What type of shape do solids have?
hope it helps :-). good morning.
A substance is tested and has a pH of 8.4. What would you classify it as?
A. A strong acid
B. A strong base
C. A weak acid
D. A weak base
Answer:
D
Explanation:
7 is neutral on a PH scale. Anything less is an acid and anything higher is a base. A Ph scale goes from 1-13. 8.4-7=1.4. This is a small change so it is considered a weak base. Can I get brainliest?
Answer:
D.A weak base
Explanation:
The pH of a weak base falls somewhere between 7 and 10. Like weak acids, weak bases do not undergo complete dissociation; instead, their ionization is a two-way reaction with a definite equilibrium point. While strong bases release hydroxide ions via dissociation, weak bases generate hydroxide ions by reacting with water. Ammonia (NH3) and methylamine (CH3NH2) are examples of weak bases.
Calculate the mass of 488 moles of calcium carbonate, CaCO3
Help please!
Answer:
≅ 4.88 grams (3 sig. figs.)
Explanation:
to convert from ...
grams to moles => divide by formula wt.
moles to grams => multiply by formula wt.
this problem:
mass in grams = 488moles / 100.09g/mol = 4.875612 grams (calculator)
≅ 4.88 grams (3 sig. figs.)
1. How many mg of lithium phosphide are in 18.0 mL of a 1.25 M solution?
Answer:
1160mg
Explanation:
Molarity = number of moles ÷ volume
According to the information in the question, molarity = 1.25 M, volume = 18.0 mL = 18/1000 = 0.018L
M = n/V
n = M × V
n = 1.25 × 0.018
n = 0.0225moles.
Using mole = mass/molar mass, to find the mass of lithium phosphide (Li3P)
Molar mass of Li3P = 6.9(3) + 31 = 51.7g/mol
mole = mass/molar mass
0.0225 = mass/51.7
mass = 1.16grams.
In milligrams (mg), mass of Li3P = 1.16 × 1000 = 1160mg
How many moles are in 7.777x 10^24 molecules of Mg2. Watch your significant
figures
Answer:
12.91 moles of Mg₂, 8.4x10²⁴ atoms of I.
Explanation:
The number of molecules of any chemical substance is converted to moles using Avogadro's number (That is 6.022x10²³ molecules / mol) :
7.777x10²⁴ molecules * (1mol / 6.022x10²³molecules) =
12.91 moles of Mg₂As you can see, there are 4 significant figures in the number of molecules and the answer of moles.
In the same way, 14 moles of I are:
14 moles I * (6.022x10²³ atoms / mol) =
8.4x10²⁴ atoms of IWhat types of matter consist of particles that are highly organized?
Answer: Solids
Explanation:
Solids have a definite volume and structure. These are comprised of atoms, ions, and molecules closely packed together giving a confined structure to the solids. The particles are bound with strong force of attraction. The particles in the solid are arranged in an repeated, orderly, and three dimensional pattern. Depending upon the substance of the solid the particles within the solid can be ions, atoms, and can be molecules.
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What impact can wetlands reducing flood do to future generations?
Answer:
Wetlands prevent flooding by temporarily storing and slowly releasing stormwater. Wetlands also reduce water flow, thus allowing sediments and associated pollutants to settle out. Beneficial microor- ganisms (called biofilm) live on wetland plants and process some forms of pollution.
Explanation:
A gas of certain mass occupies a volume of 650cm^3 under a pressure of 750 mm Hg. Calculate the pressure under which the volume of gas will be reduced by 10 percent of its original volume.
Answer:
7500 mmHg
Explanation:
From the question,
Applying Boyles Law,
PV = P'V'................ Equation 1
Where P = original pressure, P' = final pressure, V = Original Volume, V' = Final Volume.
make P' The subject of the equation
P' = PV/V'.............. Equation 2
Given: P = 650 cm³, P = 750 mmHg, V' = (650×10/100) = 65 cm³ (Reduced by 10 percent of it original volume)
Substitute these values into equation 2
P' = (650×750)/65
P' = 7500 mmHg
help me how to do this
Answer:
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(c) Write the balanced neutralization reaction and calculate the volume in mL of a 1.420 M NaOH solution required to titrate 25.00 mL of a 5.400 M H2SO4 solution
Answer:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
190.14 mL of the NaOH solution would be required.
Explanation:
The balanced reaction is:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂ONow we calculate how many H₂SO₄ moles are there in 25.00 mL of a 5.400 M solution, using the definition of molarity:
Molarity = moles / litersMoles = Molarity * liters25.00 mL * 5.400 M = 135 mmol H₂SO₄Now we convert H₂SO₄ moles into NaOH moles, using the stoichiometric coefficients of the balanced reaction:
135 mmol H₂SO₄ * [tex]\frac{2mmolNaOH}{1mmolH_2SO_4}[/tex] = 270 mmol NaOHFinally we calculate the volume of a 1.420 M solution that would contain 270 mmoles:
Molarity = moles / litersliters = moles / molarity270 mmol / 1.420 M = 190.14 mLcan someone please go answer my last question
Answer:
Done and done
Explanation:
Hydrogen and oxygen react under a specific set of conditions to produce water according to the following equation.
2 H2(g) + O2(g) 2 H2O(g)
(a) How many moles of hydrogen would be required to produce 2.8 mol of water?
(b) How many moles of oxygen would be required?
Answer:
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1. What is an action citizen can take to prevent energy waste?
Answer:Switch off lighting in refrigeration areas when not in use?
Explanation:
. A green colour substance 'X' is heated strongly. Its colour changes to 'Y' and smell of burning sulphur is given out.
a. Name the substances X and Y.
b. Name the type of reaction taking place.
c. Write the balanced chemical equation for the reaction.
Answer:
_________(question)__________
. A green colour substance 'X' is heated strongly. Its colour changes to 'Y' and smell of burning sulphur is given out.
Explanation:
___(answer)___
a.
_______________
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What would be the oxidation number of the atoms in these compounds?
Answer:
Oxidation state] is defined as the charge an atom might be imagined to have when electrons are counted according to an agreed-upon set of rules:
The oxidation state of a free element (uncombined element) is zero for a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion.
Hydrogen has an oxidation state of 1 and oxygen has an oxidation state of −2 when they are present in most compounds. (Exceptions to this are that hydrogen has an oxidation state of −1 in hydrides of active metals, e.g. LiH, and oxygen has an oxidation state of −1 in peroxides, e.g. H2O2 the algebraic sum of oxidation states of all atoms in a neutral molecule must be zero, while in ions the algebraic sum of the oxidation states of the constituent atoms must be equal to the charge on the ion.
The same is written in my textbook. But how am I supposed to find the ox. number of an atom, which is in compound like K2UO4?
What are the symbols (in order) for hydrogen, sodium and nitrogen?
Answer:
H, Na, N
Explanation:
Answer:
H, NA, N
Explanation
Select all the correct answers.
The dumping of garbage caused the population of crabs in an area to drop from 2,000 to 500. Crabs eat algae and are preyed on by larger fish.
How will the crab's population change affect these two specles?
O
Food and space will be equally distributed among the three species.
. The population of predatory fishes will change.
O The biodiversity of the ecosystem will decrease.
. The algal population will Increase.
O The algal population will decrease.
Answer:
The population of predatory fishes will change.
The biodiversity of the ecosystem will decrease.
Explanation:
Answer:
The population of predatory fishes will change.
The biodiversity of the ecosystem will decrease.
Explanation:
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2. How does an atom of aluminum become an ion?
1. It gains 3 electrons
2. It loses 3 electrons
3. It gains 3 protons
4. It loses 3 neutrons
Answer:
it loses 3 electrons
Explanation:
Tell me if I’m right
The points labeled on the chart below represent the approximate size of Earth, the Milky Way, the Moon, and the Sun. The approximate size of the Solar System is also shown.Space Size Which point on the chart best represents the approximate size of the Sun? Question 5 options: W X Y Z
Answer:
The answer is Y
Explanation:
:p
List four reasons why scientists perform experiments.
Edit: this is for scientific research not chemistry, but they don't have that as a subject on here.
Answer:
1.To discover new things.
2.To improve accuracy of existing experiment.
3.To prove or disprove theories.
4.To find anomalies in experiment.
What is the molar mass for 5 mol Na
Answer:
22.98977 g/
Brainliest please
Answer:
molecular mass if Na
2
Co
3
=2×23×12+3×16
=46+12+48
=106
no.of mole =
molecular wt.
Given wt.
5=
106
wt
wt=s30
Explanation:
1.How many grams of zinc Zn and oxygen O2 will be needed to form 324 grams of ZnO after the reaction?
Answer: pretty sure its 0.214 moles * 40.3g/mole = 8.6g (2 sig figs) of MgO, and
0.035 moles * 40.3g/mole = 1.4g of MgO
Explanation:
Which element, when combined with phosphorus, would form an ionic compound?
A) Carbon.
B)Oxygen.
C)Magnesium.
D)Boron.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option C.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
Since phosphorus is a nonmetal, we need a metal. Out of given option the only element that is metal is Magnesium while others are non metal.
Therefore, the correct option is option C.
To learn more about chemical compound, here:
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Explain how surface waves work.
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6. Which type mixture does not allow light to shine through?
A) Ionic
B) Solutions
C) Colloids
D) Suspensions
10. What is a closed system in chemical equilibrium?
Explanation:
6. Which type mixture does not allow light to shine through?
D) Suspensions
10. What is a closed system in chemical equilibrium?
Solution:
A closed system is a system where neither products nor reactants can escape,The heat can be only exchanged freely For Example an ice coolerThe use of closed system for conducting chemical experiment in which temperature does not affect For Example reaching thermal equilibrium-TheUnknownScientist
How many grams are in 4.00 moles of Cr2O3?
Answer:
607.9616 grams
Explanation:
Decay chains exist because
radioactive elements remain radioactive regardless of decays.
radioactive elements require multiple decays in order to release all of their radiation.
radioactive elements can decay into stable or unstable elements.
radioactive elements require large amounts of time to decay to a stable element.
Answer:
Find the length of side x in simplest radical form with a rational denominator.
Answer:
The answer is C
radioactive elements can decay into stable or unstable elements.
What is the formula for dinitrogen pentoxide?
A) NO5
B) N5)2
C) N2O5
D)N2O7
What final temperature will be attained by a 250. g sample of Cu at 20.0oC if it absorbs 1000 J of heat? Cu 's c = 0.39 J/(g oC
Answer:
30.26 °C
Explanation:
From the question,
Q = cm(t₂-t₁)................ Equation 1
Where Q = Heat, c = specific heat capacity of Cu, m = mass of Cu, t₁ = Initial temperature, t₂ = Final temperature.
Given: Q = 1000 J, c = 0.39 J/g.°C, t₁ = 20°C, m = 250 g
Substitute into equation 1 and solve for t₂
1000 = 250×0.39(t₂-20)
250×0.39(t₂-20) = 1000
97.5(t₂-20) = 1000
(t₂-20) = 1000/97.6
(t₂-20) = 10.26
t₂ = 10.26+20
t₂ = 30.26 °C