CHEMISTRY HIGH SCHOOL

Which of the following substances would be the softest?CuO

SiC

C25H52

Zn

Answers

Answer 1
Answer:

Answer:

The paraffin is the softest.  

Explanation:

The others materials, they have a bigger value of hardness in Mohs scale, like the CuO with a value of 3.5, the SiC with a value of 9, and Zinc with a value of 2.5.

Answer 2
Answer: I think the correct answer is the last option. Zinc is the softest substance among the choices given. Pure zinc is a soft metal. It is when alloyed it will became hard. Its hardness as a pure metal is only 2.5 using the Mohs scale.

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Which ion is the only negative ion present in an aqueous solution of an Arrhenius base?(1) hydride ion (3) hydronium ion
(2) hydrogen ion (4) hydroxide ion

Answers

The correct answer is option 4. It is the hydroxide ions that is produced by an Arrhenius base in water. According to Arrhenius, acid-base reactions are characterized by acids which forms hydronium ions in water and bases which dissociates in aqueous solution to form hydroxide ions. 

What is heat?
(in scientific vocab)

Answers

my guess i dont know exactly but heat is energy

heat absorbed or radiated during a change of phase at a constant temperature and pressure. specific heat. the heat required to raise the temperature of one gram of a substance one degree centigrade. heat of condensation. heat liberated by a unit mass of gas at its boiling point as it condenses into a liquid.

Which of the following is the SI unit used to measure mass?

Answers

The SI unit used to measure mass is said to be option A: kilogram (kg).

What is  the SI unit used to measure mass?

The kilogram (kg) is the standard unit used to measure mass. The kilogram is the main unit used to measure how heavy something is in the International System of Units. It is based on the weight of a special cylinder made of platinum and iridium called the International Prototype of the Kilogram.

The liter (b.) is the SI unit for volume, the meter (c.) is the SI unit for length, and the Kelvin (d.) is the SI unit for temperature.   The kilogram is commonly used as a standard unit for measuring weight in science, industry, and everyday situations.

Hence option A is correct.

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see full text below

Which of the following is the SI unit used to measure mass? a.

kilogram

b.

liter

c.

meter

d.

Kelvin
An SI unit is a unit that's used to measure something and is used by everyone around the world. 

the SI unit for mass is the kilogram (kg)

The Top Thrill Dragster, a rollercoaster at Cedar Point in Ohio, soars through the air at 176ft/sec. How fast is this in mph?​

Answers

The rollercoaster has a speed of 176 ft/sec. This can be converted to miles per hour. The speed is equivalent to 120 mph.

What is speed ?

Speed is a physical quantity measuring the distance travelled by an object per unit time. Speed is a scalar quantity. The rate of speed is called velocity.

The speed can be expressed in different units. such as m/s, km/h, ft./s miles per hour etc. These units can be interconverted using specific relations.

One ft/s = 0.682 mph

then, 176 ft./s  = 0.682 × 176 = 120 mph.

Therefore, the speed of the roller coaster is 120 mph.

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Explain why all ores are minerals but all minerals are not ores.

Answers

An ore is a type of rock that contains many minerals. But a mineral is just a part of the ore. So all ores are minerals but all minerals are not ores.
Minerals:Metal bearing substance, found in earth's crust are called minerals
Ore:the Minerals which metals can be obtained on a commercial scale are called Ores
   form this definitions we can understand that ores are minerals which is used to obtain metals so, only all ores are minerals but all minerals are not ores.

What is the number of proton in chlorine?

Answers

Answer:

Atomic Number of Chlorine. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure.

Explanation:
The number of protons in chlorine is 17.
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