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
olchik [2.2K]
3 years ago
13

Provided is a list of five different substances. How many of these substances are elements?.

Chemistry
1 answer:
Lina20 [59]3 years ago
6 0

Answer:

118

Explanation:

Of these 118 elements, 94 occur naturally on Earth. Six of these occur in extreme trace quantities: technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.

You might be interested in
A child and her mother are at the park. The child walks around the rectangular park while her mom waits on a bench. The child re
RSB [31]
C 1,772 is the answer for the question

7 0
3 years ago
Read 2 more answers
Use the definition of molarity to calculate the concentration of 12.34 g of CaSO4 completely dissolved in water, with a solution
Ede4ka [16]

Answer:

[CaSO₄] = 36.26×10⁻² mol/L

Explanation:

Molarity (M) → mol/L → moles of solute in 1L of solution

Let's convert the volume from mL to L

250 mL . 1L/1000 mL = 0.250L

We need to determine the moles of solute. (mass / molar mass)

12.34 g / 136.13 g/mol = 0.0906 mol

M → 0.0906 mol / 0.250L = 36.26×10⁻² mol/L

8 0
3 years ago
Teniendo en cuenta los siguientes fenómenos: ebullición del agua- movimiento de un cuerpo- disolución de sal en agua- combustión
miv72 [106K]

Answer:

Las siguientes son reacciones químicas;

combustión de leña

oxidación del hierro

descomposición del agua en hidrógeno y oxígeno

Explanation:

Una reacción química da como resultado la formación de una (s) sustancia (s) nueva (s), mientras que un cambio físico no conduce a la formación de una sustancia nueva.

Las siguientes son reacciones químicas;

combustión de leña: la combustión de madera implica la oxidación del carbono según la reacción; C (s) + O2 (g) -------> CO2 (g)

oxidación del hierro: La oxidación del hierro conduce a la formación de óxidos de hierro. Como; 2Fe (s) + O2 (g) ----> 2FeO (s)

descomposición del agua en hidrógeno y oxígeno: esta es una reacción química en la que el agua se descompone de la siguiente manera; 2H2O (l) -----> 2H2 (g) + O2 (g)

Todos estos procesos enumerados anteriormente conducen a la formación de nuevas sustancias, por lo tanto, son reacciones químicas.

3 0
3 years ago
What is the common name of this?
drek231 [11]

Answer:

butyl alcohol

Explanation:

8 0
3 years ago
Which Of the following compounds is an electrolyte?
Anettt [7]
Hello,

Here is your answer:

The proper answer to this question is option D "<span>sodium hydroxide".

Here is how:

Sodium Hydroxide its a white substance that is a </span><span>electrolyte.

Your answer is D.

If you need anymore help feel free to ask me!

Hope this helps!</span>
8 0
3 years ago
Other questions:
  • Balance the following equation: (3pts) Al + HBr --&gt; AlBr3 + H2
    8·1 answer
  • What will happen to the gas pressure as the temperature increases, if the amount and volume of the gas are kept constant?
    7·1 answer
  • Which of the following is true of enzymes? Enzymes may require a nonprotein cofactor or ion for catalysis to take speed up more
    8·1 answer
  • 10 point + brainlyiest= 1 big thank u
    9·2 answers
  • A prehistoric pharmacist might have been called a
    9·1 answer
  • Convert to grams<br> 0.100 moles of Co2
    12·1 answer
  • Which class of organic compound is most likely to be used in anesthetics?
    12·2 answers
  • How to tell the difference between a physical and chemical change
    13·1 answer
  • Alisha organizes her data about the element lead into a table.
    12·2 answers
  • Help!!! pleaseeeee!!
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!