Answer:
id say mass
Explanation:
but i d k
Why do chemical changes happen
Answer:
Reactions occur when two or more molecules interact and the molecules change. ... Bonds between atoms are broken and created to form new molecules. That's it.
Explanation:
Please help me out with this assignment
Answer:
1. 7 meters
2. gullet
4. Not sure about this
6. strong
7. digestive
8. starch
12. Not sure about this either
14. Water
15. Jejunum
19. teeth
Hope this helps!
WHAT IS THE TOTAL NUMBER OF ATOMS IN BOTH OF THESE
COMPOUNDS?
I will give you a lot of points help me ASAP please I am begging you
Answer:
hope this helps
Explanation:
If the theoretical yield of a reaction was calculated to be 42.6 grams and when the
experiment was conducted the amount produced was 20.7 grams, the what is the percent
yield of the experiment?
Answer:
48.59%
Explanation:
theoretical yield = 42.6g
actual yield = 20.7g
% yield = 20.7/42.6 x 100 = 48.59% (2 d.p.)
In a salt synthesis experiment, 13.1 g of sodium reacts with 94 g of chlorine gas, yielding 22.5 g of sodium chloride. 2Na(s) + Cl2(g) →2NaCl(s) What is the percent yield for this experiment?
Answer:
67.58%
Explanation:
First we convert the masses of the reactants into moles, using their respective molar masses:
Na ⇒ 13.1 g ÷ 23 g/mol = 0.570 molCl₂ ⇒ 94 g ÷ 70.9 g/mol = 1.32 molBy looking at the reaction equation, we know that 1.32 moles of Cl₂ would react completely with (2 * 1.32) 2.64 moles of Na. There are not as many Na moles, so Na is the limiting reactant.
Now we calculate how many NaCl moles would have been produced if all the limiting reactant was consumed:
0.570 mol Na * [tex]\frac{2molNaCl}{2molNa}[/tex]= 0.570 mol NaClWe convert those moles to grams:
0.570 mol * 58.44 g/mol = 33.31 g NaClFinally we calculate the percent yield:
22.5 g / 33.3 g * 100% = 67.58%The cell in the diagram to the right is going through a process that indicates it is a?
A-nerve cell
B-brain cell
C-blood cell
D-sex cell
NEED NOW!!
In negative adsorption the concentration of the solution is
Answer:
This is called negative adsorption. Hence if the concentration of the adsorbate is less on the surface of the adsorbent than in the bulk, it is known as negative adsorption.
Explanation:
Hope this helps
What tuberculosis means "
Answer:
it is a infectiousr bacterial disease characterized by the growth of nodules(tubercles) in tissues especially the lungs
The _energy of the baseball is the sum of the kinetic energy and _energy of the particles that make up the baseball
Answer:
Mechanical energy
Kinetic energy
Explanation:
The mechanical energy is the sum of the kinetic and potential energy of the particles that make up the baseball.
Mechanical energy is made up of kinetic energy and potential energy. When the baseball is in motion, the particles make use of the kinetic energy, also known as motion energy and when the ball is not in motion the particles make use of the potential energy, also known as stored energy.
. In a full paragraph, tell what would you do to remove the kudzu from your property forever and what steps you will take to ensure your land and the native species on it are not being harmed. pls answer now
Efforts to control kudzu infestations have included the following methods: cutting, grazing, digging, disking, prescribed burning and application of herbicides. Roots of mature plants grow too deeply to be affected by freezing. Burning will kill only the very young plants.
Ideally, simply pulling out the heavy vines would prevent the kudzu from returning. However, you still need to kill each of the rooted stems at their crowns. Mowing or cutting back the vegetation to the ground provides the first step in removal. Then it’s time to bring out the big guns in the form of chemical herbicides.
_NaHCO(s) --> _CO2+_NaCO(s)+_H2O
balance the equation
The balanced equation :
2NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
Further explanationGiven
Reaction
NaHCO(s) --> _CO2+_NaCO(s)+_H2O
Required
The balanced equation
Solution
Maybe the equation should be like this :
NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
Give a coefficient
NaHCO₃⇒aCO₂ + bNa₂CO₃+cH₂O
Make an equation
Na, left=1, right=2b⇒2b=1⇒b=1/2
H, left=1, right=2c⇒2c=1⇒c=1/2
C, left=1, right=a+b⇒a+b=1⇒a+1/2=1⇒a=1/2
The equation becomes :
NaHCO₃⇒1/2CO₂ +1/2Na₂CO₃+1/2H₂O x2
2NaHCO₃⇒CO₂ + Na₂CO₃+H₂O
If the mass of an object is 15kg and the volume of an object is 15ml, what is its density?
0 225kg/ml
Okg/ml
1kg/ml
30kg/ml
Answer:
1kg/ml
Explanation:
What is the movement of water across a membrane from an area of high concentration to an area of low concentration 
Answer:
Osmosis
Explanation:
The movement of water across a membrane from an area of high concentration to that of low concentration is defined as osmosis.
Osmosis is very important in all living cells because it is one of key mechanism for transporting materials between and within cells.
The membrane most times is selectively permeable in nature and it allows for a regulated movement of materials from one region to another.
Explain the effect of pressure on the following chemical equation :
[tex]CaCO_3 = CaO + CO_2[/tex]
2. Explain the effect of concentration in the following equation :
[tex]3Fe \: +4H_2O= Fe_3 \: O_4 + 4H_2[/tex]
Answer:
Explanation:
One
Pressure will favor the side with the least number of mols if it the larger number of moles counts only the gases. (Le Chetalier's Principle). In this case both CaCO3 and CaO are not soluble in water. The only gas is CO2. Since it represents the most number of mols the reactant is favored.
More or Less are very troublesome words in beginning science. Make sure you understand their meaning for this question. The more pressure applied, the more the reactants will be favored and the equation shifts left.
Two
Fe and Fe3O4 are both solids. It depends on the form that water takes. Looking it up, it is shown to be in a gas form. That means if you increase the pressure, nothing will happen. That is not your question, but you should note it.
The answer to your question is you increase the concentration of Fe or H2O, the equilibrium will shift right.
If you add more Fe3O4 or hydrogen it will shift left.
Chemists say that if you alter the equilibrium the equation will shift in the opposite direction to compensate for the action you have taken.
please help me i really am struggling
Answer:
It is visible light
Explanation:
For 30 points pls help me with this question
Answer:
a put a as you answer you rock do not give up on your dreams
The pictures below show samples of different substances.
The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?
A. No, because they have different masses.
B. No, because they have different volumes.
C. Yes, if each sample contains 6.02 x 10^23 atoms.
D. Yes, if each sample contains 2 amu.
Answer:
C. Yes, if each sample contains 6.02 x 10²³ atoms.
Explanation:
It is possible for each sample to contain 1 mole of each sample if and only if each of the sample if made up of 6.02 x 10²³ atoms.
6.02 x 10²³ atoms is the Avogadro's number. This number is equivalent to a mole of a substance.
If the amount of matter in the given substance is at least one mole, it is possible that they are made up of one mole each of each substance. If they contain lesser amount of atoms, then it is not up to one mole of substance. But if it is greater, then, we can have even more than one mole of substance.A mole is simply a unit of measurement and it is equivalent to 6.02 x 10²³ atoms.
Answer:
C
Explanation:
i just took the test
:)
Identify the properties of a covalent substance (multiple answers )
A) high melting point
B) low melting point
C) soluble in water
D) soluble in alcohol
E) conducts electricity in water
does not conduct electricity in water
A) high melting point
C) soluble in water
D) soluble in alcohol
E) does not conduct electricity in water
these options are a bit vague as some covalent substances dissolve in water / alcohol while some don't
Explain why in this crossing all of the hedgehog offspring are brown even though they all carry the white gene?
Drag the tiles to the correct boxes to complete the pairs.
Match the sequences with the mutations that occurred in them.
deletion translation inversion duplication
translocation
inversion
duplication
Answer:
Yall are coming after that person above me when theres no diagram!!!! HELLO????????????? crazy
Explanation:
To have a system you need more than one magnet .
true or false
Answer:
True
Explanation:
Answer: true
Explanation:
A student views four models showing magnified views of the phases of matter.
What question will best help the student determine which model is plasma?
A
Which model is composed of rapidly moving particles?
B.
Which model is composed of particles vibrating in place?
C
Which model is composed of electrically charged particles?
Which model is composed of particles sliding past each other?
Answer:
C Which model is composed of electrically charged particles?
Explanation:
The best question to resolve and determine the model which is plasma is to find one that is composed of electrically charged particles.
Plasma is one of the states of matter which is characterized by ions and other charged particles.
Matter is anything that has weight and occupies space.
There are four known states of matter which are:
Solid Liquid GasPlasmaPlasma is the only state of matter made up of charged particles.
2. Which WHMIS symbol would require gloves? A ventilator? A gas mask?
Answer:
Ventilator
Explanation:
What is the WHMIS 1988 classification? ... Symbol for Class D1 ... Direct contact with the liquefied gas can chill or freeze the skin (frostbite). ... Take precautions to ensure your own safety before attempting rescue (e.g. wear ... Increase ventilation to area or move leaking container to a well-ventilated and secure area.
So B. is the Right Choice!
ASAP HELP WILL MARK BRAINLIEST FOR BEST ANSWER. MUST ANSWER WITHIN 6 MIN!!!
Answer:
3 molecules
Explanation: i got it right on the test, also because the 2 other ones are compounds because they have hyrdogen and oxygen attached and molecules just have particles of one element attached
Answer:
3 molecules
Explanation:
what is the mass of 3.77mol of K3N?
495 g K₃N
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
3.77 mol K₃N
Step 2: Identify Conversions
Molar Mass of K - 39.10 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of K₃N - 3(39.10) + 14.01 = 131.31 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 3.77 \ mol \ K_3N(\frac{131.31 \ g \ K_3N}{1 \ mol \ K_3N})[/tex]Multiply/Divide: [tex]\displaystyle 495.039 \ g \ K_3N[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
495.039 g K₃N ≈ 495 g K₃N
i have 9 protons, 10 neutrons, and 5 electrons. what is the charge of my nucleus?
Answer:
+4
Explanation:
how can I identify a salt compound is acidic,basic,neutral
Salts that are from strong bases and strong acids do not hydrolyze. Salts that are from strong bases and weak acids do hydrolyze, which gives it a pH greater than 7. Salts of weak bases and strong acids do hydrolyze, which gives it a pH less than 7.
what is the theoretical yield (in mols) of magnesium when 1.1 x 102 mols of lithium reacts with excess magnesium chloride.
Explanation:
Use the molecular formula to find the molar mass; to obtain the number of moles, divide the mass of compound by the molar mass of the compound expressed in grams.
The process by which water, ice, wind and gravity remove and transport sediment from one place to another
A. Chemical weathering
B. Deposition
C. Physical weathering
D. Erosion
Answer:
either deposition or physical weathering
Answer:
D. Erosion
Explanation: