CHEMISTRY HIGH SCHOOL

What is true about the metals in group 1A, 2A, 3A?a)all form ions with negative charges
b)all have ions with a 1+ charge
c)gain electrons when they form ions
d)lose electrons when they form ions

Answers

Answer 1
Answer: D, becuase they have toatal no of valence electron as their group nmber and we know the metals are those who have 1,2,3 electrons in their outermost

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How many grams of H2 would be formed if 34 grams of carbon reacted with an unlimited amount of H2O? The reaction is:C + H2O CO + H2 1) Is this equation balanced? 2) What is the starting substance? 3) What is the ending substance that is asked for in the problem? Additional info: The atomic mass of C is 12.01 g/mole. The atomic mass of H2 is 2.016 g/mole.
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A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from(1) 400. K to 200. K (3) 400.°C to 200.°C
(2) 200. K to 400. K (4) 200.°C to 400.°C

Answers

When the pressure is constant, the temperature and volume of the gas has ratio relationship: V1/T1= V2/T2. And the temperature using unit of K. Then we can get the answer is (2) 200 K to 400 K.

Fill in the Blank. 1. You want to be shielded from all three types of nuclear radiation. If you find shielding that blocks _________________ radiation, then it will most likely also block the other two types. 2. When nuclear radiation enters the tube of a Geiger counter, it ____________________ the atoms of the gas contained in the tube. 3. The particles that make up protons and neutrons and are thought to be basic units of matter are ____________________.

Answers

1.  If you find shielding that blocks gamma radiation,then it will most likely also block the other two types. (as the hardest radiation)
2. When nuclear radiation enters the tube of a Geiger counter, it the excited atoms of the gas contained in the tube. (this type deposits all energy into a single atom)
3 The particles that make up protons and neutrons and are thought to be basic units of matter are quarks.

Why is crushed ice used for snow cones? a) decreasing the pressure helps dissolve more flavoring
b) increasing the temperature helps dissolve more flavoring
c) increasing the surface area helps dissolve more flavoring
d) decreasing agitation helps dissolve more flavoring

Answers

The reason for crushing ice for snow cones is C) increasing the surface area helps dissolve more flavoring. The amount of flavoring absorbed depends on the temperature and the surface area of contact. Because the temperature can not be increased without melting the ice, the ice is crushed. This increases its surface area and more flavoring is dissolved.
The answer to the question is C, increasing the surface area helps dissolve more flavoring. The motivation behind why squashed ice utilized for snow cones is a direct result of expanding the surface range breaks down all the more enhancing. The snow cone is a cone-molded paper glass that contains little bits of ice enhanced with a sweet syrup.

What part of the atom is responsible for the behavior of the alpha particles?

Answers

Answer:

nucleus

Alpha particles are subatomic fragments consisting of two neutrons and two protons. Alpha radiation occurs when the nucleus of an atom becomes unstable (the ratio of neutrons to protons is too low) and alpha particles are emitted to restore balance.

Explanation:

Select all that apply to the property of hardness.Hardness is a physical property
Hardness is indicative of the strength of chemical bonds between elements.
Hardness is determined through a complicated process that requires expensive instruments.
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.

Answers

The correct statements are:

Hardness is a physical property
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.

Answer:The properties of the Hardness are:

  • Hardness is a physical property
  • Hardness is indicative of the strength of chemical bonds between elements.
  • Diamond can scratch quartzExplanation:

Hardness is defined as resistance offered by a material when subjected to any kind of mechanical effort.It is a physical property

Hardness of a materiel indicates its strength that strength of its chemical bond between the atoms and their arrangement in space.

Mohs scale is a scale which measures the hardness of the materiel from 1 to 10. Materiel with higher Mohs scale number will able to scratch materiel with lower Mohs scale score.

The properties of the Hardness are:

Hardness is a physical property

Hardness is indicative of the strength of chemical bonds between elements.

Diamond can scratch quartz.

What is the difference between periods and groups on the periodic table?

Answers

Periods are rows horizontally along the periodic table whereas groups are vertical columns down the periodic table.
Elements in the same group react similarly. E.g. the group 1 metals (found in the first column of the periodic table) react readily with air and water (this is the similarity) but these reactions become more vigorous / explosive as you go down the group (this is why they are similar but not the same). This is because elements in the same group have the same number of electrons in their outermost energy level (and electrons are responsible for how an element reacts)
Elements in the same period of the periodic table have the same number of inner most (also known as 'main') energy levels so have the same amount of electron shielding.
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