Answer:
When fireworks explode in the sky, the gunpowder reactions create a lot of heat, causing the metallic substances pres- ent in the stars to absorb energy from the heat and emit light. ... These electrons absorb energy from the heat, which causes them to move from their original ground-energy state to an excited state.
Explanation:
:))
The process which generates energy in sun and other stars is nuclear fusion. The emission of light energy is thus the result of fusion reaction taking place in stars.
What is nuclear fusion?Nuclear fusion is a chemical process in which two light nuclei or isotopes of an atom fuse together to form a heavy nuclei with the release of million tons of energy.
The process in which a heavy atom breaks into lighter atoms is called nuclear fusion and it is also releasing massive energy but less than the from fusion because, the breaking of chemical bonds needs some energy to absorb.
Fusing two chemical bonds is needs no more energy and it is an energy releasing process. Millions of hydrogen atoms and its isotopes fuse together in several steps and form helium atoms.
This process of release million tons of heat energy and light energy. This will make the stars glow.
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Please help I’m stuck
Answer:
wouldn't it be the #2 because +∆H um I forgot
A bowler lifts her bowling ball a distance of 0.5 meters using 35 joules of energy. If, on Earth, a 1.0 kilogram mass weighs 9.8 newtons, the mass of the bowling ball used by this bowler is about;
Answer:17.5
Explanation: (0.5 meters)(35 Joules) =
When the bowler lifts the bowling ball for a distance of 0.5 m, the mass of the bowling ball used by the bowler is 17.3 kg.
What is Energy?The ability to do work is called Energy.
As work done and energy has the same units. The energy required is equal to the work done.
E = W = 35 J
Force acting on the ball is equal to the weight of the ball.
F = Weight =mg
where m = mass of the bowling ball and g = acceleration due to gravity
Substituting the given energy and distance moved, we have
[tex]35 = m\times9.81\times0.5\\ m=17.3 \:\rm kg[/tex]
Therefore, the mass of the bowling ball is 17.3 kg.
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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
True or False: if chemicals behave in a similar way they are grouped together on the periodic table
Answer:
Explanation: it is true
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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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?
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
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
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
what went wrong with the key
Answer:
omoih
Explanation:
6. An acidic solution of potassium dichromate is mixed with an aqueous solution of
hydrogen peroxide.
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:
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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PLEASE HELP DUE IN 41 MINUTES
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.
How many molecules are in 5.60 L of oxygen gas
Answer:
5.6L of O2 means we have 0.25 moles of O2. and as 1 molecule of O2 has 2 atoms, so, 1.50575*10^23 molecules will have 2*1.50575*10^23 atoms=3.0115*10^23 atoms of O.
hey guys, i found this marble outside and covered in grease. so i took it in to wash it. can you please tell me what it is made of...plz
Answer:
it's probably just a ball of metal
Explanation:
maybe a metal marble.
I need help, please answer
Answer:
it explodes
Explanation:
Answer:
Mrs girl I'm sorry I don't know
I just need the points
when the other girl thicc
Explanation:
let's make this swamp great again
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:
What is correct about solubility of
substances?
Please help! It’s due today. I’ll give brainliest
If a 60 kg object is moving at a velocity of 10 m/s and it's 25 meters high off the ground what would if mechanical energy be?
Answer:
Like all questions in this sublevel, the work done by non-conservative forces must be related to the changes in energy of the object (see Physics Rules section above). In the case of the car skidding to a stop, the kinetic energy equation (see Formula Fix section below) can be used to determine the initial and final kinetic energy of the car. Since the car is on the ground, the height and potential energy can be regarded as zero.
Explanation:
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
PLSSS HELP
How is a balanced chemical reaction, like N2 +
3H2 --> 2NH3, similar to a recipe?
Answer: With each input, there is an output, a recipe requires certain ingredients, and certain amounts of each. A recipe calls for measurements, missing something can ruin it, just like a chemical formula, take something out or add something else, you get something completely different. when putting things together to make something you have to make sure what your putting in, will give you the product you want as the output.
Explanation:
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
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.
HELPPPP MEEEEE I NEED THIS TODAY