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
Rzqust [24]
2 years ago
5

Select the correct answer.

Chemistry
2 answers:
Svetlanka [38]2 years ago
6 0

C. A positive calcium ion and a negative oxygen ion

Mariulka [41]2 years ago
5 0

Answer:

C. a positive calcium ion and a negative oxygen ion

Explanation:

Ionic bonds are generally positive and negative because one is gaining electrons while the other is losing.

You might be interested in
Which of the conservationists discussed earlier in this unit is
Arte-miy333 [17]

The correct answer is A. The conservationist credited with founding the Wilderness Society is Bob Marshall.

Bob Marshall was an American forester, botanist, traveler, climber, writer and social activist who advocated the preservation of unspoiled wildlife.

 

He actively contributed to the development and adoption of environmental regulations prohibiting the construction of roads in vast federal specially protected natural areas. In 1935 he became one of the founders of the public environmental organization The Wilderness Society and its main sponsor.  

Today Bob Marshall is considered one of the main initiators of the wildlife movement in the United States. Several geographic features are named after him, including the Bob Marshall Wilderness Nature Reserve in Montana and the Marshall Mountain on the Adirondack Ridge.

Learn more in brainly.com/question/24828125

6 0
2 years ago
Read 2 more answers
When we destroy soil, it releases?
lord [1]

Answer:

Ch02

Explanation:

5 0
3 years ago
How might a fact be disproved? Are there some facts that will never be disproved
Paha777 [63]
A fact can be disapproved with further evidence different details. So basically evidence can change a fact!! Hope this helps
7 0
3 years ago
A great white shark has resided at a depth where the pressure is 16 atm. If the initial volume of its swim bladder is 4 L, what
padilas [110]

Answer:

The new volume of the gas is 32L

Explanation:

P1 = 16atm

V1 = 4L

P2 = atm

V2 = ?

According to Boyle's law, the volume of a given mass of gas is inversely proportional to its volume provided the temperature remains constant.

P1 * V1 = P2 * V2

V2 = (P1 * V1) / P2

V2 = (16 * 4) / 2

V2 = 64 / 2

V2 = 32L

The new volume of the gas is 32L

6 0
3 years ago
Acetylene burns in air according to the following equation: C2H2(g) + 5 2 O2(g) → 2 CO2(g) + H2O(g) ΔH o rxn = −1255.8 kJ Given
professor190 [17]

Answer:  -227 kJ

Explanation:

The balanced chemical reaction is,

C_2H_2(g)+\frac{5}{2}O_2(g)\rightarrow 2CO_2(g)+H_2O(g)

The expression for enthalpy change is,

\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]

\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+ n_{H_2O}\times \Delta H_{H_2O})]-[(n_{C_2H_2}\times \Delta H_{C_2H_2})+(n_{O_2}\times \Delta H_{O_2})]

where,

n = number of moles

\Delta H_{O_2}=0 (as heat of formation of substances in their standard state is zero

Now put all the given values in this expression, we get

-1255.8=[(2\times -393.5)+(1\times -241.8)]-[(1\times \Delta H_{C_2H_2})+(\frac{5}{2}\times 0)]

-1255.8=[(-787)+(-241.8)]-[(1\times \Delta H_{C_2H_2})+(0)]

\Delta H_{C_2H_2}=-227kJ

Therefore, the enthalpy change for C_2H_2 is -227 kJ.

7 0
3 years ago
Other questions:
  • A solution is made by dissolving 26.42g of (NH4)2so4 in enough h2o to make 50.00ml of solution
    5·2 answers
  • The state of matter for an object that has both definite volume and definite shape is
    8·1 answer
  • At what temperature is a gas likely to have the lowest rate of diffusion? 15° 21° 24° 30°
    7·2 answers
  • Intrutrusive rocks are formed when magma is squeezed in between other rocks true or false
    8·1 answer
  • How many significant figures are in 0.003450?
    10·1 answer
  • NEED HELP ASAP!!
    8·1 answer
  • Which of these household items is powered by alternating current?
    6·1 answer
  • Calculate the number of moles in 75 g of Glucose
    10·1 answer
  • Which of the following is a hypothesis for an experiment measuring solubility of sodium sulfate?
    15·1 answer
  • A lone pair must reside in which orbital type(s) to participate in resonance/conjugation/delocalization?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!