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Yuri [45]
3 years ago
9

Name given to the type of microscope that only has one lens.

Chemistry
1 answer:
NeTakaya3 years ago
8 0

Answer:

simple microscope has only one lens

:)

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What does atomic mass on the periodic table represent?
neonofarm [45]
The atomic mass on the periodic table represents the sum of number of protons and number of neutrons.

Atomic mass = Number of protons + number of neutrons

Hope this helps!
6 0
3 years ago
What does the t cell do to your body?
lawyer [7]

Answer:  it's part of the immune system that focuses on specific foreign particles. Rather than generically attack any antigens, T cells circulate until they encounter their specific antigen. As such, T cells play a critical part in immunity to foreign substances !

Explanation:

4 0
3 years ago
3) In the reaction below, how many grams of carbon dioxide are produced when iron III
Yanka [14]
<h3>Answer:</h3>

132.03 g

<h3>Explanation:</h3>

<u>We are given;</u>

  • The equation for the reaction as;

Fe₂O₃ + 3CO → 2Fe + 3CO₂

  • Molar masses of CO and CO₂ as 28.01 g/mol and 44.01 g/mol respectively
  • Mass of CO as 84 grams

We are required to calculate the mass of CO₂ that will produced.

<h3>Step 1: Calculate the number of moles of CO</h3>

Moles = Mass ÷ Molar mass

Molar mass of CO = 28.01 g/mol

Therefore;

Moles of CO = 84 g ÷ 28.01 g/mol

                     = 2.9989 moles

                    = 3.0 moles

<h3>Step 2: Calculate the number of moles of CO₂</h3>
  • From the reaction, 3 moles of CO reacts to produce 3 moles of CO₂
  • Therefore; the mole ratio of CO to CO₂ is 1 : 1
  • Hence; Moles of CO = Moles of CO₂

Moles of CO₂ = 3.0 Moles

But; mass = Moles × molar mass

Thus, mass of CO₂ = 3.0 moles × 44.01 g/mol

                                = 132.03 g

Hence, the mass of CO₂ produced from the reaction is 132.03 g

3 0
3 years ago
A sample of dinitrogen tetroxide (N204) gas occupies 144 L at STP. How many moles of nitrogen atoms are present in this sample?​
denis23 [38]

Answer:

Molecular (gas and liquid) Edit

Its gas can be easily obtained by heating liquid nitrogen and allowing it to evaporate. It has a wide range of uses and can be used instead of air in environments where oxidation is not desired:

to preserve the freshness of packaged foods,

to cover liquid explosives for safety purposes,

In the production of electronic components such as transistors, diodes and integrated circuits,

in the production of stainless steel,

For filling automobile and aircraft wheels due to its inert, moisture-free and non-oxidizing properties.

It is produced industrially and in large quantities by distillation from liquefied air and although it is defined as LN2, the correct spelling is NO2 (1). It is a freezing liquid and if it comes into contact with living tissue, it causes sudden freezing. If properly isolated from ambient temperature, it creates a source of nitrogen gas that does not require pressure. The ability of water to stay at temperatures well below freezing (77 K, -196 ° C or -320 ° F) makes it possible to use liquid nitrogen in many different areas:

freezing and transporting food products by dipping,

Preservation of living tissues, reproductive cells (sperm, eggs) and other biological samples and materials by freezing,

in visual experiments in science education,

as a heatsink in high sensitivity sensors and low noise amplifiers,

in dermatology. removing unpleasant looking warts or skin wounds with potential cancer risk,

As a cooler in cooling systems of computer hardware such as CPU or GPU.

Edit Acquisition

Nitrogen can be obtained in pure form by the decomposition of sodium acid (NaN3) and ammonium dichromate:

NaN3 → 2Na + 3N2 (300 ° C)

(NH4) 2Cr2O7 → N2 + Cr2O3 + 4H2O

Another method used in obtaining nitrogen is the reaction of ammonia with lime cream:

2NH3 + 3Ca (OCl) → 3CaCl3 + N2 + 3H2O

Edit Precautions

Nitrate fertilizers are dragged by irrigation water of cultivated lands and mixed with rivers and groundwater, causing great pollution. Compounds containing cyano (-CN) form extremely toxic salts and are lethal to all mammals.

Explanation:

4 0
3 years ago
In two or more complete sentences describe how atomic radius changes as you move down a group in the periodic table and why.
FrozenT [24]

in two of they got harder

8 0
3 years ago
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