3.Write the symbol of the element that has a charge of +1 when it has 71 electrons.
Answers
The symbol :
Further explanation
There are two components that accompany an element, the mass number and atomic number
Atoms are composed of 3 types of basic particles (subatomic particles): protons, electrons, and neutrons
The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.
Atomic number = number of protons = number of electrons ⇒ neutral number
Atomic mass is the sum of protons and neutrons
Atomic Number (Z) = Atomic mass (A) - Number of Neutrons
The element has 71 electrons and a charge of +1 , so
Number of protons = 71 + 1 = 72
Number of protons = the atomic number = 72
The element with atomic number 72 is Hafnium(Hf)
The atomic mass of Hf = 178 g/mol
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A chemist measures 340 grams of sodium acetate. To convert this measurement to kilograms, the chemist should multiply 340 by _.a) 1 kg / 1 gb) 1000 g / 1 kgc) 1000 kg / 1000 gd) 1 kg / 1000 g
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approximate molecular mass of this gas?
A 30 grams
B 40 grams
C 20 grams
D 48 grams
Answers
Answer:
30 grams
Explanation:
I got 40 wrong so I picked 30
Answer:
30 grams
Explanation:
I did the ck12
Answers
Answer: The Sun is present in the center of solar system whose features are color, mass and texture.
Explanation:
Our solar system consists of one star and 8 planets. The star is present in our solar system is the Sun and due to this star only, our solar system is named as such.
The planets present in our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
These planets revolve around the star which is present at the center of the solar system.
Three physical features of Sun are:
- Color: The color of Sun is yellow.
- Mass: The mass of the Sun is
- Texture: Due to the convectional currents, the texture of the whole surface of sun is granular.
Hence, the Sun is present in the center of solar system whose features are color, mass and texture.
Answers
Answer:
+60 kJ
Explanation:
Activation energy = PE(AB) - PE(A+B) = 100 -40 = +60 kJ
(2) covalent, because valence electrons are transferred
(3) ionic, because valence electrons are shared
(4) ionic, because valence electrons are transferred
Answers
B. nitrogen
C. ammonia
D. carbon dioxide
Answers
Carbon dioxide. This is because when fossil fuels are burned, oxygen combines with carbon to form CO2 and with hydrogen to form water (H2O). These reactions release heat that we use for energy. For example, for the same amount of energy produced, burning natural gas produces about half of the amount of CO2 produced by burning coal.
Final answer:
The burning of fossil fuels primarily releases carbon dioxide into the atmosphere, contributing to greenhouse gas emissions and global warming.
Explanation:
When fossil fuels are burned, carbon dioxide (CO₂) is predominantly released into the atmosphere. Fossil fuels, such as coal, oil, and natural gas, are composed mainly of carbon. During combustion, this carbon combines with oxygen in the air to form carbon dioxide. This process is a significant source of greenhouse gases, contributing heavily to global warming. It's important to note that other substances like water vapor and minor amounts of sulfur oxides can also be produced in this reaction, but the main product is carbon dioxide.
Learn more about Burning of Fossil Fuels here:
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Answers
Since height is a basic physical property of length, the height of a classroom ceiling is expressed in meters, or meters, or meters.
What is physical property of length?
There are some physical characteristics of matter, such as length, mass, volume, weight, and so forth, that are dependent on the amount or size of the substance.
As the size or amount of the matter changes, so do these qualities of matter and their values.
A quality of matter that is unrelated to a change in its chemical makeup is called a physical property.
Density, color, hardness, melting and boiling points, and electrical conductivity are a few common examples of physical qualities.
The physical characteristics include color, phase, odor, and boiling point. Reactivity with oxygen is not a physical quality because it depends on the chemical makeup of the thing.
Therefore, meter is used to express the height of your classroom ceiling.
Learn more about length here:
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Hope that helps!