Answer:
c. element
Explanation:
Because gold is its own element, a gold bar is only made of one element.
The smallest unit found in a bar of gold is the nucleus of its atom. The core of an atom is called its nucleus which contains the nucleons protons and neutrons.
What is nucleus?An atom is composed of nucleons and electrons. The core of an atom is called its nucleus. Protons and neutrons are located inside the nucleus. They are called the nucleons.
The electrons are revolving around the nucleus through circular trajectories of fixed energies. Every elements are composed of their atoms. Atoms of different elements combine together to form compounds.
Gold is 79th element in periodic table. It is a transition metal in d-block. As every other elements the smallest unit are atoms where the atomic nuclei are even smaller units.
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what is haber's process?
Answer:
method for procuring ammonia
Explanation:
In the Haber process, atmospheric nitrogen is converted to ammonia by reacting it with hydrogen (H2)
When two objects are touching, thermal
energy transfers from...
hotter to colder substances?
Or
colder to hotter substances?
Answer:
According to the laws of thermodynamics, Molecular movements of particles will tend to move into state of lower energy and this would mean that knowing the vibrational and translational energy of complex molecules will lose and give off energy usually in the form of heat but also sound and other transferable mediums it will tend to become less energetic and this mobile indicative of colder objects, if examining the average Molecular kinetic energy and bond energies of the compounds in question.
the diagram shows a model of the nitrogen cycle. which role do plants play in the nitrogen cycle?
Answer
D
Explanation:
They take up usable forms of nitrogen found in soil
Answer:
d
Explanation:
i took the test
What type of substance is reactant A?
Answer:
A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
Explanation:
what does the zebra mussel do to affect the ecosystem
Answer:
The explanation of the type of situation would be characterized below.
Explanation:
Zebra mussels, therefore, have a direct as well as indirect (significant) impact on natural ecosystems. The much more significant impact is on the feed intake interaction including its mussel. Zebra mussels seem to be opportunistic feeders that analyze approximately one gallon of liquid or more per mussel.What is the chemical name of the compound Cu(NO3)2? Use the list of polyatomic ions and the periodic table to help you answer.
A.
copper nitrate
B.
copper nitride
C.
copper(II) nitrate
D.
copper(IV) nitrate
E.
copper(IV) nitrite
Answer:
C. Copper (II) nitrate
Explanation:
It's an inorganic compound that forms a blue crystalline solid
Ions are the charged species of the atom that carries an extra or less electron. The chemical name of the compound Cu(NO₃)₂ based on polyatomic ions is copper (II) nitrate. Thus, option C is correct.
What is an ionic compound?An ionic compound is a type of chemical compound that is characterized by the presence of the ions or the charged species that results in electrostatic forces leading to the ionic bond formation.
The copper (II) nitrate compound is an example of an ionic compound as the Cu atom is metal and nitrogen and oxygen atoms are the non-metals. The metallic part of the compound carries a +2 charge while the non-metallic part consists of a negative charge.
Therefore, option C. Cu(NO₃)₂ can be named chemically as copper (II) nitrate.
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⚠️⚠️PLEASE HELPP⚠️⚠️
Describe an every day example of an object that has energy of motion and object that has stored energy
Answer:
Humans
Explanation:
Humans have energy of motion and store energy.
Every object will have any form of energy. For instance, when we are walking we gains a kinetic energy. We use electronic devices where electrical energy is stored and can be converted to mechanical energy to activate any motors.
What is energy transformation?Energy can neither be created nor be destroyed. However it can be transformed to any other forms. Thus, the total energy will conserved always.
We have a lot of example for energy transformation and storage. The energy form stored by virtue of the position of an object is called potential energy. Whereas, when the object starts moving potential energy converts to kinetic energy.
Thus, thermal vibrations of particles, our every day activities all are associated with a kinetic energy. Kinetic energy of each body depends on the mass and velocity of the body. The more the mass and velocity more will be the kinetic energy.
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Although I2 is the stable form of iodine at low temperatures, at high temperatures the molecule can dissociate:
Upper I subscript 2 (g) double-headed arrow 2 upper I (g).
What is the equilibrium constant expression for this system?
K subscript e q equals StartFraction StartBracket upper I EndBracket superscript 2 over StartBracket upper I subscript 2 EndBracket EndFraction.
K subscript e q equals StartFraction StartBracket upper I EndBracket over StartBracket upper I subscript 2 EndBracket EndFraction.
K subscript e q equals StartFraction StartBracket upper I subscript 2 EndBracket over StartBracket upper I EndBracket superscript 2.
Answer:
1. A
2. B
3. Left/Reactants
Explanation:
UWU
Answer:
Question 1 : A
Question 2: B
Question 3: In this system, the equilibrium lies to the ✔ left,and the reaction favors the reactants.
Explanation:
Hope this helps.
Edge 2022
If you look up at the night sky long enough, the stars will appear to move across the sky. What is responsible for making the stars appear to move across the sky at night?
A. Earth's Revolution
B. Earth's rotation on its axis
C. Earth's position in its orbit
D. Earth's distance from the sun
1) How many atoms are in Molecules? O One O Exactly two O Two or more O Compounds don't have atoms
Answer:
Two or more!
Explanation:
6CO2 + 6H20 + Energy
Co H1206 + 602
D. heat of reaction
O C. thermal reaction
B. endothermic reaction
A. exothermic reaction
is cellphone is made from renewable resources * true or false
Answer:
T
Explanation:
During a strenuous soccer game, a student is sweating a lot. Which of these would help her maintain her water balance?
A. drinking more water or other fluids
B. wiping off perspiration with a towel
C. increasing breathing and heart rate
D. refraining from drinking any water
Answer:
A
Explanation:
because your body needs to have an intake in the volume of liquids, and when you sweat it secretes the water from your body
What types of inputs and outputs do these cell systems share
Answer:
The inputs of cellular respiration are glucose and oxygen. The outputs of cellular respiration are water, carbon dioxide
The input of cell systems share are glucose and oxygen. The output of cell systems share are carbon dioxide, energy and water.
What is a cell ?The smallest unit that can sustain life on its own and makes up all living things, including the body's tissues. The cell membrane, the nucleus, and the cytoplasm are the three primary components of a cell. The chemicals that enter and leave the cell are governed by the cell membrane, which encloses the cell.
The cell membrane, the nucleus, and the cytoplasm are the three components that make up a cell. Intricate arrangements of microscopic fibers and hundreds or even thousands of tiny, unique structures known as organelles can be found in the cytoplasm.
The system's inputs are the signals or data it receives, and its outputs are the signals or data it sends. As part of an activity, the phrase can also be employed; for example, to "perform I/O" is to carry out an input or output operation.
Thus, The input of cell systems share are glucose and oxygen. The output of cell systems share are carbon dioxide, energy and water.
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10. When carrying out the
experiment with magnesium
and sulphuric acid, why do you
add magnesium until it stops
fizzing?
Answer:
To make sure all the sulphuric acid has been used up
I need help ASAP!!!!!!!!
Answer:
abcdefghijklmnopqrstuvwxyz
Explanation:
I pooped the bed last night when I farted
How many moles of atoms in 22.5 g Zn
Answer: 1 mol of Zn is 65.38g
Explanation: To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn. Hence, 1.34 g of Zn contains 0.020 moles of Zinc.
0.34 mole of atoms in 22.5 g Zn.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn.
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{22.5}{65.38 u}[/tex]
Moles = 0.34 mole
Hence, 0.34 mole of atoms in 22.5 g Zn.
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If scientists had tried to repeat thomosons experiment and found that they could not would thomosons cocnclusion still have been valid?
Answer:
No
Explanation:
The conclusions from Thomoson's claims would be invalid if his experiment could not be replicated.
One of the attributes of a valid experiment in science is replication. That is, an experiment must be repeatable with similar outcomes under similar conditions as the original experiment when independently performed by another scientist. Once an experiment cannot be replicated, the outcomes of such an experiment become invalid in science.
Hence, Thomoson's conclusion would be invalid if his experiment could not be replicated.
Why is it important to know the temperature of the water when dealing with ions in
an aqueous solution?
Water does not ionize at higher temperatures.
Water becomes very acidic when at low temperatures.
Temperature affects the concentration of water.
The ionization constant of water is usually given at 25 °C.
Water at a higher temperature will produce more ions than water at a lower temperature.
Answer:
temperature affects the concentration of water
If a balloon containing 3000 L of gas at 39°C and 99 kPa rises to an altitude where the pressure is 45.5 kPa and the temperature is 16°C,
the volume of the balloon under these new conditions would be calculated using the following conversion factor ratios:
( the one I have marked, I’m not sure if that’s the answer or not )
[tex]\tt =3000~L\times \dfrac{289}{312}\times \dfrac{99}{45.5}[/tex]
Further explanationGiven
3000 L of gas at 39°C and 99 kPa to 45.5 kPa and 16°C,
Required
the new volume
Solution
Combined with Boyle's law and Gay Lussac's law
[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]
T₁ = 39 + 273 = 312
T₂ = 16 + 273 = 289
Input the value :
V₂ = (P₁V₁.T₂)/(P₂.T₁)
V₂ = (99 x 3000 x 289)/(45.5 x 312)
or we can write it as:
V₂ = 3000 L x (289/312) x (99/45.5)
4. How many moles of H, would be
produced from 47 grams of H2SO4?
2A1 +3H,504 → Al2(SO4)3 +3H2
Answer:
0.48 moles of H₂ are produced.
Explanation:
Given data:
Number of moles of H₂ produced = ?
Mass of H₂SO₄ = 47 g
Solution:
Chemical equation:
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
Number of moles of H₂SO₄ :
Number of moles = mass/molar mass
Number of moles = 47 g/ 98 g/mol
Number of moles = 0.48 mol
Now we will compare the moles of H₂SO₄ and H₂
H₂SO₄ : H₂
3 : 3
0.48 : 0.48
Thus, 0.48 moles of H₂ are produced.
A compound has a molar mass of 100 g/mol and the percent composition (by mass) of 65.45% C, 5.45% H, and 29.09% 0. Determine the empirical formula and the molecular formula.
A) CHO and C6H6O6
B) C3H3O and C6H6O2
C) C3HO and C6H2O2
D) CH2O and C4H8O4
E) CH4O and C3H12O3
Answer:
B) C3H3O and C6H6O2
Explanation:
Given data:
Molar mass of compound = 100 g/mol
Percentage of hydrogen = 5.45%
Percentage of carbon = 65.45%
Percentage of oxygen = 29.09%
Empirical formula = ?
Molecular formula = ?
Solution:
Number of gram atoms of H = 5.45 / 1.01 = 5.4
Number of gram atoms of O = 29.09/ 16 = 1.8
Number of gram atoms of C = 65.45 / 12 = 5.5
Atomic ratio:
C : H : O
5.5/1.8 : 5.4/1.8 : 1.8/1.8
3 : 3 : 1
C : H : O = 3 : 3 : 1
Empirical formula is C₃H₃O.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass = 12×3 + 1.01 ×3 + 16×1 = 55.03
n = 100 / 5503
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2 (C₃H₃O)
Molecular formula = C₆H₆O₂
How many milliliters does 80 g of a 2 g/mL density liquid take up?
Answer:
40mL
Explanation:
Given parameters:
Mass of liquid = 80g
Density = 2g/mL
Unknown:
Volume of the liquid = ?
Solution:
Density of a substance is its mass per unit volume.
It is expressed as:
Density = [tex]\frac{mass}{volume}[/tex]
Volume = [tex]\frac{mass}{density }[/tex]
So;
Volume = [tex]\frac{80}{2}[/tex] = 40mL
As a species evolve, they develop ________ and ________ others
3 points
old traits, save
new traits, save
old traits, lose
new traits, lose
Answer:
d
Explanation:
Why chloride described as an extended structure?
Answer:
Explanation:
Examples of extended structures could include sodium chloride or diamonds. Examples of molecular-level models could include drawings, 3D ball and stick structures, or computer representations showing different molecules with different types of atoms.]
Chloride is described as an extended structure because its atoms are arranged following an endless repeating pattern and are of distinct ratio
Crystals and polymers mostly form extended structures as seen in the formation of sodium chloride whereby the ions in the compound are arranged following a repeating pattern. ( i.e. has a giant ionic structure ).
Chloride is a considered an extended structure because in sodium chloride it forms an unending repeated pattern of ions which makes it a perfect example of an extended structure.
Hence we can conclude that Chloride can be described as an extended structure because its atoms are arranged following a repeating pattern and are of distinct ratio.
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When a chemical reaction does not occur, what happens to the atoms of the two substances?
please make it sound like a 7th grdaer would say! <3
Answer:
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Explanation:
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What will happen if you add salt to water that is "saturated"? *
The salt will react with the water quicker because you're adding more reactants.
The added salt will sink to the bottom.
The salt will dissolve more slowly than usual.
Dissolved salt will precipitate out and sink to the bottom.
Answer:
The added salt will sink to the bottom
Explanation:
A saturated solution is that solution that contains the maximum amount of solute it can dissolve and ,hence, will no longer dissolve any more solute. This question is describing a water solution that is "saturated", this means that water can no longer dissolve any more solute because it has reached the maximum solute limit it can contain.
Hence, adding more solute to a saturated solution like the WATER being described in this question will result in the solute forming a PRECIPITATE at the bottom of the solution. Hence, in this water solution, adding salt to the saturated water solution will result in the added salt sinking to the bottom.
1.State the relationship between the following properties:
a) mass and number of moles__________
b) number of moles and number of particles __________
6. Show how you will compute for the number of particles given the following:
a) Mass of the sample__________
b) Number of moles of the sample__________
Thankyouu po sana my mag answer
Answer:
bytbyufvguv vvg uggy yvgu vgu gyu7yng8ugng88yn
PLEASE HELP ME RNNNN!!! A specific characteristic, such as blue eyes, is known as a *
Answer:
A trait is a specific characteristic of an organism. Traits can be determined by genes or the environment, or more commonly by interactions between them. The genetic contribution to a trait is called the genotype.
Explanation:
if not then its a feature,
? + HCl -> FeCl2 + ?
CaO + ? -> Ca(NO3)2 + ?
? + Cu(OH)2 -> CuCl2 + ?
Answer:
1. Fe / H2
2. HNO3 / H2O
3. HCI / H2O
Answer:
1. Fe / H2
2. HNO3 / H2O
3. HCI / H2O
