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umka2103 [35]
3 years ago
6

What does a scientist observe in a chemical's reaction rate?

Chemistry
2 answers:
defon3 years ago
7 0

The scientist observes at what rate is the concentration increasing or decreasing.

Softa [21]3 years ago
7 0

Answer:

The speed at which the reactants change to products over a given time.

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245 g water sample initially at at 32 oC absorbs 17 kcal of heat. What is the final temperature of water?
steposvetlana [31]

Answer:62.66°C or 235.66K

Explanation:Q=McpT, the energy was given in calories so you first convert to Joules by multiplying the value in calories by 4.184J.

17*4.184=71.128kJ.

71.128kJ=mcpT

71.128kJ=245*4.187*(T-Tm)

Tm is the final temperature of the mixture. The T is the temperature given which should be converted to Kelvin by adding 273...T=32+273=305K.

71128J=245*4.187*(305-Tm)

71128=312873.575-1025.815Tm

1025.815Tm=312873.575-71128

1025.815Tm=241745.58

Tm=241745.58/1025.815

Tm=235.66K

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3 years ago
Which of the following particles combine to form molecules?
solniwko [45]

Answer: i think its protons and electrons but it also might just be atoms because protons and electrons  make atoms when there are also neutrons

Explanation:

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3 years ago
3. How many moles of aluminum are needed to react completely with 1.2 mol of FeO?
hoa [83]

Answer:

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Explanation:

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Each degree on the Kelvin scale equals:
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A change of 1 Kelvin is exactly the same as a change of 1 degree Celsius.
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Why the recombinant DNA is reintroduced into the bacterium?
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Bacterial cells can pick up the DNA through the process of transformation. Lambda phages are used by eliminating the middle of its liner genome and adding the foreign DNA in the created space. The phage is then introduced into the bacterial cell where it replicated itself via the lysogenic cycle.
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