Answer:
false
Explanation:
Of the molecules below, only ________ is polar.a. SiCl4 b. CH4 c. CCl4 d. SeF4
Answer:
SeF4 is a polar molecule
Explanation:
SeF4 is a polar molecule because a polar molecule is any molecule that have lone pairs of electrons in the central atom or have atoms that are electronegative and the electrons between that are covalently bonded are not evenly distributed.
The electronegative atoms of flourine in SeF4 are not evenly distributed and kind pairs of electrons are on the central atom.
Methane is a major component of natural gas, which is used as a fuel in homes.Write a balanced equation for the complete oxidation reaction that occurs when methane (CH4) burns in air.
Answer:
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)
Explanation:
Methane is an hydrocarbon. Whenever hydrocarbon undergoes a reactio with oxygen, the products formed are carbon(iv) oxide and water.
The equation of the reaction is given as;
CH4 + O2 --> CO2 + H2O
Upon balancing the equation, we have;
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)
22. What is the molar mass of oxygen (O2)?
A- 15.9994 g/mol
B- 1.204 x 1024 g/mol
C- 6.02 x 1023 g/mol
D- 31.9988 g/mol
Answer:
D- 31.9988 g/mol
Explanation:
The molar mass of a substance is the mass in grams of one mole of the substance. For a compound, the molar mass is the gram - formula mass or gram - molecular weight. It is determined by the addition of its component atomic masses;
To find molar mass of O₂;
Atomic mass of O = 15.9994g/mol
Molar mass of O₂ = 2(15.9994) = 31.9988g/mol
Which of the following are excited in ultraviolet photoelectron spectroscopy?
A. Core electrons
B. Nonvalence electrons
C. X-rays
D. Valence electrons
Answer:
D. Valance Electrons
Explanation:
If ur car goes 50 kilometers in 2 hours, what is its average speed?
Answer:
25 km per hour
Explanation:
50/2=25
how many hydrogens are in carbon tetrahydride?
Answer:
4
Explanation:
Carbon tetrahydride is better known as methane.
Methane is an alkane with a chemical formula CH₄. It is a gaseous organic compound.
Within the compound, there is a central carbon atom. Which is bonded covalently to 4 hydrogen. So, there are 4 hydrogens in a carbon tetrahydrideWhat substitution product will be formed from the SN2 reaction between trans-1-chloro-4-methylcyclohexane and sodium hydroxide?a. cis-4-methylcyclohexanol and sodium chloride b. trans-4-methylcyclohexanol, cis-4-methylcyclohexanol, and sodium chloride c. 4-methylcyclohexanol and sodium chloride d. trans-4-methylcyclohexanol and sodium chloride
Answer:
a. cis-4-methylcyclohexanol and sodium chloride
Explanation:
An SN2 reaction is a concerted mechanism of nucleophilic substitution of an alkyl halide in which there is inversion of configuration of the product.
This inversion of configuration occurs because the entering group attacks the substrate from the backside. In the transition state, both the leaving group and entering group are partially bonded to the substrate in the front and backsides respectively.
Hence, if we start with trans-1-chloro-4-methylcyclohexane, we end up with a product of inverted configuration which is cis-4-methylcyclohexanol and sodium chloride as a byproduct.
If you were travelling outward from the earth in a space shuttle at an altitude of 88.4 km you would be in the ----------
Answer:
air
Explanation:
you would be going through air
If you were travelling outward from the earth in a space shuttle at an altitude of 88.4 km you would be in the air.
What is altitude ?The height of a celestial object above the horizon, as opposed to its vertical elevation above the surface of a planet or natural satellite (such as the ocean or land).
Space grew taller, height is the perpendicular elevation of an object over its base, the ground, a specific level, or one object over another. For example, the altitude of a mountain or a bird above a tree's top are examples of height.
A triangle's altitude is determined by drawing a perpendicular line from its vertex to its opposite side. The altitude, sometimes referred to as the triangle's height, forms a right-angle triangle with the base.
Thus, when travelling outward from the earth in a space shuttle at an altitude of 88.4 km you would be in the air.
To learn more about altitude refer the link below;
https://brainly.com/question/4390102
#SPJ2
Question: How does mass and volume affect sinking and floating?
Please don't plagiarize
.....
What does the main difference between protons and neutrons
Answer:
The main difference is that neutrons are neutral while protons are positive.
Explanation:
Neutrons have nor charge and protons have a positive charge. Hope this helps!
Answer:
Protons: Determine the element
Neutrons: Is for the Average atomic mass or AMU for short.
Explanation:
can someone plz plz plz help me with my science question on my page!!!
Answer:
yesssssssssss
Explanation:
Which event always involves a chemical change?
Answer:
BurningExplanation:
A huge rock at the part gets really hot during the day because of what
7. A species is _ when its population has become so low that it is close to becoming extinct
a. Massive logging b. endangered c. pollutants d. population
pa help po,,,
Answer:
Endangered. The meaning of endangered is when a species declines in number- this might be because they are being eaten by another animal which has a higher popupayion, or perhaps because they are being hunted by humans for their meat or fur. Neither reason might be that their food or habitat has been destroyed b humans to create land for farming or housing. one example of name endangered species is Polar Bears: they like in the Antarctic where there is no land, simply ice. Due to humans causing climate change, the world is warming up and the ice is melting. This means polar bears are dying out because it would be too tiring to swim to find ice. For the same reason, other animals are dying in the Antarctic meaning that Poplar Bears have less to eat (being at the top of the food chain -no animal eats polar bears).
If the volume of an irregular sound is determined by the water displacement technique, its volume will be equal to
write your own definition of the word “particle” as it used in chemistry.
please do it now!! do not COPY from the internet.
Explanation:
Its a particle that can come from loads of things like mass for example, or gas, liquid or solid
Calculate the pH of the resulting solution if 32.0 mL of 0.320 M HCl(aq) is added to (a) 42.0 mL of 0.320 M NaOH(aq). (b) 22.0 mL of 0.420 M NaOH(aq).
Answer:
a) pH = 11.5
b) pH= 3
Explanation:
a) lets calculate the number of moles of each reactant
moles of HCl = 32/1000 * 0.32 = 0.01024 mole
moles of NaOH = 42/1000 * 0.32 = 0.01344 moles
1 moles of HCl reacts with 1 moles of NaOH , so 0.01024 mole of HCl should react with 0.01024 moles of NaOH , but there is some excess NaOH.
excess NaOH= 0.01344 -0.01024 = 0.0032 moles
[H+]= [tex]\frac{10^{-14} }{0.0032} = 3.125 *10^{-12}[/tex]
pH= -log [3.125*10^-12) = 11.5
b) moles of NaOH = 0.00924
excess HCl present = 0.01024 - 0.00924 =.001
so excess [H+] = 0.001
pH= -log( 0.001) = 3
the oldest rock on the bottom and newest on the top is called ____________
law of superposition
law of position
Law of gravity
Answer:
Law of position
Explanation:
Answer:
Law of Superposition
Explanation:
"A major principle of stratigraphy stating that within a sequence of layers of sedimentary rock, the oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence."
How many moles of CO are required to produce 45.0 L of carbon dioxide at STP?
2 CO(g) + O2(g) —> 2 CO2(g)
Answer should written as X.XX moles CO
Answer:
ang hirap na nag tanung
Question 11
What/mass of oxygen is needed to fill a 585 L tank at STP?
0.417 kg
0.835 kg
0.765 kg
Answer:
0.835 Kg
Explanation:
We'll begin by calculating the number of mole of oxygen that will fill 585 L tank at STP. This can be obtained as follow:
1 mole of oxygen (O2) occupies 22.4 L at STP.
Therefore, Xmol of oxygen will occupy 585 L tank at STP i.e
Xmol of oxygen = 585/22.4
Xmol of oxygen = 26.12 moles
Next, we shall determine the mass of 26.12 moles of oxygen. This can be obtained as follow:
Mole of O2 = 26.12 moles
Molar mass of O2 = 2 × 16 = 32 g/mol
Mass of O2 =?
Mole = mass /Molar mass
26.12 = mass of O2 /32
Cross multiply
Mass of O2 = 26.12 × 32
Mass of O2 = 835.84 g
Finally, we shall convert 835.84 g to Kg. This can be obtained as follow:
1000 g = 1 Kg
Therefore,
835.84 g = 835.84 g × 1 Kg / 1000 g
835.84 g = 0.835 Kg
Thus, 835.84 g is equivalent to 0.835 Kg.
Therefore, the mass of oxygen needed to fill the 585 L tank at STP is 0.835 Kg
If you want to form a kinetic enolate, you want to:______.A. use a strong, non-nucleophilic base such as LDA.B. use a protic solvent.C. use a low temperature.D. both use a strong, non-nucleophilic base such as LDA and use a low temperature.E. both use a strong, non-nucleophilic base such as LDA and use a protic solvent.F. both use a protic solvent and use a low temperature.
Answer:
D. both use a strong, non-nucleophilic base such as LDA and use a low temperature.
Explanation:
The more stable enolate is the thermodynamic enolate, and a less stable is known as the kinetic enolate.
The less stable enolate has a less substituted product, while the more stable product has a more substituted product.
Now, to form a kinetic enolate, we need to choose a strong, non-nucleophilic base such as LDA to attract hydrogen from the less substituted site. However, an increase in temperature results in an increase in a reaction, which leads to the formation of a stable product.
So, to form the kinetic enolate, a low temperature will be required.
Thus, To form a kinetic enolate, both use a strong, non-nucleophilic base such as LDA and use a low temperature.
1. Which statement is true about the Milky Way Galaxy?
O It is an irregular galaxy.
O It is a spiral galaxy.
It contains no more than 100 million stars.
New stars are not being created in it.
Answer:
Answer choice B. It is a spiral Galaxy
Consider the reaction of (R)-2-chloro-3-methylbutane with sodium iodide to form a
product.
1(a) Draw the reaction scheme with the correct stereochemistry (reactant + NaI → product
+ NaCl). Circle the nucleophile and draw a rectangle around the electrophile.
1(b) What is the symbol used for mechanism shown in 1(a)?
1(c) If the sodium iodide was replaced with sodium hydroxide, the product is an ALKENE. Draw a reaction MECHANISM to show how this happens.
1(d) Draw the reaction energy diagram for the reaction in 1(c) and label the activation
energy.
1(e) Using any alcohol with five carbons, and any carboxylic acid with six carbons, draw a
reaction to show how we would make an ester.
1(f) Describe the practical on esters.
Answer:
See explanation and image attached
Explanation:
Now let us consider the reaction closely, The reaction of (R)-2-chloro-3-methylbutane with sodium iodide is an SN2 reaction that occurs with inversion of stereochemistry.
When the OH^- is used, the reaction proceeds by E2 elimination giving the alkene product as shown in the image attached to this answer.
The reaction of a five-carbon alkanol and an acid to form an ester is also shown in the image attached to this answer.
To prepare an ester. the glassware must first be dried. The alkanol and alkanoic acid are added and refluxed in a magnetic stirrer and conc H2SO4 is added. A thermometer should be present in the set up. The refluxing should continue for about 60 minutes.
Jaxson needs to react 16.3 moles of copper (II) nitrate, Cu(NO3)2, in a chemical reaction. How many grams of crystals
does he need to weigh out?
Answer:
3056.25g
Explanation:
Problem here is to find the mass of Cu(NO₃)₂ to weigh out to make for the number of moles.
Given;
Number of moles = 16.3moles
Unknown:
Mass of Cu(NO₃)₂ = ?
Solution:
To find the mass of Cu(NO₃)₂, use the expression below;
Mass of Cu(NO₃)₂ = number of moles x molar mass
Let's find the molar mass;
Cu(NO₃)₂ = 63.5 + 2[14 + 3(16)]
= 63.5 + 2(62)
= 187.5g/mol
Mass of Cu(NO₃)₂ = 16.3 x 187.5 = 3056.25g
A teaspoon of dry coffee crystals dissolves when mixed in a cup of hot water. This process produces a coffee solution. Which term best identifies how the original crystals are classified?
-Reactant
-product
-solvent
-a solute
Answer:
The correct answer is - solute.
Explanation:
A solute is one half of a solution that is dissolved in the other half of the solution, known as the solvent. Solute particles are always less or lower in quantity or concentration than the solvent in a solution.
In this case, coffee crystals are dissolved in hot water so the solute will be coffee crystals and the amount of coffee crystals are also less than the amount of solvent.
Answer:
solute
Explanation:
what happens when you add acetic acid vinegar and sodium bicarbonate baking soda nahco
Explanation:
oh shi sorry I wish I could help but I'm stupid
View the illustration below and label each part.
A
Plzz help
Answer:
a is the peak/ crest
b is the through
c is the amplitude
d is the wavelength
A solution is made by adding 27 g of barium chloride into 74 g of water. What is the mass percentage of this barium chloride in this solution, to the units place?
Answer:
27 %
Explanation:
Step 1: Given data
Mass of barium chloride (solute): 27 gMass of water (solvent): 74 gStep 2: Calculate the mass of the solution
The mass of the solution is equal to the sum of the mass of the solute and the mass of the solvent.
m = 27 g + 74 g = 101 g
Step 3: Calculate the mass percentage of this barium chloride in this solution
We will use the following expression.
%m/m = mass of barium chloride / mass of solution × 100%
%m/m = 27 g / 101 g × 100%
%m/m = 27 %
2. Which property would help to determine whether matter is a solid or a liquid?
a. volume
b. color
C.shape
d.Mass
Answer:
A
Explanation:
Volume will help you determine whether is a solid or a liquid.
Have a great day
Do you Believe in soulmates why or why not
Answer:
I do because there are certain people that are right for you. If there was no such thing as soulmates, you could just get with anyone and it wouldnt matter. You dont just fall in love with anyone. You may mistake love for something else. But when you're in love you'll know. Twin flames are not the same. Some people mistake twin flames with soulmates. They are close but not so much in a way.
Explanation:
Answer:
Ye
Explanation:
