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Natasha2012 [34]
3 years ago
12

If a black hole is invisible how can we determine when one is present

Chemistry
1 answer:
Gelneren [198K]3 years ago
8 0

Answer: you can’t

Explanation: i’m dumb too

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If you have a graduated cylinder, containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 7.95g is dr
xxTIMURxx [149]

Answer: The density of the object will be 9.97\times 10^{-2} g/ml.

Explanation:

Density is defined as the mass contained per unit volume.

Density=\frac{mass}{Volume}

Given : Mass of object = 7.95 grams

Volume of water displaced = volume of the object = (95.2 - 15.5) ml =79.7 ml

Putting in the values we get:

Density=\frac{7.95g}{79.7ml}=0.0997g/ml

Thus density of the object will be 9.97\times 10^{-2} g/ml

4 0
4 years ago
BRAINLIESTT ASAP! PLEASE HELP :)
Nadya [2.5K]

Hello, and this is my own words Periodic trends are specific patterns in the properties of chemical elements that are revealed in the periodic table of elements. Major periodic trends include electronegativity, ionization energy, electron affinity, atomic radii, ionic radius, metallic character, and chemical reactivity.

Hope This Helps. and have good day!

3 0
3 years ago
5. How many moles are in 58.6 L of Nitrogen gas (N.) at STP?
pantera1 [17]

Answer:

2.6166 moles

Explanation:

stp means: T=273k   p=101.3kpa

R= 8.31(constant)       v=58.6  

using the ideal gas law; pv=nRt

                                        101.3 x 58.6 = n x 8.31 x 273

                                         n= (101.3 x 58.6)\(8.31 x 273)

                                         n= 2.6166moles

6 0
4 years ago
Consider the chart describing the element. According to the chart, the element is _______ with an atomic number of ___________.
GenaCL600 [577]

C) lithium; 3

Explanation:

Considering the chart describing the element. According to the chart, the element is lithium with an atomic number of 3.

  • Atomic numbers are used on the periodic table to arrange elements in their proper place.
  • Atomic number is the number of protons in an atom.
  • This number is unique for every atom.
  • From the described chart, we see that the atom described is Lithium.
  • The atomic number of neon is 10, boron is 5.
  • Unless otherwise stated or shown, it can be nitrogen 7.

learn more:

Periodic table brainly.com/question/8543126

#learnwithBrainly

4 0
3 years ago
Substances made of two or more elements chemically joined togethher are called what
slamgirl [31]

Answer:

compounds

Explanation:

Substances made of two or more elements that are chemically joined together are called <u>compounds</u>.

<em>Generally, elements are substances that contain just a type of atom. Compounds, on the other hand, contain different atoms (of different elements) that are chemically linked together. The linkage is referred to as bonding. The bonding could be covalent, ionic, or hydrogen bonding.</em>

7 0
3 years ago
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