How can we separate a homogenous mixture (a solution)? For example, how can we separate salt that has been dissolved in water?
Answer:
Well, to separate salt from water, you would stir the two together to create a homogenous mixture. Then you would boil the mixture; all the water would evaporate, leaving behind the salt
Explanation:
Balance the following Equation:
___Zn + ___HCl --> ___ZnCl2 + ___H2
50g of zinc are reacted with 50g of hydrogen chloride. What is the limiting reactant?
Group of answer choices
HCl
ZnCl2
Zn
H2
Answer:
HCl
Explanation:
Given data:
Mass of Zn = 50 g
Mass of HCl = 50 g
Limiting reactant = ?
Solution:
Chemical equation:
Zn + 2HCl → ZnCl₂ + H₂
Number of moles of Zn:
Number of moles = mass / molar mass
Number of moles = 50 g/ 65.38 g/mol
Number of moles = 0.76 mol
Number of moles of HCl:
Number of moles = mass / molar mass
Number of moles = 50 g/ 36.5 g/mol
Number of moles = 1.4 mol
Now we will compare the moles of Reactant with product.
Zn : ZnCl₂
1 : 1
0.76 : 0.76
Zn : H₂
1 : 1
0.76 : 0.76
HCl : ZnCl₂
2 : 1
1.4 : 1/2×1.4 = 0.7
HCl : H₂
2 : 1
1.4 : 1/2×1.4 = 0.7
Less number of moles of product are formed by HCl it will act limiting reactant.
Which list of features describes an economy based on free enterprise?
government control of trade, laws that favor business, labor guilds
government ownership of factories, law that favor workers, limited trade with other countries
no government intervention, law of supply and demand, open trade with other countries
some government intervention, minimum wage laws, price setting
Answer:
no government intervention, law of supply and demand, open trade with other countries
Explanation:
A free enterprise system is an economy that is free from any type of government intervention.
Also, I took the quiz :)
why was the turtle shy at the party?
Answer:
Because he likes someone named shelly?
The sum of 4.824 + 2.03 + 4.72319 + 123.4567 + 111.1 expressed to the
proper number of significant figures is
Answer:
246.13389
Explanation:
Simplify the expression.
Which of the following chemical reactions is balanced?
Answer:
a
Explanation:
A covalent compound contains 2 atoms of nitrogen and 4 atoms of oxygen. What is the percent by mass
composition of nitrogen?
(I’ll mark you as brainlister)
The percent by mass composition of nitrogen:
Given information :Nitrogen- 2 atomsOxygen-4 atomsMass of oxygen-16Mass of nitrogen -14Solution :
Total mass = Nitrogen + Oxygen
Total mass= 2*14+4*16Total mass= 92Percent mass composition of nitrogen =mass of nitrogen*2/ total mass*100
Percent mass composition of nitrogen=28/92*100Percent mass composition of nitrogen=30*.4The percent by mass composition of nitrogen is 30.4.
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https://brainly.com/question/4412816?referrer=searchResults
Complete the Lewis structures for diazine (C5H4N2) showing the two most common resonance forms. Draw the Lewis structures with the formal charges minimized.
Answer:
See explanation and image attached
Explanation:
Lewis structures dot structures that show the number of valence electron in a molecule. Sometimes, we show bonded electrons using a single line as in the image attached.
Two images are shown. They are the both resonance structures of diazene. The both structures only differ in the arrangement of electrons as we can see from the image.
What is a compound supstence?
Answer:
A compound supstence is any chemcail compond
Explanation:
brainliest
Why is the handle of a pot plastic and not metal?
Group of answer choices
Plastic is a conductor
Plastic is an insulator
Plastic is thicker than metal
There is no reason
Answer:
Plastic is an insulator
Explanation:
This enables you to touch it without burning yourself because it does not conduct heat easily.
Acid and bases virtual lab
Answer: Lab - refer to attached -
All correct, completed vital lab for Acid and bases
Explanation: Mark me as Brainliest ;)
which of the following uses mechanical energy to function?
A. computer
B. battery
C. microwave oven
D. windmill
Isotopes of the same element vary from each other in their number of:
neutrons
electrons
protons
Answer:
Neutrons
Explanation:
How much Ag can be produced if one is given 64 g of Ag2O?
mass Ag = 59.5 g
Further explanationGiven
64 g of Ag2O
Required
Mass of Ag
Solution
Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
mass of Ag in Ag2O :
= ((2 x Ar Ag)/molar mass Ag2O )x mass Ag2O
[tex]\tt mass~Ag=\dfrac{2.Ar~Ag}{MW~Ag_2O}\times mass~Ag_2O[/tex]
Ar Ag : 107,8682 g/mol
MW Ag₂O = 231,735 g/mol
Input the value :
mass Ag = ( (2 x 107,8682 g/mol )/ 231.735) x 64 g
mass Ag = 59.5 g
Or we can use reaction
2Ag₂O ⇒ 4Ag + O₂
mol Ag₂O :
= 64 : 231.735
= 0.276
mol Ag :
= 4/2 x moles Ag₂O
= 4/2 x 0.276
= 0.552
mass Ag :
= 0.552 x 107,8682 g/mol
= 59.54 g
PLEASE HELP ASAP WILL GIVE Brainlist
Answer:
3 5 5 3
Explanation:
Not 100% sure on this question
The sample is made up of neutral atoms. Using the information in the diagram shown, determine the number of protons, neutrons, and electrons found in each atom of your sample
Explanation:
Atoms are generally made up of three fundamental particles which are the protons, neutrons and electrons.
Protons are the positively charged particles within an atom.
Electrons carry negative charges.
Neutrons do not carry any charges.
When an atom is neutral, the number of protons and electrons within the atom is the same.
A charged atom will have a difference in the number of protons and electrons they contain.
Headphones take in sound waves. This is an example of ...
A)reflection
B)absorption
C)transmission
D)refraction
The amount of matter in a given amount of volume is referred to as
A. Weight
B. Mass
C. Density
D. Volume^2
Answer:
It would be Density because:
Density= mass/ volume
Density refers to the amount of matter or mass of a substance over a volume
Answer answer answer answer answer answer answer
Answer:
if she did it immediately and then weighed it all it would b
Explanation:
Answer:
The answer is B
I saw this question in class today
Explanation:
Which of these is an example of genetic variation?
A. Two lizards are fighting and one loses its tail.
B. Bacteria reproduce asexually and produce two clones.
C. Two sisters are born with brown hair and one dyes their hair blonde.
D. In butterflies, some are born with more dark colored spots than others.
Answer:
D. in butterflies, some are born with more dark colored spots than others.
Explanation:
hope this helps my friend
help pleaseeeeeeee eee
bee (b)
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what kind of oxide is formed when a piece of sodium is dropped in the water
Answer:
Sodium oxide is the product
Explanation:
4Na+O2->2Na2O
6. A 3 liter solution contains 140 g of Sodium Bromide (NaBr). What is the molarity of the solution?
Please help I am being timed
The molarity = 0.454 M
Further solutionGiven
Volume = 3 L of solution
mass = 140 g of NaBr
Required
The molarity
Solution
Molarity is a way to express the concentration of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
mol of NaBr :
= mass : MW
= 140 g : 102,894 g/mol
= 1.361
Molarity :
= 1.361 mol : 3 L
= 0.454 M
Which salt(s) has an exothermic enthalpy of solution? Check all that apply.
Answer: it’s the bottom 2
Explanation: I just took the test and was able to see the answer. :)
Answer:
Chemistry makes no sense. See below for answer.
Explanation:
What are three possible ways a new gene inserted into cells using gene therapy could improve a person's health?
Answer:
1: Killing a specific gene.
2: augmentation of a gene.
3: Inserting a new dominant gene.
Explanation:
ughh please help me
Answer:
Substance 2
Explanation:
The stronger the intermolecular forces are, the more energy is required, so the higher the melting point is.
Answer:
Substance 2
Explanation:
I know this because substances with a stronger molecular attraction are less susceptible to melting quicker than substances who have a weaker attraction with each particle. Therefore, substance 2, which melted after substance 1, has a stronger molecular attraction then substance 1.
(copy and paste above if you want)
based on the balanced equation: 2 K + Cl2 --> 2KCl what is the mole ratio of K to KCl
Answer:
2 : 2
Explanation:
The balanced chemical equation is given as:
2K + Cl₂ → 2KCl
From the balanced reaction equation, we can conclude that;
2 moles of K will react with 1 mole of Cl₂ 2 moles of K will produce 2 moles of KCl 1 mole of Cl₂ will produce 2 moles of KClTherefore, the mole ratio is 2:2 or 1:1 in the simplest form.
Place the following events in sequence:
A) Your eardrum begins vibrating
B) Electrical impulses travel along nerve fibers
C) The hammer, anvil, and stirrup begin moving
Answer:
A, C, B
Explanation:
HELP PLEASEEEEEEEE HELPPPPPPP (IMAGE)
Question 1 options:
solid
liquid
gas
Question 2 options:
solid
liquid
gas
Question 3 options:
solid
liquid
gas
Which of the following is a strong acid?
Answer:
C. HCl
Explanation:
HCl is a strong acid because it dissociates almost completely.