Answer:
11
Explanation:
the atomic number is the same as the number of electrons
In which step of the scientific method is information obtained through the senses? a. drawing conclusions b. making observations c. analyzing data d. revising a hypothesis
Hello There,
The answer is:
B. making observations
Hope this help have a great day:)
The step of the scientific method in which information is obtained through the sentence is making observations (option B).
What is the scientific method and what steps does it involve?The scientific method is a standardized method used to understand natural phenomena by testing hypotheses. The first step in this method is to make observations, which means you gather information through senses such as sight, touch, and hearing, among others.
This step is followed by creating a hypothesis and then testing this hypothesis through a specific experiment. Based on this, the correct step is making observations (option B).
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true or false atoms of difference elements can combine to form compound?
It's true
There are thousands of combinations that can be put together to form a all sorts of compounds. That's the whole basis of inorganic chemistry. Organic chemistry is a little bit different. It is more restricted.
It's True my dude!!!!!!!!!!!!!!!!
Which are ways of showing probability? Check all that apply. A.50% B.557 C.1 × 104 D.25%
Option: A and D are the correct answer.
A. 50% and D. 25%
Explanation:We know that the probability of an event is the chance of occurring of an event.
The probability of an event always lie between 0 and 1.
It is equal to zero if the event will never occur and is equal to 1 if the event is certain to occur.
Also, the probability could be in ratio or it could be in percentage and the percent may be between 0%-100%
Hence, in the given options:
B) 557 is incorrect as the probability is greater than 1.
c) 1×104=104 is incorrect since the probability is greater than 1
Hence, the correct options are:
A. 50%
and D. 25%
use the equation below to determine how many liters of NH3 are needed to react completely with 10.0 L of N0 at STP
Answer is: 6.66 L of NH3 are needed to react completely.
Balanced chemical equation: 4NH₃ + 6NO → 5N₂ + 6H₂O.
V(NO) = 10.0 L; volume of nitrogen(II) oxide.
V(NH₃) = ?
Vm = 22.4 L/mol; molar volume at STP.
n(NO) = V(NO) ÷ Vm.
n(NO) = 10 L ÷ 22.4 L/mol.
n(NO) = 0.446 mol; amount of nitrogen(II) oxide.
From balanced chemical equation: n(NO) : n(NH₃) = 6 : 4
0.446 mol : n(NH₃) = 6 : 4.
n(NH₃) = 0.3 mol; amount of ammonia.
V(NH₃) = 0.3 mol · 22.4 L/mol.
V(NH₃) = 6.66 L.
after learning about the law of conservation of mass, Remy began to wonder about how to best test this law. She wanted to show that the amounts of matter did not change but produced an equal amount of a different kind of matter. What is the best way to study this law?
a.) in a heterogeneous mixture
b.) in a homogeneous mixture
c.) in a open system
d.) in a closed system
Answer is: d.) in a closed system.
Conservation of mass: during chemical reaction no particles are created or destroyed, the atoms are rearranged from the reactants to the products.
Closed system is a physical system that does not allow transfer of mass and energy in or out of the system.
For example, chemical reaction: 2CH₃OH + 3O₂ → 2CO₂ + 4H₂O.
1) There are four hydrogen atoms, one carbon atom, four oxygen atoms in this chemical reaction.
2) There are eight hydrogen atoms, two carbon atoms, eight oxygen atoms in this chemical reaction.
To study the law of conservation of mass, a closed system is ideal because it prevents mass from entering or exiting, allowing for accurate observation of matter transformation.
Explanation:The best way to study the law of conservation of mass is in a closed system. A closed system does not allow the exchange of matter with its surroundings, ensuring that mass can neither enter nor leave the system. This creates an ideal environment to observe that matter is neither created nor destroyed but only transformed in chemical reactions.
For example, if you bake dough in a closed system like a sealed container, the mass of the dough before and after baking would remain the same, despite the release of gases that cause the dough to rise. The total mass of the reactants (dough) equals the total mass of the products (bread and gases), thereby complying with the law of conservation of mass.
The products of the neutralization reaction between hydrochloride acid and magnesium hydroxide are
MgCl12 and H20
Hope it helps!
magnesium chloride (MgCl₂) and water (H₂O).
The text says, "refugee and immigrant Children in Canada have significant similarities."
what does significant mean?
A bacterium called Bacillus thuringiensis (B.t.) contains a protein that can kill cotton ballworms and certain other kinds of caterpillars. A different bacterium called Agrobacterium tumefaciens has the ability to insert its genetic material into plants. Scientists in the late twentieth century took a gene from (B.t.) and inserted it into specimens of Agrobacterium tumefaciens. Genetic material from the Agrobacterium tumefaciens specimens was then inserted into cotton plants. The goal of these tests was to reduce caterpillar infestation in the cotton plants.
This is genetic engineering.
I hope this helps!
Cheer,s July.
Answer:
genetic modification.
Explanation:
For what anions are the compound always soluble in water?
I believe the compounds of Na+ , K+ and NH4+ are always soluble in water.
How do u do this ??? I need help1
so for shortest it would be x-rays, middle would be red visible light and longest would be infrared
the one with most energy would be gamma rays and the least would be radio waves i think.
A girls walks 4 steps forward and then 3 steps backward. The girls distance walked is _________ steps and her displacement is ____________ steps. A) 1, 7 B) 3, 4 C) 7, 1 D) 7, 7
The distance walked would be the total amount of her movement.
4 steps+3 steps=7 steps
The displacement is how far from her original location the girl is.
4 steps-3 steps=1 step.
C) 7, 1
Hope this helps!!
Explain how the Rutherford gold foil experiment correctly advanced atomic theory away from the plum pudding model?
Answer:
D. It proved the positive charge is concentrated in a relatively small region of the atom.
Explanation:
it was on USATestprep!!!!
calculate the mass number for an atom that has 45 neutrons and 35 electrons.
80. Is your answer. You just add them.
What step must be performed before any stoichiometry problem is solved? Explain
Balancing the Equation, Converting Given Units of a Substance to Moles, mole ratio, convert to desired units
Balance the chemical equation, convert the unit into moles, calculate the moles of the product, and convert the moles of the product into desired units.
What are stoichiometry calculations?
Stoichiometry involves the relationship between reactants and products in a chemical reaction.
The first step in any stoichiometry problem is to balance the chemical reaction.
In stoichiometric calculations, both sides of the chemical equation must have the same number of atoms of each element. We use stoichiometric coefficients to balance the chemical reaction.
Convert the given mass of the reactant into moles.
The next step is to use the mole ratio concept to calculate the moles of the other substance from the moles of the given reactant.
Then use the moles of the reactant to calculate the moles of the yielded product in the chemical reaction.
In the end, convert the moles of the product into the desired units.
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who is sheikh hasina
"Sheikh Hasina Wazed is the current and 10th Prime Minister of Bangladesh, in office since January 2009. She is the longest serving prime minister in the history of Bangladesh. Hasina is the daughter of Bangladesh's first President Sheikh Mujibur Rahman. Her political career has spanned more than four decades".
Sheikh Hasina Wazed, byname Sheikh Hasina, Wazed also spelled Wajed, (born September 28, 1947, Tungipara, East Pakistan [now in Bangladesh]), Bengali politician and leader of the Awami League political party, who twice served as prime minister of Bangladesh (1996–2001; 2009– ) Bearing the legacy of her father, who led Bangladesh’s liberation war, Hasina has never been afraid of a fight. So when several hundred thousand ethnic Rohingya refugees started streaming into Bangladesh last August to escape atrocities by the Myanmar army, she accepted the humanitarian challenge. An impoverished country, Bangladesh had not welcomed massive influxes of refugees in the past, but she could hardly turn back the traumatized victims of ethnic cleansing.
I have 4 moles of CO₂. How many molecules of CO₂ is this? Show your work. Scientific notation example: 6.02 x 10^23
Final answer:
To calculate the number of CO₂ molecules in 4 moles, multiply 4 by Avogadro's number (6.022 × 10²³). The result is 2.4088 × 10²⁴ molecules of CO₂.
Explanation:
To find the number of CO₂ molecules in 4 moles, we use Avogadro's number, which states that one mole of any substance contains exactly 6.02214076 × 10²³ molecules. Therefore, to calculate the number of molecules in 4 moles of CO₂, you multiply the number of moles by Avogadro's number.
Calculation:
Number of CO₂ molecules = Number of moles × Avogadro's numberNumber of CO₂ molecules = 4 moles × 6.022 × 10²³ molecules/moleNumber of CO₂ molecules = 24.088 × 10²³ moleculesNumber of CO₂ molecules = 2.4088 × 10²⁴ moleculesTherefore, 4 moles of CO₂ contain 2.4088 × 10²⁴ molecules.
how many moles of 02 can be prepared from 6.75 moles of KCIO3 ?
The equation for this question could be [tex]2KClO_{3}[/tex]→[tex]2KCl+3O_{2}[/tex] .
so for 6.75 moles of [tex]KClO_{3}[/tex] *3 moles of O_{2}/2 moles of [tex]KClO_{3}[/tex]
= 10.125
researchers have discovered that a moon rock brought back by the Apollo Astronauts has a mass of 5.671 kg and a volume of 1698 cm3. what is the density of the rock?
the answer would be 3.340 g/cm3
The Law of Conservation of Matter describes how mass is not lost during a chemical reaction.
True
False
False, it states that matter can be nether created nor destroyed
Answer:
false
Explanation:
because it tells you the matter can't be created or destroyed.
What does a plateau represent on hearing curve
A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.
Enlist the 2factors which are used in the formation of dry ice
Carbon dioxide is a gas at normal room temperature and atmospheric pressure. Carbon dioxide gas converts into solid carbon dioxide when frozen to a particular temperature with no intermediate liquid phase. This frozen or solidified carbon dioxide is called dry ice. Dry ice is formed when gaseous carbon dioxide is cooled to very low temperatures under high pressure. High pressure brings about condensation of the gas molecules and low temperature solidifies the carbon dioxide gas. Therefore, tow factors that help in formation of dry ice are low temperature and high pressure.
What will occur if the velocity of the gas molecules colliding with the sides of the container increases?
The pressure of the gas will increases
Answer:
The kinetic energy will increase and the pressure of the gas will also increase.
Explanation:
An increase in temperature will normally cause an increase in volume. Because the gas is enclosed in a rigid container the volume of the container can not increase.
An increase in temperature is by definition is an increase in kinetic energy. The increase in kinetic energy will cause the molecules of the gas to move more rapidly. As the molecules move more rapidly they collide with each other more violently. These collisions will cause an increase in pressure.
Mg + HCI = MgCI2 = H2
The equation Mg + HCl = MgCl2 + H2 represents a chemical reaction where magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2). This is also an example of a redox reaction, where magnesium is oxidized and hydrogen is reduced.
Explanation:The equation Mg + HCl = MgCl2 + H2 represents a chemical reaction where magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2). The equation tells us that one mole of magnesium reacts with two moles of hydrochloric acid to produce one mole of magnesium chloride and one mole of hydrogen gas - this can be seen as an example of single displacement reaction.
This process is also an example of a redox reaction, in which magnesium is oxidized and hydrogen in HCl is reduced.
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Which method of heat transfer takes place when particular of matter vibrate and collide with each other in direct contact?
Conduction
Convection
Insulation
Radiation
what is the structure of 3-propyl-2-methyl-1-pentanoic acid
does any body know so plz help?
Answer:
Explanation:
Counting on the chain will be from the end where carboxylic group is attached. So, in a structure of 3-propyl-2-methyl-1-pentanoic acid, there is a
The very first carbon of the chain is in the form of carboxylic acid functional group (-COOH).Propyl group present on the third carbon atom in a five member chain in a five member chain.Methyl group is present on the second carbon atom in a five member chain.So, the structure will be drawn as image attached.
What do scientists call organisms, such as plants, which make their own food?
Most plants are called autotrophs they make their own food
A pure sample of a compound is found to contain 1.11x1022 nitrogen atoms of and 2.22x1022 oxygen atoms. What is the empirical formula of the compound?
The empirical formula of the compound is NO₂
calculation
Step 1: find the moles of Nitrogen and oxygen using the Avogadro's law constant
That is according to Avogadro's law 1 mole = 6.02 x 10²³ atoms
The moles of nitrogen (N) is calculated as below
= 1 mole = 6.02 x 10²³ atoms
? moles= 1.11 x 10²² atoms
by cross multiplication
= {(1 mole x 1.11 x10²² atoms) / 6.02 x 10²³ atoms} = 0.0184 moles
moles of oxygen is calculated as below
1 mole = 6.02 x 10 ²³ atoms
? moles= 2.22 x 10²² atoms
by cross multiplication
={ (1 mole x 2.22 x 10²² atoms) / 6.02 x 10²³} = 0.0369 moles
Step 2: find the mole ratio of N to O by dividing each mole by smallest number of mole (0.0184)
That is;
for N = 0.0184 /0.0184 = 1
for O =0.0369/0.0184 =2
Therefore the empirical formula = NO₂
If molarity = moles liter , then how many grams of NaCl are needed to make 1 liter of a 0.1 M solution? A) 0.0584 g NaCl B) 3.246 g NaCl C) 5.844 g NaCl D) 58.44 g NaCl
The grams of NaCl that needed to make 1L of a 0.1 M solution is
5.845 g (answer C)
calculation
Step 1: find the moles of NaCl
moles = molarity x volume in liters
molarity = 0.1 M =0.1 mol/l
= 1 L x 0.1 Mol/L = 0.1 moles
Step 2: find the mass NaCl
mass = moles x molar mass
From periodic table the molar mass of NaCl = 23 +35.45 =58.45 g/mol
mass= 0.1 moles x 58.45 g/mol =5.845 g appropriate ( answer C)
To calculate the number of grams of NaCl that would be needed to make 0.1 M of solution we have to calculate;
The molecular weight of sodium chloride (NaCl) which is 58.44 g, so one gram molecular weight will be= 1 mole which is 58.44 g.By dissolving 58.44 g of NaCl upto the final volume of 1 litre, one can get 1 M NaCl solution.So, to make 0.1 M NaCl solution we have to dilute the mass of salt to 1000 ml of solution as follows;0.1 M NaCl solution will require 0.1 x 58.44 g of NaCl = 5.844 g. of NaCl.Brad is swimming in the ocean on a hot sunny day. He finds the water to be much colder than the sand on the beach, but even though the sun is warming them both. Identify the reasons for brads observation.
Answer:
The first one is energy.
The second one is specific heat.
Explanation:
Platos answer
How is a substance's structure and function affected by the attractive and repulsive forces of its molecules
a substance's physical properties are highly dependent upon the attractive and repulsive forces of its molecules.
A substance having strong inter molecular force of attraction will be solid, have high strength, fixed shape and volume. High melting point.
A substance having moderate intermolcualr force of attractions will be liquid, will be able to flow, have no fixed shape but have fixed volume.
A substance having weak intermolecular forces of attractions will be gas, will be able to flow, no fixed shape and no fixed volume.
Also the properties like viscosity, surface tension , vapour pressure, boiling point, melting point all the properties depends upon the intermoleuclar force of attractions.