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Gelneren [198K]
3 years ago
15

what do the colors produced by fireworks indicate? a. a physical change c. a state change b. a chemical change d. an element cha

nge
Chemistry
1 answer:
Nat2105 [25]3 years ago
6 0
B. A chemical change 
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What happens when burning matchstick is held near the nitrogen gas jar​
NARA [144]

Answer:

The oxygen produced is collected in the gas jar by downward displacement of water. When we insert the glowing matchstick in the jar containing the oxygen gas ,it burns with a bright light which proves that gas is oxygen because oxygen is supporter of combustion.

8 0
2 years ago
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The mountain peaks shown below were initially formed millions of years ago through the processes of folding, faulting, and overt
algol [13]

Answer:

A. Erosion  

Explanation:

Erosion is the process in which soil and rock are worn away and transported by wind or water and transported to another location.

The image below shows how water has eroded a coastline.

B is wrong. Chemical weathering is the disintegration of rocks by reactions with water and the acids dissolved in it

C is wrong. Deposition is the process in which sediments carried by wind, water or ice are deposited at another location.

D is wrong. Physical weathering is the breakdown of rocks and soil by physical processes like the freezing of ice in the cracks of rocks.

6 0
3 years ago
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a teacher divides her class into groups and assigns each group a task of measuring the mass of the same object three times.the t
RoseWind [281]

Answer:

This question lacks options, the options are:

A. Group C: 32.1 g, 35.0 g, 25.0 g

B. Group B: 25.5 g, 25.0 g, 24.8 g

C. Group A: 28.5g, 28.4 g, 28.5 g

D. Group D: 20.0 g, 25.0 g, 30.09

The answer is C. GROUP A

Explanation:

Precision in measurements refers to the degree of closeness between the repeated or measured values irrespective of how close they are to the true or accepted value, which is 25g in this case.

The precision of a measurement can be determined by simply finding the range (highest - lowest) of the measurements. The lowest range represents the most precise. The measurements for each group are:

Group C: 32.1 g, 35.0 g, 25.0 g

Range = 35.0 - 25.0 = 10g

Group B: 25.5 g, 25.0 g, 24.8 g

Range = 25.5 - 24.8 = 0.7g

Group A: 28.5g, 28.4 g, 28.5 g

Range: 28.5 - 28.4 = 0.1g

Group D: 20.0 g, 25.0 g, 30.09

Range = 30.09 - 25.0= 5.09g

Based on the ranges of the measurements in each group, one would notice that Group A has the lowest range (0.1g), hence, GROUP A is the most precise.

6 0
3 years ago
Boiling Point is the __________. *
sergiy2304 [10]
Boiling point is the temperature at which a liquid boils and turns to a gas.

Hope this helps!! (:
7 0
3 years ago
HELPP WELP! If temperature increases in a gas and the volume is held at the same level, what happens to pressure?
ziro4ka [17]

it decreases

ps i guessed

5 0
4 years ago
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