Answer:
See explanation
Explanation:
From the statement of the first law of thermodynamics, energy is neither created nor destroyed, but is transformed from one form to another.
Thermal energy is possessed by the hot air while the fire is burning. This thermal energy was obtained from the chemical energy stored in carbohydrates(cellulose) that is present in wood material. As the combustion proceeds, chemical energy stored in chemical bonds of the wood material converts into thermal energy (heat energy). The chemical reaction involved in the combustion of wood can be simplified as shown below; n represents the number of glucose units that combine to make up the cellulose present in the wood material.
nC6H12O6(s) + 6nO2(g) ===> 6nCO2(g) + 6nH2O(g)
n may even be as much as thousands of glucose units.
If a 200 g sample of Radon-220 has a half-life of 55 seconds. How much material is left after
220 seconds?
A 12.5 g
B) 25 g
c) 55 g
D) 100 g
The answer is B 12.5g
density is
A) the amount of mass in an object
B) the amount of mass in a given amount of space
C) the amount of space an object takes up
D) the weight of an object
Answer:
A)
Explanation:
the the amount of mass in the object
Answer:
b
Explanation:
Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).
Virtual Classifying Elements on the Period Name the three general categories into which the elements are divided. 3
Answer:
kgtπ橆§π©gu6gt7
Explanation:
Helppp plzzz
What can be accurately said about
Earth's continents?
Write the hyphen notation for the element that contains 15 electrons and 15 neutrons. 1. Copper-60 2. Oxygen-15 3. Phosphorus-30 4. Sulfur-31 5. Silicon-30 6. Zinc-60 7. Phosphorus-31 8. Fluorine-15
Answer:
Phosphorus-30
Explanation:
In hyphen notation, the mass number is written after the name of the element. An element that has 15 electrons and 15 neutrons would also contain 15 protons. Since the mass number of an element is the sum of the protons and neutrons in an atom of that element, the mass number of this element is 30.
Also, the number of protons (or electrons for a neutral atom) present in an atom of that element is known as the atomic number of that element.
In the periodic table of elements, the element with atomic number 15 is phosphorus. Thus, phosphorus has 15 protons, 15 electrons and 15 neutrons. Its mass number = 30. In hyphen notation, it is written as: Phosphorus-30
How does Astronomy work
Answer:
An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either observational (by analyzing the data) or theoretical astronomy.
Recommendation:
Please mark it BrainliestOnce atoms have achieved a full outer shell they have the electron configuration of what family?
will mark brainliest
Answer:
At some point in your chemistry education, you may have been introduced to the song “The Elements,” in which Tom Lehrer does a rapid-fire musical rendition of all the elements' names. Like me, you may even have been offered the opportunity to memorize this song for extra credit. If so, it’s possible that you still remember the names of all the elements, which is an impressive feat—not to mention a fun trick to pull out at parties.
Explanation:
Answer:
atoms tend to achieve the electron configuration of a noble gas which is a full outer level of 8 electrons
help please thank u!!!
The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supported by this observation?
Energy is released when an electron moves to a higher energy level.
Smaller atoms have fewer spectral lines than larger atoms.
The energy of an electron increases with distance from the nucleus.
Electrons cannot exist in locations other than in specific orbits.
Answer:
d. Electrons cannot exist in location other than specific orbits.
The U.S. Military provides personnel on deployment with fuel bars to heat up their meals. A fuel bar provides 380.0 kJ of energy, and 73% of that energy can be transferred to food. How many ounces of water could be heated by one fuel bar to brew coffee in the field? The initial temperature of the water is 16.0°C and it needs to be heated to boiling at 100.0°C.
Answer:
Explanation:
380 x 10³ J
73% of 380 x 10³ = 277.4 x 10³ J
mass of water = m gram
heat used to boil water = m x 4.2 x ( 100 - 16 )
= 352.8 m = 277.4 x 10³
m = 786.3 g
1 gram = .0352 ounce
786.3 gram = 786.3 x .0352 ounce
= 27.68 ounce .
What are derived units? Give an example
Scientists can identify an element by looking at the structure of a single
Answer:enzyme
Did i help you if so leave a thanks if not...than i will better try to explain the anwser or look into it a bit more to get the correct one.
A nuclear fission reaction produces more energy than a nuclear fusion reaction.
True or false
Answer:
true
Explanation:
An object weighing 89.7 g is
placed in a graduated cylinder
displacing the volume from
50.0 mL to 60.5 mL.
What is its density in g/cm3?
[?] g/cm3
Answer:
The answer is 8.54 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
volume = final volume of water - initial volume of water
volume = 60.5 - 50 = 10.5 mL = 10.5 cm³
We have
[tex]density = \frac{89.7}{10.5} \\ = 8.5428571...[/tex]
We have the final answer as
8.54 g/cm³Hope this helps you
Read the statement and identify whether it is a Chemical Change, Physical Change, or Both. Answer the following questions Chemical (A), Physical (B) or Both (C).
Eating and digesting cheese pizza.
Explanation:
Eating and digesting cheese pizza is a Chemical Change because it is an irreversible reaction. It can't be undone.
Which correctly lists three forms of frozen water?
dew, frost, rain
frost, hail, sleet
hail, rain, sleet
rain, dew, frost
Answer:
frost, hail, sleet
Explanation:
Answer:
its the second answer
Explanation:
how is leachate formed in phytoextraction?
Answer:
As precipitation percolates though decomposing organic waste (Justin and Zupancic, 2009), leachate is produced. ... Phytoremediation systems are used in constructed wetland treatment systems to detoxify, degrade, and inactivate potentially toxic elements in leachate (Jones et al., 2006)Explanation:
[tex]hii[/tex]have a nice day ✌️✌️Answer:
i think its used much by humans but they don't know it harmfull to humans
Why is so much energy produced through fusion and fission reactions?
Answer:
there is a ton of heat being produced
Explanation:
more heat more energy
When calcium carbonate is heated ,two new substances, calcium oxide and carbon dioxide are formed a)write a word equation for the above chemical reaction b)is calcium carbonate an element or a compound ?Explain
Answer:
Explanation:
When calcium carbonate is heated the new substances formed will be Calcium oxide and carbon dioxide
(a)
[tex]CaCO3 + heat[/tex]→[tex]CaO+ CO2[/tex]
[tex]Calcium carbonate + heat[/tex]→[tex]Calcium oxide +Carbon dioxide[/tex]
(b)
Elements are pure substances made up of the same atoms such as Ca, C, etc.
Compound are formed when two or more different types of elements are bonded together. like Calcium carbonate in this case
hence, [tex]CaCO3[/tex] is a compound
Select the correct answer.
Kylie places a cube of metal A and a cube of metal B in two separate beakers of water. Then she heats the beakers. She keeps the mass of metal, the amount of water, and the amount of heat the same. At the end of her experiment, she finds that metal A has a lower temperature than metal B. What can she conclude about the thermal properties of the two metals?
Metal B is a better conductor than metal A.
Metal A is a better conductor than metal B.
Metal A has a higher heat capacity than metal B.
Metal B has a higher heat capacity than metal A.
Answer:
Metal A has a higher heat capacity than Metal B.
Explanation:
To answer this question, we have to think about what happened and what we know about thermal properties of metals. We are talking about temperature and heat in this question, so we can already eliminate both answers that talk about the metals being a conductor, because conductivity is related to electricity. That's not what the question asks. So therefore, we know one metal must have a higher heat capacity than the other. Heat capacity is defined as the number of heat units needed to raise temperature by one degree. If metal A has a lower temperature than metal B, it must have a higher heat capacity, because it takes more heat to raise the temperature. This is because metal B has a higher temperature than metal A. Therefore, the correct answer is Metal A has a higher heat capacity than Metal B.
What happens when the chemicals inside an instant cold pack mix together
A.the mixture inside the pack gives off coldness
B.the mixture generates static electricity
C.the mixture absorbs thermal energy from the surroundings
D.the mixture releases thermal energy into the surroundings.
Answer:
the answer is C
Explanation:
there is no such thing as COLD exept absolute ZERO. anything that feels COLD, perse, is just tranfering your thermal energy into it, since it is lacking that energy
When the chemicals inside an instant cold pack mix together then the mixture absorbs thermal energy from the surroundings.
How heat is flow?Heat always flow from hot body to cold body in order to maintain the equilibrium between two bodies.
So when the chemicals inside an instant cold pack mix together then they will absorbs heat in the form of thermal energy from the surronding as they are in cool temperature and will not able to give off heat.
Hence absorption of thermal energy from the surrounding takes place.
To know more about heat flow, visit the below link:
https://brainly.com/question/13439286
#SPJ2
1. Explain the evidence which suggests that the universe is expanding. 2. What is the Big Bang Theory and what does it propose? 3. In addition to evidence, which suggests that the universe is expanding, what other evidence supports the Big Bang Theory?
Answer:
1) The evidence that the universe is expanding can be explained by the observed redshifted light from distant galaxies which according to the evaluation means that the galaxies are in recession. The observation was explained by Hubble's law which stated that the rate of recession of the galaxies from the Earth is proportional to their away distance
2) The Big Bang Theory is a theory that scientists used to explain the origin of the universe. According to the big bang theory states that the universe started from an extremely high temperature and high density singular state that exploded and expanded over time to the the present day universe
3) Another evidence that supports the Big Bang Theory is the cosmic background radiation which is has its origin from the Big Bang
Explanation:
Which compound would you expect to have greater surface tension, acetone [(CH3)2CO] or water (H20)? Explain.
es)
A)
Acetone. This molecule has more instances of hydrogen bonding then
water
B)
Water. Surface tension increases with increasing intermolecular forces, and
water can hydrogen bond while acetone cannot.
Acetone. Surface tension increases with increasing intermolecular forces.
They both can hydrogen bond but acetone molecules are larger creating
stronger London dispersion forces.
Water. Surface tension increases with increasing intermolecular forces.
They both can hydrogen bond but water molecules due to their shape, can
pack more tightly and stick together easier.
D
Surface tension increases by increasing the intermolecular forces.
The following information should be considered:
In the compounds water contains the hydrogen bonding interactions along with dispersion forces.These hydrogen bonding interactions are not seen in the acetone which has only dispersionSo, water has the greater surface tension as compared to acetone.Learn more: https://brainly.com/question/2386757?referrer=searchResults
Help me please will give brainliest!!!
Answer:
Element A and element D
Please make me brainliest!!
What happens to the mass of a substance during a chemical reaction?
Answer: In a chemical reaction the total mass of all the substances taking part in the reaction remains the same.
Why does the periodic table continue to expand?
Answer: Because new elements are being discovered
Explanation:
calories
Nutrition Facts
1. How many calories are in one serving of this food? (Remember, all
the numbers on a nutrition fact label are for 1 serving of the food)
|
2. In one serving of this food, how many calories are from fat?
Serving Size 1/2 cup (about 829)
Servings Per Container B
Amount Per Serving
Calories 200 calories from Fat 130
Daily Value
Total Fat 149
22%
Saturated Fat 99
45%
Trans Fat og
Cholesterol 5mg
18%
Sodium 40mg
2%
Total Carbohydrate 173
6%
Dietary Fiber 10
4%
Sugars 149
Protein 3g
3. If you consumed the entire container of this food, how many
calories would you consume?
4. If you consumed the entire container of this food, how many
calories from fat would you consume?
Vitamin A 10% • Vitamin C 0%
Calcium 10% Iron 6%
Dalya alone
Song
Tea
20
25
7
Total Care
Page 1 of 10
What is precipitation?
the sweat from our bodies on hot days
the gas that we use in furnaces and ovens
any form of water that falls from the sky
warm rain, but not cold snow or sleet
Answer:
C!
Explanation:
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity from clouds. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hail.
Answer:Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail. It is the primary connection in the water cycle that provides for the delivery of atmospheric water to the Earth. Most precipitation falls as rain. Precipitation isn't always in the form of warm liquid. It also includes snow ,sleet ,hail ,and such.
Did this help? If so please leave a thanks! (:
what are all of the man made elements
Answer:
technetium,promethium,polonium.and astatine
Explanation:
Please answer today ASAP I need a answer