Answer:
1. Alchemy
2.Alloy
3.Atom
4.Compound
5. Element
6. Metal
7. Non metal
Explanation:
1. An ancient study or art which attempted to combine science and philosophy to solve worldly problems is alchemy
2. A homogeneous mixture of elements with metals to form metallic solids is an alloy
3. The simplest unit of an element that still retains the properties of that element compound is an atom.
4. Two or more elements joined together such that the elements have lost their individual identity element is called a compound
5. A primary substance that cannot be divided into separate substance is an element
6. The group of elements that are good conductors of electricity and heat is called a metal
7. The group of elements that are poor conductors of electricity and heat are called non metals.
hi help me pls I don't know how to do this
O - Oxide
N - Nitride
Cl - Chloride
Br - Bromide
Sulfide - S^2-
Iodide - I^-
Phosphide - P^3-
Flouride - F^-
When you have a non-metal, it ends in -ide when you place it into a chemical bond. These are all diatomic molecules (apart from phosphorus) and as such you take the element name, remove the suffix, and add -ide. When converting back, look at the electronegativity levels on your periodic table in the upper right corner of each element. (if you don't have them, google "nyc regents chemistry reference table" and go to page 6 of the first result.) The first charge in that spot is what the charge will be.
When a cylinder of helium gas is left standing in the sun, the temperature of the helium reaches 31.5C. The cylinder has a volume of 60.0 L and contains 0.020 mol of helium. What is the pressure in atmospheres inside the cylinder? What is the value for R for this problem?
Answer:
The pressure inside the cylinder is [tex]8.327\times 10^{-3}[/tex] atmospheres.
The value for R for this problem is 0.082 atmosphere-liters per mol-Kelvin.
Explanation:
Let suppose that helium gas inside the cylinder behaves as an ideal gas, the equation of state for the ideal gas is:
[tex]P\cdot V = n\cdot R_{u}\cdot T[/tex] (1)
Where:
[tex]P[/tex] - Pressure, measured in atmospheres.
[tex]V[/tex] - Volume, measured in liters.
[tex]n[/tex] - Molar quantity, measured in moles.
[tex]T[/tex] - Temperature, measured in Kelvin.
[tex]R_{u}[/tex] - Ideal gas, measured in atmosphere-liters per mole-Kelvin.
If we know that [tex]V = 60\,L[/tex], [tex]n = 0.020\,mol[/tex], [tex]T = 304.65\,K[/tex] and [tex]R_{u} = 0.082\,\frac{atm\cdot L}{mol\cdot K}[/tex], then the pressured inside the cylinder is:
[tex]P = \frac{n\cdot R_{u}\cdot T}{V}[/tex]
[tex]P = \frac{(0.020\,mol)\cdot \left(0.082\,\frac{atm\cdot L}{mol\cdot K}\right)\cdot (304.65\,K) }{60\,L}[/tex]
[tex]P = 8.327\times 10^{-3}\,atm[/tex]
The pressure inside the cylinder is [tex]8.327\times 10^{-3}[/tex] atmospheres.
The value for R for this problem is 0.082 atmosphere-liters per mol-Kelvin.
Please help!
A chemical _________________ represents what happens in a chemical
reaction.
A.) Conservation
B.) Product
C.) Equal
D.) Reactant
E.) Equation
F.) Rearranged
Answer:
it is D. Reactant
Explanation:
Answer:
D
Explanation:
A chemical reaction is a process in which one or more substances, also called reactants.
Please help i don’t know what to say
Answer:
Explanation:
Groundwater spread over the years
What is the missing word? When biofuels are burned they release the same amount of carbon dioxide as was removed from the atmosphere
by the plant. Biofuels are therefore described as being carbon___
Answer:
Many scientists view biofuels as inherently carbon-neutral: they assume the carbon dioxide (CO2) plants absorb from the air as they grow completely offsets, or “neutralizes,” the CO2 emitted when fuels made from plants burn.
Explanation:
put in your own words, happy to help
To solve such this we must know the concept of combustion reaction. Therefore, the missing word is neutral that is Biofuels are therefore described as being carbon neutral.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
When biofuels are burned they release the same amount of carbon dioxide as was removed from the atmosphere by the plant. Biofuels are therefore described as being carbon neutral. the products of combustion reaction are carbon dioxide and water.
Therefore, the missing word is neutral.
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In a titration of a solution of unknown concentration of calcium hydroxide against hydrochloric acid (concentration 0.9mol/dm3), 25cm3 of calcium hydroxide was neutralised by 22.5cm3 of hydrochloric acid. Calculate the concentration of the calcium hydroxide solution.
Ca(OH)2 + 2HCl -> CaCl2 + 2H2O
Mixing salt with water is an example of a _________change. *
physical change
chemical change
Answer:
physical
Explanation:
no chemical reaction is happening
In the ground state, which atom has a completely filled valence electron shell?
Answer:
The noble gases(neon, helium, argon)
Explanation:
In the ground state, noble gas atom has a completely filled valence electron shell. Space makes up the majority of an atom.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.
Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense. In the ground state, noble gas atom has a completely filled valence electron shell.
Therefore, in the ground state, noble gas atom has a completely filled valence electron shell.
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PLZ HELP GIVING BRAINLEST TO WHOEVER HELPS ME AND GETS THE RIGHT ANSWER
What kind of energy is light considered to be?
1. Radiant
2. Sound
3. Potential
4. Chemical
Answer:
radiant
Explanation:
Radiant Energy
This should do it.
How to know when a line spectrum is produced.
A line spectrum is produced when the electron moves from one energy level ___. Fill in the blank PLEASE HELP I WILL GIVE BRAINLEST AND GIVE 5 STAR FOR FIRST RIGHT ANSWER
Answer:
A line spectrum is produced when the electron moves from one energy level to a lower energy level.
Answer:
Explanation:
...from one energy level to a lower energy level
What is the volume of a balloon containing 0.75 moles of gas at STP?
Answer:
V = 16.81 L
Explanation:
Given data:
Number of moles = 0.75 mol
Temperature = standard = 273 K
Pressure = 1 atm
Volume of balloon = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will rearrange the formula.
V = nRT/P
V = 0.75 mol ×0.0821 atm.L/mol.K ×273 K / 1 atm
V = 16.81 atm.L/ 1 atm
V = 16.81 L
GIVING BRAINLEST TO WHOEVER HAS THE RIGHT ANSWER! Plz and thx
Food and fossil fuels are considered to be sources of________ energy
1. Mechanical
2.Light
3.Nuclear
4. Chemical
Answer:
Nuclear energy
I'm not sure ok.. Better ask some adult for making sure.
The compound FeCl3 is made of
three molecules of iron chloride.
one atom of iron and three atoms of carbon.
one atom of iron and three atoms of chlorine.
two atoms of iodine, one atom of iron, and one atom of carbon.
Answer:
one atom of iron and three atoms of chlorine.
Explanation:
I just took the test and made a 100 and im really good that this because it so easy.
The compound FeCl₃ is made of one atom of iron and three atoms of chlorine.
Let's consider the chemical formula for iron (III) chloride: FeCl₃.
Fe stands for iron and its subscript (1) means that there is 1 atom in the molecule.Cl stands for chlorine and its subscript (3) means that there are 3 atoms in the molecule.Let's consider which of the following is true for iron (III) chloride.
The compound FeCl₃ is made of:
three molecules of iron chloride. FALSE. It is made by 1 molecule of iron (III) chloride. one atom of iron and three atoms of carbon. FALSE. There is no carbon in the molecule. one atom of iron and three atoms of chlorine. TRUE. two atoms of iodine, one atom of iron, and one atom of carbon. FALSE. There is no iodine in the molecule.The compound FeCl₃ is made of one atom of iron and three atoms of chlorine.
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What is the mass of 2.23 x 1023 atoms of sulfur?
Answer:
11.9 g S
General Formulas and Concepts:
Chem
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Dimensional AnalysisExplanation:
Step 1: Define
2.23 × 10²³ atoms S
Step 2: Define conversions
Avogadro's Number
Molar Mass of S - 32.07 g/mol
Step 3: Dimensional Analysis
[tex]2.23 \cdot 10^{23} \ atoms \ S(\frac{1 \ mol \ S}{6.022 \cdot 10^{23} \ atoms \ S} )(\frac{32.07 \ g \ S}{1 \ mol \ S} )[/tex] = 11.8758 g S
Step 4: Check
We are given 3 sig figs. Follow sig fig rules.
11.8758 g S ≈ 11.9 g S
Which element is oxidized in the reaction below?
2Na+ Br2 → 2NaBr
Answer:
Bromine
Explanation:
Br2 is an oxidizing agent, Na is a reducing agent.
Assignment
Name the type of bond present in each of the following
compounds
Aluminium Oxide ,Al3 O₂)
Answer:
[tex]\boxed {\boxed {\sf Ionic \ bond}}[/tex]
Explanation:
First, let's look at the Periodic Table.
We see that aluminum is a metal, while oxygen is a non-metal.
Now, let's recall three types of bonds
Ionic: typically forms between a metal and a non-metal Covalent: usually forms between non-metals Metallic: tends to form with metalsSince we have a metal (Al) and a non-metal (O), aluminum oxide must have an ionic bond.
Which of the following would be a clue that rock is igneous?
A.It has crystals.
B.It has a complete fossil in it.
C.It has bands.
D.It is very soft.
Answer:
A is the answer to your question
They usually have crystals since they are formed from lava
Please help me out with these questions please..
Both are in 1 picture:)
Answer:
1. B
2. C
Explanation: The law that the properties of the elements are periodic functions of their atomic numbers. And the second one is, most of the air we breathe is made of oxygen.
A LA TEMPERATURA DE 35°C, UNA MUESTRA DE DIOXIDO DE CARBONO OCUPA UN VOLUMEN DE 350 ML. ¿Qué CAMBIO DE VOLUMEN SE PRODUCIRA SI LA TEMPERATURA DESCIENDE A 15°C?
Answer:
New volume = 150 mL
Explanation:
Initial temperature, T₁ = 35°C
Initial volume, V₁ = 350 mL
We need to find the change in volume when the temperature drops to 15°C.
The relation between the temperature and the volume is given by Charle's law. Let new volume is V₂. It can be given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{350\times 15}{35}\\\\V_2=150\ mL[/tex]
So, the new volume is 150 mL.
Aqueous solutions of ammonium sulfide and potassium hydroxide are mixed.
Precipitate:
Chemical Equation:
Complete Ionic Equation:
Net Ionic Equation:
Answer:
Chemical Equation: (NH4)2S(aq) + 2KOH(aq) -> K2S(aq) + 2NH4OH(s)
Complete Ionic Equation: 2NH4^+(aq) + S^2-(aq) + 2K^+(aq) 2OH^-(aq) -> 2K^+(aq) + S^2- (aq) + 2NH4OH(s) 2NH4^+(aq) + OH^-(aq) -> NH4OH(s)
Explanation:
HELPPPP!!!! SCIENCE!!!!
Answer:
Both are only physical changes
A cube of iron with dimensions of 3.0 cm by 3.0 cm by 3.0 cm has a mass of 212 grams. What
is the density of the iron?
Answer:
7.85 g/cm³
Explanation:
Density is Mass/Volume
The mass is 212 grams
The volume is 27 cm³ (3 x 3 x 3 = 27)
212/27 = 7.851851852
We can estimate this to 7.85 g/cm³
Density is simply defined as the mass of a substance per unit volume of substance. It is expressed mathematically as:
[tex]Density = \frac{Mass }{Volume }[/tex]
To solve the question given above, we'll begin by calculating the volume of the iron. This can be obtained as follow:
Dimension = 3.0 cm by 3.0 cm by 3.0 cm
Volume = 3 × 3 × 3
Volume = 27 cm³Thus, the volume of the iron is 27 cm³
Finally, we shall determine the density of the iron as follow:
Mass of iron = 212 g
Volume of iron = 27 cm³
Density =?[tex]Density = \frac{Mass}{Volume } \\\\Density = \frac{212}{27}[/tex]
Density = 7.85 g/cm³Therefore, the density of the iron is 7.85 g/cm³
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How many electrons are in a chromium(III) ion, Cr3+?
Answer:
24 electrons
Explanation:
In order to write the Chromium electron configuration we first need to know the number of electrons for the Cr atom (there are 24 electrons). Once we have the configuration for Cr, the ions are simple.
I hope this is correct!
. One mole of N2O4 contains ___________.
help on this question
Answer:
A
Explanation:
Hopefully this helps.
Describe the trends in electron configuration in the periodic table by selecting the terms from the drop-down menus.
The number of valence electrons
from the left to right across a period.
The number of valence electrons
from the top to the bottom of a group.
Electrons are added into the outermost
in Groups 1 and 2.
Electrons are added in the outermost
in Groups 3 through 12.
Electrons are added in the outermost
in Groups 13 through 18.
The trends in electron configuration in the periodic table can be explained in the given way.
The number of valence electrons:
Increases from left to right across a period.
Remains the same from the top to the bottom of a group.
Electrons are added into the outermost:
In Groups 1 and 2 (Alkali metals and Alkaline earth metals).
Electrons are added in the outermost:
In Groups 3 through 12 (Transition metals).
Electrons are added in the outermost:
In Groups 13 through 18 (Boron group through Noble gases).
Hence, the trends in electron configuration in the periodic table are discussed above.
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A substance that forms hydroxide ions in a water solution is a base.
A. True
B. False
Answer:
True
Explanation:
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What are the two main ways that waves can cause weathering and erosion?
A.
force and deposition
B.
cracking and smacking
C.
impact and abrasion
D.
abrasion and plucking
Answer:
its A
Explanation:
What type of battery is your flashlight battery?
voltaic piles
dry cell batteries
lead-acid batteries
wet cell batteries
A "cell" might be a better name for the torch battery. A "battery" is a collection of connected cells. Another example of an electric cell is a lemon with two strips of different metals (for instance, zinc & copper) inserted into it. The correct option is B.
A primary cell in a dry-cell battery is one that cannot be recycled. Each dry-cell battery has a cathode and an anode for operation. Remote controls, clocks, and calculators are a few examples of modern-day items that employ dry-cell batteries.
Alkaline and lithium batteries are the two most typical types found in flashlights. A "dry" cell used in a torch has a finite lifespan.
Thus the correct option is B.
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According to the collision theory, which is required for a high number of effective collisions?
a very low amount of force from colliding molecules
a very low amount of kinetic energy from colliding molecules
molecular collisions that have very specific orientations
molecular collisions with energy to overcome activation energy
Answer:
molecular collisions that have very specific orientations
Explanation:
Based on the collision theory, a high frequency of effective collision is dependent on the molecular collisions that have very specific orientations.
The collision theory suggests that for reactions to occur, there must collision between reacting particles. The number of collision is dependent on the number of collision per unit time as well as fractions of effective collision. To attain effective collision, colliding particles must be properly oriented to give the desired product.Answer:
C. molecular collisions that have very specific orientations
Explanation: