Answer:
which of the following formulas represent a covalent molecule?
A)CaS
B)Co2
C)Na2O
D)FeCl3
stare the classes of elements involved in covalent compounds
Answer:
h2o,H,O are some of the elements
Why is baking soda a necessary ingredient in some cake recipes?
A. It adds heat to the cake.
B. It causes cakes to stay flat and even.
C. It neutralizes acids.
D. It acts slowly to release acids.
Answer:
c
Explanation:
took it
Explain how you can determine if an object is accelerating. Give two examples
Answer:Acceleration has to do with changing how fast an object is moving If an object is not changing its velocity, then the object is not accelerating. Anytime an object's velocity is changing, the object is said to be accelerating it has an acceleration.
Explanation:
What force causes a ball to move
Answer: aerodynamic force
Explanation:
The time-varying aerodynamic force causes the ball to move erratically. This motion is the source of the "dancing" knuckleball that confuses both batters and catchers alike.
which anion forms a neutral compound when combined with a group 2 monatomic cation in a 1:1 ratio?
A) Fluoride.
B)Nitrate.
C)Phosphide.
D)Sulfide.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option D that is sulfide.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion. Ionic compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The valency of group 2 element is +2 so, the anion that is required to form a compound with these element in a 1:1 ratio must have valency of -2. the only anion in th given option which have -2 valency is sulfide.
Therefore, the correct option is option D that is sulfide.
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Which of the following is always equal to the number of protons in an atom 1pc
of a given element?
Mass number
Olonic number
O Atomic number
Answer:
[tex]\huge\mathfrak\purple{answer..} \\ \\ \huge\mathfrak\green{atomic \: number} \\ \\ \huge\mathfrak\red{hope \: it \: helps...}[/tex]
Determine the freezing point and boiling point of a solution that has 68.4 g of sucrose
(C12H22011) dissolved in 100.g of water?
Answer:
Freezing T° of solution = - 3.72°C
Boiling T° of solution = 101.02°C
Explanation:
To solve this we apply colligative properties. Firstly, freezing point depression:
ΔT = Kf . m . i
ΔT = Freezing T° of pure solvent - Freezing T° of solution
Kf = Cryoscopic constant, for water is 1.86 °C/m
m = molality (moles of solute in 1kg of solvent)
i = Ions dissolved in solution
Our solute is sucrose, an organic compound so no ions are defined. i = 1.
Let's determine the moles: 68.4 g . 1mol/ 342g = 0.2 moles
molality = 0.2 mol / 0.1kg of water = 2 m
We replace data: ΔT = 1.86°C/m . 2m . 1
Freezing T° of solution = - 3.72°C
Now, we apply elevation of boiling point: ΔT = Kb . m . i
ΔT = Boiling T° of solution - Boiling T° of pure solvent
Kf = Ebulloscopic constant, for water is 0.512 °C/m
We replace:
Boiling T° of solution - Boiling T° of pure solvent = 0.512 °C/m . 2 . 1
Boiling T° of solution = 0.512 °C/m . 2 . 1 + 100°C → 101.02°C
how do you solve a stoichiometry?
Answer:
Explanation:
Although stochiometry is very scary loking math it is very easy and and fun to learn.
First Balance the chemical equation (Meaning there are equal amounts of elements at end and begining
Second Convert your units to mols
mols are what allows for stochiometry math to work to know how to find the mols takes practice and knowing when to write the math.
Then from there is just knowing how to go from grams to kg or g to mg and etc
Please balance this equation.
Answer:
C2H5OH + 3O2 → 2CO2 + 3H2O
Explanation:
-Identify the following whether it is Physical or Chemical change.
1. freezing
6. burning of paper
2. burning wood
7. digestion of food
3. melted ice cream
8. evaporation
4. boiling water
9. sublimation
5. condensation
10. Exploding firecrackers
My answers are by the way they are written p-phy c-che
pcccpppppc12.7 grams of magnesium chloride is dissolved into water in a flask and set aside for an experiment. The scientist forgets about the solution and the sunlight evaporates it. She needs at least 11 grams of magnesium chloride to continue the experiment. Will she be able to recover enough magnesium chloride from the original flask to continue the experiment
Answer:
Yes, she will be able to recover enough magnesium chloride from the original flask to continue the experiment
Explanation:
The solution prepared by the scientist contains 12.7g of magnesium chloride. The sunlight will evaporate only the water present. When the volume decreases, the magnesium chloride precipitates. When all water evaporates, all the solute, magnesium chloride precipitates totally.
That means she will recover the 12.7g of magnesium chloride.
Answer: Yes, she will be able to recover 12.7g in the flask
Explanation: Founders Educere answer
PLEASE HELP
How many moles of silane gas (SiH4) are present in 8.68 mL
measured at 18 0C and 1.50 atm?
Answer: There are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.
Explanation:
Given: Volume = 8.68 mL (1 mL = 0.001 L) = [tex]8.68 \times 10^{-3} L[/tex],
Temperature = [tex]18^{o}C = (18 + 273) K = 291 K[/tex],
Pressure = 1.50 atm
The ideal gas formula is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\1.50 atm \times 8.68 \times 10^{-3} L = n \times 0.0821 L atm/mol K \times 291 K\\n = \frac{1.50 atm \times 8.68 \times 10^{-3} L}{0.0821 L atm/mol K \times 291 K}\\= \frac{0.01302}{23.8911}\\= 0.00054 mol[/tex]
Thus, we can conclude that there are 0.00054 moles of silane gas (SiH4) are present in 8.68 mL measured at 18 0C and 1.50 atm.
HELP!!!
Help,help,help,help,help, Help,help,help,help,help, Help,help,help,help,help, Help,help,help,help,help, Help,help,help,help,help, Help,help,help,help,help…
Answer:
no
Explanation:
SI unit is 10 times smaller than the next smallest unit. Ture or false?
Answer:
the answer is true
please mark brainlist
What is the name of this molecule?
O A. Butane
O B. Propane
O C. Propene
O D. Butene
The molecule represented below is Butane.
Important things to know about Butane Butane is an organic compound consisting of 4 carbon atoms. it is also a straight chain alkane with unsaturated bonds.its molecular formulae is C4H10.Can be used as a refrigerant.looking at the structure give each point represents a carbon atom, placing a C on each point gives you a total of 4, making it to be butane.See picture attached for a vivid illustration of butane.
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Answer:
Butane
Explanation:
i just took tha test
What element was oxidized and reduced in this reaction and what is the oxidizing and the reducing agent for this reaction? Au(NO3)3 + Cu ——> Cu(NO3)2 + Au
Answer: Cu is oxidized while Au is reduced. The oxidizing agent is Au while the reducing agent is Cu
Answer:
Both blanks are "Ag"
(:
Explanation:
The basic unit of electric current is the:
ohm.
ampere.
* conductivity.
volt.
Answer is ampere
Answer:
It's B
Explanation:
Edge2021
On a camping trip, Marta roasts a marshmallow in the campfire. The marshmallow grows, and then turns black.
Marta notices that the roasted marshmallow smells and tastes differently than the uncooked marshmallows. What
change has taken place, and how does Marta know?
A
a chemical change because the marshmallow changed in taste, color and smell
B
no change because the marshmallow is not a new substance
с
only a physical change because the marshmallow changed size
D
a chemical change because the marshmallow only changed in pH level
Answer:
the answers for the quiz are;
1: A. appearance, composition
2: C. they link up in different ways
3: A. Shape
4: B. false
5: C. a chunky solid formed from two liquids combining
6: B. honey dissolving in tea
7: C. a red candy dissolves and turns water pink
8: liquid water becoming steam
9: D. A substance has changed chemically
10: A. a chemical change because the marshmallow changed in taste, color and smell
Explanation:
On the roasting of marshmallows, a chemical change takes place which changed their taste, color, and smell. Therefore, option (A) is correct.
What is the chemical change?A chemical change is a type of change in which the molecular composition is altered and a new substance is formed is known as a chemical change.
The changes are irreversible and permanent in chemical change. The mass of the substance is altered by adding or removing it during a chemical change.
During a chemical change, there is an energy difference in the breaking of old bonds and the formation of new bonds.
When marshmallows are roasted, a chemical change takes place. The heat causes a chemical reaction producing water molecules, which evaporate and leave carbon behind.
The marshmallow swells as the moisture inside expands, which causes the marshmallow to swell. when the moisture expands, it forms tiny holes in the marshmallow, which offer the moisture to escape as steam.
Then, the carbon present in sugar burns with the oxygen in the air. The blackened part of the marshmallow is the roasted carbon which changes the marshmallow's color.
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valence Bond theory predicts that tin will use which hybrid orbitals in Snf5 -1. sp3d sp3d2 sp3 or sp2
Answer:
sp3d
Explanation:
The ground state electronic configuration of tin is; [Kr] 5s²4d¹⁰5p². Hybridization is a valence bond concept that postulates that orbitals of appropriate energy could be mixed in order to produce suitable orbitals that could be used for bonding.
In the formation of Snf5^ -1, there is a hybridization of the 5p, 5d and 6s orbitals to yield the sp3d orbitals required for the formation of the chemical specie hence the answer.
Why do animals and plants have different habitats?
Answer:
Why do animals and plants have different habitats?
This is because the planet has different climates and different environments in every continents, organisms have evolved and adapted to these factors, that is why they have different habitats as well.
It is safe to say that organisms and their environment really are interrelated and needs each other in order to survive and continue.
#CarryOnLearning
Calcium carbonate is what kind of compound?
Answer:
Chemical Compound
Explanation:
I'm not sure why but I know it's chemical. Hope this helps!
1.___The enthalpy of the reactants of the reaction is about:
2.___The enthalpy of the products of the reaction is about:
3.___The activation energy of the reaction is about:
4.___The heat of reaction (ΔH) of the reaction is about:
5.___The forward reaction is:
6.___Addition of a catalyst would lower the:
7.___The enthalpy of the reactants is _______than the enthalpy of the products
a. greater
b. kinetic energy
c. 200 kJ
d. 120 kJ
e. exothermic
f. endothermic.
g. 80 kJ
h. 160 kJ
I. enthalpy
j. activation energy
k. less
Answer:
1.c 2.j 3.h 4.a 5.d 6. b 7.k 8.e
Explanation:
Calculate the molarity of the following solution: 0.50 moles of MgCl2 in 150 milliliters of solution.
Answer:
3.333M
Explanation:
Basically,
Molarity=(moles of solute)/(litres of solution)
=(0.5 moles)/(150/1000)L
=3.333M
What is true of a chemical reaction?a. Products and reactants must be balanced.
b. Subscripts must be used with all products and reactants
c. Energy must be included in the beginning of the reaction
d. Coefficients must be used with all products and reactants
Answer: The product and reactant must be balanced
Explanation:
1. In which substance does bromine have an oxidation number of +3?
Answer:
The bromine atom in bromine fluoride, or BrF, has an oxidation number of +1. In bromine dioxide, or BrO2, it has an oxidation number of +4. This is because fluorine usually has an oxidation number of -1, and oxygen usually has an oxidation number of -2.
Explanation:
I got this from online so...
How does the urinary system maintain homeostasis?
Answer:
here is ur ans Lilly
Explanation:
In addition to maintaining fluid homeostasis in the body, the urinary system controls red blood cell production by secreting the hormone erythropoietin. The urinary system also plays a role in maintaining normal blood pressure by secreting the enzyme renin.hope it's helpful for you mark brainlest where you from , age
Some plants can reproduce both sexually and asexually. Explain one benefit of this dual reproduction capability.
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Answer:
An additional advantage of asexual reproduction is that colonization of new habitats may be easier when an individual does not need to find a mate to reproduce. During sexual reproduction the genetic material of two individuals is combined to produce genetically diverse offspring that differ from their parents.
Explanation:
An organism has many benefits for having the ability to reproduce both sexually and asexually. The first of these benefits is that it doesn't have to find a mate in order to reproduce, so it can create offspring by itself, and enable the continuation of its' species.
If you need more help on this subject, don't be afraid to ask me. I'm willing to help.
If 33.0 grams of hydrogen gas react with 300. grams of oxygen gas, what is the percent yield if an experiment produces 250. grams of water? Use the balanced equation from question 3.
Answer:
can you show us question 3 pls
Explanation:
Which of the following operations usually makes a substance dissolve faster in a solvent?
A)agitation
B)raising the temperature
C)crushing the substance to a powder
D)all of the above
Answer:
B and C
Explanation:
powder dissolve faster than particles
the higher the temperature the faster the dissolving process
Use the following information to answer the next question
The oil that Syncrude mines from the Athabasca Tar Sands contains large amounts
of undesirable sulfur. To remove most of the sulfur, Syncrude uses a chemical
process known as the Claus process, which results in a low-sulfur "sweet crude oil.
Two steps involved in Claus process are shown below.
Step! H2S(g) + 02(9) - S02(g) + H2O(g) AH = - 518 kJ
Step || SO2(g) + 2 H2S(g) - 3 S(I) + 2 H2O(g) AH = -93 kJ
Syncrude solidifies and stores approximately 1.36 Gg of sulfur per day.
and the enthalpy for the
11. The net equation for the Claus process is
net reaction is -
kJ.
The statement above is best completed by the answers in row:
Row
i
ii
2 H2S(g) + O2(g) - 2 S(0) + 2 H2O(g)
611 kJ
3 H2S(g) + O2(9) – 3 S(0) + 3 H2O(9)
611 kJ
2 H2S(9) + O2(g) - 2 S(I) + 2 H2O(9)
425 kJ
3 H2S(g) + 302(9) - 3 S() + 3 H20(9)
425 kJ
Answer:
Tho oil that Syncrude mines from the Athabasca Tar Sands contains large amounts of undesirable sulfur. To remove most of the sulfur, Syncrude uses a chemcial process known as the Claus process, which results in a low-sulfur “sweet” crude oil.
Explanation:i found this online hope it helps