The diagram represents wavelengths of different colors of visible light that pass by in a specific time period.
Answer:
Violet
Explanation:
Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below.
Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves.
Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.
Test 3: Heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees Fahrenheit.
Which statement provides the best assessment of his tests?
Only Test 3 will indicate a chemical property of sodium bicarbonate. Tests 1 and 2 will show a physical property of the substance.
Only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. Test 3 will show a physical property of the substance.
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
Only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. Test 2 will show a physical property of the substance.
Answer:
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
Explanation:
1) In test 1 we are dissolving sodium bicarbonate and here there is no chemical change in the property of sodium bicarbonate if it dissolved so it is a pure physical process.
2) In test 2 we are reacting sodium bicarbonate with vinegar (acetic acid).
The reaction is:
[tex]NaHCO_{3}+CH_{3}COOH--->CH_{3}COONa+H_{2}O+CO_{2}[/tex]
Due to formation of carbon dioxide it fizzes. Thus this is a chemical property of sodium bicarbonate to acts as base.
3) In test 3, we are heating and testing the melting point of sodium bicarbonate, which is again a physical property.
Which statement describes the periodic law?
Metals are both good conductors of heat and electricity.
Atomic masses always increase across a period.
Nonmetals are of the most reactive elements.
Elements in the same group have similar chemical properties.
elements is the same group have similar chemical properties
What is the molar mass of BF3
In order to reproduce, many flowering plants use external agents, such as insects or birds, to aid in the pollination process. What function do the color and odor of the flowers provide for the flowering plants?
A.
They help the plant feel happy and confident.
B.
They attract birds and insects which aid in the pollination process.
C.
They scare off larger animals that eat plants.
D.
They keep the pollinating insects from eating the plants.
The insects, birds, etc. are called pollinators. Because they help in pollination. The flowers attract birds and insects which aid in the pollination process. The correct option is B.
What is pollination?The process in which the pollen grains are transferred from the anther to the stigma of flowers is defined as the pollination. The agents which are responsible for the pollination are pollinators.
The flowers use scent to attract pollinators. A signal which helps the pollinators to find the particular flower is known as the scent. These floral scents are known to be a complex mixture of highly volatile compounds and essential oils that is emitted by the flowers into the atmosphere.
A flower scent's structure, color, and odor are the important factors which attract the pollinators. Those plants pollinated by bees and flies have sweet scents and those pollinated by beetles have fruity odors.
Thus the correct option is B.
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Consider the reaction: 2A(g)+B(g)→3C(g). When A is changing at a rate of -0.110M⋅s−1, How fast is C increasing?
Which product besides radiation do radioactive atoms give off when they decay?
A.
heat energy
B.
poisonous gases
C.
ridge pushes
D.
p waves
The radiations are released in the radioactive decay along with the heat energy. Thus, option A is correct.
What are radioactive atoms?The radioactive atoms are given as the one that has the presence of unstable nuclei. The unstable nuclei have been giving off radiations that form them to attain stability.
The radioactive atoms have been emitting the radiations from the nucleus to become stable, and the nuclear or the radioactive radiations from the radioactive decay.
The decay of the radioactive elements releases the radiations such as alpha, beta, gamma, and other radiations. The decay along with the release of the radiation releases energy.
Therefore, in radioactive decay, the atoms along with the radiations release heat energy. Thus, option A is correct.
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What is the value of ∆G in a spontaneous reaction?
less than 0
greater than 0
equal to 0
equal to 1
Two or more atoms of different elements covalently bonded together are referred to as __________.
sodium bicarbonate reacts with sulfuric acid to form sodium sulfate, carbon dioxide, and water. calculate the mass od sodium bicarbonate necessary to produce 1.75 g of carbon dioxide gas.
How would i even go about doing this?,
Please use the below balanced equation to answer this question. 2H2(g) + O2(g) -> 2H2O(l) How many grams of water will be produced if I have 83.4 liters of oxygen gas at STP?
A) 48.65 grams H2O
B) 65.78 grams H2O
C) 85.71 grams H2O
D) 134.18 grams H2O
Using the equation 2H2 + O2 --> 2 H2O, if 192 g of O are produced, how many grams of hydrogen must react with it? Help me understand how to do this?
What motivated arrhenius to calculate how changes in carbon dioxide might affect the climate?
How many moles of sodium acetate (nach3coo) must be added to 1.000 liter of a 0.500 m solution of acetic acid (ch3cooh) to produce a ph of 5.675? the ionization constant of acetic acid is 1.8 × 10−5 ?
ck(CH₃COOH) = 0,5 M.
V = 1 L.
Ka = 1,8·10⁻⁵.
pKa = -logKa = 4,75.
pH = 5,675.
Henderson–Hasselbalch equation: pH = pKa +
log(cs/ck).
5,675 = 4,75 + log(cs/ck).
log(cs/ck) = 5,675 - 4,75 = 0,925.
cs/ck = 10∧(0,925) = 8,4.
cs = 8,4 · 0,5 M = 4,2 M.
n(CH₃COONa) = 4,2 mol/L · 1 L = 4,2 mol.
when you discuss calories in food you are talking about kilocalories (Kcal) which is the amount of heat necessary to raise 1000 mL of water by 1 degree Celsius which is approximately 4.18 kJ. compare the number of Kilocalories in one gram of tomatoes to the number of Kilocalories in one gram of corn chips
100 g of corn chips has 17.69 calories
1 g of corn chips has 17.69/100 or 0.1769 calories
Therefore, 1 g of tomatoes has 0.1769 x 10⁻³ kilocalories
100 g of corn chips has 518 calories
1 g of corn chips has 518/100 or 5.18 calories
Therefore, 1 g of corn chips has 5.18 x 10⁻³ kilocalories
What element is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p65s2 4d10 5p4?
The element with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4 is Tin (Sn). This is found by adding up the electrons in each part of the configuration.
Explanation:The electron configuration provided, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4, represents the element Sn, or Tin in the periodic table. The configuration corresponds to the distribution of electrons among different energy levels (shells) and sub-levels in an atom. To identify the element, we add up the electrons represented by each part of the configuration (e.g., s2 implies 2 electrons, p6 implies 6 electrons etc.). We see that the total number of electrons is 50, which corresponds to the atomic number of Tin (Sn) in the periodic table.
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How do you balance this chemical equation?
barium chlorate --> barium chloride + oxygen
I'm really confused on this question because it contains some ionic compounds. How would you balance it? Thanks!,
To balance the equation for the decomposition of barium chlorate into barium chloride and oxygen, ensure that there are equal numbers of each atom on both sides of the equation. The balanced equation is 2 Ba(ClO₃)₂ → 2 BaCl₂ + 3 O₂.
To balance the chemical equation for the decomposition of barium chlorate into barium chloride and oxygen, we must ensure that the number of each type of atom is the same on both sides of the equation. The formula for barium chlorate is Ba(ClO₃)₂, barium chloride is BaCl₂, and oxygen is O₂ (since oxygen is a diatomic molecule).
The unbalanced equation is as follows:
Ba(ClO₃)₂ → BaCl₂ + O₂
To balance this equation:
First, balance the oxygen atoms. There are 6 oxygen atoms on the reactant side (from two chlorate ions) and 2 on the product side (one O₂ molecule). Place a coefficient of 3 in front of the O₂ to balance the oxygen atoms.Now, check the barium and chlorine atoms. Each side has one barium atom and two chlorine atoms, so they are already balanced.The balanced equation is:
2 Ba(ClO₃)₂ → 2 BaCl₂ + 3 O₂
A force has to push the bug forward. Identify this force. How does the bug produce it?
How many grams of CO2 are in 6 mol of the compound (this is a science question)? and the units?
Write a balanced symbol equation for the complete combustion of propanol
A species that changes the rate of a reaction but is neither consumed nor changed is
A. A catalyst.
B. An activated complex.
C. An intermediate.
D. A reactant.
A. A catalyst!!!
Hope it Helps!!!
The typical carbon atom is described in the periodic table by the accompanying box. how many neutrons are in a typical carbon atom?
The activation energy for the reaction no2(g)+co(g)⟶no(g)+co2(g) is ea = 175 kj/mol and the change in enthalpy for the reaction is δh = -200 kj/mol . what is the activation energy for the reverse reaction?
Final answer:
The activation energy for the reverse reaction of NO2(g) + CO(g) → NO(g) + CO2(g) is 375 kJ/mol. This is calculated using the formula that subtracts the change in enthalpy from the activation energy of the forward reaction.
Explanation:
The activation energy for the reverse reaction can be determined using the concept that the activation energy for a reaction and the activation energy for the reverse reaction must total the energy difference between the reactants and the products, which is given by the change in enthalpy (ΔH). The given forward reaction NO2(g) + CO(g) → NO(g) + CO2(g) has an activation energy (Ea) of 175 kJ/mol and a change in enthalpy (ΔH) of -200 kJ/mol.
To find the activation energy for the reverse reaction, we use the formula:
Activation energy of reverse reaction = Activation energy of forward reaction - ΔH
Plugging in the values we get:
Activation energy of reverse reaction = 175 kJ/mol - (-200 kJ/mol)
This calculation yields an activation energy for the reverse reaction of 375 kJ/mol.
Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 4.00 moles of aluminum sulfate, al2(so4)3. express the number of moles of al, s, and o atoms numerically, separated by commas.
The number of moles of aluminum, sulfur, and oxygen atoms in 4.00 moles of aluminum sulfate, Al₂(SO₄)₃ are 8.00, 12.00, and 48.00, respectively.
Aluminum: There are 2 aluminum atoms in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 2 x 4.00 = 8.00 moles of aluminum atoms.
Sulfur: There is 1 sulfur atom in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 1 x 4.00 = 12.00 moles of sulfur atoms.
Oxygen: There are 12 oxygen atoms in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 12 x 4.00 = 48.00 moles of oxygen atoms.
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Compare and contrast the properties of acids and bases. include two similarties and two differences.
Acids and bases are similar in that they conduct electricity in aqueous solutions and both react to form salt and water. Their differences lie in taste, color changes in litmus paper, and pH values where acids have pH lower than 7 and bases have pH greater than 7.
Explanation:Acids and bases are both types of compounds that chemists often deal with. They are similar in that they both conduct electricity when in aqueous solution and they both react with each other to form salt and water, a reaction known as neutralization. However, they are also distinctly different. The first difference is that acids have a sour taste and can turn blue litmus paper red, while bases have a bitter taste and can turn red litmus paper blue. Additionally, acids tend to have a pH less than 7, whereas bases have a pH greater than 7.
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Which Of the following compounds is an electrolyte?
a)rubbing alcohol
b)sugar
c)silicon dioxide
d)sodium hydroxide
Why do the number of atoms of each element have to be the same on both sides of the equation?
#1: Martha has a large amount of 1.25 M H2SO4 in her lab. She needs 36 grams of H2SO4 for a chemical reaction she wants to perform. How many liters of the solution should she use?
A. 2.9 L
B. 5.8 L
C. 0.58 L
D. 0.29 L
***my answer: D. 0.29 L
is that right? @chmvijay :),
Answer:
D. 0.29 L
Explanation:
To calculate the required volume, we can convert the concentration of the solution from M to g/L, keeping in mind the molar mass of H₂SO₄, 98 g/mol :
1.25 [tex]\frac{mol}{L}*\frac{98g}{1mol}=[/tex]122.5 g/L
So a concentration of 1.25 M of H₂SO₄ is the same as a concentration of 122.5 g/L.
Finally we divide 36 grams by the concentration:
[tex]\frac{36g}{122.5g/L}[/tex] = 0.29 L
So your answer was correct, it is option D.
atoms with 5 valence electrons usually form how many bonds?,
The main source of phosphorous is in: rocks water plants the atmosphe
Answer:
rocks
Explanation:
Answer:
Rocks
Explanation: