Answer:
The prediction of the student about the amount of reactant and product is incorrect.
No, I do not agree with the student’s prediction because the amount of reactant is always equals to the amount of product. According to the Law of Conservation of Mass, mass cannot be created nor destroyed. Therefore in any chemical reaction the mass of the products must equal or same to the mass of the reactants so according to this law, the prediction of the student is incorrect.
Explanation:Give brailiest please
Answer:
The chemical reaction that occurs when vinegar and baking soda (sodium bicarbonate) are combined, creates a gas that is known as carbon dioxide (or CO2). I would agree with the student's prediction because the atoms rearrange themselves to create the product.
Explanation:
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How many energy levels does iron have
Answer:
Number of Energy Levels: 4
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 14
Fourth Energy Level: 2
Explanation:
Hope It Helps!
Answer:
4 energy levels
Explanation:
1st energy level = 2 electrons
2nd energy level = 8 electrons
3rd energy level = 8 electrons
4th energy level = 8 electrons
Copper has two naturally occurring isotopes: Cu-63 with mass 62.9395 amu and a natural abundance of 69.17% and Cu-65 with mass 64.9278 amu and a natural abundance of 30.83%. Calculate the atomic mass of copper.
Answer
63.55
Explanation:
63
C
u
has
69.2
%
abundance.
65
C
u
has
30.8
%
abundance.
So, the weighted average is
62.93
×
69.2
%
+
64.93
×
30.8
%
A block of material has a density of 1.29 g/cm. what is the volume of 190 g in cubic
centimeters?
No units required
Answer:
147.28 cm³
Explanation:
Density = m/V
1.29 g = 190 g/cm3/V
V = 190 g/cm³ : 1.29 g
V = 147.28 cm³
Iron (II) chloride
Covalent or ionic
Answer:
ionic
Explanation:
Iron(II) chloride, also known as ferrous chloride, is the chemical compound of formula FeCl2. It is a paramagnetic solid with a high melting point. The compound is white, but typical samples are often off-white
who is generally called the father of modern chemistry
Explanation:
Antoine Lavoisier is the answer
Answer:
Antoine Lavoisier is the father of chemistry
Explanation:
Antoine-Laurent de Lavoisier, also Antoine Lavoisier after the French Revolution, was a French nobleman and chemist who was central to the 18th-century chemical revolution and who had a large influence on both the history of chemistry and the history of biology.
Which of the cells shown is a prokaryote?
A) muscle cell B) nerve cell C) bacterium D) red blood cell
Which statement(s) correctly compare the masses of protons, neutrons, and electrons? Select two options.
1. Protons and neutrons have similar mass.
2. Protons and electrons have similar mass.
3. Neutrons and electrons have similar mass.
4. Protons are smaller than a neutron or an electron.
5. Neutrons are smaller than a proton or an electron.
6. Electrons are smaller than a proton or a neutron.
Answer:
6 Electrons r smaller than a proton or a neutron
Answer:
1st and last one
Explanation:
3. How does
photosynthesis affect
your daily life?
Answer:
to create oxygen and energy in the form of sugar
Explanation:
photosynthesis is the process by which plants use sunlight, water, and carbon dioxide
phenolphthalein is used as a visual indicator in a strong acid-strong base titration because
The pH range of phenolphthalein is 8.3 - 10.0, which is suitable with the pH range of Strong Acid and Strong base titration and so phenolphthalein is used as a visual indicator in a strong acid-strong base titration.
What is an Indicator ?Any substance that gives a clear visible indication of the presence or absence of a particular concentration of a chemical species, such as an acid or an alkali in a solution, usually by a colour change.
The pH range of Strong Acid and Strong base titration is 3–11 and equivalent point is at 7
the pH range of Strong Acid and Weak base titration, is 3–8 and equivalent point is below 7
the pH range of Weak Acid and Strong base titration, is 6 - 11 and equivalent point is above 7
So for titration , an indicator with suitable pH range is used
The pH range of phenolphthalein is 8.3 - 10.0.
Therefore phenolphthalein is used as a visual indicator in a strong acid-strong base titration.
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1) pbo+co-->pb+co2 which type of reaction is this?
a) redox reaction
b) oxidation reaction
c) reduction reaction
d) none of the above
PbO + CO → Pb + CO₂
Oxidation States of the Elements
Reactants Products
Pb +2 0
O -2, -2 -4
C +2 +4
Since the oxidation state/number of Pb decreased, it is being Reduced.
Since the oxidation state/number of C increased, it is being Oxidized.
∴ this is a Redox Reactionwhat is the molar mass of dimethylglyoxime, c4h8n2o2?
Explanation:
The molar mass of a compound can be calculated by finding the molar of the individual atoms that combine to make the compound.
Molar mass of compound =
∑ (molar mass of element × number of atoms of the element)
∴ Molar mass of dimethylglyoxime
= 4C + 8H + 2N + 2O
= [(4 × 12.011) + (8 × 1.0080) + (2 × 14.007) + (2 × 15.999)] g/mol
= 116.12 g/mol
∴ the molar mass of dimethylglyoxime = 116.12 g/molwhat are the conditions from our notes that affect natural Selection?
Answer:
Conditions that affect natural selection are reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
Which metalloid has five valence electrons in the fourth electron shell?
antimony
germanium
selenium
arsenic
Answer:
A- antimony
Explanation:
Answer:
A
Explanation:
are protons attracted to neutrons or electrons or both?
Answer:
protons and electrons attract each other.
Explanation:
neutron as no charge, proton and electron are exactly the same size but opposite. ( the opposite charge attract)
The protons possess a positive charge so they attract negatively charged electrons.
What is a proton?A proton can be described as a stable subatomic particle, a symbol with a positive charge of +1e elementary charge. Proton's mass is slightly less than that of a neutron but 1836 times the mass of an electron.
Protons and neutrons are jointly referred to as "nucleons" each with masses of approximately one atomic mass unit. More than one proton can be present in the nucleus of an atom. They give the attractive electrostatic central force which holds the atomic electrons.
The number of protons in the nucleus is referred to as the atomic number and is represented by the symbol Z. Since each element in the modern periodic table has a unique number of protons, its own unique atomic number, determines the chemical characteristics of the element.
As the neutrons are neutral do not carry any charge so the protons do not attract neutrons.
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How do you know where something fits on the electromagnetic spectrum? I currently have the Hz but do I need to convert that into something else?
tại sao lại có cầu vồng
Answer:
because of the reflection that the Sun makes on the water after it rained.
bởi vì sự phản chiếu mà mặt trời tạo ra trên mặt nước sau khi trời mưa
Explanation:
the variable part of an amino acid is the __________.
answer: the variable part of an amino acid is the: SIDE CHAIN
The best way to get the sugar out of a sugar-water solution is to __________.
Answer:
Distillation is the process by which sugar can be separated from the sugar solution.
Explanation:
Distillation, or classical distillation, is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.
Answer:
Boil the water, this would cause the water to evaporate and will leave behind the sugar crystals, which is known as distillation.
2. Describe the difference between:
(a) a group and a period
Answer:
A group is a vertical row on the periodic table and a period is a horizontal row on the periodic table.
Explanation:
Answer:
A group on the periodic table refers to the vertical arrangement of the elements while a period refers to the horizontal rows of elements
How much heat is needed to raise a 0.30 g piece of aluminum from 30.C to 150C? The specific heat of aluminum 0.900j/gC
Answer:
hi
Explanation:
How long should you monitor a person who shows signs of a mild allergic reaction
Answer:
Most reactions occur quickly after ingestion or contact with the allergen, but some can occur up to a few hours later. There can also be a second phase of the reaction when symptoms reoccur. It is important to keep an eye on your child for about 6-8 hours following the first reaction.
Explanation:
what is the molar mass of dimethylglyoxime, c4h8n2o2?
Answer: 116.12 g/mol
Explanation:
The molecular mass of a formula unit of dimethylglyoxime is calculated as 116 g/mol.
What is molecular mass?The molecular mass can be given as the sum of the mass of each element in the formula unit of the compound.
The dimethylglyoxime is the compound with molecular formula, [tex]\rm C_4H_8N_2O_2[/tex].
The mass of each element in the compound is:
Carbon = 12 gramsHydrogen = 1 gramsNitrogen = 14 gramsOxygen = 16 gramsSubstituting the mass in the formula unit of the compound as:
[tex]\rm C_4H_8N_2O_2=4(carbon)+8(hydrogen)+2(nitrogen)+2(oxygen)\\ C_4H_8N_2O_2=4(12)+8(1)+2(14)+2(16)g\\ C_4H_8N_2O_2=116\;g[/tex]
The molecular mass of dimethylglyoxime is 116 g/mol.
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1. A sample of nitrogen occupies a volume of 250 mL
at 298 K. What volume will it occupy at 268 K?
Answer:
0.225 L = 225 mL
Explanation:
Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up
Mathematically, we can write that as:
V1/T1 = V2/T2, where 1 and 2 are the two situations
So, when we substitute the values in, we get:
0.25 L/298 K = V2/268 K
Rearranging this, we get:
(0.25/298) x 268 = 0.225 L = 225 mL.
This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)
Let me know if this makes sense, and hope I helped! :)
when the n quantum number equals 1, we are in what orbital?
Answer:
p orbital
Explanation:
Studying the brightness of a star can help scientist determine what part of the life-cycle a star is in. Is this true or false
Answer:
what do you mean?
Explanation:
Studying the brightness of a star can indeed help scientists determine what part of the life-cycle a star is in. The brightness of a star is directly related to its stage in the life cycle.The statement is true.
During the early stages of a star's life, it is formed from a cloud of gas and dust. As the star contracts under its own gravity, it starts to heat up and emits light. This is known as the protostar stage.
As the star continues to contract, it reaches a point where the core temperature becomes hot enough for nuclear fusion to occur. At this stage, the star enters the main sequence phase, where it will spend the majority of its life. The brightness of the star in this phase is determined by its mass. More massive stars are brighter than less massive ones.
As the star ages, it exhausts its hydrogen fuel in the core and begins to evolve. Depending on its mass, a star can become a red giant, a white dwarf, a neutron star, or even a black hole. Each of these stages has a different brightness profile.
By observing the brightness of a star over time, scientists can gather information about its age, mass, and evolutionary stage. This can provide insights into the star's life cycle and help in understanding the processes occurring within it.
Thus, studying the brightness of a star is an important tool for scientists to determine what part of the life cycle a star is in. By analyzing its brightness profile, scientists can gain valuable information about the star's age, mass, and evolutionary stage.The statement is true.
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I'll mark brainly pls help
the temperature at which a liquid becomes a gas is called the
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Which coefficient of O, is needed to balance the equation C3Hg+ 02 - 3C02 + 4H2O?
OA. 2
OB. 3
O c. 5
OD 6
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The coefficient of oxygen is five which is needed to balance the given chemical equation and equation is C₃H₈ +5 O₂[tex]\rightarrow[/tex] 3 CO₂ +4 H₂O.
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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Elements in the same period have the same…
Answer:
Elements in the same period have the same (number of electron shells)
What is the main process that happens in the mantle?
Answer:
Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.
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