On the Periodic Table, which elements are predominantly (mostly) gases with low densities?
Alkali Metals,
Metalloids
Transition Metals
Non-Metals
Which color of visible light would have the least energy? Which color of visible light would have the most energy?
Answer:
Red is the lowest.
Explanation:
Suppose you crushed an antacid tablet before dissolving it in a glass of water. The crushed antacid tablet would:
a. take the same amount of time to dissolve as a whole antacid tablet.
b. dissolve more slowly than a whole antacid tablet.
c. take more time to dissolve than a whole antacid tablet.
d. dissolve more quickly than a whole antacid tablet.
Explanation:
dissolve more quickly than a whole antacid tablet.
Why is nitrogen more electronegative than lithium
A chlorine concentrations of 0.500 ppm is desired for water purification. What mass of chlorine must be added to 2500 L of water to achieve this level?
Answer:
50g
Explanation:
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How many kJ are 3,340J?
options:
3,340,000 kJ
334,000 kJ
3.340 kJ
33.40 kJ
If one mole of nitrogen is used how many liters of hydrogen are needed
Answer:
300
Explanation:
Can y’all please help me this is due tomorrow
Answer:
1,crust
2, mesosphere
3,Inner core
4,Outer core
5, Mantle
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the amount of mass in a given space
What might be a possible outcome if you left a soda in a glass bottle in the freezer for a very long time?
A.
The gases in the soda will increase in volume as the soda transitions from liquid to solid. This will cause the bottle to explode.
B.
The gases in the soda will decrease in volume as the soda transitions from liquid to solid. This will cause the bottle to implode or collapse.
C.
H2O will decrease in volume when transitioning from a liquid to solid state. This will cause the bottle to implode or collapse.
D.
H2O will increase in volume when transitioning from a liquid to solid state. This will cause the bottle to explode.
A the soda will increase in volume
In your opinion,what will happen to a person who has sustained injury in the spinal cord?
Answer: I think they get will paralysed and some of the impulses may not be able to get through.
Fill in the two blanks
Answer:
A.) Longer and Shorter
Explanation:
If the wavelength of a light wave is shorter that means the frequency will be higher.
That means that longer wavelengths have a lower frequency.
The Plimsoll mark is placed on the side of all large commercial ships. After
reading this article and looking at the modern Plimsoll mark, why do you
think there are so many different marks for water at different levels?
Relative formula mass of carbon manoxide
Explanation:
The relative formula mass of a substance, shown in grams, is called one mole of that substance. So one mole of carbon monoxide has a mass of 28 g, and one mole of sodium oxide has a mass of 62 g
Answer:
M(CO)=28 (g/mol)
Explanation:
M= 12+16=28 (g/mol)
Cu2(s)+O2(g)=Cu2O(g)+SO2(g)
please help urgent will give brainiest
Answer:
2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2
Explanation:
2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2
Is temperature and pressure directly proportional or inversely proportional?
A. Inversely proportional
B. Directly proportional
Where is the potential energy to run the plant?
A 3
B
4
С
1
D
2
Answer: C
Explanation:
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6. Which of the following is not a characteristic of electromagnetic light waves?
O A. They can be reflected and refracted.
O B. They travel at the same speed through any one material.
O C. They can't travel through a vacuum.
O D. They obey the formula velocity = wavelength x frequency
Answer:
B. They travel at the same speed through any one material.
Explanation:
Which sets of elements have similar chemical and physical properties?
1. Mg and Ra 2. Al and P 3. Be and Ba 4. Na and Cl
1 & 2 ,
2 & 3
1 & 3
2 & 4
Answer:
1 & 3
Explanation:
Elements have similar chemical and physical properties if and only if they belong to the same group of elements in the periodic table.
A group of elements in the periodic table is a family of elements, the elements in the in the same group have the same number of valence electrons in their outermost shell, share similar chemical reactivity (with slight variation within the group) and similar physical properties (with slight variation within the group).
Magnesium, radium, beryllium and barium all belong to group 2 hence they have similar chemical and physical properties.
Please help please with the answers
1) We know that rtp = number of moles × 24
= 0.25 × 24
= 6 dm³
Therefore the volume of 0.25 moles of gas at rtp is A) 6 dm³
3.1) Amount of Copper = 20 tonnes
Amount of pure copper from impure copper = 18 tonnes
Purity of copper = (Pure copper/ impure copper) × 100
= (18 / 20) × 100
= 18 × 5
= 90 %
Therefore the purity of copper is 90%
3.2) We know that oxygen has 8 protons and 8 neutrons, so the weight of oxygen molecule is 8 + 8 = 16 u
So, one mole of oxygen weighs 16 g, so 2 moles weigh 2 × 16 = 32 grams
But oxygen is diatomic so the weight is 32 × 2 = 64 grams
Therefore the weight of 2 moles of oxygen is 64 grams
3.3) Concentration of solution = Amount of solute/volume
= 4 moles/ 2 dm³
= 4 / 2
= 2 mol/dm³
Therefore the concentration of a solution containing 4 moles in 2 dm³ of solution is 2 mol/dm³
Happy to help :)
If you need any more help, fell free to ask
Extremely sorry for the late answer
Which of the following is a difference between transition metals and halogens?
Transition metals are better at rock n roll
Transition metals are better at rock n roll,
Transition metals contain liquids while halogens are good insulators
Transition metals contain liquids while halogens are good insulators
Transition metals conduct electricity while halogens are reactive non-metals
Transition metals conduct electricity while halogens are reactive non-metals
Transition metals are poor conductors of electricity, while halogens have high densities
how does pentene become pentane?
How does propene become propane?
is there a relationship between CO2 levels in average global temperatures
Answer:
Yes
Explanation:
A small part of the correspondence is due to the relationship between temperature and the solubility of carbon dioxide in the surface ocean, but the majority of the correspondence is consistent with a feedback between carbon dioxide and climate.
What is the number of moles of H2 produced when 23 g of sodium react with water according to the equation 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)
Answer:
0.5 mole of H₂.
Explanation:
We'll begin by calculating the number of mole in 23 g of Na. This can be obtained as follow:
Mass of Na = 23 g
Molar mass of Na = 23 g/mol
Mole of Na =?
Mole = mass / Molar mass
Mole of Na = 23 / 23
Mole of Na = 1 mole
Next, the balanced equation for the reaction.
2Na + 2H₂O —> 2NaOH + H₂
From the balanced equation above,
2 moles of Na reacted to produce 1 mole H₂.
Finally, we shall determine the number of mole of H₂ produced by the reaction of 23 g (i.e 1 mole) of Na. This can be obtained as follow:
From the balanced equation above,
2 moles of Na reacted to produce 1 mole H₂.
Therefore, 1 mole of Na will react to produce = (1 × 1) / 2 = 0.5 mole of H₂.
Thus, 0.5 mole of H₂ is obtained from the reaction.
Is the following reaction balanced or unbalanced?
2Fe2O3 + 3C → 4Fe + 3CO2
Answer:
unbalanced
hope this helps
I need help...
I need a lab conclusion on acids and bases.
Acids are proton donors, whereas bases are proton recievers. The more positive the charge on an atom, the higher its acidity. More concentrated electrons = more stable base = weaker acid. But electronegativity = more concentrated electrons. And electronegativity = stronger acid.
How many moles are in 1.7 x 10^50 particles of Al?
2.8 × 10²⁶ moles Al
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
MolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 1.7 × 10⁵⁰ particles Al
[Solve] moles Al
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.7 \cdot 10^{50} \ particles \ Al(\frac{1 \ mol \ Al}{6.022 \cdot 10^{23} \ particles \ Al})[/tex][DA] Divide [Cancel out units]: [tex]\displaystyle 2.82298 \cdot 10^{26} \ moles \ Al[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
2.82298 × 10²⁶ moles Al ≈ 2.8 × 10²⁶ moles Al
How do the ideas of electrolytes and IV fluids relate?
Answer:
Electrolytes, particularly sodium, help the body maintain normal fluid levels in the fluid compartments because the amount of fluid a compartment contains depends on the amount (concentration) of electrolytes in it. If the electrolyte concentration is high, fluid moves into that compartment (a process called osmosis).
Explanation:
Answer:
Electrolytes are minerals in your body that have an electric charge. They are in your blood, urine, tissues, and other body fluids. Electrolytes are important because they help
Balance the amount of water in your body
Balance your body's acid/base (pH) level
Move nutrients into your cells
Move wastes out of your cells
Make sure that your nerves, muscles, the heart, and the brain work the way they should
Sodium, calcium, potassium, chloride, phosphate, and magnesium are all electrolytes. You get them from the foods you eat and the fluids you drink.
The levels of electrolytes in your body can become too low or too high. This can happen when the amount of water in your body changes. The amount of water that you take in should equal the amount you lose. If something upsets this balance, you may have too little water (dehydration) or too much water (overhydration). Some medicines, vomiting, diarrhea, sweating, and liver or kidney problems can all upset your water balance.
Treatment helps you to manage the imbalance. It also involves identifying and treating what caused the imbalance.
hope it's help you plz mark as brain listPeople are attempting to conserve natural resources, such as oil, gold, and aquifers because they are non-renewable resources. Why can't these resources be replaced?
Answer:
Natural resources are the resources that are available in the nature. There is no human involvement in the production or manufacture of the natural resources. These resources helps in adding capital and growth to the development of the country. Natural resources are found in abundance but they are non-renewable resources. This means that it takes millions of years for their formation. Once exhausted, their replacement would became very difficult. Conversation of the natural resources has been one of the global action. Developed nations are equipped to find ways by which natural resources can be saved and used in a way that they do not extinguish. Many alternative methods and techniques have been adopted to preserve them. Natural resources like oil, gold and coal are performed after going through a process of many years. Hence, there replacement becomes very challenging and difficult respectively.
The element with the most stable electron configuration shown below would be___
a) Magnesium
b) Oxygen
c) Argon
d) Carbon
