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worty [1.4K]
3 years ago
9

NEED HELP ASAP PLEASE

Chemistry
2 answers:
My name is Ann [436]3 years ago
7 0
A. Mg and Ca

They have similar reactive properties; they’re both Alkaline Earth metals.
scoray [572]3 years ago
4 0
A.

Magnesium and calcium are both in the same group and will bond ionically with sulfur.
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3.How are climate and weather different?
Lera25 [3.4K]
Number 3. c.

Number 4. a.

Number 5. d.
7 0
2 years ago
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Which statement best describes the movement of atoms in a solid? They are able to slide past each other. They spread apart as fa
ANTONII [103]
The answer is: They have no freedom to move.
However is not completely true, as even in a solid atoms still a move a bit (vibrations).

If atoms were able to slide past each other, then we would have a liquid not a solid. Liquids "flow" but never really "break apart" this is because atoms are sliding between them, think of these as a bucket of marbles rolling down a slope.

If they are free to move in all directions, then you have a gas; that's why someone uses perfume in a room, eventually everyone smells it.
4 0
3 years ago
Read 2 more answers
3. A speedometer in a car reads 78 miles per
Marrrta [24]

If the speedometer in a car reads 78 miles per hour, the car's speed in kilometers per hour is 125.53 kilometers per hour.

<h3>How to convert speed?</h3>

The speed of a car is the measure of the distance moved over a given period of time, hence, it is measured in miles/hour, km/hr, m/s etc.

According to this question, the speedometer in a car reads 78 miles per hour.

Since the conversion factor of kilometers per hour and miles per hour is as follows:

1 kilometer per hour = 0.62 miles per hour

Then, 78 miles per hour = 125.53 kilometers per hour.

Therefore, if the speedometer in a car reads 78 miles per hour, the car's speed in kilometers per hour is 125.53 kilometers per hour.

Learn more about speed at: brainly.com/question/28224010

#SPJ1

3 0
2 years ago
Chem pls help and look at pics
ser-zykov [4K]

Answer:

1. 16 protons, 18 electrons, 16 neutrons

2. Ba (2+) + 2 NO3 (-) + 2 Na (+) + SO4 (-) = 2 Na (+) + 2 NO3 (-) + BASO4

Explanation:

1. By looking at the number in the top left corner, we know the mass is 32. And by looking at the number in the bottom left, we know that we have 16 protons. Now the way to find neutrons is to subtract the number of protons from the mass (32-16) which will give us 16 neutrons. Now the electrons are a bit tricky. Usually, atoms have the same number of protons and electrons, hence why atoms don't usually have a charge. However, in this case we have a charge of 2- (as seen in the top right corner) so we need to add two to the number of protons to find our number of electrons (electrons are negatively charged, so if there are more of them the atom will have an overall negative charge) and when we do that we get 18. So the final answer is 16 protons, 18 electrons, and 16 neutrons.
2. This one I'm not 100% sure on since the pictures are kinda wonky but essentially the way net ionic equations are written is that whatever is aqueous/soluble (aq) will be written separate from whatever it was bonded to with the charge shown, but solids (s), liquids (l), and gases (g) are written still bonded without the charge being shown. So in this case, everything in the reaction is aqueous except for the BaSO4 product. The parentheses are used to show charges, but won't be written in an actual equation, and the equal sign is the same as the arrow. So you're equation is written as Ba (+) + 2 NO3 (-) + 2 Na (+) + So4 (2-) = 2 Na (+) + NO3 (-) + BaSO4.
Hope this helps! :)

6 0
1 year ago
Fix the formula for KF2<br> Write out the full correct formula?
Korvikt [17]

Given :

A chemical compound KF_2 .

To Find :

Fix the formula for KF_2 and write the full correct formula.

Solution :

We know, Potassium( K ) and Fluorine( F ) both have a valency of 1 i.e potassium can donate one electron and Fluorine can accept one electron only.

So, the chemical formula KF_2 is wrong because no element has filled electron.

Therefore, to stabilise the molecule, 1 Potassium atom should make a bond from 1 Fluorine i.e KF ( correct formula ) .

Hence, this is the required solution.

7 0
3 years ago
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