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3 years ago

1. Select all the statements about the nucleus of the atom that are correct:

Chemistry

1 answer:

erik [133]3 years ago

8 0

Answer:

Explanation:

1. Select all the statements about the nucleus of the atom that are correct:

Group of answer choices

B. It contains Protons

D. It has a Positive Charge

E. It contains Neutrons

2. An atom of an element with atomic number 50 and mass number 120 contains:

Group of answer choices

B. 50 protons, 50 electrons, and 70 neutrons

3. Which of these statements is false?

Group of answer choices

D. Electrons have the same mass as a proton but have the opposite charge.

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Warning signs are sometimes placed on aerosol cans to prevent people from throwing them into a fire. What would be true about th

GarryVolchara [31]

Answer:

The correct option is volume stays constant

Explanation:

When a gas container (in this case an aerosol can) is subjected to heat (from fire), the temperature of the can and subsequently the temperature of the gas itself increases, an increase in the temperature of the gas cause the pressure to also increase; as the gas molecules will collide more and faster with each other and against the wall of the can. However, the volume of the gas will remain the same as before it was subjected to the heat - the gas particles do not get destroyed or increased as a result of the heat (law of conservation of matter explains this).

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3 years ago

Read 2 more answers

Balance AI(NO3)3 + H2SO4 → Al2(SO4)3 + HNO3

nikklg [1K]

Answer:

2Al(NO3)3 + 3H2SO4 → Al2(SO4)3 + 6HNO3

Explanation:

i just looked up how to balance it, i dont really know how to balance it exactly

5 0

3 years ago

*PLEASE HELP ASAP*

dimulka [17.4K]

I believe its true , because when two elements form different compounds a given mass of one element will combine with the other , during any chemical change atoms arent created or destroyed they are jus rearranged

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3 years ago

What is the half-life of a pharmaceutical if the initial dose is 500 mg and only 31 mg remains after 6 hours?

Sergeu [11.5K]

Answer:

$\large \boxed{\text{b. 1.5 h}}$

Explanation:

1. Calculate the rate constant

The integrated rate law for first order decay is

$\ln \left (\dfrac{A_{0}}{A_{t}}\right ) = kt$

where

A₀ and A_t are the amounts at t = 0 and t

k is the rate constant

$\begin{array}{rcl}\ln \left (\dfrac{500}{31}\right) & = & k \times 6\\\\\ln 16.1 & = & 6k\\2.78& =& 6k\\k & = & \dfrac{2.78}{6}\\\\& = & 0.463 \text{ h}^{-1}\\\end{array}$

2. Calculate the half-life

$t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{\text{0.463 h}^{-1}} = \textbf{1.5 h}\\\\ \text{The half-life is $\large \boxed{\textbf{1.5 h}}$}$

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3 years ago

Balance the equation by ion electron method

irina1246 [14]

Answer:i believe you are to decompose the formula (i think)

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2 years ago