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
saul85 [17]
3 years ago
7

How does calcium obey the octet rule when reacting to form compounds?. A. It gains electrons. B. It does not change its number o

f electrons. C. It gives up electrons. D. It fills its valence level. E. It shares electrons.
Chemistry
2 answers:
agasfer [191]3 years ago
8 0

Ca belongs to group 2 in the periodic table.

the electronic configuration of Ca is - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Ca has 2 valence electrons in its outermost shell. Octet rule is when the outermost shell of the atom is complete with 8 electrons, that means both s and p subshells are complete.

for Ca to obey the octet rule its outermost shell should have 8 electrons.

therefore Ca should give up the 2 electrons in its outermost shell.

then the 3rd energy shell is the outermost shell with 8 electrons.

the correct answer is C. It gives up electrons.

S_A_V [24]3 years ago
7 0

Answer:

C. It gives up electrons.

You might be interested in
Forest food web………….
vodka [1.7K]

Forest Food web consists of the producers, main consumers, secondary consumers, scavengers, and decomposers. Food web is the collection of the large number of food chains.

<h3>What are some examples of food webs?</h3>

Numerous food chains make up a food web. As animals seek food, a food chain only follows one way. As an example, a hawk consumes a snake following the consumption of a frog, a grasshopper, and grass. A food web illustrates the numerous relationships between plants and animals.

<h3>What are the different types of food web?</h3>

1. Primary consumers

2. Secondary consumers

3. Tertiary consumers

4. Decomposers or phytoremediators

To know more about the Forest food chain visit:

brainly.com/question/27437378

#SPJ9

5 0
1 year ago
If you are at the top of Mount Everest, can you have a really hot cup of hot chocolate?
matrenka [14]

Answer:

Yes, you can

Explanation:

When you climb Mount Everest, you need lots of energy. The higher you climb, the more your appetite goes down. You will need as much energy as you can get.

7 0
3 years ago
A chemistry teacher is able to grade chemistry labs at a rate of 5 labs for every 3 minutes. They need to grade 165 labs how man
PIT_PIT [208]

Answer:

1.65hr

Explanation:

Given parameters:

Number of labs  = 5 labs

 Time taken  = 3 minutes

Unknown:

Time taken in hours to grade 165 labs  = ?

Solution:

Let us find the rate of the teacher;

  Rate  = \frac{number of labs}{time}  

  Insert the parameters and solve;

   Rate  = \frac{5}{3}   = 1.67labs/min

Now;

   Time to grade 165 labs  = \frac{number of labs}{rate}  

   Time to grade 165 labs  = \frac{165}{1.67}   = 98.8min

  Since;

               60min = 1hr

               98.8min  = \frac{98.8}{60}   = 1.65hr

3 0
3 years ago
Why is it important for people to understand how to properly dispose of waste in a watershed?
Natali [406]

Answer:

disposing waste properly is important because watersheds are the surface water features and stormwater runoff within a watershed which ultimately end up in other bodies of water. It is essential to consider these downstream impacts when developing and implementing water quality protection and restoration actions. Everything upstream ends up downstream

Explanation:

A watershed describes an area of land that contains a common set of streams and rivers that all drain into a single larger body of water, such as a larger river, a lake or an ocean. For example, the Nile River watershed is an enormous watershed

5 0
4 years ago
How many grams of an 8% w/w progesterone gel must be mixed with 1.45 g of a 4% w/w progesterone gel to prepare a 5.5% w/w gel?
Nimfa-mama [501]

Answer: 0.87 g of an 8% w/w progesterone gel must be mixed with 1.45 g of a 4% w/w progesterone gel to prepare a 5.5% w/w gel.

Explanation:

According to the dilution law,

C_1w_1+C_2w_2=C_3w_3

where,

C_1 = concentration of ist progesterone gel = 8%w/w

w_1 = weight of ist progesterone gel  = x g

C_2 = concentration of another progesterone gel  = 4% w/w

w_2 = weight of another progesterone gel = 1.45 g

C_3 = concentration of resulting progesterone gel  = 5.5%w/w

w_3 = weight of resulting progesterone gel  = (x+1.45) g

8\times x+4\times 1.45=5.5\times (x+1.45)

x=0.87

Thus 0.87 g of an 8% w/w progesterone gel must be mixed with 1.45 g of a 4% w/w progesterone gel to prepare a 5.5% w/w gel.

4 0
4 years ago
Other questions:
  • List of all the information you Can extract from the periodic table for the element gold
    10·1 answer
  • Which of the following pairs of reactants is not correctly listed with its product solution? A. Weak base-strong acid reactants—
    7·2 answers
  • True or false the strength and concentration of an acid or base describe the same property.
    15·2 answers
  • A scientist finds a fossil that she thinks might make a good index fossil. Which characteristics does this fossil most likely ha
    8·1 answer
  • How would you describe a particle of alpha radiation?
    14·1 answer
  • 2. ATO kg bouting ball would require what force to accelerate down an alleyway at a rate of ons?
    5·1 answer
  • HOW MANY ATLMS ARE IN 5.6 miles of Na? PLSSSS!!!! ITS DUE AT 5!! how do I solve these? 2-5
    12·1 answer
  • How many grams of Ag2S
    13·1 answer
  • What is the quantity of heat evolved when 15g of CH4 is completely burned in air? Given that CH4+2O2→ CO2+2H2OΔH=-890Kj/mol
    6·1 answer
  • The original source of energy for this pond area
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!