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
Marat540 [252]
3 years ago
6

1. Isotopes of are atoms of the same element that vary in

Chemistry
1 answer:
Phantasy [73]3 years ago
6 0

Answer:

1. D

2. B

Explanation:

1. Isotopes vary in neutrons. Due to this variance, the difference in neutrons change the mass of the element.

Note: the amount of protons in an element never changes. The number of protons (the atomic number on the periodic table) identifies the element in question. If you add or subtract protons, you change the element.

2. B-10 and B-11 are two isotopes of the element Boron: One with 10 neutrons, and another with 11 neutrons. Because they contain a variance of neutrons, they do not have the same mass. This cancels choices A and D.

The protons of an element are equal to the atomic number of that element. Borons atomic number is 5 (according to the periodic table), so it contains 5 protons. This cancels choice C as the element with 6 protons is Carbon.

Note: The amount of protons in an atom is balanced out by the same amount of electrons to allow for a neutral charge of the element (i.e., the protons, which contain a positive charge, and electrons, which contain a negative charge, cancel each other out. In the case of Boron: +5 protons - 5 electrons = 0 charge). This is why choice B is correct, as the consideration of an ion is not necessary for this question.

You might be interested in
Question 3
stepladder [879]

This must be your work, otherwise it's against the Brainly code of conduct. If you need help finding a newspaper, go to BBC. They have plenty of relevant articles.

4 0
1 year ago
Andrew drew this diagram to show a certain type of weather front. Which type of front is it?
jolli1 [7]
Where is the diagram then I will be able to answer
5 0
3 years ago
Property is part of a system that does not depend on the size or the amount is called....
Reil [10]
The answer is A.extensive.
3 0
2 years ago
A solution is made
Anna11 [10]

Answer:

99.3%

Explanation:

The percent by mass of the solute can be expressed as:

  • % mass = \frac{MassSolute}{MassSolute+MassSolvent} * 100%

And for this problem:

  • Mass of Solute = Mass of sodium lithium chloride = 29 g
  • Mass of Solvent = Mass of Water

So to calculate the percent by mass first we need to <u>calculate the mass of water</u>, to do so we use its<em> density</em> (1 g/L):

  • 202 mL is equal to (202/1000) 0.202 L.

Density water = mass water / volume

  • 1 g/L = mass water / 0.202 L
  • Mass water = 0.202 g

Now we have all the data required to <u>calculate the % mass:</u>

  • % mass = \frac{29g}{29g+0.202g} * 100 % = 99.3%
3 0
3 years ago
Read 2 more answers
if you are asked to help the laboratory assistant in separating the mixture which method will you see?​
FromTheMoon [43]

Answer:

use secondary data. the normal method to use

3 0
2 years ago
Other questions:
  • Calcium carbonates are incorporated into the shells of microscopic marine plants and animals and then participate into the ocean
    11·1 answer
  • When preparing a TLC slide of a reference standard material (RSM), a solvent or mixture of solvents is used to dissolve the RSM
    9·1 answer
  • Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional
    7·1 answer
  • An atom or a group of atoms possessing a positive or negative electrical charge is called a(n
    15·1 answer
  • (Please answer ASAP) Describe in your own words A.) what does Inert mean? B.) why are noble gases Inert (include an explanation
    5·1 answer
  • A piece of glass is immersed in a liquid. It proceeds to float on the liquid's surface. This shows that the density of the glass
    14·1 answer
  • Calculate the kelvin scale equivalent of 123 Celsius?
    7·1 answer
  • Are substances that taste bitter and feel slippery to the skin
    9·1 answer
  • Sacar los números cuánticos de cobalto (Co)Z=27
    15·1 answer
  • Endothermic or exothermic
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!