Chemical Formulae
A compound has the formula Ca₃(PO₄)₂.
What is the name of this compound?
Calcium phosphate
When magnesium reacts with hydrochloric acid, a salt and a gas are produced. Name the gas which is produced.(If you can't find it you will get -250 points)
Hydrogen gas
What is a displacement reaction? Give general word equation or an example
This reaction involves a more reactive metal replacing a less reactive metal from its compound.
General word equation: A + BC → AC + B
Example: Zinc + Copper sulfate → Zinc sulfate + Copper
What are the factors that can make a chemical reaction happen faster? (2 are ecceptiaonal but if you know all 3 you'll earn extra 50 points)
Temperature
Concentration
Surface Area
Explanation:
Temperature: When temperature increases, particles move faster, so they collide more often and with more energy.
Concentration: A higher concentration means more particles in the same space, increasing the chance of collisions.
Surface Area: Smaller pieces or powders expose more surface for reactions, so collisions happen more easily and quickly.
+100, -50
🤭🤔😥
I’m a gas that you can’t see,
From swamps and cows, I float out free.
One carbon and four Hs in my chain,
My name ends with “-ane” — I’m not plane!
What am I, and what’s my formula too?
This science riddle is just for you!
Name: Methane Chemical Formula: CH₄
What are the two products formed when an acid reacts with an alkali?
Water and a salt
Mia investigate displacement reactions. In her first experiment she:
* puts some iron sulfate solution into a test-tube
* adds a piece of zinc to the iron sulfate solution
* records if a displacement reaction takes place.
Mia repeats the experiment, but thi time uses different metals.
Look at table showing Mia's results from the first experiment.
Metal | Is there a displacement reaction? Magnesium |
Copper |
(If you can't find it, you will lose 400 points. If other groups steal but can’t find it, they will lose 350 points. )
Metal | Is there a displacement reaction?
Magnesium | yes
Copper | no
What is the Law of Conservation of Mass in chemical reactions? Explain its meaning. (Full, if no -400)
the total mass of the reactants equals the total mass of the products in a closed system.
Explanation:
In a chemical reaction, atoms rearrange but are not created or destroyed. Since mass measures matter, the total mass stays the same before and after the reaction. This helps chemists balance equations and shows that matter is conserved.
+1000
-3500
Oh, congrats you are a loser😁
A compound called ammonium sulfate is made from two ammonium ions (NH₄⁺) and one sulfate ion (SO₄²⁻).
Using the correct ratio of ions to balance the charges, write the chemical formula of ammonium sulfate.
(NH₄)₂SO₄
A student adds calcium carbonate to hydrochloric acid. What three products are formed?
ter,Calcium chloride, wa and carbon dioxide
Predict what happens when magnesium is placed in iron(II) sulfate solution. Write the word equation.
Magnesium is more reactive than iron, so it will displace iron from iron(II) sulfate solution.
Word equation:
Magnesium + Iron(II) sulfate → Magnesium sulfate + Iron
Dilute hydrochloric acid reacts with calcium carbonate. Blessy plans an investigation to find out the effect of concentration of acid on the rate of this reaction.Describe how Blessy measures the dependent variable in this investigation.
Dependent variable ........................
How it measured ..................................................
Dependent variable:
The rate of reaction
How it is measured:
By measuring how much carbon dioxide gas is produced in a certain time.
If the team that chose this consists of 2 members, they get +300 points. However, if your team includes 3 members, you will receive -100 points. Teams with 2 members earn +100 points.
CONGRATS WITH YOU POINTS...!
A compound called aluminum nitrate is made from aluminum ions (Al³⁺) and nitrate ions (NO₃⁻).
Write the chemical formula of aluminum nitrate.
How many total oxygen atoms are there in one formula unit of this compound?
Formula: Al(NO₃)₃
9 oxygen atoms
Ahmed makes some copper sulfate crystals. He adds an excess of copper sulfate solution and the excess copper oxide. Copper oxide is insoluble in water. Describe how Ahmed makes copper sulfate crystals from the contents of the beaker.(If you can find the correct answer, you will get an extra +150 points.)
First, Ahmed needs to boil it so the liquid will evaporate. But there should still be a small amount of liquid left. Then, he puts it somewhere and waits for a few days. After a few days, crystals will form.
The most common ore of lead is lead sulfide.
To extract the lead, the ore is first heated in air to produce lead oxide.
The lead oxide is then heated with carbon to extract the lead. Copper is less reactive than lead. Predict whether carbon can be used to extract copper from copper oxide.
Yes, carbon can be used to extract copper from copper oxide because carbon is more reactive than copper. Carbon can displace copper from its oxide in a similar way it displaces lead.
During an experiment, you increase the temperature of a reaction mixture and notice the reaction speeds up.
Explain in detail why increasing temperature increases the rate of a chemical reaction, including what happens to the particles involved.
Increasing the temperature makes the particles move faster, so they collide more often and with greater energy. More collisions with enough energy mean more successful reactions happen in a given time, which speeds up the reaction.
If the English alphabet goes from A to Z, what goes from Z to A?(If you can find the correct answer you will get extra +100, but if you can't -1000)
Zebra
What are the products of the reaction:
Hydrochloric acid + Copper(||) carbonate --> ???
Copper chloride + Water + Carbon dioxide
Complete the following word equation related to the formation of salts:
Hydrochloric acid + Copper(II) carbonate ->......
Hydrochloric acid + Copper(II) carbonate -> Copper(II) chloride + water + carbon dioxide
A metal displaces the iron from a solution of iron sulfate and the copper from a solution of copper sulfate. This metal does not displace the magnesium from a solution of magnesium sulfate.
a) What does this tell you about the reactivity of the unknown metal?
b) This unknown metal could be one of two metals. Which two?
a) The unknown metal is more reactive than iron and copper but less reactive than magnesium.
b) Zinc or aluminum.
Catalyst is a substance, which __________ chemical reaction. Fill in the gaps
Increases the speed of a chemical reaction
What will you do if you fail the math Testing? *If your're wrong -1010*
You'll solve IDC and work as a cleaner until the next exam