Pls help 7th grade science

Answer: the answer is a=10m/s^2 right

Explanation: it just make more since then the other answers .

Answer:

c 10

Explanation:

ape.x verified

Answer:

liquid state is an intermediate phase between solid and gas phase

Answer is A. H20

Answer:

H2O

Explanation:

As H2 is a gas, and the question asks for the liquid state, it'd be H2O.

.Answer:

.Marie Kondo

Answer:

Federal Government

Explanation:

:)))))))))

✌❤✌❤

Explanation:

element with atomic numbers 7 and 83 have 5 and 5 valence electrons

Answer:

True

Explanation:

All irreversible reactions go to completion because the process cannot proceed in the backward direction.

A reversible reaction is one that does not go into completion in one direction.

An irreversible direction completely uses up the reactants to form the products and goes into completion.

These reactions can only proceed in one direction and not both.

Answer:

its eathe a or c a 50/50 chance

Answer:

Explanation:

its B

(please mark as brainliest if it's correct)

Answer:

I think it might be:

NiO=2

CuO=4

BaO=2

Explanation:

Hope this helps.

Answer:

slow

Explanation:

             according to kinetic molecular theory,as the temperature decreases the kinetic energy of molecules decreases

Answer:

[tex]8.42\ \text{mL}[/tex]

Explanation:

When the endpoint is reached the millimoles of sodium acetate and HCl will be equal.

[tex]\text{Volume of sodium acetate}=25\ \text{mL}[/tex]

[tex]\text{Molarity of sodium acetate}=0.033M[/tex]

[tex]\text{Molarity of HCl}=0.098M[/tex]

[tex]\text{Millimoles of sodium acetate}=25\times 0.033=0.825\ \text{mmol}[/tex]

Let [tex]V=\text{Volume of HCl}[/tex]

[tex]\text{Millimoles of HCl}=0.098V[/tex]

At end point the millimoles will be equal to that of sodium acetate

[tex]0.825=0.098V\\\Rightarrow V=\dfrac{0.825}{0.098}\\\Rightarrow V=8.42\ \text{mL}[/tex]

The volume of HCl required is [tex]8.42\ \text{mL}[/tex].

The volume of HCl required to required to reach endpoint is 8.42 mL

From the question,

We are to determine the volume of HCl required to reach endpoint

First, we will write a balanced chemical equation for the reaction.

The balanced chemical equation for the reaction is

CH₃COONa + HCl → CH₃COOH + NaCl

This means

1 mole of sodium acetate is required to completely neutralize 1 mole of HCl

Now, we will determine the number of moles of sodium acetate present

Using the formula

Number of moles = Concentration × Volume

Concentration of sodium acetate = 0.033 M

Volume of sodium acetate = 25.00 mL = 0.025 L

∴ Number of moles of sodium acetate present = 0.033 × 0.025

Number of moles of sodium acetate present = 0.000825 mole

Now,

Since, 1 mole of sodium acetate is required to completely neutralize 1 mole of HCl

Then,

0.000825 mole of sodium acetate would be required to completely neutralize 0.000825 mole of HCl

∴ The number of moles of HCl needed is 0.000825 mole

Now, for the volume of 0.098 M HCl required to reach endpoint

Using the formula

[tex]Volume = \frac{Number\ of\ moles}{Concentration}[/tex]

∴ Volume of HCl required to required to reach endpoint = [tex]\frac{0.000825}{0.098}[/tex]

Volume of HCl required to required to reach endpoint = 0.008418367 L

Volume of HCl required to required to reach endpoint = 8.418367 mL

Volume of HCl required to required to reach endpoint ≅ 8.42 mL

Hence, the volume of HCl required to required to reach endpoint is 8.42 mL

Learn more here: https://brainly.com/question/9698827

The balanced coefficients in the reaction are now; 2, 3, 1, 3.

A balanced chemical reaction equation is one in which the number of atoms of each element on the right hand side of the reaction equation is equal to the number of atoms of the same element on the left hand side of the reaction equation.

For the reaction show, the balanced reaction equation is; 2Al(NO3)3 + 3Na2S → Al2S3 +3 Na(NO3). The balanced coefficients in the reaction are now; 2, 3, 1, 3.

Learn more about reaction equations: https://brainly.com/question/15939621

Answer:

Easy 46 million turkeys

Medium three days

Hard: 1934

Fun: The first President on record issuing a "pardon" to his turkey was Ronald Reagan.

Explanation:

hop tis helped

Answer:

Cobalt/Electron configuration

Explanation:

[Ar] 3d7 4s2

Cyclops are heterotrophic

Answer:

CH4 + 2 O2 → CO2 + 2 H2O

Explanation:

There are one mole of O2 on the left side and on the right side there are three moles of O2. And to fix it you would need to make it two moles of O2 to have four molecules of O2 on the left side. Then you would make two moles of H2O to have a total of four moles of O2 on the right. Therefore, CH4 + 2 O2 → CO2 + 2 H2O is the answer.

Answer:

1,2,1,2

Explanation:

hope this helped!

Answer:

I think it is chemical change

Explanation:

The halogen family and noble gases are similar in just one particular way, they are groups of non-metals. All members of these two groups are categorized as non-metals.

Here are some of the differences between them;

Answer:

Acid rain

Explanation:

The independent variable in the hypothesis statement is the acid rain. An independent variable is usually the cause in an experiment.

This variable give rises to the effects observed as the dependent variable.

In the presence of the acid rain, the fish population will increase.

The dependent variable is the fish population or number of fishes.

The independent variable is the acid rain as it is the cause of the effect observed on the fish population.

Answer:

If the pH of a solution is less than 7, the solution is called acidic; if the pH is about 7, the solution is neutral; if the pH is greater than 7, the solution is is called basic. In an acidic solution, then, the concentration of hydrogen ions is greater than the concentration of hydroxide ions.

Explanation:

Not sure about the context of the question, but you can check with a ph scale tester.

Answer:

2

Explanation:

Answer:

Protons

Explanation:

Electrons have a negative charge which are found in shells around the nucleus. The nucleus consists of protons and neutron and the neutron has a neutral charge.

Answer:

In the electrolysis of dilute sulfuric acid, which electrolysis in aqueous solution to form hydrogen ions, H⁺, and sulfur IV ions SO₄²⁻ in the presence of H⁺ and OH⁻ ions from the water molecules

At the anode

The anode, positive electrode, attracts the negative OH⁻ and SO₄²⁻ ions where the OH⁻ gives up electrons to form water molecules and oxygen as follows;

4OH⁻ → 2H₂O + O₂ + 4e⁻

At the cathode

The positive H⁺ ions from the water molecules and the acid are attracted to the cathode where they combine with 2 electrons to form hydrogen gas as follows;

2e⁻ + 2H⁺ → H₂ (gas)

Explanation:

Answer:C - 3.115 g

Explanation:Correct

Answer:

a and d

Explanation:

Answer:

31.3grams

Explanation:

The amount of a radioactive element that remains, N(t), can be calculated by using the formula;

N(t) = N(o) × 0.5^{t/t(1/2)}

Where;

N(t) = mass of substance remaining

N(o) = mass of original substance

t(1/2) = half-life of substance

t = time elapsed

From the provided information; N(t) = ?, N(o) = 250g, t(1/2) = 1599 years, t = 4797 years

N(t) = 250 × 0.5^{4797/1599}

N(t) = 250 × 0.5^(3)

N(t) = 250 × 0.125

N(t) = 31.25g

N(t) = 31.3grams

Answer:

beryllium has a higher ionization energy because its radius is smaller. boron has a higher ionization energy because its radius is smaller.

Answer:

3.1 moles of ammonia

18.67× 10²³ molecules

Mass = 52.7 g

Explanation:

Given data:

Number of atoms of hydrogen = 5.68×10²⁴ atoms

A) Number of molecules of ammonia = ?

Solution:

First of all we will calculate the number of moles of hydrogen.

1 mole = 6.022× 10²³ atoms

5.68×10²⁴ atoms × 1 mol / 6.022× 10²³ atoms

0.94×10¹ mol

9.4 moles of hydrogen

Moles of ammonia:

3 moles of hydrogen are present in one mole of ammonia.

9.4 moles of hydrogen = 1/3×9.4 =

3.1 moles of ammonia

Number of molecules of ammonia:

1 mole contain 6.022× 10²³ molecules.

3.1 mol × 6.022× 10²³ molecules / 1 mol

18.67× 10²³ molecules

c) Mass of sample = ?

Mass = number of moles × molar mass

Mass = 3.1 moles × 17 g/mol

Mass = 52.7 g

Answer:

weather

Explanation: