Answer:
luster means either sheen/glow or reflected light
Explanation:
luster is the appearance of mineral's surface in terms of light-reflective qualities
Plz answer question 9 in the picture... with an explanation
Answer:
b)
Explanation:
A substance that cannot be broken down into simpler substances by chemical means. An element is composed of atoms that have the same atomic number, that is, each atom has the same number of protons in its nucleus as all other atoms of that element.
Answer:
Figure B show element
Explanation:
Element is made up of same type of atoms and in figure b only one type of atom is present
To what category do carnivores, herbivores, and omnivores belong? O A. producer O B. consumer O C. decomposer O D. composer
Answer:
B for sure
Explanation:
Because they all consume
Name the molecule when potassium reacts with chlorine?
Answer: Potassium Chloride
Explanation:
What are the two factors that determine the gravitational force
between any two objects?
Answer:
Gravity is your answer
Explanation:
Gravity hopes this helps
Use the half reaction method to balance the following reaction in acid:
I2 + Na2S2O3 -> Na2S2O4 + NaI
Answer:
I2 + 2S2O3^2- --------> S4O6^2- + 2I^-
Explanation:
The correct equation is;
2Na2S2O3 + I2 → Na2S4O6 + 2NaI
Oxidation half equation;
2S2O3^2- --------> S4O6^2- + 2e-
Reduction half equation;
I2 + 2e ----------> 2I^-
Overall balanced redox reaction equation;
I2 + 2S2O3^2- --------> S4O6^2- + 2I^-
is chex mix an example of a pure substance or mixture?
An illustration of a mixture is Chex Mix. It is made out of a variety of blended ingredients, including Chex cereal, pretzels, almonds, and spices.
A mixture is a grouping of two or more compounds that are physically mixed but are not chemically bound in chemistry. Each component of the combination keeps its unique characteristics and can be physically separated from it using techniques like filtration or distillation. Both homogeneous and heterogeneous mixtures exist. Homogeneous mixtures, like seawater, have a consistent composition throughout, whereas heterogeneous combinations, like oil and water, have separate phases and an unequal distribution. An illustration of a mixture is Chex Mix.
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Which of the following metals (M) will form an ionic compound with nitrogen with the general formula M3N2?
a
lithium (Li)
b
sodium (Na)
c
aluminum (Al)
d
beryllium (Be)
Beryllium (Be) will form an ionic compound with nitrogen with the general formula M[tex]_3[/tex]N[tex]_2[/tex]. Therefore, the correct option is option D.
What is metal?Metal refers to any of a class of substances that have excellent electrical and thermal conductivity, malleability, flexibility, or light reflection. Metals account for over 75% of any and all chemical elements currently known.
Aluminum, iron, salt, potassium, and magnesium are the most abundant elements in the Earth's crust. Most metals can be found in ores, while some, such as copper, gold, platinum, even silver, are frequently found in their free state because they do cannot easily react with other elements. Beryllium (Be) will form an ionic compound with nitrogen with the general formula M[tex]_3[/tex]N[tex]_2[/tex].
Therefore, the correct option is option D.
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why are the Alkali Metals the first row of the periodic table?
Explanation:
All atoms naturally want to have a completely full outermost shell of electrons.Howevee, elements in that first column of the periodic table all have one electron in their outermost shell. ..."since the alkali metals only have one valence electron,they typically achieve this state by giving up that electron.
I hope it's helpful!
eek helpppp ill give brainliestt
Answer:
S=Solid
Mg=Solid
B=Solid
Ca=Solid
Ar=Gas
H=Gas
Cs=Solid
Zn=Solid
Br=Liquid
Sb=Solid
N=Gas
Hg=Liquid
Explanation:
Calculate the mass (in g) of solute needed to prepare a solution with the given concentration and volume.
Sea water has a concentration of approximately 0.60 M sodium chloride. How much
sodium chloride is dissolved in 1.00 L of solution?
Coke has a concentration of 0.342 M. What mass of sugar (in g) is dissolved in a 2-L
bottle of coke?
What volume of concentrated nitric acid (15.8 M) is needed to prepare 4.0 L of a 2.0 M solution?
What volume of 9.0 M copper (II) sulfate stock solution is needed to prepare 3.0 L of a 5.0 M
solution?
Answer:
1. 35g NaCl.
2. 234g sugar.
3. 0.506L of concentrated nitric acid are needed.
4. 1.67L of 9.0M copper (II) sulfate are needed
Explanation:
Molarity is defined as the ratio between moles of solute and the volume of the solution.
1. 1.00L * (0.60mol / L) = 0.60 moles NaCl are dissolved
To convert moles to mass we must use its molar mass:
0.60mol NaCl * (58.44g/mol) =
35g NaCl
2. 2L * (0.342mol / L) = 0.684 moles Sugar = moles sucrose
0.684 mol * (342.30g / mol) = 234g sugar
3. 4L of a 2.0M are:
4L * (2.0mol/L) = 8moles
8mol * (1L / 15.8mol) = 0.506L of concentrated nitric acid are needed
4. 3.0L * (5.0 mol / L) = 15.0 moles copper (II) sulfate.
15.0mol * (1L / 9.0mol) = 1.67L of 9.0M copper (II) sulfate are needed
Round the measurement to 3 significant figures. 13.06
Answer: 13.1
Explanation: just round the .06 to 1 creating three sig figs.
How could the strength of an electromagnet be increased?
by reducing the length of the core (nail) of the electromagnet
by using the rubber material as the core for the electromagnet
by decreasing the amount batteries used for the electromagnet
by increasing the number of coils in the wires of the electromagnet.
I had this question on a test in K12
The answer is By increasing the number of coils in the wires of the electromagnet.
increasing coil wires is correct, like the other person answered.
What is a reactant?
A- Solid particles that have been separated from a solution
B- A substance that has the ability to be dissolved by a solvent
C- A mixture in which a solid and a liquid or two liquids are mixed occurs
D- The substance present before a chemical reaction occurs
Answer:
it is D
Explanation:
because it is a substance that participants in a chemical reaction.
If 2.32 moles of iron react with excess oxygen gas, how many moles of Fe2O3 can be produced?
Moles Fe₂O₃ produced : 1.16 moles
Further explanationGiven
2.32 moles of iron
Required
moles of Fe2O3
Solution
The reaction coefficient in a chemical equation shows the mole ratio of the reacting compounds (reactants and products)
Reaction
4 Fe + 3 O₂ ⇒ 2 Fe₂O₃
From the equation, mol ratio Fe : mol Fe₂O₃ = 4 : 2, so mol Fe₂O₃ :
= 2/4 x mol Fe
= 2/4 x 2.32
= 1.16 moles
Construct an ICE table to calculate the equilibrium concentration of S2− in a solution containing 0.04 mol of Fe(NO3)2. The Ksp of FeS is 8.0 x 10−19. Complete the table by typing in the correct answer, represented by the orange letters in the ICE table. (When typing a number that is between 0 and 1, insert a 0 before the decimal, and type values to two decimal places.)
Answer: a: 0.04
b: 0
c: x
d: x
e: x
f: 0.04
Explanation:
Why do you think that tsunamis occur most commonly in the Pacific Ocean?
I need help with this!
Explanation:
From top to bottom
transfer
substance
cooler
good
energy
metal
insulator
wood
heat
particles
particles
hotter
gases
convection
energy
Energy exists in different forms. Which of the following forms of energy best describes the energy stored
in food?
A. electromagnetic energy
B. mechanical energy
C. sound energy
D. chemical energy
Answer:
D. chemical energy
Explanation:
Food contains chemical energy as chemical energy is stored in bonds.
a piece of ribbon is shared equally among 5 girls what fraction of the ribbon does each girl get, 20 points!!!!
Answer:
5 piece of ribbon
Explanation:
Because ther are a piece of ribbon is shade
Which element has the largest atomic radius?
Be
F
Ga
Ba
Answer:
Ba
Explanation:
The trend for atomic radius is that it increases as you go down and decreases as you go right.
Convert CH4 to C2H6?
Dehydration of alcohol by conc. H2SO4.....?
Answer:
1.
CH4 + Cl2 → CH3-Cl + HCl
2CH3-Cl +2Na → C2H6
2.
CH3-CH2-OH ---(conc. H2SO4)----> CH2=CH2 + H2O
Explanation:
1. Conversion of methane to ethane
Step 1 - Treat methane with chlorine gas presence of ultraviolet light
CH4 + Cl2 → CH3-Cl + HCl
Step 2 - Treat chloromethane formed in step 1 with the sodium metal and dry ether (Wrutz synthesis)
2CH3-Cl +2Na → C2H6
2. On treating ethanol with excess of concentrated sulfuric acid, it converts into ethene
CH3-CH2-OH ---(conc. H2SO4)----> CH2=CH2 + H2O
In a fractionating column, what process is caused by heating?
Answer:
During the fractional distillation of crude oil: heated crude oil enters a tall fractionating column , which is hot at the bottom and gets cooler towards the top. vapours from the oil rise through the column. vapours condense when they become cool enough.
Hope it helps you :)
The fractionating column's crystal clear glass beads provide such a vast surface area for heated vapors to cool and condensed continuously.
The fractionating column is inserted into the mouth of the distillation flask, which contains the saturated solution to be separated.
Heated crude oil is pumped into a tall fractionating column that is heated at the bottom and cools as it rises.
The oil fumes ascend through the column. When vapors cool down sufficiently, they condense. Various heights are used to lead liquids out of the columns.
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How does the number of protons compare to the number of
electrons in a canton
Answer: The number of protons in cation is more than the number of electrons
Explanation:
cations are positive ions that means that they lose electrons to be stable nd have electron configuration (atomic number ) equivalent to the preceding noble gas
as : sodium 11 , it loses on electron to be stable and its electron configuration is equivalent to neon 10
so ,the number of protons in cation is more than the number of electrons
i hope it helps!
What element is on period 5 group/family 11
Answer:
47
Ag
Silver
107.87
Explanation:
can someone help me convert these please !
An increase in the volume of a substance because of an increase in temperature is called
Answer:
Its called contraction.
Explanation:
How many atoms are in 25.00 g of Li.
Answer:
6.022×1023 atoms
Explanation:
what happened after you add 1 dose of antibiotics to the bacteria
Answer:
Since there's only 1 hour before your next dose, you skip the missed ... It happens when bacteria adapt to withstand one or more antibiotics.
Explanation:
(NH4)3P is it Ionic or Molecular??
Answer: It is molecular
Explanation: The reason it is molecular is because it has no ions in the formula it only has the molecular mass which is the reason why it is in fact molecular
Humans depend on ecosystems for ecosystem services and
resources. For example, this river ecosystem provides water, fish,
and a place to swim. The forest ecosystem provides wood, shade,
and erosion control. Choose a resource and describe the possible
effects of its use on society and on ecosystems throughout its life
cycle.
Explanation:
ok, forest ecosystem always recycle its resources;
dead animals are always returned to the ground, providing fertility of trees & other vegetation for the animals that consume its harvest...this ecosystem provides natural remedies for human ailments, rich soil provides farming, and re using of such, as long as it is not over harvested. The Indians that live there have vast knowledge of their surroundings...