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
nikklg [1K]
2 years ago
13

1. Take a look at all the elements in period 3. What do you notice? *

Chemistry
2 answers:
Vedmedyk [2.9K]2 years ago
5 0

Answer:

D

Explanation:

beacause all the elements in period 3 has different valence electrons hence you look at the first element in period 3 is sodium which has a valence electron of 1 when you go across the period to the right their valence electron decreases to be negative

Lelu [443]2 years ago
4 0

Answer:

D is the correct answer i hope this is correct

You might be interested in
Give 7 and example of how each wave in the EM spectrum in used in our daily lives
bogdanovich [222]
1. it’s use for our food in like microwaves and ovens
2. airplanes are guided by radar waves,
3.the tv is used by electromagnetic waves
4. they are used in heaters,
5.infrared cameras which detect people in the dark
6.Allows airport security to observe the internal contents of objects and luggage using airport scanners
7.doctors use electromagnetic waves in x-rays
8 0
3 years ago
use the heisenberg uncertainty principle to calculate the uncertainity in meters in the position of 0.68g and traveling at a vel
My name is Ann [436]

Answer:

7.7439×10⁻³¹ m

Explanation:

The expression for Heisenberg uncertainty principle is:

\Delta x\times \Delta v=\frac {h}{4\times \pi\times m}

Where m is the mass of the microscopic particle

h is the Planks constant

Δx is the uncertainty in the position

Δv is the uncertainty in the velocity

Given:

mass = 0.68 g = 0.68×10⁻³ kg

Δv = 0.1 m/s

Δx= ?

Applying the above formula as:

\Delta x\times 0.1=\frac {6.62\times 10^{-34}}{4\times \frac {22}{7}\times 0.68\times 10^{-3}}

<u>Δx = 7.7439×10⁻³¹ m</u>

8 0
3 years ago
A filament of a light bulb is made from a pure sample of tungsten.
GenaCL600 [577]

Answer:

The correct options are:

1) Pure chemical substance

2) Element.

Explanation:

each of the term is explained below:

1) <u>Mixture: </u> Since tungsten is an element in periodic table thus it is not a mixture.

2) False by definition of mixture.

3) false by definition of mixture.

4) <u>Solution:</u> Tungsten in a filament is in solid form hence solution is incorrect.

5) Since it is given in the question itself that the sample is pure hence option 'E' is correct as chemical substance is a pure substance that has a homogeneous composition and the sample in the question is given as pure.

6) <u>Compound:</u> By definition of compound it is formed by mixing 2 or more elements but since tungsten is an element that occurs independently in nature hence it is not a compound.

7) Tungsten is a element in the periodic table with atomic number 74.

8 0
3 years ago
How many moles are in 7.46 x 1025 particles of iron
sladkih [1.3K]

Answer:

1 mole of iron =6.023×10^23 particles

1 particles of iron=1/6.023×10^23 mole

7.46×10^25 particles =1/6.023×10^23×7.46×10^25

=1.238×10^48 mole is a required answer.

4 0
2 years ago
Help naming this plzzzzzzzzzzzzz
mamaluj [8]

Answer:

A. 3-chloro-1-methylcyclobutane.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to infer that the name of this compound is A. 3-chloro-1-methylcyclobutane because of the fact that the parent chain is a cyclobutane which starts by the methyl radical as it has the priority over the chlorine radical which is actually named first at the third carbon (clockwise).

Therefore the name is given in A, accordingly to the IUPAC rules of nomenclature.

Regards!

5 0
3 years ago
Other questions:
  • The normal boiling point for h2se is higher than the normal boiling point for h2s . this can be explained by
    13·1 answer
  • What is essential to living things because many of the chemical reactions that occur in living things require it?
    6·2 answers
  • As the pressure on a sample of gas increases, the volume of the sample _____.
    13·2 answers
  • Explain why lithium is a strong reducing agent, whereas fluorine is a strong oxidizing agent.
    10·1 answer
  • A 25.0 mL sample of 0.150 M hypochlorous acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point?
    10·1 answer
  • What mineral is used in paint and roofing, is nonmetallic, has cleavage, and a hardness of 2?
    12·1 answer
  • Write a balenced chemical equation for the reaction: include abbreviation for the physical states-
    5·1 answer
  • What is the molecule that formed between B and F?
    10·1 answer
  • What is the name of the following compound - AgNO3 *
    13·1 answer
  • Why is biodiversity important?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!