Answer:
true they do I yes they do
20 Points!!
Need it as soon as possible.
Answer:
D.
Explanation:
The reaction is losing potential energy, which means that the reaction is losing that energy as heat. Exothermic is the loss of energy. Therefore it will be D.
Select the correct answer.
Which products are formed during the decomposition of magnesium nitride (Mg3N2)?
A.
Mg + 3N2
B.
3Mg + 2N2
C.
Mg + 3N
D.
3Mg + N2
E.
2Mg + 3N
Answer:
D. 3Mg + N2
Explanation:
magnesium nitride will decompose to form elemental magnesium and nitrogen gas
Mg₃N₂ → Mg + N₂
The reaction now needs to be balanced So that the number of Mg and N atoms in the reactants is equal to that of the products
There are
groups and
periods in the periodic table.
Answer:
I do not understand but,
Explanation:
There are 18 groups, 18 columns, and 118 elements at the time of this response.
Here is a map of the periodic table for any more help that you might need.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
earth is one of the planets in the
Answer:
moon obviously
Explanation:
........
Explain the ratio of calcium ions to chloride ions in CaCl2
Answer:
The ionic formula for Calcium Chloride is
C
a
C
l
2
Calcium is an Alkaline Earth Metal in the second column of the periodic table. This means that calcium has 2 valence electrons it readily gives away in order to seek the stability of the octet. This makes calcium a
C
a
+
2
cation.
Chlorine is a Halogen in the 17th column or
p
5
group.
Chlorine has 7 valence electrons. It needs one electron to make it stable at 8 electrons in its valence shells. This makes chlorine a
C
l
−
1
anion.
Ionic bonds form when the charges between the metal cation and non-metal anion are equal and opposite. This means that two
C
l
−
1
anions will balance with one
C
a
+
2
cation.
This makes the formula for calcium chloride,
C
a
C
l
2
.
I hope this is helpful.
Volcanic eruptions cannot be predicted by scientists.
true or false
Answer:
false
Explanation:
how do we know that a chemical reaction occured
Answer: signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Explanation:
¯\_(ツ)_/¯(⌐■_■)(☞ﾟヮﾟ)☞☜(ﾟヮﾟ☜)
Given the following equation: 2C6H6 + 1502 - 12CO2 + 6H20
How many moles of O2 are needed to react with 4.0 moles of
Co HG?
a 30 moles
b 12 moles
C 4.0 moles
d 24 moles
Answer:
a) 30 moles
Explanation:
2C6H6 + 1502 -------> 12CO2 + 6H20
from reaction 2 mol 15 mol
given 4.0 mol x mol
x = 4.0*15/2 = 30. mol
which value of gas constant (R)use and when ?
in ideal gas equation.
Answer:
R is universal gas constant
It is has fixed value which would depend upon the units in which P,V and T expressed in the equation PV=nRT
R=
nT
PV
Answer:
value of R=0.0821atm,mol-¹k-¹
A new element, Thorsonium, has two isotopes. Thorsonium isotopes have a mass of 255 amu and 257 amu. Given the average atomic mass of Thorsonium is 255.65 amu, calculate the percent abundance for each Thorsonium isotope.
Answer:
255 amu has relative abundance 67.5% and 257 has relative abundance 32.5%
Explanation:
Average atomic mass =sum of product of atomic mass and relative abundance all divided by hundred or total abundance
How much total heat is required to bring 25.0g of ice at ~2.00 C to a liquid at 50.0 C? Please
Answer:
q=m*c*•
Explanation:
•=50-2
m=25
c=4.18
q=?
use this
A student has a cube with each side is 4 cm in length, what is the volume? What is the measurement unit? Select ALL that apply.
Answer:
64cm^3
Explanation:
To get the volume just multiple 4*4*4
1. MnO₂ is an example of what type of bond?
a covalent
b ionic
c polyatomic ion
2. Cl is an example of a cation, anion, or polyatomic ion
a polyatomic ion
b anion
c cation
Answer:
1. covalent
2. polyatomic ion
Explanation:
:)
Answer:
1) b
2)c
Explanation:
How many grams of C are there in 0.234 moles of caffeine?
Solo lo ago para obtener puntos jejeje
3. What might be the formula for calculating speed?
4. What might be the formula for calculating distance?
spe
5. What might be the formula for calculating time?
(m/s)
6. What might be the units for speed?
Answer:
3)The formula for speed is
speed=distance ÷ time
distance is in metres (m)
and time is in seconds (s),
so the units will be in metres per second (m/s).
4)to solve for distance use the formula for distance d = st, or distance equals speed times time. ... You can use the equivalent formula d = rt which means distance equals rate times time. distance = rate x time.
5)To solve for time use the formula for time,
t = d/s which means time equals distance divided by speed.
6)The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour.
please mark me as a brain list
Similes and metaphors are poetic devices. What does this
mean?
Answer:
Both similes and metaphors are a poetic device because authors can be seen using them while writing their poem to give the reader a deeper understanding of the character and the setting. Metaphor is a figure of speech that talks about one this but refers to another. On the other hand, a simile is a figure of speech that compares two things together. Usually using the work "like" or "as".
Hoped it helped! Have a great day!
What is the charge on an electron?
-1
0
+1
+2
Answer:
he charge on an electron is -1. Explanation : Electron is a subatomic particle whose symbol is . The electrical charge on an electron is negative. The electron was discovered by the J.J. Thomson. The mass of an electron is . The charge on electron and proton is equal but opposite. Neutron has zero charge and proton has +1 charge.
Explanation:
Which oxide is used to make red colour glass?
Answer:
Selenium
Explanation:
Do the chemical formulas NO, NO2 and N2O provide the same information in all aspects? Explain.
Answer:
yes they do because is it quite into te aspects of ciencia
how does neutralization reaction help in the remedy of our digestion disorder? clarify
Answer:60
Explanation:
60 is 60 is 69 to the l the b i like eating j wek;gnl
what is a chemical change of a book
be quick
Answer:
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. ... An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
Explanation:
The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories.
What is a major problem with CFCs?
A-it is toxic to breathe.
B-It does not readily break down in the atmosphere.
C-It is a greenhouse gas.
D-It isn't a good refrigerant
what's the difference between viscosity and flow rate
Answer:
Flow rate is how fast a fluid moves. The flow rate can depend on several factors. These factors are the type of fluid that you are using, the force that is pushing on a fluid, the size of the pipe the fluid flows from and the type of surface the fluid flows over. Viscosity is the resistance of a fluid to flow.
Explanation:
just looked it up
PLZ HELP SCHOOL STARTS TMR AND I NEED THIS DONE BY 2NIGHT. ILL GIVE BRAINLIEST
Answer:
Filtration separates solids of different sizes.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
Consider the reaction X + Z ?
Assume the following:
1) The product is an ionic compound.
2) Element X has three valence electrons
3) Element Z needs two valence electrons to have completed s & p subshells (full octet)
What would make the most sense for the formula of the product?
Answer:
X2Z3
Explanation:
Based on the clues, X is a metal and Z is a non-metal.
X could be aluminum and Z would need to be an element from the oxygen family.
two difference between simple cell and dry cell
Explanation:
Simple cell has liquid chemicals and it is difficult to carry from one place to another. Dry cell has no solution. So, it is easier to carry it from one place to another and there is no risk of spilling acid from the dry cell.
Knowing that the molar mass of the compound is 46.069 grams/mole, use the formula weight calculated in part C to
determine the molecular formula.
Select the correct answer from each drop-down menu.
С_H_O_
Answer:
C2H2O1
Explanation:
I got it right on plato :>
C2H6O1 is the correct answer.
how electronegativity relates to polar bonding
There is 1.00 × 102 mg of caffeine in a shot of espresso. The chemical formula of caffeine is C8H10N4O2. Determine the moles of carbon and hydrogen present in the caffeine in one shot of espresso
Answer:
In one shot of expresso, there are:
4.12 x 10^-3 moles of C atoms
5.15 x 10^-3 moles of H atoms
2.06 x 10^-3 moles of N atoms
1.03 x 10^-3 moles of O atoms
The moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
What is mole?A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
6.02 x 1023 chemistry instructors make up a mole. Anytime we want to make a reference to a lot of different things, it is much simpler to type the word "mole" rather than the number "6.02x1023." In essence, it is the reason this specific unit was created.
caffeine in a shot of espresso = 1.00 × 10² mg/1000=0.1g
mole of caffeine =0.1g÷ 194.19g/mol
=5.149× 10⁻⁴mole
moles of carbon =8×5.149× 10⁻⁴
= 4.11× 10⁻³moles
moles of carbon = 10× 5.149× 10⁻⁴
=5.14× 10⁻³moles
Therefore, the moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
To know more about mole, here:
https://brainly.com/question/15209553
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Hey I'm Chloe, Can you Help me Thank you :)
Q: how can you tell if two objects are in thermal equilibrium?
Answer:
Two objects are in thermal equilibrium if they are in close contact that allows either to gain energy from the other, but nevertheless, no net energy is transferred between them. Even when not in contact, they are in thermal equilibrium if, when they are placed in contact, no net energy is transferred between them.
Explanation:
hope this helps chloe
