1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
AlladinOne [14]
3 years ago
12

Indicate if the following statements are TRUE (T) or FALSE (F):

Chemistry
1 answer:
Aleks [24]3 years ago
3 0

Answer:

a) T

b) T

c) F

d) F

e) T

f) T

g) T

h) F

I) F

j) F

k) F

l) F

Explanation:

The w/v concentration is obtained from, mass/volume. Hence;

%w/v= 50/1000= 5%

In the %w/w we have;

25g/100 g = 25% w/w

In combustion reaction, energy is given out hence it is exothermic.

Neutralization reaction yields a salt and water

% by mass of carbon is obtained from;

8× 12/114 × 100 = 84.1%

All the ionic substances mentioned have very low solubility in water.

One mole of a substance contains the Avogadro's number of each atom in the compound.

There are two iron atoms so one mole contains 2× 55.85 g of iron.

Some sulphates such as BaSO4 are insoluble in water.

Halides are soluble in water hence NaI is soluble in water.

The equation does not balance with the given coefficients because the number of atoms of each element on both sides differ.

The equation represents a decomposition of calcium carbonate as written.

You might be interested in
Which of the following statements describes a difference between a chemical change and a physical change in a substance
siniylev [52]

Explanation:

A physical change is one that alters the physical properties of matter (particularly the form and state).

A chemical change is one in which new kind of matter is formed. It is always accompanied by energy changes (evolution or absorption of energy in form of heat or light or both).

Now, the salient differences between physical and chemical changes;

  1. Physical changes are easily reversible whereas chemical changes are not easily reversible.
  2. Physical changes lead to the production of no new kinds of matter whereas chemical changes leads to the production of new kinds of matter.
  3. Physical changes involves no change in mass whereas chemical changes involves change in mass.
  4. Physical changes require little energy whereas considerable amount of energy is needed for chemical changes.
8 0
3 years ago
How is DNA related to chromosomes????????????:/
makvit [3.9K]
They are both made up of the same protein called "histones". 
6 0
3 years ago
Read 2 more answers
How did uranium become present in Earth's upper crust? Choose one: A. It was delivered by comets that crashed into Earth's surfa
Luda [366]

Answer:

<em>Option A. It was delivered by comets that crashed into Earth's surface.</em>

Explanation:        

<em><u>Uranium (U) is a chemical element with atomic number 92.</u></em>        

<em />

<em>For many years, a large number of scientists have been studying the abundance and origin of the isotopes of uranium in Earth</em>. <u>According to some theories, the Earth's uranium was produced in one or more supernovae</u> (an explosive brightening of a star), in wich, the main process consists in the rapid capture of neutrons by seed nuclei at great rates. <u>Another theory proposes that uranium is created during the merger of two neutron stars</u> (neutron stars are very dense), because, when such dense bodies come closer together the gravitational force cause them to merge, producing huge amounts of hevy metals like uranium.                  

<u><em>Many analyses have been made of the uranium in rocks of the Earth. These measurements shows that the abundance of uranium is bigger in the crust and upper mantle of the Earth</em></u>.    

So, knowing that Earth's uranium was produced through one of these processes, <u><em>the best answer is option A, the uranium was delivered by comets that crashed into Earth's surface.</em></u>    

Have a nice day!                            

5 0
3 years ago
If stomach acid has a ph of 1.3, what is the pOH
Mekhanik [1.2K]
I think the answer is -12.7
6 0
3 years ago
Which equation is used to calculate the specific heat of the metal?
algol [13]

i dont know gjchhhhhhhhhhhhhhhhhhhhhhhhh

3 0
3 years ago
Other questions:
  • A 24.0 gram object has a volume of 6.0 mL. What is the density of the object?
    15·2 answers
  • An object accelerates 7.2 m/s2 when a force of 4.0 newtons is applied to it. What is the mass of the object?
    12·1 answer
  • How does a scientist use observations to help create the
    9·1 answer
  • Which two particles each have a mass approximately equal to one atomic mass unit?
    7·2 answers
  • A student wants to remove the salt from a mixture of sand and salt in order to get only pure sand. He adds water to the mixture.
    12·2 answers
  • Can bees really fly if so why
    13·1 answer
  • Which statements about salt water are true? Check all that apply.
    10·2 answers
  • ASAP HURRY FOR BRAINLIST
    10·1 answer
  • Explain radiation zone and convection zone.
    9·1 answer
  • What amount of heat is produced during the combustion of hexane if the temperature of the calorimeter increases by 4.542 k?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!