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OLEGan [10]
3 years ago
12

When elements combine to form compounds does there properties change?

Chemistry
1 answer:
Amiraneli [1.4K]3 years ago
7 0
Yes, they do. The process described is a chemical reaction and it implies the change of nature of reactants and, of course, the change of its properties.
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Your Turn!
crimeas [40]

Answer:

because.......

...........

.........

3 0
3 years ago
Which of the following is NOT evidence for a chemical reaction?
miss Akunina [59]

Answer:

c

Explanation:

color chance - evidence

gas formation - is evidence

melting - is not (because its only a change in state, eg. ice--> melts into water) melting is an example of physical chance

odor - is evidence

4 0
2 years ago
What is the frequency and energy per quantum (in Joules) of :
viktelen [127]

(a) f = 5.00 × 10²⁰ Hz, E = 3.32 × 10⁻¹³ J;

(b) f = 1.20 × 10¹⁰ Hz, E = 7.96 × 10⁻²⁴J.

<h3>Explanation</h3>

What's the similarity between a gamma ray and a microwave?

Both gamma rays and microwave rays are electromagnetic radiations. Both travel at the speed of light at 3.00 \times 10^{8}\;\text{m}\cdot\text{s}^{-1} in vacuum.

f = \dfrac{c}{\lambda}

where

  • f is the frequency of the electromagnetic radiation,
  • c is the speed of light, and
  • \lambda is the wavelength of the radiation.

(a)

Convert all units to standard ones.

\lambda = 0.600\;\text{pm} = 0.600 \times 10^{-12} \;\text{m}.

The unit of f shall also be standard.

f = \dfrac{c}{\lambda} = \dfrac{3.00\times 10^{8}\;\text{m}\cdot\text{s}^{-1}}{0.600\times 10^{12}\;\text{m}} = 5.00 \times 10^{20}\;\text{s}^{-1}= 5.00\times 10^{20}\;\text{Hz}.

For each particle,

E = h\cdot f,

where

  • E is the energy of the particle,
  • h is the planck's constant where h = 6.63\times 10^{-34}\;\text{J}\cdot\text{s}^{-1}, and
  • f is the frequency of the particle.

E = h \cdot f = 6.63\times10^{-34}\;\text{J}\cdot\text{s}\times 5.00\times 10^{20}\;\text{s}^{-1} = 3.32\times10^{-13}\;\text{J}.

(b)

Try the steps in (a) for this beam of microwave with

  • \lambda = 2.50 \;\text{cm} = 2.50\times 10^{-2}\;\text{m}.

Expect the following results:

  • f = 1.20\times 10^{10}\;\text{Hz}, and
  • E = 7.96\times 10^{-24}\;\text{J}.
4 0
3 years ago
For the following compound, determine each element and if the element is a metal or nonmetal. Also determine if the compound has
Artyom0805 [142]
NaCl - also known as sodium chloride or table salt; an ionic bond; it’s a chemical compound, so both
SO2 - also known as sulfur dioxide; a covalent bond; nonmetal
CaO - also known as calcium oxide; an ionic bond; metal
HF - also known as hydrogen fluoride; polar covalent; metal
NO2 - also known as nitrogen dioxide; covalent; nonmetal
H2O - also known as water; covalent; nonmetal
4 0
3 years ago
Describe the celestial object in the image. The object is called a because it is producing and has not yet .
svlad2 [7]

The image, blanks and options are  missing in the question. So the image is attached below and the complete question is:

Describe the celestial object in the image.

The object is called________ a because it is producing _______ and has not yet ________ .

First Blank: A.Meteor B.Meteorite C.Meteoroid

Second Blank: A. a streak of light B. An orange Horizon C. A star- Filled sky

Third Blank: A. Reached earths atmosphere B. Struck Earth C. Completed an orbit

Answer:

First Blank - A. Meteor

Second Blank - A. a streak of light

Third Blank -  A. Reached earths atmosphere

Explanation:

The given image shows celestial object called meteor.

The meteor is often called shooting star as it produces a streak of light. When a meteoroid reaches Earth's atmosphere, it experiences a friction which allows the meteoroid to burn up and produce a streak of light in the sky.

Hence, the correct answer for blanks is Meteor, a streak of light and Reached earths atmosphere.

3 0
3 years ago
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