Answer:
m=5k.gExplanation:
F=m×a sooo m=f÷am=15k.g.mls^2÷3m/s^2m=5k.g2. A golden-colored cube is handed to you. The person wants you to buy it for
$100, saying that it's a gold nugget. You pull out your old geology text and
look up gold in the mineral table, and read that its density is 19.3 g/cm3. You
measure the cube and find that it is 2 cm on each side, and has a mass of 40g.
What is its density? Is it gold? Should you buy it?
Answer:
Volume of the cube is 2*2*2 = 8cm^3.
Divide the weight (40g) over the volume (8cm^3).
Density is 5g/cm^3. Definitely not gold.
Explanation:
Yes, the given golden-colored cube is gold .The density of gold is 32 gm/cm³ and we must buy it.
What do you mean by density?Density is a mass of a unit volume of a material substance.
The formula for density is d = M/V, where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimetre.
To calculate density-
given
mass=40gm
side of cube =2cm
therefore, volume=(side)³
=8cm³
density=?
density=mass/volume
density=40/8
density=5 gm/cm³
The handed golden-colored cube is gold with its density 5gm/cm³ and hence we must buy it.
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More people in Australia have skin that is easily damaged by sunlight?
What are the chemical names of these ionic compounds?
Select the correct answer from each drop-down menu.
crystallization of sugar in a syrup can be avoided by addition of
Crystallization of sugar in a syrup can be avoided by adding inverted sugar. Invert sugar is a mixture of glucose and fructose, produced from sucrose. It is produced by hydrolysis of sucrose by heating with water and an acid such as lemon juice, vinegar or cream of tartar.
By adding invert sugar to a syrup, it reduces the amount of sucrose present in the solution and promotes the formation of glucose and fructose. This causes the solution to become more saturated and the syrup less likely to crystallize. Invert sugar is often used in the production of confectionery, ice cream, and other sweets.Inverted sugar can also be used to improve the texture and quality of baked goods. It is often used in cake recipes to enhance the flavor and increase the shelf life. It can also be used as a substitute for honey or corn syrup in recipes that require a liquid sweetener.In conclusion, the addition of invert sugar helps to prevent crystallization of sugar in syrup. Invert sugar is a mixture of glucose and fructose produced from sucrose by hydrolysis.
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Determine the number of atoms in 31. 0 grams of bromine, br. (the mass of one mole of bromine is 79. 90 g. )
By Avogadro's number, the bromine atoms are 2.34 × 10²³ atoms.
We need to know about Avogadro's number to solve this problem. Avogadro's number is the number that explains how many atoms are in one mol. The Avogadro's number is
Na = 6,02 × 10²³ atoms / mol
From the question above, we know that
gr = 31 grams
Mr = 79.9
Find the amount of bromine in moles
n = gr / Mr
n = 31 / 79.9
n = 0.39 mole
By using Avogadro's number, we can calculate how many bromine atoms
N = Na . n
N = 6,02 × 10²³ x 0.39
N = 2.34 × 10²³ atoms
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Does anyone know what 5.7365 x 10^-5 + 3.4891 x 10^-8 is? in scientific notation preferably?
Answer:
5.7400 × 10⁻⁵
Explanation:
Match up the characteristics below with the type of molecular bond they describe. Bonds found in Halite (between Na+ and Cl-) Bonds found between Si and O in the Si-O tetrahedron Bonds inside the water molecule (between the H and O ) Bonds that exist between two water molecules Strongest bond type Weakest bond type Bonds that are used by water to dissolve sal
The characteristics and the type of molecular bond they describe:
1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond
2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond
3. Bonds inside the water molecule (between the H and O): Covalent bond
4. Bonds that exist between two water molecules: Hydrogen bond
5. Strongest bond type: Covalent bond
6. Weakest bond type: Van der Waals bond
7. Bonds that are used by water to dissolve salt: Ionic bond
The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.
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Calculate the molarity of a solution which has 0.250 moles of sodium chloride, NaCl, dissolved in enough water to create 2.00 L of solution
The sodium chloride solution has a molarity of 0.125 M.
If 0.150 moles of NaCl are dissolved in 250.0 mL of solution, what is the concentration of the resulting NaCl solution?That is a mole, regardless of the call. We may then get the molarity of this solution by dividing the mole sub-solute, in this case 0.150 moles of solute, by the litter of solution, or 0.250 litre, and we have 0.6 moles per litre. It is 0.6 molar. Hence, this solution has a molar concentration of 0.6.
The molarity can be determined as follows:
Molarity = moles of solute/liters of solution
Molarity = 0.250 moles / 2.00 L
Molarity = 0.125 M
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1,6-diaminohexane is used to make nylon. What is the empirical formula of this compound if its percent composition is 62.1% C, 13.8% H, and 24.1% N
Therefore, the empirical formula of 1,6-diaminohexane is C3H8N.
Empirical formula of the 1,6-diaminohexane with given percent composition can be found as follows:
We have the percent composition as follows: 62.1% C13.8% H24.1% N
Therefore, the following formula can be used to calculate empirical formula of the 1,6-diaminohexane:
To calculate the empirical formula of 1,6-diaminohexane, we need to determine the ratios of the different atoms in the compound.
For this purpose, we can assume 100 g of the compound and convert the given percentages to grams:
62.1 g C ÷ 12.01 g/mol = 5.17 mol C13.8 g H ÷ 1.01 g/mol = 13.7 mol H24.1 g N ÷ 14.01 g/mol = 1.72 mol N
Using the mole ratios of each element, divide the number of moles of each element by the smallest number of moles.
5.17 mol C ÷ 1.72 mol N = 3.005 mol C1.72 mol N ÷ 1.72 mol N = 1.001 mol N13.7 mol H ÷ 1.72 mol N = 7.964 mol H
Therefore, the empirical formula of 1,6-diaminohexane is C3H8N.
The simplest ratio of atoms is 3 carbon atoms, 8 hydrogen atoms, and 1 nitrogen atom. It is important to note that the empirical formula is the simplest whole-number ratio of atoms in a compound.
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Help, quick, pls
What is a displacement reaction?
\(\begin{aligned} -5x+4y &= 3\\\\ x&=2y-15 \end{aligned}\)
which element has the largest bonding atomic radius? which element has the largest bonding atomic radius? niobium technetium yttrium molybdenum zirconium
Among the elements listed - niobium, technetium, yttrium, molybdenum, and zirconium - the element with the largest bonding atomic radius is Yttrium (Y).
Bonding atomic radius typically decreases across a period and increases down a group in the periodic table. In this case, all elements are part of the same period (Period 5), but Yttrium belongs to Group 3, which is further to the left compared to the other elements. Therefore, Yttrium has the largest bonding atomic radius.
Yttrium has the largest bonding atomic radius among the elements niobium, technetium, molybdenum, and zirconium.
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How many joules of heat are needed to raise the temperature of 15g of aluminum from 28C to 99C if the specific heat of aluminum is .90 j/gC?
Answer:
In order to increase the temperature of 1 g of aluminium by 1∘C , you need to provide it with 0.90 J of heat
Explanation:
what atomic or hybrid orbitals make up the sigma bond between c2 and h in ethylene, ch2ch2? (c2 is the second carbon in the structure as written.)
The C atoms in ethene use sp2 hybrid orbitals, which is in accordance with orbital hybridization theory.
Energy is ultimately the basis of everything in the chemical world. Orbitals combine because doing so results in a molecule that is less energetic and therefore more stable than it would be if the orbitals did not combine.
In order to create the second bond (Pi bond) in the C-C double bonds, one unhybridized p orbital must remain.
The two carbon atoms overlap one sp2 hybrid orbital to create a single sigma bond. The C-C double bond is finished when one of each C atom's p orbitals crosses over to create a pi bond.
When the H s orbitals overlap with the remaining sp2 hybrid orbitals from each C, the H atoms are joined to the C atoms by sigma bonds.
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calculate the standard cell potential at 25 ∘c for mg(s) fe2 (aq)→mg2 (aq) fe(s) express your answer to three significant figures and include the appropriate units.
The standard cell potential at 25°C for the reaction
Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s) is -2.36 V.
To calculate the standard cell potential, we can use the standard reduction potentials for the half-reactions involved and apply the Nernst equation.
The standard reduction potentials can be found in standard electrode potential tables.
The half-reactions involved in the cell are:
Mg²⁺(aq) + 2e⁻ → Mg(s) (reduction half-reaction)
Fe²⁺(aq) → Fe(s) + 2e⁻ (oxidation half-reaction)
The standard reduction potential for the reduction of Mg²⁺ to Mg is -2.37 V, and for the oxidation of Fe²⁺ to Fe, it is -0.44 V.
To calculate the standard cell potential (E°cell), we subtract the standard reduction potential of the oxidation half-reaction from the standard reduction potential of the reduction half-reaction:
E°cell = E°reduction - E°oxidation
E°cell = (-2.37 V) - (-0.44 V)
E°cell = -2.37 V + 0.44 V
E°cell = -1.93 V
The standard cell potential at 25°C for the reaction Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s) is -1.93 V.
Since the question asks for the answer to three significant figures, the final answer is -2.36 V.
The standard cell potential at 25°C for the reaction Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s) is -2.36 V. This indicates that the reaction is spontaneous in the forward direction, with Mg acting as the reducing agent and Fe²⁺ acting as the oxidizing agent.
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What are all the elements in a column called? NO LOOKING IT UP and if u do put it in ur words
Answer:
There have been seven horizontal rows of elements are called phases in the periodic table of elements. Groups, or families, are called vertical columns of elements. Metals, – anti, and metals are the most common ways of classifying the periodic table.
Explanation:
How many liters of H2O will be produced from 50 g of NaOH?
From 2NaOH+ H2SO4—> Na2SO4+2H2O
2.6. A mortar mixture of portland cement, sand, and water, but no hydrated lime, would probably produce a mortar with A. greater strength and workability.
B. insufficient bonding strength. C. little resistance to moisture penetration.
D. insufficient water retention.
B. insufficient bonding strength.
Hydrated lime is often added to mortar mixes to improve bonding strength between the bricks or stones being used. Without hydrated lime, the mortar may not bond well to the building materials, resulting in a weaker overall structure. While the absence of hydrated lime may slightly increase the strength and workability of the mortar, it is not worth sacrificing bonding strength.
The mortar may also have little resistance to moisture penetration without the addition of hydrated lime. Insufficient water retention may also be a possibility, but it is not as significant a concern as inadequate bonding strength.
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if input energyis 100J and useful is 70J what is the waste energy
Answer:
waste energy = 30 J
Explanation:
Given that.
Input energy = 100 J
Useful energy = 70 J
We need to find the amount of waste energy.
Waste energy = total energy - used energy
= 100 J - 70 J
= 30 J
Hence, 30 J of energy is waste energy.
in the insoluble and soluble salt lab, the dropper bottles containing the anions to be studied were all_______salt solutions.
Answer: Sodium v salt solutions
Explanation: In the Insoluble and Soluble Salt lab, the dropper bottles containing the anions to be studied were all sodium v salt solutions.
In the insoluble and soluble salt lab, the dropper bottles containing the anions to be studied were all aqueous salt solutions.
What is an aqueous solution?
An aqueous solution is a solution where the solvent is water. In chemistry, the term aqueous solution is used to describe a solution of one or more soluble substances in water. Aqueous solutions are important in numerous areas of chemistry and biochemistry, such as aquatic chemistry, biochemistry, and chromatography.
The term aqua refers to water and is thus aqueous solution indicating salt in the solvent which is water.
The aqueous solution is usually represented by (aq) while solid state is represented by (s), liquid state is represented by (l) and gaseous state is represented by (g).
Thus in the insoluble and soluble salt lab, the dropper bottles containing the anions to be studied were all aqueous salt solutions.
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Any form of water that falls to Earth: * 1 point condensation precipitation water cycle
Answer:
Precipitation
what is the principal ore of calcium
Answer:
Calcium as an element is found only in living creatures, but its ores are abundant and the major mined ores are calcite, dolomite, gypsum and anhydrite.
True or false: Sometimes older rocks end up on top of younger rocks.
Answer:
true
downstream to the riverbed. However, the most common mechanism to produce older rocks on top of younger is by thrust faulting. Thrust faults form where rocks are being compressed, usually by plate tectonic mechanisms. Thrust faults rip up older strata and pile it on top of younger rocks.
Explanation:
3. Comparing and Contrasting The compound
in blood that carries oxygen to cells throughout
the body contains iron. Iron has an atomic number
of 26. Iron-59 is used to diagnose disorders in the
blood. How is iron-59 different from all other
isotopes of iron? How is it the same?
HELPP ASAP
Its is different because Iron-59 contains 33 neutrons. We also call it the same because it has 26 protons.
Due to its 33 neutrons, iron-59 differs from other iron isotopes. Due to the fact that all isotopes have 26 protons, they are all the same.
What are Isotopes?
Isotopes two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Hence, Iron-59 is different form other isotopes of iron because it contains 33 neutrons. It is the same as other isotopes because they all contain 26 protons.
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Is fog homogeneous or heterogeneous? And why?
Aluminum reacts with excess hydrochloric acid to form aqueous aluminum chloride and 37.3 mL of hydrogen gas over water at 27°C and 751 mmHg. How many grams of aluminum reacted? The partial pressure of water at 27°C is 26.8 mmHg.
The amount of aluminum that reacted is approximately 0.069 grams.
To determine the mass of aluminum that reacted, we need to use the ideal gas law and consider the partial pressure of hydrogen gas. First, we calculate the pressure of hydrogen gas by subtracting the partial pressure of water vapor from the total pressure. The pressure of hydrogen gas is 751 mmHg - 26.8 mmHg = 724.2 mmHg.
Next, we convert the pressure of hydrogen gas from mmHg to atm by dividing by 760 mmHg/atm, giving us 0.953 atm.
Using the ideal gas law equation PV = nRT, we can calculate the number of moles of hydrogen gas. The volume of hydrogen gas is given as 37.3 mL, which we convert to liters by dividing by 1000 mL/L, giving us 0.0373 L. The temperature is given as 27°C, which we convert to Kelvin by adding 273.15, giving us 300.15 K. The ideal gas constant R is 0.0821 L∙atm/(mol∙K).
Plugging the values into the ideal gas law equation, we can solve for the number of moles of hydrogen gas: (0.953 atm) * (0.0373 L) = n * (0.0821 L∙atm/(mol∙K)) * (300.15 K).
Simplifying the equation, we find that the number of moles of hydrogen gas is approximately 0.00139 moles.
Since the balanced chemical equation between aluminum and hydrochloric acid is 2Al + 6HCl → 2AlCl₃ + 3H₂, we can conclude that 2 moles of aluminum react to produce 3 moles of hydrogen gas.
Using this ratio, we can calculate the number of moles of aluminum that reacted: (0.00139 mol H₂) * (2 mol Al / 3 mol H₂) = 0.000926 moles Al.
Finally, we can convert moles of aluminum to grams using the molar mass of aluminum (26.98 g/mol): (0.000926 mol Al) * (26.98 g/mol) ≈ 0.069 g Al.
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4A1 + 302 →
2Al2O3. How many grams of oxygen (O2)
are needed to produce 95 grams of
aluminum oxide (Al2O3)?
Answer: 44.706g Al2O3
Explanation:
4A1 + 302 → 2Al2O3
3×(16×2) 2{(27×2)+(16×3)}
= 96 = 204
So
To produce 204g of Al2O3,We need . 96g of O2
To produce 1g of Al2O3,We need
. (96÷204)= 0.47g of O2
To produce 95g of Al2O3,We need
. (0.47×95)= 44.706g of O2
.
So, 44.706 grams of oxygen (O2)
are needed to produce 95 grams of
aluminum oxide (Al2O3).
A sample of ch4o with a mass of 32.0 g contains __________ molecules of ch4o. group of answer choices 5.32 ´ 10-23 1.00 1.88 ´ 1022 6.02 ´ 1023 32.0
The correct option is (C) 6.02 X 10²³
A sample of CH₄O with a mass of 32.0 g contains 6.02 X 10²³ molecules of CH₄O.
To calculate the number of moles;
Molar mass of CH₄O = C + 4(H) + O
= 12.01 + 4(1.008) + 16
= 32.04 g/mol
So, 1 mol of CH₄O = 32.04 g of CH₄O
Given, 32.0 g of CH₄O
According to Avagadro's constant 1 mole of a substance contains 6.022× 10^23 particles (molecules, atoms or ions).
= (32.0 g/1)(1 mol CH₄O/32.04 g CH₄O)(6.02x10²³/1 mol CH₄O)
= 6.02 X 10²³ molecules of CH₄O
Hence, a sample of will contain number of molecules 6.02 X 10²³ molecules.
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What are foods that contain physical changes
A substance's form or appearance can be changed physically without affecting its chemical makeup.
Cutting fruits and vegetables, melting chocolate, and boiling eggs are examples of foods that go through physical changes.
For instance, slicing fruits and vegetables alter their size and shape, but not their chemical makeup.
Similar to melting chocolate, which transforms it from a solid to a liquid yet keeps its chemical makeup the same.
Physical changes Physical alterations are transformations that modify the physical appearance of matter without altering its chemical content. During the processing or cooking of food, numerous physical changes take place. As an example of a physical alteration, cutting fruits and vegetables modify their size and shape without changing their chemical makeup. Similar to melting, which transforms solid chocolate into liquid without altering its chemical composition. The solidification of melted cheese or the caramelization of sugar are two further instances of physical modifications in food. Food preparation and presentation are significantly influenced by physical changes in the meal.
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For the balanced equation shown below, how many grams of CO2 will be
produced from 74.23 grams of CO? CO + Fe3O4 → 3FeO + CO2
Answer:
116.64 g
Explanation:
74.23÷14 This is # of moles .
# of moles for co = 5.302
Then mass of co2 = 116.64
4. An element is a substance made up of two kinds of matter. True or false?
A. true
B. false
Answer:
false
Explanation:
Elements are pure substance. A ball of sodium will only have sodium atoms.