chemical or physical change?
Chemical or physical ? Give clue.
Making coffee
Physical - making a mixture
homogenous to the naked eye and heterogeneous under microscope.
Colloid
Allows you to identify a specific substance.
Characteristic property
energy found in wood
chemical energy
CO₂ is an example of a
chemical formula
Chemical or physical ? Give the clue.
Jewelry that has tarnished
Chemical - unexpected colour change.
Made up of identical atoms.
element.
Which of these is non-characteristic?
Density, solubility, volume, or acidity level
volume
Types of energy in a pendulum of a clock
kinetic and gravitational
the mass of the reactants is equal to the mass of the products
the law of conservation of matter
Chemical or physical ? Give the clue.
What is happening in the kidneys
Physical - separation of a mixture.
Can be separated through a chemical reaction only.
compounds.
Density of 1g/ml ?
water
most energetic radiant energy
gamma rays
coefficients
Chemical or physical? Give the clue.
A crystal forming from a cooling supersaturated solution.
physical - change of state - solidification.
solvent in windshield wiper fluid
Alcohol
How to test for the presence of strontium? Test and result.
Flame test = red.
chemical > electrical, kinetic, acoustic, thermal.
what does (aq) mean ? Explain it.
Chemical or physical ? Give the clue.
What's happening in the mouth.
Both! Chewing = deformation
enzymes = decomposition
In a homogenous mixture, there is always _______ solvent and ___________________ solutes, though __________________________.
In a homogenous mixture, there is always one solvent and one or more solutes, though only one particle is visible.
Test for identity of salt if you can't take the volume easily.
solubility
energy transformations from sun to solar powered street sign
nuclear (sun)> radiant (sun rays)> radiant, electrical, thermal (on solar panel)> radiant (street sign)
Balance this equation.
Fe + Cl₂ → FeCl₃
2Fe + 3 Cl₂ → 2 FeCl₃