PLEASE HELP

Which chemical reaction supports the Law of Conservation of Mass?

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.

Answer:30.573 Billion atoms are in one gram

Explanation:

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:

Answer:

D

Explanation:

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Answer:

the answer is D

Explanation:

I hope this helped.

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

pls give brainliest

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

Explanation:

As the altitude increases, the pressure and the density of the atmosphere decrease.

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

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

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

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.

Answer:

Explanation:

this is a decomposition reaction because here a compound is broken into two two parts.

Answer:

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

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.

Explanation:

hope it make sense to u :)

Answer:

having a smooth or lubricated surface may help decrease friction.

Explanation:

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.

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.

Answer:

y8y g8c g u to give give g gu tu tvtc8 ug fu t 7f to fu t7 to to tutorials

Explanation:

v8y to c g. fu uf gu t8 g8. g8 u g 8 g gi gi gi g gi if fu%:/"

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.

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:

https://brainly.com/question/12047033

#SPJ2

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:

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

Answer:

second one

Explanation

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.

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.