answer.
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
Stolb23
28 days ago
13

As part of an investigation, students combined substances in a beaker to observe chemical reactions. They performed two procedur

es. They measured the mass of each substance before and after each reaction. The table shows their observations.
Assuming the students did not make any careless errors, what likely explains these changes in mass?

A. Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into the air.

B. Procedure 1: One of the reactants was converted to thermal energy.
Procedure 2: All the products were liquids.

C. Procedure 1: The reactants were liquids with different densities.
Procedure 2: The reactants were combined into only one product.

D. Procedure 1: One of the products was a gas that escaped into the air.
Procedure 2: A gas from the air reacted with one of the other reactants.

Chemistry
2 answers:
lorasvet [2.5K]28 days ago
8 0

Response:

D.

Justification:

KiRa [2.6K]28 days ago
3 0

Answer: it's D

Explanation: I took a test and answered correctly.

You might be interested in
Suppose a 20.0 g gold bar at 35.0°C absorbs 70.0 calories of heat energy. Given that the specific heat of gold is 0.0310 cal/g °
VMariaS [2667]

The change in temperature can be expressed as:

T_2-T_1=\dfrac{q}{mC_p(Gold)}

By substituting in the known values, we arrive at:

T_2-T_1=\dfrac{70\ cal}{20\ g\times 0.0310\ cal/g^o\ C}\\\\T_2-T_1=112.90^oC\\\\T_2-35^oC=112.90^oC\\\\T_2=(112.90+35)^oC\\\\T_2=147.9^oC

Thus, we obtain the required answer.

6 0
10 days ago
Which of the following statements concerning the process of spontaneous folding of proteins is false?
KiRa [2678]

Answer:

(A) It can be a fundamentally arbitrary process.

Explanation:

In various human disorders, the natural process of protein folding may malfunction, generally beginning with the formation of a very compact state. This process may also include a systematic decrease in the variety of conformational states and the initial creation of localized structures. Thus, option (A) is the only incorrect statement.

8 0
27 days ago
Read 2 more answers
Según la Organización Mundial de la Salud, el nitrato de plata ( densidad = 4.35 g/cc ) es una sustancia con propiedades cáustic
castortr0y [2720]

Respuesta:

737.52 mL de agua

Justificación:

En este escenario, es necesario aplicar la fórmula de molaridad de una solución, que es:

M = moles / V

Donde:

V: Volumen de la solución.

Ya que deseamos determinar la cantidad de agua, en otras palabras, buscamos el volumen del solvente que se utilizó para crear los 800 mL de la disolución.

Una disolución se compone de un soluto y un solvente. El soluto que tenemos es nitrato de plata. Utilizando la fórmula mencionada, calculamos los moles de soluto y luego su masa. Tras eso, calculamos el volumen a partir de la densidad y, al final, determinamos la cantidad de solvente de esta manera:

V ste = Vsol - Vsto

Primero, vamos a calcular los moles de soluto:

moles = M * V

moles = 2 * 0.800 = 1.6 moles

Con este número de moles, obtenemos la masa utilizando el peso molecular que es 169.87 g/mol:

m = moles * PM

m = 1.6 * 169.87 = 271.792 g

Usando el valor de densidad, procederemos a calcular el volumen de soluto utilizado:

d = m/V

V = m/d

V = 271.792 / 4.35

V = 62.48 mL

Por último, la cantidad de agua requerida es:

V agua = 800 - 62.48

V agua = 737.52 mL

8 0
20 days ago
1. Use the following thermochemical equation.
KiRa [2678]

Answer:

There's a lot to address, so I'm uncertain if I can tackle this; it feels overwhelming. Perhaps you could simplify it for me as it's quite extensive.

Explanation:

  • I wish I had the answers.
  • It's too complex.
  • This chemistry isn't familiar to me.
  • If you have another chemistry-related question, feel free to ask.
  • This is just too difficult.
7 0
1 month ago
Which atom in the ground state has five electrons in its outee level and ten electrons in its kernel (1) C (2) Cl (3) Si (4) P
Tems11 [2387]
When examining its electronic configuration, the last digit should be five, suggesting configurations like (2,5), (2,8,5), or (2,8,8,5), among others.

Thus, elements that end with the number 5 in their outer shell include N, P, As, Sb, Bi, Uup. Based on the choices presented, the probable answer is option 4) Phosphorus.
4 0
26 days ago
Other questions:
  • What evidence is there from your results that the characteristic color observed for each compound is due to the metal ion in eac
    14·1 answer
  • If 75.0% of the isotopes of an element have a mass of 35.0 amu and 25.0% of the isotopes have a mass of 37.0amu what is the atom
    10·2 answers
  • How many grams of nano3 would you add to 500g of h2o in order to prepare a solution that is 0.500 molal in nano3?
    10·1 answer
  • Suppose you have a bucket of sand containing 5.5 billion grains of sand ( 5.5×109 grains). Most of the grains of sand are white,
    5·1 answer
  • Which statements accurately describe soap? Select one or more:
    5·1 answer
  • Children’s chewable tylenol contains 80 mg of acetaminophen per tablet. if the recommended dosage is 10 mg/kg, how many tablets
    13·2 answers
  • Chlorine atoms from CFC molecules speed the breakdown of stratospheric O3 in a process that is affected by both homogeneous and
    7·1 answer
  • Why is it important to ensure that treated water remains safe to drink when it is stored after treatment? what is one way to mak
    5·1 answer
  • An open box of bandages is on the floor bandage wrappers are found nearby <br> chemical treatment
    9·2 answers
  • A mixture of KCl and KNO3
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!