Answer:
Zacharias Janssen
Explanation:
Zacharias Janssen is known as the man who invented the compound microscope which is widely used today by most scientists all over the world.
The compound microscope was built in the 16th century during this period eyeglasses were just being introduceed to people all around.
Zacharias Jensen achieved this great feat with the help of his father Hans who was also anther great scientist, he mentored his son throughout the years and gave him the necessary skills and knowledge to produce the compound microscope.
why do non-metal aroms form covalent bonds e.g. H2O
Answer:
Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom. ... Covalent compounds tend to be soft, and have relatively low melting and boiling points.
Rank the following 3rd period atoms in order of increasing force of attraction on its respective electrons.
Sodium, silicon, magnesium, sulfur, argon
A. argon, sulfur, silicon, magnesium, sodium
B. sodium, magnesium, silicon, sulfur, argon
C. sulfur, silicon, argon, sodium, magnesium
D. argon, silicon, magnesium, sulfur, sodium
Answer:
B
that's all HAHA why do it have to be 20 characters to answerrr
Which of the following are properties of the oxides of non-
metals?
property 1
property 2
A
acidic
covalent
B.
acidic
ionic
С
basic
covalent
D
basic
ionic
(a)
(b)
(d)
Answer:
it is option A hope it helps
The properties of nonmetallic oxides include acidity and covalent character. Hence, option A is correct.
What are non-metals?Non - metals are elements in the rightmost side of the periodic table. Non -metals are mostly gases and some of them include, metalloids also. Non-metals are commonly electron -deficient and some of them are highly electronegative.
A compound shows covalent character, if the electrons are shared between the constituent atoms. Covalency increases from left to right in periodic table.
As the covalent character increases, acidity increases. Oxides of non-metals are electrophiles and acts as Lewis acids. They are all covalent compounds. Therefore, option A is correct.
Find more on covalent bonding:
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Describe how an electric field is generated.
Answer:
Electric charges produce electric fields
Explanation:
By counting the number of crests that pass by a given point in a set amount of time, what you would be calculating?
Answer:
Frequency
Explanation:
When we talk about crests, we are referring to the high points of a wave.
We measure wave frequency by counting out the the number of crests (or high points) of a given wave that pass by a given point in a set amount of time. Thus, the higher the number of crests, the greater the frequency of the wave and vice versa.
We define the frequency of a wave as the number of waves that passes by a fixed point within a given period of time.
Describe what happens when two bodies of matter at different temperatures are brought together.
Answer:
maybe they will be the same temperature
Explanation:
Answer: The effect of this transfer of energy usually, but not always, is an increase in the temperature of the colder body and a decrease in the temperature of the hotter body.
Explanation:
What is the main purpose of the nervous system?
A:exchanges gases between the body and the environment
B: gathers information from the environment and body and coordinates actions
C: regulates the body using hormones
D: provides shape and structure for the body
Answer:
B
Explanation:
the nervous system (nerves) is the brains communication to the body
7
When one kind of cell changes to a specialized cell, this is an example of ... (S
Answer:
Cellular differentiation
Explanation:
Answer:
cellular differentiation
Explanation:
For the reaction H2 + O2→ H2O, how many grams of water are produced from 6.00 mol of hydrogen?
Answer:
108 g
Explanation:
2H₂ + O₂ ⇒ 2H₂O
1) n(H₂) : n(H₂O) = 2 : 2
Hence, n(H₂O) = n(H₂) = 6,00 mol
2) m(H₂O) = n × M = 6,00 mol × (2 + 16) g/mol = 6,00 × 18 mol = 108 g
What are the three energy's .
Answer:
Energy and how it can change forms. Kinetic, potential, and chemical energy.
I NEED THIS ASAPP PLEASEE
Answer:
Exothermic
Explanation:
The equation of the reaction is given as;
H₂O(vapour) --> H₂O(liquid)
The equation above represents a condensation process. Water vapour condenses to liquid.
Condensation involves loss of energy as heat. The equation can be modifies as;
H₂O(vapour) --> H₂O(liquid) + Heat
Due to the loss of heat, condensation is regarded mas an exotheric process.
Complete the following reaction :
HC≡CH + HBr→?
hope it helps you .............
Calculate the number of moles in 2.67 g of carbon trihydride
Answer:0.178 moles
Explanation: carbon trihydride seems to be an unusual name for the methyl group CH3–
ionic wt 15
moles = 2.67/15 = 0.178
Two oxides, X and Y, are added separately to dilute sulfuric acid and Giste sesiun toycrolide,
X reacts with dilute sulfuric acid but y does not react,
Y reacts with aqueous sodium hydroxide butx does not reach.
Which type of oxide are X and Y?
Answer:
x basic and y acidic
Explanation:
hope it helps
13.) Write one paragraph minimum of 6 sentences addressing your concerns or lack of concern about DHMO.
Answer:
I am not sure
Explanation:
ΔABC ~ ΔEFD
What are some of the positive and
negative effects of the use of plastics?
Answer:
Positive: Save fuel and reduces greenhouse gas
Negative: Harmful to human and animal health ( underwater animals), Hurts the food chain
Explanation:
I got it from a video. Hopefully it helps you.
Where is the air pressure greater-- at sea level or on a mountaintop? Explain
Answer:
Air pressure is greater at sea level than at the top of a mountain. The amount of air at sea level is greater than that on top of a mountain.
Explanation:
Please give thanks to all my answers and please mark as brilliant and please follow me
How many moles are in 5.025 grams of NaOH?
Answer:
The SI base unit for amount of substance is the mole. 1 grams NaOH is equal to 0.025001806380511 mole.
Answer:
0.025001806380511 mole.
Explanation:
The SI base unit for amount of substance is the mole. 1 grams NaOH is equal to 0.025001806380511 mole.
(a) Describe how a simple molecular structure differs from a giant molecular structure.
Answer:
Giant structures are usually arranged in to giant regular lattices and they are extremely strong because they have many bonds involved. Simple molecules are just normal molecules as the name suggests like CO². though it contains strong covalent bond it still has weak intermolecular forces
Explanation: when your account gets to deleted and your trying to get your points up lol
Which compound is impossible?
A. Zns
B. Na2O
C. Ca3P2
D.LiCl2
1.25mole Nocl was placed in a2.50l reaction chamber at 427c. After equilibrium was reached .1.10moles of Nocl remained.Calculate the equilibrium constant Kc for the reaction. 2Nocl(g)=2No(g)+cl2(g)
Answer:
Kc → 5.58×10⁻⁴
Explanation:
Equilibrium reaction is:
2NOCl (g) ⇄ 2NO (g) + Cl₂(g)
Initially we have 1.25 moles of NOCl
After the equilibrium, we have 1.10 moles. So, during the process:
(1.25 mol - 1.1 mol) = 0.15 moles have reacted.
As ratio are 2:2, and 2:1, 0.15 moles of NO and (0.15 /2) = 0.075 moles of chlorine, were produced in the equilibrium.
Finally in equilibrium we have: 1.10 moles of NOCl, 0.15 moles of NO and 0.075 moles of Cl₂. But these amount are not molar, so we need molar concentration in order to determine Kc:
1.10 mol /2.50L = 0.44 M
0.15 mol / /2.50L = 0.06 M
0.075 mol /2.50L = 0.03 M
Let's make expression for Kc → [Cl₂] . [NO]² / [NOCl]²
Kc = (0.03 . 0.06²) / 0.44² → 5.58×10⁻⁴
write formulas and names for two binary ionic compounds
how does friction affect how tractors move in mud
Why can graphite be used as a lubricant
Anybody good at chemistry that is willing to help?? If you could that'd be greatly appreciated!
(25 PTS)
Answer:
The least similar to a real gas found in the environment would be B.
Explanation:
Standard Ambient Temperature/Pressure (SATP) is at 298.15K and 101.3kPa. It describes standard conditions and is often used for measuring gas density and volume using the Ideal Gas Law. The values least similar to theses ones would be the least similar in the gases in the environment.
Advertisements for tobacco and alcohol products work because they "tell the truth."
True
False
PLS HELP DECOD THIS :(
The planet Superman was born on (also has the atomic number 36): (F3) R (C3) P (H1) (I1) N
Answer:
he was born on planet krypton
ammonia gas cannot be collected in an erect gas jar?why?
Answer:
ammonia being lighter than air, is collected by downward displacement of air in an inverted gasjar
The gas jar is used to collect ammonia gas. This gas can be barely dissolved in water. As a result, the downward displacement of water does not gather it in the jar.
What is ammonia ?With the formula NH3, ammonia is a nitrogen and hydrogen inorganic chemical. Ammonia, the simplest pnictogen hydride and a stable binary hydride, is a colorless gas with a strong, pungent odor.
Because it is simpler to install inlets and outlets in one end of an erect gas jar than it is to install them on the side or the bottom, which are required for placement on a stable surface.
Ammonia is prepared in a laboratory by forcing air downward to collect the gas. Due to the high solubility of ammonia in water, it is impossible to collect ammonia gas over water.
Thus, The gas jar is used to collect ammonia gas.
To learn more about ammonia, follow the link;
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how many molecules are in 4K2CO3
Answer: 5 molecules
Explanation:
2 molecules of K and 3 molecules of O
PLEASE HELP WILL GIVE BRAINLIEST
2 eggs cook in a frying pan, which is sitting over a gas burner.
Is thermal energy being transferred by radiation in this image? Why or why not?
Answer:
No, thermal energy is not being transferred by radiation. The eggs are in direct contact with the metal pan, which is in direct contact with the gas flame, so this is conduction, not radiation. Radiation transfers thermal energy by electromagnetic waves, not by direct contact.
Answer:
no
Explanation:
a metal pan is cooking the eggs because the flame is touching the pan and the molecules are colliding with each other