Answer:
The Moon’s appearance changes during its orbit around Earth. These changes are called phases.
Explanation:
I don’t know how to do thos
Answer:
75,000,000,000,000,000,000
Explanation:
7.5e+19 (7.5*10^19)
The melting point of chromium is 1890. The melting point of argon is -189. Suggest a reason for this difference.
Answer:
Different forces between atoms and difference in structure.
What happens when the number of particles in an atom is changed
Answer:
When the number of particles, though in this case I think you mean (electrons), changes in an atom....it become an ion. Ions are atoms that were chnaged by losing or gaining an electron. If an atom gains an electron it will have a negative charge. If an atom loses an electron it will have a positive charge. Hope this was helpful!!
Explanation:
Calculate the average atomic mass of a
sample of lead that is 24.1% lead-206
(205.974 amu), 22.1% lead-207 (206.976 amu)
and 53.8% lead 208 (207.977 amu).
Answer: 207.217 amu
Work:
203.973 amu *(0.014) = 2.855 amu
205.974 amu *(0.241) = 49.639 amu
206.976 amu *(0.221) = 45.741 amu
207.977 amu *(0.524) = 108.979 amu
2.855 + 49.639 + 45.741 + 108.979 = 207.217amu
Explanation:
The average atomic mass has been defined to be the total mass given by the relative abundances and masses of the isotopes. The average atomic mass of lead is 204.359 amu.
What is average atomic mass?The average atomic mass has been given by the masses and relative proportions and abundances of the isotopes of the elements that differ from the mass of the element in the periodic table. It is the average mass given by the sum of the masses and the abundances.
Given,
Abundance of lead-206 = 24.1%
The abundance of lead-207 = 22.1%
The abundance of lead-208 = 53.8%
Mass of lead-206 = 205.974 amu
Mass of lead-207 = 206.976 amu
Mass of lead-208 = 207.977 amu
The average atomic mass is given as:
= (205.974 × 0.241) + (206.976 × 0.221) + (207.977 × 0.524)
= 49.639 amu + 45.741 amu + 108.979 amu
= 204.359 amu
Therefore, 204.359 amu is the average atomic mass.
Learn more about average atomic mass, here:
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Is water an element?
a:yes
b:We can't tell from a periodic table
c:No
Answer:
no it is not. The name refers to the chemical formula of water H20 so water is made from elements, but is not itself an element
What is the main type of energy present in a cordless power saw?
Answer:
chemical energy
Explanation:
cordless power saw has rechargeable battery attached to it.
and we know storage energy in battery is chemical hence cordless power saw has chemical energy present in it.
When the saw is operated, the chemical energy is converted into electrical energy which causes the motor fitted in power saw to move.
Thus,
in cordless power saw
chemical energy is converted into electrical energy
electrical energy is converted into mechanical energy.
1)The thermostat on your hot water heater is raised 2 degrees celcius. If your hot water heater holds 400,000g of water, how much heat energy is used up to heat the tank?
2) The temperature of 50g of water was raised to 60c by the addition of 1.5 kJ of heat energy. What was the initial temperature of the water?
3) How much heat is released when 23.00g of water vapor condenses in a cloud to form raindrops?
4) How many joules of heat energy did the sun provide, of a 150 g patch of ice is melted
Explanation:
7erhsigusiskjkurfnkldowustehwoostfsjsozdtshalsoxttensiuxdnslc icy rbkedlxt
Which one of the following is an alkane?
A. C2H4
B. C5H10
C. C3H8
D. C4H6
Hello
Answer:
C. C3H8
Which of the following statements incorrectly describes the assumptions of the kinetic molecular theory? Group of answer choices The particles that make up a substance have differing amounts of kinetic energy. Matter is composed of very small particles. Based on the state of matter a substance is in, it has varying particle arrangement. Particles stop moving completely when they are very cold.
Answer: B- Matter is composed of very small particles.
Explanation:
a. The particles that make up a substance having different amounts of kinetic energy.
b. Matter is composed of very small particles.
c. Based on the state of matter a substance is in, it has varying particle arrangement.
d. Particles stop moving completely when they are very cold.
The assumptions of KMT:
- Molecules are in constant random motion.
- They undergo elastic collisions; other than collisions.
- Particles do not interact with each other.
- The distance between particles is large compared to their size.
A, C, and D all have something similar to the assumptions that I have listed. B is something completely random and unrelated. (As far as KMT goes.)
Please can i have help on these two multiple choice questions.I’ll be so grateful!!!
Answer:
1(neutrons) 2(protons)
Explanation:
How have batteries gotten better over time
Answer:
Yes they have gotten better overtime
Explanation:
2. Predict which food sample you think has the most stored energy
Explain.
Type your answer here.
TT
B 1
IC
Answer:
carbohydrate yam rice
Use the periodic table to select the element that best fits each of the following descriptions. Halogen:
fluorine
scandium
hydrogen
answer is fluorine
Answer: fluorine
Explanation:
Answer:
fluorine on edge 2020
Explanation:
hope this helped:)
Two scientists write a paper detailing their research and conclusions and submit it to a scientific journal. Several
months later, the publisher sends them back the paper. Many comments from several fellow scientists are attached.
Which step will the authors of the paper most likely take next?
They will change their research to a different topic and start all over again
O They will alter the data to match the results that their peers were expecting.
O They will incorporate the suggestions from their peers and resubmit the paper.
They will sue the journal for delaying their research and not printing the paper
Answer:
C
Explanation:
I just took the test
Answer: They will incorporate the suggestions from their peers and resubmit the paper.
Explanation:E 2022
When paper is burned, the mass of the remaining ash is less than the mass of the original paper.
Which statement best explains this result?
0 The ash has less volume than the paper.
O Some of the matter is destroyed during the reaction.
O The mass of the ash cannot be accurately determined.
O Some of the products of the reaction were given off as a gas.
When paper is burned, the mass of the remaining ash is less than the mass of the original paper because Some of the products of the reaction were given off as a gas.
The postulate of the law of conservation of mass is that mass can not be created or destroyed rather it can be transformed from one form to another.
This means that when ash is left behind after burning paper, the total mass should be the same as was obtained before combustion but it rather weighs less than paper itself. This should never be interpreted to mean that mass was "lost".
Here is what happens, paper is an organic material and burning it in air yields CO2 gas which escapes into the atmosphere. This explains why; when paper is burned, the mass of the remaining ash is less than the mass of the original paper.
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electronegativity of argon element
Answer:
argon is 18 2-8-8 since it has octet circle and fully stable you can say it has no electro negativity
Which of the following is a question of morality?
1.beliberately reporting false data.
2.keeping a sloppy record of experimental observations.
3.conducting a drug experiment which will harm lab rats
4. accidentally reporting false data.
Answer:
3
Explanation:
conduct experiment on live animal is not human way so it's a question of morality...
Answer the following question.
Answer:
B) The north and south Poles
Explanation:
when dealing with magnets they have a negative and Positive charge on their south and north poles. Negative attacks with positive and positive with negative so both poles on each magnet should react to each other
Molten steel is poured into molds to make car parts and then allowed to cool and harden. This is an example of –
A. Physical change
B. Physical property
C. Chemical change
D. Chemical property
Answer:
A. Physical Change
Explanation:
Physical change is a type of change in which no new substance is formed, change of state can occur, the appearance of matter can be altered but not its chemical component.
Molten steel being poured into molds to make car parts and then allowed to cool and harden is an example of Physical change because;
- A change of state only occured from molten steel to solid steel.
- No new substance is formed.
which character of Life distinguishes a fire and a flowering plant
Answer:
a flowering plant needs water while a fire doesn't.
That what I guessed???
is this correct please help?
Answer:
[tex]\boxed {\tt Number \ and \ unit}[/tex]
Explanation:
The two requirements for a measurement are a number and a unit.
For example, here is a measurement:
38.6 cm
The number is 38.6 and the unit is cm, or centimeters.
Therefore, both number and unit are correct.
How cab yout knowledge about solutions help improve health or the quality of life? In what practical way can you use your knowledge about it?
Answer:
Here are possible ways to improve health and quality of life:
-Exercise almost everyday
-Be more positive
-Get rid of bad habits
-Start good habits
-Get new things
-Learn New things
Select the reason cities tended to develop at the fall line on rivers.
A student sets up an experiment to test the factors that affect the
solubility of sodium chloride. The student places 5.Og of sodium chloride in
four beakers containing 250 mL of water. The student places each beaker
on a different hot plate and heats them to the following temperatures:
Beaker A: 30°C, Beaker B: 40°C, Beaker C: 50°C, Beaker D: 60°C. In which
beaker would the sodium chloride dissolve at the fastest rate? *
Beaker A
Beaker B
Beaker C
Beaker D
Answer:
Beaker D
Explanation:
Since Sodium Chloride melting point is 1,474°F (801°C) the logical possible answer would be D: 60C.
The explanation that includes scientific principles (key concepts) is the...
A. Claim
B. Evidence
C. Reasoning
Answer:
B. Evidence
Explanation:
the basic unit of matter is know as a(n)
a. atom
b.cell
c. element
d. compound
Answer:
a. atom
Explanation:
Please Help ASAP! View Attached Pictures. I don't understand this.
Answer:
Answers with the explanation.
Explanation:
Surprisingly all of the answers were C for some reason:
14. C (Extensive Properties include mass, volume and length)
15. C (Boiling/Melting/Freezing point are examples of physical change)
16. C (Malleability is how bendable an object is, therefore a physical change)
17. C (For Example, Water only forms Water Vapor when it´s heated up)
Answer:
1.F
2.A
3.C
4.E
5.B
6.D
7.B
8.F
9.A
10.E
11.D
12.C
13.B
14.C
15.C
16.C
17.C
Explanation:
3. An object has a mass of 20.0 grams and a volume of 5.0 cubic centimeters. Give the
density
density= mass/ volume
d= 20/5
d= 4 g/cm^3
The amount of space occupied by an object is its _____.Immersive Reader
a. measurement
b. molecular arrangement
c. volume
d. Option 4
e. length
what do small numbers of 12,22, and 11 stands for in C12H22O11
Answer:
The number of each element in the molecule.
Explanation:
C₁₂H₂₂O₁₁ is one molecule, and it is made 3 elements carbon, hydrogen, and oxygen. There are 12 carbons, 22 hydrogens, and 11 oxygens. If these numbers were different, it would be a different molecule.