A student measures the mass of a substance as 1.7132kg and it's volume as 0.65l. What is the density substance in g/mL? Round your answer to the correct number of significant figures

Answers

Answer 1

Answer:

Answer:

The substance has a density of 2.636 grams per mililiter.

Explanation:

We must remember that density ( $\rho$ ), measured in grams per mililiters, is the mass of the substance ( $m$ ), measured in grams, divided by its volume ( $V$ ), measured in mililiters. That is:

$\rho = (m)/(V)$

In addition, a kilogram equals 1000 grams and a liter equals 1000 mililiters. If we know that $m = 1713.2\,g$ and $V = 650\,mL$ , then:

$\rho = (1713.2\,g)/(650\,mL)$

$\rho = 2.636\,(g)/(mL)$

The substance has a density of 2.636 grams per mililiter.

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When determining whether a chemical reaction has taken place you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? es -) A) Solid melts. B) Heat is given off. Substance dissolves D) Substance changes shape. Physical Science

Answers

Answer:

B) Heat is given off.

Explanation:

When heat is given off, a chemical change must have occurred and such a reaction is termed an exothermic reaction.

A chemical change is one in which;

the process is not easily reversible
leads to the production of new kinds of matter
involves change in mass
requires a considerable amount of energy.

Most chemical reactions are accompanied by heat changes.

Where was Freon used prior to the ban on CFCs?

Answers

Answer:

The majority of automobiles manufactured prior to 1994

Explanation:

their A/C systems. Since that time, several non-CFC refrigerants such as hydrofluorocarbons (HFCs) have been developed; and many more are in the development process

Helen is standing in the hallway with her friend Janet, next to Helen's locker. Each girl has a body mass of 48 kilograms (kg), and thus each exerts a force of 470.4 Newtons (N) on the hall floor. What is the total force, in Newtons (N), that the hall floor exerts on the pair of girls?A. 940.8 N
B. 96 N
C. 960.4 N
D. 48 N

Answers

The right answer for the question that is being asked and shown above is that: "A. 940.8 N." Helen is standing in the hallway with her friend Janet, next to Helen's locker. Each girl has a body mass of 48 kilograms (kg), and thus each exerts a force of 470.4 Newtons (N) on the hall floor.

Which statement is true because of newtons second law ?a)when the net force on an object increases, the objects acceleration decreases
b)when the net force on an object decreases ,the objects acceleration increases
c)when the net force on an object decreases, the acceleration doesnt change
d)when the net force on an object decreases, the objects acceleration decreases

Answers

Newton's second law, by definition, states that, The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. Therefore, based on the given options above, the correct answer would be option D: when the net force on an object decreases, the objects acceleration decreases.

d. when the net force on an object decreases, the objects acceleration decreases

i took the test and got it right

Which of the following is not found in the nucleus of an atom? A. Neutron
B. Electron
C. Proton
D. Quark

Answers

Electron - In an atom, the central part which is composed of neutrons and protons including quarks is called the nucleus. Whereas the electron is the particle with negative elementary electric charge can be found inside the atom surrounding the nucleus.

Answer: electrons

Explanation:

because it is

A sample originally contained 1.28 g of a radioisotope. It now contains 1.12 g of its daughter isotope. How many half-lives have passed since the sample originally formed?

3
4
8
16

Answers

The answer is 3.

The relation between number of half-lives (n) and decimal amount remaining (x) can be expressed as:

$(1/2) ^(n) =x$

We need to calculate n, but we need x to do that. To calculate what percentage of a radioactive species would be found as daughter material, we must calculate what amount remained:
1.28 - 1.12 = 0.16

If 1.28 is 100%, how much percent is 0.16:
1.28 : 100% = 0.16 : x
x = 12.5%
Presented as decimal amount:
x = 0.125

Now, let's implement this in the equation:

$(1/2) ^(n) =0.125$

Because of the exponent, we will log both sides of the equation:
$n * log(1/2) = log(0.125)$
$n = (log(0.125))/(log(1/2))$
$n = (log(0.125))/(log(0.5))$
$n= (-0.903)/(-0.301)$
$n = 3$

Therefore, 3 half-lives have passed since the sample originally formed.

Answer:

Explanation:

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