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
Tatiana [17]
3 years ago
6

Which of the following statements is true?

Chemistry
1 answer:
12345 [234]3 years ago
8 0

Answer:

c. Hfus is always negative.

Explanation:

Because energy is released when fusing solids

You might be interested in
It's sunny in New York But it is cooL During the first part of the week, we might find this lizard basking in the sun
Leni [432]
Cold blooded animal? it’s a bit vague sorry
5 0
3 years ago
Is sugar (C12H22O11) an element or a compound?
Semmy [17]
I believe that sugar is a compound because there are elements that make up sugar
4 0
4 years ago
(a)-Use Lewis symbol store present there action that occurs between Ca and F atoms. (b)-What is the chemical formula of the most
Charra [1.4K]

Answer:

(a) The Lewis structure is shown in the image below.

(b) CaF_2

(c) Calcium loses 2 electrons to 2 atoms of fluorine and these 2 atoms of fluorine accepts each electron to form ionic bond.

(d) Calcium atom loses electrons.

Explanation:

Calcium is the element of second group and forth period. The electronic configuration of Calcium is - 2, 8, 8, 2 or 1s^22s^22p^63s^23p^64s^2

There are 2 valence electrons of Calcium.

Fluorine is the element of group 17 and second period. The electronic configuration of the element fluorine is - 2, 7 or  1s^22s^22p^5

There is 1 valence electron of fluorine.

The Lewis structure is drawn in such a way that the octet of each atom is complete.  

Thus, calcium loses 2 electrons to 2 atoms of fluorine and these 2 atoms of fluorine accepts each electron to form ionic bond. This is done in order that the octet of the atoms are complete and they become stable.

Thus, the formula of calcium chloride is CaF_2.

<u>(a) The Lewis structure is shown in the image below.</u>

<u>(b) CaF_2</u>

<u>(c) Calcium loses 2 electrons to 2 atoms of fluorine and these 2 atoms of fluorine accepts each electron to form ionic bond.</u>

<u>(d) Calcium atom loses electrons.</u>

5 0
3 years ago
What determines an atom's reactivity?
vovikov84 [41]

Answer:

D) How many valence electrons the atom contains.

This is the only closest one

because the number of electrons in the outermost shell is the correct answer

4 0
3 years ago
Read 2 more answers
An oxide of nitrogen contain its own volume of nitrogen
kirill115 [55]

Answer:

NO2 is the molecular formula  of nitrogen Oxide​

Explanation:

Correct question

An oxide of nitrogen contain its own volume of nitrogen

its vapour dentity is 23. Find the molecular formula

Of nitrogen Oxide

Solution

As we know

Molecular Weight  is equal to two times the  vapour density

Hence, the molecular weight of Oxide of nitrogen is 2 * 22 = 44

Molecular weight of Oxide of nitrogen  is the sum of atomic weight of nitrogen and oxygen

Molecular weight of Oxide of nitrogen = 14 + 16 *Y

14 + 16 *Y  = 46

Y = 2

Hence, the formula is NO2

4 0
3 years ago
Other questions:
  • Jack researched J.J. Thomson’s experiments. Read Jack’s summary below and find the error.
    14·1 answer
  • Homework 3 Write the balanced equations. Calculate how many grams of each reactant will be needed to obtain 100.0 grams of the i
    7·1 answer
  • Calculate the percent ionization of nitrous acid in a solution that is 0.222 M in nitrous acid (HNO3) and 0.278 M in potassium n
    8·1 answer
  • If you were asked to convert 4.2 × 1022 atoms of aluminum to moles, which of the following should you use for the conversion?
    12·2 answers
  • For an ideal gas condition, what is the mass (g) of N2 if the pressure is 2.0 atm, the volume is 25 mL and the temperature is 29
    8·1 answer
  • Evaporation is a process that requires energy to occur. Evaporation is ain)<br> reaction
    6·1 answer
  • How many atoms, ions, or molecules are in a 1 molar solution?
    11·1 answer
  • This graph represents an endothermic reaction. What does it show about the potential energy of reactants and products? Abuzua nu
    11·1 answer
  • Organize the following list of atoms from lowest to highest Electronegativity:
    14·1 answer
  • Urgent!! will give brainliest!!
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!