CHEMISTRY HIGH SCHOOL

Based on its location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?A. magnesium (Mg)
B. barium (Ba)
C. cesium (Cs)
D.rubidium (Rb)

Answers

Answer 1
Answer: Based on its location on the periodic table, the metal that is likely to be less reactive than both strontium and sodium is magnesium (Mg). The answer is letter A. The rest of the answers are highly reactive.
Answer 2
Answer:

Answer: Option (A) is the correct answer.

Explanation:

When we move downwards in a group then size of the atom increases due to which there is less force of attraction between the nucleus and valence electrons of the atom.

Hence, the atom can easily loose electrons. As a result, reactivity of elements increases down the group.

But when we move across a period then there is decrease in reactivity of the atoms as size of atoms decreases due to which there is an increase in force of attraction between the nucleus and valence electrons.

Therefore, atoms are unable to lose electrons easily.

Hence, magnesium is less reactive than both sodium and strontium. Whereas except magnesium rest all options are more reactive than sodium and strontium.

Thus, we can conclude that magnesium is likely to be less reactive than both strontium and sodium.

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Which refers to a mixture that contains more than one phase in which the characteristics of the particles vary throughout the mixture?

Answers

This type of mixture is a heterogeneous mixture. It is any mixture that is not uniform. Heterogeneous mixtures always have more than one phase.It is made up of substances which stays physically separate with each other. Best example is a mixture of sand and sugar. If you get two samples from different points of the mixture and analyze it, you will see that the concentrations of the components are different and that the two solid phases never combine with each other.

Answer:

C. Heterogeneous

Explanation:

Which step would help a student find the molecular formula of a compound from the empirical formula?Multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.

Subtract the ratio of the actual mass of the compound to the empirical formula mass from the subscripts of the empirical formula.

Divide the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.

Add the ratio of the actual mass of the compound to the empirical formula mass to the subscripts of the empirical formula.

Answers

Answer : Option A) Multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.

Explanation : To find molecular formula for a compound one needs to follow the below steps using the emphirical formula of that compound.

Step 1) Calculate the empirical formula mass of that compound

Step 2) Take the ratio of gram molecular mass by the empirical formula mass that was obtained in step 1.

Step 3) Multiply each of the subscripts within the empirical formula by the number that is calculated in step 2.

By following these easy steps one can find the molecular formula.

The step that would help a student finds the molecular formula of a compound from the empirical formula is by ‘Multiply the ratio of the actual mass of the compound to the empirical formula mass by the subscripts of the empirical formula.’

Which barium salts is most insoluble in water?

Answers

Barium salts are mostly insoluble and toxic.

Example : Barium chloride , barium hydroxide, barium carbonate,barium sulfate.

hope this helps!
          

How should the baking of a pizza be categorized

Answers

The baking of a Pizza be Categorize as Endothermic Process

The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy.

It can be a biochemical process like solving the salt in water or just the melting of ice. Therefore, the dough absorbs heat and it is categorized as an endothermic process.

Answer:

The correct answer is endothermic process.

Explanation:

An endothermic process is one in which the system absorbs heat from the environment. In the pizza baking process, the dough absorbs the heat from the oven. The flow of heat goes from the oven to the pizza. In this case, it is about thermal energy, if the temperature of a body increases, the thermal energy of the body also does it.

Have a nice day!

An atom of any element must contain(1) an equal number of protons and neutrons
(2) an equal number of protons and electrons
(3) more electrons than neutrons
(4) more electrons than protons

Answers

An atom of any element must contain "(2) an equal number of protons and electrons" but it should be noted that atoms can borrow electrons from one another. 
An atom (which by definition is neutral) should have (2) an equal number of protons and electrons.
If the number of protons and electrons are not equal, it becomes an ion.The number of protons and neutrons can vary widely depending on what the substance is and depending on the isotopes.

How many moles are in 1.9 x 10^25 molecules of carbon dioxide

Answers

1 mole ----------- 6.02x10²³ molecules
? moles --------- 1.9x10²⁵ molecules

moles = 1.9 x 10²⁵ * 1 / 6.02x10²³

= 1.9 x 10²⁵ / 6.02x10²³

= 31.561 moles

hope this helps!
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