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Diano4ka-milaya [45]
3 years ago
13

What does it mean to be an exact number? Give an example of an exact number.

Chemistry
1 answer:
PIT_PIT [208]3 years ago
4 0

Answer:

An exact number is a value that is known with complete certainty. Like for Examples of exact numbers are counted numbers of objects or certain unit conversions. For example, there are exactly 3 feet in 1 yard. There are exactly 12 eggs in a dozen. A class may contain exactly 25 students.

Explanation:

Hope this helps.

Have a good night ma´am/sir.

Be safe!

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2 years ago
Which of the following substances has the lowest density?
Likurg_2 [28]

Answer:

C) A mass of 750 g and a volume of 70 dL .

Explanation:

Hello,

In this case, for substantiating the substance having the lowest density we need to compute it in the same units for each case as shown below:

\rho=\frac{m}{V}

A) \rho =\frac{1.5kg}{1.2L}*\frac{1000g}{1kg} *\frac{1L}{1000mL}=1.25g/mL

B) \rho =\frac{25g}{20mL}*=1.25g/mL

C) \rho =\frac{750g}{70dL}*\frac{10dL}{1L}*\frac{1L}{1000mL} =0.107g/mL

D) \rho =\frac{15mg}{25\mu L}*\frac{1g}{1000mg} *\frac{1000\mu L}{1mL}=0.6g/mL

Therefore, the lowest density corresponds to C) A mass of 750 g and a volume of 70 dL

Regards.

8 0
3 years ago
Identify each pair of elements as likely to participate in ionic bonding when bonded together. Use your periodic table.
alekssr [168]

Answer:

1) NaCl, 5)MgS

Explanation:

What makes something an Ionic Bond:

  • Ionic bonds are generally between two oppositely charged ions. Usually salts are formed.
  • A metal and nonmetal are also generally considered to be ionic.
  • Electronegativity also plays a role in a difference of electronegativity of elements being greater than 2.0.

For 1) Na has a charge of 1+ and Cl has a charge of 1-. They both come together to form table salt. Their electronegativity is also larger than 2.0. Also Na is a metal and Cl ion is a nonmetal.

For 2) C and O are both nonmetals and are covalent bonds

For 3) Water is a polar covalent molecule because there is a electronegativity difference between H and O, but not great. H and O are also nonmetals.

For 4) While Fe is a metal and O is a nonmetal, their electronegativity difference is not greater than 2.0. This makes it polar covalent.

For 5) Mg is a metal and S is a nonmetal. They have a large electronegativity difference. Also Mg has a charge of 2+ while S has a charge of 2-.

5 0
3 years ago
Picture a neutral P atom. This neutral atom will have
aleksandr82 [10.1K]

Answer:

It will have 5 valence electrons as its in group 5.

The atom will gain as its closer to the full configuration 8.

The charge will be 3- as it will gain 3 electrons.

3 0
3 years ago
C8H8O2 are two organic compounds,write their name?
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(I THINK THIS IS THE ANSWER IM NOT SURE)
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