found as micro-elements in our bodies. Besides, the presence of metal elements is crucial for several functions like transmission of nerve impulses, oxygen flow, reaction between enzymes etc. Some medicines are therefore liaised with metal compounds to treat certain deficiencies or sickness. Metals like, iron, calcium, magnesium, potassium titanium, and aluminum are used commonly in medicine in the form of antacids.
Apart from this, most of the equipments and tools used are made from metals.
Machinery, Refractory and Automobiles
This is one of the most common use of metals. They are used extensively in manufacturing machines for industries, agriculture or farming and automobiles which include road vehicles, railways, airplanes, rockets etc. Here, the commonly used metals are iron, aluminum and steel.
Besides these, most of the utensils that is used in the kitchen are made from metals like steel, aluminum, and copper. Due to a high temperature withstanding nature metals are preferred the most.
Decorative products
Metals such as platinum, gold, and silver come under the category of precious metals and have high economical value. These metals are widely used in making jewellery sets or for some decorative piece.
Other Uses of Metals
Some other uses and applications of metals are, they play an important role in security as the metals are used in making locks, strong safe, doors etc. Apart from this, furnitures are made from metal these days. Metals also find their uses in the military where they are used to manufacturing weapons and ammunitions. Some metals are used in galvanizing to protect from rusting.
These are some popular uses of metal. To know more about metals, different types, properties of metals and more you can keep visiting BYJU’S or you can also download our app for interesting content and learning experience
In a solution, the substance that has been dissolved is called the...
Answer:
solute
Explanation:
The substance being dissolved is called a solute. The thing the solute is being dissolved in is called a solvent.
HELPPPP MEEEEE I NEED THIS TODAY
What is correct about solubility of
substances?
I need help, please answer
Answer:
it explodes
Explanation:
Answer:
Mrs girl I'm sorry I don't know
I just need the points
What is the molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution?
Answer:
D
Explanation:
all ya got to do is divide the moles from the solution... so 3.0 divided by 0.25. put it in a calculator
hope this helps
The molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution is 12M.
What is Molarity?Molarity of a given solution is known as the total number of moles of solute per litre of the solution. A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
The unit of molarity is mol L⁻¹.
Molarity is temperature dependent because as temperature changes, volume of the solution also changes.
Given,
3.0 moles of Saline (NaCl)
Volume of solution = 0.25L
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
Molarity = 3 ÷ 0.25 = 12 M
Therefore, The molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution is 12M.
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6. An acidic solution of potassium dichromate is mixed with an aqueous solution of
hydrogen peroxide.
Consider the following reaction:
2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g)
At STP, what is the total volume of CO2 formed when 6.0 liters of C2H6 are combusted?
4 L
24 L
12 L
6 L
Answer:
4L
Explanation:
The first thing to do here is make sure that you have a balanced chemical equation. The equation given to you is actually unbalanced, so focus on writing a balanced version
2
C
2
H
6(g]
+
7
O
2(g]
→
4
CO
2(g]
+
6
H
2
O
(g]
Now, the problem provides you with a mass of ethane,
C
2
H
6
, and asks for the volume of carbon dioxide,
CO
2
, formed by the reaction at STP, Standard Temperature and Pressure.
As you know, STP conditions are defined as a temperature of
0
∘
C
and a pressure of
100 kPa
. Under these specific conditions, one mole of any ideal gas occupies exactly
22.7 L
- this is known as the molar volume of a gas at STP.
So, what this means is that if you know how many moles of carbon dioxide are produced by the reaction, you can use the molar volume of the gas to find the requested volume.
Use the molar mass of ethane to determine how many moles you'd get in that
240.0-g
sample
240.0
g
⋅
1 mole C
2
H
6
30.07
g
=
7.9814 moles C
2
H
6
Now, notice that you have a
2
:
4
mole ratio between ethane and carbon dioxide. Since ethane reacts with excess oxygen, you can assume that all the moles will take part in the reaction.
This means that the reaction will produce
7.9814
moles C
2
H
6
⋅
4
moles CO
2
2
moles C
2
H
6
=
15.9628 moles CO
2
So, if one mole of any ideal gas occupies
22.7 L
at STP, this many moles will occupy
15.9628
moles CO
2
⋅
22.7 L
1
mole CO
2
=
362.4 L
The answer is rounded to four sig figs, the number of sig figs you have for the mass of ethane.
What are the main properties of any liquid? Explain how you can measure the volume of a liquid sample.
Answer:
Liquid has the following properties -
- Liquids are almost incompressible due to the fact that molecules do not have a lot of space between them so they can not be compressed.
- Liquids have a fixed volume but shape varies according to the container it is placed in. It changes the shape even the volume is the same.
- Liquids flow from higher to lower levels.
- Liquids have their boiling points above room temperature, under normal conditions.
Measure the volume of a liquid sample-
The volume of the liquid can find out by dividing the mass of the liquid by the density of the liquid. D = m/v. The density of water is 1 gram/cubic centimeter.
Will mark branliest!! and 50 points for right answer!
1. which solvent resulted in the best separation of ink? oil or alcohol
2. which marker had a red spot or streak with an Rf value of approximately 0.82? Maker 1, 2, 3, or none?
3. which spot has the lowest rf value in the marker 3s chromatogram? yellow or purple?
4. which marker had a yellow spot with an rf value of approximately 0.60? Marker 1,2,3 or none?
Answer:
Alcohol, 0.63 I don't know the rest the rest
Explanation:
Answer:
Explanation:
1. Alcohol
2. Marker 1
3. Purple
4. Marker 2
Filling out the lab paper gives you the answers. These were all correct.
What is the meaning of democracy
Answer:
a system of government by the whole population or all the eligible members of a state, typically through elected representatives. its like everyone has a choiceExplanation:
Answer:
Demorcay is:The form of government of the entire population or of all qualifying members of the state, generally by elected representatives:
Explanation:
A magnet can pull the iron filings out of a mixture of sand and iron
filings.
TRUE
FALSE
Answer:
this is true
Explanation:
because the sand is left behind for it isn't magnetic
Why a hot cup if water has more thermal energy than a cold cup of water?
Answer:
The hotter the substance, the more its molecules vibrate, and therefore the higher thermal energy
:)
Answer: Hot water has more thermal energy because the particles are farther apart thus they are moving faster. As particles move faster their thermal energy increases.
Explanation: Look in answer
what went wrong with the key
Answer:
omoih
Explanation:
А
B
с
21. Which picture shows an irregular galaxy?
A. Image A B. Image B C. Image C
D. None of the abc
22. Alhich picture shows a spiral galaxy?
how many helium atoms are in a mole of helium?
Answer:1 mole of helium gas contains 6.02 x1023 helium atoms
Explanation:I hope this helps
Is a blender (at home) an example of electrical to mechanical energy? If so, why? Please explain thoroughly
Answer:
Yes it is
Explanation:
You use electricity to power the blender itself, then after you power it the potential energy becomes kinetic energy which equals mechanical energy in the blender. So yes, a blender is an example of electrical to mechanical energy.
Really need help!! Don’t understand:( 40 points
If 100.0g of nitrogen gas (N2) is reacted with 100.0g of hydrogen gas (H2) what is the limiting and excess reactants?
Hint: convert grams to moles for each reactant and then convert to moles of NH3. You need your balanced equation from answer 1 to determine the mole relationship between each reactant and the product NH3. Use the periodic table to determine the molar mass of all chemical formulas. Fill in the “?” Blanks below to show your work.
Please please please fill in the blanks...
Molar mass of H2= ____ g/mol
100.0g H2 • 1 mol H2/? g H2 • ? Mol NH3/ ? Mol H2 = ? Mol NH3
Molar mass of N2= ? g/mol
100.0g N2 • 1 mol N2/ ? g N2 • ? Mol NH3/ ? Mole N2 = ? Mol NH3
Molar mass of NH3 = ? g/mol
100.0g N2 • 1 mol N2/ ? g N2 • ? Mol NH3/ ? Mol N2 • ? g NH3/ 1 mole NH3 = g NH3
Pretty please help me :( PWEAASEEEEEEE
True or False: if chemicals behave in a similar way they are grouped together on the periodic table
Answer:
Explanation: it is true
Please Help!
How is a pure sample of cobalt obtained
Are humans more similar to trees or bacteria? How do you know?(1 point)
A
Humans are more similar to bacteria because trees cannot move around their environment.
B
Humans are more similar to trees because bacteria are too small to see.
C
Humans are not similar to trees or bacteria. Humans are a special species that is not related to any other species on Earth.
D
Humans are more similar to trees because all plants and animals are part of the same domain.
Answer:
a
Explanation:
Answer:
Option D
Explanation:
A and B both make sense to some level.
For option A,trees can only move while bacteria and humans can both move and locomote so there's that similarity
For option B,humans and plants are not micro organisms but bacteria are so there's that similarity
Option C is just not true
Option D is the right answer thus both humans and animals are eukaryotes
What is in with those numbers? H2O?
Answer:
hydrogen atom and oxygen atom
Please help! It’s due today. I’ll give brainliest
are absolute temperature and kelvin temperature scale the same thing
Answer:
No they are not the same..
Explanation:
Absolute temperature is the temperature of an object on a scale where 0 is in the lowest possible energy state while the kelvin is a base unit of temperature.
Where are most algae found?
on the surface of lakes
growing on the ocean bottoms
floating on water world-wide
in forests around the world
Answer:
on the surface of lakes
Explanation: