Which of the following can’t be separated into simpler substances or converted into another substance by chemical processes?a. elements
b. compound
c. solution
d. suspension
e. colloid
Answers
The substances that can't be separated into simpler substances or converted into other substances by chemical processes are elements. They are fundamental substances and cannot be changed into other elements through chemical processes. The correct answer to the given question is option a. elements
The answer to your question is a. elements. In chemistry, elements are substances that cannot be separated into simpler substances or converted into another substance by chemical processes.
This is what makes them fundamental substances. Chemical processes can change compounds, solutions, suspensions, and colloids into different substances, but they cannot change an element into a different element. For example, hydrogen is an element that cannot be converted into any other element through chemical processes. It is fundamentally hydrogen.
The correct answer to the given question is option a. elements
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Which quantity identifies an element?1. Atomic number 2. Mass Number3. total number of neutrons in an atom of the element 4. total number of valence electrons in an atom of the element
A compound of carbon and hydrogen having one double covalent bond between two of the carbon atoms in the molecule is known as what type of hydrocarbon?
Net ionic equation for Lead acetate (II) + potassium chromate
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only during an eclipse
only when the sun is not out
during the day
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Answers
a. True
b. False
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1. Which of the following items represents a chemical change? burning melting evaporation freezing
Answer:
- Chemeical change: Burning
- Physical change: melting evaporation freezing
Explanation:
Chemical properties depend on composition while physical properties do not depend on composition. As in case of burning, composition changes due to this , this is chemical properties while freezing, melting and evaporating process, composition remain same, so these have physical properties, like water in liquid, ice and vapor state have same composition.
2. The physical properties of a compound are similar to those of its elements.
Answer:
- False
Explanation:
- The properties of compounds are often very different from the properties of the elements that make them. For example, water is made from two atoms of hydrogen bonded to one atom of oxygen. H2O have different physical properties than oxygen and hydrogen.
Final answer:
In the context of Chemistry, 'Burning' is a chemical change as it results in new substances. The claim that a compound's physical properties are similar to its elements is typically false as the properties often differ significantly, an example being the difference between water and its constituent elements hydrogen and oxygen.
Explanation:
The question falls under the field of Chemistry. It refers to the concept of chemical and physical changes in matter. A chemical change is a change in matter that results in the formation of one or more new substances with new properties. On the contrary, a physical change relates to a change in the state of matter without any change in its chemical composition. Out of the options given, the process of 'Burning' symbolizes a chemical change as it results in the formation of new substances such as carbon dioxide, water vapor, etc.
As for the second part of your question, the statement that 'physical properties of a compound are similar to those of its elements' is generally false. The properties of a compound often differ greatly from those of the constituent elements. One classic example is that of water (H2O). Water is a liquid at room temperature, quenches thirst, and is essential for life. However, its constituent elements - Hydrogen and Oxygen - are both gases and do not possess these characteristics.
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Answers
Answer:
no
Explanation:
it is not endothermic reaction
Answers
Final answer:
A glass rod is used in chemistry and biology laboratories for transferring liquids, stirring solutions, and manipulating microscopic organisms.
Explanation:
A glass rod is commonly used in chemistry and biology laboratories for various purposes. In chemistry, it can be used to transfer small amounts of liquids from one container to another without contamination. It is also used for stirring solutions and facilitating chemical reactions. In biology, a glass rod can be used for extracting small samples or manipulating microscopic organisms in a controlled manner.
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The molar mass is different from "mass"; 1 mole of NaOH is equal to 40.0g/mol.
When the question asks, what is the mass? It is referring to how many grams there are.
First, we are going to convert the molecules to atoms using Avogadro's number (=6.02 x 10^23)
(2.50 x 10^22 molecules) x (6.02 x 10^23 atoms) = 0.042 mol
Next, we are going to convert from moles to grams.
0.042 mol of NaOH x 40.0 g of NaOH/1 mole = 1.68g of NaOH.
There are 1.68 grams in 2.50 x 10^22 molecules of NaOH.
Hello!
What is the mass of 2.50 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?
Data:
Molar Mass of NaOH = 40 g/mol
Solving: According to the Law Avogradro, we have in 1 mole of a substance, 6.02x10²³ atoms/mol or molecules
1 mol -------------------- 6.02*10²³ molecules
y mol -------------------- 2.50*10²² molecules
Product of extremes equals product of means
Solving: Find the mass value now
40 g ----------------- 1 mol of NaOH
x g ------------- 0.042 mol of NaOH
Answer:
The mass is 1.68 grams
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