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Q 1/50
Score 0
A(n) is a variable representing the value being manipulated or changed.
30
dependent variable
independent variable
control group
constant
Q 2/50
Score 0
Which step of the scientific comes before a hypothesis?
30
problem
experiment
conclusion
data and result
50 questions
Q.
A(n) is a variable representing the value being manipulated or changed.
1
30 sec
Q.
Which step of the scientific comes before a hypothesis?
2
30 sec
Q.
What is the purpose of an experiment?
3
30 sec
Q.
What is a hypothesis?
4
30 sec
Q.
The steps used by scientists to solve problems and uncover facts is the __________.
5
30 sec
Q.
Mariel wants to learn more about the feeding habits of ants. What steps should Mariel take to best study the feeding patterns of ants?
6
30 sec
Q.
The statement "If plants respond positively to sunlight, then an indoor plant placed near the window will bend toward the window" is an example of __________.
7
30 sec
Q.
Which of the following is the best example of a testable question?
8
30 sec
Q.
The statement "I wonder why the dog’s wound doesn’t become infected." is an example of __________.
9
30 sec
Q.
Which step in scientific method is shown by the the following statements? "I’ll obtain a bacterial culture and grow the same kind of bacteria in two identical culture dishes. Once the bacteria start growing, I’ll add dog saliva to ONLY one of the dishes and leave the other alone. I’ll cover both dishes. Then I’ll observe what happens each day for one week. "
10
30 sec
Q.
Which of the following is NOT one of the metalloids?
11
30 sec
Q.
This element is common to all acids.
12
30 sec
Q.
13
30 sec
Q.
Which of the following is/are element/s?
14
30 sec
Q.
What do the elements sulfur (S), nitrogen (N), helium (He), and carbon(C) have in common?
15
30 sec
Q.
Oxygen and iron combine chemically to form rust. Rust is classified as which of the following?
16
30 sec
Q.
Compounds are different than elements because compounds are __________.
17
30 sec
Q.
18
30 sec
Q.
What two elements make up common table salt?
19
30 sec
Q.
Which of the following substances can be separated into simpler substances only by chemical means?
20
30 sec
Q.
Which statement identifies why oxygen is classified as a pure substance and air is classified as a mixture?
21
30 sec
Q.
Which of the following explains why saltwater is considered a mixture?
22
30 sec
Q.
When iron filings and sulfur powder are mixed together at room temperature, which one of the following statements is correct?
23
30 sec
Q.
Which of the following represents the particles in a mixture?
24
30 sec
Q.
Which one of the following is a mixture?
25
30 sec
Q.
How is a mixture different from a compound?
26
30 sec
Q.
Ariel combines water, sugar, and lemon juice to form lemonade. What type of substance was made?
27
30 sec
Q.
Dyes in water soluble markers may be separated by means of..
28
30 sec
Q.
In the process of evaporation, which one of the following pieces of laboratory apparatus would NOT be used?
29
30 sec
Q.
Salt and water in seawater can be separated using these two stages:
30
30 sec
Q.
When copper sulfate crystals are dissolved in water, the mixture is known as __________.
31
30 sec
Q.
Which one of the following statements is correct?
32
30 sec
Q.
Which one of the following substances is known as the universal solvent?
33
30 sec
Q.
When sugar is dissolved in water, sugar is known as __________.
34
30 sec
Q.
Something that can be dissolved in a solution is called
35
30 sec
Q.
The solubility of sodium chloride in 100 grams of water at 20ºC is 36 grams.
Which one of the following statements is incorrect?
36
30 sec
Q.
The solubility curve for potassium nitrate is shown in the diagram. When 80 grams of potassium nitrate is added to 100 grams of water at 20ºC and stirred, the solution is said to be __________.
37
30 sec
Q.
You are given a 40 mL solution in a beaker. You add solute to the beaker and it dissolves. The solutions was
38
30 sec
Q.
How can you tell the saturation of a solution?
39
30 sec
Q.
When a solution is saturated:
40
30 sec
Q.
The amount of solute actually dissolved in a given amount of solvent.
41
30 sec
Q.
A concentrated solution is one that contains a lot of ______
and little _________.
42
30 sec
Q.
Which one of the following statements is true?
43
30 sec
Q.
A bottle of whiskey states that it is made up of 40% alcohol.
Which one of the following statements about this whiskey is incorrect?
44
30 sec
Q.
How do you increase the concentration of a solution?
45
30 sec
Q.
What is the term we use when we have a less concentrated solution?
46
30 sec
Q.
Which solution is more concentrated?
47
30 sec
Q.
If we increase the amount of solute in a solution , but do not add any additional water. What will happen to the concentration?
48
30 sec
Q.
Solution A - of 61g/50mL
Solution B - 21g/50mL
Solution C - 41/50mL
Put them in order from most concentrated to least concentrated.
49
30 sec
Q.
When equal volumes of two solutions are weighed on the balance, which one is more concentrated?
