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dybincka [34]
2 years ago
13

Which element will react with cold water? (a) sodium (b)calcium (c)zinc (d)iron (e)copper (g)mercury

Chemistry
1 answer:
rjkz [21]2 years ago
3 0

The answer is a) sodium!

You might be interested in
Which of the following numbers count as exact numbers and do not count when determining significant figures in a calculation? 1.
rewona [7]

Answer :

(1) Density do not count as exact number.

(2) Volume count as exact number.

(3) Length count as exact number.

(4) Speed do not count as exact number.

(5) Number count as exact number.

(6) Mass do not count as exact number.

Explanation :

Exact numbers : It is a defined or integer value which comes from counting numbers of objects.

They have an infinite number of significant figures.

For example : 12 eggs in a dozen, 1000 g in a kilogram and 2.54 cm in an inch.

Now we have to determine the following numbers count as exact numbers.

(1) Density : 3.7 g/mL

Density do not count as exact number.

(2) Volume : 1000 mL/L

Volume count as exact number.

(3) Length : 2.54 cm/in

Length count as exact number.

(4) Speed : 65.2 km/hr

Speed do not count as exact number.

(5) Number : 14 aardvarks

Number count as exact number.

(6) Mass : 38.741 g

Mass do not count as exact number.

4 0
3 years ago
A community consists of all the organisms in an ecosystem that belong to the same species.
choli [55]

Answer:

False

Explanation:

A community consists of all the organisms in an ecosystem that belong to the same species. Population density occurs when two or more organisms seek the same resource at the same time. A carrying capacity is anything that restricts the number of individuals in a population.

3 0
2 years ago
Read 2 more answers
Use Lewis theory to determine the chemical formula for the compound formed between Sr and N.
mariarad [96]

Answer:

Sr_3N_2

Explanation:

Hello,

In this case, since the Lewis theory is based on the bonds formation between atoms via the valence electrons, we can verify the chemical formula of the compound formed by strontium and nitrogen by noticing that strontium has two valence electrons as it is in group IIA, for that reason, two nitrogens should be available for bonding. Therefore, since nitrogen is in group VA, it is said that three electrons are required to attain the octet (maximum amount bonded electrons), for that reason, three strontiums are should be available for bonding. In such a way, the formula should be:

Sr_3N_2

Regards.

8 0
3 years ago
What is a covalent compound? physical science?
umka21 [38]
Covalent compounds are formed when non metals bond together.
4 0
3 years ago
Explain why are all valence electrons are either in an s or p orbital.
ahrayia [7]

They are two representatives of the sublevels/energy levels.

4 0
2 years ago
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