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
Ivenika [448]
3 years ago
14

You've asked your friends to define the terms "chemistry" and "chemical." With which definitions do you agree? Check all that ap

ply. Check all that apply. A chemical is a substance that has the same composition but different properties wherever it is found. Chemistry is the study of the composition, structure, properties, and reactions of matter. Chemistry is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy. A chemical is a substance that has the same properties but different composition wherever it is found.
Chemistry
1 answer:
OleMash [197]3 years ago
5 0

Answer:

  • A chemical is a substance that has the same composition and properties wherever it is found
  • Chemistry is the study of the composition, structure, properties, and reactions of matter

Explanation:

A chemical is made up of one or more chemical compounds that allow it to fulfill a particular function, because a chemical is a substance that has the same composition and properties wherever it is found.

Already Chemistry is a branch of the Natural Sciences that studies the matter, its properties, constitution, transformations and the energy involved in these processes. Matter, and all that composes it, is the main object of study of chemistry.

You might be interested in
Which statement is true about heat transfer? *
Mrrafil [7]

Answer: A

Explanation:

 heat always passes from a warmer object to a cooler object until all objects are the same temperature. Conduction is how heat travels between objects that are touching. Conduction travels fastest through solids, but liquids and gases can also conduct heat.

6 0
3 years ago
Based on the Valence Shell Electron Pair Repulsion Theory (or VSEPR), molecules will arrange to keep the following as far apart
elena55 [62]

Answer:

B. Valence Electron Pairs

Explanation:

Valence-shell electron-pair repulsion, or VSEPR, describes the shape of molecules by determining the repulsion of valence electrons. Therefore, our answer is B.

6 0
3 years ago
A compound containing Na, C, and O is found to have 1.06 mol Na, 0.528 mol C, and 1.59 mol O. What is the empirical formula of t
Effectus [21]

Given :

Moles of Na : 1.06

Moles of C : 0.528

Moles of O : 1.59

To Find :

The empirical formula of the compound.

Solution :

Dividing moles of each atom with the smallest one i.e 0.528 .

So,

Na : 1.06/0.528 = 2.007 ≈ 2

C : 0.528/0.528 = 1

O : 1.59/0.528 = 3.011 ≈ 3

Rounding all them to nearest integer, we will get the number of each atom in the empirical formula.

So, empirical formula is Na_2CO_3 .

Hence, this is the required solution.

5 0
3 years ago
A student is planning an investigation of an acid-base reaction. Which of the following is not an accepted method of monitoring
Dafna11 [192]

Answer:

Conductivity meter

Explanation:

A conductivity meter is normally used to measure the amount of electrical current or conductance in a solution. Conductivity is most useful in determining the overall health of a natural water body.

A pH paper is used to determine the pH of a solution. This is done by dipping part of the paper into a solution of interest and watching the color change. The pH paper comes in a color-coded scale indicating the pH that something has when the paper turns a certain color.

An indicator is an organic compound that changes its colour depending on the pH of the solution.

Since neutralization reaction can only be monitored by monitoring the pH of the solution, a conductivity meter cannot be used to monitor the progress of a neutralization reaction since it does not monitor the change in pH of the system under study.

6 0
3 years ago
The average atomic mass of Eu is 151.96 amu. There are only two naturally occurring isotopes of europium, Eu with a mass of 151.
earnstyle [38]

Answer:

The percentage abundance of Eu isotopes are 52 %  and 48 % .

Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope,:

% = x %

Mass = 151.0 amu

For second isotope :

% = 100  - x  

Mass = 153.0 amu

Given, Average Mass = 151.96 amu

Thus,

151.96=\frac{x}{100}\times {151.0}+\frac{100-x}{100}\times {153.0}

Solving for x, we get that:

x = 52 %

<u>Thus percentage abundance of Eu isotopes are 52 %  and 48 % .</u>

7 0
3 years ago
Other questions:
  • Which of the following is equal to 0.45 mm3? (B, right?)
    5·1 answer
  • 42.5 grams of an unknown substance is heated to 105.0 degrees Celsius and then placed into a calorimeter containing 110.0 grams
    9·1 answer
  • If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a
    5·2 answers
  • How many grams of solid Na2CO3 are required to neutralize exactly 2 liters of an HCI solution of pH 2.0?
    7·1 answer
  • When ethyl acetoacetate (CH3COCH2CO2CH2CH3) is treated with one equivalent of CH3MgBr, a gas is evolved from the reaction mixtur
    8·1 answer
  • 1. If 100 mL of a gas, originally at 760 torr, is compressed to a pressure of 120 kPa
    9·1 answer
  • 1 Point
    10·1 answer
  • What is the conjugate acid base pair for H20+HBR-&gt;H30+BR
    14·1 answer
  • Please help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    9·1 answer
  • Which of the following determines the type of tree species found in a temperate broadleaf forest? (Select all that apply.)
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!