All categories

3 years ago

Please help will name brainliest, I'd appreciate it

Chemistry

1 answer:

Natasha2012 [34]3 years ago

7 0

Answer:

Explanation:

Heat flow equation => q = m·c·ΔT

m = mass in grams = 10.00 grams

c = specific heat (a constant) = 0.900j/g·°C

ΔT = temperature change in °C = 50°C - 25°C = 25°C

q = (10.00g)(0.900j/g·°C)(25°C) = 225 joules absorbed*

*absorbed => endothermic process => need to show 'plus' energy change.

If the reactions were an exothermic process the problem would use terms like energy released, energy lost, energy given-up, etc... => would require using a 'negative' signage before the calculated energy value. So, the correct choice is the +225 joules value.

You might be interested in

Which one is idk what it is giving brainliest

Salsk061 [2.6K]

Answer:

B or C

Explanation:

I don't really know sorry.

8 0

2 years ago

Read 2 more answers

Which causes genetic variations and can result in different alleles?

erastova [34]

Answer:B random mutations

Explanation: Because I took the test

8 0

2 years ago

Read 2 more answers

Draw the Lewis structure of IF−2 I F 2 − MY ANSWER IS WRONG

Delicious77 [7]

Answer:

of course its wrong smh

Explanation:

5 0

2 years ago

Use the portion of the periodic table shown below to answer the questions. A portion of the first three columns of the periodic

Alja [10]

Part 1: Potassium, and Rubidium.Part 2: Calcium has 20 protons and 20 electrons because the atomic number for calcium is 20 and that determines how many protons there are and in an atom, the number of protons is the same number of electrons. Calcium has about 20 neutrons. I got the number of Neutrons by subtracting the mass number(40.078) and the atomic number(20), I got 20.078. Round to the nearest whole number because you cannot have half or partial neutron. So, Calcium has 20 protons, 20 electrons, and 20 neutrons,
Hope this helps and please mark as brainliest!

3 0

2 years ago

Read 2 more answers

During a reaction, ΔH for reactants is −750 kJ/mol and ΔH for products is 920 kJ/mol. Which statement is correct about the react

Triss [41]

Answer: The statement it is endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed, is true.

Explanation:

A chemical reaction in which heat energy is released is called an exothermic reaction. For exothermic reactions, the value of $\Delta H$ is always negative.

A chemical reaction in which heat energy is absorbed is called an endothermic reaction. For endothermic reaction, the value of $\Delta H$ is always positive.

In endothermic reactions, energy required for breaking the bonds between reactants is less than the energy when products are formed due to which the value of $\Delta H$ remains positive.

Thus, we can conclude that the statement it is endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed, is true.

8 0

2 years ago