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Description
Flashcards by Natalia Ramos Escalada, updated more than 1 year ago
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Created by Natalia Ramos Escalada
about 4 years ago
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| Question | Answer |
| An object/material which you can see through it is... | transparent |
| An object/material which you can't see through it is... | opaque |
| When an object it is easy to break, it is... | fragile |
| How many forms does matter have? | It has 3 forms: -Solid -Liquid -Gas |
| What matters if you heat ice? | It will melt and it turns into liquid |
| What matter if you put a liquid into the freezer? | It will freeze and become a solid again |
| How is a physical change? | It is reversible (we can turn the substance back to its original shape) |
| Can you explain an irreversible physical change? | When we break a glass vase. We change the appearance of the vase, the chemical properties are the same, but we can't change the pieces back to their original form (the vase) |
| What does it happen if there is a chemical change? | A new substance is produced |
| How are chemical changes? | They are irreversible. |
| In which chemical change ash and smoke are produced? | Combustion |
| In which chemical change metals react with oxygen and water? | Oxidation |
| Which substance is produced in oxidation? | Rust |
| When organic material decomposes, which chemical change occurs? | Putrefaction |
| What is a mixture? | It is something that contains two or more different materials |
| Can you name examples of mixtures? | Air (made of several gases) Salty water (salt, water and minerals) Rocks and minerals Salad |
| Can you see the different substances in homogeneous mixtures? | We can't see them, but it sometimes is possible to separate the substances. Example: milk with chocolate mayonnaise |
| Can you see the different substances in heterogeneous mixtures? | We can see them, it's easy to separate substances. Examples: Fruit salad |
| Which methods are used to separate mixtures? | Sieving Filtration Evaporation |
| Which method can be used to separate solids of different sizes? | Sieving |
| Which method can be used to separate solids from liquids? | Filtration |
| Which method can be used to separate a solid that is dissolved in water? | Evaporation |
| What is mass? | It is the amount of matter something contains |
| How can we measure mass? | In grams (g) 1000 grams= 1 kilogram |
| What is volume? | It is the amount of space that something occupies |
| How can we measure volume? | In mililitres (ml) 1000 mililitres= 1 litre |
| What do you use to measure mass? | Scale |
| What do you use to measure volume? | Measuring jug |
| Gases do not have definite size or..... | a definite volume |
| Liquids do not have a definite shape but, | they have a definite volume |
| Solids have.... | definite shape and definite volume |
| How can we calculate density? | Dividing the mass of an object by its volume (kg/l) |
| What does density explain? | It explains why some objects float on water and why other sink |
| Why does cork float? | Because cork has a lower density than water |
| Why does iron sink? | Because iron density is greater than water |
| What is a force? | It is push or a pull that acts on an object |
| What kind of forces act from a distance and do not make direct contact with the object? | Non - contact forces Gravity Magnetism |
| What kind of forces act through physical contact? | Contact forces Friction Buoyancy |
| What is gravity? | It's a force that attracts all objects towards each others. |
| What is magnetism? | It's a force of attraction or repulsion caused by magnetic objects |
| How does friction act? | It acts in the opposite direction to the direction of the movement |
| How does buoyancy act? | It acts in the opposite direction on objects immersed in a liquid |
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