Determine the number of protons and neutrons in an isotope of bromine (br) with a mass number/atomic mass of 79. (the atomic number of bromine is 35.)

Answers

Answer 1

Answer: 44 neutrons and 35 protons. The number of neutrons you have is equal to the atomic mass minus the atomic number.

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Bill stands near a swimming pool and notices that the water around his feet is a lot cooler than the water near the surface. which process causes this difference in temperature?
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In the equation N2(g) + 3H2(g) → 2NH3(g), how many liters of hydrogen combines with 10 liters of nitrogen?

Each type of mineral has a chemical composition that isA. unique to that mineral
B. similar to other minerals
C. variable depending on where its found
D. influenced by heat and light

Answers

Answer: C. variable depending on where its found

The chemical compositions of minerals is very necessary in order to define or describe a certain mineral. Some minerals can be written in simple chemical formula while others are also written in complicated chemical formulas.

Antacids work to relieve stomach acids because of which of the following types of reactions? A) decomposition
B) double-displacement
C) synthesis
D) single-displacement

Answers

Answer: The correct answer is Option B.

Explanation:

Decomposition is a type of chemical reaction in which larger compound breaks down into two or more smaller compounds.

$AB\rightarrow A+B$

Double displacement reactions is defined as the chemical reaction in which exchange of ions takes place.

$AB+CD\rightarrow AD+CB$

Synthesis reaction is a type of reaction in which two or more smaller compounds combines to form a single large compound.

$A+B\rightarrow AB$

Single displacement reaction is a type of reaction in which a more reactive metal displaces a less reactive metal from its chemical reaction.

$A+BC\rightarrow AC+B$

In stomach, an acid is present known as hydrochloric acid and to neutralize its effect, antacid is taken which has $CaCO_$ as a component.

The reaction between HCl and $CaCO_3$ is a type of neutralization reaction and it is a type of double displacement reaction.

The equation between the two follows:

$CaCO_3+HCl\rightarrow CaCl_2+H_2O+CO_2$

Hence, the correct answer is Option B.

1. What kind of diagram shows how energy flows from one organism to another?a. producer c. consumer
b. ecology d. food chain

Answers

It would be D.the food chain

One faraday of electricity will liberate one gram-atom of the metal form a solution .

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One faraday of electricity will liberate one gram-atom of the metal form a solution of CuSO4 or copper sulfate.

How are science and technology related?A. Technology is a branch of natural science.
B. Science is a branch of technology.
C. Advances in science may lead to advances in technology and vice versa.
D. Science and technology are not related

Answers

It's not A because technology is a branch of applied science. It's not B because again, technology is a branch of science, not the other way around. It's not D because they are related with one being a branch of another. Therefore, it has to be C because scientific advances do lead to technological advances.

C. Advances in science may lead to advances in technology and vice versa is the correct answer~

PLEASE HELP CHEM BABES I HAVE BEEN CRYING FOR A WHILE NOW 1. Calculate the mass of nitrogen dioxide (NO2) present in a 0.831 L container if the pressure is 100 kPa at a temperature of 27 oC. R = 8.31 kPa x L / mol x K. (K = oC + 273).

2. A 33.2 L tank contains 280 g of compressed helium. If the pressure inside the tank is 700.0 kPa, what is the temperature of the compressed gas? You must convert the mass of helium into moles using the molar mass of He. The conversion factor will be 1 mol / molar mass of helium. R = 8.31 kPa x L / mol x K

Answers

Answer: See below

Explanation:

1. To calculate the mass, you know you can convert by using molar mass. Since mass is in grams, we can use molar mass to convert moles to grams. This calls for the Ideal Gas Law.

Ideal Gas Law: PV=nRT

We manipulate the equation so that we are solving for moles, then convert moles to grams.

n=PV/RT

P= 100 kPa

V= 0.831 L

R= 8.31 kPa*L/mol*K

T= 27°C+273= 300 K

Now that we have our values listed, we can plug in to find moles.

$n=((100kPa)(0.831L))/((8.31kPa*l/molK)(300K))$