Answer:
A. two atoms of the element from the first column and one atom of the element from the sixteenth column.
Explanation:
If an ionic compound formed between an element from the first column of the periodic table and another from the sixteenth column, you would expect the compound to include two atoms of the element from the first column and one atom of the element from the sixteenth column.
The periodic table is arranged in rows and columns. The rows are periods while the columns are groups.
The first column of the periodic table contains elements that form univalent ions hence they have a valency of 1. The elements in the sixteenth column usually form divalent negative ions and have a valency of 2.
An example of an element of the first column is sodium while an example of an element of the sixteenth column is sulphur.
During ionic bond formation, there is an exchange of valency such that the formula of a compound formed between sodium and sulphur is Na2S.
Therefore, when an ionic compound formed between an element from the first column of the periodic table and another from the sixteenth column, you would expect the compound to include two atoms of the element from the first column and one atom of the element from the sixteenth column.
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most bacteria are ___ as they are unable to make their own food
Answer:
HETEROTROPHIC
Explanation:
Based on nutrition, organisms are classified into autotrophic and heterotrophic. Autotrophic organisms are organisms that are capable of making their own food using either light source (photosynthesis) e.g plants or chemical source (chemosynthesis) e.g some bacteria.
Contrarily, HETEROTROPHIC organisms are those that are unable to synthesize their own food themselves, hence, they rely on other organisms for their energy source. Types of heterotrophism include; saprophytism, predation etc. Most bacteria falls under this heterotrophic category because they are unable to make their own food.
give two areas where the compressible nature of gas is applied
Answer:
1. Gases can be easily liquefied into very small volumes and stored in liquid form Eg in LPGA cylinders and used in homes.
2. Balloons can be easily filled with air.
The fact that a gas is easily compressible is applied in the colling devices such as air conditioners as well as in the pumping of tyres with air.
Are gases compressible?Gases are easily compressible because they do not have a definite volume. This is positively applied in many areas of life.
The fact that a gas is easily compressible is applied in the colling devices such as air conditioners as well as in the pumping of tyres with air.
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is Copper(II) hydroxide ionic
A compound has the empirical formula C2H40, and its formula mass is 88
g. What is the subscript for oxygen in the molecular formula? *
Answer:
2
Explanation:
The molecular formula can be derived from the empirical formula of a compound and the molecular mass as follows:
(C2H4O)n = 88g/mol
Where;
C = 12, H = 1, O = 16
{12(2) + 1(4) + 16}n = 88g/mol
{24 + 4 + 16}n = 88
(44)n = 88
44n = 88
Divide both sides by 44
n = 88/44
n = 2
The molecular formula is: (C2H4O)n
= (C2H4O)2
= C4H8O2
According to the question asked, oxygen has a subscript of 2 in the molecular formula.
The .......................................................... Is related to its tendency to give away electrons and form positive ions
Answer:
electropositivity or metallic character.
The ability of an atom to give away electrons and form positive ions i.e cations is known as electropositivity or metallic character.
What is the best description of what has happened to flowers when they change color as they mature?
A. a physical reaction
B. a chemical reaction
C. a formation of a mixture
PLSSS HELP MEEE
Answer:
The answer is (A)
Explanation:
When the weather changes, nature also changes because most plants rely on photosynthesis and if they don't get as much light then they can't support as much as they used causing them to shut down parts of the plant.
What happens to the amount of energy as it flows up the food chain
Answer:
It decreases because animals only get 10% of the energy they eat.
Explanation:
How many atoms are in 2.76 moles of water?
Which process uses the least amount of material to create electricity, coal or uranium, coal or nuclear power plant?
Answer:
nuclear power plant
Explanation:
Generation of electricity often involves the use of some kind of material or energy that is consumed as electricity is generated. There are various ways of generating electricity such as;
By burning coal
Use of a radioactive element as nuclear fuel
From wind energy
From water
From the sun, etc
Each process involves the intake of material or energy. The process that goes on in a nuclear power plant requires a radioactive fuel of which uranium is an example.
A nuclear plant uses the least amount of material (such as only 1g of uranium fuel) in electricity generation compared to the tons of coal burnt in order to generate electricity.
A student need to predict the mass of a block of aluminum. The block is 4.23 cm on all sides and the density of aluminum is 2.7 g/cm3. What will the mass of the block be?
A ring of pure gold has a mass of 17.3 grams. How many atoms of gold are in the ring?
Answer:
5.29936 x 10^23 atoms
Explanation:
To do this, we need to find the number of moles in the ring so that we can then multiply that by Avogadro's number (6.022×10^23).
equation for finding moles: [tex]n = \frac{mass}{M_{r} }[/tex]
substitute in the known values: [tex]n = \frac{17.3}{197 }[/tex]
divide to find the value of n: 0.088 mol
Multiply by Avogadro's constant: 0.088 x 6.022 x 10^23
= 5.29936 x 10^23 atoms in the ring.
hope this helps!
According to Avogadro's number, there are 5.289×10²² atoms of gold in 17.3 grams of ring.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
In the given problem, number of atoms of gold is found out as, number of atoms=17.3/196.966×6.022×10²³=5.289×10²² atoms.
Thus, there are 5.289×10²² atoms of gold in the ring.
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In molecular oxygen (O=O) which atom is partially positive?
the oxygen atom
Explanation:
Water is a molecular compound consisting of polar molecules that have a bent shape. The oxygen atom acquires a partial negative charge while the hydrogen atom acquires a partial positive charge.
Answer:
Carbon
Explanation:
oxygen is more electronegative than carbon, the electrons will spend more time around the oxygen atom giving it a partially negative charge while the carbon will become partially positive. Some atoms retain lone (unbonded) pairs of electrons when they are part of a covalent complex.
What can air pollutants do?
Answer:
Air pollution can also cause headaches, dizziness, and nausea. ... Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs.
Explanation:
Write the following number correct to 2 significant figures: 3644000
Hurry Plz NO TIME!!!
A solution has a concentration of 40 g.L-1
. We take 20 mL of this solution and add water. The
final volume is 40 mL. What's the new concentration? No calculations but you need to
justify
Answer: The new concentration is 20 g/L
Explanation:
According to the dilution law,
[tex]C_1V_1=C_2V_2[/tex]
where,
[tex]C_1[/tex] = concentration of stock solution = 40 g/L
[tex]V_1[/tex] = volume of stock solution = 20 ml = 0.02 L
[tex]C_2[/tex] = concentration of diluted solution= ?
[tex]V_2[/tex] = volume of diluted solution= 40 ml = 0.04 L
[tex]40g/L\times 0.02L=C_2\times 0.04L[/tex]
[tex]C_2=20g/L[/tex]
Thus new concentration is 20 g/L
A compound that releases hydroxide ions in solution would most likely have which chemical property? 1.It would react with lipids to form soap. 2.It would react with metals to form a salt and water. 3.It would react with metals to form hydrogen gas. 4.It would react with carbonates to form carbon dioxide.
Answer:
1
Explanation: bases do not react with metals or carbonates
Answer:
A
Explanation:
I did the test and that's the correct answer
What happens to the pitch when the frequency of a sound wave decrease?
A it stays the same
B it decreases by that same amount
C it increases twice the amount
D it increases by the same amount
Answer:
B
Explanation:
Pitch is determined by frequency. So if frequency increases, pitch increases and produces a higher sound. If frequency decreases, pitch decreases and produces a lower sound. Frequency and wavelength are inversely related, meaning that if frequency increases, wavelength becomes shorter and vice versa
sulfric acid has the chemical formula H2SO. A certain quantity of sulfuric acid contains 4.89 x 10^25 atoms of oxygen. How many moles of sulfuric acid is in the sample?
Answer:
nsjsjdnsbsbsbhsbsndbxjxjdjdjxjskjxjsksjsjshsjsnjssjsk
Which is true of synthesis and decomposition reactions
Complete question is;
What is true of synthesis and decomposition reactions?
A) Synthesis reactions require more energy than decomposition reactions.
B) Synthesis reactions produce more products than decomposition reactions.
C) Synthesis reactions are the opposite of decomposition reactions.
D) Synthesis reactions have fewer reactants than decomposition reactions.
Answer:
C) Synthesis reactions are the opposite of decomposition reactions.
Explanation:
Correct answer is option C. This is because, Synthesis reactions are defined as those whereby substances are combined together to form larger molecules/compounds. Whereas, decomposition reactions are the opposite due to the fact that they involve the breakdown of two or more substances.
The diagram indicates that the tilt of Earth's axis and Earth's revolution around the Sun cause
Earth to experience ?
Answer:
G.day and night
sorry if it is wrong!
An airplane travels 200 km/h in 4 hours going to Zambales. What will be the distance and displacement?
Answer:
See explanation
Explanation:
Recall that;
Speed = Distance/time
Distance = Speed * time
Speed = 200 km/h
Time = 4 hours
Distance = 200 km/h * 4 hours = 800 kilometres
Displacement has to do with distance covered in a specified direction, in this case, the direction is towards Zambales.
Hence, the displacement is 800 kilometres towards Zambales.
volume of 5.2 X 10^26 molecules of CH4
Answer:
19348.84 L
Explanation:
At STP, we know that;
6.02 × 10^(23) molecules = 22.4 L
Therefore, 5.2 × 10^(26) molecules = 5.2 × 10^(26) × 22.4/(6.02 × 10^(23)) = 19348.84 L
Thus, volume of CH4 with 5.2 X 10^26 molecules is 19348.84 L
Is sodium sulfide a ionic or covalent
Answer:
I would say iconic
Explanation:
please correct me if i am wrong
Sodium sulfide compound is an ionic compound. There are 2 Na atoms per 1 Sulfide atom.
Ions with opposing charges are created in ionic compounds when metal atoms transfer electrons to nonmetal atoms. Sodium gives one electron to sulphur in the case of sodium sulphide, resulting in the formation of positively charged sodium ions (Na+) and negatively charged sulphide ions (S2-). The complex is held together in a lattice structure by the electrostatic attraction between these ion pairs with opposing charges. Sodium sulfide's high melting and boiling temperatures, as well as its capacity to conduct electricity when melted or dissolved in water, are indications of its ionic nature.
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What is the correct order for the seasons of winter, spring, summer, and fall in the Northern
Hemisphere?
Answer:
Therefore, for temperate areas in the northern hemisphere, spring begins on 1 March, summer on 1 June, autumn on 1 September, and winter on 1 December. For the southern hemisphere temperate zone, spring begins on 1 September, summer on 1 December, autumn on 1 March, and winter on 1 June.
Explanation:
The correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
What is season?A season is a subdivision of the calendar year based on variations in the local climate, ecology, and amount of daylight hours. The axial parallel of Earth's inclinator orbit of the Sun causes seasons on Earth.
Seasons are distinguished by differences in the amount of sunlight reaching Earth's surface in temperate as well as polar areas. These fluctuations may lead certain animals to migrate or go into hibernation while others may cause vegetation to fall dormant. The correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
Therefore, the correct order for the seasons of winter, spring, summer, and fall in the Northern Hemisphere is summer, spring and winter.
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lithium sulphate is used in some medicines and its presence in a medicine can be shown by two a combination of two tests a)explain how a flame test could help in this context
b) Describe how you would test a solution of the medicine for the presence of sulphate ions.
C) write a balanced chemical equation, including state symbols, for the reaction occurring in B)
Answer:
A flame test could help by seeing what things it could catch on fire from or the things that could happen with acids etc. I would test the medicine by asking someone who has had it in their life, asking doctors or I would maybe use it myself maybe. (I don’t know about c, sooo sorry)
How is a chemical equation different from a chemical formula?
Answer:
Explanation:
A chemical formula is the combination of atomic symbols that designate a particular chemical compound, or a substance with two or more different elements. The formula shows which type and how many of each element makes up that specific compound
Organisms with traits best suited to their environment, survive during what process?
A. environmental change
B. natural selection
C. populations
D. theories
Answer: According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
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Hi, I really need help, my mental health is horrible right now and I can’t do any work, and I really just need help answering these questions because I really don’t want to get bad marks but I don’t have the motivation to do anything, thanks so much!
Can someone please help me with the with this
Answer:
Chemical
Explanation:
When you name a binary compound, you have to add____ to the ending of the second element in the compound.
A) -ate
B) -ide
Answer:
B - ide
Explanation: