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natima [27]
3 years ago
8

Who is the density of on object with o moss of t20g on a volume of 7mL?

Chemistry
2 answers:
Musya8 [376]3 years ago
8 0

Answer:

2.857 g/mL

Explanation:

as we know density = mass/volume

Zinaida [17]3 years ago
7 0
2.857 g/mL.

M
——— Is a formula that can help you. You
V | D Just set this up and then plug in
what you have. So for example in
this problem you have mass and volume and are solving for density so the triangle would look like this:

20
-————
7 | D

This now tells you to divide 20 by 7 to find out the density. Now let’s say you had volume and density and were trying to solve for mass. The triangle would look like this:

M
—————-
7 | 2.857

Now the triangle shows you that you have to multiply 7 by 2.857 to find the mass. If you just remember this triangle it will save you in the future trust me.
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Cecil writes the equation for the reaction of hydrogen and oxygen below.
Wittaler [7]

Answer:

C) to show that atoms are conserved in chemical reactions

Explanation:

When writing a chemical reaction, we should always consider the Mass Conservation Law, which basically states that; in an isolated system; the total mass should remain constant, this is, the total mass of the reactives should be equal to the total mass of the products

For this case, we should add the apporpiate coefficients in order to be in compliance with this law:

2H₂ + O₂ → 2H₂O

So, we can check the above statement:

For reactives (left side):

4H

2O

For product (right side):

4H

2O

5 0
3 years ago
The sea water has 8.0x10^-1 cg of element strontium. Assuming that all strontium could be recovered, how many grams of strontium
PilotLPTM [1.2K]

984 grams of strontium will be recovered from 9.84x10^8 cubic meter of seawater.

Explanation:

From the question data given is :

volume of strontium in sea water= 9.84x10^8 cubic meter

(1 cubic metre = 1000000 ml)

so 9 .84x10^8 cubic meter

 \frac{9 .84x10^8}{1000000}      = 984 ml.

density of sea water = 1 gram/ml

from the formula mass of strontium can be calculated.

density = \frac{mass}{volume}

mass = density x volume

mass = 1 x 984

         = 984 grams of strontium will be recovered.

98400 centigram of strontium will be recovered.

Strontium is an alkaline earth metal and is highly reactive.

4 0
3 years ago
Part c how long does it take to raise the temperature of the air in a good-sized living room (3.00m×5.00m×8.00m) by 10.0∘c? note
postnew [5]
Do you have any multiple choices
4 0
3 years ago
Explain the difference between complete dominance and codominance.Give an example of each one in order to explain it.
Ira Lisetskai [31]
In complete dominance, only one allele in the genotype is seen in the phenotype. In codominance, both alleles in the genotype are seen in the phenotype. In incomplete dominance, a mixture of the alleles in the genotype is seen in the phenotype.

I hope it helps
Stay home stay safe dear !
8 0
3 years ago
How does the level of organization relate to cells? To organ systems?
kotegsom [21]
Cells make up tissues, Tissues make up Organs, and Organs make up Organ Systems.
4 0
3 years ago
Read 2 more answers
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