Science pt I
A sample of water has a mass of 193 g salt is added to the water in the final solution ways to 238g how much salt was add
45
Solution a has a mass of blank G solution B has a mass of 60 g when they are mixed 120 g is the final weight
60
Approximately ______ atoms can fit across a human hair
1 million
A cup of orange juice weighs 230 g 3 cups of ice way 10 g each how much does a cup of one shoe swear after the ice is added
280 grams
You can speed up the reaction if you break this old reactants up into smaller pieces. Which factors of does this describe?
surface area
After you form your hypothesis, you need to
Do research
______is another name for a homogenous mixture
Solution
The following is not matter: air rocks sound water
Sound
All atoms are the same
Substance
What is considered the building block of matter?
The atom
All the Atoms have the same amounts of: protons neutrons electrons none of the above
None Of the above
Three examples of a physical change is A. Boiling water, a new rusting, a metal candle B. doing ice, mowing the lawn, carving a statue C. A pond freezing, breaking glass, a burning candle
B
Which of the following is not a possible sign of a chemical change
Change in state
Information gained from an experiment
Data
When a newspaper is left in the sun for a few days the paper begins to yellow. The yellow color is a sign of a
Chemical Change
The measurement of an object's mass is
A physical property
The ability of an apple to change color when exposed to air is a
Chemical chance
Which of the following is not an aspect of density that could be used to separate mixtures? Says independent tractive force amounts of mass per unit of all you objects with greater density sink
Attractive force
The liquid burned easily
Chemical property
The muffins baked for 20 minutes until done
Chemical property
CH4+2H2O
Co2+2H2O
Two or more elements combined
Compound
The amount of substance in a certain volume is the
Concentration
Which of the following methods to separate mixtures is not an aspect of solubility? Size of the matter de ability of one substance is all the other the inability of one substance to dissolve in another each part of the Mctier a boil or mouth are the different temperature
Each part of the make sure will boil at a different temperature
Composition definite
Element
A. Organized process used to test a hypothesis
Experiment
The following is not matter: force, moon, sunlight, grass
Force
Judgement based on the result of the exparament
Hypothesis
Has mass and takes up space
Matter
When two or mor substances are combined so each substance can be separated by physical means, the result is a
Mixture
When a log burns in the fire,
New substances are formed
______ is not a homogenous mixture
Permanent press fabric
The shape of an apple is a
Physical Property
A box that is 4x3x8
Physical property
The ability for a pond to freeze over in the winter is a
Physical property
The dessert tasted rich and chocolaty
Physical property
Which of the following parts is not part of an atom proton neutron positron electron
Positron
Which of the following is not a factor that affects the rate of a chemical reaction? Concentration, pressure, surface area, temperature
Pressure
The first step in the scientific method
Problem
In a chemical equation formulas to the right of the arrow represent the
Products
In a chemical equation, the formula so the left of the errow represent the
Reactants
When Adams rearrange and bond to form a new substance it is called a
Reaction
Which of the following is not an aspect of the state of matter that could be used to separate mixtures? Size independent whether something is a solid liquid or gas the ability of one substance dissolved in another liquid to be poured off a solid
Size independant
When a chunk of dry ice is at room temperature, a cloud of carbon dioxcie vapor forms. The carbon dioxcide is changing from a
Solid to a gas