IDK these help pls
1. Which of the following is a compound?
A. O2
B. NH3
C. H2O+NaCl
D. N2
2. What is the difference between compounds and mixtures?
A. Compounds contain only one element; mixtures contain two or more elements.
B. Compounds contain two or more elements; mixtures contain only one element.
C. Compounds contain elements bonded together to form a new substance; mixtures contain elements that are combined but not bonded.
D. Compounds contain elements that are combined but not bonded; mixtures contain elements bonded together to form a new substance
3. Which of the following is formed through chemical changes?
A. Atom
B. Element
C. Compound
D. Molecule
4. Which of these describes a chemical reaction?
A. Atoms are created by elements.
B. Atoms combine to form elements.
C. Atoms of two or more elements repel each other.
D. Atoms of two or more elements bond to each other
You try first.
the answers are B, C, C, D
I agree with those choices.
me too homie
Thanks,
Hawseefoo is 100% correct
1. To determine which of the following is a compound, we need to understand what a compound is. A compound is a substance composed of two or more elements chemically bonded together in a fixed ratio. So, to identify a compound, we need to check if there are multiple elements bonded together.
Looking at the options:
A. O2: This is a molecule consisting of two oxygen atoms but is not a compound because it consists of only one element (oxygen).
B. NH3: This is ammonia, which consists of one nitrogen atom bonded to three hydrogen atoms. It is a compound because it contains multiple elements (nitrogen and hydrogen) bonded together.
C. H2O+NaCl: This is a mixture, not a compound. It consists of water (H2O) and table salt (NaCl) but does not involve a chemical bond between the two components.
D. N2: Similar to option A, this is a molecule consisting of two nitrogen atoms but is not a compound as it consists of only one element (nitrogen).
Therefore, the correct answer is B. NH3, as it is the only option that represents a compound.
2. To understand the difference between compounds and mixtures, we need to define each term.
A compound is a substance composed of two or more different elements chemically bonded together. The elements in a compound lose their individual properties and combine in a specific ratio to form a new substance with unique properties.
A mixture, on the other hand, is a combination of two or more substances that are physically mixed together but not chemically bonded. In a mixture, the components retain their individual properties.
Now, let's analyze the answer choices:
A. Compounds contain only one element; mixtures contain two or more elements. This statement contradicts the definitions of compounds and mixtures, so it is incorrect.
B. Compounds contain two or more elements; mixtures contain only one element. This statement is also incorrect, as mixtures can contain multiple elements.
C. Compounds contain elements bonded together to form a new substance; mixtures contain elements that are combined but not bonded. This statement accurately describes the difference between compounds and mixtures. Compounds involve chemical bonding, while mixtures do not.
D. Compounds contain elements that are combined but not bonded; mixtures contain elements bonded together to form a new substance. This statement is the opposite of the correct definition, so it is incorrect.
Therefore, the correct answer is C. Compounds contain elements bonded together to form a new substance; mixtures contain elements that are combined but not bonded.
3. To identify which of the following is formed through chemical changes, we should understand the terms provided: atom, element, compound, and molecule.
An atom is the basic unit of matter and cannot be created or destroyed in normal chemical reactions.
An element is a substance composed of only one type of atom and cannot be separated into simpler substances by chemical means.
A compound is a substance composed of two or more different elements chemically bonded together.
A molecule is a group of atoms bonded together, representing the smallest unit of a compound that can take part in a chemical reaction.
Considering the definitions, we can conclude that the formation of a compound involves chemical changes. Therefore, the correct answer is C. Compound.
4. To describe a chemical reaction, we need to understand the concept of atoms and elements.
Atoms are the basic units of matter and are neither created nor destroyed in a chemical reaction. Elements are substances composed of only one type of atom and are represented by chemical symbols on the periodic table.
A chemical reaction occurs when atoms of different elements combine or rearrange to form new substances. There is a breaking and forming of chemical bonds, resulting in the creation of new compounds with different properties.
Analyzing the options:
A. Atoms are created by elements. This statement is incorrect because atoms are not created or destroyed in a chemical reaction.
B. Atoms combine to form elements. This statement is also incorrect because elements are composed of atoms, not the other way around.
C. Atoms of two or more elements repel each other. This statement is incorrect as it describes the behavior of atoms, not a chemical reaction.
D. Atoms of two or more elements bond to each other. This statement accurately describes a chemical reaction since bonding between atoms of different elements is involved in forming new compounds.
Therefore, the correct answer is D. Atoms of two or more elements bond to each other.