An element's chemical properties are determined by the number ofelectrons .
The number of electrons determine chemical properties of an atom as they are present in equal number outside the nucleus as that of protons .Protons contribute to the mass of an atom and give an identity to an atom .
As protons are positively charged there is a need to balance this positive charge and it is balanced by an equal number of electrons .As the valence electrons are the electrons which take part in chemicalreactions the element's chemical properties are determined by the number of electrons.
The number of neutrons has a negligible effect on the chemical nature of elements as they are neutral and have no charge.Indirectly, it's the electronic configuration of an element which determines the chemical properties of any element.
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O A physical change does not change the chemical formula of the substance
O A physical change has similar characteristics as a chemical change.
A physical change is a change in how the substances react with other substances.
The correct answer is physical change does not change the chemical formula of the substance.
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Answer:
B. a physical change does not change the chemical formula of the substance
Explanation:
Physical change does not change the substance or identity of an object
b) 1.7 x 10²⁶ atoms
c) 1.2 x 10²⁵ atoms
d) 3.0 x 10²⁴ atoms
e) 3.0 x 10²³ atoms
Can anyone explain this one?
The three states of matter are solid, liquid and gas phase. The solid has a more definite shape and volume. The particles are locked into place. It cannot be further compressed due to the bond that exists between the molecules. The kinetic energy of the molecules is close to none because the molecules are so close and so compact with each other. For liquids, it has a medium shape and volume. The particles can move or slide past each other due to the small space available for movement. It cannot be compressed further due to the repulsive forces that acts between them. The kinetic energy is medium. For gases, it has no shape and volume because the particles can move freely from one other. Their collisions are rare due to the distance between them. The kinetic energy of the molecules is high because there is room for movement. It can be compressed easily.
The balanced combustion reaction for butane is;
2C4H10 + 13O2 → 8CO2 + 10H2O
Molar mass of water = 18.02 g/mol
Molar mass of oxygen = 32 g/mol
2.46g H2O(1 mol H2O/18.02g)(13 mol O2/10 mol H2O)(32g O2/1 mol O2) = 5.68g O2
Position 2
position1
position4
position3
Answer: Position 1
Explanation:
Seasons on Earth occur due to tilt of of its axis. Earth's axis is tilted 23.5° from horizontal. Thus, when Earth moves in the orbit around sun, sometimes the northern hemisphere points towards the Sun and sometimes away. When it points towards the Sun, it experiences Summer season and while it points away, winter occurs. In between, spring and autumn occur.
Thus, from the given diagram, norther hemisphere would have summer time at position 1 when the northern hemisphere is facing the Sun.
Answer:
The correct answer is Position 1.
Explanation:
The rotational motion of the Earth causes some parts to receive more heat from the sun, while others receive less. Its axis of rotation runs vertically from the North Pole to the South Pole. Since this axis is not completely vertical, the sun's rays are projected with different intensity during the translation movement. Since the Earth is tilted slightly to the left and the axis points to the side where the Sun is at position 1, the sun's rays reach the northern hemisphere with more intensity and the southern hemisphere with less intensity.
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The changes shown are physicalchanges because when ice melts, it turns from solid to liquid.
Physical changes are when a substance changes in how it looks or acts without turning into something else. These changes can usually be undone, which means the substance can be brought back to how it was before.
When ice melts, it turns from solid to liquid. The tiny particles in the ice move around, but the stuff that makes up water stays the same. The process can go backwards, because the water that is a liquid can be turned back into ice.
When water gets really hot, it turns into gas called steam. The water molecules get enough energy to separate from each other and become vapor. Once again, the stuff that makes up water stays the same, and when steam cools down, it turns back into liquid water.
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Answer:
Because physical change are reversible change. we can reverse into the orginal effect.
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