These are reactions that transfer energy to the surroundings (ie the energy exits from the reaction, hence the name exothermic). The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter. A thermometer is used to detect the temperature increase.
Examples:
Combustion
Neutralisation between acids and alkali
Endothermic reactionsThese are reactions that take in energy from the surroundings (ie energy enters the reaction, which will help you to remember the name endothermic). The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become colder. A thermometer is used to detect the temperature decrease.
Example:
Electrolysis
4.) What is atomic number.
Answer: the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
Explanation:
Kito puts his spoon into a helping of fresh, hot, mashed potatoes as shown in the figure. Which process takes place when the two objects come together
A. The temperature of the spoon increases, but its thermal energy does not change
B. Energy in the form of heat is transferred from the warmer mashed potatoes to the cooler spoon
C. The thermal energy of both the mashed potatoes and the spoon increases as energy in the form of heat is transferred between them
(please answer quickly, I don't want to fail this test due to being stuck on this one)
Answer:
B. is the answer
Explanation:
Energy in form of heat is transferred from the warmer mashed potatoes to the cooler spoon.
Moles of C2H6 in 3.75×10^23 molecules of C2 H6
Answer:
0.623 moles of C2H6
Explanation:
Divide by Avogadro's number (6.022x10^23)
1) How many moles of water does 6.02 x 1023 molecules
represent?
Answer:
1.00 mol
Explanation:
Step 1: Given data
Molecules of water: 6.02 × 10²³ molecules
Step 2: Calculate the number of moles corresponding to 6.02 × 10²³ molecules of water
In order to convert molecules to moles, we need a conversion factor. In this case, we will use Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.
6.02 × 10²³ molecules × 1 mol/6.02 × 10²³ molecules = 1.00 mol (we keep 3 significant figures)
Why is Pluto a dwarf planet?
Group of answer choices
A) it can't clear its orbital path of smaller objects
B) its not round
C) its too far away from the sun
D) it doesn't orbit the sun
Student was identifying the formula of 1 mole of unknown powder. When it was placed on a scale, it was reading 399.91 g/mol. Which of
the following compounds can it be?
A AI(NO3)3
B. C3H8
C. Fe2(SO4)3
D. CaCl2
Answer: The compound is [tex]Fe_2(SO_4)_3[/tex]
Explanation:
Molar mass is defined as the mass in grams of 1 mole of a substance.
S.I Unit of Molar mass is gram per mole and it is represented as g/mol.
A. 1 mole of [tex]Al(NO_3)_3[/tex] weighs = 26.98(1)+14.01(3)+15.99(9) =212.99 g/mol
B. 1 mole of [tex]C_3H_8[/tex] weighs = 12.01(3)+1.007(8) = 44.1 g/mol
C. 1 mole of [tex]Fe_2(SO_4)_3[/tex] weighs = 55.84(2)+32.06(3)+15.99(12) = 399.91 g/mol
D. 1 mole of [tex]CaCl_2[/tex] weighs = 40.07(1)+35.5(2)= 110.98 g/mol
Thus the compound is [tex]Fe_2(SO_4)_3[/tex]
In the formation of sodium chloride by the combination of
sodium and chlorine:
Answer:
Na(s) + Cl2(g) = NaCl(s)
Which name for an ionic compound is
incorrect?
Chromium(IID fluoride (for CrF3 )
Copper(ID) oxide (for Cuo)
Potassium(I bromide (for KBr)
Answer:
no se ingles todavía no aprendo a hablar inglés ya si estuvieran en español los respondia
Explain why Thorium-229 is radioactive
Answer:
Thorium-229 is a very insoluble metal that emits radioactive alpha particles. It is generated by the decay of uranium-233 and has a half-life of 7.340 years.
Explanation:
braliyest please
If you were to compare a cell to the human body, what organ in the body would have a similar responsibility to the cells nucleus?
1. How many atoms are in 2.15 moles of water?
*2. How many atoms of copper are in 12.0 grams?
*3. How many moles of NH3 contain 1.75 x 10^24 molecules of?
4. Determine the number of molecules in 16.75 g of H2O ?
5. Find the formula for a hydrate with 48.8% MgSO4 & 51.2% H2O
6. What is the % by mass of C in Pb(C2H3O2)2?
(Questions with stars just don't make sense to me.)
1.29×10²⁴ atoms are in 2.15 moles of water. Atom is also the smallest piece of substance with chemical element-like characteristics.
What is atom?The smallest unit of matter that may be divided without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The rest is made up of a cloud of electrons that are negatively charged surrounding a nucleus that is positively charged made up of protons and neutrons. The behaviour of the electron in an atom can be compared to that of particles surrounding the nucleus.
number of atoms = number of moles ×6.022×10²³
= 2.15×6.022×10²³
= 1.29×10²⁴
Therefore, 1.29×10²⁴ atoms are in 2.15 moles of water.
To know more about atom, here:
https://brainly.com/question/29712157
#SPJ3
in terms of electrons, what is the difference between a covalent and ionic bond
Answer:
An ionic bond essentially donates an electron to the other atom participating in the bond, while electrons in a covalent bond are shared equally between the atoms. Ionic bonds form between a metal and a nonmetal. Covalent bonds form between two nonmetals
What property of water is primary for living organisms? (SC.6.E.7.4) *
1 point
It is odorless.
It does not conduct electricity.
It is tasteless
It is liquid at most temperatures on Earth.
Answer:
It is liquid at most temperatures on Earth.
bromine
+
calcium iodide ® calcium bromide + iodine
Answer:
Br2 + CaI2 = CaBr2 + I2
Explanation:
Disclaimer: Not sure what you're asking, however, I will provide you with the full balanced equation.
Br2 + CaI2 = CaBr2 + I2
12 and 24
a. GCF
b. LCM
a.12= 2^2*3
24= 2^3*3
GCF= smallest power of each common factor
GCF= 2^2*3
GCF= 12
b. 12= 2^2*3
24= 2^3*3
LCM = greatest power of each factor involved
LCM= 2^3*3
LCM= 24
Help plzzz I don’t get to
Look at the diagram of a fuel cell below.
Which parts of the fuel cell do A and B represent?
A. air
B. anode and cathode
C. electrolyte
D. hydrogen and nitrogen
What does a branching tree diagram show?
A. The evolution in the size of organisms
B. The order in which specific traits may have evolved
C. The animal population in a specific time period
D. The rate of extinction of specific traits in living organisms
Answer:
B. The order in which specific traits may have evolved
Explanation:
yo why do females have to be so heartless to a guy who really put they all in for her?
Answer:
ikr
Explanation:
♂️ it's really sad
Answer:
sometimes the female doesn't want to be hurt, or it could be from the last relationship she was in. maybe just maybe the female feels like you are using her for her body or just to use her. Sometimes females want to stop the heartache before it begins. Tbh we all have different reasons for it.
Explanation:
6.00 moles of sodium perchlorate contains the same number of atoms as __________. 6.00 moles of sodium perchlorate contains the same number of atoms as __________. 6.00 moles of sodium permanganate 6.00 moles of strontium oxide 6.00 moles of sodium cyanide 6.00 moles of lithium phosphate 6.00 moles of sodium nitrite
Answer:
6.00 moles of sodium permanganate
Explanation:
Let us attempt to count the number of atoms present in sodium perchlorate. The formula of the compound is NaClO4
Sodium atoms - 1
Chlorine atoms - 1
Oxygen atoms -4
Total number of atoms = 6
Among the options, only KMnO4 also has six atoms. One atom of potassium, one atom of manganese and four atoms of oxygen.
6.00 moles of sodium perchlorate contains the same number of atoms as: A. 6.00 moles of sodium permanganate.
How to calculate the number of atoms.First of all, we would determine the chemical formula and the number of atoms contained in each chemical compound as follows:
For sodium perchlorate:
Sodium perchlorate = [tex]NaClO_4[/tex]
[tex]NaClO_4[/tex] = [tex]1+1+2[/tex] = 6 atoms.
For sodium permanganate:
Sodium permanganate = [tex]KMnO_4[/tex]
[tex]KMnO_4[/tex] = [tex]1+1+2[/tex] = 6 atoms.
For strontium oxide:
Strontium oxide = [tex]SrO[/tex]
[tex]SrO[/tex] = [tex]1+1[/tex] = 2 atoms.
In conclusion, we can deduce that 6.00 moles of sodium perchlorate contains the same number of atoms as 6.00 moles of sodium permanganate.
Read more on number of moles here: https://brainly.com/question/3173452
Which three observations are caused by plate tectonics?
Answer:
B. HOPE THIS HELPED SENSI
Explanation:
Which is larger in A and B
Answer:
Here is the answer ⬆️⬆️⬆️⬆️⬆️
Styrofoam has a density of 0.075 g/mL. What is the volume of 21.80 g of Styrofoam?
The answer is 290.66 mL
Explanation:
The density of any substance including styrofoam is determined by two main factors: mass (atoms in the substance) and volume (space occupied). Moreover, the volume or mass of the substance can be calculated by using the density as these variables are related. Below I show the process:
density = mass / volume
mass = density x volume
volume = mass / density
volume = 21.80 g / 0.075 g/mL
volume = 290.66 mL
Which process is an example of a physical change?
Answer:Examples of physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting
Explanation:
HELP ASAP!!!
An ionic compound in the solid state has a defined, repeating arrangement of atoms, which is called
A) crystal lattice.
B) atomic structure.
C) electronic structure.
D) molecular structure.
Answer the following questions
Answer:
silk are the answer of the question
Subscripts are the big numbers written to the left of a chemical formula in a chemical equation
True or false
Answer:
Most probably it's true.
calculate the ph of a solution with a [H 3 0+]=7.2×10-8 M
Answer:
pH = 7.14.
Explanation:
Hello there!
In this case, since the pH of a solution is computed via the negative logarithm of the concentration of hydrogen ions:
[tex]pH=-log([H_3O^+])[/tex]
Therefore, we plug in the given concentration to obtain:
[tex]pH=-log(7.2x10^{-8})\\\\pH=7.14[/tex]
Which is a nearly-neutral solution.
Faries in the stolen child are significant because
Can someone help me over here? I need an negative charge and also another thing is that in a question it asked me to use something that would represent an ion. I’m not sure on what to choose either Hydrogen or Helium but just please send help.
Answer:
You could use a hydrogen anion which has 2 electrons.
Explanation:
An ion is an atom or molecule with a net electric charge because it has more or less electrons compared to the original atom or molecule.
An anion is a negatively charged ion.
A cation is a positively charged ion.
Normally a hydrogen atom has one proton and one electron.
So a hydrogen anion (H-) means that it has one proton and two electrons, which means the positive charge will be +1 and the negative charge will be -2.
Ultimately, giving the entire molecule a net charge of -1 because -2+1 = -1.
(I hope this helps! I am not 100% sure what's the format of this question. Like is it interactive? online? Did you draw all those electrons on the diagram? or were they given? Are the numbers given as well? or did you type those in? So I just tried my best to give you something that might work.)