CET: Chemistry

Hydrocarbons are compounds composed of bonded hydrogen and carbon. They can be categorized depending on the bonds that they make. Alkynes are __________.

• A. Hydrocarbons that contain only single bonds.
• B. Hydrocarbon that contains at least one carbon-to-carbon double bond.
• C. Hydrocarbon that does not have any carbon bonds.
• D. Hydrocarbon with at least one carbon-to-carbon triple bond

Which of the following is NOT a chemical reaction?

• A. freezing carbon dioxide
• B. rusting of metal
• C. ripening of fruit
• D. burning paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are the products of the reaction of MgCl₂ and KOH?

• A.  Mg(OH)₂ + KCl
• B.  MgK + HCl
• C. Mg + KCl₂ + H2O
• D.  MgO + K + HCl

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What kind of chemical reaction is the following? CaCO₃ → CaO + CO₂

• A. Single Replacement
• B. Decomposition
• C. Double Replacement
• D. Combination

During an experiment, Julie mixed water with Ammonium nitrate in a beaker. Upon touching the container she felt that it was cold. Why?

• A.  An endothermic reaction occurred
• B. Nuclear fission just occurred
• C. An exothermic reaction occurred
• D.  Nuclear fusion just occurred

Tags

NGSS.HS-PS1-4

An element has 19 protons, 19 electrons and 24 neutrons. Find its mass number.

• A. 32
• B. 38
• C. 62
• D. 43

The pH level of water is Brgy. Compostella is at 6.5. Which means that it is _____________.

• A. acidic
• D. organic
• C. basic
• D. dirty

Tags

NGSS.MS-PS1-2

In a reaction, when the rate forward reaction is the same with the rate of the reverse reaction means ___________.

• A. No heat is being supplied to the reaction
• B. That no reaction occurred
• C. The concentration of the reactants is saturated
• D. Chemical equilibrium has been attained

Tags

NGSS.HS-PS1-6

The medicine Paracetamol is made up of 63.58% Carbon, 5.96% Hydrogen, 9.27% Nitrogen and 21.19 % Oxygen. Using the atomic masses of the following elements,  find the empirical formula of paracetamol. 
C = 12.00, H = 1.00, N = 14.00, O = 16.00
 

• A.  C₈HN₉O₂
• B.  C₁₂HN₂O₄
• C.  C₈H₉NO₂
• D.  C₈H₉N₃O₂

Tags

NGSS.HS-PS1-2

Copper plating is done using copper(II) sulfate (CuSO₄) which is derived from sulfuric acid (H₂SO₄) and CuO (copper oxide). The reaction is shown in the chemical equation below. How many grams of CuSO₄ will be produced by 0.5 moles of sulfuric acid (H₂SO₄)? 
CuO+H₂SO₄ → CuSO₄+H₂O
Molar mass of Elements
H = 1.00, O = 16.00, S= 32.07, Cu = 63.55

• A. 159.62
• B. 48.00
• C. 79.81
• D. 63.55