During a chemical reaction, mass and energy are both: increased. decreased. consumed. conserved.

QUESTION POSTED AT 13/02/2020 - 11:52 AM

Related questions

The correct answer is c. Energy processing from corn biofuels is not energy efficient.

Exellent!!!!!!!!!!!!!!

ANSWERED AT 28/02/2020 - 05:17 PM


QUESTION POSTED AT 28/02/2020 - 05:17 PM

Question 1 what happens during a neutralization reaction?

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.

  • New substances called SALTS and water are formed in neutralization reactions.
  • For example, hydrochloric acid and sodium hydroxide solution react together to form water and sodium chloride solution. The H+ ions and OH– ions produce the water, and the Na+ ions and Cl– ions produce the sodium chloride, NaCl(aq).

ANSWERED AT 28/02/2020 - 05:11 PM


QUESTION POSTED AT 28/02/2020 - 05:11 PM

Every chemical reaction involves a change in

A chemical reaction is when you cant change something back to the way it was before 

ANSWERED AT 28/02/2020 - 05:09 PM


QUESTION POSTED AT 28/02/2020 - 05:09 PM

Amino acids cannot be broken down to provide energy.

False, Dietary proteins are first broken down to individual amino acids by various enzymes and hydrochloric acid present in the gastro-intestinal tract. These amino acids are further broken down to α-keto acids which can be recycled in the body for generation of energy, and production of glucose or fat or other amino acids.

ANSWERED AT 28/02/2020 - 04:42 PM


QUESTION POSTED AT 28/02/2020 - 04:42 PM

What is the molarity of a solution of kno3 (molecular mass = 101 that contains 404 grams of kno3 in 2.00 liters of solution? a 1.00 b 2.00 c 0.500 d 4.00?

(1 mol KNO3/ 101 g KNO3)(404 g KNO3)= 4 moles
D

ANSWERED AT 28/02/2020 - 04:37 PM


QUESTION POSTED AT 28/02/2020 - 04:37 PM

What is the chemical symbol for nitrogen and oxygen?

N2 and O2

hope it helps

ANSWERED AT 28/02/2020 - 04:26 PM


QUESTION POSTED AT 28/02/2020 - 04:26 PM

A certain vinegar is 6.02% acetic acid (hc2h3o2, by mass. how many grams of acetic acid are contained in a 355 ml bottle of vinegar. assume a density of 1.01 g/ml.

First, determine the amount of vinegar in grams by multiplying the volume by the density. That is,
                                        mass = (355 ml) x (1.01 g/mL) = 358.55 g
Then, multiply the calculated mass above by the decimal equivalent of the given percentage above. 
                      amount of acetic acid = (358.55 g)(0.0602) = 21.58 g

ANSWERED AT 28/02/2020 - 04:11 PM


QUESTION POSTED AT 28/02/2020 - 04:11 PM

Nuclear energy is produced when scientists force uranium (U) atoms to break apart. With this in mind, examine the list below. If scientists were to break apart each of the items on the list, which items would still be classified in the same way? Which items would be classified differently? • atoms • elements • compounds • molecules • matter

Answer:

Compound.

Explanation:

A compound is a made up of two or more than two different elements. It can be broken down into smaller molecules.Elements are combined to form a compound by chemical bonding like ionic bonding and covalent bonding.

Different compounds of different elements can be broken down into the chemical reaction called decomposition reaction. For example:

Using electrolysis, we can break down water into its elements hydrogen and oxygen.    

ANSWERED AT 28/02/2020 - 04:06 PM


QUESTION POSTED AT 28/02/2020 - 04:06 PM

What chemical is in plastic bottle and how it affect humans?

BPA, or bisphenol A, is in most plastics and it is toxic to humans because it can bind to the estrogen hormone and greatly alter your body's natural functions from there. It can also bind to your thyroid hormone.

ANSWERED AT 28/02/2020 - 03:44 PM


QUESTION POSTED AT 28/02/2020 - 03:44 PM

Write the symbol for every chemical element that has atomic number less than 74 and atomic mass greater than 173.8u

You should be able to locate them on the periodic table as long as you know which part the atomic number is and which part the atomic mass is.

ANSWERED AT 28/02/2020 - 03:22 PM


QUESTION POSTED AT 28/02/2020 - 03:22 PM

What chemicals are released by burning oil, and how are they harmful?

Carbon dioxide, carbon monoxide, lead, nitrogen oxides, particulate matter, polycyclic aromatic hydrocarbons, sulfur dioxide , and volatile organic compounds.
They are harmful to human health.

ANSWERED AT 28/02/2020 - 03:11 PM


QUESTION POSTED AT 28/02/2020 - 03:11 PM

Classify this chemical equation as a combination/synthesis , decomposition, single replacement, double replacement, or combustion. Pb(s) + Hg2SO4(s) --> PbSO4(s) +2 Hg(l)

S is for soil,cl (sometimes c) represents climate,o organisms including humans,r relief,p parent material, or lithology, andt time.

ANSWERED AT 28/02/2020 - 03:10 PM


QUESTION POSTED AT 28/02/2020 - 03:10 PM

Describe four ways you could increase the rate of a chemical reaction.

1. Increase the temperature  

2. Increase the pressure of an reacting gas  

3. Solid reactants are broken into smaller pieces

4. The concentration of a dissolved reactant is increased.

ANSWERED AT 28/02/2020 - 03:06 PM


QUESTION POSTED AT 28/02/2020 - 03:06 PM

During a chemical reaction, energy is converted from one form to another increases decreases is used up as bonds are broken and formed

Is used up as bonds are broken and formed .

ANSWERED AT 28/02/2020 - 03:02 PM


QUESTION POSTED AT 28/02/2020 - 03:02 PM

The specific heat of nickel is 0.44 J/g*⁰C. How much energy needed to change the temperature of 95.4g of nickel from 22⁰C to 32⁰C. Is the energy absorbed or released?

Answer : The amount of energy needed is, 419.76 J and the energy is absorbed.

Solution :

Formula used :

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

where,

Q = heat gained or absorbed = ?

m = mass of nickel = 95.4 g

c = specific heat of nickel = 0.44J/g^oC      

\Delta T=\text{Change in temperature}  

T_{final} = final temperature = 32^oC

T_{initial} = initial temperature = 22^oC

Now put all the given values in the above formula, we get

Q=95.4g\times 0.44J/g^oC\times (32-22)^oC

Q=419.76J

The value of Q is positive that means energy is absorbed.

Therefore, the amount of energy needed is, 419.76 J and the energy is absorbed.

ANSWERED AT 28/02/2020 - 02:51 PM


QUESTION POSTED AT 28/02/2020 - 02:51 PM

Arrange the following foods in order of increasing acidity : beets. PH=5.9;Camembert cheese,PH=7.4;egg white,pH=8.0;sauerkraut,PH=3.5;yogurt,PH=4.5

Egg white, Camembert cheese, beets, yogurt, sauerkraut

ANSWERED AT 28/02/2020 - 02:47 PM


QUESTION POSTED AT 28/02/2020 - 02:47 PM

What type of reaction is radioactive decay? 1zero order 2first order 3second order 4third order

2. first order reaction
Hope I helped! :)

ANSWERED AT 28/02/2020 - 02:46 PM


QUESTION POSTED AT 28/02/2020 - 02:46 PM

What is an example of where energy transfer by conduction is a curringNOW ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

If you're feeling cold and you cuddle someone you'd feel better because the heat is transferred from their body to yours

ANSWERED AT 28/02/2020 - 02:42 PM


QUESTION POSTED AT 28/02/2020 - 02:42 PM

When you do a displacement reaction with iron and copper what is the orange metal called

It is called rust and it forms when water soaks into the metal forming a chemical reaction.

ANSWERED AT 28/02/2020 - 02:21 PM


QUESTION POSTED AT 28/02/2020 - 02:21 PM

What happens during a neutralization reaction?

Protons and hydroxide combined to create water molecules while the remaining ions.

ANSWERED AT 28/02/2020 - 02:17 PM


QUESTION POSTED AT 28/02/2020 - 02:17 PM

How many electrons are needed to completely fill the second level energy? The third? The fourth?

The maximum number of electrons that an energy level can hold is determined from the formula 2n^2 equals the total number, where n is the energy level.  The first energy level holds 2*1^2=2 electrons while the second holds 2*2^2= 8 electrons.

ANSWERED AT 28/02/2020 - 02:04 PM


QUESTION POSTED AT 28/02/2020 - 02:04 PM

How do decomposers interact with producers and consumers in an ecosystem

Best Answer: producers use nutrients in the soil > consumers eat the producers, obtaining the energy and nutrients that the plant took > the consumer dies and is decomposed by a decomposer (usually decomposing bacteria), which replaces the nutrients back into the soil > producers use the nutrients in the soil.

now put that into your own words; if you cant, try drawing pictures to help you :) that might help you revise too, but remember to add info underneath, otherwise you might not understand it when you come back to it later

ANSWERED AT 28/02/2020 - 01:08 PM


QUESTION POSTED AT 28/02/2020 - 01:08 PM

Lifting a ball increases its what energy

Gravity because when you drop the gravity from the earth forces the ball down...but when yuo add more as in lifting the ball higher it becomes the gravtiy becomes stronger

ANSWERED AT 28/02/2020 - 01:00 PM


QUESTION POSTED AT 28/02/2020 - 01:00 PM

A ______ is a machine that converts mechanical energy to electrical energy. A. transmitter B. pulverizer C. generator

C.generator is the answer

ANSWERED AT 28/02/2020 - 12:47 PM


QUESTION POSTED AT 28/02/2020 - 12:47 PM

The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in this sample? a) 1.00 b) 18.0 c) 36.0 d) 324

Number of moles = Given Mass / Molar mass

Here, Given mass = 18 g
Molar mass = 18 g/mol

Substitute their values, 
n = 18/18
n = 1 mol

In short, Your Answer would be: Option A

Hope this helps!

ANSWERED AT 28/02/2020 - 12:46 PM


QUESTION POSTED AT 28/02/2020 - 12:46 PM