Answer:
Chernobyl is a nuclear accident.
Explanation:
hope it helps you
Question is in the photo
how many protons does gold have
Answer:
gold has 79 protons
Explanation:
i looked it up lol
Help! I’ll give brainiest and don’t mind the answer i put .
Need help will mark brainliest!!
The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% for a mass of 62.93 amu and 30.8% for a mass of 64.93amu. Calculate the average atomic mass of copper.
Answer:
63.546
Explanation:
The Average atomic mass is calculated using the formula:
sum of the product of the atomic masses and their relative abundances all divided by 100 or total abundance
(science)
hurry help!!
All commonly abused drugs are illegal.
true or false
Answer:
False
Explanation:
Many abused drugs are prescription drugs.
Which statement correctly compares the sun and planets? A. Planets have an atmosphere; the sun does not. B. Planets gives off energy; the sun does not. C. Planets orbit the sun; the sun is at the center of the solar system. D. Planets are all made of solid materials; the sun is made of gases.
Answer:
c
Explanation:
because the sun is at the center of the universe the planet orbit the sun its basically a simple answer so if you need more help im right here
The sun and the planets are part of the solar system. The sun is in the center of the system, and the planets revolve around it. Thus, option C is correct.
What is the solar system?A solar system is a part of the Milky Way galaxy that includes the planets, stars, sun, moon, asteroids, etc. The Sun is the star that is fixed at the center of the system.
The planets are not fixed and revolve in orbit around the sun and rotate on their axis. The sun and planets are made up of gases and have different atmospheres.
Therefore, option C. sun is at the center around which the planets revolve.
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Pls help I will give brainlist
Answer:putis
Explanation:
ai domti now
How many moles of H2O(I) are formed from 3.85 mol of propane?
Answer:
15.4 moles
Explanation:
15.4 moles
Which of the following pairs of elements is most likely to form an ionic bond?
A.
nitrogen and oxygen
B.
lithium and chlorine
C.
phosphorus and chlorine
D.
selenium and bromine
Answer:
B.
lithium and chlorine
Explanation:
Ionic bonds are typically formed between a metal and nonmetal. Lithium is an alkali metal in group one and chlorine is a halogen from group seven. They will bond to form the salt, lithium chloride.
Which of the following are examples of a physical property of matter? Select all that apply.
The matter is made up of various types of particles which have a physical state and have inertia.
What are the physical property of matter? Select all that apply.1. Matter is colour less. (false)
2. Matter is hard in structure. (true)
3. Matter is soluble. (true)
4. Matter can not conduct electricity. (false)
5. Matter has boiling point but not melting point. (false)
6. Matter has both boiling and melting point. (true)
7. Matter has not the density. (false)
8. Matter has the malleability. (true)
Matter is made up of different kinds of particles which can occupy space and they have some mass. All the matters are made up of the elements. The elements contain specific physical and chemical properties. the matter can not be broken by any ordinary chemical reaction.
So we can conclude that the matter is made up of various types of particles which have a physical state and have inertia.
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in an experiment 3.425g of lead oxide was reduced to form 3.105g of lead the empirical formula of the lead oxide is?
Answer:
Pb3O4
Explanation:
According to this question, 3.425g of lead oxide was reduced to form 3.105g of lead in an experiment. Since lead oxide contains both lead (Pb) and oxygen (O) element,
Mass of lead oxide = 3.425g
Mass of lead = 3.105g
Mass of oxygen = (3.425g - 3.105g) = 0.320g
Next, we convert each mass value to mole by dividing by respective molar mass
Pb = 3.105g ÷ 207.2 = 0.0149mol
O = 0.320g ÷ 16 = 0.02mol
Next, we divide each mole value by the smallest (0.0149)
Pb = 0.0149mol ÷ 0.0149mol = 1
O = 0.02mol ÷ 0.0149mol = 1.342
Multiply each ratio value by 3 to get:
Pb = 1 × 3 = 3
O = 1.342 × 3 = 4.026
The whole number ratio, approximately, of Pb and O is 3:4, hence, their empirical formula is Pb3O4.
HELLLPP QUICK WILL MARK BRAINLIEST
Answer:
c
Explanation:
For the readion 2Na + Ch> 2NaCl, how many grams of Ch are required to read completely with 450 g Na
71.6g
6.09g
3.54g
21.1g
Given the following equation: C2H60 + 302 + 3H2O + 2CO2
If 2.0 moles of CO2 were produced, how many moles of O2
reacted?
Answer:
Explanation:
2 or 3 is correct
Answer: 3.0 moles
Explanation:
How does heat enhance the rate of chemical reaction? Explain in short.
Answer: the heat is rapidly changing
Explanation: as the heat continues to rapidly change so does the chemical as it also starts to change, so in a way you could use the example of a skateboard moving. This is because theres also friction in the skateboard which is made from the two things moving together and the heat is slowly increasing causing a reaction to the skateboard wheels so in a way it can cause more rapid changes
With the increase in heat or temperature, the rate of reaction will increase as more molcules will get kinetic energy for effective collisions.
What is the rate of the chemical reaction?The rate of reaction can be d as defined the speed at which the products are fromed from the reactants. The rate of a reaction provides information on how much time under which a chemical reaction can be completed.
The rate of a chemical reaction can be defined as the speed of the conversion of the reactants into products with time. Some reactions are instantaneous, while some chemical reactions take time to achieve the final equilibrium.
In some reactions, a catalyst can be used to increase the rate of the reaction. The catalyst provides the speed to the reaction in both forward and backward reactions by lowering the activation energy.
The pressure of the gaseous reactants increases, and the concentration of gases results in an increase in the rate of reaction. With an increase in the temperature, the average kinetic energy of the reactant molcules will be raised.
Therefore, more molecules will go under effective collisions. Therefore, the rate of reaction will be increased.
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Which statement describes a reaction at 298 K if AH = 31 kJ/mol, AS = 0.093
kJ/(mol-K)?
O A. Gibbs free energy is negative.
B. It is at equilibrium.
C. It is exothermic.
D. It is not spontaneous.
Answer: (D) it is not spontaneous.
Bread is made with which fungus?
morel
yeast
mold
chytrid
Answer:
yeast
Explanation:
sorry if incorrect
Sulfur trioxide is a gas that reacts with liquid water to produce aqueous sulfuric Acid or acid rain what is the equation for this reaction do not worry about balancing the equation.
Answer:
SO₃(g) + H₂O(l) → H₂SO₄(aq)
Explanation:
The molecular formula for the involved species are:
Sulfur trioxide = SO₃. ("trioxide" indicates the presence of 3 oxygen atoms).Water = H₂OSulfuric acid = H₂SO₄With the above information in mind we can proceed to write the reaction equation:
SO₃(g) + H₂O(l) → H₂SO₄(aq)write the chemial formula for H3PO4
Phosphoric acid, also known as orthophosphoric acid or phosphoric(V) acid, is a weak acid with the chemical formula H3PO4.
Which type of bonds does potassium form? Which type of bond is most
common?
Answer:
forms an ionic bond. Potassium and iodine have very different electronegativities. The two atoms would form an ionic bond since ionic bonds form between atoms with a large difference in electronegativity
Explanation: look it up
The correct coefficients needed to balance the following reaction are:
___ PbI2 + ___ ZnS → ___ PbS + ___ZnI2
a) 1, 2, 2, 1
b) 1, 1, 1, 1
c) 1, 1, 2, 2
d) 2, 1, 1, 2
how many grams of NaBr are in 20.5 L at STP
Answer:
94.15
Explanation:
1. Make a prediction - Do you think water molecules speed up or slow down
when they are heated? *
Answer:
disminuyne
Explanation:
(URGENT) will mark brainliest if you help me answer this
Question 1 options:
OH-
H+
Question 2 options:
OH-
H+
Question 3 options:
soap
bleach
apple juice
ammonia
Question 4 options:
lemon juice
bleach
milk
stomach acid
Question 5 options:
0-3
8-10
0-6
8-14
Question 6 options:
0-3
8-10
0-6
8-14
Question 7 options:
sour
bitter
sweet
salty
Question 8 options:
slippery
brittle
malleable
corrosive
Question 9 options:
slippery
brittle
malleable
corrosive
Question 10 options:
sour
bitter
sweet
salty
Answer:
For Q1: H+
For Q2: OH-
for Q3: Apple juice
For Q4: bleach
For Q5: 0-6
For Q6: 8-14
For Q7: Sour
For Q8: Corrosive
For Q9: Slippery
for Q10: Bitter
Explanation:
What is a function of the backbone in animals
Answer:
The major function of the vertebral column is protection of the spinal cord; it also provides stiffening for the body and attachment for the pectoral and pelvic girdles and many muscles. In humans an additional function is to transmit body weight in walking and standing.
Explanation:
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Which two elements have similar properties and 8 electrons in their
outermost shells?
O A. Neon and argon
B. Fluorine and chlorine
C. Lithium and sodium
D. Magnesium and calcium
Answer:
A
Explanation:
because they both belong to the Same group eight
Balance this equation (step by step please)
Answer:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> 2 KNO_{3} + PbCrO_{4}[/tex]
Reactions:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> KNO_{3} + PbCrO_{4}[/tex]
Explanation:
In the reaction, the CrO4(Chromate) is a compound NO3(Nitrate) is a compound as well.
Ignore the number in front of the reaction first, calculate how many K, Cr, O, Pb and N in the equation for both left and right side.
Left side: K=2, Cr=1, Pb=1, N=2, O=10
Right side: K=1, Cr=1, Pb=1, N=1, O=7
So we need 3 more oxygen, 1 more nitrogen and 1 more potassium on the right.
If we add a 2 in front of KNO3, there will be 2 potassium, 2 Nitrogen and 6 oxygen, which the reaction complete.
Conclusion:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> 2 KNO_{3} + PbCrO_{4}[/tex]
the volume of 9.0 M HCl needed to make 200.0 ml of 0.4 M HCl is?
Answer:
4.2 mL
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I need help with that.
Answer:
The three main cycles of an ecosystem are the water cycle, the carbon cycle and the nitrogen cycle. These three cycles working in balance are responsible for carrying away waste materials and replenishing the ecosystem with the nutrients necessary to sustain life.
Explanation:
cycles such as the water cycle keep the earth hydrated by feeding rain to trees, plants, etc.