Explanation:
A balanced chemical equation is one where all the individual atoms are equal on both sides of the reaction. It follows the law of conservation of mass.
For 1:When potassium phosphate reacts with silver nitrate, it leads to the formation of silver phosphate and potassium nitrate.
The balanced chemical equation follows:
[tex]3AgNO_3+K_3PO_4\rightarrow Ag_3PO_4+3KNO_3[/tex]
For 2:When barium bicarbonate reacts with calcium hydroxide, it leads to the formation of barium carbonate, calcium carbonate and water
The balanced chemical equation follows:
[tex]Ba(HCO_3)_2+Ca(OH)_2\rightarrow BaCO_3+CaCO_3+2H_2O[/tex]
A location along stream where most erosions occur
Answer:
At a stream's headwaters, often high in the mountains, gradients are steep. The stream moves fast and does lots of work eroding the stream bed.As a stream moves into lower areas, the gradient is not as steep. Now the stream does more work eroding the edges of its banks.
hope that helps bby<3
The correct pathway for air entering the human respiratory system is _______.
A)nose, trachea, alveoli, bronchi
B)nose, bronchi, trachea, alveoli
C)alveoli, trachea, epiglottis, nose
D)nose, trachea, bronchi, alveoli
Answer: D
Explanation:
what is the molarity of a solution made by dissolving 18.5 grams of NaCL into enough water to reach 450.0ML
Answer:
0.702M
Explanation:
Molarity of a solution, which refers to the molar concentration of that solution can be calculated thus;
Molarity = number of moles (n) ÷ volume (V)
Firstly, we convert 18.5 grams of NaCl to moles using the formula; mole = mass/molar mass
molar mass of NaCl = 23 + 35.5 = 58.5g/mol
mole = 18.5/58.5
mole = 0.32moles
Volume of water (V) = 450mL = 450/1000 = 0.450L
Molarity = n/V
Molarity = 0.32/0.450
Molarity = 0.702M
Rounded to the nearest whole number, how many electrons are in an atom of zirconium?
Answer:
40 electrons
Explanation:
The element of zirconium (Zr) has an atomic number of 40, which means it has 40 protons and 40 electrons. It also has a molar mass of 91.224 g/mol.
The emission spectrum of hydrogen is shown below. What do the lines in the
spectrum show?
A. Light with wavelengths between 410 nm to 434 nm, 434 to 486 nm, and 486 to 656 nm corresponds with the three energy levels in
hydrogen
B. Only light with wavelengths of 410 nm, 434 nm, 486 nm, and 656 nm is not taken in during energy transitions.
C. Light with wavelengths of 410 nm, 434 nm, 486 nm, and 656 no corresponds with the four energy levels in hydrogen.
D. Light with wavelengths of 410 nm, 434 nm, 486 nm, and 656 nm is given off when electrons fall to lower energy levels.
Answer:
A
Explanation:
Same air has special carakteristik features
What is the mass of one mole of sodium
Answer:
58.44 g/mol
Explanation:
Formula: NaCl
Density: 2.16 g/cm³
Melting point: 801 °C
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PLEASE HELP ME!
When magnesium powder is heated, it combines with oxygen to form white magnesium oxide powder.
(a) State one use of magnesium oxide.
(b) Write the chemical equation of this reaction.
(c) Calculate the mass of magnesium oxide formed if 3g magnesium is completely burnt in excess oxygen.
(d) The magnesium oxide is basic and reacts with hydrochloric acid to form magnesium chloride salt and water. Write the chemical equation of this reaction. (Relative atomic mass of O=16,Mg=24)
Explanation:
a. Magnesium oxide is used mainly in soil treatment and groundwater remediation, wastewater treatment, etc. it is used for it's acid buffering capacity and effectiveness in dissolving heavy metals.
b. MgO is the chemical equation for the reaction.
c. multiply the given mass of O2 by the inverse of it's molar mass. multiply the molar ratio (from the balanced equation) between O2 and MgO. Multiply by the molar mass of MgO. 32g O2 x 1 mol O2 ... 32g O2 x 2mol MgO 1mol O2 x 40g MgO. .... 1mol MgO = 80 g.
d. Mg (s) + 2 HCl (aq) produces MgCl 2(aq) + H 2 (g). Where the letter "s" stands for solids, and "g" is for gas and "aq" represents aqueous solution.
draw the structure of but- 2-ene
Answer:
hope this helps :)
Explanation:
What will change if liquid 5.0 molar NiCl2 is added?
When liquid 5.0 molar NiCl₂ is added to 0.3 M of NiCl₂ solution :
Molarity will increase ( A )
What is Molarity ?
Molarity is the measure of the number of moles of solute present per volume of the solution. The addition of 5.0 molar nickel chloride into a 0.3M Nickel chloride solution will lead to an increase in the number of moles of Nickel chloride present in the solution.
Molarity is directly proportional to moles of solute in a solution therefore the molarity of the solution will increase.
Hence we can conclude that When liquid 5.0 molar NiCl₂ is added to 0.3 M of NiCl₂ solution : Molarity will increase.
Learn more about Molarity : https://brainly.com/question/17138838
When the products of a reaction have less energy than the reactants
Answer:
the energy of the products is less than the energy of the reactants.
Explanation:
the the change is enthalpy is negative, and heat is released to the surroundings.
Help I dont know how to do this
PLEASE HURRY!
What is the half-life of a 12 g sample of radioisotope that decayed to 6 g in 28
years?
A. 14 years
B. 7 years
C. 56 years
D. 28 years
Answer:
28 years
Explanation:
the information is literally in the question.
The process of nuclear division that produces haploid sex cells is mitosis. Please select the best answer from the choices provided T F
Answer:
Explanation:
meiosis
Haploid sperm and eggs are produced via meiosis.
The closest living relatives to Gorillas are:
(Look at pic)
A. Humans
B. Chimpanzees, and humans equally
C. Orangutans
D. Chimpanzees
(DO NOT ANSWER IF YOU CANNOT ACTUALLY HELP)
[tex]what \: is \: chemical \: reaction \: {?} \: [/tex]
what is a chemical reaction?
Explanation:A chemical reaction is a process in which one or more reactants are transformed into one or more products. Chemical elements and compounds are both substances. The component atoms of the reactants are rearranged in a chemical reaction, resulting in distinct compounds as products.
-------------------------hope it helps...have a great day!!the periodic table below shows major regions in different colors. which answer choice describes all nonmetals?
A. hydrogen and all of the elements in blue boxes
B. hydrogen and all of the other elements in orange boxes
C. all elements of group 18 in orange boxes
D. all of the elements of period 2 in green boxes
PLS HELP!!
Answer:
b
Explanation:
because it's more orange in the boxes then others
Which is true of the enthalpy of a reaction?
A. Its value depends on which reactions are added
B. Its value is the same as the enthalpy of each intermediate reaction
c. Its value is always a negative kJ/mol
D. Its value does not depend on which reactions are added
D. It’s value does not depend on which reactions are added
Question 2 of 10
Why is the atomic theory important?
Answer:
It lead to scientific breakthroughs in chemistry.
Explanation:
Which event is a chemical change?
O a) The paint cracks and chips,
O b) The roof
the car dents
Oc) The baseball strikes the roof.
O d) The exposed metal rusts.
already answered but i would appreciate it if someone checked for me !!
Answer:
correct
Explanation:
I belve ou got it
7) The negative-feedback system of the endocrine system works much like a ______
Answer: Most of the hormones released by endocrine system are regulated by negative feedback mechanism.
- Negative feedback mechanism functions to reduce the intensity of original stimulus in order to maintain homeostasis.
Explanation:
When blood calcium levels are decreased, parathyroid gland releases parathyroid hormone (PTH).
PTH acts on bone and stimulate bone resorption by promoting osteoclastic activity. It stimulates reabsorption of calcium in kidneys. PTH promotes calcitriol synthesis that acts on small intestine to increase calcium absorption.
Action of PTH increases blood calcium levels.
When blood calcium levels are increased, thyroid gland releases hormone calcitonin.
Calcitonin opposes PTH and acts to deposit calcium in the bone.
Calcitonin acts on osteoblasts and promote increase in bone mass.
Action of calcitonin decreases blood calcium levels.
Which number is equal to the number of protons in the atom
Answer:
The number of electrons is equal to the number of protons
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the electrons number is equal to the number of protons in the atom.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. In an atom, the number of electron or atomic number is s equal to the number of protons in the atom.
Therefore, the electrons number is equal to the number of protons in the atom.
To know more about atom, here:
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2) 2KClO3 --> 2KCl + 3O2
a) How many moles of O2 are produced from 19 moles of KClO3?
b) How many kilograms of KClO3 would decompose to form 62 moles of KCl?
c) How many grams of O2 are required to react with 39 grams of KCl?
show work
[tex]2 \text{ KClO}_3 \to 2 \text{ KCl}+3\text{ O}_2[/tex]
a)
[tex]2 \text{ mols of KClO}_3 \equiv 3 \text{ mols of O}_2[/tex]
[tex]19 \text{ mols of KClO}_3 \equiv 3\cdot 9,5 \text{ mols of O}_2[/tex]
[tex]\boxed{19 \text{ mols of KClO}_3 \equiv 28,5 \text{ mols of O}_2}[/tex]
b)
[tex]2 \text{ mols of KClO}_3 \equiv 2 \text{ mols of KCl}[/tex]
[tex]62 \text{ mol of KClO}_3 \equiv 62 \text{ mol of KCl}[/tex]
Using the atomic mass given in the periodic table:
[tex]62\cdot(39+35,5+16\cdot3) \text{ g of KClO}_3 \equiv 62 \text{ mol of KCl}[/tex]
[tex]62\cdot122,5 \text{ g of KClO}_3 \equiv 62 \text{ mol of KCl}[/tex]
[tex]7595 \text{ g of KClO}_3 \equiv 62 \text{ mol of KCl}[/tex]
[tex]\boxed{7,595 \text{ kg of KClO}_3 \equiv 62 \text{ mol of KCl}}[/tex]
c)
[tex]2 \text{ KCl}+3\text{ O}_2\to 2 \text{ KClO}_3[/tex]
[tex]3 \text{ mols of O}_2 \equiv 2 \text{ mols of KCl}[/tex]
Using the atomic mass given in the periodic table:
[tex]3\cdot(2\cdot 16) \text{ g of O}_2 \equiv 2\cdot(39+35,5) \text{ g of KCl}[/tex]
[tex]96\text{ g of O}_2 \equiv 149\text{ g of KCl}[/tex]
[tex]\dfrac{39}{149}\cdot 96\text{ g of O}_2 \equiv \dfrac{39}{149}\cdot 149\text{ g of KCl}[/tex]
[tex]\boxed{25,13\text{ g of O}_2 \equiv 39\text{ g of KCl}}[/tex]
This result is an aproximation.
When butanoic acid is reacted with methanol (using H2SO4 as a catalyst), what will be produced?
Answer:
alcohol (OH) + organic acid (COOH) → ester + water
Explanation:
example:
methanol + butanoic acid → methyl butanoate + watermethyl
Which statement best supported by the data on the map
Which of the following is the correct electron
configuration for titanium (Ti)?
Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d2
Explanation:
1s2 2s2 2p6 3s2 3p6 4s2 3d2
Đốt cháy hoàn toàn 0,1 mol axit đơn chức cần V lít O2 ở đktc. Thu được 0,3 mol CO2 và 0,2 mol h20 vậy giá trị V là
Answer:
Complete combustion of 0.1mol of monocarboxylic acid requires V litres of O2 at dtc. and the reaction produces 0.3mol of CO2 and 0.2mol of H2O.
What is the value of V?
Explanation:
The balanced chemical equation of the reaction is
[tex]HCOOH+O_2 -> 2CO_2+2H_2O\\[/tex]
1mol. of acid reacts with 1mol of [tex]O_2[/tex] and produce 2mol. of CO2 and 2mol. of H2O.
Given,
0.1mol of acid requires how many litres of oxygen at STP?
0.1mol of acid requires 0.1mol of oxygen.
Since, 1mol of oxygen at STP occupies 22.4L of volume.
Hence, the volume occupied by 0.1mol of oxygen is -- 2.24L
Answer is:
The value of V is 2.24L.
Which three types of reactions yield a product that is a chemically bonded combination of reactants?
Answer:
oxidation, synthesis, polymerization.
magnesium hydroxide + sulfuric acid please
Answer:
H2SO4 + Mg(OH)2 → H2O + MgSO4
Explanation:
when magnesium hydroxide reacts with sulfuric acid you get magnesium sulfate
hope this helps
Which substance would require the most energy to heat 10.00 g of it by 10.0°C?
O Ice, c = 2.03 Jigº
O Mercury, c = 0.140 J/gºC
O Water, c = 4.18 J/gºC
O Aluminum, c = 0.902 J/gºC
Answer:
a
Explanation:
a
