Answer:
Use a flame test to detect the presence of an alkali metal ion. A cleaned, moistened flame test wire is dipped into a solid sample of the compound. It is then put into the edge of a blue Bunsen flame. The flame colour produced indicates which alkali metal ion is present in the compound.
Explanation:
All the physical properties of a mineral result from the mineral's ___. internal arrangement of atoms presence of trace elements chemical formula specific gravity
Answer:
A. internal arrangement of atoms
Explanation:
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such defines the structure of a chemical element.
Generally, these atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.
Hence, all the physical properties of a mineral result from the mineral's internal arrangement of atoms.
The physical properties of the mineral result from the mineral should be A. internal arrangement of atoms
What is an atom?It refers to the smallest unit that contains the matter where the chemical elements should be formed. Also, it is the basic building blocks of matters that represent the structure of the chemical elements. Also, it should be made up of three different particles i.e. protons, neutrons, and electrons.
Hence, The physical properties of the mineral result from the mineral should be A. internal arrangement of atoms
Therefore, the first option is correct.
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Mass is measured in_______
or kilograms.
Answer:
the answer for another measurement of mass is grams
Which statement best describes how to determine whether a precipitate will form?
If Q > Ksp, a precipitate forms to reduce the concentrations of ions.
If Q > Ksp, more solid dissolves to increase the concentrations of ions.
If Q < Ksp, a precipitate forms to increase the concentrations of ions.
If Q < Ksp, more solid dissolves to reduce the concentrations of ions.
Answer:
karl marks.............
Explanation:
........
.....
....
............
Answer:
A. If Q > Ksp, a precipitate forms to reduce the concentrations of ions.
Explanation:
Edg 2021
Can anyone convert this 16 serving recipe to a 20 serving recipe:
1. 1 cup salted butter* softened
2. 1½ cup white (granulated) sugar
3. 1 cup light brown sugar packed
4. 2 tsp pure vanilla extract
5. 2 large eggs
6. 3 cups all-purpose flour
7. 1 tsp baking soda
8. ½ tsp baking powder
9. 1 tsp sea salt
10. 2½ cups chocolate chips (or chunks, or chopped chocolate)
Answer: just double the recipe my dude
Explanation:
everyone is gonna want atleast 3 of these cookies.
In which period do potassium and calcium lie in the Modern periodic table
Answer:
Period 4
Explanation:
On the modern periodic table, potassium and calcium lie in the fourth period, Period 4.
Elements are arranged on the periodic table based on their atomic numbers or number of protons.
Period 4 is made up of elements that have 4 energy levels. Potassium and calcium have 4 energy levels and belongs to the fourth period.what might happen to atoms if force didn't exist
Answer: If the strong force didn't exist, there would be nothing but hydrogen and neutrons floating in space.
Explanation:
How many moles of ammonia can be made from 0.150 moles of nitrogen gas
Moles of ammonia NH₃ = 0.3
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Reaction
N₂(g)+3H₂(g)⇒2NH₃(g)
mol ratio N₂ : NH₃ = 1 : 2
mol NH₃ :
[tex]\tt \dfrac{2}{1}\times 0.15=0.3[/tex]
What the best approach to get onto someone lol
Explanation:
Donate to their twitch and become a tier 5 sub.
the percentage of oxygen by mass in water is greatest when...?
ANSWER: We know, by law of constant proportion :
Chemical compounds always contains its component in constant fixed ratio or in fixed percentage without depend on its source, method of preparation and mass of compound.
Therefore, percentage of oxygen is same for any mass.
Hence, this is the required solution.
Explanation:
1
Photosynthesis and respiration are
important natural processes.
Which statement is correct?
(1 Point)
IF YOU ANSWER THIS CORRECT U WILL BE AWARDED ... 10pts and brainleist! :) PLEASEEE IM SUFFERING WITH THIS questionnn :(
Answer:
student b because when rotating around the earth the sun will only shine on one spot.
What type of Energy is stored in chemical bonds?
Answer:
potential energy
Explanation:
Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy.
Calculate the change of enthalpy for the reaction CH4 (g) + NH3 (g) --> HCN (g) +3H2 (g) from the following reactions:
Reaction 1: N2 (g) + 3H2 (g) --> 2NH3 (g) Change in enthalpy: -91.8 kJ/mol
Reaction 2: C (s, graphite) + 2H2 (g) --> CH4 (g) Change in enthalply: -74.9 kJ/mol
Reaction 3: H2 (g) + 2C (s, graphite) + N2 (g) --> 2HCN (g) Change in enthalpy: +270.3 kJ/mol
Include the following:
The numerical answer with correct units.
State which reactions, if any, you had to "Flip".
State which reactions you had to multiply, if any, to get the correct amount of the compound.
Answer:
255.8 kj/mol
Explanation:
So this is a Hess' Law problem, the CH₄ (g) + NH₃ (g) --> HCN (g) + 3H₂ (g) is what we want the other reactions to reflect. I usually set up problems like these like this in order to determine which reaction needs a coefficient change:
N₂ + 3H₂ --> 2NH₃ (ΔH=-91.8)
C + 2H₂ --> CH₄ (ΔH=-74.9
H₂ + 2C + N₂ --> 2HCN (ΔH=270.3)
CH₄ + NH₃ --> HCN + 3H₂
(I left out the states because it'll make the math easier) So, we want things to cancel out, meaning some of the reactants and products need to change places in order to do so. For the first reaction, we'd want to multiply the coefficients by [tex]\frac{1}{2}[/tex] in order to have it cancel out with the other reactions. For the third reaction, we'd want to we'd want to switch the products/reactants and multiply the coefficients by [tex]\frac{1}{2}[/tex] . Keep in mind whatever we do to the equation, we do to the ΔH. Should look like:
[tex]\frac{1}{2}[/tex]N₂ + [tex]\frac{3}{2}[/tex]H₂ --> NH₃ (ΔH=-45.9)
C + 2H₂ --> CH₄ (ΔH=-74.9)
HCN --> [tex]\frac{1}{2}[/tex]H₂ + C + [tex]\frac{1}{2}[/tex]N₂ (ΔH=-135)
CH₄ + NH₃ --> HCN + 3H₂
Everything cancels, so that means we can add all the ΔH, which should be -255.8 kj/mol, but we also change the sign in order to reflect what's happening in the reaction. (Sorry this is so long)
The enthalpy for the reaction, ΔH rxn is 255.95 kJ/mol
From the question,
We are to calculate the change in enthalpy for the reaction
CH₄(g) + NH₃(g) → HCN(g) +3H₂(g)
From the given reactions
Reaction 1: N₂(g) + 3H₂(g) → 2NH₃(g) Change in enthalpy: -91.8 kJ/mol
Reaction 2: C(s, graphite) + 2H₂(g) → CH₄(g) Change in enthalply: -74.9 kJ/mol
Reaction 3: H₂(g) +2C(s, graphite) +N₂(g) → 2HCN (g) Change in enthalpy: +270.3 kJ/mol
First, flip reactions 1 and 2 to get reaction 4 and 5 respectively
Reaction 4: 2NH₃(g) → N₂(g) + 3H₂(g) ΔHo : 91.8 kJ/mol
Reaction 5: CH₄(g) → C(s, graphite) + 2H₂(g) ΔHo : 74.9 kJ/mol
Now, multiply reactions 4 and 3 by half (1/2) to get 6 and 7 respectively
Reaction 6: NH₃(g) → ¹/₂N₂(g) + ³/₂H₂(g) ΔHo : 45.9 kJ/mol
Reaction 7: ¹/₂H₂(g) +C(s, graphite) +¹/₂N₂(g) → HCN (g) ΔHo : +135.15 kJ/mol
Now,
Add reactions 5, 6, and 7 together
Reaction 5: CH₄(g) → C(s, graphite) + 2H₂(g) ΔHo : 74.9 kJ/mol
Reaction 6: NH₃(g) → ¹/₂N₂(g) + ³/₂H₂(g) ΔHo : 45.9 kJ/mol
Reaction 7: ¹/₂H₂(g) +C(s, graphite) +¹/₂N₂(g) → HCN(g) ΔHo : +135.15 kJ/mol
-------------------------------------------------------------------------------------------------------------
CH₄(g) + NH₃(g) → HCN(g) + 3H₂(g) ΔH rxn = 255.95 kJ/mol
Hence, the enthalpy for the reaction, ΔH rxn is 255.95 kJ/mol
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PLZ HURRY 20 POINTS Into which layer of the Earth do plate boundaries extend? outer core lithosphere lower mantle asthenosphere
Answer:
Lithosphere is the layer of the Earth do plate boundaries extend
Explanation:
Answer:
B. lithosphere
Explanation:
hope this helps
What landform forms at convergent ocean plate boundaries?
Answer:
Mountains or Islands
Explanation:
They are formed when two plates collide, either crumpling up and forming mountains or pushing one of the plates under the other and into the mantle to melt
Mountain or islands are the landforms that are formed at convergent ocean plate boundaries.
What are landforms?
A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great ocean basins.
Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, stratification, rock exposure, and soil type. Gross physical features or landforms include intuitive elements such as berms, mounds, hills, ridges, cliffs, valleys, rivers, peninsulas, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountains) elements including various kinds of inland and oceanic waterbodies and sub-surface features.
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H e l p,,, ill give brainliest :)
Hi there! :)
Both are compounds.
[tex]CO_{2}[/tex] contains 1 carbon (C) atom and 2 oxygen (O) atoms.
It contains two different elements, so it is a COMPOUND.
[tex]Na_{2} O[/tex] is an IONIC compound with elements Sodium (Na) and Oxygen (O), which are different elements. Therefore, it is also a COMPOUND.
Identify 5 properties of matter that you encounter every day. Be detailed in your explanation.
Answer:To proceed scientifically, you could measure several properties of the unknown liquid and compare them with the properties of known substances. You might observe and measure such properties as color, odor, texture, density, boiling point, and freezing point.
Explanation:
which of the following elements is the smallest between phosphorus chlorine sulfur and silicon
Answer:
The atomic radius of elements are used to estimate the sizes of elements. The atomic radius is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state of metals.
To solve this problem we will obtain the atomic radius values of the given elements from a standard atomic radius table;
Si 111 pm
P 98 pm
Cl 79 pm
S 87pm
pm = picometer
We see that chlorine has the least atomic radius
Explanation:
Can matter be categorized by weather it’s a pure substance or mixture?
Explanation:
Matter can be broken down in two categories by pure substance and mixtures. Pure substance are further broken down into elements and compounds. Mixtures are physical combined structures that can be separated into their original components.
What type of particles move to create electricity
Again for the subject there was no sentence
Answer:
Electrons
Explanation:
In animals. energy is produced by the:
A. endoplasmic reticulum
B. nucleus
C. mitochondria
D. chloroplast
What factors affect the geometry of a molecule?
The factors that affect geometry of a molecule are
> The number of bonding electron pairs around the central atom.
> The number of pairs of non-bonding ("lone pair") electrons around the central atom.
The factors affect the geometry of a molecule are repulsion between pairs of valence electrons.
What determines molecular geometry?It is the branch of Organic Chemistry that names the geometric shapes that give shapes to atoms arranged in space within molecules, that is, molecular geometry studies the spatial distribution of atoms in molecules.
The main factor that determines the geometry of molecules is the repulsion between the pairs of valence electrons. The Lewis structure provides atomic connectivity, showing us the number and types of bonds between atoms. The spatial shape of a molecule is determined by its bond angles
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What mass of water is required to react completely with 157.35 g CO2? (Molar mass of H2O = 18.02 g/mol; molar mass of CO2 = 44.01 g/mol)
157.35 g CO2 =
g H2O
Answer:
64.43
Explanation:
i just took it
Answer:
64.43 and the next one is 16.94 on edge 2020
How many moles of Radium are in 280 g of Radium?
HELP PLEASE
Answer:
1.23 moles
Explanation:
Volume of Water -
Volume of Water * Object =
Mass of Object
60 ml
73.5 ml
51.3 g
Density
Answer:
3.8 g/mL
Explanation:
From the question given above, the following data were obtained:
Volume of Water = 60 mL
Volume of Water + Object = 73.5 mL
Mass of object = 51.3 g
Density of object =?
Next, we shall determine the volume of the object. This can be obtained as follow:
Volume of Water = 60 mL
Volume of Water + Object = 73.5 mL
Volume of object =?
Volume of object = (Volume of Water + Object) – (Volume of Water)
Volume of object = 73.5 – 60
Volume of object = 13.5 mL
Finally, we shall determine the density of the object as illustrated below:
Volume of object = 13.5 mL
Mass of object = 51.3 g
Density of object =?
Density = mass /volume
Density of object = 51.3 /13.5
Density of object = 3.8 g/mL
Thus, the density of the object is 3.8 g/mL
What is the term for a chemical reaction that uses more energy to break bonds than it releases when forming them?
-Help
Answer: Endothermic Reaction
Explanation:
what kind of bond does sodium and chlorine form
a. iconic
b.covalent
Answer:
This type of chemical bond is called an ionic bond because the bond formed between two ions of opposite charge. The sodium cation (Na+) and the chlorine anion (Cl-) are attracted to one another to form sodium chloride, or table salt.
Explanation:
Can I have brainliest if I am right, please?
How do we represent a shared pair of electrons when drawing the Lewis structure of a covalent bond
Answer:
Please mark as Brainliest!!
Explanation:
The former, known as a 'Lewis dot diagram,' indicates a pair of shared electrons between the atomic symbols, while the latter, known as a 'Lewis structure,' uses a dash to indicate the pair of shared electrons that form a covalent bond. More complicated molecules are depicted this way as well.
What is the primary factor determining whether an atom is
stable or unstable?
Answer: An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy and is unstable.
Explanation: I HOPED THAT HELPED!
The primary factor determining whether an atom is stable or unstable is the forces between the particle.
An atom is the smallest indivisible particle that makes up an element.
An atom is said to be stable if the forces between the particles of the nucleus are balanced. Whereas, an atom is unstable if its forces are unbalanced.
The instability of an atom is due to the excess of either neutrons or protons.
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Volcanic island acres are associated with which type of plate boundary
