Answer:
One element takes the place of another in a compound
Explanation:
a p e x - just did the test
The statement best describes a single-replacement reaction as one element takes the place of another in a compound. The correct option is A.
What is a single replacement reaction?A single replacement reaction is one in which when the reaction happens, one element is substituted by another in a compound. It is also called displacement reaction. The replacing material will always be a pure element.
An example is Zn + 2HCl -> ZnCl₂ + H₂
Thus, the correct option is A. one element takes the place of another in a compound.
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Question 13 of 32
Which of the following is a scientific question you could ask about apples?
O A. Do red apples contain the same vitamins as green apples?
B. What type of apple do I like best?
C. How many apples do you need to bake an apple pie?
O D. Are red apples prettier than green apples?
SUBMIT
Answer:
A
Explanation:
this should be obvious if you read it haha
The curved upper surface of a liquid in a column of liquid?
Answer:
The answer would be meniscus.
Explain how the complexity and diversity of living things has changed over time.
Answer:A complex biological structure with many interacting parts might appear, at first glance, as if it were originally created in its present form with all its interlocking components fully formed and intact. It doesn’t seem possible that they developed step by step via biological evolution. In Darwin’s Black Box, Michael Behe introduces a term that he and other proponents of Intelligent Design use for this concept: irreducible complexity. No part of an irreducibly complex system has any apparent function except in its relation to the other parts.
Which statement best describes what happens to the energy of the particles when water vapor begins to cool?
A. The average potential energy decreases.
B. The average kinetic energy decreases.
C. The average potential energy remains the same.
D. The average kinetic energy remains the same.
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the correct option is option B that is average kinetic energy decreases.
What is kinetic energy?It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=1/2mv²
Where,
m= mass of particles
v= velocity of particles
Water vapor condenses when it cools. Water undergoes a phase shift, transitioning from the gas to a liquid. Evaporation is the inverse of condensation. When water vapor begins to cool, average kinetic energy decreases.
Therefore, the correct option is option B.
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An atom with 5 protons, 6 neutrons, and 5 electrons has an atomic mass of __amu. (Enter a whole number.
Numerical Answers Expected!
Answer for Blank 1:
Answer:
3
Explanation:
Which chemical equation is balanced?
OA CO, + H,0 - H,CO,
O8 Mg0+ 2HCI - MgCly + H,0
O0 Ca0, + HCI CaCl, + H,0
O0K H,0- K,0 +H,
The chemical balanced : A and B
Further explanationGiven
Chemical equation
Required
Balanced equation
Solution
A chemical equation is said to be balanced if the number of atoms in the reactants and the number of atoms in the product are the same
a. CO₂+H₂O⇒H₂CO₃
balanced
b. MgO+ 2HCI ⇒ MgCl₂ + H₂O
balanced
c. CaO + HCI ⇒ CaCl₂ + H₂O
the elements H and Cl are not balanced
d. K + H₂O ⇒ K₂O +H₂
element K is not balanced
what is a normal phase of carbon?
the normal phase of carbon is solid
Help please
When you have two
isotopes of an atom, Carbon-12 and Carbon-13 for example, what has changed in the atomic structure?
A. Number of protons
B. Number of electrons
C. Number of neutrons
A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.
Which of the following characteristics can be written only in space B?
Occurs in substances that have at least one non-metal
Occurs in substances that have a repeating lattice structure
Occurs in substances that have discrete molecular structure
Occurs in substances that have high melting points
Ionic and covalent bonds can occur in substances that have a repeating lattice structure.
Ionic and covalent bondsIonic bonds are formed when an atom donates electron (s) to another atom. Covalent bonds, on the other hand, are formed when two atoms share electrons to complete their octet states.
Ionic compounds are formed from a combination of metal and non-metal atoms. They usually have crystalline lattice structures with high melting points.
Covalent compounds are formed between non-metal atoms. They can also have lattice structures but generally have lower melting points because the forces holding the molecules together are weaker.
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Answer:
Occurs in substances that have a repeating lattice structure
Explanation:
Diffraction is a wave property that electrons possess
- true
- false
Answer:
The given statement is "True". A further explanation is provided below.
Explanation:
Diffraction occurs mostly with general noise, with electro-magnetic radioactive material, such as visible region, x-ray, but mostly gamma rays, and with very small moving molecules, such as atomic nuclei, as well as electrons, that also have wavelike characteristics. Yet another side effect of diffraction is because there are no dramatic or rapid shadows.Therefore this obvious response is the right one.
Study the Lewis dot diagram for nitrogen. Explain what is correct and what is incorrect about the diagram. Use details to support your answer.
Answer:
The Lewis dot diagram is supposed to have dots on each side. What's incorrect is that there isn't a dot on the bottom, only the left and right side and the top. What's correct about this is that there are 5 outer valence electrons, and they correctly put 5 dots, even though they're in the wrong place.
Explanation:
The given Lewis dot diagram of nitrogen is correct for the number of valence electrons for nitrogen. However, they are not correctly placed because two of them are lone pairs and only these two are shown as paired. Remaining three electrons have to be represented as single electrons.
What is Lewis dot structure?Lewis dot structure of an element represent its valence electrons shown as dots around the atom. The lone pair of electrons are shown as paired dots and other electrons as single dots.
For compounds, a Lewis diagram shows the bonded and non bonded electrons between bonded atoms. Nitrogen is 7th element and it contains 7 electrons in which 5 are valence electrons.
Nitrogen contains one lone pair of electrons. They have to be shown as paired dots in the Lewis structure. In the given diagram there are two pairs of electrons which is incorrect. Three electrons have to be shown as single dots.
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What will the subscript for NH4 be?
Answer:
2
Explanation:
The subscript on Ammoniumwhich is (NH4) is 2.
Hope this helped!
How do Ionic bods form in binary compounds?
Answer:
Ionic bonding is the complete transfer of valence electron(s) between atoms and is a type of chemical bond that generates two oppositely charged ions. By losing those electrons, these metals can achieve noble-gas configuration and satisfy the octet rule. ...
Explanation:
Which is more acidic – milk of magnesia or lemon juice? What is the difference in acidity between the two? (milk of magnesia = pH 10.5, lemon juice = pH 2.5)
Answer:
Lemon juice because it has more of a sour taste to it than a watery taste like milk
Explanation:
How many atoms are in a sample containing 7 moles of phosphorus?
1. d.4.125 x 10²⁴ atoms
2. c. 487.73 g
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
1. 7 moles of phosphorus, so n=7, then number of atoms :
[tex]\tt N=7\times 6.02\times 10^{23}\\\\N=4.215\times 10^{24}[/tex]
2. 2.5 moles of Pt, so n=2.5, the mass of Pt(MW=195,084 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=2.5\times 195,084\\\\mass=487.73~g[/tex]
PLEASE HELP ME, CHEMISTRY THANKS! :)
The density of water at 4.00°C is 0.967 g/mL. How many molecules of water are present in a 499.8 mL bottle of water? Express your answer to the correct number of significant figures. Be sure to show all steps completed to arrive at the answer.
Answer:
161.69×10²³ molecules
Explanation:
Given data:
Volume of water = 499.8 mL
Density of water = 0.967 g/mL
Number of molecules of water = ?
Solution:
First of all we will calculate the mass of water.
Density = mass/volume
0.967 g/mL = mass/499.8 mL
Mass = 0.967 g/mL × 499.8 mL
Mass = 483.3 g
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 483.30 g / 18 g/mol
Number of moles = 26.85 mol
1 mole contain 6.022×10²³ molecules
26.85 mol ×6.022×10²³ molecules / 1mol
161.69×10²³ molecules
Answer:
density of water at 4.00c is 0.967 g/mL. Volume of water=499.8mL
Mass of water=density x volume= 0.967 x 499.8=483.3066g
Number of moles of water molecules in given of water = givenmass/molarmass=483.3066/18=26.85
we know that 1 mole has 6.022 x 1023 molecules of water
so the number of water=6.022 x 1023 x 26.85=161.69 x 1023 =1.62 x 1025 molecules of water is its upto 3 significant figure.
Explanation:
If the half-life of substance A is 1.5 years, how long would it take an 8.0 gram sample of stances A to decay such that only 1.0 gram remained?
Answer: 4.5 Years
Explanation:
8 -> 4 -> 2 -> 1
Substance goes through 3 Half-Lives
3 Half-Lives x 1.5 Years = 4.5 Years
Answer:
4.5 i think
Explanation:
Compared to compounds with network structures, compounds arranged in molecules (covalent bonds) have ____________ melting points.
Explanation:
.... have lower melting points.
Which of the following describes scientists?
A. People with perfect understanding of science
B. People from different backgrounds
C. People with only one perspective
D. People with similar personalities
Answer:
A. People with perfect understanding of science
how can I identify easliy Amphoteric oxide from basic oxide
Answer:
A general guideline to determine if oxide is acidic, basic, or amphoteric is to use the periodic table. Typically, metals such as Ba form basic oxides (BaO), while nonmetals such as S form acidic oxides (SO3).
The pressure on a 200-milliliter sample of CO2(g) at constant temperature is increased from 60 kPa to 120 kPa. What is the new volume of the gas?
Answer:
100 milliliter
Explanation:
Initial Pressure P1 = 60 kPa
Final Pressure P2 = 120 kPa
Initial Volume V1 = 200mL
Final Volume V2 = ?
These parameters are related by the following boyle's law which is mathematically given as;
V1P1 = V2P2
Making V2 subject of interest;
V2 = V1P1 / P2
inserting the values;
V2 = 200 * 60 / 120
V2 = 100ml
How many grams is 1.700 moles of KCl?
Answer:126.73720999999999
Explanation:
Answer:
126.7 grams/mole of KCl
What is causing the Hot Springs to be so hot? What is causing Hot Springs to be so acidic?
Answer:
Hot springs are hot because of geothermal heat. The Hot springs are acidic because hydrogen sulfide and carbon dioxide get in touch with water they evaporate which causes acid.
Explanation:
What is the name of the compound (NH4)2SO4
140 g of apple contains about
80 Calories (C) of energy. How many
grams of apples would you need to eat
to consume 360 Calories?
How many grams of apple would you need to eat and consume 360 calories
Answer:
630 grams
Explanation:
140/80 = 1.75
360 times 1.75 = 630
Match each item with the correct statement below.
a.
Intramolecular force
d.
Intermolecular forces
b.
tetrahedral
e.
London dispersion Forces (LDFs)
c.
linear
____ 1. An intermolecular force that occurs between two molecules of Br2 is formed by?____
____ 2. Is a force that occurs within molecules and compounds.
____ 3. Dipole – dipole, Hydrogen Bond, and London dispersion Forces are examples of what type of force?
____ 4. Is the molecular shape of HI.
__ 5. the molecular shape of CH4
1. LDFs
2. Intermolecular Forces
3. Intramolecular Forces
4. Linear
5. Tetrahedral
Edit: I'm new to this site and idk how to use it properly. I'm not sure about 2 and 3 currently because these forces are between molecules as well so INTERmolecular would be used twice (?)
HELP ASAP!!! Which two energy transformations are shown in the photo? A. Chemical energy → electromagnetic energy B. Chemical energy → thermal energy C. Thermal energy → electrical energy D. Thermal energy → chemical energy
Answer:
Chemical energy _ thermal energy
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called _____ energy. This quantity is a measure of bond strength since the stronger the bond, the _____ the amount of energy required to break it.
Answer:
Nuclear Binding Energy (Bond Energy), Higher (Greater)
Explanation:
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called Nuclear Binding Energy (Bond Energy). This quantity is a measure of bond strength since the stronger the bond, the Higher (Greater) the amount of energy required to break it.
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called bond energy. This quantity is a measure of bond strength since the stronger the bond, the greater amount of energy required to break it.
I hope this helps!
Please help im tryna finish school
Answer:
A. Wave Height
Explanation:
Using the periodic table, choose the more reactive nonmetal.
Br or As
Answer:
Br
Explanation: