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Black_prince [1.1K]
3 years ago
15

PLEASE HELP 8TH GRADE SCIENCE. which of the following is the correct Lee abbreviated SI unit describing the mass of an object

Chemistry
2 answers:
Licemer1 [7]3 years ago
6 0
Lucky guess dont put as a answer c.m
melamori03 [73]3 years ago
3 0
D. kg b/c to know the mass of an object you must measure it in grams
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How do you balance the equation Hydrogen plus Oxygen yield water?
Andre45 [30]
Hey there! Hello!

Not sure if you still need the answer to this question, but I'd love to help out if you do. 

So, the way to balance this equation is pretty simple. First, you need to keep in mind that molecules of hydrogen and oxygen do not come in single molecules, but in bonded pairs, represented by H2 and O2. 

H2+O2=H2O

But, that's incorrect. The combination of 2 hydrogen molecules with 1 oxygen molecule yields water, but that leaves one oxygen molecule leftover. When broken down, this is how many of each molecule is on each side of the previously stated equation:

Left:
H: 2
O: 2

Right:
H: 2
O: 1

So we have to multiply H2O on the right side by 2 in order to get this:

H2+O2=2(H2O)

Left: 
H: 2
O: 2

Right: 
H: 4
O: 2

The last step is to multiply H2 on the left by two to make it match up with the right side, balancing the equation:

2(H2)+O2=2(H2O)

Left: 
H: 4
O: 2

Right: 
H: 4
O: 2

That makes our equation balanced! I hope this helped you out, feel free to ask any additional questions if you need further clarification. :-)
5 0
3 years ago
Which metal reacts quickest in this group (Li, Na, K, Rb and Cs) Why?
Tamiku [17]
Ok so all are in the alkali family also they are all metals and in group 1 but I think the one that might reacts quickest is Li because it has less AMU
3 0
3 years ago
What Is Modern Methods Of Agriculture Practices And its Advantages?
Olin [163]

Answer:

Explanation:

Modern Agriculture - The agricultural practices with modern technique like Fertilizers, Innovative hybrid seed, and utilization of machine call modern Agriculture.

Advantages -

Feeding to the population without scarcity of food grains.

Optimum Utilization of land (Crop intensity more then 300%)

Increased production of food grain.

Global Market - even our mangoes available at US and we are getting California apple too.

Due to factories and Machine use this industry is growing to and empowering good employment.

I hope this helps you :)

7 0
4 years ago
Read each statement regarding food and beverages in the lab and determine if each is true or false.
Scrat [10]

Answer:

1. True

2. False

3. False

4. True

Explanation:

A lab is an abbreviation for laboratory and it can be defined as a building that is equipped with scientific equipments and apparatus, which are used for performing scientific experiments, manufacturing of chemicals and drugs, research, testing and analysis of hypothesis in order to establish a theory.

Generally, laboratory scientists, technicians, students and anyone going into a laboratory is prohibited from taking in edible items such as food and water.

Basically, all laboratories are required to place a visible warning sign around the lab prohibiting the bringing in and ingestion of food in any form.

1. True: Tobacco products of all kinds are prohibited in lab.

2. False: Beverages are allowed in lab as long as they are in containers with lids. It's completely prohibited from the lab so as to prevent food poisoning.

3. False: Chewing gum is okay in the lab as long as you don't blow bubbles.

4. True: Food items should not be brought into the lab.

6 0
3 years ago
A sample of argon (Ar) gas has a volume of 7.31 L at a pressure of
Pie

Answer:

17.1 L

Explanation:

P1V1/T1  =  P2V2/T2        T is in K

P1V1/T1 * T2/P2 = V2

735 * 7.31 / (45+273.15)  * (55+ 273.15)/325 = V2

V2 = 17.1 L

3 0
2 years ago
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