Purple spheres represent iodine atoms, white spheres represent hydrogen atoms, and all of the molecules are gases. (Figure 1)

Q: Which one of the following is an example of an element? A) brass B) nickel C) bronze D) sterling…

A: An element is a pure substance that cannot be broken down into simpler substances by means of any…

Q: A new element named catsium is added to the periodic chart. One of the numbers written below the…

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Q: Using white and black circles to represent different kinds of atoms, make a drawing that accurately…

A: Given samples of matter,         A solid element, a liquid compound, and a heterogeneous mixture.

Q: What is the chemical symbol of the element found in the 4th family and 5th period of the periodic…

A: Carbon family is called 4th family and there elements are C , Si , Ge , Sn , Pb , Fl

Q: X Select the 4 properties of metals * Hard Conducts electricity Smells bad Does NOT conduct heat…

A: Metals are those substances which usually lose there valence electrons to form compounds.

Q: Figure 3. Diatomic molecules of the element chlorine, Cl2. This Figure 4. Molecules of the compound…

A: ⇒All atoms are made up of tiny particles ie,protons,neutrons and electrons⇒A n element is a pure…

Q: Classify the substance shown in the sketch below. You can click the other tabs in the sketch to get…

A: Given: The sketch provided shows a substance.  Looking at 1000X, it seems to be hard and a pattern…

Q: Density of the hydrogen atom Use the information below to calculate the density of the hydrogen-1…

A: Given : Radius of hydrogen atom = 53 pm Since 1 pm = 10-10 cm Hence radius of hydrogen atom in cm =…

Q: place the symbols in set 1 and set 2 in the correct place (don't answer questions)

A: The periodic table of the elements is an ordered arrangement of the chemical elements into rows and…

Q: An atom of a particular element has a volume of 7.8*10^-31 m^3. What is this volume in cubic…

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Q: I Review I Constants I Periodic Table Learning Goal: To understand the arrangement of the periodic…

A: Metals are malleable and ductile. They  are denser than the other elemental substances. An element…

Q: Write the following from largest to smallest size. C (a) Ca, Mg2+, Ca2+

A: (a) Comparing the size of a cation and neutral atom, cation will have smaller size.   Therefore, the…

Q: John Dalton developed an atomic theory from which our current theory was built off. Which of the…

A: Dalton atomic theory is on the basis of law of conservation of mass , i.e mass can neither be…

Q: Chemistry focuses on representing the submicroscopic world of atoms. A billion atoms of gold-197…

A: 1 Billion atoms of Gold weigh  = 3.3 × 10-¹³ g

Q: Magnesium, Mg Strontium, Sr Barium, Ba E Radium, Ra :::: :::

A: We know that on going left to right atomic radii decrease and on going from top to bottom atomic…

Q: An imaginary element (x) on Mars is composed of two isotopes, 54.93% of isotope x-34 with a mass of…

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Q: +, - nich of the following correctly indicates whether the solid represented by the particulate…

A: Need to examine both positive and negatively charged ions in the given model

Q: LKuipor Bek asderolch Jupiter Mércúry Venus * Uranus Saturn Mars Earth Ceres Neptune Jupiter Pluto…

A: Dwarf planet : Dwarf planet is a celestial body orbiting a star that is massive enough to be rounded…

Q: What is the chemical symbol of the element found in the 4th family and 5th period of the periodic…

A: Fourth family is called carbon family. The element present in fifth period of fourth family is Tin.…

Q: Complete and balance the following equations. Click in the answer box to open the symbol palette. 1…

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Q: is chlorine gas an element ?

A: The simplest chemical substance which made up of atoms with the same number of protons and it cannot…

Q: Write the following from largest to smallest size. (Use the appropriate <, =, or > symbol to…

A: Comparing the size of a cation and neutral atom, cation will have smaller size. Since Mg is below Be…

Q: The radius (r) of a silver atom is 160 picometers (1 pm = 1 × 10–12 m). Estimate the thickness of…

A: First convert the unit of radius from picometers to centimeters; 1 pm=10-10cm160 pm=160×10-10cm

Q: Which of the following could describe an element?   I II III All of them None of them

A: Matter: Matter can be defined as any component which occupies space and has mass.

Q: Helium is an inert gas, meaning that it doesn't readily combine with other elements. What five other…

A: Given, Helium is an inert gas, meaning that it doesn't readily combine with other elements.

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A: Solving for Integer Value of m 37 −150/m = −13

Q: Antinomy, Sb, has 2 isotopes and an atomic weight of 121.75 amu. The isotope anitimony-121 has a…

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Q: 2. An unused flashbulb contains magnesium and oxygen. After use, the contents are changed to…

A: Given that,  A flashbulb contains magnesium (Mg) and oxygen (O2) , they react and forms magnesium…

Q: Name the element which has 26 electrons, 29 electrons, 26 protons

A: General way of element presentation:. AxZ where z is no. Of protons A is no. Of neutrons+protons

Q: 2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it…

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Q: Liquid A has 10 grams of element X per liter. Liquid B has 15 milligrams of element Y per cm3 (there…

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Q: As you know, one way to classify matter is by its material. Metals, nonmetals, and metalloids are…

A: The periodic table's leftmost elements have the strongest metallic characteristics, and when we move…

Q: In a reaction, 28.6 g of chromium(III) oxide reacts with 10.2 g of aluminum to produce chromium and…

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States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.