All categories

2 years ago

I need help with this! I don't fully understand it

Chemistry

1 answer:

ZanzabumX [31]2 years ago

6 0

Answer:

1. highest is 25.7c° and lowest is 20.0c°

2.Is Exothermic. An Endothermic Reaction is a chemical reaction that absorbs energy in the form of light or heat. In it, the energy or enthalpy of the reactants is less than that of the products. An Exothermic Reaction is a chemical reaction that gives off energy in the form of light or heat.

3. Reactans.

4. The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.

You might be interested in

Srihari has a torch with him and 2 new batteries. However, the torch requires 3 batteries to work. Is there any way Srihari can

zloy xaker [14]

Answer:

go to the store to buy more batteries

Explanation:

6 0

3 years ago

Decreasing the temperature of a reaction decreases the reaction rate because

Elza [17]

The answer u are looking for is b

4 0

3 years ago

Read 2 more answers

How many mL of a stock 50% (w/v) KNO3 solution are needed to prepare 250 mL of a 20% (w/v) KNO3 solution?

Andre45 [30]

Answer:

100ml of a stock 50% KNO3 solutions are needed to prepare 250ml of a 20% KNO3 solution.

Explanation:

In the given question it is mentioned that

S1=50%

V2=250ml

S2= 20%

We all know that

V1S1=V2S2

∴V1= V2×S2÷S1

∴V1= V2S2×1/S1

∴V1= 250×20÷50

∴V1= 100ml

6 0

3 years ago

A gas mixture with a total pressure of 765 mmHg contains each of the following gases at the indicated partial pressures: 134 mmH

ladessa [460]

Answer: c

Explanation:

4 0

3 years ago

As a forensic expert, Jane needs to handle many biological evidence samples simultaneously. What is the basic precaution that sh

madreJ [45]

Answer:

B. use a new pair of gloves for each piece of evidence

Explanation:

When it comes to the basic precautions of handling biological evidence samples, one has to prevent cross contamination. This refers to the<em> transfer of DNA from one evidence to another evidence</em>; thus, it is important for Jane to use a new pair of gloves for each piece of evidence in order to prevent such occurrence.

Wearing of gloves will also <em>prevent Jane's DNA from being implanted into the sample</em>, and it will keep her safe from contracting blood-borne pathogens like those in the saliva, blood or semen.

7 0

3 years ago