Answer:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
Answer:
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
What scientist explained the theory of atomic structure by relating it to the planetary model?
Answer: Rutherford
Explanation:
4. Identify each substance in the following word equation as a reactant or a product
limestone heat lime + carbon dioxide.
5. What is the difference between an exothermic and endothermic reaction?
6. Sodium salicylate is made from carbon dioxide and sodium phenoxide. Identify each
of these substances as a reactant or a product.
Pllssssssssssssss
Explanation:
4. limestone heat lime + carbon dioxide
The reactants in this expression above is limestone
The products of the reaction is carbon dioxide and lime
Reactant is the species that gives the product and it is usually found on the left hand side of the expression.
The product is the substance on the right hand side of the expression that forms through the experiment.
Heat is used to facilitate the reaction.
5. An exothermic reaction is a reaction in which heat is given off.
An endothermic reaction is a reaction in which heat is absorbed in the process.
An exothermic reaction is always warmer after the reaction whereas an endothermic reaction is colder at the end of the reaction.
6. Sodium salicylate is made from carbon dioxide and sodium phenoxide.
The reactants are:
Carbon dioxide and sodium phenoxide
The product is:
Sodium salicylate
Study the chemical reaction.
4Fe + 3O2 → 2Fe2O3
What is the mole ratio between Fe and O2?
Answer: The mole ratio between Fe and [tex]O_2[/tex] is [tex]\frac{4Fe}{3O_2}[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The given balanced chemical equation is :
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
Thus 4 moles of iron (Fe) reacts with 3 moles of oxygen gas [tex](O_2)[/tex] to give 2 moles of ferric oxide [tex](Fe_2O_3)[/tex]
The mole ratio between Fe and [tex]O_2[/tex] is [tex]\frac{4Fe}{3O_2}[/tex]
A mineral has these 5 characteristics
i need help asap plz
Answer:
Incorrect
Explanation:
Sodium has 11 atoms
Answer:
[tex]incorrect......[/tex]
Morocco is separated into different territories of land with tribes often fighting for power to this day.
Answer:
umm whats the question??
Explanation:
Which of the following reactions is an example of a single replacement reaction?
Select one:
a. H2 + O2 --> H2O
b. CH4 + O2 --> CO2 + H2O
c. NaI + Br2 --> NaBr + I2
d. H2CO3 --> H2O + CO2
Answer:
C
Explanation:
Single replacement reactions is when only one element gets replaced / changed. This usually looks like this: A + BC = B + AC or A + BC = C + AB
Therefore, the number of reactants must be equal to the number of products, since no actual combinations / break ups are occurring.
Answers A and D are eliminated right away since the number of products don't equal the number of reactants.
Answer B is wrong because it does not show simply one element being replaced, instead, two compounds are being formed. It doesn't look like the example given.
Only answer C shows that one element is replaced:
The iodine is replaced with bromine to form NaBr + I2
The chemical equation NaI + Br₂ --> NaBr + I₂ is an example of single replacement reaction.
What is chemical equation?
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 .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Anything that has mass and takes up space
Answer:
true
Explanation:
Answer:
is matter
Explanation:
Por qué el atomismo de balton se le considera un teoría científica mientras que a leucipio y Demócrito no?
Answer:
Because Democritus or Liucipius cannot demonstrate or proof their ideas as they did not have any equipment or any research to prove the existence of atoms.
Explanation:
John Dalton, Democritus and Leucipius are some of the greatest scientist and scholars of the past.
Democritus originally proposed or gave the idea of the of the composition of the matter of indivisible and tiny particles. John Dalton is credited for the beginning of the modern atomic theory.
Democritus believed that a matter is made up of atoms that can move about empty spaces. They are small, indestructible, solid, indivisible and of different shapes and sizes. Democritus proposed his idea at that time as there were no scientific advancement or instruments to prove his ideas about atoms.
Later on when science and scientific processes were advanced, Dalton was able to prove and proceed on the atomic model theory.
Democritus cannot prove his ideas as there were no instruments or advance scientific processes and so people felt his ideas as illogical. His proposals were based on his ideas.
Use the drop Dow menus to select the names of the labeled structures
Answer:
theres no picture
Explanation:
Which coefficients will balance this equation? *
Ag +
C2 >
AC2
Answer:
16Ag + 2C2 ---> 4 Ag4C
Explanation:
Ag + C2 ----> AgC2
The valence of Ag is one
Valence of Carbon is four
A balanced equation would be
16Ag + 2C2 ---> 4 Ag4C
4 Part of a human body system is pictured.
-Kidney
Ureter
Bladder
The main function of this system is to
F control reproduction
G transport oxygen
H produce hormones
J remove waste
Kidney in our body functions as a sieve in to remove wastes. Ureter, bladder and kidney as well are part of excretory system in animals. Hence, option J.
What is excretory system?Human body contains a group of organ systems to perform specific functions. Excretory system is an organ system for the excretion or removal of wastes after digestion form the body.
The main component of excretory system is kidney by which the wastes from the circulatory system is removed through urine. Ureter and bladder are extensions of kidney. After absorption of water and other nutrients remaining uric acid or urine is stored in the bladder to remove.
Kidney contains a number of sieve like structures called nephrons they are the filtering units of kidney.Nephrons are microscopic structural units of kidney by which wastes are filtered to produce urine and remove.
Therefore, all the given organs, kidney, ureter, bladder etc are part of excretory system and they plays a role in removing wastes from the body. Hence, option J is correct.
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When naming a compound, which of these is written first?
Answer:
cation
Explanation:
Metal
Nonmetal
Anion
Cation
When naming a chemical compound, the cation is written first before anything else.
A typical ionic compound consists of two components - the cation and the anion. While the cation is positively charged in ion, the anion is negatively charged. The cation of a typical ionic compound is named first before the anion and the name often carries that of the element that composes it.
The name of the element that makes up the anion is modified by removing the last few characters ending the name and replacing it with the suffix 'ide'. For example, NaCl is named sodium chloride.
At the time of naming a compound, the one that would be written first would be:
- Cation
The compounds are described as substances that consist of varying combinations of elements from the chemical union. The compounds are given the name by starting with the cation(+ve charged ion) that it possesses followed by the anions(-ve charged ions) it contains.For example, KCl(potassium chloride) involves K+ cations and Cl- anions. Thus, 'cation' would be the correct answer among the given options as they come later in the process.Learn more about 'Compound' here:
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Describe how energy enters AND moves throughout the different trophic levels of an ecosystem
Answer:
The flow of energy from one trophic level to another creates the energy cycle. In this cycle, energy is neither created nor destroyed. Energy flows from one trophic level to another. The primary source of energy is solar energy. Plants uses solar energy to produce their food by the process of photosynthesis. The food produced by the plants are consumed by the primary consumers. The plan eating animals consume food produced by the plants and they form the second trophic level. In the third tropic level the carnivores get the energy by eating the herbivores. After the death of the carnivores, decomposers act on them and the nutrients are ultimately returned to the soil.
I NEED HELP BIG TIME PLZ HELP ME (ILL GIVE 40 POINTS) What is true of electrons? (3 points) a They are positively charged and located inside the nucleus. b They are positively charged and located outside the nucleus. c They are negatively charged and located inside the nucleus. d They are negatively charged and located outside the nucleus.
Answer:
d.
Explanation:
Can someone pls help me with this pls
Answer:
I would say element
Explanation:
because it is made of two different types of atoms chemically bonded together!
I'm sorry if wrong!
Write down a question about yeast fermentation that can be answered through scientific investigation.
Explanation:
Alcoholic fermentation converts one mole of glucose into two moles of ethanol and two moles of carbon dioxide, producing two moles of ATP in the process. The overall chemical formula for alcoholic fermentation is: C6H12O6 → 2 C2H5OH + 2CO
Answer:
1. If you leave yeast fermentation out for 3 days what happens?
2. If you put yeast fermentation out in the sun will it still work?
Explanation:
These can be answered through scientific investigation.
:)))))))
answers to student exploration : stoichometry (GIZMOS) WORTH 100 POINTS AND BRAINLIEST
For the balanced equation shown below, if the reaction of 77.0 grams of CaCN2 produces 26.1 grams of NH3, what is the percent yield?
CaCN2+3H2O=>CaCO3+2NH3
%yield = 86.93%
Further explanationGiven
Reaction
CaCN₂+3H₂O=>CaCO₃+2NH₃
Required
The percent yield
Solution
mol CaCN₂(MW= 92 g/mol) :
= mass : MW
= 77 g : 92 g/mol
= 0.834
From equation, mol NH₃ :
= 2/1 x mol CaCN₂
= 2/1 x 0.834
= 1.668
Mass NH₃(theoretical):
= 1.668 mol x 18 g/mol
= 30.024 g
% yield = (actual/theoretical) x 100%
%yield = (26.1/30.024) x 100%
%yield = 86.93%
I need help ASAP pls
What is a moon phase that looks like less than a half circle from earth?
Answer:
last quarter moon/half moon
Explanation:
2C3H7OH + 9O2 --> 6CO2 + 8H2O
Determine the number of grams of CO2 produced from the reaction of 5.55 moles of C3H7OH
733 g CO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] 2C₃H₇OH + 9O₂ → 6CO₂ + 8H₂O
[Given] 5.55 mol C₃H₇OH
Step 2: Identify Conversions
[RxN] 2 mol C₃H₇OH → 6 CO₂
Molar Mass of C - 12.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Stoichiometry
Set up conversion: [tex]\displaystyle 5.55 \ mol \ C_3H_7OH(\frac{6 \ mol \ CO_2}{2 \ mol \ C_3H_7OH})(\frac{44.01 \ g \ CO_2}{1 \ mol \ CO_2})[/tex]Multiply/Divide: [tex]\displaystyle 732.767 \ g \ CO_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
732.767 g CO₂ ≈ 733 g CO₂
How many grams is 5.4x10 to the 23 molecules of al2o3?
Answer:
91.49 grams
Explanation:
No of molecules = no of moles × Avogadro's number
No of moles = No of molecules / Avogadro's number
Number of moles = 5.4×10^23/6.02×10^23
Number of moles = 0.897 moles of Al2O3
Number of moles = mass in gram / molar mass
Mass in gram = number of moles× molar mass
Mass in gram = 0.897× 102
91.49 grams
What is the mass, in grams, of one mole of any substance known as?
A. atomic mass
B. molar mass
C. molecular weight
D. atomic number
The answer is B. the molar mass.
The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles.
AH for the reaction:
SO
2 (g) → S (s) + O2 (g)
Answer:
the ans is wrong
What is the density of an object with a mass of 34g and a volume of 13 cm3?
Answer:
d = 2.62 g/cm³
Explanation:
Given data:
Density of object = ?
Mass of object = 34 g
Volume of object = 13 cm³
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
By putting values,
d = 34 g/ 13 cm³
d = 2.62 g/cm³
please help :) thanks
Explanation:
it is the one you have selected because it is the only solid one
Please help me answer this fast. I will give brainliest!
1. What is the theoretical
yield of C6H5Br in this reaction when 30.0 g of C6H6
reacts with excess Br2? If the
actual yield of C6H5Br was 56.7
g,
what
is
the
percent
yield?
Answer:
The theoretical yield in grams is 60.292 grams, and in moles the theoretical yield is 0.384. The percent yield is 94%.
Explanation:
The theoretical yield of bromobenzene is 60.3 grams and the percent yield of the reaction is 94.0%.
Explanation:
The percentage yield of the reaction is given by :[tex]Yield(\%)=\frac{\text{Actual or experimental yield}}{\text{Theoretcial yield}}\times 100[/tex]
Experimental yield is the amount of product produced after the carrying out the reaction practically.Theoretical yield is the amount of product calculated mathematically by using the amount of reactant.Given:
Mass of benzene = 30.0 g
The actual yield of bromobenzene = 56.7 g
To find:
Theoretical yield and percent yield of the reaction.
Solution:
Mass of benzene = 30.0 g
Moles of benzene =[tex]\frac{30.0 g}{78.11 g/mol}=0.384 mol[/tex]
[tex]C_6H_6+Br_2\rightarrow C_6H_5Br+HBr[/tex]
According to reaction, 1 mole of benzene gives 1 mole of bromobenzene, then 0.384 moles of benzene will give:
[tex]=\frac{1}{1}\times 0.384 mol=0.384 \text{mol of bromobenzene}[/tex]
Mass of 0.384 moles bromobenzene:
[tex]=0.384 mol\times 157.02g/mol=60.3 g[/tex]
The theoretical yield of bromobenzene = 60.3 g
The actual yield of bromobenzene = 56.7 g
The percent yield of the reaction:
[tex]Yield(\%)=\frac{56.7 g}{60.3 g}\times 100=94.0\%[/tex]
The theoretical yield of bromobenzene is 60.3 grams and the percent yield of the reaction is 94.0%.
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help please!!
*8th grade science
Five friends are eating ice cream. They wondered why their metal spoons were so cold. This is what they said:
Dane: I think the cold from the ice cream was transferred to the spoon.
Alex: I think a metal spoon is a good conductor of cold.
Mayra: I think heat from my hand moves through the spoon to the ice cream.
Elise: I think it is because there is more cold than heat.
Astrid: I think it is because things made of metal are cold.
Who do you think has the best idea? Explain your thinking using your knowledge of heat transfer as well as your
knowledge of insulators and conductors.
Answer:
alex
Explanation:
I dont know how to explain it but it is alex