CHEMISTRY HIGH SCHOOL

Which of the following is not true of alloys?a. Alloys are made of two or more metals combined physically.
b. The mixture of metals in an alloy is based upon the desired use.
c. Alloys can be substitutional or interstitial.
d. An example of an alloy is copper.

Answers

Answer 1
Answer: Option d: copper.

Because copper is an element, not a mixture.

Related Questions

Q. 8 Normally, the pH of the human body is fixed in a very narrow range between 7.35 and 7.45. Apatient with an acidotic blood pH of 7.3 may be treated with an alkali such as sodium bicarbonate. Why would this treatment raise the pH of the blood? Can you please explain it?
The two classifications of all chemicals are organic and salts. a. True b. False
An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result?The first atom emits light with more energy. The second atom emits light with more energy. The first and second atoms absorb energy without emitting light. The first and second atoms emit light with the same amount of energy.
Based on the law of Conservation of Mass, what happens to the mass of a substance in a chemical change? A: the mass is always conserved B: The mass is either created or destroyed C: the reactant always has more mass D: the product always has more mass
What happens in a reduction half-reaction?elements gain electronselements lose electronsoxygen is addedoxygen is lost

True or false: Denaturation of an enzyme increases the rate at which it may catalyze a chemical reaction.

Answers

The answer is False. Hope this helps.

The breaking and making of chemical bonds can explain chemical reactions and energy flow. a. True b. False

Answers

The breaking and making of chemical bonds can explain chemical reactions and energy flow. a. True b. False

True

Which statement correctly describes diamond and graphite, which are different forms of solid carbon?(1) They differ in their molecular structure, only.
(2) They differ in their properties, only.
(3) They differ in their molecular structure and properties.
(4) They do not differ in their molecular structure or properties.

Answers

Answer: Option (3) is the correct answer.

Explanation:

When an element exists in two or more different physical forms then they are known as allotropes.

For example, diamond and graphite are both allotropes of carbon.

In graphite, carbon atoms are joined together in sheets of six sided lattice. Whereas in diamond, carbon atoms are joined together in four cornered lattice.

Therefore, as these allotropes are made up of same element so they have similar chemical properties but different physical properties like melting point, boiling point etc.

Also, both of them have different molecular structure.

Thus, we can conclude that the statement the differ in their molecular structure and properties correctly describes diamond and graphite.
They differ in their molecular structures and properties.

Describe the motion of a ball being thrown straight up in the air in terms of kinetic and potential energy. as the ball rises up and falls back down, how is its kinectic and potential energy affected?

Answers

In your hand, the ball has higher potential energy than kinetic because it is still off of the ground but it isn't moving so there is no kinetic. As the ball rises, its potential and kinetic energy increases. At its peak, it has very high potential energy and very low kinetic energy. As it falls, the potential energy decreases but kinetic does not.

Carbon forms molecular compounds with some elements from Group 16. Two of these compounds are carbon dioxide, CO2, and carbon disulfide, CS2.Carbon dioxide is a colorless, odorless gas at room temperature. At standard temperature and pressure, CO2(s) changes directly to CO2(g).

Carbon disulfide is formed by a direct reaction of carbon and sulfur. At room temperature, CS2 is a colorless liquid with an offensive odor. Carbon disulfide vapors are flammable.

59 Identify one physical property and one chemical property of CS2. [1]

Answers

Answer: Physical property of CS_2 is state of matter (liquid) and it is a chemical compound.

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Carbon disulfide(CS_2) is the compound which is formed by the chemical combination of carbon and sulfur atoms. The equation for this follows:

C+2S\rightarrow CS_2

The chemical property of carbon disulfide is different from that of carbon and sulfur. Thus, this is a chemical compound.

It is given, that this compound is a colorless liquid, which means that the state of this compound is liquid state.

Hence, physical property of CS_2 is state of matter (liquid) and it is a chemical compound.

The physical property of carbon disulfide is that at room temperature, CS2 is a colorless liquid with an offensive odor. The chemical property of carbon disulfide is that it is formed by a direct reaction of carbon and sulfur.

In which compound is the percent by mass of oxygen greatest?A. BeO
B. MgO
C. CaO
D. SrO

Answers

Answer: BeO

Explanation:

percent by mass of oxygen=\frac{\text {mass of oxygen}}{\text {Total mass of substance}}* 100\%

percent by mass of oxygen in BeO=(16g)/(25.01g/mol)* 100=63.97\%

percent by mass of oxygen in MgO=(16g)/(40.30g/mol)* 100=39.70\%

percent by mass of oxygen in CaO=(16g)/(56.08g/mol)* 100=28.53\%

percent by mass of oxygen in SrO=(16g)/(103.62g/mol)* 100=15.44\%
The answer is A
Hide the Oxygen for a minute
Mass of elements:
Be:9.012
Mg:24.305
Ca:40.078
Sr:87.62
Out of all these choices, Be is the lightest
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