CHEMISTRY MIDDLE SCHOOL

Over a long period of time, a group of people were exposed to high degrees of UV radiation from the sun. While no one became sick immediately, doctors did predict that those exposed had an increased risk of cancer in skin cells. Which type of mutation will this exposure cause? A. acquired, harmful B. acquired, neutral C. inherited, beneficial D. inherited, neutral

Answers

Answer 1
Answer:

Answer:

acquired/harmful

Explanation:

This type of mutation and exposure will cause indefinite problems.
Answer 2
Answer: A. because they did not inherit cancer from their family they accuired it from the sun and cancer is harmfull so its A.

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Given the balanced ionic equation:3Pb2+ + 2Cr ==> 3Pb + 2Cr3+ What is the number of moles of electrons gained by 3.0 moles of lead ions? (1) 5.0 mol (3)3.0 mol (2) 2.0 mol (4) 6.0mol
Which net force occurs when combined forces are balanced? A. 0 NB. 50 NC. 100 N

5.26 grams of Ca atoms to moles.

Answers

Answer:

0.131 moles.

Explanation:

moles=mass ÷ molar mass

Which clement is a liquid at STP?
(1) bromine (3) francium

(2) cesium (4) iodine

Answers

(1) bromine ..................
(1) Bromine is the correct answer.

Sort the sentences based on whether the attributes they describe belong to planets or an object that isn't a planet.The object orbits the
The object is a satellite
Sun
The regions surrounding
the object are free from
debris
The object is triangular
in shape.
Planet
Not a Planet
2019 Edmentum All rights

Answers

Answer:

Planet: The object orbits the sun

Not planet: The object is a satellite

Planet: The regions surrounding the object are free from debris

Not Planet: The object is triangular in shape.

Explanation:

A planet is characterized as:

Spheroidal (or at least big enough to be round-ish)

It should orbit the sun (not other planets, so satellites like the moon is not considered as a planet)

It should have no debris, or cleared of debris around its orbit

Although there is now the dwarf planet category, it satisfies almost all charateristics to be considered a planet, except the cleared of debris part.

Answer:

Planet: The object orbits the sun

Not planet: The object is a satellite

Planet: The regions surrounding the object are free from debris

Not Planet: The object is triangular in shape.

if 20.0g of N2 gas has a volume of 0.40L and a pressure of 6.0atm, what is the temperature in degrees celsius?

Answers

Answer:

-232 °C

Explanation:

We can use the Ideal Gas Law and solve for T.

pV = nRT

Data:  

m = 20.0 g

p = 6.0 atm

V = 0.40 L

R = 0.082 06 L·atm·K⁻¹mol⁻¹

Calculations:

1. Moles of N₂

\text{n} = \text{20.0 g} * \frac{\text{1 mol}}{\text{28.01 g}} = \text{0.7140 mol}

2. Temperature of N₂

\begin{array} {rcl}pV & = & nRT\n\text{6.0 atm} * \text{0.40 L} & = & \rm\text{0.7140 mol} * 0.08206 \text{ L}\cdot\text{atm}\cdot\text{K}^(-1)\text{mol}^(-1) * T\n2.40&=&0.05859T\text{ K}^(-1)\nT& =& \frac{2.40 }{0.05859\text{ K}^(-1)}\n\n & = & \text{41.0 K}\end{array}

3. Convert the temperature to Celsius

T = (41.0 - 273.15) °C = -232 °C

How to I find the number of electrons in and Atom?

Answers

Look at the atomic number of an element on the periodic table which is the smaller number.
The atomic number shows the number of protons/electrons so the number of protons and electrons are the same.
Whereas the mass number of an element (the other number) is the number of protons + neutrons.

What are the three states in which most matter occurs

Answers

solid, liquid, and gas.
Solids, liquids, gas'
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