Answer:
Yes, this ring is pure gold because when we divide the mass by the volume we get our density for the ring, which comes out to about 19.32.
Explanation:
Which of the following is true of a compound but not a mixture? (1) A compound contains more than one element.
(2) All the nuclei in a compound contain the same number of protons.
(3) A compound may be heterogeneous.
(4) The composition of a compound does not vary
The composition of a compound does not vary because it is made up of fix ratio by mass.
What is compound?A compound is a chemical substance that is composed of more than one element that held together by chemical bonds and produces fix ratio by mass so we can conclude that the composition of a compound does not vary because it is made up of fix ratio by mass.
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what are the mitigating measures for flood,earthquake and fire?
Answer:Securing heavy objects to walls and floors, such as shelves, bookcases, cabinets, and water heaters.
Explanation:
What is an atomic element
Answer:
An atomic element is an element which exists independently as atoms and can still react with other elements forming a compound
What is an orbital? (10 points)
Which term identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius?
Specific heat
Boiling point
Melting point
Specific heat capacity
The term that identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius is Specific heat capacity.
What is specific heat capacity?
Specific heat capacity is the quantity of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius. The unit of specific heat capacity is joule per gram per degree Celsius (J/g⁰C).
Difference between heat capacity and specific heat capacitySpecific heat capacity is heat required to raise the temperature of a unit mass of a substance while heat capacity is the quantity of heat required to raise the temperature an entire mass of a substance.
Heat capacity is measure in Joules (J) while specific heat capacity is measured in joule per gram per degree Celsius (J/g⁰C).
Thus, the term that identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius is Specific heat capacity.
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The term that identifies the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius is : ( A ) Specific heat
Specific heatSpecific heat also known specific heat is the amount of heat that is added to 1 unit ( gram ) of a substance in order to raise its temperature by one ( 1 ) degree Celsius of temperature.
Hence we can conclude that The term that identifies the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius is Specific heat
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Please be fast! I will mark brainliest!
H2O + C16H17NaO14 = CO2 + 8H20 + C2H3NaO3 Since there are 19 Hydrogen on the Reactants side, due to Law of Conservation of Mass, there must be ___Hydrogen on the Product side.
A. 0
B. 2
C. 8
D. 19
Answer: 8
Explanation:
Gold can undergo transmutation. Which equation could correctly describe this radioactive decay?
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper Re + Superscript 4 Subscript 2 Baseline Upper H e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 4 Subscript 2 Baseline Upper H e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript negative 1 Baseline e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript positive 1 Baseline e
um B is the answer on the unit test
Answer:
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript positive 1 Baseline e
Answer: the answer is B
Explanation:
just took the assignment
what is a redox reaction ?
Answer:
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Redox is a type of chemical reaction in which the oxidation states of atoms are changed.
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What type of energy is transferred during heating?
A. Thermal
B. Temperate
C. Convective
D. Conductive
Thank u for helping !:)
Answer:
A.) Thermal
Explanation:
I got it correct on founders edtell
What is neutron?
What is Atom?
Answer:
A neutron is a subatomic particle with no charge and is found in the nucleus of an atom.
An atom is the smallest particle of an element that retains its identity in a chemical reaction.
Explanation:
hope this helps!! p.s. i really need brainliest :)
Answer:
See below.
Explanation:
Neutron is a subatomic particle which has a neutral charge and forms the nucleus of the atom.
Atom is the smallest unit of matter which composes solids, liquids, gases, and plasma.
Why do water pipes sometimes burst in winter? (Has to do with volume)
Answer:
Water pipes sometimes burst during the winter because the cold causes the water to expand when frozen so the pipes cant exactly stretch causing stress on the pipe until it inevitably bursts
Which of these characteristics differentiate electrons from protons and neutrons
The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
O 6
O 12
O 18
O 24
The number of electrons in the atom in its neutral state will be equal to 12. Therefore, option (2) is correct.
What is a neutral atom?A neutral atom can be defined as one in which the number of the positive charge will be equal to the number of the negative charge. Therefore, the overall electrical charge on such an atom is zero and that type of atom is called a neutral atom.
For a neutral atom, commonly say that the number of electrons is equal to the number of protons. All chemical elements present in the modern periodic table are neutral.
Given, the electrical charge of the nucleus of an atom is equal to + 12. It means the given atom has 12 protons. As the number of protons and electrons in the neutral atom is the same, therefore the number of electrons in the given atom is equal to 12.
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I’m just gonna keep doing these keep answers ga me you will get brainliest
Answer:
Thx
Explanation:
find the valu of
|2x-1|=x+1 is
Explanation:
|2x-1|=x+1
√(2x-1)²= x+1
(2x+1)²=(x+1)²
4x²-4x+1=x²+2x+1
3x²-6x=0
x²-2x=0
x(x-2)=0
x=0 or x=2
Metals can be involved in ____
Answer: ionic bonds, covalent bonds
Explanation:
Got it right on my test.
Metals can forms ionic bond with non-metals by losing electrons from metals to the non-metals. They can also form metal metal bonds when they make metallic complexes and dimers. Thus option 4 is correct.
What is ionic bonding ?Ionic bond is the strongest type of bond formed between metals and nonmetal. Metals are electron rich and thus they are electropositive. They can donate electrons to non-metals.
Electronegative non metal atoms gain one or more electrons from the metals and thus forms the ionic compounds. Hence, ionic compounds are formed between atoms of high electronegativity difference.
Non metals like oxygen, nitrogen , halogens etc are highly electronegative and withdraw electrons from metals. Ionic compounds can have polarity if there occurs a charge separation between atoms.
Metals can also form metal-metal bonds with other metals in the case of coordination compounds and organometallic compounds. Hence, option 4 is correct.
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Your question is incomplete. But your complete question probably was:
Metals can be involved in _______ ?
1, Covalent bonding
2.Ionic bonding
3. Metal-metal bond
4. Two of the above.
How many hydrogen (H) atoms are there in this chemical formula? 3C5HgNNaO4
There don't seem to be any H atoms in that formula. All I see is Hg, which is mercury.
Think of a substance that does not dissolve in water. Explain what happens when this substance is added to water.
An example would be oil. Oil is considered to be hydrophobic (which translates to "fear of water" so it is repelled by water). It floats on the top of water, which is why oil spills result in black blobs that float on the surface of the ocean rather than mix underneath the surface.
Calcium and water are the reactants in this chemical reaction. The products are calcium hydroxide and hydrogen gas. Which statement correctly describes the total mass of the products when the reaction is complete?
Explanation:
Using the Law of Conservation of mass,the mass of the reactants should be equal to the mass of the products after the reaction.
Why critical thinking is important for chemists?
Answer:
"Critical thinking is the analysis of available facts, evidence, observations, and arguments to form a judgment. The subject is complex; several different definitions exist, which generally include the rational, skeptical, and unbiased analysis or evaluation of factual evidence. Critical thinking is self-directed, self-disciplined, self-monitored, and self-corrective thinking. It presupposes assent to rigorous standards of excellence and mindful command of their use. It entails effective communication and problem-solving abilities as well as a commitment to overcome native egocentrism and sociocentrism." - Searched it up on Wiki, so at least I stated this-.
I hope this helps..?
Answer:
Critical thinking in the area of chemistry requires students to not just think about the concepts and principles of but also how they can be applied to other areas. Critical thinking creates an area of overlapping or related information to the nature of a certain function.
Explanation:
its simple plus hope this helps
Why is it difficult to make vaccines for viruses? (1 point)
O All known vaccine molecules must be tested to find the right one.
O All known viruses must be tested against new vaccines
O Viruses mutate to attack the vaccine molecules so new ones must be continually produced
O Vaccines are very small so it is difficult to determine if the molecule fits
Answer:
All known vaccine molecules must be tested to find the right one.
Explanation:
I took the test
In the diagram below, west is to the left, east is to the right, and the observer is looking toward the north. What is the direction of the wind?
A. NE
B. NW
C. SE
D. SW
When fluids are subjected to increases in pressure they tend to do this.
A.) evaporate
B.) contract
C.) expand
D.) solidify
Answer:
D.) solidify
Explanation:
. In an experiment, 1.90 g of NH3 reacts with 4.96 g of O2. 4NH3(g) + 5O2(g) ⟶ 4NO(g) + 6H2O(g) (i) Which is a limiting reactant? Show your working. (ii) How many grams of excess reactant remain? Show your working. (iii) How many grams of NO is formed? Show your working
1. The limiting reactant in the reaction is NH₃
2. The mass of the excess reactant remaining is 0.49 g
3. The mass of NO produced from the reaction is 3.35 g
Balanced equation4NH₃ + 5O₂ —> 4NO + 6H₂O
Molar mass of NH₃ = 14 + (3×1) = 17 g/mol
Mass of NH₃ from the balanced equation = 4 × 17 = 68 g
Molar mass of O₂ = 16 × 2 = 32 g/mol
Mass of O₂ from the balanced = 5 × 32 = 160 g
Molar mass of NO = 14 + 16 = 30 g/mol
Mass of NO from the balanced equation = 4 × 30 = 120 g
SUMMARY
From the balanced equation above,
68 g of NH₃ reacted with 160 g of O₂ to produce 120 g of NO
1. How to determine the limiting reactantFrom the balanced equation above,
68 g of NH₃ reacted with 160 g of O₂
Therefore,
1.90 g of NH₃ will react with = (1.90 × 160) / 68 = 4.47 g of O₂
From the calculation made above, we can see that only 4.47 g out of 4.96 g of O₂ given is needed to react completely with 1.90 g of NH₃.
Therefore, NH₃ is the limiting reactant.
2. How to determine the mass of the excess reactant remaining Mass of excess reactant (O₂) given = 4.96 gMass of excess reactant (O₂) that reacted = 4.47 gMass of excess reactant (O₂) remaining =?Mass of excess reactant (O₂) remaining = 4.96 – 4.47
Mass of excess reactant (O₂) remaining = 0.49 g
3. How to determine the mass of NO producedIn this case, the limiting reactant (NH₃) will be used.
From the balanced equation above,
68 g of NH₃ reacted to produce 120 g of NO
Therefore,
1.90 g of NH₃ will react to produce = (1.90 × 120) / 68 = 3.35 g of NO.
Thus, 3.35 g of NO were obtained from the reaction.
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An ideal solution is prepared by mixing 15.6 g of toluene, C6H5CH3, and 136.2 g of butan-
1-ol, C4H9OH at 25 °C. The vapour pressure of pure butan-1-ol is 885 Pa at this
temperature. Calculate the partial pressure of butan-1-ol in the vapour above the mixture.
This problem is providing the masses of both toluene and butan-1-ol and the vapor pressure of the latter when pure. Thus, it asks for the vapor pressure of this alcohol in the mixture, therefore the answer turns out 812 Pa.
Raoult's lawIn chemistry, when two pure liquids are mixed, their properties as a mixture differ from those when pure, for that reason we use the Raoult's law in order to quantify these properties as pure substances, or when mixed with other substances.
In such a way, one can write this law for butan-1-ol as follows:
[tex]P_{but}=P_{but}^{pure}*x_{but}[/tex]
Where we know its vapor pressure as 885 Pa and we want to calculate its partial pressure but first its molar fraction with the given masses converted to moles as follows:
[tex]x_{but}=\frac{n_{but}}{n_{but}+n_{tol}} \\\\n_{but}=136.2g*\frac{1mol}{74.121g}=1.838mol\\ \\n_{tol}=15.6g*\frac{1mol}{94.14g} =0.166mol\\\\x_{but}=\frac{1.838mol}{1.838mol+0.166mol}=0.927[/tex]
Finally, we solve for its partial pressure:
[tex]P_{but}=885Pa*0.917\\\\P_{but}=812Pa[/tex]
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A photon has a wavelength of 220 nm. How much energy does the
photon have?
Answer:
The energy of a photon with a wavelength of 350 nm is 5.7×10−19 J .12/05/2
Explanation:
What information does an acid or base equilibrium constant give?
The value of the equilibrium constant shows the relative amounts or concentrations of the reactants and products.
1.00 g of a compound is combusted in oxygen and found to give 3.14g of CO2 and 1.29 g of H2O. From these data we can tell thatA. the compound contains C, H, and some other element of unknownidentity, so we can’t calculate the empirical formula.B. the compound contains only C and H and has the empirical formulaof C6H.C. the compound contains C, H, and O and has the empirical formulaof CH3O.D. the compound contains only C and H and has the empirical formulaof CH2.E. None of the above is a true statement
Answer:
the compound contains C, H, and some other element of unknownidentity, so we can’t calculate the empirical formula
Explanation:
Mass of CO2 obtained = 3.14 g
Hence number of moles of CO2 = 3.14g/44.0 g = 0.0714 mol
The mass of the carbon in the sample = 0.0714 mol × 12.0g/mol = 0.857 g
Mass of H2O obtained = 1.29 g
Hence number of moles of H2O = 1.29g/18.0 g = 0.0717 mol
The mass of the carbon in the sample = 0.0717 mol × 1g/mol = 0.0717 g
% by mass of carbon = 0.857/1 ×100 = 85.7 %
% by mass of hydrogen = 0.0717/1 × 100 = 7.17%
Mass of carbon and hydrogen = 85.7 + 7.17 = 92.87 %
Hence, there must be an unidentified element that accounts for (100 - 92.87) = 7.13% of the compound.
You eat a large meal and then hike up a hill. What kind of energy transformation is your body performing?
Group of answer choices
Chemical energy to kinetic energy and gravitational potential energy
Chemical energy to kinetic energy and nuclear energy
Kinetic energy to chemical energy and light energy
Gravitational potential energy to sound energy and nuclear energy
Answer:
Chemical energy to kinetic energy and gravitational potential energy
Explanation:
The kinetic and potential energy is collectively known as the mechanical energy. When you eat a large meal and then hike up a hill the energy change taking place is Chemical energy to kinetic energy and gravitational potential energy. The correct option is A.
What is energy?The physical quantity which is transferred from one object to another to perform work or to heat the object is defined as the energy. The SI unit of energy is Joule and it is a derived unit.
The energy possessed by a moving body due to its motion is defined as the kinetic energy. The energy stored by an object due to its position is called the potential energy.
When we eat food, our body uses the chemical energy of food and during climbing, the body gets moved so the kinetic energy gets converted into gravitational potential energy.
Thus the correct option is A.
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A 6M sulfuric acid solution (H2SO4 in water) is flowing into a tank at the rate of 100 liters/min (also can be written 100 L/min). The density of the solution is 1.34 g/cm3 . Determine the value of the items requested below (show your work). For parts (b) - (d), first write out the equation using symbols for the appropriate variables, then algebraically solve for the unknown variables, and finally substitute in the numerical values and calculate the values for the unknown variables
Based on the flow rate data provided for the 6 M sulfuric acid solution;
molar flow rate = 600 mol/minMass flow rate = 58.8 kg/mintotal mass flow rate = 134 kg/min What is the molar mass of sulfuric acid, H2SO4?The molar mass of sulfuric acid is obtained from the molar atomic masses of it component elements.
Molar mass of H2SO4 = (2 × 1) + (32 × 1) + (16 × 4)
Molar mass of H2SO4 = (2 = 98 g/mol
Based on the flow rate data provided:
Moles of 6 M sulfuric acid in 100 L = molarity × volume
Moles of 6 M sulfuric acid in 100 L = 6 M × 100 L = 600 moles
molar flow rate = 600 mol/min
Mass of 600 moles sulfuric acid = moles × molar mass
Mass of 600 moles sulfuric acid = 600 × 98 = 58.8 kg
Mass flow rate = 58.8 kg/min
Mass of sulfuric acid in 100 L solution = volume × density
density of sulfuric acid = 1.34 g/cm^3 = 1.34 kg/L
Mass of sulfuric acid in 100 L solution = 1.34 kg/L × 100 L = 134 kg
Therefore, total mass flow rate = 134 kg/min
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