The shapes are placed in a basket
What is the probability of choosing a triangle?
A 12/12
B 2/12
C 3/12
D 4/12

Answer:

D

Explanation:

the stuff being dissolved when making a solution

it is dissolved in the solvent

Answer:

Explanation:

but what is it.

Answer:

Below.

Explanation:

Magnesium hydroxide + Hydrogen Sulphate -->    Magnesium Sulphate + Water

The balanced equation:

Mg(OH)2 + H2SO4 ---> MgSO4 + 2H2O

  I think the answer is it turnes into a gas. Hope it helps! :) Asnwer is density.

A solid sample of oil is warmed until it turns into a liquid. Density is the  property of the oil will decrease.

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

As temperatures rose, the density of all oils decreased. The temperature coefficients of density change differed slightly between oils. The density differentials between oil and water, as well as their temperature coefficients, varied significantly between oils.

Oil is denser than alcohol but denser than water. Because the molecules that make up oil are larger than those that make up water, they cannot pack as tightly as water molecules can. They occupy more space per unit area and have a lower density.

Thus, Density is the  property of the oil will decrease.

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Answer:

value of x is -4 to solve 8=2×+4

Answer:

x=-4

Explanation:

just took test

Answer:

Many stars and distant galaxies move at varying speeds compared to each other.

Explanation:

All statements are contradictory, so play it safe and declare different energy levels.

Answer:

I think the answer is A) More distant galaxies are hotter than nearby stars

Explanation:

Hope this helps :)

Answer:

iron (Fe)

Explanation:

Since an atom is electrically neutral, so the atom has 26 electrons also. Ion has 24 electrons, so it has experienced loss of 2 electrons. So, charge on ion is +2. Also, the element with 26 protons (26 atomic number) is iron (Fe).

Answer:

6 CO2 + 6H2O produces 1 C6H12O6 + 6O2

Explanation:

Answer: 9.5

Explanation:

The moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.

It is defined as moles of solute in certain volume of Solvent.

The units of Molarity is mol/L or Molar(M)

Molarity = moles of solute /  Volume of Solvent

It is given that a 2.5 L , 3.8 M solution

Let n be the number of moles needed

M = n/V

Substituting the values in the equation

3.8 =  n /2.5

n = 3.8 * 2.5

n = 9.5 moles

Therefore the moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.

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Answer: True

Explanation:

Land surfaces absorb much more solar radiation than water. This is due to the fact that most land surfaces are darker than water which of course means more absorption of solar radiation and heat.

Answer:

d. less energy required

Explanation:

it said it in my book and i took the edg quiz

Answer: By going solar, you can reduce demand for fossil fuels, limit greenhouse gas emissions, and shrink your carbon footprint

Explanation:

Answer:

A

it on the explanation for ms yoder

Answer:

[tex]\large \boxed{\text{5.40 mol}}[/tex]

Explanation:

[tex]\text{Moles of water} = 3.25 \times 10^{24}\text{ molecules} \times \dfrac{\text{1 mol }}{6.022 \times\ 10^{23} \text{molecules}} = \textbf{5.40 mol}[/tex]

Answer:

Explanation:

it is important for cattle ranchers to understand the basics of chemistry because feeding and health of their valuable animals rely in the principles of chemical science.

Understanding what elements or compounds animal food must contain for the animals grow better is an esential part of animal husbandry.

The same can be said about the vitamins, drugs, antibiotics, and medicines in general, needed by the livestock to be healthy and cure diseases.

Chemistry involves the study of the substances, their propeties, and how to combine them (chemical reactions) which is the basis of the nutritrion and medicine; two essential parts of cattle breeding.

Answer:

[tex]\large \boxed{\text{0.2797 mol}}[/tex]

Explanation:

We must do the conversions:

mass of CaCO₃ ⟶ moles of CaCO₃ ⟶ moles of CaCl₂

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:     100.09                  110.98

         CaCO₃ + 2HCl ⟶ CaCl₂ + CO₂ + 2HCl

m/g:     27.9

(a) Moles of CaCO₃[tex]\text{Moles of CaCO}_{3} = \text{27.9 g CaCO}_{3}\times \dfrac{\text{1 mol CaCO}_{3}}{\text{100.09 g CaCO}_{3}}= \text{0.2787 mol CaCO}_{3}[/tex]

(b) Moles of CaCl₂[tex]\text{Moles of CaCl}_{2} =\text{0.2787 mol CaCO}_{3} \times \dfrac{\text{1mol CaCl}_{2}}{\text{1 mol CaCO}_{3}} = \text{0.279 mol CaCl}_{2}[/tex][tex]\text{The reaction produces $\large \boxed{\textbf{0.279 mol}}$ of CaCl}_{2}[/tex]

Answer:

12H2O   +   8As   =   3H2AsO4-    +    5AsH3   +  3H+

Explanation:

- This is balanced in an acidic solution and should be correct.

The oxygen atom has a partial negative charge and the Hydrogen atoms have a partial positive charge

The O2 atoms have a covalent bonding and are attracted to the electrons more strongly.  

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Answer:

What reaction is balanced

Final answer:

The balanced complete ionic equation for the reaction between Na₂CO₃ and AgNO₃ in aqueous solution is 2Na+ + 2NO₃- + CO₃²- + 2Ag+ → 2Na+ + 2NO₃- + Ag₂CO₃. The sodium and nitrate ions can be eliminated from the equation since they appear unchanged on both sides. The net ionic equation is CO₃²- + 2Ag+ → Ag₂CO₃.

Explanation:

Balanced Complete Ionic Equation:

2Na+(aq) + 2NO3-(aq) + CO32-(aq) + 2Ag+(aq) → 2Na+(aq) + 2NO3-(aq) + Ag2CO3(s)

In this reaction, the sodium ion (Na+) and the nitrate ion (NO3-) appear unchanged on both sides of the equation, so they can be eliminated from the reaction.

Net ionic equation:

CO32-(aq) + 2Ag+(aq) → Ag2CO3(s)

Answer:

C. slightly basic

Explanation:

0-7 = acidic

7 = neutral

7-14 = basic

- Since the pH is just over 7, the answer would be slightly basic.

- Hope this helps! Please let me know if you need a further explanation.

The human blood having a pH between 7.35 and 7.45 simply means the blood is slightly basic.

The correct answer to the question is Option C. slightly basic.

The pH of a solution is simply a measure of the acidicity or alkalinity of the solution.

The pH scale ranging from 0 to 14 gives a discription of the acidicity or alkalinity of a solution as follow:

0 to 6 => acidic

7 => Neutral

8 to 14 => Basic

From the question given above,

The pH of the blood reads between 7.35 and 7.45.

This simply implies that the human blood is slightly basic as the pH reading of the blood is a little above the neutral mark (i.e 7) of the pH scale.

Therefore, Option C. slightly basic. gives the correct answer to the question.

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Answer:

The salt and water will pass through the filter paper while the large, undissolved pieces of sand will be trapped by the filter paper. The liquid that passes through the filter paper and is collected in the beaker is called the filtrate.

Explanation:

If you look on google it will give you the answer: Salt.

Answer : The volume of nitrogen gas equal to [tex]3.42\times 10^{22}[/tex] molecules of this substance is, 1.27 liters.

Explanation :

First we have to calculate the moles of nitrogen gas.

As, [tex]6.022\times 10^{23}[/tex] molecules present in 1 mole of nitrogen gas

So, [tex]3.42\times 10^{22}[/tex] molecules present in [tex]\frac{3.42\times 10^{22}}{6.022\times 10^{23}}=0.0568[/tex]mole of nitrogen gas

Now we have to calculate the volume of nitrogen gas.

As we know that, 1 mole of substance occupies 22.4 L volume of gas at STP.

As, 1 mole of nitrogen gas occupies 22.4 L volume of nitrogen gas

So, 0.0568 mole of nitrogen gas occupies [tex]0.0568\times 22.4=1.27L[/tex] volume of nitrogen gas

Therefore, the volume of nitrogen gas equal to [tex]3.42\times 10^{22}[/tex] molecules of this substance is, 1.27 liters.

Answer:

1.27

Explanation:

Answer:

They first appeared in the fossil record around 66 million years ago, soon after the Cretaceous–Paleogene extinction event that eliminated about three-quarters of plant and animal species on Earth, including most dinosaurs.

Explanation:

Answer:

A or b I learned this in history

Answer:

563.18 K

General Formulas and Concepts:

Gas Laws

Ideal Gas Law: PV = nRT

Explanation:

Step 1: Define

[Given] n = 0.600 mol N₂

[Given] P = 234 kPa

[Given] L = 12.0 L

[Given] R = 8.314 L · kPa · mol⁻¹ · K⁻¹

[Solve] T

Step 2: Solve for T

Topic: AP Chemistry

Unit: Gas Laws

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 7.475 moles are present in 4.5 x 10²⁴ atoms of oxygen.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically, the formula for the number of moles can be given as

number of mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

number of atoms of oxygen=4.5 x 10²⁴atoms

Substituting all the given values in the above equation, we get

number of atoms of oxygen=(4.5 x 10²⁴)/(6.02 x 10²³)

number of atoms of oxygen= 7.475 mole

Therefore, 7.475 moles are present in 4.5 x 10²⁴ atoms of oxygen.

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Answer:

 2.1 x 105 kPa

Explanation:

Answer:

2.1 x 105 kPa

Explanation:

just took a quiz got it right so good luck!! :)

The answer is C. Potassium and D. Lithium.

The correct answers to which elements have an oxidation number of 1 are C. Potassium and D. Lithium, as both are group 1 alkali metals that typically form ions with a +1 charge.

Both potassium and lithium belong to the group 1 elements of the periodic table, also known as the alkali metals. These metals typically have a +1 oxidation state when forming compounds. Potassium (K) for example, readily loses one electron to form a K+ ion, also known as a monovalent cation. Similarly, lithium (Li) will also lose one electron to form an oxidation state of +1.

Magnesium (Mg) and Calcium (Ca), on the other hand, form ions with a 2+ charge, indicating an oxidation state of +2. For instance, in [tex]MgCl_2[/tex], magnesium has an oxidation number of +2. Therefore, options A. Magnesium and B. Calcium do not have an oxidation number of 1 and are not correct answers to the question.