11 combined review chemistry | Baamboozle - Baamboozle

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Explain why the pH of a hydrochloric acid increases when pure water is added

the pH increases as the water dilutes the acid. This is because hydrogen ions are less concentrated

the horizontal lines on the periodic table are called

periods

Which of the following is NOT a diatomic molecule? hydrogen, bromine, phophorous, nitrogen or

phosphorous

what is the word equation for the following

sodium hydroxide + hydrochloric acid sodium chloride and water

Which two elements on the periodic table are liquids at room temperature?

bromine and mercury

Place the following pH values in order of increasing acidity: 4,1,7, 12, 6

12<7<6<4<1

Throughout the experiment the volume of hydrogen and the volume of oxygen are measured at two-minute intervals. Describe what the results show about the volumes of hydrogen and of oxygen produced in this experiment.

A description to include • volumes going up: (oxygen/ hydrogen/ gas) increase (with time) / volume (directly) proportional to time (1) • quantitative comparing

Explain why relative atomic masses of some elements are whole numbers, but those of some other elements, for example chlorine, are not.

Some elements have different isotopes, so their relative atomic masses are a weighted mean value.

Give an example of an alkali metal

Either: lithium, sodium, potassium, rubidium, cesium or francium (Li, Na, K, Rb, Cs, Fr)

Name of this structure?

methylbutane

Is chlorine an alkali metal, alkaline Earth metal, halogen or noble gas?

halogen

An atom of element X has an atomic number of 119 and a mass number of 319. How many protons does it have?

119

In fractional distillation, which would come out first? (ethane, pentane or decane)

ethane

Calculate the relative formula mass of calcium carbonate, CaCO3. (relative atomic masses: C = 12, O = 16, Ca = 40)

100 (amu or g/mol)

For an atom of atomic number 137, how many electrons does it contain?

137

) 8.000 g of CaCO3 was heated strongly for about 10 minutes. 6.213 g of solid remained. Calculate the mass of carbon dioxide gas given off.

8.000- 6.213 = (1.787) (g)

Calculate the relative formula mass of calcium carbonate, CaCO3. (relative atomic masses: C = 12, O = 16, Ca = 40)

100

Why is iron used in the Haber process?

it acts as a catayst

The periodic table organizes elements in groups based on what?

reactivity or valence electrons

Definition of catalyst: a substance that speeds up a reaction without altering the ________(a) and is unchanged _______(b)

(a) products (b) chemically

What is an advantage of having internationally agreed hazard symbols?

the hazards associated with the use of a substance will be understood in any country

What is a chemical test for hydrogen gas?

squeaky pop test

What is the name of this compound?

sodium dihydrogen phosphate monohydrate

Generally, what is the ionic charge on group 6 ions?

-2

What does the symbol Na stand for?

sodium

Which subatomic particle has the lowest mass?

electron

An atom of element X has an atomic number of 119 and a mass number of 319. How many electrons does it have?

119

What is the electron configuration of nitrogen (atomic #7)

2.5

Write the formula for magnesium phosphide

Mg3P2

Some metal objects are electroplated. State two reasons for electroplating a metal object.

Any two • improves the appearance/ shiny (1) • improves resistance to corrosion/ does not corrode/ prevents reaction with prevents oxi; Any two from: • improve

How many electrons are there in a chloride ion (Cl-)?

18

An atom of element X has an atomic number of 119 and a mass number of 319. How many neutrons does it have?

200

Rauda wants to separate 2 liquids. Liquid A has a boiling point of 65C and liquid B has a boiling poit of 95C. She sets up a fractional distillation. Which liquid is collected first?

Liquid A, because it has the lower boiling point, it comes out first.