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
A magnet is different from a piece of iron that is not magnetic because
Answer:
Under normal conditions, a magnetic material like iron doesn't behave like a magnet because the domains don't have a preferred direction of alignment. On the other hand, the domains of a magnet (or a magnetized iron) are all aligned in s specific direction.
Explanation:
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 is a similarity between the respiratory and excretory systems?
A They both break down food.
B They both remove waste from the body.
C They both exchange gases within the body.
D They both transport nutrients throughout the body.
Answer:
B
Explanation:
The respiratory removes carbon, and the excretory removes other waste products
what kind of substance is rust
? + 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
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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Element X has three electrons in its outermost orbit.
Element Y has seven electrons in its outermost orbit.
What is the chemical formula of the ionic compound
formed by these elements when they react together?
(Use X and Y as the chemical symbols.)
Answer:
A has 3 electrons in outermost orbit and B has 6 electrons in its outermost orbits. So A can give three electrons to complete its octet and B need 2 electrons to complete its octet. so 2 atoms of A will release 6 electrons and 3 atoms of B will need six electrons to complete their octet So, the formula will be A2 B3.
The chemical formula of the ionic compound formed by these elements when they react together is X₂⁺Y₃⁻.
What is the chemical formula?A compound's makeup is symbolically represented by its chemical formula. It contains charges, ions, etc.
X has 3 electrons in its furthest outer orbit, while Y has 6 electrons there. In order to complete its octet, X can contribute three electrons, but Y requires two electrons.
So, three atoms of Y will require six electrons to complete their octet, while two atoms of X will release six electrons.
Here, the chemical formula is X₂⁺Y₃⁻, as X is donating an electron so it will gain a positive charge, and Y is gaining an electron, so it will gain a negative charge.
Thus, the chemical formula of the ionic compound is X₂⁺Y₃⁻.
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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:
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.
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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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
(20 points)
Dracens based on the headlines in the newspapers or electronic
mens watched news on television or listened radio nas program about
uwelated comes in the Philippines, write down/create 10 headlines about
drugs
Answer:
Scammer
Explanation:
¯\_(๑´ω｀๑)_/¯
Scammer
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
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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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)
I need help ASAP!!!!!!!!
Answer:
abcdefghijklmnopqrstuvwxyz
Explanation:
I pooped the bed last night when I farted
Convert a measurement of 89 cg to its equivalent in mg
Answer:
1 cg = 10 mg
Explanation:
So, 89cg = 89 * 10 = 890mg!
Pls thank, 5star, and brainliest!
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
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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what atom makes up the end of a pencil
Answer: carbon atoms
Explanation:
carbon atoms because carbon has an atomic mass of 12. Atomic mass is the mass of an atom. It is calculated as the sum of the number of protons and neutrons in the atom, because protons and neutrons make up the majority of the atom's mass.
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
Precipitation falls in these two forms: Solid / Liquid / Gas I’ll give you 77 and read the pdf
Answer:
It falls in Liquid and Solid.
Explanation:
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:
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
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.
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:
6. List the following particles in size order, from
biggest to smallest?
Answer:
the particles, molecules, and gas range from smallest to largest in the following order: electron < proton < atom <...
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
