Which statement best describes what a circle graph shows?
A. A frequency distribution
B. Data as proportions of a whole
C. The average of a data set
D. The relationship between two variables
Obi is trying to determine if a powdery, solid substance is an element or a compound. After recording some observations, he strongly heats a sample of the solid over a burner flame. After fifteen minutes, he turns off the flame and allows the sample to cool. He records his final observations in the data table.
A 3-column table with 3 rows. The first column labeled observation has entries appearance, mass (g), chemical reaction with weak acid. The second column labeled original sample has entries white solid, 100.0, bubbles. The third column labeled sample after heating has entries white solid, 56.0, no bubbles.
Which is the best explanation of his results?
A. The heating changed some of the sample to gas, causing the mass to decrease without breaking down the sample. Therefore, the original sample is a compound.
B. The appearance stayed the same, showing that the sample was not broken down by heating. Therefore, the original substance is an element.
C. The mass decreased during heating and some of the impurities escaped. Therefore, the original substance is an element.
D. The chemical reaction with acid changed, showing that the sample was broken down by heating. Therefore, the original substance is a compound.
An element consists of one type of atom and cannot be broken into simpler substances through simple chemical processes
The correct option is option D
D. The chemical reaction with acid changed, showing that the sample was broken down by heating. Therefore, the original substance is a compound
The reason why option D is correct is as follows:
The given table is presented as follows;
[tex]\begin{array}{|l|l|l|}\mathbf{Observation}&\mathbf{Original \ Sample}&\mathbf{Sample \ After \ Heating}\\Appearance&White \ solid&White \ solid\\Mass&100 \, g&56 \, g\\Chemical \ reaction \ with \ acid&Bubbles&No \ bubbles\end{array}\right][/tex]
Given that the changes after heating includes lack of visible reaction with the weak acid, and a significant change in mass, therefore;
The original substance was broken down by heat resulting in a new substance that has different chemical properties. An element cannot be broken down into simpler substances. Therefore, the substance is a compound
The correct option is option D
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What is the formula name!!
I will give brainliest !!…
Answer:
I think this is the formula CH₃COOH.
Explanation:
SCIENCE!! i need help on the question in the middle please!!!
Which property describes a mixture? It cannot be separated by physical methods. It has a single chemical composition. It cannot have more than one state of matter. It cannot be described by a chemical symbol or formula.
Answer:
it cannot be separated by physical methods
Explanation:
The mixture is not separated from the physical methods. Thus, option A is correct.
A mixture has been the combination of two or more substances. It has been described as a homogeneous solution.
The constituents in the mixture are indispensable. The mixture is generally homogeneous, however, heterogeneous mixtures have been possible with the substances being separated.
The mixtures have a different chemical composition and are not separated from the physical methods. Thus, option A is correct.
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What element is this? Ignore my answer choice.
Answer:
Aluminum
Explanation:
It is your choice because only aluminum has 13 protons
Answer:
yea its aluminum the 13 element because of its 13 protons
The data table shows the number of pumpkin seeds that germinate at different temperatures. What is the median number of seeds that germinate at 32ºC?
A. 64
B. 65.5
C. 65
D. 66
Answer: I agree with the other person it's B
The woman riding the bike applies a force by pedaling the bike. However, she moves at a constant velocity. So her force must be balanced by another force. What force acts to balance her forward force?
Frictional Force is the one and only.
WILL GIVE BRAINLIEST
List three examples of where potential energy is transformed to kinetic energy in the Rube Goldberg Machine simulation. Fully explain the energy transformations using complete sentences. (Example: The ball has potential energy when it sits on the shelf that transforms to kinetic energy when it falls to the ground.)
DO NOT COPY AND PAST THE ANSWER FROM 2018 AND IF YOU HAVE A QUSTOIN ABOUT IT ASK UNDER THE QUSTION DO NOT ANSWER IT TO ASK A QUSTION
Answer:
1. The ball will have potential energy at the top of the mountain, when the ball falls the ball will have kinetic energy .
2. The roller coaster has potential energy when stopped on the very top, therefore it releases kinetic energy when it falls down the rollercoaster.
3. The car on the hill had potential energy weather when it went down it had kinetic energy.
Explanation:
Sorry it took forever I had to think lol..
Answer:
ok lol
im bored
Explanation:
Which statement correctly describes the location and charge of a proton in an atom? A. The protons are inside the nucleus with a negative charge. B. The protons are inside the nucleus with a positive charge C. The protons are outside the nucleus with a negative charge. D. The protons are outside the nucleus with a positive charge.
Answer:
The correct answer is B
Explanation:
Where does the force come from when a bumper car changes speed?
Answer:
Newton's second law
Explanation:
The rate of change of momentum of an object is equal to the net force acting on it. When bumper cars collide they push on each other. These pushes cause the momentum of each car to change.
The engine............
Match the atomic particles with their characteristics.
1. made of two protons and two neutrons
2. similar to an electron; positive charge
3. orbits nucleus; negative charge
4. bundle of energy; zero charge
5. found in nucleus; positive charge
6. very unstable; +, -, or zero charge
7. found in nucleus; zero charge
8. negative particle; negative charge
9. atomic energy converted to mass
Words to match to:
alpha
electron
positron
neutrino
proton
beta
gamma
neutron
meson
The atomic particles of which some are present in atom with their characteristics are given in serial order:Alpha 2.positron 3.electron 4.neutrino 5.proton 6.meson 7.neutron 8.beta 9.gamma.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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How were the novae on Venus similar to the landforms in Gerya’s computer model?
Answer:
Explanation:
The model results matched the novae on Venus. This provided evidence that Gerya's idea that a thinner crust and higher surface temperature might allow melted rock to push up toward the surface, forming novae.
What is the relationship between Potential energy and Kinetic energy in a system?
its not chemistry ik
i will mark
A student combined equal amounts of two solutions. One solution had a pH of 2 and the other had a pH of 12. Which would most likely be the resulting pH? 1 3 6 11
Answer:
6
Explanation:
Answer:
6
Explanation:
Which description of salt is a physical property?
A. No combustion
B. Makes ionic bonds
C. Product of mixing acids and bases
D. Solid does not conduct electricity
Answer: it was in the lesson, the answer is it is solid and does not conduct electricity
Explanation:
Physical Properties Chemical Properties
White cubic crystals Do not undergo combustion
Odorless, salty taste Make ionic bonds easily
As solids, they do not conduct electricity The product of mixing acids and bases
2. When the child is pushed in the toy car, he increases speed. Does he accelerate as he is being pushed?
Which subatomic particles change the mass number? (select all that apply) Protons Neutrons Electrons
Answer:
protons and neutrons pretty sure
Explanation:
The height of a coffee mug would be about:
a 500 mm
b 20 cm
c 1 km
d 8 cm
What is the chemical symbol for table salt?
Answer: NaCI
Explanation:
Answer: NaCl
Sodium chloride , commonly known as salt (although sea salt also contains other chemical salts), is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.
You are looking at two samples of iron. One sample is very small and came from the red soil on the planet Mars. The other sample is very large and came from Earth's core. True or False, these two samples contain different atoms
I need help ASAP! 10 points!
Answer:
The answer to this question is ( a )
Explanation:
What causes objects to move or stay still?
Claim
Reasoning:
Evidence:
Answer:
For an object to move, there must be a force. A force is a push or pull that causes an object to move, change direction, change speed, or stop. Without a force, an object that is moving will continue to move and an object at rest will remain at rest.
Explanation: