Fluorine, chlorine, bromine, and iodine are part of a family called what?

Answers

Answer 1

Answer: The correct answer is "halogens." Fluorine, chlorine, bromine, and iodine are part of a family called halogens. In the periodic table, it is the column that is beside, left of the noble gases. The name 'halogen' means 'salt-producing'.

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Identify which statement is true:A. Isotopes of the same element have the same atomic number and mass number, but a different number of neutrons.
B. Isotopes of the same element have the same mass number and different atomic numbers.
C. Isotopes of the same element have the same number of neutrons and a different number of protons.
D. Isotopes of the same element have the same atomic number and different mass numbers.

Answers

D. Isotopes of the same element have the same atomic number and different mass numbers.

Answer: C. Isotopes of the same element have the same number of neutrons and a different number of protons.

Explanation: Founders Educere answer.

Good luck my fellow summer school students, I love you all.

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Which is denser, isopropyll alcohol( rubbing alchohol) or water?

Answers

Isopropyll is less dense than water.

If you were to get a gallon of water and a gallon of Isopropyll alcohol and weigh it, the alcohol would be lighted. Another way is to pour water and the alcohol in a cup and you will see that the alcohol is above the water(floating) because its lighter and less dense. Isopropyll alcohol is used for a lot of things, including cleaning certain components of computers:D

So based on this, water is more dense

Answer:

water is denser

Explanation:

if you were to fill 2 55 gallon barrels of each product the water would weigh more because water is more dense

What quantity of magnesium (in grams) is needed to supply the energy required to warm 30 mL of water (density = 1.00 g/mL) from 22°C to 90°C?

Answers

Answer:

0.22 grams of magnesium

This seems too low, so check the calculations/

Explanation:

How is the heat delivered? Is the magnesium hot and added to the water? If so, at what temperature.

Is the heat generated from an exothermic chemical reaction?

=================

I'll assume here that the heat comes from the reaction of magnesium with water. The balanced equation is:

Mg + 2H2O = Mg(OH)2 + H2

It has a heat of reaction of −924.7 kJ/mol.

We need enough Mg to heat 30 ml of water from 22°C to 90°C. The specific heat of water is needed. It is 4.184 J/g-K. It tells us that 4.184 Joules are needed to raise the temperature of water by 1 degree K.

30 ml of water with density 1 gram/ml means we have 30 grams of water. (We'll ignore the water that is added from the chemical reaction.).

Lets calculate the Joules required to raise 30 grams of water from 22°C to 90°C. Note that the specific heat has units of g and Kelvin. Since we need a temperature change, the number value for ΔT is the same for both °C and °K. So the temperature change is +68°K.

We can now calculate the Joules required:

(30 grams H2O)*(4.184 J/g-K)*(+68°K) = 8535.4 Joules or 8.5 kJ to 2 sig figs.

The Mg/H2O heat of reaction of −924.7 kJ/mol. will allow us to calculate the amount of Mg needed to supply 8.5 kJ. The minus sign tells us that the reaction RELEASES energy (the energy leaves the "system" of Mg and H2O).

Calculate the moles of Mg needed to release 8.5 kJ:

(924.7 kJ/mole)*(x moles) = 8.5 kJ

x moles = 0.0092 moles

Whoa. That is only (0.0092 moles)*(24.03 g/mole) = 0.22 grams of magnesium

This seems low to me, so check on the heat of reaction figure I used. And don't let the hydrogen get away.

Scientific explanations of natural phenomena are based on A. opinion polls of scientists. B. only the observations made by a single scientist. C. only the most recent empirical evidence. D. all the empirical evidence available.

Answers

Answer: D. all the empirical evidence available.

Explanation:

Answer:

Explanation:

32 What is the overall charge of an ion that has 12 protons, 10 electrons, and 14 neutrons?(1) 2- (3) 4
(2) 2+ (4) 4+

Answers

The charge of a proton is +1, of an electron is -1, and of a neutron is 0.

12*(+1) +10*(-1) +14*0
= 12 -10
= +2

The correct answer is (2) +2.

Hope this would help~

protons have a 1+ charge
Electrons have a 1- charge
So 12-10 is 2+

Which is classified as a renewable resource? A. coal B. wind C. oil D. uranium

Answers

The answer is B) Wind because wind will always be available, while coal, oil and uranium are objects we are digging up. This makes wind a renewable resource, therefore it is better for the environment because we can theoretically never run out of it. This is the reason we are starting to use wind to create energy; we can use it again.

The answer is obviously B. It is the only one that can continually be renewed without fail.

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PLEASE HELP WILL GIVE BRAINLIEST

Where would you find a halophile? A. salt flat B. ocean floor C. swamp or marsh D. hydrothermal vents

The bacteria that causes a disease is called a(n)A. PathogenB. PandemicC. EpidemiologyD. Toxicology

Why is the equation incorrect? Mg₃ + N₂ → Mg₃N₂(A) Some of the subscripts are incorrectly used. (B) The equation is not balanced. (C) The valence of the nitride ion is incorrect. (D) The valance of the magnesium ion is incorrect. (E) The coefficient of N₂ is incorrect. Can someone explain this one?