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
Salsk061 [2.6K]
3 years ago
13

why do you think you can find silver and gold on their own in rocks but calcium and magnesium are combined with other elements t

o make compounds such as calcium carbonate and magnesium sulfate?​
Chemistry
2 answers:
katrin [286]3 years ago
4 0

Explanation:

Silver and Gold belong to a special group of metals known as the native metals. They are found naturally on their own and not in combined form in rocks.

  • These metals are found uncombined because they are unreactive.
  • They prefer to alloy with themselves.
  • Calcium and magnesium on the other hand are reactive metals.
  • The unreactivity of these metals makes them uncombined in nature.
aniked [119]3 years ago
4 0

ihsusbydnuhzkuhd nuziw

You might be interested in
Which of these organisms is most likely 50 meters in size?
gregori [183]
I believe that the answer would be A. Tree
(Plus I took the assessment like this sooo, Im 100% this is correct)
7 0
4 years ago
Read 2 more answers
What are the H-bonds in Fentanyl, and is it souluable in water please explain yes or no.
Margarita [4]

Fentanyl is an opoid used for the pain medication together with other medications for anesthesia. It is illegally used as recreation drug as it is mixed with heroine and cocaine. The side effects of this fentanyl include vomiting, constipation, sedation, decreased breathing, hallucinations etc. Fentanyl does not have any hydrogen bonds instead it has nitrogen bonds associated with benzene ring. It does not form molecules within its molecules but forms hydrogen bonds with the water molecule. The nitrogen and the oxygen present forms bonds with the hydrogen of the water molecule. As it forms hydrogen bonds with water it is soluble in water.

5 0
4 years ago
Read 2 more answers
why is H2SO4 considered as strong acid? What colour does it give with phenolphthalein and methyl orange?​
Oksanka [162]
He said that i was like crying and he
4 0
3 years ago
Read 2 more answers
You may want to reference (Page) Section 12.4 while completing this problem. Enter the balanced chemical equation for the comple
alexandr1967 [171]

Answer:

See explanation

Explanation:

In this question, we have to remember that in all combustion reactions we will have <u>Oxygen</u> as reactive (O_2) and the products are <u>Carbon dioxide</u> (CO_2) and <u>Water</u> (H_2O). Additionally, for the states, we will have (l) for the <u>liquid state</u> and (g) for the <u>gas state</u>. So, we can analyze each reaction:

<u>Part A.</u>

The formula for nonane is C_9H_2_0, with this in mind we can write the combustion reaction:

C_9H_2_0_(_I_)~&#10;+~&#10;O_2~->~CO_2_(_g_)~&#10;+~H_2O_(_g_)

When we balance the reaction we will obtain:

C_9H_2_0_(_I_)~&#10;+~14 O_2_(_g_)~->~9CO_2_(_g_)~&#10;+~10H_2O_(_g_)

<u>Part B.</u>

The formula for 2-methylbutane is C_5H_1_2, with this in mind we can write the combustion reaction:

C5H12_(_I_)~&#10;+~O_2_(_g_)~->~CO_2_(_g_)~&#10;+~H2O_(_g_)

When we balance the reaction we will obtain:

C5H12_(_I_)~&#10;+~8O_2_(_g_)~->~5 CO_2_(_g_)~&#10;+~6 H2O_(_g_)

<u>Part C.</u>

The formula for 3-ethyltoluene is C_9H_1_2, with this in mind we can write the combustion reaction:

C_9H_1_2_(_I_)~+~O_2_(_g_)~->~CO_2_(_g_)~+~H2O_(_g_)

When we balance the reaction we will obtain:

C9H12_(_I_)~&#10;+~12O_2_(_g_)~->~9CO_2_(_g_)~&#10;+~6H2O_(_g_)

See figure 1 for further explanations.

I hope it helps!

8 0
3 years ago
Explain why scientists use shared characteristics to make cladograms.
Sauron [17]

 Scientist use synapomophies, or shared derived characters, to define cladograms. For instance, mammary glands are a shared characteristic of mammals. All mammals and their oldest common ancestor, had or have mammary glands.Thus, if we are looking at an unidentified animal and trying to place it in a cladogram, if it has mammary glands we know it belongs in that branch. Cladogram is a diagram used to represent a hypothetical relationship between groups of animals, called a phylogeny. A cladogram is used by a scientist studying phylogenetic systematics to visualize the groups of organisms being compared, how they are related, and their most common ancestors.  

3 0
3 years ago
Read 2 more answers
Other questions:
  • The work function of an element is the energy required to remove an electron from the surface of the solid element. The work fun
    7·1 answer
  • What is the overall order of reaction for this rate law: Rate = k ? zero first second third
    11·2 answers
  • In which type of chemical reaction do two or more substances combine to form one substance?
    8·2 answers
  • In a study of the following reaction at 1200 K it was observed that when the equilibrium partial pressure of water vapor is 15.0
    8·1 answer
  • Salt has a chemical formula of NaCI. Is salt a pure substance or mixture? Explain.
    6·1 answer
  • Predict the effect of adding a non competitive inhibitor to the reaction mixture on the rate of reaction at a high substrate con
    9·1 answer
  • Solve the following equation:13x - 22 = 30​
    10·1 answer
  • Hydrogen gas H2 is the least dense of all gases. A sample of H2 gas is found to occupy a volume of 1.23 L at 755 mmHg and 0 ◦C.
    11·1 answer
  • 8 points
    10·1 answer
  • What is the source of EXTERNAL energy for Earth's spheres and systems?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!