CHEMISTRY COLLEGE

Which are correct ???

Answers

Answer 1

Answer:

Answer:

last one

Explanation:

endothermic reactions release energy

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The _______ are found on the left side of the arrow in a chemical reaction. A. coefficients B. reactants C. products D. subscripts

Answers

B reactants then C is on the right side! If you take h2O and air (the reactants) then the product would be a snowflake. happy holidays!!

Answer:

Reactants

Explanation:

What type of matter do alloys fall under?a) Element
b) Compound
c) Heterogeneous mixture
d) Homogeneous mixture

Answers

An alloy, a metallic substance composed of two or more elements, as either a compound or a solution is a homogeneous mixture. The correct option is d.

What is an alloy?

An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of metal in the resulting material, such as electrical conductivity, ductility, opacity, and lustre, but may have properties that differ from those of pure metals, such as increased strength or hardness.

In some cases, an alloy may reduce the overall cost of the material while preserving important properties. In other cases, the mixture imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Alloys are defined by a metallic bonding character. The alloy constituents are usually measured by mass percentage for practical applications, and in atomic fraction for basic science studies.

Alloys are usually classified as substitutional or interstitial alloys, depending on the atomic arrangement that forms the alloy.

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Answer:

An alloy is a homogeneous mixture

Explanation:

g The electronic structure of which ONE of the following species cannot be adequately described by a single Lewis formula? (In other words, the electronic structure of which one can only be described by drawing two or more resonance structures?) A) C2H4 B) SO3 2– C) SO3 D) C3H8 E) HCN

Answers

Answer:

C) SO3

Explanation:

Lewis formula shows the bonding between atoms of a molecule and expresses the lone pair present in the atoms.

SO3 or Sulfur trioxide cannot be adequately described by a single Lewis formula because it has majorly 3 resonance structures because Sulfur does not follow the octet rule and can expand electrons in its outer shell.

Hence, the correct answer is C) SO3

Final answer:

SO3, or Sulfur Trioxide, is the molecule whose electronic structure requires the depiction of multiple resonance structures for adequate description. The rest of the species can be represented with a single Lewis structure.

Explanation:

The electronic structure that can only be described by drawing two or more resonance structures is SO3 (Sulfur Trioxide). This molecule has 24 valence electrons having a central atom with expanded octet. The Lewis structure is drawn in a way that three resonance structures are needed to represent the bonding in this molecule adequately. On the other hand, the rest of the species given in the options can be described using a single Lewis formula.

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G write the symbols for the cation and anion that make up each ionic compound Co(NO3)2

Answers

Answer:

$Co(NO_3)_2$ is formed of cation, $Co^(2+)$ and anion, $NO_3^(-)$

Explanation:

Naming of the ionic compounds:-

The name of the cation is written first and the the name of the anion is written after the name of the cation separated by single space.
The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
In case of transition metals, the oxidation state are written in roman numerals in bracket in front of positive ions.

Hence, given ionic compound:-

$Co(NO_3)_2$ is formed of cation, $Co^(2+)$ and anion, $NO_3^(-)$

Thus, the name must be Cobalt(II) nitrate.

A protein is Select one: a. a saturated ester of glycerol. b. a polysaccharide. c. an aromatic hydrocarbon. d. a polymer of amino acids. e. one of the units making up a nucleic acid.

Answers

Answer:

d. a polymer of amino acids

Explanation:

Got it right on the test.

Answer:

Explanation:

The building blocks or monomers of proteins are called amino acids. There are 20 different kinds of amino acids. The amino acids form long chains that are proteins. Therefore, proteins are polymers of amino acids.

Proteins are very important for the body because they have many different roles. They provide structure for tissues, act as enzymes, hormones and antibodies, aid in transportation and fluid regulation.

Therefore, the correct answer is D. a polymer of amino acids.

Fruits and vegetables exposed to air begin to brown because of a chemical reaction in their cells. This may result in these foods being thrown out. Some people have found that adding lemon juice (citric acid) to apple slices keeps them from turning brown. The prevention of browning is likely the result of *increasing the concentration of enzymes
increase in the temperature
slowing the rate of enzyme reaction
maintaining the pH

Answers

The prevention of fruits browning is the result of :

>slowing the rate of enzyme reaction

How is the browning of fruits prevented?

The browning of fruits can be slowed down by preventing the enzyme from working properly. Lemon juice contains an acid which can stop enzymes from working properly. For example, water and sugar in jam prevents oxygen in the air to reach enzymes and hence protects from browning.

Always keep cut fruits such as apples, pears and peaches from turning brown by coating them with an acidic juice such as lemon or orange.

The enzyme that is responsible for the browning is called polyphenol oxidase. PPO enzyme in the presence of oxygen changes substances known as phenolic compounds, through oxidation, into quinones.

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Answer:

slowing the rate of enzyme action

Explanation:

Other Questions

A mixture of neon and xenon gases, at a total pressure of 739 mm Hg, contains 0.919 grams of neon and 19.1 grams of xenon. What is the partial pressure of each gas in the mixture?_______g Xe

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Calculate the electric double layer thickness of a alumina colloid in a dilute (0.1 mol/dm3) CsCI electrolyte solution at 30 °C. How are these numbers affected by the addition of 0.1 mol/dm3 of KCL? At what distance from the particle surface (r) has the potential decayed to 1% of its initial value?

PLEASE HELP ME I WILL MARK AS BRAINLIEST ANSWER-100 points When we look at a plant, we notice that the leaves are green. Thisis due to the (4). in the leave that allows the plant to absorbsunlight. Plants use the light energy in a reaction called (5).where they make food in the form of sugar and produce oxygen.(6)___ which are only found in plant cells, is where the foodmaking reaction takes place. In this reaction: water, carbon dioxide,and energy from the sun are needed for the reaction and are called(7) The things that are formed in the reaction, or the(8). are sugar and oxygen.