Answer:
a
Explanation:
Convert 50 m to mm
using the method of dimensional analysis
Answer:
Explanation:
meters has to go on the bottom of the bracket used for conversion
50m [ 1000 mm / 1 m]= 50000 mm The meters cancel
How much water will the measuring cup have if you poured 1/2 of it out?
One the first chemistry test. 12 students got As, 18 students got Bs, and 20 students got Cs.
a. What is the percentage of students received Bs.
b. What is the percentage of students who received Cs?
Express your answer to the ones place.
Answer:
A. 36 percent recieved Bs
B. 40 percent of students received Cs
Explanation:
Amount of students: 12+18+20=50
Students with Bs: (18÷50) x 100 = 36%
Students with C's: (20÷50) x100 = 40%
On the first chemistry test 12 students got A, 18 students got B, and 20 student got C. Thus the percentage of students received B is 0.36 and percentage of students received c is 0.40
What is the percentage of students received B and C?In mathematics, a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign %. A percentage is a dimension less unit and it has no unit.
In above question 12 student got A, 18 student got B, and 20 student got C.
So total number of student = 12 + 18 + 20 = 50.
Then the percentage of students received B is as follows:-
Percentage of students who got B = (student who got B/Total number of student) X 100.
=(18/50) X 100
= 36%
Now percentage of students who got C = (No of students who got C/Total students)X100
=(20/50) X 100
=40%.
Therefore,On the first chemistry test 12 students got A, 18 students got B, and 20 student got C. Thus the percentage of students received B is 0.36 and percentage of students received c is 0.40 percentage of students who got B is 36% and percentage of students who got C is 40%
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Hydrogen and oxygen combine in
the ratio of 1:8 by mass to form
water. What mass of oxygen gas
would be required to react
completely with 3 g of hydrogen
gas?
Answer:
hhshshhxujejushwhbwhsjs s hs
Which phrase correctly describes the molecular structure within a molecule?(1 point)
A the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds
B long, repeating chains of molecules
C the smallest fundamental unit of a compound that participates in reactions, represented by a bonded group of atoms
D the basic unit of a chemical element
Answer: A the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds
Explanation: I just took the assessment and in my notebook molecular structure has a definition that is literally answer A. Also I got it right lol.
Randys first race is a potato sack race that is 410 meters long how many kilometers is the potato sack race
Doing my summer school work right now. Please help me pass I don’t want to take chemistry for the third time.
Một hỗn hợp X gồm CH3OH; C2H5OH; phenol có khối lượng 28,9 gam phản ứng vừa hết với 100ml dung dịch NaOH 2M. Phần trăm theo khối lượng phenol là ? Biết C = 12; O = 16; H = 1; Na = 23. *
Answer:
nNaOH = 0,2 mol
Trong hỗn hợp các chất đề bài cho chỉ có phenol tác dụng với NaOH
C6H5OH + NaOH → C6H5ONa + H2O
0,2 ← 0,2 (mol)
⟹ mphenol = 0,2.94 = 18,8 gam
⟹
%mC6H5OH=18,8/28,9 x100%= 65,05%
Explanation:
What is the boiling point (in °C) of a 0.743 m aqueous solution of KCI?
Enter your rounded answer with
3 decimal places.
difference between Nitrogen 1 oxide and Oxygen
Answer:
one atom of oxygen is not equal to oxygen
Describe how methane is
formed in terms of chemical bonding
Please help me find what type of chemical reaction takes place from numbers 1-5.
write its IUPAC name?
Answer:
Hello
please make sure that there is any group which is join with alkane
what do you mean by Arsenic Pollution?
Arsenic contamination of groundwater is a form of groundwater pollution which is often due to naturally occurring high concentrations of arsenic in deeper levels of groundwater.Arsenic contamination of ground water is found in many countries throughout the world, including the US.
7. In a remote area of Columbia, kids have to travel to school on a zip-line!
Would school attendance increase if all kids has to get to school on a fun
zip line?
Make a hyphotesis
Help plz!!!
Answer:
yes
Explanation:
Kids like fun things, and school is not fun , so if kids got to go to school on a zipline, attendance would be through the roof!
What is an alkyne?
A. A hydrocarbon containing all single bonds
B. A hydrocarbon containing a carbon-carbon double bond
C. A hydrocarbon containing a carbon-carbon triple bond
D. A hydrocarbon containing an aromatic ring
Alkynes are called the hydrocarbons. Ethyne is an important alkyne which is used in oxyacetylene gas cutting. A hydrocarbon containing a carbon-carbon triple bond is the alkyne. The correct option is C.
What is an alkyne?In organic chemistry, an alkyne is defined as the unsaturated hydrocarbon containing at least one carbon-carbon triple bond. The alkynes are unsaturated hydrocarbons and their general formula is CₙH₂ₙ₋₂ and the triple bond is known as the acetylene bond.
Many alkynes are found in nature. Ethyne is the first member of the alkyne family in which two carbon atoms are connected by a triple bond. Almost all alkynes are also found to be hydrophobic in nature.
Alkynes show three types of isomerism like chain isomerism, position isomerism and functional isomerism. The triple bond present in the alkynes is its functional group.
Thus the correct option is C.
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3.
Melting point of four solids A, B, C and D are 299 K, 111K, 150K, 340K.their inter
particle forces of attraction are in the order:
(a) A
(b) B
(c) C
(d) B
Answer:
You have provided wrong option.
Their interparticle forces of attraction are in the order D>A>C>B
So, option (d) D should be there.
yall what do ya think shaped ya feelings bout science classes?
I was interested in science when I first saw a diagram of Solar system in my sister's geography book. At that time I was in Senior Kindergarten and she was in 6th grade. At first, I was just interested in space, universe and black holes stuff, but then as I started learning more, I realised how amazing other branches of science are too. They are so systematic. What encourages me to learn more are the gaps in science, its mysteries, I wish to uncover them one day, and for that I am preparing myself. When I am in a science class, I try to imagine where can I apply this knowledge in my day to day life, and my teachers are fascinated when I ask them if this principle is responsible for this phenomena. I love it very much. I like Physics the most, but other branches are great too.
The liquid is being heated.
Marion measured the volume of the liquid at the start and the end of the Marion experiment.
Do you think there was less, more or the same volume of liquid at the end as there was at the beginning?
Give a reason for your answer.
there should be less liquid at the end of the experiment since heating liquid is an endothermic process, and endothermic processes typically break the bonds between liquids. The applied heat would soon break the bonds that hold the molecules of the liquid together, and evaporation would occur once the temperature is hot enough. Thus, the evaporated water would decrease the volume of the liquid.
2(3a-3)-2(a-2)=3
thank you
Answer:
6a - 6 - 2a + 4 = 3
4a - 2 = 3
4a = 3 + 2
4a = 5
a = 5/4
hope that helps ✌
which type of model best represents simple molecules?
> ribbon
> wire
> Lewis dot
> structural formula
Answer:
Lewis dot
Explanation:
It's a very simplified representation of the valence shell electrons in a molecule.
The correct answer is Lewis dot.
A Lewis dot structure of a molecule is a structure in which the valence electrons of the molecule are represented using dots.
It is usual to seek a simple representation for simple molecules that explains in part, the properties of the molecule.
Such a representation must show the valence electrons in the molecule. A simple representation that can do this is the Lewis dot structure of molecules. The Lewis dot structure of NO2 molecule is shown in the image attached to this answer.
It was introduced by G.N Lewis and can be successfully used to represent many simple chemical molecules.
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Josefina and Raul were comparing how sound moves through various mediums and how charge moves through conducting wires. They performed experiments to find out if the factors that determine the speed of sound are the same as those that determine the flow in a circuit. What did they find? Describe two things that they found. For each, explain how the speed of sound and flow of current are affected
They found that difference occurs in the speed of both sound and charges occur due to the difference in the type of medium.
Sound and charges needs specific medium for faster movement i.e. sound moves faster in solid as compared to liquid and gas whereas charges moves faster and easily in gold due to lower resistance which is followed by copper. Sound can move from solid, liquid and gases whereas charges move only in solid metal in which free electrons are present. The speed of sound and flow of current are affected due to difference in the arrangement of atoms in solid, liquid and gas.
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one similarity between physics and chemistry is...
Answer:
They are branch of science.
Explanation:
hope this helps
Answer:
Branch's of science yk
Explanation:
I'm smart lol
Which of the following is an example of a chemical change?
A. Sugar breaking down into water and carbon when it is heated
B. A sugar cube being crushed by a spoon
C. Sugar mixing with red food coloring and forming a red solid
D. A sugar cube dissolving in water as the water is stirred
Answer:
I think its sugar breaking down into watee and carbon when it is heated
I HOPE ITS RIGHT IF NOT THEN SORRYHAVE A GREAT DAY :)
solubility of sodium chloride in water at 27 degree celsius is 22.7 in hundred ml of water the density of water is 1.0 gram per ml calculate the concentration of sodium chloride in term of mass percentage when dissolved in 500 ml of water
please tell me correct answer with solution
Answer:
of what grade it is of??
Explanation:
tell me then ill answer
WILL MARK BRAINLY IF GOOD ANSWER :)
Chlorine and oxygen are both gases at room temperature. What are some characteristic properties of chlorine that distinguish it from oxygen?
Answer:
Well one characteristic is electical energy transforms into thermal energy and gases and the state of matter(one of the distinct form i which matter exist)
The structure of a water molecule (H20) can be written as H-O-H, with each dash representing a chemical bond.
Count the number of bonds the oxygen and hydrogen atoms form in a water molecule.
Answer:
oxygen shows 2 bonds with hydrogen
Are all elements atoms and are all atoms elements?
Answer:
yes
Explanation:
because is smallest element that are made up of atom
Answer: Yes
Explanation:
How would one make a 2 M solution of a compound?
A. By dissolving 1 molar mass of the compound in 2 L of water
B. By dissolving 2 moles of the compound in 1 L of water
C. By dissolving 1 mole of the compound in 2 L of water
D. By dissolving 2 g of the compound in 1 L of water
To make a 2 M solution, the correct method is to dissolve 1 mole of the compound in 2 L of water. This results in a concentration of 2 moles per liter, which corresponds to a 2 M solution.
The correct option is C.
To make a 2 M (molar) solution of a compound, we need to dissolve an appropriate amount of the compound in a given volume of solvent, typically water, to achieve a concentration of 2 moles per liter.
Molarity (M) is defined as moles of solute per liter of solution. To prepare a 2 M solution, we need a concentration of 2 moles per liter. This means that for every liter of solution, we should have 2 moles of the compound.
Option A suggests dissolving 1 molar mass of the compound in 2 L of water. However, molar mass is not equal to moles. Molar mass represents the mass of one mole of the compound.
Option B suggests dissolving 2 moles of the compound in 1 L of water. This would result in a concentration of 2 moles per liter, which matches the desired 2 M concentration. However, the given option indicates dissolving 2 moles in 1 L, which contradicts the definition of molarity.
Option C suggests dissolving 1 mole of the compound in 2 L of water. This aligns with the definition of molarity, as it gives us a concentration of 1 mole per liter. To achieve the desired 2 M concentration, we would need to double the amount, resulting in 2 moles per liter.
Option D suggests dissolving 2 g of the compound in 1 L of water. This option does not consider the molar mass of the compound and assumes that the molar mass is equal to 2 grams per mole, which is not always the case.
In conclusion, option C is the correct choice for making a 2 M solution, as it involves dissolving 1 mole of the compound in 2 L of water.
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c. The element in group 2 and period 3 is -
Answer:
Magnesium
Explanation:
Hope this helps!
