Answer:
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Does the excess reactant get used up completely in a reaction??
Answer:
In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.
Explanation:
Which of the following is NOT a good way to manage stress?
eat a healthful diet.
get enough sleep.
get plenty of exercise.
spend most of the time alone.
2. Which systems receive a benefit from the nervous system?
Digestive
Respiratory
Skeletal
Muscular
Cardiovascular (circulatory)
Answer:
spending most of the time aloneSkeletonExplain the method to decrease friction?
Answer:
having a smooth or lubricated surface may help decrease friction.
Explanation:
Help needed ASAP, I will mark your answer as brainliest.
Answer:
D
Explanation:
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Answer:
the answer is D
Explanation:
I hope this helped.
How do you balance this equation?
Answer:
Al4C3 + 12H2O = 3CH4 + 4Al(OH)3
Explanation:
Not sure if any explanation is needed but always start with the most complex compound. In this case it is Al(OH)3. You can see that there is 4 Aluminiums on the other side so I would start by putting a 4 next to the Al(OH)3. This now gives me 12 Hydrogens and 12 Oxygens on the right side. I put a 3 next to the CH4 to balance the Carbons on the left side. This leaves me with 12 Oxygens and 24 Hydrogens on the right side. This ends up being perfect because I can put a 12 next to the H2O.
How many moles of H2O are in 12.00 kg of water?
What is the mass of 2.15 liters of N2 gas at STP?
Explanation:
mole number =mass/molar mass
mass=mole number × molar mass
mass= (volume of gas/volume at stp)molar mass
mass=(2.15/22.4)28
mass=2.69g
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If a piece of pure gold jewelers weighs 11.81 grams, how many atoms is it made of?
Answer:30.573 Billion atoms are in one gram
Explanation:
Why does air density decrease with increasing altitude within Earth's atmosphere?
Explanation:
As the altitude increases, the pressure and the density of the atmosphere decrease.
If 3.25 g N2 gas is introduced into an evacuated 1.50 L flask at 325 K, what is the pressure
inside the flask (in atm)?
Answer:
2.06 atm
Explanation:
The computation of the pressure inside the flask is shown below;
As per the ideal gas law
we know that
P V = nRT
where
V = 1.50L
T = 325 K
R = 0.0821
Now moles of N_2 is
= 3.25 ÷ 28
= 0.116 mol
Now
P = NRT ÷ V
= 0.116 × 0.0821 × 325 ÷ 1.50
= 2.06 atm
Three different rocks that each weigh 50 grams are put out in the sunlight. After two hours, they are all at the same temperature. Pick the true statement.
Answer:
All rocks have same thermal conductivity.
Explanation:
Rocks are heated with the sunlight exposure. Different types of rocks have different thermal conductivity. The heat energy of the rocks is measure in Joules. The size and thermal conductivity of the rocks is important property which determines their heating capacity.
Silver nitrate is reacted with magnesium bromide and two products are formed.
(Ignore selected answer)
Answer:
The correct answer is :
a silver nitrate solution (AgNO3) is mixed with a solution of magnesium bromide (MgBr2). The balanced reaction would be: 2 AgNO3(aq) + MgBr2 --> 2 AgBr + Mg(NO3)2
the last one
How many non-bonding electrons are present in PO43- ? Group of answer choices
Read the given equation:
Ca(OH)2 + 2HCl - CaCl2 + 2H20
Which of the following is true about the equation? (5 points)
HCI is the base and Ca(OH)2 is the salt.
HCI is the acid and Ca(OH)2 is the salt.
Ca(OH)2 is the acid and Cacl2 is the salt.
Ca(OH)2 is the base and CaCl2 is the salt.
Answer:
D.
HCl is acid
Ca(OH)2 is base
CaCl2 is salt
In the given chemical equation Ca(OH)2 is the base and CaCl2 is the salt, thus option D is correct.
What is chemical equation?A chemical equation is a symbolic representation of a chemical reaction that shows the products, reactants, and direction of the reaction.
An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.
A base is a chemical species that donates electrons, accepts protons, or releases hydroxide (OH-) ions in aqueous solution.
A salt, in chemistry, is defined as the product formed from the neutralisation reaction of acids and bases.
Therefore, in this chemical equation option D is true about the equation i.e
Ca(OH)2 is the base and CaCl2 is the salt.
Learn more about chemical equation ,here:
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Depressants are often classified according to __________. Group of answer choices their MSA rating the degree to which they react with alcohol the degree they decrease CNS activity the first letter in their names
Answer:
the degree to which they decrease CNS activity
Explanation:
Drugs can be classified as;
✓hallucinogens, example is (LSD)
✓ stimulants, example is (cocaine)
✓opium-related painkillers example is (heroin)
✓depressants
Depressants can be regarded as medicines, that lowers neurotransmission levels, that is depressing or reducing arousal or stimulation as regards to various areas of the brain. these could be tranquilizers, as well as hypnotics and
sedatives. They are drugs used in slowing brain activity, therefore, making them useful when treating anxiety, sleep disorders, panic and acute stress reactions.
Example of Depressants are;
✓Xanax
✓Halcion
✓Klonopin
✓Librium
It should be noted that Depressants are often classified according to the degree to which they decrease central nervous system (CNS) activity.
what is diffrence bettwen thermal energy and heat
Answer:
Thermal, is mainly the heat trapped or in an object, such as a boiling water over a stove, its trapped and countinues to get hotter
Heat is basically the releasing of the energy that is contained in an object.
Thermal is the objects temperature, while heat is the Thermal energy that is released.
Explanation:
I need help with this ASAP PLEASE
439.3 g CO2
Explanation:
First find the # of moles of CO2 that results from the combustion of 3.327 mol C3H6:
3.227 mol C3H6 × (6 mol CO2/2 mol C3H6)
= 9.981 mol CO2
Use the molar mass of CO2 to determine the # of grams of CO2:
9.981 mol CO2 x (44.01 g CO2/1 mol CO2)
= 439.3 g CO2
Which structure shows the correct electron arrangement in CC14?
Answer:
second one
Explanation
Which of the following acids is in household vinegar? A nitric acid hydrochloric acid C fluoric acid D acetic acid
Answer: Out of the given options acetic acid is in household vinegar.
Explanation:
Household vinegar is the one that is commonly used in our home while cooking a number of dishes.
The common name of vinegar is acetic acid and its chemical formula is [tex]CH_{3}COOH[/tex].
For example, vinegar (acetic acid) is used while making noodles.
Thus, we can conclude that out of the given options acetic acid is in household vinegar.
The diagram above shows the repeating groups of atoms that make up two samples. Will the
properties of the two samples likely be the same or different? (Examples of properties are smell,
color, and the temperature at which a substance melts.)
a
The properties will likely be different because the repeating groups of atoms that make up
each sample are different.
b
The properties will likely be different because there are more repeating groups of atoms in
Sample 2.
c
The properties will likely be the same because the repeating groups of atoms that make up
the two samples have the same number of atoms.
d
The properties will likely be the same because the repeating groups of atoms that make up
the two samples have two of the same types of atoms.
1. How many times more acidic is Lemon Juice than apples?
What would a chemist most likely study about a car?
Answer:
I believe it's the chemical composition of the fuel and different fluids such as the coolant of the radiator
Explanation:
Chemists may discover more sustainable compounds that produce less waste material or that release more energy for the least amount of fuel. For coolants, fluids with greater heat retention that can absorb heat and direct it to the radiator in the most efficient manner. This is usually paired with engineering.
1.-Identifica y menciona los elementos que
componen los siguientes compuestos e identifica las características de las mismas, sigue el ejemplo que se encuentra en el recuadro:
• Dióxido de carbono
• Alcohol etílico o etanol
• Azúcar
• Urea
• Bicarbonato de sodio
Answer:
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Explanation:
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HELP ASAP PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
a. alkali
b. chemical
c. reactants
d. neutralised, acid
e. neutralisation
f. products
Explanation:
hope this helps and sorry if it is not right :)
Answer:
a). It is an ----Alkali.
b). ---a chemical reaction takes place.
c).----are the reactants in the reaction.
d).----the alkali has neutralized the acid.
e). --- is called a neutralization
f).---- of the products of the reaction is a salt.
How many grams of oxygen does it take to produce 9.60 moles of carbon dioxide?
307.2grams of oxygen does it take to produce 9.60 moles of carbon dioxide.
Answer:
Solution given:
1 mole of Oxygen=16g
Explanation:
C +O2=CO2
1 mole+ 1 mole =1 mole
12g. + 32g = 44g
we have
1 mole of carbon dioxide=12g of C and 32 g of O2
9.6 mole of carbon dioxide=12*9.6g of C and 32 *9.6g of O2
grams of oxygen needed is 32*9.6=307.2g
An isotope undergoes radioactive decay. The new isotope that forms has an atomic number that is 2 less than the original isotope's.
Answer: The parent isotope is undergoing alpha decay.
Explanation:
A nuclear reaction is defined as the reaction in which the changes in the nucleus of an atom take place and usually form a different element. An unstable nucleus undergoes various decay processes to attain stability.
Alpha decay is a type of decay process that happens when a heavy nucleus decays into a light nucleus with the release of an alpha particle. This alpha particle carries a charge of +2 units and has a mass of 4 units. It is also known as the helium nucleus. The general equation for this decay process is:
[tex]X_Z^A\rightarrow Y_{Z-2}^{A-4}+\alpha _2^4[/tex]
It is given that the daughter isotope formed has atomic number 2 less than the parent isotope. Thus, it is undergoing alpha decay.
Answer:
alpha decay because alpha particles have two protons and two neutrons
Explanation:
Edge
What Reaction type is CO2(g) + H2O() — H2CO3(aq)
Answer:
Explanation:
this is a decomposition reaction because here a compound is broken into two two parts.
0.444 mol C2H5OH= how many molecules
Explanation:
hope it make sense to u :)
Why is creativity important in scientific investigations?
a. Creative solutions are often needed to solve technical problems.
b. Scientists need to creatively adjust their data to prove their hypothesis.
c. There is no way to test a hypothesis, so creativity is necessary.
d. Most scientific experiments have no data.
Answer:
a. Creative solutions are often needed to solve technical problems.
Explanation:
Science in itself is a voyage of discovery. Scientific investigators focusing on various issues are often working hard to find creative solutions to complex technical problems.
In order to find solutions to all these problems bedeviling humanity, scientific investigators must be quite creative. Creativity is always at the bedrock of finding solutions to the complex technical problems of the world which happens to be the ultimate goal of science.
Hence, creativity is indispensable in scientific investigation and creative solutions are often needed to solve technical problems.
Answer:
a. Creative solutions are often needed to solve technical problems
Explanation:
Scientific investigation is the process using the scientific method which consists of empirical techniques in obtaining answers to question raised and used for driving the investigation
The scientist carrying out the investigation into the new area, is therefore required to be creative in adapting the available resources in answering the questions based on the scientific method
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7 u
Atomic mass = Mass of protons + mass of neutrons
⇒ Atomic mass = 4 u + 3 u = 7 u.
Tip: Electrons have negligible mass.
Mass of e- = 1/2000 × mass of p+.
Answer:
7
Explanation:
To find the Atomic Mass, you just add the protons and neutrons together.